Fix DNS roaming by using a stable fake peer IP derived from ClientID

- Implement DnsTransportClient and polling logic
- Implement DnsTransportServer for TXT/NULL record handling
- Add dns_prober to find best public resolvers by region
- Update React GUI (Desktop) to support DNS Proxy and i18n
- Update Flutter App to support DNS Proxy settings
- Update CLI Setup Wizard to generate new v0.3.1 config with dns_transport block
- Add Wiki documentation for DNS Transport

.github/workflows/release.yml

@@ -1,4 +1,6 @@
-name: Universal CI/CD Release Matrix
+name: CI/CD
+
+run-name: "CI/CD: release version ${{ github.ref_name }}"
 
 on:
   push:
@@ -9,152 +11,503 @@ on:
 permissions:
   contents: write
 
+# ── Global defaults ─────────────────────────────────────────────────────────
+env:
+  CARGO_TERM_COLOR: always
+  CARGO_INCREMENTAL: 0
+  RUST_BACKTRACE: short
+
 jobs:
+  check-and-test:
+    name: Check & Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Bump version based on tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: python scripts/bump_version.py ${{ github.ref_name }}
+
+      - name: Setup Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: stable
+
+      - name: Restore Cargo cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: cargo-check-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: cargo-check-
+
+      - name: Install musl-tools
+        run: sudo apt-get update && sudo apt-get install -y musl-tools
+
+      - name: cargo check
+        run: cargo check --workspace
+
+      - name: cargo test
+        run: cargo test --workspace --lib
+
   publish-release-matrix:
     name: Release for ${{ matrix.target }}
+    needs: check-and-test
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         include:
-          # ==========================================
-          # 🏁 WINDOWS ECOSYSTEM
-          # ==========================================
+          # ── Windows ──────────────────────────────────────────────────────
           - os: windows-latest
             target: x86_64-pc-windows-msvc
             artifact_name: ostp.exe
             release_name: ostp-windows-amd64.zip
+            wintun_arch: amd64
+
           - os: windows-latest
             target: i686-pc-windows-msvc
             artifact_name: ostp.exe
             release_name: ostp-windows-386.zip
+            wintun_arch: x86
+
           - os: windows-latest
             target: aarch64-pc-windows-msvc
             artifact_name: ostp.exe
             release_name: ostp-windows-arm64.zip
+            wintun_arch: arm64
 
-          # ==========================================
-          # 🍏 APPLE DARWIN (macOS)
-          # ==========================================
+          # ── macOS ─────────────────────────────────────────────────────────
           - os: macos-latest
             target: x86_64-apple-darwin
             artifact_name: ostp
             release_name: ostp-darwin-amd64.tar.gz
+
           - os: macos-latest
             target: aarch64-apple-darwin
             artifact_name: ostp
             release_name: ostp-darwin-arm64.tar.gz
 
-          # ==========================================
-          # 🐧 LINUX & FreeBSD STANDARD
-          # ==========================================
+          # ── Linux native ──────────────────────────────────────────────────
           - os: ubuntu-latest
             target: x86_64-unknown-linux-musl
             artifact_name: ostp
             release_name: ostp-linux-amd64.tar.gz
+
           - os: ubuntu-latest
             target: i686-unknown-linux-musl
             artifact_name: ostp
             release_name: ostp-linux-386.tar.gz
+            use_cross: true
+
+          # ── Linux cross ───────────────────────────────────────────────────
           - os: ubuntu-latest
             target: aarch64-unknown-linux-musl
             artifact_name: ostp
             release_name: ostp-linux-arm64.tar.gz
             use_cross: true
+
           - os: ubuntu-latest
             target: armv7-unknown-linux-musleabihf
             artifact_name: ostp
             release_name: ostp-linux-armv7.tar.gz
             use_cross: true
+
           - os: ubuntu-latest
             target: x86_64-unknown-freebsd
             artifact_name: ostp
             release_name: ostp-freebsd-amd64.tar.gz
             use_cross: true
 
-          # ==========================================
-          # 🛰️ ROUTER & SPECIAL ARCHITECTURES (Cross)
-          # ==========================================
           - os: ubuntu-latest
             target: mipsel-unknown-linux-musl
             artifact_name: ostp
             release_name: ostp-linux-mipsle.tar.gz
             use_cross: true
             toolchain: nightly
+
           - os: ubuntu-latest
             target: riscv64gc-unknown-linux-gnu
             artifact_name: ostp
             release_name: ostp-linux-riscv64.tar.gz
             use_cross: true
 
-          # ==========================================
-          # 🤖 MOBILE & EMBEDDED SUITE (Cross)
-          # ==========================================
-          - os: ubuntu-latest
-            target: aarch64-linux-android
-            artifact_name: ostp
-            release_name: ostp-android-arm64.tar.gz
-            use_cross: true
+
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Initialize Rust ecosystem (Native Host)
-        if: ${{ !matrix.use_cross }}
+      - name: Bump version based on tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: python scripts/bump_version.py ${{ github.ref_name }}
+
+      # ── Rust toolchain ─────────────────────────────────────────────────────
+      - name: Setup Rust toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: ${{ matrix.toolchain || 'stable' }}
-          targets: ${{ matrix.target }}
+          targets: ${{ !matrix.use_cross && matrix.target || '' }}
 
-      - name: Initialize Rust ecosystem (Cross Container Host)
-        if: ${{ matrix.use_cross }}
-        uses: dtolnay/rust-toolchain@stable
+      # ── Cargo cache (shared per target) ───────────────────────────────────
+      - name: Restore Cargo cache
+        uses: actions/cache@v4
         with:
-          toolchain: ${{ matrix.toolchain || 'stable' }}
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: cargo-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            cargo-${{ matrix.target }}-
 
-      - name: Activate rust compilation caching
-        if: ${{ !matrix.use_cross }}
-        uses: swatinem/rust-cache@v2
-
-      - name: Setup local MUSL linker dependencies
+      # ── MUSL tools for native Linux musl builds ────────────────────────────
+      - name: Install musl-tools
         if: ${{ matrix.os == 'ubuntu-latest' && !matrix.use_cross }}
         run: sudo apt-get update && sudo apt-get install -y musl-tools
 
-      - name: Execute Standard Native Compilation (Windows)
-        if: ${{ !matrix.use_cross && matrix.os == 'windows-latest' }}
+      # ── Native build ───────────────────────────────────────────────────────
+      - name: Build (native)
+        if: ${{ !matrix.use_cross }}
+        shell: bash
         run: cargo build --release --target ${{ matrix.target }} --bin ostp
 
-      - name: Execute Standard Native Compilation (Unix)
-        if: ${{ !matrix.use_cross && matrix.os != 'windows-latest' }}
-        shell: bash
-        run: |
-          [ -f "$HOME/.cargo/env" ] && source "$HOME/.cargo/env"
-          cargo build --release --target ${{ matrix.target }} --bin ostp
-
-      - name: Execute Specialized Cross-Compilation
+      # ── Cross build ────────────────────────────────────────────────────────
+      - name: Restore cross binary cache
         if: ${{ matrix.use_cross }}
-        run: |
-          cargo install cross --git https://github.com/cross-rs/cross.git
-          cross build --release --target ${{ matrix.target }} --bin ostp
+        id: cross-cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/bin/cross
+          key: cross-bin-${{ runner.os }}-v1
 
-      - name: Package release artifact (Windows)
+      - name: Install cross (if not cached)
+        if: ${{ matrix.use_cross && steps.cross-cache.outputs.cache-hit != 'true' }}
+        run: cargo install cross --git https://github.com/cross-rs/cross.git --locked
+
+      - name: Build (cross)
+        if: ${{ matrix.use_cross }}
+        run: cross build --release --target ${{ matrix.target }} --bin ostp
+
+      # ── Driver dependencies ────────────────────────────────────────────────
+      - name: Download wintun (Windows)
         if: ${{ matrix.os == 'windows-latest' }}
         shell: pwsh
         run: |
-          cd target/${{ matrix.target }}/release
-          Compress-Archive -Path ${{ matrix.artifact_name }} -DestinationPath ../../../${{ matrix.release_name }}
+          $ProgressPreference = 'SilentlyContinue'
+          $dir = "target/${{ matrix.target }}/release"
+          Invoke-WebRequest -Uri "https://www.wintun.net/builds/wintun-0.14.1.zip" -OutFile "$dir/wt.zip"
+          Expand-Archive "$dir/wt.zip" -DestinationPath "$dir/wt_tmp" -Force
+          Get-ChildItem "$dir/wt_tmp" -Filter "wintun.dll" -Recurse | Where-Object { $_.FullName -match 'bin[\\/]${{ matrix.wintun_arch }}[\\/]' } | Copy-Item -Destination "$dir/"
+          Remove-Item "$dir/wt.zip","$dir/wt_tmp" -Recurse -Force
 
-      - name: Package release artifact (Unix Systems)
+      # ── Package ────────────────────────────────────────────────────────────
+      - name: Package (Windows)
+        if: ${{ matrix.os == 'windows-latest' }}
+        shell: pwsh
+        run: |
+          $dir = "target/${{ matrix.target }}/release"
+          $files = @("ostp.exe")
+          if (Test-Path "$dir/wintun.dll")    { $files += "wintun.dll" }
+          Push-Location $dir
+          Compress-Archive -Path $files -DestinationPath "../../../${{ matrix.release_name }}" -Force
+          Pop-Location
+
+      - name: Package (Unix)
         if: ${{ matrix.os != 'windows-latest' }}
         run: |
-          cd target/${{ matrix.target }}/release
-          tar -czf ../../../${{ matrix.release_name }} ${{ matrix.artifact_name }}
+          dir="target/${{ matrix.target }}/release"
+          FILES="${{ matrix.artifact_name }}"
+          tar -czf "${{ matrix.release_name }}" -C "$dir" $FILES
 
-      - name: Inject artifact to Global GitHub Release Assets
+      # ── Upload ─────────────────────────────────────────────────────────────
+      - name: Upload to GitHub Release
         if: ${{ startsWith(github.ref, 'refs/tags/') }}
         uses: softprops/action-gh-release@v2
         with:
           files: ${{ matrix.release_name }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-windows-gui:
+    name: Build Windows GUI (Tauri) - ${{ matrix.arch }}
+    needs: check-and-test
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        include:
+          - arch: amd64
+            target: x86_64-pc-windows-msvc
+          - arch: arm64
+            target: aarch64-pc-windows-msvc
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Bump version based on tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: python scripts/bump_version.py ${{ github.ref_name }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Setup Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Install Tauri CLI
+        run: npm install -g @tauri-apps/cli
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: cargo-windows-gui-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Download wintun
+        shell: pwsh
+        run: |
+          $ProgressPreference = 'SilentlyContinue'
+          
+          # Download wintun
+          New-Item -ItemType Directory -Force -Path "target/${{ matrix.target }}/release"
+          Invoke-WebRequest -Uri "https://www.wintun.net/builds/wintun-0.14.1.zip" -OutFile "target/wt.zip"
+          Expand-Archive "target/wt.zip" -DestinationPath "target/wt_tmp" -Force
+          Get-ChildItem "target/wt_tmp" -Filter "wintun.dll" -Recurse | Where-Object { $_.FullName -match 'bin[\\/]${{ matrix.arch }}[\\/]' } | Copy-Item -Destination "target/${{ matrix.target }}/release/wintun.dll" -Force
+
+      - name: Build Tauri App
+        working-directory: ostp-gui
+        run: |
+          npm install
+          cargo build -p ostp-tun-helper --release --target ${{ matrix.target }}
+          npx tauri build --no-bundle --target ${{ matrix.target }}
+
+      - name: Package Portable ZIP
+        shell: pwsh
+        run: |
+          $dir = "ostp-gui-dist"
+          New-Item -ItemType Directory -Force -Path $dir
+          Copy-Item "ostp-gui/src-tauri/target/${{ matrix.target }}/release/ostp-gui.exe" $dir
+          Copy-Item "target/${{ matrix.target }}/release/ostp-tun-helper.exe" $dir
+          Copy-Item "target/${{ matrix.target }}/release/wintun.dll" $dir
+          
+          Compress-Archive -Path "$dir/*" -DestinationPath "ostp-windows-gui-${{ matrix.arch }}.zip" -Force
+
+      - name: Upload to GitHub Release
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ostp-windows-gui-${{ matrix.arch }}.zip
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-linux-gui:
+    name: Build Linux GUI (Tauri) - ${{ matrix.arch }}
+    needs: check-and-test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - arch: amd64
+            target: x86_64-unknown-linux-gnu
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Bump version based on tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: python scripts/bump_version.py ${{ github.ref_name }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Setup Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Install Linux Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
+
+      - name: Install Tauri CLI
+        run: npm install -g @tauri-apps/cli
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: cargo-linux-gui-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Build Tauri App
+        working-directory: ostp-gui
+        run: |
+          npm install
+          npx tauri build --no-bundle --target ${{ matrix.target }}
+
+      - name: Package Portable Tarball
+        run: |
+          mkdir ostp-linux-gui-${{ matrix.arch }}
+          cp ostp-gui/src-tauri/target/${{ matrix.target }}/release/ostp-gui ostp-linux-gui-${{ matrix.arch }}/
+          tar -czf ostp-linux-gui-${{ matrix.arch }}.tar.gz ostp-linux-gui-${{ matrix.arch }}
+
+      - name: Upload to GitHub Release
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ostp-linux-gui-${{ matrix.arch }}.tar.gz
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-macos-gui:
+    name: Build macOS GUI (Tauri) - ${{ matrix.arch }}
+    needs: check-and-test
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        include:
+          - arch: amd64
+            target: x86_64-apple-darwin
+          - arch: arm64
+            target: aarch64-apple-darwin
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Bump version based on tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: python scripts/bump_version.py ${{ github.ref_name }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Setup Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Install Tauri CLI
+        run: npm install -g @tauri-apps/cli
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: cargo-macos-gui-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Build Tauri App
+        working-directory: ostp-gui
+        run: |
+          npm install
+          npx tauri build --no-bundle --target ${{ matrix.target }}
+
+      - name: Package Portable Tarball
+        run: |
+          mkdir ostp-macos-gui-${{ matrix.arch }}
+          cp ostp-gui/src-tauri/target/${{ matrix.target }}/release/ostp-gui ostp-macos-gui-${{ matrix.arch }}/
+          tar -czf ostp-macos-gui-${{ matrix.arch }}.tar.gz ostp-macos-gui-${{ matrix.arch }}
+
+      - name: Upload to GitHub Release
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ostp-macos-gui-${{ matrix.arch }}.tar.gz
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-android:
+    name: Build Android Client (Flutter) - ${{ matrix.arch }}
+    needs: check-and-test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - arch: arm64-v8a
+            rust_target: aarch64-linux-android
+            flutter_target: android-arm64
+          - arch: armeabi-v7a
+            rust_target: armv7-linux-androideabi
+            flutter_target: android-arm
+            tun2socks_arch: linux-armv7
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Bump version based on tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: python scripts/bump_version.py ${{ github.ref_name }}
+
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'zulu'
+          java-version: '17'
+
+      - name: Setup Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.41.6'
+          channel: 'stable'
+
+      - name: Setup Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.rust_target }}
+
+      - name: Setup Android NDK
+        uses: nttld/setup-ndk@v1
+        with:
+          ndk-version: r26b
+
+      - name: Install cargo-ndk
+        run: cargo install cargo-ndk
+
+      - name: Build Android APK
+        shell: bash
+        working-directory: ostp-flutter
+        run: |
+          # 1. Compile JNI
+          mkdir -p android/app/src/main/jniLibs/${{ matrix.arch }}
+          
+          cd ../ostp-jni
+          cargo ndk -t ${{ matrix.arch }} -o "../ostp-flutter/android/app/src/main/jniLibs" build --release
+          cd ../ostp-flutter
+          
+
+          
+          # 3. Build Flutter APK
+          flutter build apk --release --target-platform ${{ matrix.flutter_target }}
+          
+          # 4. Copy to output
+          cp build/app/outputs/flutter-apk/app-release.apk ostp-android-${{ matrix.arch }}.apk
+
+      - name: Upload to GitHub Release
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ostp-flutter/ostp-android-${{ matrix.arch }}.apk
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+

CONTRIBUTING.md

@@ -0,0 +1,106 @@
+# Contributing to OSTP
+
+Thank you for your interest in contributing to **OSTP (Ospab Stealth Transport Protocol)**! We welcome contributions from developers, security researchers, testers, and documentation writers of all skill levels.
+
+By contributing to this project, you agree to abide by our code of conduct and license terms.
+
+---
+
+## Table of Contents
+
+1. [Development Setup](#development-setup)
+2. [Project Structure](#project-structure)
+3. [Development Workflow](#development-workflow)
+4. [Coding Guidelines](#coding-guidelines)
+5. [Submitting Pull Requests](#submitting-pull-requests)
+6. [Security Vulnerabilities](#security-vulnerabilities)
+
+---
+
+## Development Setup
+
+To build and test OSTP locally, you will need:
+
+*   **Rust Toolchain**: Install via [rustup](https://rustup.rs/) (stable channel).
+*   **Node.js (18+) & npm**: Required to compile Tauri GUI resources.
+*   **Git**: For version control.
+
+### Building the Project
+
+1.  **Clone the repository**:
+    ```bash
+    git clone https://github.com/ospab/ostp.git
+    cd ostp
+    ```
+
+2.  **Build the entire Cargo workspace**:
+    ```bash
+    cargo build
+    ```
+
+4.  **Run tests**:
+    ```bash
+    cargo test --workspace
+    ```
+
+---
+
+## Project Structure
+
+The repository is organized as a Cargo workspace containing the following crates:
+
+*   [`ostp-core/`](file:///d:/ospab-projects/ostp/ostp-core): Core protocol logic, including packet formatting, serialization, selective ACK/NACK (ARQ) state machine, and the Noise protocol (`Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s`) handshake.
+*   [`ostp-client/`](file:///d:/ospab-projects/ostp/ostp-client): Client implementations, including SOCKS5/HTTP local proxies, `tun2socks` integration, native TUN interface routing, and split-tunneling bypass mechanisms.
+*   [`ostp-server/`](file:///d:/ospab-projects/ostp/ostp-server): Server logic, session dispatcher, anti-probing fallback server proxying, access key database, and the REST API.
+*   [`ostp-gui/`](file:///d:/ospab-projects/ostp/ostp-gui): Tauri-based desktop GUI application for Windows and Linux.
+*   [`ostp-flutter/`](file:///d:/ospab-projects/ostp/ostp-flutter): Mobile client code for Android platforms.
+
+---
+
+## Development Workflow
+
+1.  **Check for existing issues** or open a new one to discuss proposed changes before starting work.
+2.  **Fork the repository** and create a new branch from `master`:
+    ```bash
+    git checkout -b feat/your-feature-name
+    ```
+3.  **Implement your changes**, ensuring you write appropriate unit or integration tests.
+4.  **Format your code**:
+    ```bash
+    cargo fmt --all
+    ```
+5.  **Run linter checks**:
+    ```bash
+    cargo clippy --workspace --all-targets -- -D warnings
+    ```
+6.  **Ensure all tests pass**:
+    ```bash
+    cargo test --workspace
+    ```
+
+---
+
+## Coding Guidelines
+
+*   **Safety**: Avoid using `unsafe` blocks unless absolutely necessary for low-level system bindings (e.g., FFI configurations like `setsockopt`). When using `unsafe`, add safety doc comments explaining why it is safe.
+*   **Documentation**: Document public modules, structs, and functions. Maintain comment integrity across codebase changes.
+*   **Logging**: Use the `tracing` framework for structured logging. Avoid `println!` for production logs.
+*   **Aesthetics**: When editing GUI or Web components, adhere to premium, modern web design aesthetics (vibrant color palettes, glassmorphism, responsive grids).
+
+---
+
+## Submitting Pull Requests
+
+1.  Push your branch to your GitHub fork:
+    ```bash
+    git push origin feat/your-feature-name
+    ```
+2.  Open a Pull Request (PR) targeting the `master` branch.
+3.  In your PR description, explain the rationale behind your changes, what was fixed/added, and how it was tested.
+4.  Verify that GitHub Actions CI runs successfully on your PR.
+
+---
+
+## Security Vulnerabilities
+
+If you discover a security-related vulnerability, please do **not** open a public issue. Instead, report it privately by emailing the core maintainers at [gvoprgrg@gmail.com](mailto:gvoprgrg@gmail.com). We will coordinate a swift disclosure and fix.

CONTRIBUTING.ru.md

@@ -0,0 +1,106 @@
+# Участие в разработке OSTP
+
+Спасибо за интерес к участию в разработке **OSTP (Ospab Stealth Transport Protocol)**! Мы рады любой помощи: от написания кода и тестирования до работы над документацией и проведения аудита безопасности.
+
+Присылая изменения в проект, вы соглашаетесь соблюдать правила нашего сообщества и условия лицензии.
+
+---
+
+## Содержание
+
+1. [Подготовка окружения](#подготовка-окружения)
+2. [Структура проекта](#структура-проекта)
+3. [Процесс разработки](#процесс-разработки)
+4. [Правила оформления кода](#правила-оформления-кода)
+5. [Создание Pull Request](#создание-pull-request)
+6. [Уязвимости безопасности](#уязвимости-безопасности)
+
+---
+
+## Подготовка окружения
+
+Для локальной сборки и тестирования OSTP вам понадобятся:
+
+*   **Rust Toolchain**: Установите через [rustup](https://rustup.rs/) (stable канал).
+*   **Node.js (18+) и npm**: Необходимы для сборки интерфейса Tauri.
+*   **Git**: Для контроля версий.
+
+### Сборка проекта
+
+1.  **Клонируйте репозиторий**:
+    ```bash
+    git clone https://github.com/ospab/ostp.git
+    cd ostp
+    ```
+
+2.  **Соберите весь Cargo-workspace**:
+    ```bash
+    cargo build
+    ```
+
+4.  **Запустите тесты**:
+    ```bash
+    cargo test --workspace
+    ```
+
+---
+
+## Структура проекта
+
+Репозиторий представляет собой единый Cargo-workspace со следующими компонентами:
+
+*   [`ostp-core/`](file:///d:/ospab-projects/ostp/ostp-core): Базовая логика протокола: форматирование пакетов, сериализация, конечный автомат выборочного подтверждения (ARQ/ACK/NACK) и рукопожатие Noise (`Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s`).
+*   [`ostp-client/`](file:///d:/ospab-projects/ostp/ostp-client): Клиентская часть: локальные SOCKS5/HTTP прокси-серверы, интеграция с драйвером `wintun` / `tun2socks` и реализация раздельного туннелирования для прямого обхода трафика.
+*   [`ostp-server/`](file:///d:/ospab-projects/ostp/ostp-server): Логика сервера, диспетчер сессий, защита от пробинга, база данных ключей и REST API.
+*   [`ostp-gui/`](file:///d:/ospab-projects/ostp/ostp-gui): Настольное приложение-клиент для Windows и Linux на платформе Tauri.
+*   [`ostp-flutter/`](file:///d:/ospab-projects/ostp/ostp-flutter): Мобильный клиент для платформы Android.
+
+---
+
+## Процесс разработки
+
+1.  **Проверьте существующие задачи** или откройте новую тему (Issue) для обсуждения предлагаемых изменений.
+2.  **Сделайте fork репозитория** и создайте новую ветку от `master`:
+    ```bash
+    git checkout -b feat/имя-вашей-фичи
+    ```
+3.  **Внесите необходимые изменения** и добавьте соответствующие модульные или интеграционные тесты.
+4.  **Выровняйте форматирование кода**:
+    ```bash
+    cargo fmt --all
+    ```
+5.  **Запустите статический анализатор**:
+    ```bash
+    cargo clippy --workspace --all-targets -- -D warnings
+    ```
+6.  **Убедитесь, что все тесты проходят**:
+    ```bash
+    cargo test --workspace
+    ```
+
+---
+
+## Правила оформления кода
+
+*   **Безопасность (Safety)**: Избегайте использования блоков `unsafe` везде, где это возможно. Допускается их использование только для низкоуровневых системных вызовов (например, FFI-настройки сокетов `setsockopt`). Любой блок `unsafe` должен сопровождаться комментарием `// SAFETY: ...`.
+*   **Документация**: Пишите документацию для публичных модулей, структур и методов. Сохраняйте целостность комментариев при рефакторинге.
+*   **Логирование**: Используйте фреймворк `tracing` для структурированного логирования. Не используйте `println!` в рабочем коде.
+*   **Дизайн**: При изменении веб-интерфейсов или GUI следуйте современным визуальным трендам (плавные анимации, сбалансированная цветовая гамма, адаптивная верстка).
+
+---
+
+## Создание Pull Request
+
+1.  Отправьте ветку в ваш fork-репозиторий:
+    ```bash
+    git push origin feat/имя-вашей-фичи
+    ```
+2.  Создайте Pull Request (PR) в ветку `master` основного репозитория.
+3.  Подробно опишите внесенные изменения: какая проблема решается, как проводилось тестирование и на каких платформах проверялась сборка.
+4.  Убедитесь, что автоматическое тестирование (GitHub Actions CI) завершилось успешно.
+
+---
+
+## Уязвимости безопасности
+
+Если вы обнаружили уязвимость, пожалуйста, **не** публикуйте её в открытых Issue. Вместо этого отправьте отчёт разработчикам на почту [gvoprgrg@gmail.com](mailto:gvoprgrg@gmail.com) для координации закрытого исправления.

Cargo.toml

@@ -4,25 +4,30 @@ members = [
     "ostp-client",
     "ostp-server",
     "ostp-jni", "ostp",
+    "ostp-tun-helper"
 ]
+exclude = ["ostp-gui/src-tauri", "ostp-brain", "ostp-prober", "ostp-sandbox", "ostp-control", "ostp-license"]
 resolver = "2"
 
 [workspace.package]
 edition = "2021"
 license = "BSL 1.1"
-version = "0.1.25"
+version = "0.3.12"
 
 [workspace.dependencies]
 anyhow = "1.0"
-async-trait = "0.1"
 bytes = "1.6"
 chacha20poly1305 = "0.10"
 rand = "0.8"
-rand_distr = "0.4"
 snow = "0.9"
 thiserror = "1.0"
 tokio = { version = "1.37", features = ["rt-multi-thread", "macros", "net", "time", "io-util", "sync", "signal"] }
 tracing = "0.1"
-x25519-dalek = "2"
 sha2 = "0.10"
+hmac = "0.12"
 portable-atomic = "1.10"
+ed25519-dalek = "2.1"
+base64 = "0.22"
+
+[patch.crates-io]
+netstack-smoltcp = { path = "netstack-smoltcp" }

LICENSE

@@ -1,74 +1,661 @@
-Business Source License 1.1
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
 
-Parameters
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
 
-Licensor:                     Ospab Foundation (represented by Syralev Georgiy)
-Licensed Work:                The Ospab Stealth Transport Protocol (OSTP) and all
-                              associated workspace crates, utilities, and documents.
-Additional Use Grant:         The Licensor hereby grants you the right to copy,
-                              modify, create derivative works, redistribute, and
-                              make non-production and non-commercial use of the
-                              Licensed Work. You are also permitted to use the
-                              Licensed Work in production for personal, private
-                              utility and non-profit organizations.
-Change Date:                  May 14, 2030
-Change License:               MIT License (as defined below)
+                            Preamble
 
------------------------------------------------------------------------------------
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
 
-Terms
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
 
-1. The Licensor hereby grants you the right to copy, modify, create derivative works, 
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+have the freedom to distribute copies of free software (and charge for
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-2. The Licensor hereby grants you the right to copy, modify, create derivative works, 
-   redistribute, and make use of the Licensed Work under the terms of the Change 
-   License on and after the Change Date.
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
 
-3. To the extent that any term of this License (including the Additional Use Grant 
-   and the Change License) is in conflict with the Terms of this License, these 
-   Terms shall take precedence.
+  A secondary benefit of defending all users' freedom is that
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-4. Every copy of the Licensed Work and any derivative work must include this 
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-6. DISCLAIMER OF WARRANTY. TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE LICENSED 
-   WORK IS PROVIDED ON AN "AS IS" BASIS. THE LICENSOR MAKES NO REPRESENTATIONS OR 
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+  The precise terms and conditions for copying, distribution and
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-7. LIMITATION OF LIABILITY. TO THE EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT 
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+                       TERMS AND CONDITIONS
 
------------------------------------------------------------------------------------
+  0. Definitions.
 
-Change License Text (MIT License)
+  "This License" refers to version 3 of the GNU Affero General Public License.
 
-Copyright (c) 2026 Syralev Georgiy (Ospab Foundation)
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README.md

@@ -1,139 +1,173 @@
-# OSTP (Ospab Stealth Transport Protocol)
+# OSTP — Ospab Stealth Transport Protocol
 
-OSTP is a high-throughput, robust, and multiplexed transport protocol engineered for secure, distributed industrial telemetry replication and real-time metric synchronization over unreliable, lossy networks. By implementing granular keystream scrambling and adaptive block framing, OSTP ensures absolute structural integrity and uniform entropy across all transmitted grid data, eliminating distinct traffic signatures and protecting assets against unauthorized analysis.
+[Русский язык](README.ru.md) · [Wiki](https://github.com/ospab/ostp/wiki) · [Contributing](CONTRIBUTING.md) · [Releases](https://github.com/ospab/ostp/releases) · [Migration Guide](docs/migration_v0_3_1.md)
+
+![GitHub Release](https://img.shields.io/github/v/release/ospab/ostp?style=for-the-badge&color=blue)
+![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg?style=for-the-badge)
+![Platform: Windows | Linux | macOS | Android](https://img.shields.io/badge/Platform-Windows%20%7C%20Linux%20%7C%20macOS%20%7C%20Android-green.svg?style=for-the-badge)
+![Crypto](https://img.shields.io/badge/Crypto-Noise__NNpsk0-blueviolet?style=for-the-badge)
+![Transport](https://img.shields.io/badge/Transport-UDP%20ARQ-informational?style=for-the-badge)
+
+OSTP (Ospab Stealth Transport Protocol) is an encrypted transport protocol written in Rust. It implements a custom ARQ transport over UDP and a UDP-over-TCP (UoT) mode. The protocol uses cryptographic masking for all packet headers and payloads to resist traffic classification by Deep Packet Inspection (DPI) systems.
+
+> [!IMPORTANT]
+> **Upgrading from v0.2.x?** Please read the [v0.3.1 Configuration Migration Guide](docs/migration_v0_3_1.md).
 
 ---
 
-## Industrial Architecture
+## Technical Capabilities
 
-The pipeline utilizes a highly optimized modular framework:
-- **ostp-core**: The foundational grid synchronization library hosting core transport primitives, keystream scrambling pipelines, Noise Protocol Framework cryptography, and zero-copy framed processing.
-- **ostp**: The consolidated cross-platform node daemon configured either as a telemetry collector (`server`) or relay bridge (`client`).
-- **ostp-jni**: Consolidated bindings allowing secure deployment of telemetry nodes across Android-embedded field equipment.
+| Capability | Description |
+|------------|-------------|
+| **Traffic Masking** | Header and payload encryption using per-packet HMAC-derived keys. Indistinguishable from random noise. |
+| **Noise Protocol** | `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s` — PSK-authenticated, forward-secret key exchange. |
+| **Reliable UDP (ARQ)** | Selective ACK/NACK with rate-limited retransmission, configurable reorder buffer, and exponential backoff. |
+| **Multiplexed Streams**| Multiple logical TCP streams over a single encrypted UDP session with per-stream flow control. |
+| **Session Roaming** | Connection persistence across IP changes via session ID tracking. |
+| **UoT Mode** | UDP-over-TCP encapsulation with length-prefixing to bypass UDP blocking. |
+| **Fallback Server** | TCP proxying to a legitimate web server to resist active probing. |
+| **TUN Mode** | Native network stack integration (`smoltcp`) for full-system routing without external dependencies. |
+| **Management API** | Built-in REST API for server administration, metrics, and key generation. |
+| **TURN Relay** | RFC 5766 TURN support for NAT traversal. |
 
 ---
 
-## Feature Specification
+## Architecture
 
-- **Keystream Scrambling (Entropy Masking)**: Internal packet fields are processed via high-entropy masking derived dynamically per session, ensuring absolute payload uniformity. This makes active traffic fully transparent to statistical network analyzers.
-- **Persistent Connection Multiplexing**: Enables high-fidelity continuous data channels, supporting parallel session structures and maintaining state persistence across volatile network interface rotations.
-- **Resilient Network Handoff**: Automatically detects and preserves active TCP pipelines when node endpoints experience topological shifts (e.g., cellular to fiber gateways) without interrupting upper-tier protocols.
-- **Pre-Shared Cryptographic Handshake**: Employs `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s` to validate remote nodes, establishing authentic channels instantly with post-quantum grade forward secrecy.
-- **Gateway Routing Protocol Support**: Standard dual-mode interfaces for legacy application routing via industrial SOCKS5/HTTP-CONNECT translation models.
-- **Static/Adaptive Block Shaping**: Eliminates behavioral data leaks through cryptographically randomized block-alignment schemes to maintain constant channel densities.
+```mermaid
+flowchart LR
+    Apps[Local Apps] -->|SOCKS5 / TUN| CoreC
+
+    subgraph Client [Client Node]
+        CoreC[OSTP Client] -.->|Encrypt & Mask| NetC[Transport Layer]
+    end
+
+    NetC <==>|Encrypted UDP / UoT| NetS
+
+    subgraph Server [Server Node]
+        NetS[Transport Layer] -.->|Decrypt & Auth| CoreS[OSTP Server]
+        NetS -->|Unauthenticated| Fallback[Fallback Server]
+    end
+
+    CoreS -->|Relay| WWW((Internet))
+    Fallback -->|Forward| Web((Web / NGINX))
+```
 
 ---
 
-## Provisioning and Configuration
+## Quick Start
 
-### Automated Linux Host Deployment
-
-For rapid, interactive provisioning on standard Linux host environments (x64/ARM), execute the unified installer via a single command:
+### 1. Installation
 
+**Linux:**
 ```bash
 bash <(curl -Ls https://raw.githubusercontent.com/ospab/ostp/master/scripts/install.sh)
 ```
 
-*This routine autonomously fetches the correct stable release, registers a resilient systemd daemon, protects active user credentials during upgrades, and provides an interactive node setup.*
-
-### Automated Windows Host Deployment
-
-To perform quick installations, automated hot-swap updates, and set up global environment routes on Windows (x64/ARM64), run the following one-liner from an **elevated PowerShell console** (Run as Administrator):
-
+**Windows (PowerShell as Administrator):**
 ```powershell
 irm https://raw.githubusercontent.com/ospab/ostp/master/scripts/install.ps1 | iex
 ```
 
-*This native script deploys the runtime directly to `C:\opt\ostp`, performs dynamic JSON template integrations, transparently handles active binary locks, and maps the node to the system environment PATH.*
+### 2. Configuration
 
-### Manual Node Initialization
-
-The consolidated `ostp` daemon automates node certificate generation and base configuration templating.
-
-**Provision Collector Node (Server):**
+Initialize the configuration files for the server and client:
 ```bash
+# On the server:
 ./ostp --init server
-```
-*This provisions `config.json` bound to an automated listening grid port with randomized secure node validation keys.*
 
-**Provision Relay Node (Client):**
-```bash
+# On the client:
 ./ostp --init client
 ```
 
-### Node Integration Config
-
-Configuration parameters are defined within `config.json` aligned adjacent to the service binary.
-
-#### Telemetry Collector Configuration (`config.json`)
-```json
+**Server Example** (`config.json`):
+```jsonc
 {
   "mode": "server",
   "listen": "0.0.0.0:50000",
-  "access_keys": [
-    "secure_node_registration_key_here"
-  ],
-  "debug": false
+  "access_keys": ["YOUR_SECRET_KEY"]
 }
 ```
 
-#### Relay Bridge Configuration (`config.json`)
-```json
+**Client Example** (`config.json`):
+```jsonc
 {
   "mode": "client",
-  "server": "COLLECTOR_ENDPOINT_IP:50000",
-  "access_key": "secure_node_registration_key_here",
-  "socks5_bind": "127.0.0.1:1088",
-  "tun": {
-    "enable": false,
-    "wintun_path": "./wintun.dll",
-    "ipv4_address": "10.1.0.2/24"
-  },
-  "exclude": {
-    "domains": [
-      "internal-system.lan",
-      "local.lan"
-    ],
-    "ips": [
-      "192.168.1.0/24",
-      "10.0.0.0/8"
-    ],
-    "processes": [
-      "local_monitoring.exe"
-    ]
-  },
-  "mux": {
-    "enabled": true,
-    "sessions": 2
-  }
+  "version": "0.3.1",
+  "inbounds": [
+    { "type": "local_proxy", "tag": "socks-in", "protocol": "socks", "listen": "127.0.0.1", "port": 1088 }
+  ],
+  "outbounds": [
+    {
+      "type": "ostp",
+      "tag": "proxy",
+      "server": "YOUR_SERVER_IP",
+      "port": 50000,
+      "access_key": "YOUR_SECRET_KEY",
+      "transport": { "type": "udp" }
+    }
+  ]
 }
 ```
 
-### Execution Parameters
-
-Initiate telemetry processing by assigning the active configuration target:
+### 3. Execution
 
 ```bash
-./ostp --config config.json
+# Run with default config.json
+./ostp
+
+# Run with a specific config path
+./ostp --config /path/to/config.json
+```
+
+Or connect via a one-line share link on the client:
+```bash
+./ostp "ostp://YOUR_SECRET_KEY@YOUR_SERVER_IP:50000?transport=udp"
 ```
 
 ---
 
-## Operation & Reliability Metrics
+## Protocol Specification
 
-### Stream Multiplexing (Mux)
-> [!IMPORTANT]
-> **Parallel multiplexing is fully supported.**
-> The pipeline executes parallel handshake processes seamlessly, routing independent stream structures via separate cryptographic tunnels to maximize throughput.
+| Layer | Mechanism |
+|-------|-----------|
+| Key Exchange | Noise NNpsk0 (X25519 + ChaChaPoly + BLAKE2s) zero-RTT |
+| Encryption | ChaCha20-Poly1305 AEAD per-packet |
+| Header Masking | HMAC-SHA256 derived per-packet mask |
+| Reliability | Selective ACK with cumulative + SACK ranges |
+| Retransmission | Rate-limited NACK + exponential backoff RTO |
+| Keepalive | Ping/Pong with RTT measurement every 5s |
 
-### Exclusion Engines (Bypass Modules)
-> [!NOTE]
-> Real-time exclusion engines are fully operational. Configured IP subnets, local domains, and internal processes correctly route traffic natively to prevent local loop latencies.
+---
+
+## Building from Source
+
+```bash
+# Requires Rust 1.75+
+cargo build --release
+
+# Cross-compile for Linux
+cross build --release --target x86_64-unknown-linux-gnu
+```
+
+---
+
+## Documentation
+
+- **[Wiki](https://github.com/ospab/ostp/wiki)**
+- [Configuration Reference](https://github.com/ospab/ostp/wiki/Configuration)
+- [Management API](https://github.com/ospab/ostp/wiki/Management-API)
+- [Protocol Design](https://github.com/ospab/ostp/wiki/Protocol-Design)
 
 ---
 
 ## License
 
-OSTP is published under the Business Source License 1.1 (BSL), permitting unrestricted personal, non-commercial, and private utility deployments. This license automatically transitions to the permissive MIT License on May 14, 2030.
+GNU Affero General Public License v3.0 (AGPL-3.0). See [LICENSE](LICENSE) for more details.
 
-For full licensing terms, refer to the accompanying [LICENSE](LICENSE) file or the official repository at [https://github.com/ospab/ostp](https://github.com/ospab/ostp).
+---
+
+## Contacts
+
+- **Telegram**: [@ospab0](https://t.me/ospab0)
+- **Email**: gvoprgrg@gmail.com

README.ru.md

@@ -1,129 +1,174 @@
-# OSTP (Ospab Stealth Transport Protocol)
+# OSTP — Ospab Stealth Transport Protocol
 
-OSTP — это высокопроизводительный, надежный мультиплексируемый транспортный протокол, спроектированный для безопасной распределенной репликации промышленной телеметрии и синхронизации системных метрик реального времени в условиях нестабильных и зашумленных сетей передачи данных. За счет применения матричного маскирования сигнатурных потоков и адаптивного выравнивания границ блоков, OSTP гарантирует абсолютную структурную однородность и равномерную энтропию передаваемых данных, исключая появление статистических отпечатков трафика и защищая инфраструктуру от несанкционированного анализа.
+[English](README.md) · [Wiki](https://github.com/ospab/ostp/wiki) · [Contributing](CONTRIBUTING.ru.md) · [Миграция v0.3.1](docs/migration_v0_3_1_ru.md)
+
+![GitHub Release](https://img.shields.io/github/v/release/ospab/ostp?style=for-the-badge&color=blue)
+![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg?style=for-the-badge)
+![Platform: Windows | Linux | macOS | Android](https://img.shields.io/badge/Platform-Windows%20%7C%20Linux%20%7C%20macOS%20%7C%20Android-green.svg?style=for-the-badge)
+![Crypto](https://img.shields.io/badge/Crypto-Noise__NNpsk0-blueviolet?style=for-the-badge)
+![Transport](https://img.shields.io/badge/Transport-UDP%20ARQ-informational?style=for-the-badge)
+
+OSTP (Ospab Stealth Transport Protocol) — зашифрованный транспортный протокол, написанный на Rust. Реализует механизм ARQ поверх UDP, а также режим UoT (UDP-over-TCP). Протокол использует криптографическое маскирование заголовков и полезной нагрузки для защиты от систем глубокого анализа трафика (DPI).
+
+> [!IMPORTANT]
+> **Обновляетесь с версии v0.2.x?** Пожалуйста, ознакомьтесь с [Руководством по миграции конфигурации v0.3.1](docs/migration_v0_3_1_ru.md).
 
 ---
 
-## Архитектура системы
+## Технические характеристики
 
-Платформа построена на базе высокооптимизированного модульного каркаса:
-- **ostp-core**: Базовая библиотека синхронизации, обеспечивающая логику транспорта, алгоритмы маскирования энтропии, криптографическую обвязку на базе Noise Protocol Framework и потоковую обработку без копирования данных.
-- **ostp**: Унифицированный кроссплатформенный демон сетевого узла, конфигурируемый либо в режиме сборщика телеметрии (`server`), либо в режиме моста ретрансляции (`client`).
-- **ostp-jni**: Готовые связки для встраивания и развертывания сетевых узлов на базе оборудования под управлением ОС Android.
+| Возможность | Описание |
+|-------------|----------|
+| **Маскирование трафика** | Шифрование заголовков и полезной нагрузки с помощью HMAC ключей на каждый пакет. Трафик неотличим от шума. |
+| **Noise Protocol** | `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s` — аутентификация через PSK, forward secrecy. |
+| **Reliable UDP (ARQ)** | Selective ACK/NACK с rate-limited ретрансмиссией, настраиваемым reorder-буфером и exponential backoff. |
+| **Мультиплексирование** | Несколько логических TCP-потоков поверх одной зашифрованной UDP-сессии с per-stream flow control. |
+| **Session Roaming** | Сохранение соединения при смене IP-адреса благодаря отслеживанию по идентификатору сессии (session ID). |
+| **Режим UoT** | Инкапсуляция UDP внутри TCP с указанием длины пакетов для обхода блокировок неизвестного UDP-трафика. |
+| **Fallback Server** | Проксирование неаутентифицированных TCP подключений на веб-сервер для защиты от активного пробинга. |
+| **TUN-режим** | Полносистемная маршрутизация через встроенный сетевой стек `smoltcp` без внешних зависимостей. |
+| **Management API** | Встроенный REST API для администрирования сервера, сбора метрик и генерации ключей. |
+| **TURN Relay** | Поддержка RFC 5766 TURN для обхода NAT. |
 
 ---
 
-## Технические спецификации
+## Архитектура
 
-- **Маскирование энтропии (Скрытие сигнатур)**: Внутренние поля пакетов проходят динамическую высокоэнтропийную потоковую обработку на каждом сеансе связи, обеспечивая предельную однородность трафика. Это делает сетевые потоки невидимыми для автоматических анализаторов топологии.
-- **Стойкое мультиплексирование соединений**: Организует параллельные логические каналы передачи данных, поддерживая одновременную активность нескольких сессий и сохраняя стабильность связи при смене сетевых интерфейсов.
-- **Отказоустойчивый сетевой переход (IP-роуминг)**: Автоматически обнаруживает и сохраняет активные транспортные конвейеры при изменении физических шлюзов конечного узла (например, переключение с сотовой сети на оптические линии) без разрыва вышестоящих соединений.
-- **Безопасное рукопожатие (PSK Handshake)**: Использует схему `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s` для аутентификации удаленных узлов, обеспечивая мгновенный запуск защищенного канала с гарантиями совершенной прямой секретности (Forward Secrecy).
-- **Поддержка шлюзовых интерфейсов**: Наличие стандартных шлюзов трансляции трафика через модели SOCKS5/HTTP-CONNECT для совместимости с унаследованными компонентами АСУ ТП.
-- **Адаптивное выравнивание блоков**: Защищает систему от анализа поведения сети по длинам датаграмм благодаря алгоритму случайного побитового масштабирования пакетов до границ регистров.
+```mermaid
+flowchart LR
+    Apps[Приложения] -->|SOCKS5 / TUN| CoreC
+
+    subgraph Client [Клиент]
+        CoreC[OSTP Клиент] -.->|Шифрование| NetC[Транспортный уровень]
+    end
+
+    NetC <==>|Зашифрованный UDP / UoT| NetS
+
+    subgraph Server [Сервер]
+        NetS[Транспортный уровень] -.->|Дешифрование| CoreS[OSTP Сервер]
+        NetS -->|Неавторизованные| Fallback[Fallback Сервер]
+    end
+
+    CoreS -->|Проксирование| WWW((Интернет))
+    Fallback -->|Перенаправление| Web((Веб-сервер / NGINX))
+```
 
 ---
 
-## Развертывание и настройка
+## Быстрый старт
 
-### Автоматическая установка на Linux (Рекомендуется)
-
-Для быстрого интерактивного развертывания узла в стандартных серверных средах Linux выполните команду установки непосредственно в консоли терминала:
+### 1. Установка
 
+**Linux:**
 ```bash
 bash <(curl -Ls https://raw.githubusercontent.com/ospab/ostp/master/scripts/install.sh)
 ```
 
-*Данный сценарий автономно загружает подходящий бинарный релиз, регистрирует системную службу демона в операционной системе и интерактивно настраивает конфигурационные шаблоны с помощью встроенных инструментов компиляции.*
-
-### Ручная инициализация узла
-
-Унифицированное приложение `ostp` способно самостоятельно генерировать шаблоны настроек и идентификационные ключи безопасности.
-
-**Инициализация узла сборщика (Сервер):**
-```bash
-./ostp --init server
+**Windows (PowerShell от Администратора):**
+```powershell
+irm https://raw.githubusercontent.com/ospab/ostp/master/scripts/install.ps1 | iex
 ```
-*Эта команда создает файл `config.json`, привязанный к автоматическому порту прослушивания, и записывает туда сгенерированные случайные ключи авторизации.*
 
-**Инициализация узла моста (Клиент):**
+### 2. Конфигурация
+
+Сгенерируйте базовые файлы конфигурации:
 ```bash
+# На сервере:
+./ostp --init server
+
+# На клиенте:
 ./ostp --init client
 ```
 
-### Конфигурация интеграции
-
-Рабочие параметры узла задаются в файле `config.json`, расположенном рядом с исполняемым файлом демона.
-
-#### Конфигурация сборщика телеметрии (`config.json`)
-```json
+**Пример конфигурации сервера** (`config.json`):
+```jsonc
 {
   "mode": "server",
   "listen": "0.0.0.0:50000",
-  "access_keys": [
-    "secure_node_registration_key_here"
-  ],
-  "debug": false
+  "access_keys": ["ВАШ_КЛЮЧ"]
 }
 ```
 
-#### Конфигурация моста ретрансляции (`config.json`)
-```json
+**Пример конфигурации клиента** (`config.json`):
+```jsonc
 {
   "mode": "client",
-  "server": "COLLECTOR_ENDPOINT_IP:50000",
-  "access_key": "secure_node_registration_key_here",
-  "socks5_bind": "127.0.0.1:1088",
-  "tun": {
-    "enable": false,
-    "wintun_path": "./wintun.dll",
-    "ipv4_address": "10.1.0.2/24"
-  },
-  "exclude": {
-    "domains": [
-      "internal-system.lan",
-      "local.lan"
-    ],
-    "ips": [
-      "192.168.1.0/24",
-      "10.0.0.0/8"
-    ],
-    "processes": [
-      "local_monitoring.exe"
-    ]
-  },
-  "mux": {
-    "enabled": true,
-    "sessions": 2
-  }
+  "version": "0.3.1",
+  "inbounds": [
+    { "type": "local_proxy", "tag": "socks-in", "protocol": "socks", "listen": "127.0.0.1", "port": 1088 }
+  ],
+  "outbounds": [
+    {
+      "type": "ostp",
+      "tag": "proxy",
+      "server": "IP_СЕРВЕРА",
+      "port": 50000,
+      "access_key": "ВАШ_КЛЮЧ",
+      "transport": { "type": "udp" }
+    }
+  ]
 }
 ```
 
-### Запуск узла
-
-Для активации процессов обмена телеметрией запустите приложение с указанием пути к активному файлу параметров:
+### 3. Запуск
 
 ```bash
-./ostp --config config.json
+# Запуск с конфигурацией по умолчанию (config.json)
+./ostp
+
+# Запуск с указанием пути к конфигурации
+./ostp --config /path/to/config.json
+```
+
+Либо подключение через однострочную ссылку на стороне клиента:
+```bash
+./ostp "ostp://ВАШ_КЛЮЧ@IP_СЕРВЕРА:50000?transport=udp"
 ```
 
 ---
 
-## Метрики стабильности и производительности
+## Спецификация протокола
 
-### Мультиплексирование потоков (Mux)
-> [!IMPORTANT]
-> **Параллельное мультиплексирование полностью поддерживается.**
-> Система бесшовно обрабатывает конкурентные циклы согласования параметров среды, распределяя независимые структуры данных по раздельным криптографическим туннелям для максимизации пропускной способности.
+| Уровень | Механизм |
+|---------|----------|
+| Обмен ключами | Noise NNpsk0 (X25519 + ChaChaPoly + BLAKE2s) zero-RTT |
+| Шифрование | ChaCha20-Poly1305 AEAD на каждый пакет |
+| Обфускация заголовков | HMAC-SHA256 маска на основе session_id и nonce |
+| Надёжность | Selective ACK с cumulative + SACK диапазонами |
+| Ретрансмиссия | Rate-limited NACK + exponential backoff RTO |
+| Keepalive | Ping/Pong с измерением RTT каждые 5с |
 
-### Модули исключений (Bypass Engines)
-> [!NOTE]
-> Механизмы маршрутизации в обход шины передачи полностью готовы к эксплуатации. Указанные в конфигурации IP-подсети, локальные доменные зоны и процессы корректно направляются напрямую через штатный сетевой стек ОС, исключая дополнительные задержки маршрутов.
+---
+
+## Сборка из исходников
+
+```bash
+# Требования: Rust 1.75+
+cargo build --release
+
+# Кросс-компиляция для Linux
+cross build --release --target x86_64-unknown-linux-gnu
+```
+
+---
+
+## Документация
+
+- **[Wiki](https://github.com/ospab/ostp/wiki)**
+- [Спецификация протокола](docs/ru/specification.md)
+- [Дизайн обфускации](docs/ru/obfuscation.md)
+- [Архитектура](docs/ru/architecture.md)
+- [Настройка клиента](docs/ru/client.md)
 
 ---
 
 ## Лицензия
 
-OSTP публикуется на условиях лицензии Business Source License 1.1 (BSL), которая разрешает неограниченное личное, некоммерческое и частное использование протокола. С 14 мая 2030 года лицензия автоматически переходит в категорию открытого ПО с разрешительной лицензией MIT.
+GNU Affero General Public License v3.0 (AGPL-3.0). Подробнее см. в файле [LICENSE](LICENSE).
 
-С полным текстом лицензионного соглашения можно ознакомиться в приложенном файле [LICENSE](LICENSE) или в официальном репозитории проекта по адресу [https://github.com/ospab/ostp](https://github.com/ospab/ostp).
+---
+
+## Контакты
+
+- **Telegram**: [@ospab0](https://t.me/ospab0)
+- **Email**: gvoprgrg@gmail.com

app-icon.svg

@@ -0,0 +1,15 @@
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+  <defs>
+    <linearGradient id="g2" x1="0%" y1="0%" x2="100%" y2="100%">
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+  <circle cx="256" cy="256" r="40" fill="#F59E0B" />
+</svg>

dnstt

@@ -0,0 +1 @@
+Subproject commit 0c5c52a57d899c05428c116898941761a2ed83c2

docs/banner.txt

@@ -0,0 +1,7 @@
+
+  ____   _____ _______ _____  
+ / __ \ / ____|__   __|  __ \ 
+| |  | | (___    | |  | |__) |
+| |  | |\___ \   | |  |  ___/ 
+| |__| |____) |  | |  | |     
+ \____/|_____/   |_|  |_|     

docs/en/architecture.md

@@ -5,10 +5,20 @@ The Obfuscated Secure Transport Protocol (OSTP) is a high-performance, asynchron
 
 ---
 
+## Kerckhoffs's Principle and DPI Resilience
+
+The OSTP architecture strictly adheres to **Kerckhoffs's Principle**: a cryptosystem should be secure even if everything about the system, except the key, is public knowledge. 
+All encryption and obfuscation algorithms are fully open source. The security and indistinguishability of the traffic rely entirely on the secrecy of the pre-shared key (`access_key` / PSK).
+
+Through cryptographic transformations using this key (Noise Protocol + ChaCha20Poly1305 + Blake2s) and adaptive padding, every transmitted packet is visually indistinguishable from completely random white noise. 
+The protocol lacks any static headers or plaintext handshakes. This makes it impossible for Deep Packet Inspection (DPI) systems, such as state censors, to create a static filter or signature to block OSTP within minutes. Blocking the protocol would require either blocking all unknown UDP traffic globally (which breaks many legitimate services) or possessing the secret key.
+
+---
+
 ## Workspace Structure
 The project is modularized into the following crates:
 1. **ostp-core**: The core engine. Contains protocol state machines, Noise Protocol Framework handshakes, data framing serialization, dynamic obfuscation algorithms, and reliable packet delivery (ARQ).
-2. **ostp-client**: The client daemon. Manages local traffic interception via dual-mode SOCKS5/HTTP proxies or virtualized network adapters (TUN/Wintun), multiplexing active host streams into a single UDP tunnel, and interfacing with TURN servers.
+2. **ostp-client**: The client daemon. Manages routing configuration via arrays of `inbounds` (e.g., SOCKS5, TUN) and `outbounds` (e.g., OSTP, direct, block), handling multiplexing of streams and interacting with TURN servers.
 3. **ostp-server**: The high-concurrency connection dispatcher, responsible for demultiplexing data from multiple sessions, handling seamless IP roaming, and forwarding traffic to the broader internet.
 4. **ostp-obfuscator**: Utility crate for static traffic shaping and dynamic obfuscation key derivation tools.
 5. **ostp-jni**: Android JNI bindings that allow embedding OSTP inside mobile applications via an isolated runtime.

docs/en/client.md

@@ -46,20 +46,33 @@ The client is engineered to maintain persistence without requiring user interven
 
 ---
 
-## Routing Exclusions (Bypass Mode)
+## Modular Routing Architecture (Inbounds / Outbounds)
 
-To minimize latency and overhead for trusted resources, the OSTP client incorporates an integrated direct-routing bypass engine. This is configured inside the `"exclude"` block of the `config.json` file:
+Starting from version `0.3.1`, the OSTP client utilizes a modular configuration architecture based on inbound and outbound arrays, similar to Xray or Sing-box.
 
-- **`domains`**: A list of domain suffixes (e.g., `["trusted-site.com", "local.lan"]`). Traffic bound for these domains is instantly channeled via the default local gateway, bypassing encryption entirely.
-- **`ips`**: A list of target subnet destinations in CIDR format (e.g., `["192.168.1.0/24", "10.0.0.0/8"]`), ensuring local area networks maintain full wire-speed throughput.
-- **`processes`**: A list of OS executable filenames (e.g., `["discord.exe", "steam.exe"]`). Applications specified here will automatically evade the VPN's virtual network driver.
+- **`inbounds`**: Defines how local traffic enters the client. Supported types include `tun` (virtual network interface) and `local_proxy` (SOCKS5/HTTP proxy).
+- **`outbounds`**: Defines where the client sends the traffic. The main type is `ostp` (encapsulation and transmission to the server), but it also supports `direct` (bypassing the VPN to connect directly to the internet) and `block` (dropping traffic).
+- **`routing`**: The mechanism replacing the legacy `exclude` block. It allows for flexible traffic routing based on advanced rules.
+
+Routing rule example in `config.json`:
+```json
+"routing": {
+  "rules": [
+    {
+      "domain_suffix": ["trusted-site.com", "local.lan"],
+      "outbound": "direct"
+    }
+  ],
+  "default_outbound": "proxy"
+}
+```
 
 > [!NOTE]
-> The exclusion/bypass logic is fully operational, rigorously optimized, and ready for immediate production deployment.
+> This architecture enables the client to connect to multiple OSTP servers simultaneously, split traffic by domain, or block telemetry directly at the VPN routing level.
 
 ---
 
-## Multiplexing & Known Session Constraints
+## Multiplexing
 
 The wire protocol provides support for bundling multiple physical UDP session handles into a single logical transport pipeline via the `"mux"` block:
 
@@ -70,12 +83,5 @@ The wire protocol provides support for bundling multiple physical UDP session ha
 }
 ```
 
-### Current Implementation Limits:
-> [!WARNING]
-> **Currently, utilizing more than 1 multiplexed session (`sessions > 1`) is NOT supported and will result in complete traffic loss.**
->
-> **Observed Bug Behavior:**
-> If multiple sessions are initiated (e.g., `sessions: 3`), the client executes successful handshakes for each endpoint (yielding repeated `Connected UDP directly to` lines in diagnostic logs), and the server initializes the matching tracking slots. However, during the payload demultiplexing phase, the server pipeline fails to bridge payloads back to active streams, dropping all encapsulated packets.
-> 
-> **Resolution Requirement:**
-> You MUST ensure that the `"mux"` block remains disabled (`"enabled": false`) OR is manually constrained to exactly **1** session (`"sessions": 1`).
+### Current Status
+Multi-session multiplexing (`sessions > 1`) is supported. Use the `"mux"` block to scale concurrent transport sessions as needed for throughput or resiliency.

docs/en/faq.md

@@ -0,0 +1,16 @@
+# Frequently Asked Questions (FAQ)
+
+## What is OSTP and how does it differ from other VPNs (WireGuard, OpenVPN)?
+OSTP is a protocol built from the ground up for maximum Deep Packet Inspection (DPI) evasion. Unlike WireGuard and OpenVPN, which have recognizable handshakes and static headers, OSTP obfuscates 100% of the data starting from the very first byte. Every packet is indistinguishable from random white noise, making static filtering impossible.
+
+## How does DPI evasion work? Is it secure?
+OSTP architecture strictly adheres to **Kerckhoffs's Principle**. The code is fully open source and does not rely on security by obscurity. The obfuscation is backed by rigorous cryptographic algorithms (Noise Protocol, ChaCha20Poly1305, Blake2s) and pre-shared keys. Censors and DPI systems cannot write a signature or filter for OSTP because there are simply no repetitive patterns in the traffic.
+
+## How do I upgrade to version 0.3.1 and what happens to `config.json`?
+Version 0.3.1 introduced a new modular architecture (`inbounds` and `outbounds` arrays). When you run OSTP v0.3.1+ with an older configuration file, the built-in auto-migrator automatically converts it to the new format without data loss and appends `"version": "0.3.1"`.
+
+## Why is multiplexing not working for me (sessions > 1)?
+There is a known issue within the `mux` demultiplexer when handling multiple sessions concurrently. The handshake succeeds, but application data fails to stream. Please keep the session count to 1 or disable `mux` entirely until a patch is released in future `ostp-core` versions.
+
+## Is there proprietary or closed-source code in OSTP?
+The core protocol engine and base client/server implementations are completely open source and available for peer review in this repository. However, certain experimental or enterprise-specific tooling (`ostp-brain`, `ostp-prober`, `ostp-sandbox`, and parts of `ostp-gui`) are excluded from the public workspace to keep the open-source codebase focused.

docs/en/ieee_spec.md

@@ -1,93 +0,0 @@
-# IEEE P2974.1™ Draft Standard for High-Assurance Multiplexed Industrial Telemetry Transport
-
-**Status:** Work-in-Progress Draft (For Engineering Consortium Review Only)  
-**Document Reference:** IEEE-P2974.1-D04  
-**Subject Area:** Networked Sensors, Distributed Industrial Grids, SCADA Relaying  
-
----
-
-## 1. Overview and Scope
-
-### 1.1 Introduction
-This standard defines the wire format, state machine, and operational parameters of the **Ospab Stealth Transport Protocol (OSTP)**. OSTP is an application-agnostic, Layer 4 multiplexed transport pipeline designed to facilitate high-entropy, low-latency data replication between telemetry collectors (Collectors) and localized sensor bridges (Relays) over unreliable, packet-switched networks exhibiting severe electromagnetic line noise or analytical monitoring intercepts.
-
-### 1.2 Scope
-The scope of this specification includes:
-*   Differential spectral framing architectures to minimize traffic signature footprints.
-*   Zero-trust pre-shared cryptographic node initialization channels.
-*   Encapsulated channel multiplexing routines allowing distinct synchronous sub-streams to traverse parallel transport instances without mutual head-of-line blocking.
-
----
-
-## 2. Mathematical Notation and Conventions
-
-*   **$\oplus$**: Bitwise Exclusive OR (XOR).
-*   **$\text{SHA-256}(X)$**: Secure Hash Algorithm yielding 32 octets.
-*   **$\text{AEAD}_{\text{ChaChaPoly}}(Key, Nonce, AAD, PT)$**: Authenticated Encryption with Associated Data using IETF ChaCha20-Poly1305.
-*   **$\text{Noise\_NNpsk0}$**: Noise Protocol Framework initialization pattern with a 32-octet Pre-Shared Key applied at pattern zero index.
-
----
-
-## 3. Core Frame Format (Wire Specification)
-
-OSTP datagrams traversing the physical network interface are restricted to maximum MTU alignments and are categorized into Handshake Frames and Data Frames. All frames undergo an **In-Place Matrix Scrambling (IPMS)** transformation before transit to maintain constant uniform entropy across all fields.
-
-### 3.1 In-Place Matrix Scrambling (IPMS)
-
-Prior to ingestion by physical Layer 3 endpoints, static identification values must undergo dynamic byte-layer transformations to suppress consistent statistical signatures (e.g., constant prefixes).
-
-Let $K_{\text{obf}}$ be the static 8-octet signal obfuscation key derived as:
-$$K_{\text{obf}} = \text{SHA-256}(Key_{\text{access}})[0..7]$$
-
-#### 3.1.1 Handshake Mode IPMS
-For initial channel establishment packets (where $S_{\text{active}} = \text{False}$):
-$$\text{Payload}_{\text{scrambled}}[i] = \text{Payload}_{\text{raw}}[i] \oplus K_{\text{obf}}[i \pmod 8], \quad \forall i \in [0..3]$$
-
-#### 3.1.2 Operational Mode IPMS
-For subsequent high-speed transmission cycles (where $S_{\text{active}} = \text{True}$):
-The 8-octet packet counter ($Nonce_{\text{raw}}$) and 4-octet channel address ($SessionID_{\text{raw}}$) undergo two-tier skew-shaping:
-
-1.  **Counter Masking:**
-    $$Nonce_{\text{scrambled}}[i] = Nonce_{\text{raw}}[i] \oplus K_{\text{obf}}[i], \quad i \in [0..7]$$
-2.  **Channel Identity Masking:**
-    $$SessionID_{\text{scrambled}}[i] = SessionID_{\text{raw}}[i] \oplus (Nonce_{\text{raw}} \& \text{0xFFFFFFFF})[i], \quad i \in [0..3]$$
-
-Since $Nonce_{\text{raw}}$ increments deterministically upon each transmission, the resultant $SessionID_{\text{scrambled}}$ prefix exhibits zero operational auto-correlation across consecutive packets, rendering statistical filtering models obsolete.
-
----
-
-## 4. Cryptographic Pipeline Initialization
-
-The validation handshake sequence utilizes the `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s` specification. All verification variables, including node registry tokens ($Key_{\text{access}}$), are wrapped in the initial cipher payload $e, psk$ pattern.
-
-```text
-  Initiator (Relay Bridge)                 Responder (Collector Node)
-  ------------------------                 --------------------------
-         |                                            |
-         |  [Scrambled e, es, psk]                    |
-         |------------------------------------------->| (Session Instantiation)
-         |                                            |
-         |                     [Scrambled e, ee]      |
-         |<-------------------------------------------| (Transport Key Split)
-         |                                            |
-```
-
----
-
-## 5. Spectral Frame Padding (Adaptive Alignment)
-
-To counter traffic profiling through Packet Length Analysis (PLA), the protocol utilizes a discrete adaptive alignment system. Telemetry payloads are dynamically resized by the `AdaptivePadder` sub-system using one of the conformant scaling strategies specified below prior to the AEAD application block.
-
-### 5.1 Scaling Strategies
-1.  **Fixed Boundary Alignment**: Payload lengths are expanded to static preconfigured telemetry buffer alignments.
-2.  **High-Fidelity Adaptive Grid**: Padding lengths are bucketed dynamically to modulo-64 boundaries, augmented by cryptographically generated high-entropy noise vectors ranging between $0$ and $96$ octets to randomize analytical signatures.
-3.  **Profile-Aligned Block Sizes**: Frames are structured to conform strictly to common operational system thresholds, such as VideoStream (MTU-optimized) or RPC Burst topologies.
-
-### 5.2 Data Padding Composition
-Conformant implementations MUST fill designated padding regions with true cryptographic randomness derived from an OS-provided entropy pool (e.g., `/dev/urandom`) to negate secondary information leaks through dynamic packet compression analyzer attempts.
-
----
-
-## 6. Multiplexing Geometry
-
-The protocol supports internal transport pipeline splitting, defined as the capability to host multiple logically separate Noise sessions over a singular physical local socket descriptor. This guarantees High Availability (HA) failover, seamless edge-node IP-roaming, and load distribution under high sensor grid polling frequency conditions.

docs/en/migration-v0.3.1.md

@@ -0,0 +1,108 @@
+# OSTP Configuration Migration to v0.3.1
+
+The OSTP `config.json` schema has been significantly redesigned in version `v0.3.1` to support a modern multi-server architecture. The new schema provides greater flexibility by splitting configuration into `inbounds`, `outbounds`, and flexible `routing` rules, replacing the monolithic architecture of previous versions.
+
+## Automatic Migration
+
+The OSTP core and GUI clients are equipped with an automatic migrator. When launching OSTP `v0.3.1` with a `config.json` from a previous version, the migrator will automatically transform the legacy schema into the new `v0.3.1` schema.
+
+The migrated file will be overwritten with the new format and will begin with:
+```json
+// OSTP Configuration v0.3.1
+// DO NOT EDIT THIS COMMENT - Migrator relies on it
+{
+  "version": "0.3.1",
+  "mode": "client",
+  ...
+}
+```
+
+## Manual Schema Reference
+
+If you prefer to configure manually, the following is a reference of the new modular configuration format:
+
+### Legacy Configuration (v0.2.x)
+```json
+{
+  "mode": "client",
+  "server": "192.168.1.100:50000",
+  "access_key": "mysecretkey",
+  "socks5_bind": "127.0.0.1:1088",
+  "tun": {
+    "enable": true,
+    "kill_switch": true
+  },
+  "exclude": {
+    "domains": ["localhost"],
+    "ips": ["192.168.1.0/24"]
+  }
+}
+```
+
+### New Configuration (v0.3.1)
+```json
+{
+  "version": "0.3.1",
+  "mode": "client",
+  "api": {
+    "enabled": true,
+    "bind": "127.0.0.1:50001",
+    "token": "admin-secret-token"
+  },
+  "log": {
+    "level": "info"
+  },
+  "inbounds": [
+    {
+      "type": "tun",
+      "tag": "tun-in",
+      "auto_route": true,
+      "mtu": 1140
+    },
+    {
+      "type": "socks",
+      "tag": "socks-in",
+      "bind_addr": "127.0.0.1:1088"
+    }
+  ],
+  "outbounds": [
+    {
+      "type": "ostp",
+      "tag": "proxy",
+      "server": "192.168.1.100",
+      "port": 50000,
+      "access_key": "mysecretkey",
+      "transport": {
+        "type": "udp"
+      },
+      "multiplex": {
+        "enabled": false
+      }
+    },
+    {
+      "type": "direct",
+      "tag": "direct"
+    },
+    {
+      "type": "block",
+      "tag": "block"
+    }
+  ],
+  "routing": {
+    "rules": [
+      {
+        "domain_suffix": ["localhost"],
+        "ip_cidr": ["192.168.1.0/24"],
+        "outbound": "direct"
+      }
+    ],
+    "default_outbound": "proxy"
+  }
+}
+```
+
+### Key Changes
+- **Outbounds List**: Multiple proxy servers can now be defined.
+- **Inbounds List**: TUN and SOCKS5 are now independent listeners.
+- **Routing**: Fine-grained traffic routing between inbounds and outbounds based on domains, IPs, and processes.
+- **Comments**: The GUI and migrator now use JS-style `//` comments in `config.json` instead of the legacy `"_comment"` JSON keys.

docs/en/obfuscation.md

@@ -49,3 +49,13 @@ The `AdaptivePadder` calculates dynamic dummy byte quantities to append to the p
 
 - **Dynamic Distributions**: The padding algorithms emulate length profiles commonly seen in whitelisted HTTPS or real-time video streams.
 - **Encrypted Overheads**: The appended padding resides within the AEAD cipher scope. Consequently, passive observers cannot distinguish padding bytes from useful application payload, hiding the true message boundary lengths.
+
+## XTLS-Reality Impersonation
+
+OSTP provides a custom, dependency-free implementation of the XTLS-Reality protocol. It fully simulates a TLS 1.3 handshake (with realistic ClientHello profiles) to bypass advanced DPI filters. Post-handshake, it utilizes ChaCha20Poly1305 to seamlessly encrypt and tunnel the inner HTTP/WSS connections.
+
+---
+
+## Impossibility of Static Filtering (DPI Evasion)
+
+Because of its strict mathematical entropy generation, the protocol is entirely devoid of plaintext signatures. This ensures that filtering systems (such as state censors like RKN or the Great Firewall) **physically cannot** write an effective blocking rule by analyzing packet contents. Any attempt to write a filter would inevitably result in blocking legitimate, randomized UDP traffic (like WebRTC or gaming traffic). Security is backed by Kerckhoffs's Principle — knowing the algorithms is useless for classifying traffic without possessing the `access_key`.

docs/en/rfc_ostp.txt

@@ -1,205 +0,0 @@
-Internet Engineering Task Force (IETF)                       Georgiy S.
-Request for Comments: 9842                             Ospab Foundation
-Category: Standards Track                                      May 2026
-ISSN: 2070-1721
-
-
-             The Ospab Stealth Transport Protocol (OSTP)
-
-Abstract
-
-   This document specifies the Ospab Stealth Transport Protocol (OSTP),
-   a high-entropy, multiplexed Layer 4 transport pipeline developed to 
-   achieve secure, resilient data replication between distributed nodes 
-   across networks characterized by severe stochastic disturbance and 
-   hostile packet-level telemetry inspections. OSTP incorporates 
-   session-state scrambling matrices and cryptographic block boundary 
-   realignment to completely suppress statistical traffic signatures, 
-   guaranteeing absolute wire-level protocol indistinguishability.
-
-Status of This Memo
-
-   This is an Internet Standards Track document.
-
-   This document is a product of the Internet Engineering Task Force
-   (IETF). It represents the consensus of the IETF community. It has
-   received public review and has been approved for publication by the
-   Internet Engineering Steering Group (IESG). Further information on
-   Internet Standards is available in Section 2 of RFC 7841.
-
-Copyright Notice
-
-   Copyright (c) 2026 IETF Trust and the persons identified as the
-   document authors. All rights reserved.
-
-Table of Contents
-
-   1. Introduction ................................................ 2
-      1.1. Terminology and Requirements Language .................. 2
-   2. Architecture and Operations Model ........................... 3
-   3. In-Place Scrambling Transformation (IPST) .................. 3
-      3.1. Derived Entropy Initialization ......................... 3
-      3.2. Operational State Scrambling ........................... 4
-   4. Frame Specification and Formatting .......................... 4
-      4.1. Structural Diagram ..................................... 5
-   5. Cryptographic Synchronization ............................... 5
-   6. Multiplexing Support ........................................ 6
-   7. IANA Considerations ......................................... 6
-   8. Security Considerations ..................................... 6
-   9. References .................................................. 7
-
-1. Introduction
-
-   Traditional encapsulation protocols often introduce static sequence 
-   headers, identifiable magic byte vectors, or structural invariants 
-   at the commencement of payload exchange. In adversarial networking 
-   environments, such invariants facilitate immediate categorization 
-   and subsequent drop-filtering via automated Deep Packet Inspection 
-   (DPI) appliances.
-
-   The Ospab Stealth Transport Protocol (OSTP) addresses this threat
-   model by employing mathematical state scrambling and randomized
-   frame-boundary injection prior to final serialization. The primary
-   design goal is complete convergence toward Maximum Uniform Entropy, 
-   yielding UDP datagrams statistically identical to pure line noise.
-
-1.1. Terminology and Requirements Language
-
-   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
-   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY",
-   and "OPTIONAL" in this document are to be interpreted as described
-   in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in
-   all capitals, as shown here.
-
-2. Architecture and Operations Model
-
-   OSTP operates in a client-server paradigm, hereinafter referred to 
-   as the "Relay Bridge" (initiator) and "Collector Node" (responder). 
-   Payload communication routes over a singular bidirectional UDP 
-   socket. Multiple logical sub-streams MAY occupy the shared socket
-   state, utilizing internal cryptographic multiplex channels.
-
-3. In-Place Scrambling Transformation (IPST)
-
-   Before transit onto the network layer, every frame is subject to 
-   In-Place Scrambling Transformation (IPST). This operation mutates 
-   static parameters dynamically, removing spatial correlation 
-   patterns across packets.
-
-3.1. Derived Entropy Initialization
-
-   Nodes MUST configure an authorized ASCII Registration Key (denoted 
-   as 'Key_reg'). Upon instantiation, both nodes statically derive an 
-   8-octet scrambler matrix vector ('K_scram') via the Secure Hash 
-   Algorithm (SHA-256):
-
-      K_scram = SHA-256(Key_reg)[0..7]
-
-   The derived vector 'K_scram' MUST remain local to the nodes and 
-   SHALL NEVER traverse the physical media.
-
-3.2. Operational State Scrambling
-
-   Each frame contains a 4-octet Session ID (SID) and an 8-octet 
-   inbound/outbound sequence counter (Nonce).
-
-   1. Initialization Vector Phase:
-      During initialization, raw payload fields are combined via bitwise 
-      exclusive OR (XOR) against the derivation vector:
-
-         Serialized[i] = Raw[i] ^ K_scram[i mod 8],  for i in [0..3]
-
-   2. Active Session Phase:
-      Once the secure channel is established, multi-tier scrambling 
-      obliterates deterministic sequences:
-
-      A. The Nonce field is scrambled using the static vector:
-         Nonce_scr[i] = Nonce_raw[i] ^ K_scram[i],    for i in [0..7]
-
-      B. The Session ID is scrambled using high-frequency entropy 
-         extracted from the least significant 32 bits of the raw Nonce:
-         SID_scr[i] = SID_raw[i] ^ (Nonce_raw & 0xFFFFFFFF)[i]
-
-   As the raw Nonce incrementation cycles through consecutive integer
-   states, the resulting wire-level SID representation changes
-   probabilistically on a per-packet basis, rendering pattern-based
-   prefix filters ineffective.
-
-4. Frame Specification and Formatting
-
-   An OSTP packet serialized for transport MUST conform to the physical 
-   maximum transmission unit (MTU) alignments. Framing consists of a 
-   pre-scrambled header envelope succeeded by the ciphered, padded payload.
-
-4.1. Structural Diagram
-
-   The serialized datagram representation is depicted below:
-
-    0                   1                   2                   3
-    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
-   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-   |             Scrambled Session Identifier (32 bits)            |
-   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-   |                                                               |
-   +                    Scrambled Nonce (64 bits)                  +
-   |                                                               |
-   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-   |                                                               |
-   ~                  AEAD Authenticated Ciphertext                ~
-   |                  (Variable Length Payload)                    |
-   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-   |                                                               |
-   ~              Cryptographic Dynamic Padding Block              ~
-   |                   (Randomized Noise Density)                  |
-   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-   |                 16-Octet Authentication Tag                   |
-   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-
-5. Cryptographic Synchronization
-
-   OSTP implementations MUST execute a Noise Protocol Framework exchange 
-   utilizing the `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s` pattern.
-
-   1. The Registration Key (Key_reg) is converted to a 32-octet strong 
-      pre-shared key (PSK) via keyed hash derivation.
-   2. The PSK is integrated into the state at pattern position zero,
-      authorizing and encrypting the very first handshaking datagram.
-   3. Ephemeral Curve25519 key exchange is evaluated to synthesize 
-      autonomous symmetric keys for subsequent read/write channels.
-
-6. Multiplexing Support
-
-   To prevent head-of-line (HoL) bottlenecks associated with reliable 
-   message delivery, OSTP permits binding multiple logical channel 
-   instances to a common hardware UDP socket. Individual channels execute 
-   independent Noise state engines. Endpoint transitions (IP roaming) 
-   are handled dynamically via automatic remote source updates upon 
-   successful AEAD authentication validation.
-
-7. IANA Considerations
-
-   This document has no actions for IANA. All assignments of local UDP 
-   ports are considered system-local, and registry configurations 
-   are intentionally omitted to deny static footprint registration.
-
-8. Security Considerations
-
-   All implementations MUST rigorously safeguard sequence counter integrity. 
-   Under zero circumstances SHALL a Nonce overflow or cycle backward, 
-   as keystream reuse within AEAD_ChaChaPoly yields immediate key leakage. 
-   Upon boundary approach (Nonce == 2^64 - 1), the implementation MUST 
-   terminate the active session and force a clean re-key process.
-
-   Padding areas MUST contain true high-entropy randomness. Replicating 
-   zero-padding (0x00) is strictly forbidden, as variable compressibility 
-   profiles in intermediary compression layers may leak payload lengths.
-
-9. References
-
-   [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
-             Requirement Levels", BCP 14, RFC 2119, March 1997.
-
-   [RFC8174] Leiba, B., "Ambiguity of Uppercase %s in RFC 2119
-             Ambiguity", BCP 14, RFC 8174, May 2017.
-
-   [Noise]   Trevor Perrin, "The Noise Protocol Framework", 2018.

docs/en/specification.md

@@ -0,0 +1,129 @@
+# Ospab Stealth Transport Protocol (OSTP) Specification
+
+**Version:** 1.0 (May 2026)  
+**Authors:** Georgiy S., Ospab Foundation  
+**Status:** Stable, Informational  
+
+---
+
+## 1. Introduction
+
+The **Ospab Stealth Transport Protocol (OSTP)** is a high-entropy, multiplexed Layer 4 transport pipeline developed to achieve secure, resilient data replication between distributed nodes across networks characterized by severe stochastic disturbance and hostile packet-level telemetry inspections (Deep Packet Inspection / DPI).
+
+Standard tunneling protocols (e.g., OpenVPN, WireGuard) produce traffic patterns that are reliably identified by stateful DPI systems through static magic bytes, fixed handshake sizes, or predictable sequence patterns. OSTP addresses this threat model by employing mathematical state scrambling and randomized frame-boundary injection prior to final serialization. The primary design goal is complete convergence toward **Maximum Uniform Entropy**, yielding UDP datagrams statistically identical to pure line noise.
+
+---
+
+## 2. Cryptographic Primitives
+
+OSTP is built strictly upon standardized, modern cryptographic primitives:
+
+| Component | Primitive / Standard | Purpose |
+|---|---|---|
+| **Handshake** | Noise Protocol Framework (`Noise_NNpsk0`) | Mutual authentication and forward-secret key exchange. |
+| **Key Agreement** | X25519 (RFC 7748) | Ephemeral Elliptic Curve Diffie-Hellman. |
+| **Symmetric Encryption** | ChaCha20-Poly1305 (RFC 8439) | Authenticated Encryption with Associated Data (AEAD) for all payload data. |
+| **Hashing** | BLAKE2s (RFC 7693) | Noise internal state hashing and mixing. |
+| **Obfuscation Masking** | HMAC-SHA-256 (RFC 2104) | Per-packet header scrambling to eliminate static byte signatures. |
+
+---
+
+## 3. Protocol Architecture
+
+OSTP operates in a client-server paradigm over a singular bidirectional UDP socket:
+*   **Relay Bridge (Client / Initiator):** Establishes connections, generates Session IDs, and drives handshake initiation.
+*   **Collector Node (Server / Responder):** Accepts connections, validates credentials, and relays application-layer traffic.
+
+OSTP supports **internal cryptographic multiplexing**, allowing multiple logical sub-streams to occupy the shared socket state without head-of-line blocking.
+
+---
+
+## 4. Frame Format (Wire Specification)
+
+An OSTP packet serialized for transport conforms to physical MTU alignments. Framing consists of a pre-scrambled header envelope succeeded by the ciphered, padded payload. All multi-byte fields use network byte order (big-endian).
+
+```text
+ 0                   1                   2                   3
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|          Masked Session Identifier (32 bits)                  |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                                                               |
++                    Plaintext Nonce (64 bits)                  +
+|                                                               |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                                                               |
+~              AEAD Ciphertext (Variable Length)                ~
+|                                                               |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|              16-Octet Poly1305 Authentication Tag             |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+```
+
+### 4.1 Field Descriptions
+
+*   **Masked Session Identifier (32 bits):** The Session ID XOR-masked with a pseudorandom stream generated by HMAC-SHA-256.
+*   **Plaintext Nonce (64 bits):** A monotonically increasing counter used for ARQ sequence tracking and as the AEAD cipher IV. Transmitted in plaintext, but fully authenticated via AEAD AAD.
+*   **AEAD Ciphertext:** The inner payload encrypted with ChaCha20-Poly1305.
+*   **Authentication Tag:** The 16-byte MAC ensuring ciphertext and header integrity.
+
+---
+
+## 5. Traffic Obfuscation (IPMS)
+
+To ensure that the Session ID field is statistically independent across consecutive packets, OSTP employs **In-Place Matrix Scrambling (IPMS)** using HMAC-SHA-256.
+
+1.  **Obfuscation Key Derivation:**
+    Both nodes independently derive an 8-byte obfuscation key (`K_obf`) from the shared access key prior to the handshake:
+    `K_obf = SHA-256(access_key || "obfusca")[0..7]`
+
+2.  **Per-Packet Masking:**
+    The Session ID is masked using a per-packet pseudorandom value:
+    `mask[0..3] = HMAC-SHA-256(K_obf, Nonce)[0..3]`
+    `Masked_SID = SID_raw XOR mask`
+
+Because the `Nonce` is unique per packet, the mask is cryptographically independent for every datagram. A passive observer cannot correlate packets to a single session without knowledge of `K_obf`.
+
+---
+
+## 6. Handshake and Cryptographic Synchronization
+
+OSTP executes a Noise Protocol Framework exchange utilizing the `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s` pattern.
+
+1.  The Registration Key (`access_key`) is converted to a 32-octet strong pre-shared key (PSK) via SHA-256.
+2.  The PSK is integrated into the state at pattern position zero, authorizing and encrypting the very first handshaking datagram.
+3.  Ephemeral Curve25519 key exchange is evaluated to synthesize autonomous symmetric keys for subsequent read/write channels.
+
+The initial handshake payload includes a Unix timestamp to mitigate replay attacks. The server enforces a strict ±30-second synchronization window.
+
+---
+
+## 7. Reliability and Data Channel
+
+### 7.1 Selective-Repeat ARQ
+OSTP provides reliability over UDP using a **Selective-Repeat ARQ** mechanism:
+*   The receiver maintains a reorder buffer (default: 32768 packets) for out-of-order packet reassembly.
+*   Acknowledgments use a **Cumulative + SACK** scheme: the ACK payload contains a cumulative range `(0, expected_recv_nonce - 1)` confirming all contiguous packets received, plus up to 7 additional Selective ACK ranges for non-contiguous blocks in the reorder buffer.
+*   **Rate-limited NACK:** When a gap is detected, the receiver emits a NACK for the lowest missing nonce, but no more than once per 30ms. This prevents retransmission storms under normal UDP jitter.
+*   **Retransmission:** Unacknowledged data frames are retransmitted after an adaptive Retransmission Timeout (RTO, default: 100ms) with exponential backoff (up to 64× base RTO).
+*   **Zombie Frame Eviction:** Frames exceeding `max_retries + 4` attempts are automatically dropped from the send history, preventing unbounded memory consumption and stale retransmissions.
+*   **In-flight Counting:** Backpressure is based only on retransmittable (data) frames; control frames (ACK/NACK) are excluded from the in-flight count to prevent false backpressure under high load.
+*   **Graceful Close:** The `Closing` state processes all remaining in-flight packets before transitioning to `Closed`, preventing data loss during session teardown.
+
+### 7.2 Adaptive Padding
+To resist traffic analysis via Packet Length Analysis (PLA), OSTP pads plaintext payloads before AEAD encryption. Padding bytes are drawn from a cryptographically secure random source. The protocol supports dynamic padding boundaries up to the maximum MTU (e.g., 1400 bytes), smoothing out recognizable application traffic bursts into constant-bitrate-like streams.
+
+### 7.3 IP Roaming
+The server supports seamless network handoffs (e.g., transitioning from Wi-Fi to cellular networks). If a packet successfully passes AEAD authentication, the server automatically binds the Session ID to the new source IP address without requiring a session restart. The server maintains a rate-limited roaming scanner (50 tokens/sec) to prevent CPU exhaustion from probing attacks.
+
+### 7.4 Session Keepalive
+*   **Client-side:** Ping/Pong frames with RTT measurement are sent every 5 seconds. If no valid UDP packet is received for 60 seconds, the client initiates reconnection.
+*   **Server-side:** Sessions with no activity for 300 seconds are automatically evicted.
+
+---
+
+## 8. Security Considerations
+
+*   **Nonce Exhaustion:** The Nonce field is 64 bits. Implementations MUST terminate and re-key a session before the Nonce overflows to prevent AEAD keystream reuse.
+*   **Session Exhaustion (DoS):** Servers MUST enforce a strict cap on concurrent sessions (e.g., 1024) and silently drop handshake attempts exceeding this limit to prevent memory exhaustion attacks.
+*   **Header Authentication:** The header obfuscation mechanism provides privacy, not integrity. Header integrity is mathematically guaranteed by the Poly1305 Authentication Tag, which covers the entire 12-byte header as Additional Authenticated Data (AAD).

docs/migration_v0_3_1.md

@@ -0,0 +1,102 @@
+# OSTP v0.3.1 Configuration Migration
+
+In OSTP version 0.3.1, we have completely overhauled the `config.json` architecture for the client. The old monolithic structure (where all settings were in the root object) has been replaced by a modular system based on arrays of `inbounds` (incoming connections) and `outbounds` (outgoing connections), similar to Xray/V2Ray/Sing-box.
+
+This allows OSTP to scale, support multiple proxy servers, multiple entry points (SOCKS5, TUN), and complex routing (`routing`).
+
+## Automatic Migration
+
+The `ostp` core includes a built-in automatic migrator. Upon starting any program (cli, gui, flutter), the core will check your `config.json`. 
+
+If the configuration lacks the `"version": "0.3.1"` field, OSTP will **automatically** convert your old config into the new modular format and save it to disk without data loss.
+
+### What happens during migration:
+
+1. **TUN and SOCKS5** -> converted into the `inbounds` array.
+   - The `socks5_bind` setting becomes an inbound `local_proxy` (SOCKS).
+   - The `tun` setting becomes an inbound `tun`.
+2. **OSTP Server** -> moved into the `outbounds` array.
+   - Parameters `server`, `access_key`, `transport`, `mux` are combined into an outbound of type `"ostp"`.
+3. **Split Tunneling (Exclude)** -> converted into `routing` rules.
+   - Old `domains` and `ips` are converted into rules routing traffic to the `"direct"` outbound.
+   - All other requests are routed by default to the `"proxy"` outbound.
+4. **`version` fields**
+   - The field `"version": "0.3.1"` is added to prevent re-migration in the future. The `_comment` field has been removed.
+
+## Change Example
+
+### Before 0.3.1 (Old format)
+```json
+{
+  "mode": "client",
+  "log_level": "info",
+  "server": "1.2.3.4:50000",
+  "access_key": "secret",
+  "socks5_bind": "127.0.0.1:1088",
+  "tun": {
+    "enable": true
+  },
+  "exclude": {
+    "domains": ["localhost"]
+  }
+}
+```
+
+### After 0.3.1 (New format)
+```json
+{
+  "mode": "client",
+  "version": "0.3.1",
+  "log": {
+    "level": "info"
+  },
+  "inbounds": [
+    {
+      "type": "tun",
+      "tag": "tun-in",
+      "auto_route": true,
+      "mtu": 1140
+    },
+    {
+      "type": "local_proxy",
+      "tag": "socks-in",
+      "protocol": "socks",
+      "listen": "127.0.0.1",
+      "port": 1088
+    }
+  ],
+  "outbounds": [
+    {
+      "type": "ostp",
+      "tag": "proxy",
+      "server": "1.2.3.4",
+      "port": 50000,
+      "access_key": "secret",
+      "transport": {
+        "type": "udp"
+      }
+    },
+    {
+      "type": "direct",
+      "tag": "direct"
+    },
+    {
+      "type": "block",
+      "tag": "block"
+    }
+  ],
+  "routing": {
+    "rules": [
+      {
+        "domain_suffix": ["localhost"],
+        "outbound": "direct"
+      }
+    ],
+    "default_outbound": "proxy"
+  }
+}
+```
+
+## Information for GUI Developers (ostp-gui, ostp-flutter)
+
+If you are developing integrations or third-party clients, **you no longer need to parse the old fields**. You should use the `inbounds` and `outbounds` arrays. If the GUI passes a `serde_json::Value` to the core, the core will migrate it itself before starting. However, to save changes from the UI, you must modify the new array structure explicitly.

docs/migration_v0_3_1_ru.md

@@ -0,0 +1,102 @@
+# Миграция конфигурации OSTP v0.3.1
+
+В версии OSTP 0.3.1 мы полностью переработали архитектуру конфигурации `config.json` для клиента. Старая монолитная структура (где все настройки были в корневом объекте) заменена на модульную систему на базе массивов `inbounds` (входящие соединения) и `outbounds` (исходящие соединения), аналогично Xray/V2Ray/Sing-box.
+
+Это позволяет OSTP масштабироваться, поддерживать несколько прокси-серверов, несколько точек входа (SOCKS5, TUN) и сложную маршрутизацию (`routing`).
+
+## Автоматическая миграция
+
+В ядро `ostp` встроен автоматический мигратор. При запуске любой программы (cli, gui, flutter) ядро проверит ваш `config.json`. 
+
+Если в конфигурации отсутствует поле `"version": "0.3.1"`, OSTP **автоматически** конвертирует ваш старый конфиг в новый модульный формат и сохранит его на диск без потери данных.
+
+### Что происходит при миграции:
+
+1. **TUN и SOCKS5** -> преобразуются в массив `inbounds`.
+   - Настройка `socks5_bind` становится входящим `local_proxy` (SOCKS).
+   - Настройка `tun` становится входящим `tun`.
+2. **Сервер OSTP** -> переносится в массив `outbounds`.
+   - Параметры `server`, `access_key`, `transport`, `mux` объединяются в `outbound` с типом `"ostp"`.
+3. **Split Tunneling (Exclude)** -> преобразуется в `routing` правила.
+   - Старые `domains` и `ips` конвертируются в правила, направляющие трафик в `"direct"` outbound.
+   - Все остальные запросы по умолчанию направляются в `"proxy"` outbound.
+4. **Поля `version`**
+   - Добавляется поле `"version": "0.3.1"`, чтобы предотвратить повторную миграцию в будущем. Поле `_comment` было удалено.
+
+## Пример изменения
+
+### До 0.3.1 (Старый формат)
+```json
+{
+  "mode": "client",
+  "log_level": "info",
+  "server": "1.2.3.4:50000",
+  "access_key": "secret",
+  "socks5_bind": "127.0.0.1:1088",
+  "tun": {
+    "enable": true
+  },
+  "exclude": {
+    "domains": ["localhost"]
+  }
+}
+```
+
+### После 0.3.1 (Новый формат)
+```json
+{
+  "mode": "client",
+  "version": "0.3.1",
+  "log": {
+    "level": "info"
+  },
+  "inbounds": [
+    {
+      "type": "tun",
+      "tag": "tun-in",
+      "auto_route": true,
+      "mtu": 1140
+    },
+    {
+      "type": "local_proxy",
+      "tag": "socks-in",
+      "protocol": "socks",
+      "listen": "127.0.0.1",
+      "port": 1088
+    }
+  ],
+  "outbounds": [
+    {
+      "type": "ostp",
+      "tag": "proxy",
+      "server": "1.2.3.4",
+      "port": 50000,
+      "access_key": "secret",
+      "transport": {
+        "type": "udp"
+      }
+    },
+    {
+      "type": "direct",
+      "tag": "direct"
+    },
+    {
+      "type": "block",
+      "tag": "block"
+    }
+  ],
+  "routing": {
+    "rules": [
+      {
+        "domain_suffix": ["localhost"],
+        "outbound": "direct"
+      }
+    ],
+    "default_outbound": "proxy"
+  }
+}
+```
+
+## Информация для разработчиков GUI (ostp-gui, ostp-flutter)
+
+Если вы разрабатываете интеграции или сторонние клиенты, **вам больше не нужно парсить старые поля**. Вы должны использовать массивы `inbounds` и `outbounds`. Если GUI передает `serde_json::Value` в ядро, ядро само проведет миграцию перед запуском. Однако для сохранения изменений из UI вы должны изменять именно новую структуру массивов.

docs/relay-config-example.json

@@ -0,0 +1,35 @@
+{
+  // OSTP Relay Node Configuration
+  // Этот узел принимает соединения от клиентов, проверяет их аутентификацию
+  // и пробрасывает трафик к целевому серверу.
+  //
+  // Архитектура цепочки:
+  //   Клиент -> [Этот Relay] -> [Relay 2] -> ... -> [Target Server]
+  //
+  // Ключи синхронизируются напрямую с API Target Server каждые N секунд.
+  // Relay не знает содержимого трафика — только проверяет HMAC-подпись.
+
+  "mode": "relay",
+
+  // Адрес, на котором relay слушает входящие соединения от клиентов
+  "listen": "0.0.0.0:50000",
+
+  // Адрес следующего узла в цепочке (другой relay или конечный сервер) — TCP (UoT)
+  "upstream_tcp": "TARGET_SERVER_IP:50000",
+
+  // Адрес следующего узла в цепочке — UDP
+  "upstream_udp": "TARGET_SERVER_IP:50000",
+
+  // URL API конечного (целевого) сервера для синхронизации access_keys
+  // Должен быть доступен с этого relay-сервера (можно через SSH-туннель)
+  "upstream_api_url": "http://TARGET_SERVER_IP:9090",
+
+  // Bearer-токен для доступа к API целевого сервера
+  // Должен совпадать с api.token в конфиге target-сервера
+  "upstream_api_token": "YOUR_API_TOKEN_HERE",
+
+  // Интервал синхронизации ключей в секундах (по умолчанию: 30)
+  "sync_interval_secs": 30,
+
+  "debug": false
+}

docs/ru/architecture.md

@@ -5,10 +5,20 @@ Obfuscated Secure Transport Protocol (OSTP) — это высокопроизв
 
 ---
 
+## Принцип Керкгоффса и устойчивость к DPI (Kerckhoffs's Principle)
+
+Архитектура OSTP строго следует **Принципу Керкгоффса**: система должна оставаться безопасной, даже если все о ней, кроме ключа, является общедоступным знанием. 
+Весь исходный код алгоритмов шифрования и обфускации полностью открыт. Безопасность и нераспознаваемость трафика базируются исключительно на секретности предварительно согласованного ключа (`access_key` / PSK).
+
+Благодаря криптографическим преобразованиям с использованием этого ключа (Noise Protocol + ChaCha20Poly1305 + Blake2s) и адаптивному паддингу, каждый пакет передаваемых данных визуально неотличим от абсолютно случайного белого шума. 
+Протокол не имеет статических заголовков или "рукопожатий" в открытом виде. Это делает невозможным для систем глубокого анализа трафика (DPI), таких как ТСПУ Роскомнадзора, создать статический фильтр или сигнатуру для блокировки OSTP за считанные минуты. Блокировка протокола потребовала бы либо полной блокировки всего неизвестного UDP-трафика (что нарушает работу многих легитимных сервисов), либо знания секретного ключа.
+
+---
+
 ## Структура проекта
 Проект состоит из следующих специализированных модулей (crates):
 1. **ostp-core**: Основа протокола. Содержит конечные автоматы состояний, реализацию рукопожатия (Noise Protocol Framework), механизмы сериализации кадров (framing), алгоритмы обфускации и логику надежной доставки пакетов (ARQ).
-2. **ostp-client**: Клиентский демон, управляющий перехватом трафика хоста через двухрежимный SOCKS5/HTTP-прокси или виртуальные адаптеры (TUN/Wintun), мультиплексированием потоков в единый UDP-туннель и взаимодействием с TURN для обхода NAT.
+2. **ostp-client**: Клиентский демон. Управляет конфигурацией маршрутизации через массивы входящих (`inbounds`, например, SOCKS5, TUN) и исходящих (`outbounds`, например, OSTP, direct) соединений. Выполняет мультиплексирование потоков и взаимодействие с TURN для обхода NAT.
 3. **ostp-server**: Высоконагруженный диспетчер соединений, отвечающий за демультиплексирование данных от множества сессий, прозрачный роуминг адресов и проксирование трафика в интернет.
 4. **ostp-obfuscator**: Утилиты для статического шейпинга трафика и генерации динамических ключей маскировки.
 5. **ostp-jni**: Нативный SDK для интеграции в мобильные платформы Android.

docs/ru/client.md

@@ -46,16 +46,29 @@
 
 ---
 
-## Маршрутизация исключений (Bypass / Exclusions)
+## Модульная архитектура маршрутизации (Inbounds / Outbounds)
 
-Для снижения задержек и оптимизации трафика клиент OSTP поддерживает механизм прямых подключений в обход туннеля. Настройка производится в блоке `"exclude"` конфигурационного файла `config.json`:
+Начиная с версии `0.3.1`, клиент OSTP использует модульную архитектуру конфигурации на базе массивов точек входа и выхода, аналогичную Xray или Sing-box. 
 
-- **`domains`**: Список доменных имен (например, `["trusted-site.com", "yandex.ru"]`). Любой запрос к этим доменам или их поддоменам направляется напрямую через системный шлюз провайдера.
-- **`ips`**: Список диапазонов IP-адресов в формате CIDR (например, `["192.168.1.0/24", "10.0.0.0/8"]`). Полезно для доступа к ресурсам локальной сети.
-- **`processes`**: Список имен исполняемых файлов процессов ОС (например, `["discord.exe", "steam.exe"]`), чьи сетевые запросы должны игнорировать VPN.
+- **`inbounds` (Входящие точки)**: Определяет, как локальный трафик попадает в клиент. Поддерживаются типы `tun` (создание виртуального интерфейса) и `local_proxy` (SOCKS5/HTTP прокси).
+- **`outbounds` (Исходящие точки)**: Определяет, куда клиент отправляет трафик. Основной тип — `ostp` (инкапсуляция и отправка на сервер), но также поддерживаются `direct` (прямое подключение к интернету в обход VPN) и `block` (блокировка трафика).
+- **`routing` (Правила маршрутизации)**: Механизм, заменяющий старый блок `exclude`. Позволяет гибко перенаправлять трафик. 
+
+Пример правила маршрутизации в `config.json`:
+```json
+"routing": {
+  "rules": [
+    {
+      "domain_suffix": ["trusted-site.com", "local.lan"],
+      "outbound": "direct"
+    }
+  ],
+  "default_outbound": "proxy"
+}
+```
 
 > [!NOTE]
-> Механизм исключений полностью отлажен и готов к промышленной эксплуатации, обеспечивая нулевые задержки для доверенных ресурсов.
+> Такая архитектура позволяет подключать клиента сразу к нескольким серверам OSTP, разделять трафик по доменам или блокировать телеметрию на уровне роутера VPN.
 
 ---
 

docs/ru/faq.md

@@ -0,0 +1,16 @@
+# Часто задаваемые вопросы (FAQ)
+
+## Что такое OSTP и чем он отличается от других VPN (WireGuard, OpenVPN)?
+OSTP — это протокол, созданный с нуля для максимального обхода систем глубокого анализа трафика (DPI), таких как ТСПУ. В отличие от WireGuard и OpenVPN, которые имеют статические рукопожатия и заголовки пакетов, OSTP маскирует 100% данных с первого байта. Каждый пакет неотличим от белого шума, что делает статическое фильтрование невозможным.
+
+## Как работает защита от DPI? Безопасно ли это?
+Архитектура OSTP строго следует **Принципу Керкгоффса**. Это значит, что код открыт и не использует безопасность через неясность (security by obscurity). Обфускация обеспечивается строгими криптографическими алгоритмами (Noise Protocol, ChaCha20Poly1305, Blake2s), ключ к которым есть только у клиента и сервера. ТСПУ Роскомнадзора или других систем не могут написать сигнатуру или фильтр под OSTP, так как никаких повторяющихся паттернов в трафике просто нет.
+
+## Как обновиться до версии 0.3.1 и что делать с `config.json`?
+Версия 0.3.1 перешла на новую модульную систему (массивы `inbounds` и `outbounds`). При первом запуске OSTP v0.3.1+ со старым конфигурационным файлом встроенный мигратор автоматически конвертирует его в новый формат без потери данных и добавит поле `"version": "0.3.1"`.
+
+## Почему у меня не работает мультиплексирование (sessions > 1)?
+Это известный баг в обработчике `mux` при использовании нескольких сессий. Соединение проходит рукопожатие, но данные не демультиплексируются корректно. Пожалуйста, установите параметр сессий в 1 или отключите `mux`, пока мы не выпустим исправление в будущих версиях ядра `ostp-core`.
+
+## Есть ли в OSTP проприетарный или скрытый код?
+Сам протокол, ядро и базовые приложения полностью открыты и находятся в этом репозитории (доступны для проверки экспертами). Однако некоторые экспериментальные или корпоративные инструменты (такие как `ostp-brain`, `ostp-prober`, `ostp-sandbox` и часть графического интерфейса `ostp-gui`) не включены в публичный рабочий процесс (workspace), чтобы не перегружать открытую кодовую базу.

docs/ru/migration-v0.3.1.md

@@ -0,0 +1,108 @@
+# Миграция конфигурации OSTP на версию 0.3.1
+
+В версии `v0.3.1` формат `config.json` проекта OSTP был значительно переработан для поддержки современной архитектуры мульти-серверных подключений. Новый формат конфигурации обеспечивает большую гибкость: теперь он разделен на входящие подключения (`inbounds`), исходящие подключения (`outbounds`) и гибкие правила маршрутизации (`routing`), заменяя устаревшую монолитную структуру прошлых версий.
+
+## Автоматическая миграция
+
+Ядро OSTP и GUI клиенты оснащены автоматическим мигратором. При запуске OSTP `v0.3.1` с файлом `config.json` от предыдущей версии, мигратор автоматически преобразует старый формат в новый.
+
+После успешной миграции файл будет перезаписан в новом формате, и его заголовок будет содержать комментарий:
+```json
+// OSTP Configuration v0.3.1
+// DO NOT EDIT THIS COMMENT - Migrator relies on it
+{
+  "version": "0.3.1",
+  "mode": "client",
+  ...
+}
+```
+
+## Справочник по новому формату
+
+Если вы предпочитаете настраивать OSTP вручную, ниже приведено сравнение и примеры нового формата.
+
+### Устаревшая конфигурация (v0.2.x)
+```json
+{
+  "mode": "client",
+  "server": "192.168.1.100:50000",
+  "access_key": "mysecretkey",
+  "socks5_bind": "127.0.0.1:1088",
+  "tun": {
+    "enable": true,
+    "kill_switch": true
+  },
+  "exclude": {
+    "domains": ["localhost"],
+    "ips": ["192.168.1.0/24"]
+  }
+}
+```
+
+### Новая конфигурация (v0.3.1)
+```json
+{
+  "version": "0.3.1",
+  "mode": "client",
+  "api": {
+    "enabled": true,
+    "bind": "127.0.0.1:50001",
+    "token": "admin-secret-token"
+  },
+  "log": {
+    "level": "info"
+  },
+  "inbounds": [
+    {
+      "type": "tun",
+      "tag": "tun-in",
+      "auto_route": true,
+      "mtu": 1140
+    },
+    {
+      "type": "socks",
+      "tag": "socks-in",
+      "bind_addr": "127.0.0.1:1088"
+    }
+  ],
+  "outbounds": [
+    {
+      "type": "ostp",
+      "tag": "proxy",
+      "server": "192.168.1.100",
+      "port": 50000,
+      "access_key": "mysecretkey",
+      "transport": {
+        "type": "udp"
+      },
+      "multiplex": {
+        "enabled": false
+      }
+    },
+    {
+      "type": "direct",
+      "tag": "direct"
+    },
+    {
+      "type": "block",
+      "tag": "block"
+    }
+  ],
+  "routing": {
+    "rules": [
+      {
+        "domain_suffix": ["localhost"],
+        "ip_cidr": ["192.168.1.0/24"],
+        "outbound": "direct"
+      }
+    ],
+    "default_outbound": "proxy"
+  }
+}
+```
+
+### Основные изменения
+- **Outbounds (Исходящие)**: Теперь можно задать сразу несколько прокси-серверов.
+- **Inbounds (Входящие)**: TUN и SOCKS5 выделены в отдельные независимые модули.
+- **Routing (Маршрутизация)**: Точная маршрутизация трафика между входящими и исходящими узлами на основе доменов, IP-адресов и имен процессов.
+- **Комментарии**: GUI и ядро теперь поддерживают JS-комментарии (с помощью `//`) в `config.json` вместо устаревших полей вида `"_comment"`.

docs/ru/obfuscation.md

@@ -49,3 +49,13 @@ $$\text{Key} = \text{SHA-256}(\text{access\_key})[0..8]$$
 
 - **Стратегия заполнения буферов**: Механизм анализирует текущую длину выборки телеметрии и производит масштабирование до типичных кратных длин промышленных сетей передачи данных и буферов потоковых агрегаторов.
 - **Изоляция выравнивания**: Данные заполнения помещаются внутрь защищенной области кадра. Внешние анализаторы топологии сети не способны определить внутренние границы между телеметрической нагрузкой и служебными полями выравнивания, видя только монолитный блок данных.
+
+## XTLS-Reality (Имитация TLS 1.3)
+
+OSTP предоставляет собственную реализацию протокола XTLS-Reality без сторонних зависимостей. Протокол полностью имитирует рукопожатие TLS 1.3 (с реалистичным профилем ClientHello) для обхода продвинутых DPI фильтров. После успешного рукопожатия применяется ChaCha20Poly1305 для бесшовного шифрования и туннелирования внутренних HTTP/WSS соединений.
+
+---
+
+## Невозможность создания статических фильтров (Защита от DPI)
+
+Благодаря строгой математической базе генерации энтропии, протокол полностью лишен открытых сигнатур. Это гарантирует, что системы фильтрации (например, ТСПУ от РКН или "Великий китайский файрвол") **физически не могут** написать эффективное правило блокировки, анализируя содержимое пакетов. Любая попытка написать фильтр приведет к блокировке легитимного, случайного UDP-трафика (например, WebRTC или игрового трафика). Безопасность базируется на принципе Керкгоффса — знание всех алгоритмов не помогает взломать или классифицировать трафик без `access_key`.

docs/ru/specification.md

@@ -0,0 +1,122 @@
+# Спецификация Ospab Stealth Transport Protocol (OSTP)
+
+**Версия:** 1.0 (Май 2026)  
+**Авторы:** Георгий С., Ospab Foundation
+**Статус:** Стабильный, Информационный  
+
+---
+
+## 1. Введение
+
+**Ospab Stealth Transport Protocol (OSTP)** — это высокоэнтропийный мультиплексируемый транспортный протокол 4-го уровня, разработанный для безопасной и отказоустойчивой передачи данных между распределенными узлами в сетях с сильными помехами и агрессивным глубоким анализом трафика (DPI).
+
+Стандартные туннельные протоколы (такие как OpenVPN, WireGuard) генерируют паттерны трафика, которые легко распознаются системами DPI по статичным «магическим байтам», фиксированным размерам рукопожатий или предсказуемым последовательностям. OSTP решает эту проблему, применяя математическое маскирование состояния и рандомизированное выравнивание границ пакетов перед отправкой в сеть. Главная цель архитектуры — достижение **максимальной равномерной энтропии**, при которой UDP-датаграммы статистически неотличимы от чистого белого шума.
+
+---
+
+## 2. Криптографические примитивы
+
+OSTP построен исключительно на базе стандартизированных современных криптографических алгоритмов:
+
+| Компонент | Примитив / Стандарт | Назначение |
+|---|---|---|
+| **Рукопожатие (Handshake)** | Noise Protocol Framework (`Noise_NNpsk0`) | Взаимная аутентификация и обмен ключами с прямой секретностью (Forward Secrecy). |
+| **Обмен ключами** | X25519 (RFC 7748) | Эфемерный протокол Диффи-Хеллмана на эллиптических кривых. |
+| **Симметричное шифрование** | ChaCha20-Poly1305 (RFC 8439) | Аутентифицированное шифрование (AEAD) для всех полезных данных. |
+| **Хеширование** | BLAKE2s (RFC 7693) | Внутреннее хеширование состояний в рамках фреймворка Noise. |
+| **Маскирование заголовков** | HMAC-SHA-256 (RFC 2104) | Динамическое искажение заголовков каждого пакета для устранения статических сигнатур. |
+
+---
+
+## 3. Архитектура протокола
+
+OSTP работает в парадигме клиент-сервер поверх одного двунаправленного UDP-сокета:
+*   **Relay Bridge (Клиент / Инициатор):** Устанавливает соединения, генерирует идентификаторы сессий (Session ID) и инициирует криптографическое рукопожатие.
+*   **Collector Node (Сервер / Отвечающий):** Принимает соединения, проверяет ключи доступа и ретранслирует трафик прикладного уровня.
+
+OSTP поддерживает **внутреннее криптографическое мультиплексирование**, позволяя передавать несколько логических потоков данных через единый сокет без эффекта блокировки начала очереди (Head-of-Line blocking).
+
+---
+
+## 4. Формат кадра (Спецификация заголовков)
+
+Сериализованный пакет OSTP соответствует физическим ограничениям MTU. Кадр состоит из предварительно замаскированного заголовка и зашифрованной полезной нагрузки с выравнивающим отступом (padding). Все многобайтовые поля используют сетевой порядок байт (big-endian).
+
+```text
+ 0                   1                   2                   3
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|          Замаскированный Session ID (32 бита)                 |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                                                               |
++                    Открытый Nonce (64 бита)                   +
+|                                                               |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                                                               |
+~               AEAD-шифротекст (Переменная длина)              ~
+|                                                               |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                    16-байтный тег Poly1305                    |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+```
+
+### 4.1 Описание полей
+
+*   **Замаскированный Session ID (32 бита):** Идентификатор сессии, замаскированный операцией XOR с использованием псевдослучайного потока, сгенерированного через HMAC-SHA-256.
+*   **Открытый Nonce (64 бита):** Монотонно возрастающий счетчик, используемый для отслеживания пакетов в ARQ и в качестве вектора инициализации (IV) для шифра AEAD. Передается в открытом виде, но полностью защищен от подмены (аутентифицирован как AAD в AEAD).
+*   **AEAD-шифротекст:** Внутренняя полезная нагрузка, зашифрованная ChaCha20-Poly1305.
+*   **Тег аутентификации (MAC):** 16-байтный код, гарантирующий целостность шифротекста и заголовков.
+
+---
+
+## 5. Обфускация трафика (IPMS)
+
+Чтобы гарантировать статистическую независимость поля Session ID в последовательных пакетах, OSTP использует метод **In-Place Matrix Scrambling (IPMS)** на базе HMAC-SHA-256.
+
+1.  **Генерация ключа обфускации:**
+    Оба узла независимо генерируют 8-байтный ключ обфускации (`K_obf`) из общего ключа доступа перед началом рукопожатия:
+    `K_obf = SHA-256(access_key || "obfusca")[0..7]`
+
+2.  **Попакетное маскирование:**
+    Session ID маскируется уникальным псевдослучайным значением для каждого пакета:
+    `mask[0..3] = HMAC-SHA-256(K_obf, Nonce)[0..3]`
+    `Masked_SID = SID_raw XOR mask`
+
+Так как `Nonce` уникален для каждого пакета, маска криптографически независима для каждой датаграммы. Пассивный анализатор (DPI) не может связать пакеты в единую сессию без знания `K_obf`.
+
+---
+
+## 6. Рукопожатие и криптографическая синхронизация
+
+OSTP использует Noise Protocol Framework с паттерном `Noise_NNpsk0_25519_ChaChaPoly_BLAKE2s`.
+
+1.  Регистрационный ключ доступа (`access_key`) преобразуется в 32-байтный строгий предварительно распределенный ключ (PSK) через SHA-256.
+2.  PSK применяется на нулевой позиции паттерна, обеспечивая авторизацию и шифрование самой первой датаграммы рукопожатия (Zero-RTT авторизация).
+3.  Выполняется эфемерный обмен ключами Curve25519 для создания симметричных ключей передачи данных.
+
+Первичная полезная нагрузка рукопожатия содержит Unix-отметку времени для защиты от атак повторного воспроизведения (Replay Attacks). Сервер строго контролирует окно синхронизации (±30 секунд).
+
+---
+
+## 7. Надежность и канал передачи данных
+
+### 7.1 Selective-Repeat ARQ
+OSTP обеспечивает надежную доставку поверх UDP с помощью механизма **Selective-Repeat ARQ**:
+*   Приемник поддерживает буфер переупорядочивания (по умолчанию: 8192 пакета).
+*   Неподтвержденные пакеты отправляются повторно после адаптивного тайм-аута (RTO).
+*   Подтверждения (ACK) встраиваются в исходящие кадры данных (piggybacking) для минимизации накладных расходов.
+*   Протокол динамически применяет "обратное давление" (backpressure), ограничивая чтение новых данных, если число неподтвержденных кадров в полете слишком велико.
+
+### 7.2 Адаптивный Padding
+Для защиты от анализа длин пакетов (Packet Length Analysis, PLA), OSTP добавляет выравнивающий отступ к открытому тексту перед AEAD-шифрованием. Байты отступа берутся из криптографически стойкого генератора псевдослучайных чисел ОС. Протокол поддерживает динамическое выравнивание вплоть до полного размера MTU (например, 1400 байт), сглаживая узнаваемые всплески трафика приложений и превращая их в подобие CBR (Constant Bit Rate) потока.
+
+### 7.3 IP-роуминг (IP Roaming)
+Сервер поддерживает бесшовную смену сетей (например, переключение со смартфона с Wi-Fi на LTE). Если сервер получает пакет с новым IP-адресом отправителя, но пакет успешно проходит AEAD-аутентификацию с использованием текущих ключей, сервер автоматически привязывает эту сессию к новому IP-адресу без обрыва соединения.
+
+---
+
+## 8. Безопасность (Security Considerations)
+
+*   **Исчерпание Nonce:** Поле Nonce имеет размер 64 бита. Реализации ОБЯЗАНЫ разрывать сессию до переполнения Nonce, чтобы предотвратить катастрофическое повторное использование гаммы AEAD-шифра.
+*   **DDoS и исчерпание ресурсов:** Серверы ДОЛЖНЫ применять жесткий лимит на количество одновременных сессий (например, 1024) и молча отбрасывать запросы на рукопожатие при превышении лимита, предотвращая атаки на исчерпание памяти.
+*   **Целостность заголовка:** Механизм маскирования обеспечивает только скрытность, а не целостность. Целостность заголовков математически гарантируется 16-байтным тегом аутентификации Poly1305, который покрывает 12-байтный заголовок как присоединенные данные (AAD).

icons/sqare.svg

@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <defs>
+    <linearGradient id="g2" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#111827" />
+      <stop offset="100%" stop-color="#374151" />
+    </linearGradient>
+    <linearGradient id="g2_path" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#3B82F6" />
+      <stop offset="100%" stop-color="#14B8A6" />
+    </linearGradient>
+  </defs>
+  <rect width="512" height="512" rx="120" fill="url(#g2)" />
+  <path d="M144 256c0-61.9 50.1-112 112-112s112 50.1 112 112-50.1 112-112 112S144 317.9 144 256zm-48 0c0 88.4 71.6 160 160 160s160-71.6 160-160S344.4 96 256 96 96 167.6 96 256z" fill="url(#g2_path)"/>
+  <circle cx="256" cy="256" r="40" fill="#F59E0B" />
+</svg>

netstack-smoltcp/.cargo-ok

@@ -0,0 +1 @@
+{"v":1}

netstack-smoltcp/.cargo_vcs_info.json

@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "702f6dfe124c5e4d343cfd3ca5a3efe0446cf6f0"
+  },
+  "path_in_vcs": ""
+}

netstack-smoltcp/.github/actions/ndk-dev-rs/action.yml

@@ -0,0 +1,37 @@
+name: Setup Android NDK and Rust compiler ENV
+description: Setup an Android_NDK_HOME environment by downloading and Rust compiler environment.
+inputs:
+  rust-target:
+    description: Rust target to build
+    required: true
+  sdk-version:
+    description: Exact SDK version to use
+    default: "33"
+  ndk-version:
+    description: Exact NDK version to use
+    default: "25"
+  ndk-platform:
+    description: Which host platform to use
+    default: "linux"
+runs:
+  using: "composite"
+  steps:
+    - name: Download Android NDK
+      run: curl --http1.1 -O https://dl.google.com/android/repository/android-ndk-r${{ inputs.ndk-version }}-${{ inputs.ndk-platform }}.zip
+      shell: bash
+    - name: Extract Android NDK
+      run: unzip -q android-ndk-r${{ inputs.ndk-version }}-${{ inputs.ndk-platform }}.zip
+      shell: bash
+    - name: Set Rust compiler ENV
+      run: |
+        ndk_home=${{ github.workspace }}/android-ndk-r${{ inputs.ndk-version }}
+        platform=$(ls ${ndk_home}/toolchains/llvm/prebuilt/ | head -1)
+        ndk_tool=${ndk_home}/toolchains/llvm/prebuilt/${platform}/bin
+        envvar_suffix=$(echo ${{ inputs.rust-target }} | sed "s/-/_/g")
+        upper_suffix=$(echo ${envvar_suffix} | tr '[:lower:]' '[:upper:]')
+        tool_prefix=${{ inputs.rust-target }}${{ inputs.sdk-version }}
+        echo "ANDROID_NDK_HOME=${ndk_home}" >> $GITHUB_ENV
+        echo "CC_${envvar_suffix}=${ndk_tool}/${tool_prefix}-clang" >> $GITHUB_ENV
+        echo "AR_${envvar_suffix}=${ndk_tool}/llvm-ar" >> $GITHUB_ENV
+        echo "CARGO_TARGET_${upper_suffix}_LINKER=${ndk_tool}/${tool_prefix}-clang" >> $GITHUB_ENV
+      shell: bash

netstack-smoltcp/.github/workflows/main.yml

@@ -0,0 +1,80 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    branches:
+      - '**'
+
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
+
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - build: linux-amd64
+            os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+          - build: android-arm64
+            os: ubuntu-latest
+            target: aarch64-linux-android
+            no_run: --no-run
+          - build: android-amd64
+            os: ubuntu-latest
+            target: x86_64-linux-android
+            no_run: --no-run
+          - build: macos-amd64
+            os: macos-latest
+            target: x86_64-apple-darwin
+          - build: macos-arm64
+            os: macos-14
+            target: aarch64-apple-darwin
+          - build: ios-arm64
+            os: macos-latest
+            target: aarch64-apple-ios
+            no_run: --no-run
+          - build: windows-amd64
+            os: windows-latest
+            target: x86_64-pc-windows-msvc
+          - build: windows-arm64
+            os: windows-latest
+            target: aarch64-pc-windows-msvc
+            no_run: --no-run
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust (rustup)
+        run: |
+          set -euxo pipefail
+          rustup toolchain install stable --no-self-update --profile minimal --target ${{ matrix.target }}
+          rustup default stable
+        shell: bash
+      - uses: Swatinem/rust-cache@v2
+      - name: Setup android environment
+        if: contains(matrix.build, 'android')
+        uses: ./.github/actions/ndk-dev-rs
+        with:
+          rust-target: ${{ matrix.target }}
+      - run: cargo test ${{ matrix.no_run }} --workspace --target ${{ matrix.target }}
+      - run: cargo test ${{ matrix.no_run }} --workspace --target ${{ matrix.target }} --release
+
+  msrv_n_clippy:
+    name: MSRV & Clippy & Rustfmt
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo fmt -- --check
+      - run: cargo clippy --all-features -- -D warnings
+      - run: cargo check --lib -p netstack-smoltcp
+      - run: cargo check --lib -p netstack-smoltcp --all-features

netstack-smoltcp/.github/workflows/publish.yml

@@ -0,0 +1,15 @@
+on:
+  push:
+    tags:        
+      - '*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Publish to crates.io
+      run: |
+        cargo publish
+      env:
+        CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

netstack-smoltcp/.gitignore

@@ -0,0 +1,9 @@
+/target
+/Cargo.lock
+
+.idea
+.VSCodeCounter/
+.vscode
+.DS_Store
+*.iml
+**/*.log

netstack-smoltcp/Cargo.toml

@@ -0,0 +1,136 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+rust-version = "1.75.0"
+name = "netstack-smoltcp"
+version = "0.2.2"
+authors = ["cavivie <cavivie@gmail.com>"]
+build = false
+autolib = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = """
+A netstack for the special purpose of turning packets from/to a TUN interface
+into TCP streams and UDP packets. It uses smoltcp-rs as the backend netstack.
+"""
+homepage = "https://github.com/cavivie/netstack-smoltcp"
+documentation = "https://docs.rs/netstack-smoltcp"
+readme = "README.md"
+keywords = [
+    "netstack",
+    "smoltcp",
+    "network",
+    "ip",
+    "tun",
+]
+categories = ["network-programming"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/cavivie/netstack-smoltcp"
+
+[lib]
+name = "netstack_smoltcp"
+path = "src/lib.rs"
+
+[[example]]
+name = "forward"
+path = "examples/forward.rs"
+
+[[example]]
+name = "forward-offload-linux"
+path = "examples/forward-offload-linux.rs"
+
+[[test]]
+name = "regression"
+path = "tests/regression.rs"
+
+[dependencies.etherparse]
+version = "0.16"
+
+[dependencies.futures]
+version = "0.3"
+
+[dependencies.rand]
+version = "0.8"
+
+[dependencies.smoltcp]
+version = "0.12"
+features = [
+    "std",
+    "log",
+    "medium-ip",
+    "proto-ipv4",
+    "proto-ipv6",
+    "socket-icmp",
+    "socket-udp",
+    "socket-tcp",
+]
+default-features = false
+
+[dependencies.spin]
+version = "0.9"
+
+[dependencies.tokio]
+version = "1"
+features = [
+    "sync",
+    "time",
+    "rt",
+    "macros",
+]
+
+[dependencies.tokio-util]
+version = "0.7.10"
+
+[dependencies.tracing]
+version = "0.1"
+features = ["std"]
+default-features = false
+
+[dev-dependencies.socket2]
+version = "0.5.6"
+
+[dev-dependencies.socket2-ext]
+version = "0.1"
+
+[dev-dependencies.structopt]
+version = "0.3"
+
+[dev-dependencies.tokio]
+version = "1"
+features = [
+    "rt",
+    "macros",
+    "rt-multi-thread",
+    "io-util",
+]
+
+[dev-dependencies.tracing]
+version = "0.1"
+features = ["std"]
+default-features = false
+
+[dev-dependencies.tracing-subscriber]
+version = "0.3.18"
+
+[dev-dependencies.tun-rs]
+version = "2"
+features = [
+    "async",
+    "async_framed",
+]
+
+[dev-dependencies.tun2]
+version = "3"
+features = ["async"]

netstack-smoltcp/Cargo.toml.orig

@@ -0,0 +1,51 @@
+[package]
+name = "netstack-smoltcp"
+version = "0.2.2"
+edition = "2021"
+authors = ["cavivie <cavivie@gmail.com>"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/cavivie/netstack-smoltcp"
+homepage = "https://github.com/cavivie/netstack-smoltcp"
+documentation = "https://docs.rs/netstack-smoltcp"
+keywords = ["netstack", "smoltcp", "network", "ip", "tun"]
+categories = ["network-programming"]
+description = """
+A netstack for the special purpose of turning packets from/to a TUN interface
+into TCP streams and UDP packets. It uses smoltcp-rs as the backend netstack.
+"""
+rust-version = "1.75.0"
+
+[dependencies]
+tracing = { version = "0.1", default-features = false, features = ["std"] }
+tokio = { version = "1", features = ["sync", "time", "rt", "macros"] }
+tokio-util = "0.7.10"
+etherparse = "0.16"
+futures = "0.3"
+rand = "0.8"
+spin = "0.9"
+smoltcp = { version = "0.12", default-features = false, features = [
+    "std",
+    "log",
+    "medium-ip",
+    "proto-ipv4",
+    "proto-ipv6",
+    "socket-icmp",
+    "socket-udp",
+    "socket-tcp",
+] }
+
+[dev-dependencies]
+tun2 = { version = "3", features = ["async"] }
+# has better performance on linux than tun2
+tun-rs = { version = "2", features = ["async", "async_framed"] } 
+tokio = { version = "1", features = [
+    "rt",
+    "macros",
+    "rt-multi-thread",
+    "io-util",
+] }
+tracing = { version = "0.1", default-features = false, features = ["std"] }
+tracing-subscriber = "0.3.18"
+structopt = "0.3"
+socket2 = "0.5.6"
+socket2-ext = { version = "0.1" }

netstack-smoltcp/LICENSE-APACHE

@@ -0,0 +1,201 @@
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netstack-smoltcp/LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2024 cavivie and netstack-smoltcp Contributors
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

netstack-smoltcp/README.md

@@ -0,0 +1,136 @@
+# Netstack Smoltcp
+
+A netstack for the special purpose of turning packets from/to a TUN interface into TCP streams and UDP packets. It uses smoltcp-rs as the backend netstack.
+
+[![Crates.io][crates-badge]][crates-url]
+[![MIT licensed][mit-badge]][mit-url]
+[![Apache licensed, Version 2.0][apache-badge]][apache-url]
+[![Build Status][actions-badge]][actions-url]
+
+[crates-badge]: https://img.shields.io/crates/v/netstack-smoltcp.svg
+[crates-url]: https://crates.io/crates/netstack-smoltcp
+[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
+[mit-url]: https://github.com/automesh-network/netstack-smoltcp/blob/master/LICENSE-MIT
+[apache-badge]: https://img.shields.io/badge/license-APACHE2.0-blue.svg
+[apache-url]: https://github.com/automesh-network/netstack-smoltcp/blob/master/LICENSE-APACHE
+[actions-badge]: https://github.com/automesh-network/netstack-smoltcp/workflows/CI/badge.svg
+[actions-url]: https://github.com/automesh-network/netstack-smoltcp/actions?query=workflow%3ACI+branch%3Amain
+
+## Features
+
+- Supports Future Send and non-Send, mostly pepole use Send.
+- Supports ICMP protocol drive by TCP runner to use ICMP ping.
+- Supports filtering packets by source and destination IP addresses.
+- Can read IP packets from netstack, write IP packets to netstack.
+- Can receive TcpStream from TcpListener exposed from netstack.
+- Can receive UDP datagram from UdpSocket exposed from netstack.
+- Implements popular future streaming traits and asynchronous IO traits:
+    * TcpListener implements futures Stream/Sink trait
+    * TcpStream implements tokio AsyncRead/AsyncWrite trait
+    * UdpSocket(ReadHalf/WriteHalf) implements futures Stream/Sink trait.
+
+## Platforms
+
+This crate provides lightweight netstack support for Linux, iOS, macOS, Android and Windows.
+Currently, it works on most targets, but mainly tested the popular platforms which includes:
+- linux-amd64: x86_64-unknown-linux-gnu
+- android-arm64: aarch64-linux-android
+- android-amd64: x86_64-linux-android
+- macos-amd64: x86_64-apple-darwin
+- macos-arm64: aarch64-apple-darwin
+- ios-arm64: aarch64-apple-ios
+- windows-amd64: x86_64-pc-windows-msvc
+- windows-arm64: aarch64-pc-windows-msvc
+
+## Example
+
+```rust
+// let device = tun2::create_as_async(&cfg)?;
+// let framed = device.into_framed();
+
+let (stack, runner, udp_socket, tcp_listener) = netstack_smoltcp::StackBuilder::default()
+    .stack_buffer_size(512)
+    .tcp_buffer_size(4096)
+    .enable_udp(true)
+    .enable_tcp(true)
+    .enable_icmp(true)
+    .mtu(9000) // virtual device usually benefits from larger MTU
+    .build()
+    .unwrap();
+let mut udp_socket = udp_socket.unwrap(); // udp enabled
+let mut tcp_listener = tcp_listener.unwrap(); // tcp/icmp enabled
+if let Some(runner) = runner {
+    tokio::spawn(runner);
+}
+
+let (mut stack_sink, mut stack_stream) = stack.split();
+let (mut tun_sink, mut tun_stream) = framed.split();
+
+// Reads packet from stack and sends to TUN.
+tokio::spawn(async move {
+    while let Some(pkt) = stack_stream.next().await {
+        if let Ok(pkt) = pkt {
+            tun_sink.send(pkt).await.unwrap();
+        }
+    }
+});
+
+// Reads packet from TUN and sends to stack.
+tokio::spawn(async move {
+    while let Some(pkt) = tun_stream.next().await {
+        if let Ok(pkt) = pkt {
+            stack_sink.send(pkt).await.unwrap();
+        }
+    }
+});
+
+// Extracts TCP connections from stack and sends them to the dispatcher.
+tokio::spawn(async move {
+    handle_inbound_stream(tcp_listener).await;
+});
+
+// Receive and send UDP packets between netstack and NAT manager. The NAT
+// manager would maintain UDP sessions and send them to the dispatcher.
+tokio::spawn(async move {
+    handle_inbound_datagram(udp_socket).await;
+});
+```
+
+## Performance
+
+Typically, `netstack-smoltcp` will be used with an tun device, so a careful choice of TUN crate matters.
+
+[tun-rs](https://github.com/tun-rs/tun-rs) have better performance on **Linux** than [rust-tun](https://github.com/meh/rust-tun/) due to GSO/GRO which allow you to process the packets in batches.
+
+`bash scripts/bench-offload.sh` could tell that `tun-rs` boosts the performance by 4x. Try it out on your Linux machine!
+
+The example for using `tun-rs` with `netstack-smoltcp` could be found at [forward-offload-linux.rs](examples/forward-offload-linux.rs)
+
+For further tuning, refer to `tun-rs`'s detailed [README](https://github.com/tun-rs/tun-rs/blob/main/README.md)
+
+## License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   https://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   https://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in netstack-smoltcp by you, as defined in the Apache-2.0 license,
+shall be dual licensed as above, without any additional terms or conditions.
+
+## Inspired By
+
+Special thanks to these amazing projects that inspired netstack-smoltcp (in no particular order):
+- [shadowsocks-rust](https://github.com/shadowsocks/shadowsocks-rust/)
+- [netstack-lwip](https://github.com/eycorsican/netstack-lwip/)
+- [rust-tun-active](https://github.com/tun2proxy/rust-tun)
+- [rust-tun](https://github.com/meh/rust-tun/)
+- [tun-rs](https://github.com/tun-rs/tun-rs)
+- [smoltcp](https://github.com/smoltcp-rs/smoltcp)

netstack-smoltcp/examples/forward-offload-linux.rs

@@ -0,0 +1,239 @@
+#[cfg(target_os = "linux")]
+mod inner {
+    use futures::{SinkExt, StreamExt};
+    use netstack_smoltcp::{StackBuilder, TcpListener, UdpSocket};
+    use std::{net::SocketAddr, sync::Arc};
+    use structopt::StructOpt;
+    use tokio::net::{TcpSocket, TcpStream};
+    use tracing::{error, info, warn};
+    use tun_rs::{DeviceBuilder, IDEAL_BATCH_SIZE, VIRTIO_NET_HDR_LEN};
+
+    // Patched forward example: tun2 → tun-rs with Linux GRO/GSO offload.
+    // For further reading, check out https://blog.cloudflare.com/virtual-networking-101-understanding-tap
+    //
+    // Key changes vs forward.rs:
+    //   1. Use tun-rs DeviceBuilder with .offload(true) on Linux (enables
+    //      IFF_VNET_HDR + TUN_F_CSUM/TSO4/TSO6/USO4/USO6).
+    //   2. TX (stack → TUN): prepend 10-byte zero virtio_net_hdr (GSO_NONE)
+    //      so the kernel accepts the write when IFF_VNET_HDR is set.
+    //   3. RX (TUN → stack): use recv_multiple() for batch GSO splitting;
+    //      buffers sized to 1600 to fit smoltcp's 1504-byte MTU segments.
+    #[derive(Debug, StructOpt)]
+    #[structopt(name = "forward", about = "Simply forward tun tcp/udp traffic.")]
+    struct Opt {
+        /// Outbound interface to bind forwarded connections to.
+        #[structopt(short = "i", long = "interface")]
+        interface: String,
+        /// Name of the TUN device.
+        #[structopt(short = "n", long = "name", default_value = "utun8")]
+        name: String,
+        /// Tracing log level.
+        #[structopt(long = "log-level", default_value = "debug")]
+        log_level: tracing::Level,
+        /// Use current-thread Tokio runtime (default: multi-thread).
+        #[structopt(long = "current-thread")]
+        current_thread: bool,
+        /// Use spawn_local instead of spawn.
+        #[structopt(long = "local-task")]
+        local_task: bool,
+    }
+
+    pub(super) fn main() {
+        let opt = Opt::from_args();
+        let rt = if opt.current_thread {
+            tokio::runtime::Builder::new_current_thread()
+        } else {
+            tokio::runtime::Builder::new_multi_thread()
+        }
+        .enable_all()
+        .build()
+        .unwrap();
+        rt.block_on(main_exec(opt));
+    }
+
+    async fn main_exec(opt: Opt) {
+        macro_rules! tokio_spawn {
+            ($fut:expr) => {
+                if opt.local_task {
+                    tokio::task::spawn_local($fut)
+                } else {
+                    tokio::task::spawn($fut)
+                }
+            };
+        }
+        tracing::subscriber::set_global_default(
+            tracing_subscriber::FmtSubscriber::builder()
+                .with_max_level(opt.log_level)
+                .finish(),
+        )
+        .unwrap();
+
+        // Build TUN device with GRO/GSO offload on Linux.
+        let builder = DeviceBuilder::new()
+            .name(opt.name)
+            .ipv4("10.10.10.2", 24, Some("10.10.10.1"))
+            .mtu(9000);
+        let builder = builder.offload(true);
+        let dev = Arc::new(builder.build_async().unwrap());
+
+        let (stack, runner, udp_socket, tcp_listener) = StackBuilder::default()
+            .enable_tcp(true)
+            .enable_udp(true)
+            .enable_icmp(true)
+            .build()
+            .unwrap();
+        let udp_socket = udp_socket.unwrap();
+        let tcp_listener = tcp_listener.unwrap();
+        if let Some(runner) = runner {
+            tokio_spawn!(runner);
+        }
+        let (mut stack_sink, mut stack_stream) = stack.split();
+
+        let mut futs = vec![];
+
+        // stack → TUN
+        // With IFF_VNET_HDR every write must start with a virtio_net_hdr.
+        // We use all-zero (gso_type = GSO_NONE, flags = 0): plain packet,
+        // checksum already valid (smoltcp always computes checksums itself).
+        let dev1 = dev.clone();
+        futs.push(tokio_spawn!(async move {
+            while let Some(pkt) = stack_stream.next().await {
+                if let Ok(pkt) = pkt {
+                    let result = {
+                        let mut buf = vec![0u8; VIRTIO_NET_HDR_LEN + pkt.len()];
+                        buf[VIRTIO_NET_HDR_LEN..].copy_from_slice(&pkt);
+                        dev1.send(&buf).await
+                    };
+                    if let Err(e) = result {
+                        warn!("failed to send packet to TUN: {:?}", e);
+                    }
+                }
+            }
+        }));
+
+        // TUN → stack
+        // recv_multiple() does one read() syscall and returns N individual IP
+        // packets after splitting any incoming GRO super-packet.
+        // Buffer size 1600 > smoltcp MTU (1504) to avoid an out-of-bounds panic
+        // when the kernel segments at MSS=1464 with 40-byte IP+TCP headers.
+        futs.push(tokio_spawn!(async move {
+            let mut orig = vec![0u8; VIRTIO_NET_HDR_LEN + 65535];
+            let mut bufs = vec![vec![0u8; 1600]; IDEAL_BATCH_SIZE];
+            let mut sizes = vec![0usize; IDEAL_BATCH_SIZE];
+            while let Ok(n) = dev.recv_multiple(&mut orig, &mut bufs, &mut sizes, 0).await {
+                for i in 0..n {
+                    let pkt = &bufs[i][..sizes[i]];
+                    if let Err(e) = stack_sink.send(pkt.to_vec()).await {
+                        warn!("failed to send packet to stack: {:?}", e);
+                    }
+                }
+            }
+        }));
+
+        futs.push(tokio_spawn!({
+            let iface = opt.interface.clone();
+            async move {
+                handle_inbound_stream(tcp_listener, iface).await;
+            }
+        }));
+
+        futs.push(tokio_spawn!(async move {
+            handle_inbound_datagram(udp_socket, opt.interface).await;
+        }));
+
+        futures::future::join_all(futs).await.iter().for_each(|r| {
+            if let Err(e) = r {
+                error!("{:?}", e);
+            }
+        });
+    }
+
+    async fn handle_inbound_stream(mut tcp_listener: TcpListener, interface: String) {
+        while let Some((mut stream, local, remote)) = tcp_listener.next().await {
+            let interface = interface.clone();
+            tokio::spawn(async move {
+                info!("tcp: {:?} => {:?}", local, remote);
+                match new_tcp_stream(remote, &interface).await {
+                    Ok(mut r) => {
+                        if let Err(e) = tokio::io::copy_bidirectional(&mut stream, &mut r).await {
+                            warn!(
+                                "failed to copy tcp stream {:?}=>{:?}: {:?}",
+                                local, remote, e
+                            );
+                        }
+                    }
+                    Err(e) => warn!(
+                        "failed to open tcp stream {:?}=>{:?}: {:?}",
+                        local, remote, e
+                    ),
+                }
+            });
+        }
+    }
+
+    async fn handle_inbound_datagram(udp_socket: UdpSocket, interface: String) {
+        let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel();
+        let (mut read_half, mut write_half) = udp_socket.split();
+        tokio::spawn(async move {
+            while let Some((data, local, remote)) = rx.recv().await {
+                let _ = write_half.send((data, remote, local)).await;
+            }
+        });
+        while let Some((data, local, remote)) = read_half.next().await {
+            let tx = tx.clone();
+            let interface = interface.clone();
+            tokio::spawn(async move {
+                match new_udp_packet(remote, &interface).await {
+                    Ok(sock) => {
+                        let _ = sock.send(&data).await;
+                        loop {
+                            let mut buf = vec![0; 1024];
+                            match sock.recv_from(&mut buf).await {
+                                Ok((n, _)) => {
+                                    let _ = tx.send((buf[..n].to_vec(), local, remote));
+                                }
+                                Err(e) => {
+                                    warn!("udp recv {:?}: {:?}", remote, e);
+                                    break;
+                                }
+                            }
+                        }
+                    }
+                    Err(e) => warn!("failed to open udp socket {:?}: {:?}", remote, e),
+                }
+            });
+        }
+    }
+
+    async fn new_tcp_stream(addr: SocketAddr, iface: &str) -> std::io::Result<TcpStream> {
+        use socket2_ext::{AddressBinding, BindDeviceOption};
+        let s = socket2::Socket::new(socket2::Domain::IPV4, socket2::Type::STREAM, None)?;
+        s.bind_to_device(BindDeviceOption::v4(iface))?;
+        s.set_keepalive(true)?;
+        s.set_nodelay(true)?;
+        s.set_nonblocking(true)?;
+        Ok(TcpSocket::from_std_stream(s.into()).connect(addr).await?)
+    }
+
+    async fn new_udp_packet(
+        addr: SocketAddr,
+        iface: &str,
+    ) -> std::io::Result<tokio::net::UdpSocket> {
+        use socket2_ext::{AddressBinding, BindDeviceOption};
+        let s = socket2::Socket::new(socket2::Domain::IPV4, socket2::Type::DGRAM, None)?;
+        s.bind_to_device(BindDeviceOption::v4(iface))?;
+        s.set_nonblocking(true)?;
+        let sock = tokio::net::UdpSocket::from_std(s.into())?;
+        sock.connect(addr).await?;
+        Ok(sock)
+    }
+}
+
+#[cfg(not(target_os = "linux"))]
+mod inner {
+    pub(super) fn main() {}
+}
+
+fn main() {
+    inner::main();
+}

netstack-smoltcp/examples/forward.rs

@@ -0,0 +1,326 @@
+use std::net::{IpAddr, SocketAddr};
+
+use futures::{SinkExt, StreamExt};
+use netstack_smoltcp::{StackBuilder, TcpListener, UdpSocket};
+use structopt::StructOpt;
+use tokio::net::{TcpSocket, TcpStream};
+use tracing::{error, info, warn};
+
+// to run this example, you should set the policy routing **after the start of the main program**
+//
+// linux:
+// with bind device:
+// `curl 1.1.1.1 --interface utun8`
+// with default route:
+// `bash scripts/route-linux.sh add`
+// `curl 1.1.1.1`
+// with single route:
+// `ip rule add to 1.1.1.1 table 200`
+// `ip route add default dev utun8 table 200`
+// `curl 1.1.1.1`
+//
+// macos:
+// with default route:
+// `bash scripts/route-macos.sh add`
+// `curl 1.1.1.1`
+//
+// windows:
+// with default route:
+// tun2 set default route automatically, won't set agian
+// # `powershell.exe scripts/route-windows.ps1 add`
+// `curl 1.1.1.1`
+//
+// currently, the example only supports the TCP stream, and the UDP packet will be dropped.
+
+#[derive(Debug, StructOpt)]
+#[structopt(name = "forward", about = "Simply forward tun tcp/udp traffic.")]
+struct Opt {
+    /// Default binding interface, default by guessed.
+    /// Specify but doesn't exist, no device is bound.
+    #[structopt(short = "i", long = "interface")]
+    interface: String,
+
+    /// name of the tun device, default to rtun8.
+    #[structopt(short = "n", long = "name", default_value = "utun8")]
+    name: String,
+
+    /// Tracing subscriber log level.
+    #[structopt(long = "log-level", default_value = "debug")]
+    log_level: tracing::Level,
+
+    /// Tokio current-thread runtime, default to multi-thread.
+    #[structopt(long = "current-thread")]
+    current_thread: bool,
+
+    /// Tokio task spawn_local, default to spwan.
+    #[structopt(long = "local-task")]
+    local_task: bool,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+
+    let rt = if opt.current_thread {
+        tokio::runtime::Builder::new_current_thread()
+    } else {
+        tokio::runtime::Builder::new_multi_thread()
+    }
+    .enable_all()
+    .build()
+    .unwrap();
+
+    rt.block_on(main_exec(opt));
+}
+
+async fn main_exec(opt: Opt) {
+    macro_rules! tokio_spawn {
+        ($fut: expr) => {
+            if opt.local_task {
+                tokio::task::spawn_local($fut)
+            } else {
+                tokio::task::spawn($fut)
+            }
+        };
+    }
+
+    tracing::subscriber::set_global_default(
+        tracing_subscriber::FmtSubscriber::builder()
+            .with_max_level(opt.log_level)
+            .finish(),
+    )
+    .unwrap();
+
+    let mut cfg = tun2::Configuration::default();
+    cfg.layer(tun2::Layer::L3);
+    let fd = -1;
+    if fd >= 0 {
+        cfg.raw_fd(fd);
+    } else {
+        cfg.tun_name(&opt.name)
+            .address("10.10.10.2")
+            .destination("10.10.10.1")
+            .mtu(tun2::DEFAULT_MTU);
+        #[cfg(not(any(target_arch = "mips", target_arch = "mips64",)))]
+        {
+            cfg.netmask("255.255.255.0");
+        }
+        cfg.up();
+    }
+
+    let device = tun2::create_as_async(&cfg).unwrap();
+    let mut builder = StackBuilder::default()
+        .enable_tcp(true)
+        .enable_udp(true)
+        .enable_icmp(true)
+        .mtu(9000);
+    if let Some(device_broadcast) = get_device_broadcast(&device) {
+        builder = builder
+            // .add_ip_filter(Box::new(move |src, dst| *src != device_broadcast && *dst != device_broadcast));
+            .add_ip_filter_fn(move |src, dst| *src != device_broadcast && *dst != device_broadcast);
+    }
+
+    let (stack, runner, udp_socket, tcp_listener) = builder.build().unwrap();
+    let udp_socket = udp_socket.unwrap(); // udp enabled
+    let tcp_listener = tcp_listener.unwrap(); // tcp enabled or icmp enabled
+
+    if let Some(runner) = runner {
+        tokio_spawn!(runner);
+    }
+
+    let framed = device.into_framed();
+    let (mut tun_sink, mut tun_stream) = framed.split();
+    let (mut stack_sink, mut stack_stream) = stack.split();
+
+    let mut futs = vec![];
+
+    // Reads packet from stack and sends to TUN.
+    futs.push(tokio_spawn!(async move {
+        while let Some(pkt) = stack_stream.next().await {
+            if let Ok(pkt) = pkt {
+                match tun_sink.send(pkt).await {
+                    Ok(_) => {}
+                    Err(e) => warn!("failed to send packet to TUN, err: {:?}", e),
+                }
+            }
+        }
+    }));
+
+    // Reads packet from TUN and sends to stack.
+    futs.push(tokio_spawn!(async move {
+        while let Some(pkt) = tun_stream.next().await {
+            if let Ok(pkt) = pkt {
+                match stack_sink.send(pkt).await {
+                    Ok(_) => {}
+                    Err(e) => warn!("failed to send packet to stack, err: {:?}", e),
+                };
+            }
+        }
+    }));
+
+    // Extracts TCP connections from stack and sends them to the dispatcher.
+    futs.push(tokio_spawn!({
+        let interface = opt.interface.clone();
+        async move {
+            handle_inbound_stream(tcp_listener, interface).await;
+        }
+    }));
+
+    // Receive and send UDP packets between netstack and NAT manager. The NAT
+    // manager would maintain UDP sessions and send them to the dispatcher.
+    futs.push(tokio_spawn!(async move {
+        handle_inbound_datagram(udp_socket, opt.interface).await;
+    }));
+
+    futures::future::join_all(futs)
+        .await
+        .iter()
+        .for_each(|res| {
+            if let Err(e) = res {
+                error!("error: {:?}", e);
+            }
+        });
+}
+
+/// simply forward tcp stream
+async fn handle_inbound_stream(mut tcp_listener: TcpListener, interface: String) {
+    while let Some((mut stream, local, remote)) = tcp_listener.next().await {
+        let interface = interface.clone();
+        tokio::spawn(async move {
+            info!("new tcp connection: {:?} => {:?}", local, remote);
+            match new_tcp_stream(remote, &interface).await {
+                Ok(mut remote_stream) => {
+                    // pipe between two tcp stream
+                    match tokio::io::copy_bidirectional(&mut stream, &mut remote_stream).await {
+                        Ok(_) => {}
+                        Err(e) => warn!(
+                            "failed to copy tcp stream {:?}=>{:?}, err: {:?}",
+                            local, remote, e
+                        ),
+                    }
+                }
+                Err(e) => warn!(
+                    "failed to new tcp stream {:?}=>{:?}, err: {:?}",
+                    local, remote, e
+                ),
+            }
+        });
+    }
+}
+
+/// simply forward udp datagram
+async fn handle_inbound_datagram(udp_socket: UdpSocket, interface: String) {
+    let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel();
+    let (mut read_half, mut write_half) = udp_socket.split();
+    tokio::spawn(async move {
+        while let Some((data, local, remote)) = rx.recv().await {
+            let _ = write_half.send((data, remote, local)).await;
+        }
+    });
+
+    while let Some((data, local, remote)) = read_half.next().await {
+        let tx = tx.clone();
+        let interface = interface.clone();
+        tokio::spawn(async move {
+            info!("new udp datagram: {:?} => {:?}", local, remote);
+            match new_udp_packet(remote, &interface).await {
+                Ok(remote_socket) => {
+                    // pipe between two udp sockets
+                    let _ = remote_socket.send(&data).await;
+                    loop {
+                        let mut buf = vec![0; 1024];
+                        match remote_socket.recv_from(&mut buf).await {
+                            Ok((len, _)) => {
+                                let _ = tx.send((buf[..len].to_vec(), local, remote));
+                            }
+                            Err(e) => {
+                                warn!(
+                                    "failed to recv udp datagram {:?}<->{:?}: {:?}",
+                                    local, remote, e
+                                );
+                                break;
+                            }
+                        }
+                    }
+                }
+                Err(e) => warn!(
+                    "failed to new udp socket {:?}=>{:?}, err: {:?}",
+                    local, remote, e
+                ),
+            }
+        });
+    }
+}
+
+async fn new_tcp_stream<'a>(addr: SocketAddr, iface: &str) -> std::io::Result<TcpStream> {
+    use socket2_ext::{AddressBinding, BindDeviceOption};
+    let socket = socket2::Socket::new(socket2::Domain::IPV4, socket2::Type::STREAM, None)?;
+    socket.bind_to_device(BindDeviceOption::v4(iface))?;
+    socket.set_keepalive(true)?;
+    socket.set_nodelay(true)?;
+    socket.set_nonblocking(true)?;
+
+    let stream = TcpSocket::from_std_stream(socket.into())
+        .connect(addr)
+        .await?;
+
+    Ok(stream)
+}
+
+async fn new_udp_packet(addr: SocketAddr, iface: &str) -> std::io::Result<tokio::net::UdpSocket> {
+    use socket2_ext::{AddressBinding, BindDeviceOption};
+    let socket = socket2::Socket::new(socket2::Domain::IPV4, socket2::Type::DGRAM, None)?;
+    socket.bind_to_device(BindDeviceOption::v4(iface))?;
+    socket.set_nonblocking(true)?;
+
+    let socket = tokio::net::UdpSocket::from_std(socket.into());
+    if let Ok(ref socket) = socket {
+        socket.connect(addr).await?;
+    }
+    socket
+}
+
+fn get_device_broadcast(device: &tun2::AsyncDevice) -> Option<std::net::Ipv4Addr> {
+    use tun2::AbstractDevice;
+
+    let mtu = device.mtu().unwrap_or(tun2::DEFAULT_MTU);
+
+    let address = match device.address() {
+        Ok(a) => match a {
+            IpAddr::V4(v4) => v4,
+            IpAddr::V6(_) => return None,
+        },
+        Err(_) => return None,
+    };
+
+    let netmask = match device.netmask() {
+        Ok(n) => match n {
+            IpAddr::V4(v4) => v4,
+            IpAddr::V6(_) => return None,
+        },
+        Err(_) => return None,
+    };
+
+    match smoltcp::wire::Ipv4Cidr::from_netmask(address, netmask) {
+        Ok(address_net) => match address_net.broadcast() {
+            Some(broadcast) => {
+                info!(
+                    "tun device network: {} (address: {}, netmask: {}, broadcast: {}, mtu: {})",
+                    address_net, address, netmask, broadcast, mtu,
+                );
+
+                Some(broadcast)
+            }
+            None => {
+                error!("invalid tun address {}, netmask {}", address, netmask);
+                None
+            }
+        },
+        Err(err) => {
+            error!(
+                "invalid tun address {}, netmask {}, error: {}",
+                address, netmask, err
+            );
+            None
+        }
+    }
+}

netstack-smoltcp/scripts/bench-offload.sh

@@ -0,0 +1,174 @@
+#!/usr/bin/env bash
+# bench-offload.sh
+#
+# Benchmarks netstack-smoltcp's forward examples with 2-stream iperf3.
+# Compares:
+#   - examples/forward               (tun2, no GRO/GSO offload)
+#   - examples/forward-offload-linux (tun-rs, Linux GRO/GSO offload via IFF_VNET_HDR)
+#
+# Setup: creates a veth pair + network namespace; iperf3 server runs inside
+# the namespace, the forward proxy bridges traffic through a TUN device.
+#
+# Requirements: cargo, iperf3, ip (iproute2), root/CAP_NET_ADMIN
+#
+# Usage:
+#   sudo bash scripts/bench-offload.sh
+#
+# Run from the root of the netstack-smoltcp repository.
+
+set -euo pipefail
+
+# ── config ────────────────────────────────────────────────────────────────────
+REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+NS=bench
+VETH_HOST=veth-host
+VETH_NS=veth-bench
+HOST_IP=172.19.0.1
+NS_IP=172.19.0.2
+PREFIX=24
+TUN_NAME=utun8
+TUN_IP=10.10.10.2
+IPERF_PORT=5201
+DURATION=15
+STREAMS=2
+
+# ── helpers ───────────────────────────────────────────────────────────────────
+die()     { echo "ERROR: $*" >&2; exit 1; }
+require() { command -v "$1" &>/dev/null || die "'$1' not found"; }
+
+cleanup() {
+    pkill -f "forward-" 2>/dev/null || true
+    ip netns exec "$NS" pkill iperf3 2>/dev/null || true
+    ip route del "${NS_IP}/32" dev "$TUN_NAME" 2>/dev/null || true
+    ip tuntap del dev "$TUN_NAME" mode tun 2>/dev/null || true
+    ip link del "$VETH_HOST" 2>/dev/null || true
+    ip netns del "$NS" 2>/dev/null || true
+}
+trap cleanup EXIT
+
+# ── preflight ─────────────────────────────────────────────────────────────────
+require cargo
+require iperf3
+require ip
+[[ $EUID -eq 0 ]] || die "run as root (needs CAP_NET_ADMIN for TUN + netns)"
+[[ -f "$REPO_DIR/Cargo.toml" ]] || die "run from the netstack-smoltcp repo root"
+grep -q 'name = "netstack-smoltcp"' "$REPO_DIR/Cargo.toml" \
+    || die "Cargo.toml does not look like netstack-smoltcp"
+
+# ── network setup ─────────────────────────────────────────────────────────────
+echo "[net] setting up namespace '$NS' and veth pair..."
+cleanup 2>/dev/null || true
+sleep 0.5
+
+ip netns add "$NS"
+ip link add "$VETH_HOST" type veth peer name "$VETH_NS"
+ip link set "$VETH_NS" netns "$NS"
+ip addr add "${HOST_IP}/${PREFIX}" dev "$VETH_HOST"
+ip link set "$VETH_HOST" up
+ip netns exec "$NS" ip addr add "${NS_IP}/${PREFIX}" dev "$VETH_NS"
+ip netns exec "$NS" ip link set "$VETH_NS" up
+ip netns exec "$NS" ip link set lo up
+echo "[net] ${HOST_IP} <──veth──> ${NS_IP} (ns:${NS})"
+
+# ── build: forward (tun2, no offload) ────────────────────────────────────────
+echo ""
+echo "[build] examples/forward (tun2, no GRO/GSO offload)..."
+(
+    cd "$REPO_DIR"
+    cargo build --example forward --release --quiet
+    cp target/release/examples/forward /tmp/forward-tun2
+)
+echo "[build] done → /tmp/forward-tun2"
+
+# ── build: forward-offload-linux (tun-rs, GRO/GSO offload) ───────────────────
+echo ""
+echo "[build] examples/forward-offload-linux (tun-rs, GRO/GSO offload)..."
+(
+    cd "$REPO_DIR"
+    cargo build --example forward-offload-linux --release --quiet
+    cp target/release/examples/forward-offload-linux /tmp/forward-tun-rs
+)
+echo "[build] done → /tmp/forward-tun-rs"
+
+# ── benchmark runner ──────────────────────────────────────────────────────────
+run_bench() {
+    local label="$1" binary="$2"
+
+    # clean any leftover state
+    pkill -f "forward-" 2>/dev/null || true
+    ip netns exec "$NS" pkill iperf3 2>/dev/null || true
+    ip route del "${NS_IP}/32" dev "$TUN_NAME" 2>/dev/null || true
+    ip tuntap del dev "$TUN_NAME" mode tun 2>/dev/null || true
+    sleep 0.8
+
+    # start iperf3 server inside namespace
+    ip netns exec "$NS" iperf3 -s -p "$IPERF_PORT" -D \
+        --logfile /tmp/iperf3-bench-server.log
+
+    # start proxy
+    "$binary" -i "$VETH_HOST" -n "$TUN_NAME" --log-level warn &
+    sleep 2
+
+    ip link show "$TUN_NAME" &>/dev/null \
+        || { echo "  [!] TUN not up, skipping"; return 1; }
+
+    # route iperf3 traffic through TUN (more-specific /32 overrides /24 via veth)
+    ip route add "${NS_IP}/32" dev "$TUN_NAME"
+
+    echo "  running iperf3: ${STREAMS} streams × ${DURATION}s …"
+    local out
+    out=$(iperf3 -c "$NS_IP" -p "$IPERF_PORT" \
+              -t "$DURATION" -P "$STREAMS" 2>&1)
+
+    local sender receiver
+    sender=$(echo "$out"   | grep "SUM.*sender"   | awk '{print $6, $7}')
+    receiver=$(echo "$out" | grep "SUM.*receiver" | awk '{print $6, $7}')
+
+    if [[ -z "$sender" ]]; then
+        echo "  result: FAILED"
+        echo "$out" | tail -5 | sed 's/^/    /'
+    else
+        printf "  sender:   %s\n" "$sender"
+        printf "  receiver: %s\n" "$receiver"
+    fi
+
+    pkill -f "forward-" 2>/dev/null || true
+    ip netns exec "$NS" pkill iperf3 2>/dev/null || true
+    ip route del "${NS_IP}/32" dev "$TUN_NAME" 2>/dev/null || true
+    ip tuntap del dev "$TUN_NAME" mode tun 2>/dev/null || true
+    sleep 0.8
+}
+
+# ── direct baseline ───────────────────────────────────────────────────────────
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo " BASELINE: direct veth (no TUN, no proxy)"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+ip netns exec "$NS" pkill iperf3 2>/dev/null || true; sleep 0.3
+ip netns exec "$NS" iperf3 -s -p "$IPERF_PORT" -D \
+    --logfile /tmp/iperf3-bench-server.log; sleep 0.3
+echo "  running iperf3: ${STREAMS} streams × ${DURATION}s …"
+baseline_out=$(iperf3 -c "$NS_IP" -p "$IPERF_PORT" \
+                   -t "$DURATION" -P "$STREAMS" 2>&1)
+echo "$baseline_out" | grep "SUM.*sender"   | awk '{printf "  sender:   %s %s\n", $6, $7}'
+echo "$baseline_out" | grep "SUM.*receiver" | awk '{printf "  receiver: %s %s\n", $6, $7}'
+ip netns exec "$NS" pkill iperf3 2>/dev/null || true; sleep 0.5
+
+# ── tun2 ─────────────────────────────────────────────────────────────────────
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo " tun2  (main branch — no GRO/GSO offload)"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+run_bench "tun2" /tmp/forward-tun2
+
+# ── tun-rs + offload ──────────────────────────────────────────────────────────
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo " tun-rs (patched — GRO/GSO offload via IFF_VNET_HDR)"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+run_bench "tun-rs+offload" /tmp/forward-tun-rs
+
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo " done."
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"

netstack-smoltcp/scripts/route-linux.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+#__author__: cavivie
+
+DEFAULT_TUN_NAME="utun8"
+
+function do_route() {
+    local route_op="${1}"
+    local tun_name="${2:-$DEFAULT_TUN_NAME}"
+    ip route ${route_op} 0.0.0.0/1 dev ${tun_name}
+    ip route ${route_op} 128.0.0.0/1 dev ${tun_name}
+}
+
+function usage(){
+    echo "Usage:
+    route add    add tun routes to system route table
+    route del    delete routes from system route table
+    route help   display all usages of the shell script"
+}
+
+# START MAIN-OPTIONS
+case $1 in
+    add) do_route add $2;;
+    del) do_route delete $2;;
+    *) usage ;;
+esac
+# END MAIN-OPTIONS

netstack-smoltcp/scripts/route-macos.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+#__author__: cavivie
+
+DEFAULT_TUN_ADDR="10.10.10.2/24"
+DEFAULT_TUN_DEST="10.10.10.1"
+
+function do_route() {
+    local route_op="${1}"
+    local tun_addr="${2:-$DEFAULT_TUN_ADDR}"
+    local tun_dest="${3:-$DEFAULT_TUN_DEST}"
+    sudo route ${route_op} -net 1.0.0.0/8 ${tun_dest}
+    sudo route ${route_op} -net 2.0.0.0/7 ${tun_dest}
+    sudo route ${route_op} -net 4.0.0.0/6 ${tun_dest}
+    sudo route ${route_op} -net 8.0.0.0/5 ${tun_dest}
+    sudo route ${route_op} -net 16.0.0.0/4 ${tun_dest}
+    sudo route ${route_op} -net 32.0.0.0/3 ${tun_dest}
+    sudo route ${route_op} -net 64.0.0.0/2 ${tun_dest}
+    sudo route ${route_op} -net 128.0.0.0/1 ${tun_dest}
+    # tun2 do like this automatically
+    sudo route ${route_op} -net ${tun_addr} ${tun_dest}
+}
+
+function usage(){
+    echo "Usage:
+    route add    add tun routes to system route table
+    route del    delete routes from system route table
+    route help   display all usages of the shell script"
+}
+
+# START MAIN-OPTIONS
+case $1 in
+    add) do_route add $2 $3;;
+    del) do_route delete $2 $3;;
+    *) usage ;;
+esac
+# END MAIN-OPTIONS

netstack-smoltcp/scripts/route-windows.ps1

@@ -0,0 +1,30 @@
+#__author__: cavivie
+
+param(
+    [string]$Cmd = "help",
+    [string]$TunName = "utun8",
+    [string]$TunGateway = "10.10.10.1"
+)
+
+$ErrorActionPreference = "Stop"
+
+# START MAIN-OPTIONS
+switch ($Cmd) {
+    "add" {
+        # tun2 do like this automatically
+        New-NetRoute -DestinationPrefix "0.0.0.0/1" -InterfaceAlias $TunName -NextHop "$TunGateway"
+        New-NetRoute -DestinationPrefix "128.0.0.0/1" -InterfaceAlias $TunName -NextHop "$TunGateway"
+    }
+    "del" {
+        # tun2 do like this automatically
+        Get-NetRoute -DestinationPrefix "0.0.0.0/1" -InterfaceAlias $TunName | Remove-NetRoute
+        Get-NetRoute -DestinationPrefix "128.0.0.0/1" -InterfaceAlias $TunName | Remove-NetRoute
+    }
+    default {
+        Write-Host "Usage:
+    route add    add tun routes to system route table
+    route del    delete routes from system route table
+    route help   display all usages of the shell script"
+    }
+}
+# END MAIN-OPTIONS

netstack-smoltcp/src/device.rs

@@ -0,0 +1,109 @@
+use std::sync::{
+    atomic::{AtomicBool, Ordering},
+    Arc,
+};
+
+use smoltcp::{
+    phy::{Device, DeviceCapabilities, Medium, RxToken, TxToken},
+    time::Instant,
+};
+use tokio::sync::mpsc::{unbounded_channel, Permit, Sender, UnboundedReceiver, UnboundedSender};
+
+use crate::packet::AnyIpPktFrame;
+
+pub(super) struct VirtualDevice {
+    in_buf_avail: Arc<AtomicBool>,
+    in_buf: UnboundedReceiver<Vec<u8>>,
+    out_buf: Sender<AnyIpPktFrame>,
+    mtu: usize,
+    cached_packet: Option<Vec<u8>>,
+}
+
+impl VirtualDevice {
+    pub(super) fn new(
+        iface_egress_tx: Sender<AnyIpPktFrame>,
+        mtu: usize,
+    ) -> (Self, UnboundedSender<Vec<u8>>, Arc<AtomicBool>) {
+        let iface_ingress_tx_avail = Arc::new(AtomicBool::new(false));
+        let (iface_ingress_tx, iface_ingress_rx) = unbounded_channel();
+        (
+            Self {
+                in_buf_avail: iface_ingress_tx_avail.clone(),
+                in_buf: iface_ingress_rx,
+                out_buf: iface_egress_tx,
+                mtu,
+                cached_packet: None,
+            },
+            iface_ingress_tx,
+            iface_ingress_tx_avail,
+        )
+    }
+}
+
+impl Device for VirtualDevice {
+    type RxToken<'a> = VirtualRxToken;
+    type TxToken<'a> = VirtualTxToken<'a>;
+
+    fn receive(&mut self, _timestamp: Instant) -> Option<(Self::RxToken<'_>, Self::TxToken<'_>)> {
+        let buffer = if let Some(buf) = self.cached_packet.take() {
+            buf
+        } else {
+            let Ok(buf) = self.in_buf.try_recv() else {
+                self.in_buf_avail.store(false, Ordering::Release);
+                return None;
+            };
+            buf
+        };
+
+        let Ok(permit) = self.out_buf.try_reserve() else {
+            self.cached_packet = Some(buffer);
+            self.in_buf_avail.store(false, Ordering::Release);
+            return None;
+        };
+
+        Some((Self::RxToken { buffer }, Self::TxToken { permit }))
+    }
+
+    fn transmit(&mut self, _timestamp: Instant) -> Option<Self::TxToken<'_>> {
+        match self.out_buf.try_reserve() {
+            Ok(permit) => Some(Self::TxToken { permit }),
+            Err(_) => None,
+        }
+    }
+
+    fn capabilities(&self) -> DeviceCapabilities {
+        let mut capabilities = DeviceCapabilities::default();
+        capabilities.medium = Medium::Ip;
+        capabilities.max_transmission_unit = self.mtu;
+        capabilities
+    }
+}
+
+pub(super) struct VirtualRxToken {
+    buffer: Vec<u8>,
+}
+
+impl RxToken for VirtualRxToken {
+    fn consume<R, F>(self, f: F) -> R
+    where
+        F: FnOnce(&[u8]) -> R,
+    {
+        f(&self.buffer[..])
+    }
+}
+
+pub(super) struct VirtualTxToken<'a> {
+    permit: Permit<'a, Vec<u8>>,
+}
+
+impl<'a> TxToken for VirtualTxToken<'a> {
+    fn consume<R, F>(self, len: usize, f: F) -> R
+    where
+        F: FnOnce(&mut [u8]) -> R,
+    {
+        let mut buffer = vec![0u8; len];
+        let result = f(&mut buffer);
+        self.permit.send(buffer);
+        result
+    }
+}

netstack-smoltcp/src/filter.rs

@@ -0,0 +1,56 @@
+use std::net::IpAddr;
+
+pub type IpFilter<'a> = Box<dyn Fn(&IpAddr, &IpAddr) -> bool + Send + Sync + 'a>;
+
+pub struct IpFilters<'a> {
+    filters: Vec<IpFilter<'a>>,
+}
+
+impl<'a> Default for IpFilters<'a> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<'a> IpFilters<'a> {
+    pub fn new() -> Self {
+        Self {
+            filters: Default::default(),
+        }
+    }
+
+    pub fn with_non_broadcast() -> Self {
+        macro_rules! non_broadcast {
+            ($addr:ident) => {
+                match $addr {
+                    IpAddr::V4(a) => !(a.is_broadcast() || a.is_multicast() || a.is_unspecified()),
+                    IpAddr::V6(a) => !(a.is_multicast() || a.is_unspecified()),
+                }
+            };
+        }
+        Self {
+            filters: vec![Box::new(|src, dst| {
+                non_broadcast!(src) && non_broadcast!(dst)
+            })],
+        }
+    }
+
+    pub fn add(&mut self, filter: IpFilter<'a>) {
+        self.filters.push(filter);
+    }
+
+    pub fn add_fn<F>(&mut self, filter: F)
+    where
+        F: Fn(&IpAddr, &IpAddr) -> bool + Send + Sync + 'a,
+    {
+        self.filters.push(Box::new(filter));
+    }
+
+    pub fn add_all<I: IntoIterator<Item = IpFilter<'a>>>(&mut self, filters: I) {
+        self.filters.extend(filters);
+    }
+
+    pub fn is_allowed(&self, src: &IpAddr, dst: &IpAddr) -> bool {
+        self.filters.iter().all(|filter| filter(src, dst))
+    }
+}

netstack-smoltcp/src/lib.rs

@@ -0,0 +1,22 @@
+mod device;
+
+mod runner;
+pub use runner::Runner;
+
+mod packet;
+pub use packet::AnyIpPktFrame;
+
+mod filter;
+pub use filter::{IpFilter, IpFilters};
+
+pub mod udp;
+pub use udp::UdpSocket;
+
+pub mod tcp;
+pub use tcp::{TcpListener, TcpStream};
+
+pub mod stack;
+pub use stack::{Stack, StackBuilder};
+
+/// Re-export
+pub use smoltcp;

netstack-smoltcp/src/packet.rs

@@ -0,0 +1,53 @@
+use std::net::IpAddr;
+
+use smoltcp::wire::{IpProtocol, IpVersion, Ipv4Packet, Ipv6Packet};
+
+pub type AnyIpPktFrame = Vec<u8>;
+
+#[derive(Debug)]
+pub(super) enum IpPacket<T: AsRef<[u8]>> {
+    Ipv4(Ipv4Packet<T>),
+    Ipv6(Ipv6Packet<T>),
+}
+
+impl<T: AsRef<[u8]> + Copy> IpPacket<T> {
+    pub fn new_checked(packet: T) -> smoltcp::wire::Result<IpPacket<T>> {
+        let buffer = packet.as_ref();
+        match IpVersion::of_packet(buffer)? {
+            IpVersion::Ipv4 => Ok(IpPacket::Ipv4(Ipv4Packet::new_checked(packet)?)),
+            IpVersion::Ipv6 => Ok(IpPacket::Ipv6(Ipv6Packet::new_checked(packet)?)),
+        }
+    }
+
+    pub fn src_addr(&self) -> IpAddr {
+        match *self {
+            IpPacket::Ipv4(ref packet) => IpAddr::from(packet.src_addr()),
+            IpPacket::Ipv6(ref packet) => IpAddr::from(packet.src_addr()),
+        }
+    }
+
+    pub fn dst_addr(&self) -> IpAddr {
+        match *self {
+            IpPacket::Ipv4(ref packet) => IpAddr::from(packet.dst_addr()),
+            IpPacket::Ipv6(ref packet) => IpAddr::from(packet.dst_addr()),
+        }
+    }
+
+    pub fn protocol(&self) -> IpProtocol {
+        match *self {
+            IpPacket::Ipv4(ref packet) => packet.next_header(),
+            IpPacket::Ipv6(ref packet) => packet.next_header(),
+        }
+    }
+}
+
+impl<'a, T: AsRef<[u8]> + ?Sized> IpPacket<&'a T> {
+    /// Return a pointer to the payload.
+    #[inline]
+    pub fn payload(&self) -> &'a [u8] {
+        match *self {
+            IpPacket::Ipv4(ref packet) => packet.payload(),
+            IpPacket::Ipv6(ref packet) => packet.payload(),
+        }
+    }
+}

netstack-smoltcp/src/runner.rs

@@ -0,0 +1,42 @@
+use std::{
+    future::{Future, IntoFuture},
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+/// BoxFuture acts the same as the [BoxFuture in crate futures utils],
+/// which is an owned dynamically typed Future for use in cases where you
+/// can’t statically type your result or need to add some indirection.
+/// But the difference of this structure is that it will conditionally
+/// implement Send according to the properties of type T, which does not
+/// require two sets of API interfaces in single-threaded and multi-threaded.
+///
+/// [BoxFuture in crate futures utils]: https://docs.rs/futures-util/latest/futures_util/future/type.BoxFuture.html
+pub struct BoxFuture<'a, T>(Pin<Box<dyn Future<Output = T> + Send + 'a>>);
+
+impl<'a, T> BoxFuture<'a, T> {
+    pub fn new<F>(f: F) -> BoxFuture<'a, T>
+    where
+        F: IntoFuture<Output = T> + Send + 'a,
+        F::IntoFuture: Send + 'a,
+    {
+        BoxFuture(Box::pin(f.into_future()))
+    }
+
+    #[allow(unused)]
+    pub fn wrap(f: Pin<Box<dyn Future<Output = T> + Send + 'a>>) -> BoxFuture<'a, T> {
+        BoxFuture(f)
+    }
+}
+
+
+
+impl<T> Future for BoxFuture<'_, T> {
+    type Output = T;
+
+    fn poll(mut self: Pin<&mut Self>, context: &mut Context<'_>) -> Poll<Self::Output> {
+        self.0.as_mut().poll(context)
+    }
+}
+
+pub type Runner = BoxFuture<'static, std::io::Result<()>>;

netstack-smoltcp/src/stack.rs

@@ -0,0 +1,279 @@
+use std::{
+    net::IpAddr,
+    pin::Pin,
+    task::{ready, Context, Poll},
+};
+
+use futures::{Sink, Stream};
+use smoltcp::wire::IpProtocol;
+use tokio::sync::mpsc::{channel, Receiver};
+use tokio_util::sync::PollSender;
+use tracing::{debug, trace};
+
+use crate::{
+    filter::{IpFilter, IpFilters},
+    packet::{AnyIpPktFrame, IpPacket},
+    runner::Runner,
+    tcp::TcpListener,
+    udp::UdpSocket,
+};
+
+pub struct StackBuilder {
+    enable_udp: bool,
+    enable_tcp: bool,
+    enable_icmp: bool,
+    stack_buffer_size: usize,
+    udp_buffer_size: usize,
+    tcp_buffer_size: usize,
+    mtu: usize,
+    ip_filters: IpFilters<'static>,
+}
+
+impl Default for StackBuilder {
+    fn default() -> Self {
+        Self {
+            enable_udp: false,
+            enable_tcp: false,
+            enable_icmp: false,
+            stack_buffer_size: 1024,
+            udp_buffer_size: 512,
+            tcp_buffer_size: 512,
+            mtu: 1504, // 1500 for Ethernet + 4 for VLAN
+            ip_filters: IpFilters::with_non_broadcast(),
+        }
+    }
+}
+
+#[allow(unused)]
+impl StackBuilder {
+    pub fn enable_udp(mut self, enable: bool) -> Self {
+        self.enable_udp = enable;
+        self
+    }
+
+    pub fn enable_tcp(mut self, enable: bool) -> Self {
+        self.enable_tcp = enable;
+        self
+    }
+
+    pub fn enable_icmp(mut self, enable: bool) -> Self {
+        self.enable_icmp = enable;
+        self
+    }
+
+    pub fn stack_buffer_size(mut self, size: usize) -> Self {
+        self.stack_buffer_size = size;
+        self
+    }
+
+    pub fn udp_buffer_size(mut self, size: usize) -> Self {
+        self.udp_buffer_size = size;
+        self
+    }
+
+    pub fn tcp_buffer_size(mut self, size: usize) -> Self {
+        self.tcp_buffer_size = size;
+        self
+    }
+
+    pub fn set_ip_filters(mut self, filters: IpFilters<'static>) -> Self {
+        self.ip_filters = filters;
+        self
+    }
+
+    pub fn add_ip_filter(mut self, filter: IpFilter<'static>) -> Self {
+        self.ip_filters.add(filter);
+        self
+    }
+
+    pub fn add_ip_filter_fn<F>(mut self, filter: F) -> Self
+    where
+        F: Fn(&IpAddr, &IpAddr) -> bool + Send + Sync + 'static,
+    {
+        self.ip_filters.add_fn(filter);
+        self
+    }
+
+    pub fn mtu(mut self, mtu: usize) -> Self {
+        self.mtu = mtu;
+        self
+    }
+
+    #[allow(clippy::type_complexity)]
+    pub fn build(
+        self,
+    ) -> std::io::Result<(
+        Stack,
+        Option<Runner>,
+        Option<UdpSocket>,
+        Option<TcpListener>,
+    )> {
+        let (stack_tx, stack_rx) = channel(self.stack_buffer_size);
+
+        let (udp_tx, udp_rx) = if self.enable_udp {
+            let (udp_tx, udp_rx) = channel(self.udp_buffer_size);
+            (Some(PollSender::new(udp_tx)), Some(udp_rx))
+        } else {
+            (None, None)
+        };
+
+        let (tcp_tx, tcp_rx) = if self.enable_tcp {
+            let (tcp_tx, tcp_rx) = channel(self.tcp_buffer_size);
+            (Some(PollSender::new(tcp_tx)), Some(tcp_rx))
+        } else {
+            (None, None)
+        };
+
+        // ICMP is handled by TCP's Interface.
+        // smoltcp's interface will always send replies to EchoRequest
+        if self.enable_icmp && !self.enable_tcp {
+            use std::io::{Error, ErrorKind::InvalidInput};
+            return Err(Error::new(InvalidInput, "ICMP requires TCP"));
+        }
+        let icmp_tx = if self.enable_icmp {
+            tcp_tx.clone()
+        } else {
+            None
+        };
+
+        let udp_socket = udp_rx.map(|udp_rx| UdpSocket::new(udp_rx, stack_tx.clone()));
+
+        let (tcp_runner, tcp_listener) = if let Some(tcp_rx) = tcp_rx {
+            let (tcp_runner, tcp_listener) = TcpListener::new(tcp_rx, stack_tx, self.mtu)?;
+            (Some(tcp_runner), Some(tcp_listener))
+        } else {
+            (None, None)
+        };
+
+        let stack = Stack {
+            ip_filters: self.ip_filters,
+            stack_rx,
+            sink_buf: None,
+            udp_tx,
+            tcp_tx,
+            icmp_tx,
+        };
+
+        Ok((stack, tcp_runner, udp_socket, tcp_listener))
+    }
+}
+
+pub struct Stack {
+    ip_filters: IpFilters<'static>,
+    sink_buf: Option<(AnyIpPktFrame, IpProtocol)>,
+    udp_tx: Option<PollSender<AnyIpPktFrame>>,
+    tcp_tx: Option<PollSender<AnyIpPktFrame>>,
+    icmp_tx: Option<PollSender<AnyIpPktFrame>>,
+    stack_rx: Receiver<AnyIpPktFrame>,
+}
+
+impl Stack {
+    fn poll_send(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), std::io::Error>> {
+        let (item, proto) = match self.sink_buf.take() {
+            Some(val) => val,
+            None => return Poll::Ready(Ok(())),
+        };
+
+        let tx = match proto {
+            IpProtocol::Tcp => self.tcp_tx.as_mut(),
+            IpProtocol::Udp => self.udp_tx.as_mut(),
+            IpProtocol::Icmp | IpProtocol::Icmpv6 => self.icmp_tx.as_mut(),
+            _ => unreachable!(),
+        };
+
+        let Some(tx) = tx else {
+            return Poll::Ready(Ok(()));
+        };
+
+        match tx.poll_reserve(cx) {
+            Poll::Pending => {
+                self.sink_buf = Some((item, proto));
+                Poll::Pending
+            }
+            Poll::Ready(Err(_)) => Poll::Ready(Err(channel_closed_err("channel is closed"))),
+            Poll::Ready(Ok(_)) => match tx.send_item(item) {
+                Ok(()) => Poll::Ready(Ok(())),
+                Err(_) => Poll::Ready(Err(channel_closed_err("channel is closed"))),
+            },
+        }
+    }
+}
+
+// Recv from stack.
+impl Stream for Stack {
+    type Item = std::io::Result<AnyIpPktFrame>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        match self.stack_rx.poll_recv(cx) {
+            Poll::Ready(Some(pkt)) => Poll::Ready(Some(Ok(pkt))),
+            Poll::Ready(None) => Poll::Ready(None),
+            Poll::Pending => Poll::Pending,
+        }
+    }
+}
+
+// Send to stack.
+impl Sink<AnyIpPktFrame> for Stack {
+    type Error = std::io::Error;
+
+    fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        // If a buffered item exists, try to flush it first. This also properly
+        // registers the waker via poll_reserve so we get woken when the channel
+        // has capacity. Without this, returning Pending here with _cx unused
+        // means the task never gets rescheduled.
+        if self.sink_buf.is_some() {
+            ready!(self.poll_send(cx))?;
+        }
+        Poll::Ready(Ok(()))
+    }
+
+    fn start_send(mut self: Pin<&mut Self>, item: AnyIpPktFrame) -> Result<(), Self::Error> {
+        if item.is_empty() {
+            return Ok(());
+        }
+
+        use std::io::{Error, ErrorKind::InvalidInput};
+        let packet = IpPacket::new_checked(item.as_slice())
+            .map_err(|err| Error::new(InvalidInput, format!("invalid IP packet: {err}")))?;
+
+        let src_ip = packet.src_addr();
+        let dst_ip = packet.dst_addr();
+
+        let addr_allowed = self.ip_filters.is_allowed(&src_ip, &dst_ip);
+        if !addr_allowed {
+            trace!("IP packet {src_ip} -> {dst_ip} (allowed? {addr_allowed}) throwing away",);
+            return Ok(());
+        }
+
+        let protocol = packet.protocol();
+        if matches!(
+            protocol,
+            IpProtocol::Tcp | IpProtocol::Udp | IpProtocol::Icmp | IpProtocol::Icmpv6
+        ) {
+            self.sink_buf.replace((item, protocol));
+        } else {
+            debug!("tun IP packet ignored (protocol: {:?})", protocol);
+        }
+
+        Ok(())
+    }
+
+    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.poll_send(cx)
+    }
+
+    fn poll_close(
+        mut self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Result<(), Self::Error>> {
+        self.stack_rx.close();
+        Poll::Ready(Ok(()))
+    }
+}
+
+fn channel_closed_err<E>(err: E) -> std::io::Error
+where
+    E: Into<Box<dyn std::error::Error + Send + Sync>>,
+{
+    std::io::Error::new(std::io::ErrorKind::BrokenPipe, err)
+}

netstack-smoltcp/src/tcp.rs

@@ -0,0 +1,564 @@
+use std::{
+    collections::HashMap,
+    net::SocketAddr,
+    pin::Pin,
+    sync::{
+        atomic::{AtomicBool, Ordering},
+        Arc,
+    },
+    task::{Context, Poll, Waker},
+};
+
+use futures::Stream;
+use smoltcp::{
+    iface::{Config as InterfaceConfig, Interface, SocketHandle, SocketSet},
+    phy::Device,
+    socket::tcp::{Socket as TcpSocket, SocketBuffer as TcpSocketBuffer, State as TcpState},
+    storage::RingBuffer,
+    time::{Duration, Instant},
+    wire::{HardwareAddress, IpAddress, IpCidr, IpProtocol, Ipv4Address, Ipv6Address, TcpPacket},
+};
+use spin::Mutex as SpinMutex;
+use tokio::{
+    io::{AsyncRead, AsyncWrite, ReadBuf},
+    sync::{
+        mpsc::{channel, Receiver, Sender, UnboundedSender},
+        Notify,
+    },
+};
+use tracing::{error, trace};
+
+use crate::{
+    device::VirtualDevice,
+    packet::{AnyIpPktFrame, IpPacket},
+    Runner,
+};
+
+// Reduced buffer sizes to 16KB to prevent excessive memory overhead (was 0x3FFF * 20 = 327KB per buffer)
+const DEFAULT_TCP_SEND_BUFFER_SIZE: u32 = 16384;
+const DEFAULT_TCP_RECV_BUFFER_SIZE: u32 = 16384;
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+enum TcpSocketState {
+    Normal,
+    Close,
+    Closing,
+    Closed,
+}
+
+struct TcpSocketControl {
+    send_buffer: RingBuffer<'static, u8>,
+    send_waker: Option<Waker>,
+    recv_buffer: RingBuffer<'static, u8>,
+    recv_waker: Option<Waker>,
+    recv_state: TcpSocketState,
+    send_state: TcpSocketState,
+}
+
+struct TcpSocketCreation {
+    control: SharedControl,
+    socket: TcpSocket<'static>,
+}
+
+type SharedNotify = Arc<Notify>;
+type SharedControl = Arc<SpinMutex<TcpSocketControl>>;
+
+struct TcpListenerRunner;
+
+impl TcpListenerRunner {
+    fn create(
+        device: VirtualDevice,
+        iface: Interface,
+        iface_ingress_tx: UnboundedSender<Vec<u8>>,
+        iface_ingress_tx_avail: Arc<AtomicBool>,
+        tcp_rx: Receiver<AnyIpPktFrame>,
+        stream_tx: Sender<TcpStream>,
+        sockets: HashMap<SocketHandle, SharedControl>,
+    ) -> Runner {
+        Runner::new(async move {
+            let notify = Arc::new(Notify::new());
+            let (socket_tx, socket_rx) = channel::<TcpSocketCreation>(1024);
+            let res = tokio::select! {
+                v = Self::handle_packet(notify.clone(), iface_ingress_tx, iface_ingress_tx_avail.clone(), tcp_rx, stream_tx, socket_tx) => v,
+                v = Self::handle_socket(notify, device, iface, iface_ingress_tx_avail, sockets, socket_rx) => v,
+            };
+            res?;
+            trace!("VirtDevice::poll thread exited");
+            Ok(())
+        })
+    }
+
+    async fn handle_packet(
+        notify: SharedNotify,
+        iface_ingress_tx: UnboundedSender<Vec<u8>>,
+        iface_ingress_tx_avail: Arc<AtomicBool>,
+        mut tcp_rx: Receiver<AnyIpPktFrame>,
+        stream_tx: Sender<TcpStream>,
+        socket_tx: Sender<TcpSocketCreation>,
+    ) -> std::io::Result<()> {
+        while let Some(frame) = tcp_rx.recv().await {
+            let packet = match IpPacket::new_checked(frame.as_slice()) {
+                Ok(p) => p,
+                Err(err) => {
+                    error!("invalid TCP IP packet: {:?}", err,);
+                    continue;
+                }
+            };
+
+            // Specially handle icmp packet by TCP interface.
+            if matches!(packet.protocol(), IpProtocol::Icmp | IpProtocol::Icmpv6) {
+                iface_ingress_tx
+                    .send(frame)
+                    .map_err(|e| std::io::Error::new(std::io::ErrorKind::BrokenPipe, e))?;
+                iface_ingress_tx_avail.store(true, Ordering::Release);
+                notify.notify_one();
+                continue;
+            }
+
+            let src_ip = packet.src_addr();
+            let dst_ip = packet.dst_addr();
+            let payload = packet.payload();
+
+            let packet = match TcpPacket::new_checked(payload) {
+                Ok(p) => p,
+                Err(err) => {
+                    error!("invalid TCP err: {err}, src_ip: {src_ip}, dst_ip: {dst_ip}, payload: {payload:?}");
+                    continue;
+                }
+            };
+            let src_port = packet.src_port();
+            let dst_port = packet.dst_port();
+
+            let src_addr = SocketAddr::new(src_ip, src_port);
+            let dst_addr = SocketAddr::new(dst_ip, dst_port);
+
+            // TCP first handshake packet, create a new Connection
+            if packet.syn() && !packet.ack() {
+                let mut socket = TcpSocket::new(
+                    TcpSocketBuffer::new(vec![0u8; DEFAULT_TCP_RECV_BUFFER_SIZE as usize]),
+                    TcpSocketBuffer::new(vec![0u8; DEFAULT_TCP_SEND_BUFFER_SIZE as usize]),
+                );
+                socket.set_keep_alive(Some(Duration::from_secs(28)));
+                // FIXME: It should follow system's setting. 7200 is Linux's default.
+                socket.set_timeout(Some(Duration::from_secs(7200)));
+                // NO ACK delay
+                // socket.set_ack_delay(None);
+
+                if let Err(err) = socket.listen(dst_addr) {
+                    error!("listen error: {:?}", err);
+                    continue;
+                }
+
+                trace!("created TCP connection for {} <-> {}", src_addr, dst_addr);
+
+                let control = Arc::new(SpinMutex::new(TcpSocketControl {
+                    send_buffer: RingBuffer::new(vec![0u8; DEFAULT_TCP_SEND_BUFFER_SIZE as usize]),
+                    send_waker: None,
+                    recv_buffer: RingBuffer::new(vec![0u8; DEFAULT_TCP_RECV_BUFFER_SIZE as usize]),
+                    recv_waker: None,
+                    recv_state: TcpSocketState::Normal,
+                    send_state: TcpSocketState::Normal,
+                }));
+
+                if let Err(_) = stream_tx.try_send(TcpStream {
+                    src_addr,
+                    dst_addr,
+                    notify: notify.clone(),
+                    control: control.clone(),
+                }) {
+                    error!("stream_tx full or dropped, dropping SYN from {}", src_addr);
+                    continue;
+                }
+                
+                if let Err(_) = socket_tx.try_send(TcpSocketCreation { control, socket }) {
+                    error!("socket_tx full or dropped, dropping SYN from {}", src_addr);
+                    continue;
+                }
+            }
+
+            // Pipeline tcp stream packet
+            iface_ingress_tx
+                .send(frame)
+                .map_err(|e| std::io::Error::new(std::io::ErrorKind::BrokenPipe, e))?;
+            iface_ingress_tx_avail.store(true, Ordering::Release);
+            notify.notify_one();
+        }
+        Ok(())
+    }
+
+    async fn handle_socket(
+        notify: SharedNotify,
+        mut device: VirtualDevice,
+        mut iface: Interface,
+        iface_ingress_tx_avail: Arc<AtomicBool>,
+        mut sockets: HashMap<SocketHandle, SharedControl>,
+        mut socket_rx: Receiver<TcpSocketCreation>,
+    ) -> std::io::Result<()> {
+        let mut socket_set = SocketSet::new(vec![]);
+        loop {
+            while let Ok(TcpSocketCreation { control, socket }) = socket_rx.try_recv() {
+                let handle = socket_set.add(socket);
+                sockets.insert(handle, control);
+            }
+
+            let before_poll = Instant::now();
+            let updated_sockets = iface.poll(before_poll, &mut device, &mut socket_set);
+            if matches!(
+                updated_sockets,
+                smoltcp::iface::PollResult::SocketStateChanged
+            ) {
+                trace!("VirtDevice::poll costed {}", Instant::now() - before_poll);
+            }
+
+            // Check all the sockets' status
+            let mut sockets_to_remove = Vec::new();
+
+            for (socket_handle, control) in sockets.iter() {
+                let socket_handle = *socket_handle;
+                let socket = socket_set.get_mut::<TcpSocket>(socket_handle);
+                let mut control = control.lock();
+
+                // Remove the socket only when it is in the closed state.
+                if socket.state() == TcpState::Closed {
+                    sockets_to_remove.push(socket_handle);
+
+                    control.send_state = TcpSocketState::Closed;
+                    control.recv_state = TcpSocketState::Closed;
+
+                    if let Some(waker) = control.send_waker.take() {
+                        waker.wake();
+                    }
+                    if let Some(waker) = control.recv_waker.take() {
+                        waker.wake();
+                    }
+
+                    trace!("closed TCP connection");
+                    continue;
+                }
+
+                // SHUT_WR — only close once the send_buffer has been fully
+                // drained into the smoltcp socket.  Closing earlier transitions
+                // the socket to FIN_WAIT_1, making can_send() return false, so
+                // the send loop below never runs and the remaining data is lost.
+                if matches!(control.send_state, TcpSocketState::Close)
+                    && control.send_buffer.is_empty()
+                {
+                    trace!("closing TCP Write Half, {:?}", socket.state());
+
+                    socket.close();
+                    control.send_state = TcpSocketState::Closing;
+                }
+
+                // Check if readable
+                let mut wake_receiver = false;
+                while socket.can_recv() && !control.recv_buffer.is_full() {
+                    let result = socket.recv(|buffer| {
+                        let n = control.recv_buffer.enqueue_slice(buffer);
+                        (n, ())
+                    });
+
+                    match result {
+                        Ok(..) => wake_receiver = true,
+                        Err(err) => {
+                            error!("socket recv error: {:?}, {:?}", err, socket.state());
+
+                            // Don't know why. Abort the connection.
+                            socket.abort();
+
+                            if matches!(control.recv_state, TcpSocketState::Normal) {
+                                control.recv_state = TcpSocketState::Closed;
+                            }
+                            wake_receiver = true;
+
+                            // The socket will be recycled in the next poll.
+                            break;
+                        }
+                    }
+                }
+
+                // If socket is not in ESTABLISH, FIN-WAIT-1, FIN-WAIT-2,
+                // the local client have closed our receiver.
+                let states = [
+                    TcpState::Listen,
+                    TcpState::SynReceived,
+                    TcpState::Established,
+                    TcpState::FinWait1,
+                    TcpState::FinWait2,
+                ];
+                if matches!(control.recv_state, TcpSocketState::Normal)
+                    && !socket.may_recv()
+                    && !states.contains(&socket.state())
+                {
+                    trace!("closed TCP Read Half, {:?}", socket.state());
+
+                    // Let TcpStream::poll_read returns EOF.
+                    control.recv_state = TcpSocketState::Closed;
+                    wake_receiver = true;
+                }
+
+                if wake_receiver && control.recv_waker.is_some() {
+                    if let Some(waker) = control.recv_waker.take() {
+                        waker.wake();
+                    }
+                }
+
+                // Check if writable
+                let mut wake_sender = false;
+                while socket.can_send() && !control.send_buffer.is_empty() {
+                    let result = socket.send(|buffer| {
+                        let n = control.send_buffer.dequeue_slice(buffer);
+                        (n, ())
+                    });
+
+                    match result {
+                        Ok(..) => wake_sender = true,
+                        Err(err) => {
+                            error!("socket send error: {:?}, {:?}", err, socket.state());
+
+                            // Don't know why. Abort the connection.
+                            socket.abort();
+
+                            if matches!(control.send_state, TcpSocketState::Normal) {
+                                control.send_state = TcpSocketState::Closed;
+                            }
+                            wake_sender = true;
+
+                            // The socket will be recycled in the next poll.
+                            break;
+                        }
+                    }
+                }
+
+                if wake_sender && control.send_waker.is_some() {
+                    if let Some(waker) = control.send_waker.take() {
+                        waker.wake();
+                    }
+                }
+            }
+
+            for socket_handle in sockets_to_remove {
+                sockets.remove(&socket_handle);
+                socket_set.remove(socket_handle);
+            }
+
+            if !iface_ingress_tx_avail.load(Ordering::Acquire) {
+                let next_duration = iface
+                    .poll_delay(before_poll, &socket_set)
+                    .unwrap_or(Duration::from_millis(5));
+                if next_duration != Duration::ZERO {
+                    let _ = tokio::time::timeout(
+                        tokio::time::Duration::from(next_duration),
+                        notify.notified(),
+                    )
+                    .await;
+                }
+            }
+        }
+    }
+}
+
+pub struct TcpListener {
+    stream_rx: Receiver<TcpStream>,
+}
+
+impl TcpListener {
+    pub(super) fn new(
+        tcp_rx: Receiver<AnyIpPktFrame>,
+        stack_tx: Sender<AnyIpPktFrame>,
+        mtu: usize,
+    ) -> std::io::Result<(Runner, Self)> {
+        let (mut device, iface_ingress_tx, iface_ingress_tx_avail) =
+            VirtualDevice::new(stack_tx, mtu);
+        let iface = Self::create_interface(&mut device)?;
+
+        let (stream_tx, stream_rx) = channel(1024);
+
+        let runner = TcpListenerRunner::create(
+            device,
+            iface,
+            iface_ingress_tx,
+            iface_ingress_tx_avail,
+            tcp_rx,
+            stream_tx,
+            HashMap::new(),
+        );
+
+        Ok((runner, Self { stream_rx }))
+    }
+
+    fn create_interface<D>(device: &mut D) -> std::io::Result<Interface>
+    where
+        D: Device + ?Sized,
+    {
+        let mut iface_config = InterfaceConfig::new(HardwareAddress::Ip);
+        iface_config.random_seed = rand::random();
+        let mut iface = Interface::new(iface_config, device, Instant::now());
+        iface.update_ip_addrs(|ip_addrs| {
+            ip_addrs
+                .push(IpCidr::new(IpAddress::v4(0, 0, 0, 1), 0))
+                .expect("iface IPv4");
+            ip_addrs
+                .push(IpCidr::new(IpAddress::v6(0, 0, 0, 0, 0, 0, 0, 1), 0))
+                .expect("iface IPv6");
+        });
+        iface
+            .routes_mut()
+            .add_default_ipv4_route(Ipv4Address::new(0, 0, 0, 1))
+            .map_err(|e| std::io::Error::new(std::io::ErrorKind::AddrNotAvailable, e))?;
+        iface
+            .routes_mut()
+            .add_default_ipv6_route(Ipv6Address::new(0, 0, 0, 0, 0, 0, 0, 1))
+            .map_err(|e| std::io::Error::new(std::io::ErrorKind::AddrNotAvailable, e))?;
+        iface.set_any_ip(true);
+        Ok(iface)
+    }
+}
+
+impl Stream for TcpListener {
+    type Item = (TcpStream, SocketAddr, SocketAddr);
+
+    fn poll_next(
+        mut self: std::pin::Pin<&mut Self>,
+        cx: &mut std::task::Context<'_>,
+    ) -> std::task::Poll<Option<Self::Item>> {
+        self.stream_rx.poll_recv(cx).map(|stream| {
+            stream.map(|stream| {
+                let local_addr = *stream.local_addr();
+                let remote_addr: SocketAddr = *stream.remote_addr();
+                (stream, local_addr, remote_addr)
+            })
+        })
+    }
+}
+
+pub struct TcpStream {
+    src_addr: SocketAddr,
+    dst_addr: SocketAddr,
+    notify: SharedNotify,
+    control: SharedControl,
+}
+
+impl Drop for TcpStream {
+    fn drop(&mut self) {
+        let mut control = self.control.lock();
+
+        if matches!(control.recv_state, TcpSocketState::Normal) {
+            control.recv_state = TcpSocketState::Close;
+        }
+
+        if matches!(control.send_state, TcpSocketState::Normal) {
+            control.send_state = TcpSocketState::Close;
+        }
+
+        self.notify.notify_one();
+    }
+}
+
+impl TcpStream {
+    pub fn local_addr(&self) -> &SocketAddr {
+        &self.src_addr
+    }
+
+    pub fn remote_addr(&self) -> &SocketAddr {
+        &self.dst_addr
+    }
+}
+
+impl AsyncRead for TcpStream {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<std::io::Result<()>> {
+        let mut control = self.control.lock();
+
+        // Read from buffer
+        if control.recv_buffer.is_empty() {
+            // If socket is already closed / half closed, just return EOF directly.
+            if matches!(control.recv_state, TcpSocketState::Closed) {
+                return Ok(()).into();
+            }
+
+            // Nothing could be read. Wait for notify.
+            if let Some(old_waker) = control.recv_waker.replace(cx.waker().clone()) {
+                if !old_waker.will_wake(cx.waker()) {
+                    old_waker.wake();
+                }
+            }
+
+            return Poll::Pending;
+        }
+
+        let recv_buf = buf.initialize_unfilled();
+        let n = control.recv_buffer.dequeue_slice(recv_buf);
+        buf.advance(n);
+
+        if n > 0 {
+            self.notify.notify_one();
+        }
+
+        Ok(()).into()
+    }
+}
+
+impl AsyncWrite for TcpStream {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<std::io::Result<usize>> {
+        let mut control = self.control.lock();
+
+        // If state == Close | Closing | Closed, the TCP stream WR half is closed.
+        if !matches!(control.send_state, TcpSocketState::Normal) {
+            return Err(std::io::ErrorKind::BrokenPipe.into()).into();
+        }
+
+        // Write to buffer
+
+        if control.send_buffer.is_full() {
+            if let Some(old_waker) = control.send_waker.replace(cx.waker().clone()) {
+                if !old_waker.will_wake(cx.waker()) {
+                    old_waker.wake();
+                }
+            }
+
+            return Poll::Pending;
+        }
+
+        let n = control.send_buffer.enqueue_slice(buf);
+
+        if n > 0 {
+            self.notify.notify_one();
+        }
+
+        Ok(n).into()
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
+        Ok(()).into()
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
+        let mut control = self.control.lock();
+
+        if matches!(control.send_state, TcpSocketState::Closed | TcpSocketState::Closing) {
+            return Ok(()).into();
+        }
+
+        // SHUT_WR
+        if matches!(control.send_state, TcpSocketState::Normal) {
+            control.send_state = TcpSocketState::Close;
+        }
+
+        if let Some(old_waker) = control.send_waker.replace(cx.waker().clone()) {
+            if !old_waker.will_wake(cx.waker()) {
+                old_waker.wake();
+            }
+        }
+
+        self.notify.notify_one();
+
+        Poll::Pending
+    }
+}

netstack-smoltcp/src/udp.rs

@@ -0,0 +1,155 @@
+use std::{
+    net::SocketAddr,
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+use etherparse::PacketBuilder;
+use futures::{ready, Sink, SinkExt, Stream};
+use smoltcp::wire::UdpPacket;
+use tokio::sync::mpsc::{Receiver, Sender};
+use tokio_util::sync::PollSender;
+use tracing::{error, trace};
+
+use crate::packet::{AnyIpPktFrame, IpPacket};
+
+pub type UdpMsg = (
+    Vec<u8>,    /* payload */
+    SocketAddr, /* local */
+    SocketAddr, /* remote */
+);
+
+pub struct UdpSocket {
+    udp_rx: Receiver<AnyIpPktFrame>,
+    stack_tx: PollSender<AnyIpPktFrame>,
+}
+
+impl UdpSocket {
+    pub(super) fn new(udp_rx: Receiver<AnyIpPktFrame>, stack_tx: Sender<AnyIpPktFrame>) -> Self {
+        Self {
+            udp_rx,
+            stack_tx: PollSender::new(stack_tx),
+        }
+    }
+
+    pub fn split(self) -> (ReadHalf, WriteHalf) {
+        (
+            ReadHalf {
+                udp_rx: self.udp_rx,
+            },
+            WriteHalf {
+                stack_tx: self.stack_tx,
+            },
+        )
+    }
+}
+
+pub struct ReadHalf {
+    udp_rx: Receiver<AnyIpPktFrame>,
+}
+
+pub struct WriteHalf {
+    stack_tx: PollSender<AnyIpPktFrame>,
+}
+
+impl Stream for ReadHalf {
+    type Item = UdpMsg;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        loop {
+            match ready!(self.udp_rx.poll_recv(cx)) {
+                Some(frame) => {
+                    let packet = match IpPacket::new_checked(frame.as_slice()) {
+                        Ok(p) => p,
+                        Err(err) => {
+                            error!("invalid IP packet: {}", err);
+                            continue;
+                        }
+                    };
+
+                    let src_ip = packet.src_addr();
+                    let dst_ip = packet.dst_addr();
+                    let payload = packet.payload();
+
+                    let packet = match UdpPacket::new_checked(payload) {
+                        Ok(p) => p,
+                        Err(err) => {
+                            error!("invalid err: {err}, src_ip: {src_ip}, dst_ip: {dst_ip}, payload: {payload:?}");
+                            continue;
+                        }
+                    };
+                    let src_port = packet.src_port();
+                    let dst_port = packet.dst_port();
+
+                    let src_addr = SocketAddr::new(src_ip, src_port);
+                    let dst_addr = SocketAddr::new(dst_ip, dst_port);
+
+                    trace!("created UDP socket for {} <-> {}", src_addr, dst_addr);
+
+                    return Poll::Ready(Some((packet.payload().to_vec(), src_addr, dst_addr)));
+                }
+                None => return Poll::Ready(None),
+            }
+        }
+    }
+}
+
+impl Sink<UdpMsg> for WriteHalf {
+    type Error = std::io::Error;
+
+    fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        match ready!(self.stack_tx.poll_ready_unpin(cx)) {
+            Ok(()) => Poll::Ready(Ok(())),
+            Err(err) => Poll::Ready(Err(std::io::Error::other(err))),
+        }
+    }
+
+    fn start_send(mut self: Pin<&mut Self>, item: UdpMsg) -> Result<(), Self::Error> {
+        use std::io::{Error, ErrorKind::InvalidData};
+        let (data, src_addr, dst_addr) = item;
+
+        if data.is_empty() {
+            return Ok(());
+        }
+
+        let builder = match (src_addr, dst_addr) {
+            (SocketAddr::V4(src), SocketAddr::V4(dst)) => {
+                PacketBuilder::ipv4(src.ip().octets(), dst.ip().octets(), 20)
+                    .udp(src_addr.port(), dst_addr.port())
+            }
+            (SocketAddr::V6(src), SocketAddr::V6(dst)) => {
+                PacketBuilder::ipv6(src.ip().octets(), dst.ip().octets(), 20)
+                    .udp(src_addr.port(), dst_addr.port())
+            }
+            _ => {
+                return Err(Error::new(InvalidData, "src or destination type unmatch"));
+            }
+        };
+
+        let mut ip_packet_writer = Vec::with_capacity(builder.size(data.len()));
+        builder
+            .write(&mut ip_packet_writer, &data)
+            .map_err(|err| Error::other(format!("PacketBuilder::write: {err}")))?;
+
+        match self.stack_tx.start_send_unpin(ip_packet_writer) {
+            Ok(()) => Ok(()),
+            Err(err) => Err(Error::other(format!("send error: {err}"))),
+        }
+    }
+
+    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        use std::io::Error;
+        match ready!(self.stack_tx.poll_flush_unpin(cx)) {
+            Ok(()) => Poll::Ready(Ok(())),
+            Err(err) => Poll::Ready(Err(Error::other(format!("flush error: {err}")))),
+        }
+    }
+
+    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        use std::io::Error;
+        match ready!(self.stack_tx.poll_close_unpin(cx)) {
+            Ok(()) => Poll::Ready(Ok(())),
+            Err(err) => Poll::Ready(Err(Error::other(format!("close error: {err}")))),
+        }
+    }
+}

netstack-smoltcp/tests/regression.rs

@@ -0,0 +1,75 @@
+//! Regression tests that reproduce the bugs found in the static analysis.
+
+use std::time::Duration;
+
+use etherparse::{IpNumber, Ipv4Header, UdpHeader};
+use futures::SinkExt;
+use tokio::time::timeout;
+
+use netstack_smoltcp::StackBuilder;
+
+fn make_udp_ipv4(
+    src_ip: [u8; 4],
+    src_port: u16,
+    dst_ip: [u8; 4],
+    dst_port: u16,
+    payload: &[u8],
+) -> Vec<u8> {
+    let udp_hdr = UdpHeader::with_ipv4_checksum(
+        src_port,
+        dst_port,
+        &Ipv4Header::new(
+            (UdpHeader::LEN + payload.len()) as u16,
+            64,
+            IpNumber::UDP,
+            src_ip,
+            dst_ip,
+        )
+        .unwrap(),
+        payload,
+    )
+    .unwrap();
+
+    let ip_hdr = Ipv4Header::new(
+        (UdpHeader::LEN + payload.len()) as u16,
+        64,
+        IpNumber::UDP,
+        src_ip,
+        dst_ip,
+    )
+    .unwrap();
+
+    let mut buf = Vec::with_capacity(Ipv4Header::MIN_LEN + UdpHeader::LEN + payload.len());
+    ip_hdr.write(&mut buf).unwrap();
+    udp_hdr.write(&mut buf).unwrap();
+    buf.extend_from_slice(payload);
+    buf
+}
+
+/// before(include) a15e0b72bfc72cb032e67138070da01e325d66f8
+/// sink_buf is used in `Stack` to hold a slot for sending any pkt
+///
+/// the original assumption is that the `poll_ready` -> `start_send` -> `poll_flush`
+/// are called sequentially so the slot could be reused and will never get blocked.
+///
+/// but once the user calls `send_all` on `Stack`, which will not immediate flush the pkt(call `poll_flush`),
+/// then `sink_buf` is could be Some(pkt), then it will trigger `Poll::Pending` branch in `Stack::poll_ready`,
+/// who did not register the waker correctly, so it will got hanged forever.
+#[tokio::test(flavor = "current_thread")]
+async fn bug1_poll_ready_waker_registered_via_send_all() {
+    let (mut stack, _runner, _udp_socket, _tcp) = StackBuilder::default()
+        .enable_udp(true)
+        .udp_buffer_size(64)
+        .stack_buffer_size(64)
+        .build()
+        .unwrap();
+
+    let pkt1 = make_udp_ipv4([1, 2, 3, 4], 1111, [5, 6, 7, 8], 9999, b"first");
+    let pkt2 = make_udp_ipv4([1, 2, 3, 4], 1111, [5, 6, 7, 8], 9999, b"second");
+
+    let mut stream = futures::stream::iter([Ok(pkt1), Ok(pkt2)]);
+
+    let result = timeout(Duration::from_secs(1), stack.send_all(&mut stream)).await;
+    // should be ok after the fix
+    assert!(result.is_ok());
+}

ostp-client/Cargo.toml

@@ -9,8 +9,31 @@ anyhow.workspace = true
 bytes.workspace = true
 tokio.workspace = true
 tracing.workspace = true
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+tracing-appender = "0.2"
 ostp-core = { path = "../ostp-core" }
+ostp-tun = { path = "../ostp-tun" }
 rand.workspace = true
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+json_comments = "0.2"
 portable-atomic.workspace = true
+chrono = "0.4"
+socket2 = "0.6.3"
+futures-util = "0.3.32"
+hmac = "0.12.1"
+sha2 = "0.10.8"
+base64 = "0.22.1"
+webpki-roots = "0.26"
+tun = { version = "0.8.9", features = ["async"] }
+netstack-smoltcp = "0.2.2"
+futures = "0.3.32"
+libc = "0.2.186"
+x25519-dalek = "2.0.1"
+chacha20poly1305.workspace = true
+hex = "0.4.3"
+winapi = { version = "0.3.9", features = ["iphlpapi", "tcpmib", "processthreadsapi", "psapi", "handleapi", "winerror", "minwindef", "winnt", "iptypes", "ws2def", "ws2tcpip", "winsock2"] }
+ipnet = "2.12.0"
+
+[target."cfg(unix)".dependencies]
+libc = "0.2.186"

ostp-client/src/app.rs

@@ -40,6 +40,9 @@ pub enum BridgeCommand {
     ToggleTunnel,
     NextProfile,
     ReloadConfig,
+    /// Triggered by Android NetworkCallback when the active network changes (WiFi→LTE, etc.).
+    /// Causes an immediate background reconnect without waiting for stall detection.
+    NetworkChanged,
     Shutdown,
 }
 
@@ -54,6 +57,12 @@ pub struct AppState {
     pub log_scroll: u16,
 }
 
+impl Default for AppState {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl AppState {
     pub fn new() -> Self {
         Self {

ostp-client/src/bin/test_route.rs

@@ -0,0 +1,21 @@
+fn main() {
+    let socket = std::net::UdpSocket::bind("0.0.0.0:0").unwrap();
+    let port = socket.local_addr().unwrap().port();
+    println!("Bound UDP to port {}", port);
+    
+    if let Some(name) = ostp_client::tunnel::process_lookup::get_process_name_from_port_udp(port) {
+        println!("Found process for UDP port {}: {}", port, name);
+    } else {
+        println!("Process not found for UDP port {}", port);
+    }
+
+    let tcp_socket = std::net::TcpListener::bind("0.0.0.0:0").unwrap();
+    let tcp_port = tcp_socket.local_addr().unwrap().port();
+    println!("Bound TCP to port {}", tcp_port);
+
+    if let Some(name) = ostp_client::tunnel::process_lookup::get_process_name_from_port(tcp_port) {
+        println!("Found process for TCP port {}: {}", tcp_port, name);
+    } else {
+        println!("Process not found for TCP port {}", tcp_port);
+    }
+}

ostp-client/src/bridge.rs

@@ -1,978 +1,26 @@
-use std::time::{Duration, SystemTime};
-use std::sync::atomic::Ordering;
-use portable_atomic::AtomicU64;
-use std::sync::Arc;
-
-use anyhow::{Context, Result};
-use bytes::Bytes;
-use ostp_core::relay::RelayMessage;
-use ostp_core::{NoiseRole, OstpEvent, PaddingStrategy, ProtocolAction, ProtocolConfig, ProtocolMachine, TrafficProfile};
-use rand::Rng;
-use tokio::net::UdpSocket;
-use tokio::sync::{mpsc, watch};
-use tokio::time::{interval, timeout, Instant};
-
-use crate::app::{BridgeCommand, ConnectionStatus, UiEvent};
-use crate::config::ClientConfig;
-use crate::tunnel::{ProxyEvent, ProxyToClientMsg};
+use portable_atomic::{AtomicU64, AtomicU32, AtomicU8};
 
 pub struct BridgeMetrics {
     pub bytes_sent: AtomicU64,
     pub bytes_recv: AtomicU64,
+    pub connection_state: AtomicU8,
+    pub rtt_ms: AtomicU32,
 }
 
-struct SessionState {
-    socket: Arc<UdpSocket>,
-    machine: ProtocolMachine,
-}
-
-pub struct Bridge {
-    running: bool,
-    profile: TrafficProfile,
-    server_addr: String,
-    local_bind_addr: String,
-    proxy_addr: String,
-    access_key: Bytes,
-    handshake_timeout_ms: u64,
-    io_timeout_ms: u64,
-
-    pub turn_enabled: bool,
-    pub turn_server: String,
-    pub turn_username: String,
-    pub turn_password: String,
-    pub mode: String,
-    pub mux_enabled: bool,
-    pub mux_sessions: usize,
-
-    metrics: Arc<BridgeMetrics>,
-    sample_sent: u64,
-    sample_recv: u64,
-    last_rtt_ms: f64,
-    last_sample_at: Instant,
-    last_valid_recv: Instant,
-}
-
-impl Bridge {
-    pub fn new(config: &ClientConfig, metrics: Arc<BridgeMetrics>) -> Result<Self> {
-        Ok(Self {
-            running: false,
-            profile: TrafficProfile::JsonRpc,
-            server_addr: config.ostp.server_addr.clone(),
-            local_bind_addr: config.ostp.local_bind_addr.clone(),
-            proxy_addr: config.local_proxy.bind_addr.clone(),
-            access_key: Bytes::from(config.ostp.access_key.clone()),
-            handshake_timeout_ms: config.ostp.handshake_timeout_ms,
-            io_timeout_ms: config.ostp.io_timeout_ms,
-
-            turn_enabled: config.turn.enabled,
-            turn_server: config.turn.server_addr.clone(),
-            turn_username: config.turn.username.clone(),
-            turn_password: config.turn.access_key.clone(),
-            mode: config.mode.clone(),
-            mux_enabled: config.multiplex.enabled,
-            mux_sessions: config.multiplex.sessions.max(1),
-
-            metrics,
-            sample_sent: 0,
-            sample_recv: 0,
-            last_rtt_ms: 0.0,
-            last_sample_at: Instant::now(),
-            last_valid_recv: Instant::now(),
-        })
-    }
-
-    pub async fn run(
-        mut self,
-        tx: mpsc::Sender<UiEvent>,
-        mut bridge_rx: mpsc::Receiver<BridgeCommand>,
-        mut shutdown: watch::Receiver<bool>,
-        mut proxy_rx: mpsc::Receiver<ProxyEvent>,
-        proxy_tx: mpsc::Sender<(u16, ProxyToClientMsg)>,
-    ) -> Result<()> {
-        let mut metrics_tick = interval(Duration::from_millis(500));
-        let mut keepalive_tick = tokio::time::interval(Duration::from_secs(10));
-        let mut retransmit_tick = tokio::time::interval(Duration::from_millis(50));
-        let init_msg = if self.mode == "tun" {
-            "Bridge & TUN Tunnel Manager initialized".to_string()
-        } else {
-            "Bridge & SOCKS5 Proxy initialized".to_string()
-        };
-        tx.send(UiEvent::Log(init_msg)).await.ok();
-
-        let mut sessions_opt: Option<Vec<SessionState>> = None;
-        let mut udp_rx_opt: Option<mpsc::Receiver<(usize, Bytes)>> = None;
-        let mut _proxy_guard: Option<crate::sysproxy::WindowsProxyGuard> = None;
-
-        loop {
-            tokio::select! {
-                _ = shutdown.changed() => {
-                    if *shutdown.borrow() {
-                        self.running = false;
-                        _proxy_guard = None;
-                        break;
-                    }
-                }
-                cmd = bridge_rx.recv() => {
-                    match cmd {
-                        Some(BridgeCommand::ToggleTunnel) => {
-                            if self.running {
-                                self.running = false;
-                                _proxy_guard = None;
-                                sessions_opt = None;
-                                udp_rx_opt = None;
-                                tx.send(UiEvent::TunnelStopped).await.ok();
-                                let stop_msg = if self.mode == "tun" { "TUN Tunnel stopped" } else { "Bridge stopped" };
-                                tx.send(UiEvent::Log(stop_msg.to_string())).await.ok();
-                            } else {
-                                tx.send(UiEvent::Log("Handshaking started".to_string())).await.ok();
-                                tx.send(UiEvent::Metrics { status: ConnectionStatus::Handshaking, rtt_ms: 0.0, throughput_bps: 0 }).await.ok();
-                                
-                                let session_count = if self.mux_enabled { self.mux_sessions.max(1) } else { 1 };
-                                let (udp_tx, udp_rx) = mpsc::channel(10000);
-                                let mut sessions = Vec::with_capacity(session_count);
-                                let mut rtt_sum = 0.0;
-
-                                let mut handshake_error = None;
-                                for idx in 0..session_count {
-                                    let session_id: u32 = rand::thread_rng().gen();
-                                    match self.perform_handshake_with_id(&tx, session_id).await {
-                                        Ok((sock, mach, rtt)) => {
-                                            let socket = Arc::new(sock);
-                                            let socket_clone = socket.clone();
-                                            let udp_tx_clone = udp_tx.clone();
-                                            tokio::spawn(async move {
-                                                let mut buf = vec![0_u8; 65535];
-                                                loop {
-                                                    match socket_clone.recv(&mut buf).await {
-                                                        Ok(n) => {
-                                                            let inbound = Bytes::copy_from_slice(&buf[..n]);
-                                                            if udp_tx_clone.send((idx, inbound)).await.is_err() {
-                                                                break;
-                                                            }
-                                                        }
-                                                        Err(_) => break,
-                                                    }
-                                                }
-                                            });
-
-                                            sessions.push(SessionState { socket, machine: mach });
-                                            rtt_sum += rtt;
-                                        }
-                                        Err(err) => {
-                                            handshake_error = Some(err);
-                                            break;
-                                        }
-                                    }
-                                }
-
-                                if let Some(err) = handshake_error {
-                                    _proxy_guard = None;
-                                    tx.send(UiEvent::Log(format!("Handshake failed: {err}"))).await.ok();
-                                    tx.send(UiEvent::TunnelStopped).await.ok();
-                                    continue;
-                                }
-
-                                udp_rx_opt = Some(udp_rx);
-                                sessions_opt = Some(sessions);
-                                self.last_rtt_ms = rtt_sum / session_count as f64;
-                                self.running = true;
-                                self.last_sample_at = Instant::now();
-                                self.last_valid_recv = Instant::now();
-                                
-                                _proxy_guard = Some(crate::sysproxy::WindowsProxyGuard::enable(&self.proxy_addr));
-
-                                tx.send(UiEvent::Metrics {
-                                    status: ConnectionStatus::Established,
-                                    rtt_ms: self.last_rtt_ms,
-                                    throughput_bps: 0,
-                                }).await.ok();
-                                let start_msg = if self.mode == "tun" { "TUN Tunnel established" } else { "Bridge connection established" };
-                                tx.send(UiEvent::Log(start_msg.to_string())).await.ok();
-                            }
-                        }
-                        Some(BridgeCommand::NextProfile) => {
-                            self.profile = next_profile(self.profile);
-                            tx.send(UiEvent::ProfileChanged(self.profile)).await.ok();
-                            tx.send(UiEvent::Log(format!("Obfuscation profile switched to {:?}", self.profile))).await.ok();
-                        }
-                        Some(BridgeCommand::ReloadConfig) => {
-                            match ClientConfig::reload_from_json_near_binary() {
-                                Ok(cfg) => {
-                                    self.apply_runtime_config(&cfg);
-                                    tx.send(UiEvent::Log("Runtime config reloaded".to_string())).await.ok();
-                                    if self.running {
-                                        self.running = false;
-                                        _proxy_guard = None;
-                                        sessions_opt = None;
-                                        // User logic handles UI restart
-                                        let _ = tx.send(UiEvent::TunnelStopped).await;
-                                    }
-                                }
-                                Err(err) => {
-                                    let _ = tx.send(UiEvent::Log(format!("Config reload failed: {err}"))).await;
-                                }
-                            }
-                        }
-                        Some(BridgeCommand::Shutdown) | None => {
-                            self.running = false;
-                            _proxy_guard = None;
-                            break;
-                        }
-                    }
-                }
-                _ = metrics_tick.tick() => {
-                    if self.running {
-                        self.emit_metrics(&tx).await;
-                    }
-                }
-                _ = keepalive_tick.tick() => {
-                    if self.running {
-                        if self.last_valid_recv.elapsed().as_secs() > 15 {
-                            let _ = tx.send(UiEvent::Log("Connection timeout (no UDP packets received). Dropping connection.".into())).await;
-                            self.running = false;
-                            _proxy_guard = None;
-                            sessions_opt = None;
-                            let _ = tx.send(UiEvent::TunnelStopped).await;
-                            continue;
-                        }
-                        if let Some(sessions) = sessions_opt.as_mut() {
-                            for session in sessions.iter_mut() {
-                                let ts = SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_millis() as u64;
-                                let payload = Bytes::from(RelayMessage::Ping(ts).encode());
-                                if let Ok(ProtocolAction::SendDatagram(frame)) = session.machine.on_event(OstpEvent::Outbound(0, payload)) {
-                                    let _ = session.socket.send(&frame).await;
-                                    self.metrics.bytes_sent.fetch_add(frame.len() as u64, Ordering::Relaxed);
-                                }
-                            }
-                        }
-                    }
-                }
-                _ = retransmit_tick.tick() => {
-                    if self.running {
-                        if let Some(sessions) = sessions_opt.as_mut() {
-                            for session in sessions.iter_mut() {
-                                let action = match session.machine.on_event(OstpEvent::Tick) {
-                                    Ok(a) => a,
-                                    Err(e) => {
-                                        let _ = tx.send(UiEvent::Log(format!("Protocol tick error: {e}"))).await;
-                                        continue;
-                                    }
-                                };
-
-                                let mut queue = vec![action];
-                                while let Some(current_action) = queue.pop() {
-                                    match current_action {
-                                        ProtocolAction::Multiple(nested) => {
-                                            for a in nested {
-                                                queue.push(a);
-                                            }
-                                        }
-                                        ProtocolAction::SendDatagram(frame) => {
-                                            let _ = session.socket.send(&frame).await;
-                                            self.metrics.bytes_sent.fetch_add(frame.len() as u64, Ordering::Relaxed);
-                                        }
-                                        _ => {}
-                                    }
-                                }
-                            }
-                        }
-                    }
-                }
-                proxy_ev = proxy_rx.recv(), if self.running => {
-                    if let Some(ev) = proxy_ev {
-                        if let Some(sessions) = sessions_opt.as_mut() {
-                            if sessions.is_empty() {
-                                if let ProxyEvent::NewStream { stream_id, .. } = ev {
-                                    let _ = proxy_tx.send((stream_id, ProxyToClientMsg::Error("tunnel stopped".into()))).await;
-                                }
-                                continue;
-                            }
-                            let (stream_id, relay_msg) = match ev {
-                                ProxyEvent::NewStream { stream_id, target } => {
-                                    let _ = tx.send(UiEvent::Log(format!("Proxy CONNECT stream_id={stream_id} target={target}"))).await;
-                                    (stream_id, RelayMessage::Connect(target))
-                                }
-                                ProxyEvent::Data { stream_id, payload } => (stream_id, RelayMessage::Data(payload.to_vec())),
-                                ProxyEvent::Close { stream_id } => {
-                                    let _ = tx.send(UiEvent::Log(format!("Proxy CLOSE stream_id={stream_id}"))).await;
-                                    (stream_id, RelayMessage::Close)
-                                }
-                            };
-                            let session_index = (stream_id as usize) % sessions.len();
-                            let session = &mut sessions[session_index];
-                            let out_payload = Bytes::from(relay_msg.encode());
-                            match session.machine.on_event(OstpEvent::Outbound(stream_id, out_payload)) {
-                                Ok(ProtocolAction::SendDatagram(frame)) => {
-                                    if session.socket.send(&frame).await.is_ok() {
-                                        self.metrics.bytes_sent.fetch_add(frame.len() as u64, Ordering::Relaxed);
-                                        let _ = tx.send(UiEvent::Log(format!(
-                                            "Outbound datagram sent stream_id={stream_id} bytes={}",
-                                            frame.len()
-                                        ))).await;
-                                    }
-                                }
-                                Ok(ProtocolAction::Multiple(list)) => {
-                                    let mut sent = 0usize;
-                                    for item in list {
-                                        if let ProtocolAction::SendDatagram(frame) = item {
-                                            if session.socket.send(&frame).await.is_ok() {
-                                                self.metrics.bytes_sent.fetch_add(frame.len() as u64, Ordering::Relaxed);
-                                                sent += 1;
-                                            }
-                                        }
-                                    }
-                                    let _ = tx.send(UiEvent::Log(format!(
-                                        "Outbound datagram batch stream_id={stream_id} sent={sent}"
-                                    ))).await;
-                                }
-                                Ok(ProtocolAction::Noop) => {
-                                    let _ = tx.send(UiEvent::Log(format!(
-                                        "Outbound datagram noop stream_id={stream_id}"
-                                    ))).await;
-                                }
-                                Ok(_) => {
-                                    let _ = tx.send(UiEvent::Log(format!(
-                                        "Outbound datagram unexpected action stream_id={stream_id}"
-                                    ))).await;
-                                }
-                                Err(e) => {
-                                    let _ = tx.send(UiEvent::Log(format!("Protocol error packing TCP: {e}"))).await;
-                                }
-                            }
-                        } else {
-                            // Drop it, not connected
-                            if let ProxyEvent::NewStream { stream_id, .. } = ev {
-                                let _ = proxy_tx.send((stream_id, ProxyToClientMsg::Error("tunnel stopped".into()))).await;
-                            }
-                        }
-                    }
-                }
-                udp_msg = async {
-                    match udp_rx_opt.as_mut() {
-                        Some(rx) => rx.recv().await,
-                        None => std::future::pending().await,
-                    }
-                }, if self.running => {
-                    match udp_msg {
-                        Some((session_index, inbound)) => {
-                            self.metrics.bytes_recv.fetch_add(inbound.len() as u64, Ordering::Relaxed);
-                            self.last_valid_recv = Instant::now();
-                            if let Some(sessions) = sessions_opt.as_mut() {
-                                if session_index >= sessions.len() {
-                                    continue;
-                                }
-                                let session = &mut sessions[session_index];
-                                let initial_action = match session.machine.on_event(OstpEvent::Inbound(inbound)) {
-                                    Ok(a) => a,
-                                    Err(e) => {
-                                        let _ = tx.send(UiEvent::Log(format!("Protocol decrypt error: {e}"))).await;
-                                        continue;
-                                    }
-                                };
-
-                                let mut actions_queue = std::collections::VecDeque::new();
-                                actions_queue.push_back(initial_action);
-
-                                while let Some(current_action) = actions_queue.pop_front() {
-                                    match current_action {
-                                        ProtocolAction::Multiple(nested) => {
-                                            for a in nested {
-                                                actions_queue.push_back(a);
-                                            }
-                                        }
-                                        ProtocolAction::DeliverApp(stream_id, dec_payload) => {
-                                            match RelayMessage::decode(&dec_payload) {
-                                                Ok(relay_msg) => {
-                                                    match relay_msg {
-                                                        RelayMessage::ConnectOk => {
-                                                            let _ = tx.send(UiEvent::Log(format!("Relay CONNECT OK stream_id={stream_id}"))).await;
-                                                            let _ = proxy_tx.send((stream_id, ProxyToClientMsg::ConnectOk)).await;
-                                                        }
-                                                        RelayMessage::Data(data) => {
-                                                            let _ = proxy_tx.send((stream_id, ProxyToClientMsg::Data(Bytes::from(data)))).await;
-                                                        }
-                                                        RelayMessage::Close => {
-                                                            let _ = proxy_tx.send((stream_id, ProxyToClientMsg::Close)).await;
-                                                        }
-                                                        RelayMessage::Error(msg) => {
-                                                            let _ = tx.send(UiEvent::Log(format!("Relay error for stream {stream_id}: {msg}"))).await;
-                                                            let _ = proxy_tx.send((stream_id, ProxyToClientMsg::Error(msg))).await;
-                                                        }
-                                                        RelayMessage::Pong(ts) => {
-                                                            let now = SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_millis() as u64;
-                                                            self.last_rtt_ms = now.saturating_sub(ts) as f64;
-                                                        }
-                                                        RelayMessage::KeepAlive | RelayMessage::Ping(_) | RelayMessage::Connect(_) => {}
-                                                    }
-                                                }
-                                                Err(err) => {
-                                                    let _ = tx.send(UiEvent::Log(format!("Relay decode error for stream {stream_id}: {err}"))).await;
-                                                    let _ = proxy_tx.send((stream_id, ProxyToClientMsg::Error("relay decode failed".to_string()))).await;
-                                                }
-                                            }
-                                        }
-                                        ProtocolAction::SendDatagram(frame) => {
-                                            let _ = session.socket.send(&frame).await;
-                                            self.metrics.bytes_sent.fetch_add(frame.len() as u64, Ordering::Relaxed);
-                                        }
-                                        _ => {}
-                                    }
-                                }
-                            }
-                        }
-                        None => {
-                            let _ = tx.send(UiEvent::Log("UDP reader channel closed".to_string())).await;
-                            self.running = false;
-                            crate::sysproxy::disable_windows_proxy();
-                            sessions_opt = None;
-                            udp_rx_opt = None;
-                            let _ = tx.send(UiEvent::TunnelStopped).await;
-                        }
-                    }
-                }
-            }
+impl Default for BridgeMetrics {
+    fn default() -> Self {
+        Self {
+            bytes_sent: portable_atomic::AtomicU64::new(0),
+            bytes_recv: portable_atomic::AtomicU64::new(0),
+            connection_state: portable_atomic::AtomicU8::new(0),
+            rtt_ms: portable_atomic::AtomicU32::new(0),
         }
-
-        tx.send(UiEvent::Log("Bridge stopped".to_string())).await.ok();
-        Ok(())
-    }
-
-    async fn emit_metrics(&mut self, tx: &mpsc::Sender<UiEvent>) {
-        let now = Instant::now();
-        let elapsed = now.duration_since(self.last_sample_at).as_secs_f64().max(0.001);
-        self.last_sample_at = now;
-
-        let cur_sent = self.metrics.bytes_sent.load(Ordering::Relaxed);
-        let cur_recv = self.metrics.bytes_recv.load(Ordering::Relaxed);
-
-        let sent_delta = cur_sent.saturating_sub(self.sample_sent);
-        let recv_delta = cur_recv.saturating_sub(self.sample_recv);
-        
-        self.sample_sent = cur_sent;
-        self.sample_recv = cur_recv;
-
-        let outgoing = (sent_delta as f64 / elapsed) as u64;
-        let incoming = (recv_delta as f64 / elapsed) as u64;
-        let throughput = incoming.saturating_add(outgoing);
-
-        tx.send(UiEvent::Traffic { incoming_bps: incoming, outgoing_bps: outgoing }).await.ok();
-        tx.send(UiEvent::Metrics {
-            status: ConnectionStatus::Established,
-            rtt_ms: self.last_rtt_ms,
-            throughput_bps: throughput,
-        }).await.ok();
-    }
-
-    async fn perform_handshake_with_id(
-        &mut self,
-        tx: &mpsc::Sender<UiEvent>,
-        session_id: u32,
-    ) -> Result<(UdpSocket, ProtocolMachine, f64)> {
-        let timestamp = std::time::SystemTime::now()
-            .duration_since(std::time::UNIX_EPOCH)
-            .unwrap_or_default()
-            .as_secs();
-
-        let mut handshake_payload = Vec::with_capacity(8 + 4 + self.access_key.len());
-        handshake_payload.extend_from_slice(&timestamp.to_be_bytes());
-        handshake_payload.extend_from_slice(&session_id.to_be_bytes());
-        handshake_payload.extend_from_slice(&self.access_key);
-
-        let obf_key = ostp_core::crypto::derive_obfuscation_key(&self.access_key);
-        let psk = ostp_core::crypto::derive_psk(&self.access_key);
-
-        let mut machine = ProtocolMachine::new(ProtocolConfig {
-            role: NoiseRole::Initiator,
-            psk,
-            session_id,
-            handshake_payload,
-            max_padding: 256,
-            padding_strategy: PaddingStrategy::Profile(self.profile),
-            obfuscation_key: obf_key,
-            max_reorder: 262144,
-            max_reorder_buffer: 8192,
-            ack_delay_ms: 20,
-            rto_ms: 200,
-            max_retries: 8,
-            max_sent_history: 16384,
-        })?;
-
-        let socket = UdpSocket::bind(&self.local_bind_addr)
-            .await
-            .with_context(|| format!("failed to bind local udp {}", self.local_bind_addr))?;
-
-        if self.turn_enabled {
-            let turn_addr = if self.turn_server.contains(':') {
-                self.turn_server.clone()
-            } else {
-                format!("{}:3478", self.turn_server)
-            };
-            tx.send(UiEvent::Log(format!("TURN: Allocating relay via {}", turn_addr))).await.ok();
-
-            match perform_turn_allocation(&socket, &turn_addr, &self.turn_username, &self.turn_password, &self.server_addr).await {
-                Ok(relay_addr) => {
-                    tx.send(UiEvent::Log(format!("TURN: Relay allocated. Traffic tunnelled via {}", relay_addr))).await.ok();
-                    // Re-connect the UDP socket to the TURN server so all sends go through it.
-                    // The TURN server forwards ChannelData to the OSTP server transparently.
-                    socket
-                        .connect(&turn_addr)
-                        .await
-                        .with_context(|| format!("failed to re-connect to TURN {}", turn_addr))?;
-                }
-                Err(e) => {
-                    tx.send(UiEvent::Log(format!("TURN allocation failed: {e}. Falling back to direct UDP."))).await.ok();
-                    socket
-                        .connect(&self.server_addr)
-                        .await
-                        .with_context(|| format!("failed to connect udp to {}", self.server_addr))?;
-                }
-            }
-        } else {
-            tx.send(UiEvent::Log(format!("Connected UDP directly to {}", self.server_addr))).await.ok();
-            socket
-                .connect(&self.server_addr)
-                .await
-                .with_context(|| format!("failed to connect udp to {}", self.server_addr))?;
-        }
-
-        // Connection to remote is handled inside the TURN/direct branches above
-
-        let start = Instant::now();
-        let action = machine.on_event(OstpEvent::Start)?;
-        let handshake_frame = match action {
-            ProtocolAction::SendDatagram(frame) => frame,
-            _ => anyhow::bail!("protocol did not emit handshake datagram"),
-        };
-        socket.send(&handshake_frame).await?;
-        self.metrics.bytes_sent.fetch_add(handshake_frame.len() as u64, Ordering::Relaxed);
-
-        let mut buf = vec![0_u8; 4096];
-        let size = timeout(
-            Duration::from_millis(self.handshake_timeout_ms.max(1)),
-            socket.recv(&mut buf),
-        )
-        .await
-        .context("handshake timeout waiting server response")??;
-        self.metrics.bytes_recv.fetch_add(size as u64, Ordering::Relaxed);
-
-        let inbound = Bytes::copy_from_slice(&buf[..size]);
-        machine.on_event(OstpEvent::Inbound(inbound))?;
-        let rtt_ms = start.elapsed().as_secs_f64() * 1000.0;
-        
-        // Success
-        Ok((socket, machine, rtt_ms))
-    }
-
-    fn apply_runtime_config(&mut self, cfg: &ClientConfig) {
-        self.server_addr = cfg.ostp.server_addr.clone();
-        self.local_bind_addr = cfg.ostp.local_bind_addr.clone();
-        self.proxy_addr = cfg.local_proxy.bind_addr.clone();
-        self.access_key = Bytes::from(cfg.ostp.access_key.clone());
-        self.handshake_timeout_ms = cfg.ostp.handshake_timeout_ms;
-        self.io_timeout_ms = cfg.ostp.io_timeout_ms;
-        self.mode = cfg.mode.clone(); // Bug fix: mode was never updated on hot-reload
-        self.turn_enabled = cfg.turn.enabled;
-        self.turn_server = cfg.turn.server_addr.clone();
-        self.turn_username = cfg.turn.username.clone();
-        self.turn_password = cfg.turn.access_key.clone();
-        self.mux_enabled = cfg.multiplex.enabled;
-        self.mux_sessions = cfg.multiplex.sessions.max(1);
     }
 }
 
-fn next_profile(current: TrafficProfile) -> TrafficProfile {
-    match current {
-        TrafficProfile::JsonRpc => TrafficProfile::HttpsBurst,
-        TrafficProfile::HttpsBurst => TrafficProfile::VideoStream,
-        TrafficProfile::VideoStream => TrafficProfile::JsonRpc,
-    }
+pub fn set_socket_protector<F>(_f: F)
+where
+    F: Fn(i32) -> bool + Send + Sync + 'static,
+{
+    // stub
 }
-
-/// Real RFC-5766 TURN allocation with HMAC-SHA1 long-term credentials.
-///
-/// Flow:
-///   1. Send Allocate (unauthenticated) → get 401 with realm + nonce
-///   2. Compute HMAC-SHA1 key = MD5(username:realm:password)
-///   3. Re-send Allocate with MESSAGE-INTEGRITY
-///   4. Extract XOR-RELAYED-ADDRESS from success response
-///   5. Send ChannelBind to bind channel 0x4000 to the OSTP server addr
-///
-/// Returns the relay address string like "1.2.3.4:12345".
-async fn perform_turn_allocation(
-    socket: &UdpSocket,
-    turn_addr: &str,
-    username: &str,
-    password: &str,
-    ostp_server_addr: &str,
-) -> anyhow::Result<String> {
-    use std::net::ToSocketAddrs;
-
-    let turn_sock: std::net::SocketAddr = turn_addr
-        .to_socket_addrs()
-        .map_err(|e| anyhow::anyhow!("TURN DNS resolution failed: {e}"))?
-        .next()
-        .ok_or_else(|| anyhow::anyhow!("TURN addr resolved to nothing"))?;
-
-    let transaction_id = {
-        use rand::Rng;
-        let mut id = [0u8; 12];
-        rand::thread_rng().fill(&mut id);
-        id
-    };
-
-    // Helper: build a minimal STUN/TURN message
-    fn build_stun_msg(msg_type: u16, tx_id: &[u8; 12], attrs: &[u8]) -> Vec<u8> {
-        let mut msg = Vec::with_capacity(20 + attrs.len());
-        msg.extend_from_slice(&msg_type.to_be_bytes());
-        msg.extend_from_slice(&(attrs.len() as u16).to_be_bytes());
-        msg.extend_from_slice(&0x2112A442_u32.to_be_bytes()); // Magic Cookie
-        msg.extend_from_slice(tx_id);
-        msg.extend_from_slice(attrs);
-        msg
-    }
-
-    // Helper: encode a STUN attribute (type, length-padded value)
-    fn stun_attr(attr_type: u16, value: &[u8]) -> Vec<u8> {
-        let mut out = Vec::new();
-        out.extend_from_slice(&attr_type.to_be_bytes());
-        out.extend_from_slice(&(value.len() as u16).to_be_bytes());
-        out.extend_from_slice(value);
-        // Pad to 4-byte boundary
-        let pad = (4 - (value.len() % 4)) % 4;
-        out.extend(std::iter::repeat(0u8).take(pad));
-        out
-    }
-
-    // ── Step 1: unauthenticated Allocate ─────────────────────────────
-    // REQUESTED-TRANSPORT attr: 0x0019, value = 17 (UDP) + 3 reserved bytes
-    let req_transport = stun_attr(0x0019, &[17u8, 0, 0, 0]);
-    let alloc_req = build_stun_msg(0x0003, &transaction_id, &req_transport);
-
-    socket.send_to(&alloc_req, turn_sock).await
-        .map_err(|e| anyhow::anyhow!("TURN send Allocate failed: {e}"))?;
-
-    let mut buf = [0u8; 2048];
-    let (n, _) = timeout(Duration::from_millis(3000), socket.recv_from(&mut buf))
-        .await
-        .map_err(|_| anyhow::anyhow!("TURN Allocate response timed out"))?
-        .map_err(|e| anyhow::anyhow!("TURN recv failed: {e}"))?;
-
-    let resp = &buf[..n];
-    if resp.len() < 20 {
-        anyhow::bail!("TURN response too short");
-    }
-
-    let msg_type = u16::from_be_bytes([resp[0], resp[1]]);
-
-    // 0x0113 = Allocate Error Response
-    if msg_type != 0x0113 {
-        anyhow::bail!("Expected TURN 401 error response, got type 0x{:04x}", msg_type);
-    }
-
-    // Parse realm and nonce from the error response attributes
-    let mut realm: Option<String> = None;
-    let mut nonce: Option<String> = None;
-    {
-        let mut idx = 20usize;
-        while idx + 4 <= n {
-            let atype = u16::from_be_bytes([resp[idx], resp[idx + 1]]);
-            let alen = u16::from_be_bytes([resp[idx + 2], resp[idx + 3]]) as usize;
-            idx += 4;
-            if idx + alen > n { break; }
-            let val = &resp[idx..idx + alen];
-            match atype {
-                0x0014 => realm = Some(String::from_utf8_lossy(val).to_string()), // REALM
-                0x0015 => nonce = Some(String::from_utf8_lossy(val).to_string()), // NONCE
-                _ => {}
-            }
-            idx += alen;
-            let pad = (4 - (alen % 4)) % 4;
-            idx += pad;
-        }
-    }
-
-    let realm = realm.ok_or_else(|| anyhow::anyhow!("TURN 401: no REALM in response"))?;
-    let nonce = nonce.ok_or_else(|| anyhow::anyhow!("TURN 401: no NONCE in response"))?;
-
-    // ── Step 2: Compute long-term credential key per RFC 5389 §15.4 ──
-    // key = MD5(username ":" realm ":" password)
-    let key_input = format!("{}:{}:{}", username, realm, password);
-    let key = md5_hash(key_input.as_bytes());
-
-    // HMAC-SHA1 of the message (MESSAGE-INTEGRITY attribute, RFC 5389 §15.4)
-    // We build the message without the integrity attr, compute HMAC, then append.
-    let mut attrs2 = Vec::new();
-    attrs2.extend_from_slice(&stun_attr(0x0006, username.as_bytes())); // USERNAME
-    attrs2.extend_from_slice(&stun_attr(0x0014, realm.as_bytes()));    // REALM
-    attrs2.extend_from_slice(&stun_attr(0x0015, nonce.as_bytes()));    // NONCE
-    attrs2.extend_from_slice(&req_transport);                           // REQUESTED-TRANSPORT
-
-    // For MESSAGE-INTEGRITY we need the full message length including the MI attr (24 bytes)
-    let mi_placeholder_len = attrs2.len() + 4 + 20; // +4 header, +20 HMAC-SHA1
-    let mut msg_for_hmac = build_stun_msg(0x0003, &transaction_id, &attrs2);
-    // Set length field to include the upcoming MI attr
-    let new_len = (mi_placeholder_len - 20) as u16; // total attrs length including MI
-    msg_for_hmac[2..4].copy_from_slice(&new_len.to_be_bytes());
-    // Append MI header (without value)
-    msg_for_hmac.extend_from_slice(&0x0008_u16.to_be_bytes()); // attr type
-    msg_for_hmac.extend_from_slice(&20_u16.to_be_bytes());      // attr len
-
-    let hmac = hmac_sha1(&key, &msg_for_hmac);
-    let mut final_attrs = attrs2.clone();
-    final_attrs.extend_from_slice(&stun_attr(0x0008, &hmac)); // MESSAGE-INTEGRITY
-
-    let alloc_req2 = build_stun_msg(0x0003, &transaction_id, &final_attrs);
-
-    socket.send_to(&alloc_req2, turn_sock).await
-        .map_err(|e| anyhow::anyhow!("TURN authenticated Allocate send failed: {e}"))?;
-
-    let (n2, _) = timeout(Duration::from_millis(5000), socket.recv_from(&mut buf))
-        .await
-        .map_err(|_| anyhow::anyhow!("TURN authenticated Allocate timed out"))?
-        .map_err(|e| anyhow::anyhow!("TURN recv2 failed: {e}"))?;
-
-    let resp2 = &buf[..n2];
-    if resp2.len() < 20 {
-        anyhow::bail!("TURN auth response too short");
-    }
-    let msg_type2 = u16::from_be_bytes([resp2[0], resp2[1]]);
-    // 0x0103 = Allocate Success Response
-    if msg_type2 != 0x0103 {
-        anyhow::bail!("TURN Allocate auth failed, response type 0x{:04x}", msg_type2);
-    }
-
-    // ── Step 3: Parse XOR-RELAYED-ADDRESS ────────────────────────────
-    let relay_addr_str = {
-        let mut relayed: Option<String> = None;
-        let mut idx = 20usize;
-        while idx + 4 <= n2 {
-            let atype = u16::from_be_bytes([resp2[idx], resp2[idx + 1]]);
-            let alen = u16::from_be_bytes([resp2[idx + 2], resp2[idx + 3]]) as usize;
-            idx += 4;
-            if idx + alen > n2 { break; }
-            let val = &resp2[idx..idx + alen];
-            if atype == 0x0016 && alen >= 8 { // XOR-RELAYED-ADDRESS
-                let x_port = u16::from_be_bytes([val[2], val[3]]) ^ 0x2112;
-                let x_ip = [val[4], val[5], val[6], val[7]];
-                let ip = std::net::Ipv4Addr::new(
-                    x_ip[0] ^ 0x21, x_ip[1] ^ 0x12, x_ip[2] ^ 0xA4, x_ip[3] ^ 0x42,
-                );
-                relayed = Some(format!("{}:{}", ip, x_port));
-            }
-            idx += alen;
-            let pad = (4 - (alen % 4)) % 4;
-            idx += pad;
-        }
-        relayed.ok_or_else(|| anyhow::anyhow!("TURN: no XOR-RELAYED-ADDRESS in response"))?
-    };
-
-    // ── Step 4: ChannelBind to the OSTP server ────────────────────────
-    // ChannelBind binds channel 0x4000 to the peer (OSTP server).
-    // After this, all UDP data we send as ChannelData (4 bytes header + payload)
-    // will be forwarded by the TURN server to the OSTP server transparently.
-    let ostp_sock: std::net::SocketAddr = ostp_server_addr
-        .to_socket_addrs()
-        .map_err(|e| anyhow::anyhow!("OSTP server DNS resolution failed: {e}"))?
-        .next()
-        .ok_or_else(|| anyhow::anyhow!("OSTP server addr resolved to nothing"))?;
-
-    let channel_number: u16 = 0x4000;
-    let mut peer_addr_attr = Vec::new();
-    peer_addr_attr.push(0u8); // reserved
-    peer_addr_attr.push(0x01u8); // family IPv4
-    peer_addr_attr.extend_from_slice(&(ostp_sock.port() ^ 0x2112).to_be_bytes()); // XOR port
-    if let std::net::IpAddr::V4(ipv4) = ostp_sock.ip() {
-        let octets = ipv4.octets();
-        peer_addr_attr.push(octets[0] ^ 0x21);
-        peer_addr_attr.push(octets[1] ^ 0x12);
-        peer_addr_attr.push(octets[2] ^ 0xA4);
-        peer_addr_attr.push(octets[3] ^ 0x42);
-    } else {
-        anyhow::bail!("TURN ChannelBind: IPv6 OSTP server not yet supported");
-    }
-
-    let mut cb_attrs = Vec::new();
-    // CHANNEL-NUMBER attr: 0x000C
-    cb_attrs.extend_from_slice(&stun_attr(0x000C, &[
-        (channel_number >> 8) as u8, channel_number as u8, 0, 0
-    ]));
-    // XOR-PEER-ADDRESS attr: 0x0012
-    cb_attrs.extend_from_slice(&stun_attr(0x0012, &peer_addr_attr));
-    cb_attrs.extend_from_slice(&stun_attr(0x0006, username.as_bytes()));
-    cb_attrs.extend_from_slice(&stun_attr(0x0014, realm.as_bytes()));
-    cb_attrs.extend_from_slice(&stun_attr(0x0015, nonce.as_bytes()));
-
-    // Compute MESSAGE-INTEGRITY for ChannelBind too
-    let mi_len2 = cb_attrs.len() + 4 + 20;
-    let mut cb_for_hmac = build_stun_msg(0x0009, &transaction_id, &cb_attrs);
-    cb_for_hmac[2..4].copy_from_slice(&((mi_len2 - 20) as u16).to_be_bytes());
-    cb_for_hmac.extend_from_slice(&0x0008_u16.to_be_bytes());
-    cb_for_hmac.extend_from_slice(&20_u16.to_be_bytes());
-    let cb_hmac = hmac_sha1(&key, &cb_for_hmac);
-    cb_attrs.extend_from_slice(&stun_attr(0x0008, &cb_hmac));
-
-    let cb_req = build_stun_msg(0x0009, &transaction_id, &cb_attrs);
-    socket.send_to(&cb_req, turn_sock).await
-        .map_err(|e| anyhow::anyhow!("TURN ChannelBind send failed: {e}"))?;
-
-    let (n3, _) = timeout(Duration::from_millis(3000), socket.recv_from(&mut buf))
-        .await
-        .map_err(|_| anyhow::anyhow!("TURN ChannelBind response timed out"))?
-        .map_err(|e| anyhow::anyhow!("TURN ChannelBind recv failed: {e}"))?;
-
-    let resp3 = &buf[..n3];
-    if resp3.len() < 4 {
-        anyhow::bail!("TURN ChannelBind response too short");
-    }
-    let cb_resp_type = u16::from_be_bytes([resp3[0], resp3[1]]);
-    // 0x0109 = ChannelBind Success Response
-    if cb_resp_type != 0x0109 {
-        anyhow::bail!("TURN ChannelBind failed, response type 0x{:04x}", cb_resp_type);
-    }
-
-    Ok(relay_addr_str)
-}
-
-/// Pure-Rust MD5 hash (16 bytes). Used for TURN long-term credential key derivation.
-fn md5_hash(input: &[u8]) -> [u8; 16] {
-    // RFC 1321 MD5 constants
-    const S: [u32; 64] = [
-        7,12,17,22, 7,12,17,22, 7,12,17,22, 7,12,17,22,
-        5, 9,14,20, 5, 9,14,20, 5, 9,14,20, 5, 9,14,20,
-        4,11,16,23, 4,11,16,23, 4,11,16,23, 4,11,16,23,
-        6,10,15,21, 6,10,15,21, 6,10,15,21, 6,10,15,21,
-    ];
-    const K: [u32; 64] = [
-        0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
-        0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
-        0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
-        0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
-        0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
-        0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
-        0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
-        0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
-        0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
-        0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
-        0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
-    ];
-
-    let msg_len = input.len();
-    let bit_len = (msg_len as u64) * 8;
-
-    let mut padded = input.to_vec();
-    padded.push(0x80);
-    while padded.len() % 64 != 56 {
-        padded.push(0);
-    }
-    padded.extend_from_slice(&bit_len.to_le_bytes());
-
-    let mut a0: u32 = 0x67452301;
-    let mut b0: u32 = 0xefcdab89;
-    let mut c0: u32 = 0x98badcfe;
-    let mut d0: u32 = 0x10325476;
-
-    for chunk in padded.chunks(64) {
-        let mut m = [0u32; 16];
-        for (i, item) in m.iter_mut().enumerate() {
-            *item = u32::from_le_bytes([chunk[i*4], chunk[i*4+1], chunk[i*4+2], chunk[i*4+3]]);
-        }
-        let (mut a, mut b, mut c, mut d) = (a0, b0, c0, d0);
-        for i in 0..64usize {
-            let (f, g) = match i {
-                0..=15  => ((b & c) | (!b & d),              i),
-                16..=31 => ((d & b) | (!d & c),              (5*i + 1) % 16),
-                32..=47 => (b ^ c ^ d,                        (3*i + 5) % 16),
-                _       => (c ^ (b | !d),                     (7*i) % 16),
-            };
-            let temp = d;
-            d = c;
-            c = b;
-            b = b.wrapping_add((a.wrapping_add(f).wrapping_add(K[i]).wrapping_add(m[g])).rotate_left(S[i]));
-            a = temp;
-        }
-        a0 = a0.wrapping_add(a);
-        b0 = b0.wrapping_add(b);
-        c0 = c0.wrapping_add(c);
-        d0 = d0.wrapping_add(d);
-    }
-
-    let mut result = [0u8; 16];
-    result[0..4].copy_from_slice(&a0.to_le_bytes());
-    result[4..8].copy_from_slice(&b0.to_le_bytes());
-    result[8..12].copy_from_slice(&c0.to_le_bytes());
-    result[12..16].copy_from_slice(&d0.to_le_bytes());
-    result
-}
-
-/// HMAC-SHA1 for TURN MESSAGE-INTEGRITY (RFC 2104 + RFC 5389 §15.4).
-fn hmac_sha1(key: &[u8], message: &[u8]) -> [u8; 20] {
-    const BLOCK_SIZE: usize = 64;
-
-    let mut k = [0u8; BLOCK_SIZE];
-    if key.len() > BLOCK_SIZE {
-        let h = sha1_hash(key);
-        k[..20].copy_from_slice(&h);
-    } else {
-        k[..key.len()].copy_from_slice(key);
-    }
-
-    let mut ipad = [0u8; BLOCK_SIZE];
-    let mut opad = [0u8; BLOCK_SIZE];
-    for i in 0..BLOCK_SIZE {
-        ipad[i] = k[i] ^ 0x36;
-        opad[i] = k[i] ^ 0x5C;
-    }
-
-    let mut inner = ipad.to_vec();
-    inner.extend_from_slice(message);
-    let inner_hash = sha1_hash(&inner);
-
-    let mut outer = opad.to_vec();
-    outer.extend_from_slice(&inner_hash);
-    sha1_hash(&outer)
-}
-
-/// Pure-Rust SHA-1 (RFC 3174).
-fn sha1_hash(input: &[u8]) -> [u8; 20] {
-    let msg_len = input.len();
-    let bit_len = (msg_len as u64) * 8;
-    let mut padded = input.to_vec();
-    padded.push(0x80);
-    while padded.len() % 64 != 56 {
-        padded.push(0);
-    }
-    padded.extend_from_slice(&bit_len.to_be_bytes());
-
-    let mut h: [u32; 5] = [0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0];
-
-    for chunk in padded.chunks(64) {
-        let mut w = [0u32; 80];
-        for i in 0..16 {
-            w[i] = u32::from_be_bytes([chunk[i*4], chunk[i*4+1], chunk[i*4+2], chunk[i*4+3]]);
-        }
-        for i in 16..80 {
-            w[i] = (w[i-3] ^ w[i-8] ^ w[i-14] ^ w[i-16]).rotate_left(1);
-        }
-        let (mut a, mut b, mut c, mut d, mut e) = (h[0], h[1], h[2], h[3], h[4]);
-        for i in 0..80usize {
-            let (f, k) = match i {
-                0..=19  => ((b & c) | (!b & d), 0x5A827999u32),
-                20..=39 => (b ^ c ^ d,           0x6ED9EBA1),
-                40..=59 => ((b & c) | (b & d) | (c & d), 0x8F1BBCDC),
-                _       => (b ^ c ^ d,           0xCA62C1D6),
-            };
-            let temp = a.rotate_left(5).wrapping_add(f).wrapping_add(e).wrapping_add(k).wrapping_add(w[i]);
-            e = d; d = c; c = b.rotate_left(30); b = a; a = temp;
-        }
-        h[0] = h[0].wrapping_add(a); h[1] = h[1].wrapping_add(b);
-        h[2] = h[2].wrapping_add(c); h[3] = h[3].wrapping_add(d);
-        h[4] = h[4].wrapping_add(e);
-    }
-
-    let mut out = [0u8; 20];
-    for (i, &v) in h.iter().enumerate() {
-        out[i*4..(i+1)*4].copy_from_slice(&v.to_be_bytes());
-    }
-    out
-}
-

ostp-client/src/config.rs

@@ -1,109 +1,133 @@
 use anyhow::{Context, Result};
 use serde::{Deserialize, Serialize};
 
-/// Client runtime configuration.
-/// Constructed by the main binary from the unified `config.json`,
-/// then passed into `runner::run_client`. All I/O happens in the
-/// binary layer — this crate only owns the plain data structures.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ClientConfig {
-    pub mode: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub version: Option<String>,
     #[serde(default)]
-    pub debug: bool,
-    pub ostp: OstpConfig,
-    pub local_proxy: LocalProxyConfig,
-    pub turn: TurnConfig,
+    pub log: LogConfig,
     #[serde(default)]
-    pub exclusions: ExclusionConfig,
+    pub inbounds: Vec<InboundConfig>,
     #[serde(default)]
-    pub multiplex: MultiplexConfig,
+    pub outbounds: Vec<OutboundConfig>,
+    #[serde(default)]
+    pub routing: RoutingConfig,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub gui: Option<serde_json::Value>,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, Default)]
-pub struct ExclusionConfig {
-    #[serde(default)]
-    pub domains: Vec<String>,
-    #[serde(default)]
-    pub ips: Vec<String>,
-    #[serde(default)]
-    pub processes: Vec<String>,
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct LogConfig {
+    #[serde(default = "default_log_level")]
+    pub level: String,
+}
+
+impl Default for LogConfig {
+    fn default() -> Self {
+        Self { level: default_log_level() }
+    }
+}
+
+fn default_log_level() -> String { "info".to_string() }
+fn default_true() -> bool { true }
+pub fn default_mtu() -> usize { 1140 }
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum InboundConfig {
+    Tun {
+        tag: String,
+        #[serde(default = "default_true")]
+        auto_route: bool,
+        #[serde(default = "default_mtu")]
+        mtu: usize,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        fd: Option<i32>,
+    },
+    LocalProxy {
+        tag: String,
+        protocol: String, // "socks" or "http"
+        listen: String,
+        port: u16,
+        #[serde(default)]
+        set_system_proxy: bool,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum OutboundConfig {
+    Selector {
+        tag: String,
+        outbounds: Vec<String>,
+        default: Option<String>,
+    },
+    Urltest {
+        tag: String,
+        outbounds: Vec<String>,
+        url: Option<String>,
+        interval: Option<String>,
+    },
+    Ostp {
+        tag: String,
+        server: String,
+        port: u16,
+        access_key: String,
+        #[serde(default)]
+        transport: TransportConfig,
+        #[serde(default)]
+        multiplex: MultiplexConfig,
+    },
+    Direct {
+        tag: String,
+    },
+    Socks {
+        tag: String,
+        server: String,
+        port: u16,
+    },
+    Block {
+        tag: String,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TransportConfig {
+    #[serde(default = "default_transport_mode")]
+    pub r#type: String, // "udp", "uot", or "dns"
+    
+    // Settings for DNS transport
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub domain: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub resolver: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub pubkey: Option<String>,
+}
+
+fn default_transport_mode() -> String { "udp".to_string() }
+
+impl Default for TransportConfig {
+    fn default() -> Self {
+        Self {
+            r#type: default_transport_mode(),
+            domain: None,
+            resolver: None,
+            pubkey: None,
+        }
+    }
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct MultiplexConfig {
+    #[serde(default)]
     pub enabled: bool,
+    #[serde(default = "default_mux_sessions")]
     pub sessions: usize,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct OstpConfig {
-    pub server_addr: String,
-    pub local_bind_addr: String,
-    #[serde(alias = "auth_token")]
-    pub access_key: String,
-    pub handshake_timeout_ms: u64,
-    pub io_timeout_ms: u64,
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct LocalProxyConfig {
-    pub bind_addr: String,
-    pub connect_timeout_ms: u64,
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct TurnConfig {
-    pub enabled: bool,
-    pub server_addr: String,
-    pub username: String,
-    pub access_key: String,
-}
-
-impl Default for OstpConfig {
-    fn default() -> Self {
-        Self {
-            server_addr: "127.0.0.1:50000".to_string(),
-            local_bind_addr: "0.0.0.0:0".to_string(),
-            access_key: String::new(),
-            handshake_timeout_ms: 10000,
-            io_timeout_ms: 2500,
-        }
-    }
-}
-
-impl Default for LocalProxyConfig {
-    fn default() -> Self {
-        Self {
-            bind_addr: "127.0.0.1:1088".to_string(),
-            connect_timeout_ms: 15000,
-        }
-    }
-}
-
-impl Default for TurnConfig {
-    fn default() -> Self {
-        Self {
-            enabled: false,
-            server_addr: String::new(),
-            username: String::new(),
-            access_key: String::new(),
-        }
-    }
-}
-
-impl Default for ClientConfig {
-    fn default() -> Self {
-        Self {
-            mode: "proxy".to_string(),
-            debug: false,
-            ostp: OstpConfig::default(),
-            local_proxy: LocalProxyConfig::default(),
-            turn: TurnConfig::default(),
-            exclusions: ExclusionConfig::default(),
-            multiplex: MultiplexConfig::default(),
-        }
-    }
-}
+fn default_mux_sessions() -> usize { 1 }
 
 impl Default for MultiplexConfig {
     fn default() -> Self {
@@ -114,42 +138,30 @@ impl Default for MultiplexConfig {
     }
 }
 
-/// Unified shape of `config.json` as seen by the client.
-/// Used only for hot-reloading (`BridgeCommand::ReloadConfig`).
-#[derive(Debug, Deserialize)]
-struct RawUnifiedConfig {
-    #[allow(dead_code)]
-    mode: String,
-    debug: Option<bool>,
-    server: Option<String>,
-    access_key: Option<String>,
-    socks5_bind: Option<String>,
-    tun: Option<RawTunSection>,
-    exclude: Option<RawExcludeSection>,
-    mux: Option<RawMuxSection>,
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct RoutingConfig {
+    #[serde(default)]
+    pub rules: Vec<RoutingRule>,
+    #[serde(default)]
+    pub default_outbound: String,
 }
 
-#[derive(Debug, Deserialize)]
-struct RawTunSection {
-    enable: Option<bool>,
-}
-
-#[derive(Debug, Deserialize)]
-struct RawExcludeSection {
-    domains: Option<Vec<String>>,
-    ips: Option<Vec<String>>,
-    processes: Option<Vec<String>>,
-}
-
-#[derive(Debug, Deserialize)]
-struct RawMuxSection {
-    enabled: Option<bool>,
-    sessions: Option<usize>,
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RoutingRule {
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub domain_suffix: Option<Vec<String>>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub ip_cidr: Option<Vec<String>>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub process_name: Option<Vec<String>>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub inbound_tag: Option<Vec<String>>,
+    pub outbound: String,
 }
 
 impl ClientConfig {
     /// Hot-reload from `config.json` placed next to the running binary.
-    /// Returns a new `ClientConfig` built from the unified JSON format.
+    /// Returns a new `ClientConfig` built from the JSON format.
     pub fn reload_from_json_near_binary() -> Result<Self> {
         let exe = std::env::current_exe().context("cannot resolve binary path")?;
         let dir = exe.parent().context("cannot resolve binary directory")?;
@@ -157,47 +169,162 @@ impl ClientConfig {
 
         let raw = std::fs::read_to_string(&path)
             .with_context(|| format!("failed to read {}", path.display()))?;
-        let raw: RawUnifiedConfig = serde_json::from_str(&raw)
-            .with_context(|| format!("failed to parse {}", path.display()))?;
+        let mut stripped = json_comments::StripComments::new(raw.as_bytes());
+        let raw_json: serde_json::Value = serde_json::from_reader(&mut stripped)
+            .with_context(|| format!("failed to parse JSON from {}", path.display()))?;
 
-        let is_tun = raw.tun.as_ref().and_then(|t| t.enable).unwrap_or(false);
-        let server = raw.server.unwrap_or_else(|| "127.0.0.1:50000".to_string());
-        let key = raw.access_key.unwrap_or_default();
-        let socks5 = raw.socks5_bind.unwrap_or_else(|| "127.0.0.1:1088".to_string());
-        let exclusions = raw.exclude.unwrap_or(RawExcludeSection {
-            domains: None,
-            ips: None,
-            processes: None,
-        });
-        let mux = raw.mux.unwrap_or(RawMuxSection {
-            enabled: None,
-            sessions: None,
+        let (migrated_json, was_migrated) = Self::migrate_json(raw_json);
+        if was_migrated {
+            tracing::warn!(
+                "Config at {} is in an outdated format. Run 'ostp --migrate' to upgrade it.",
+                path.display()
+            );
+        }
+
+        let config: ClientConfig = serde_json::from_value(migrated_json)
+            .with_context(|| format!("failed to deserialize config from {}", path.display()))?;
+
+        Ok(config)
+    }
+
+    /// Migrates old monolithic JSON to the new modular format.
+    /// Returns the migrated JSON value and a boolean indicating if a migration occurred.
+    pub fn migrate_json(json: serde_json::Value) -> (serde_json::Value, bool) {
+        // Consider the config already migrated if:
+        // 1. Version matches exactly, OR
+        // 2. The JSON already has the new modular format (inbounds + outbounds arrays)
+        let has_version = json.get("version").and_then(|v| v.as_str()) == Some(env!("CARGO_PKG_VERSION"));
+        let has_new_format = json.get("inbounds").and_then(|v| v.as_array()).is_some()
+            && json.get("outbounds").and_then(|v| v.as_array()).is_some();
+        
+        if has_version || has_new_format {
+            // If format is already new but version is old, just bump the version
+            if has_new_format && !has_version {
+                let mut updated = json.clone();
+                updated["version"] = serde_json::json!(env!("CARGO_PKG_VERSION"));
+                return (updated, false);
+            }
+            return (json, false);
+        }
+
+        // Needs migration
+        let mut new_json = serde_json::json!({
+            "version": env!("CARGO_PKG_VERSION"),
         });
 
-        Ok(ClientConfig {
-            mode: if is_tun { "tun".to_string() } else { "proxy".to_string() },
-            debug: raw.debug.unwrap_or(false),
-            ostp: OstpConfig {
-                server_addr: server,
-                local_bind_addr: "0.0.0.0:0".to_string(),
-                access_key: key,
-                handshake_timeout_ms: 10000,
-                io_timeout_ms: 2500,
+        // 1. Log level
+        let log_level = if let Some(ll) = json.get("log_level") {
+            ll.clone()
+        } else if let Some(d) = json.get("debug") {
+            if d.as_bool().unwrap_or(false) { serde_json::json!("debug") } else { serde_json::json!("info") }
+        } else {
+            serde_json::json!("info")
+        };
+        new_json["log"] = serde_json::json!({ "level": log_level });
+
+        // 2. Inbounds
+        let mut inbounds = Vec::new();
+        
+        if let Some(tun) = json.get("tun") {
+            if tun.get("enable").and_then(|v| v.as_bool()).unwrap_or(false) {
+                inbounds.push(serde_json::json!({
+                    "type": "tun",
+                    "tag": "tun-in",
+                    "auto_route": true,
+                    "mtu": 1140
+                }));
+            }
+        }
+
+        let socks_bind = json.get("socks5_bind").and_then(|v| v.as_str()).unwrap_or("127.0.0.1:1088");
+        let parts: Vec<&str> = socks_bind.split(':').collect();
+        let listen = parts.get(0).unwrap_or(&"127.0.0.1");
+        let port = parts.get(1).unwrap_or(&"1088").parse::<u16>().unwrap_or(1088);
+        
+        inbounds.push(serde_json::json!({
+            "type": "local_proxy",
+            "tag": "socks-in",
+            "protocol": "socks",
+            "listen": listen,
+            "port": port
+        }));
+
+        new_json["inbounds"] = serde_json::Value::Array(inbounds);
+
+        // 3. Outbounds
+        let mut outbounds = Vec::new();
+        let server_full = json.get("server").and_then(|v| v.as_str()).unwrap_or("127.0.0.1:50000");
+        let server_parts: Vec<&str> = server_full.split(':').collect();
+        let server_host = server_parts.get(0).unwrap_or(&"127.0.0.1");
+        let server_port = server_parts.get(1).unwrap_or(&"50000").parse::<u16>().unwrap_or(50000);
+        let access_key = json.get("access_key").and_then(|v| v.as_str()).unwrap_or("");
+        
+        let transport_type = json.get("transport").and_then(|t| t.get("mode").or(t.get("type"))).and_then(|v| v.as_str()).unwrap_or("udp");
+        let mux_enabled = json.get("mux").and_then(|m| m.get("enabled")).and_then(|v| v.as_bool()).unwrap_or(false);
+        let mux_sessions = json.get("mux").and_then(|m| m.get("sessions")).and_then(|v| v.as_u64()).unwrap_or(1);
+
+        outbounds.push(serde_json::json!({
+            "type": "ostp",
+            "tag": "proxy",
+            "server": server_host,
+            "port": server_port,
+            "access_key": access_key,
+            "transport": {
+                "type": transport_type
             },
-            local_proxy: LocalProxyConfig {
-                bind_addr: socks5,
-                connect_timeout_ms: 15000,
-            },
-            turn: TurnConfig::default(),
-            exclusions: ExclusionConfig {
-                domains: exclusions.domains.unwrap_or_default(),
-                ips: exclusions.ips.unwrap_or_default(),
-                processes: exclusions.processes.unwrap_or_default(),
-            },
-            multiplex: MultiplexConfig {
-                enabled: mux.enabled.unwrap_or(false),
-                sessions: mux.sessions.unwrap_or(1),
-            },
-        })
+            "multiplex": {
+                "enabled": mux_enabled,
+                "sessions": mux_sessions
+            }
+        }));
+
+        outbounds.push(serde_json::json!({
+            "type": "direct",
+            "tag": "direct"
+        }));
+
+        outbounds.push(serde_json::json!({
+            "type": "block",
+            "tag": "block"
+        }));
+
+        new_json["outbounds"] = serde_json::Value::Array(outbounds);
+
+        // 4. Routing
+        let mut rules = Vec::new();
+
+        // Migrate exclusions to route to direct
+        if let Some(exclude) = json.get("exclude") {
+            if let Some(domains) = exclude.get("domains") {
+                rules.push(serde_json::json!({
+                    "domain_suffix": domains,
+                    "outbound": "direct"
+                }));
+            }
+            if let Some(ips) = exclude.get("ips") {
+                rules.push(serde_json::json!({
+                    "ip_cidr": ips,
+                    "outbound": "direct"
+                }));
+            }
+            if let Some(processes) = exclude.get("processes") {
+                rules.push(serde_json::json!({
+                    "process_name": processes,
+                    "outbound": "direct"
+                }));
+            }
+        }
+
+        new_json["routing"] = serde_json::json!({
+            "rules": rules,
+            "default_outbound": "proxy"
+        });
+
+        // 5. Preserve GUI state
+        if let Some(gui) = json.get("gui") {
+            new_json["gui"] = gui.clone();
+        }
+        
+        (new_json, true)
     }
 }

ostp-client/src/lib.rs

@@ -3,5 +3,9 @@ pub mod bridge;
 pub mod config;
 pub mod signal;
 pub mod sysproxy;
+pub mod transport;
 pub mod tunnel;
+
+
 pub mod runner;
+pub mod logging;

ostp-client/src/logging.rs

@@ -0,0 +1,118 @@
+use std::fs::OpenOptions;
+use std::io::Write;
+use std::path::PathBuf;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
+
+pub fn setup_panic_hook() {
+    std::panic::set_hook(Box::new(|info| {
+        let payload = info.payload();
+        let msg = if let Some(s) = payload.downcast_ref::<&str>() {
+            *s
+        } else if let Some(s) = payload.downcast_ref::<String>() {
+            s.as_str()
+        } else {
+            "Box<dyn Any>"
+        };
+
+        let location = info.location().unwrap_or_else(|| std::panic::Location::caller());
+        let backtrace = std::backtrace::Backtrace::force_capture();
+        
+        let crash_msg = format!(
+            "[{}] PANIC at {}:{}\nMessage: {}\nBacktrace:\n{:?}",
+            chrono::Local::now().format("%Y-%m-%d %H:%M:%S"),
+            location.file(),
+            location.line(),
+            msg,
+            backtrace
+        );
+
+        eprintln!("{}", crash_msg);
+        tracing::error!("{}", crash_msg);
+
+        let path = std::env::current_exe()
+            .ok()
+            .and_then(|p| p.parent().map(|d| d.join("ostp-crash.log")))
+            .unwrap_or_else(|| PathBuf::from("ostp-crash.log"));
+
+        if let Ok(mut file) = OpenOptions::new().create(true).append(true).open(path) {
+            let _ = file.write_all(crash_msg.as_bytes());
+            let _ = file.write_all(b"\n===================================================\n");
+        }
+    }));
+}
+
+/// Initialises tracing and writes to `<app_name>.log` next to the executable.
+///
+/// The `level` parameter controls the minimum log level:
+/// - `"error"` — only errors
+/// - `"warn"`  — warnings and errors
+/// - `"info"`  — informational messages (default)
+/// - `"debug"` — detailed debug messages (use when `debug: true` in config)
+/// - `"trace"` — all messages including very verbose internal state
+///
+/// The environment variable `RUST_LOG` overrides this value if set.
+pub fn init_tracing(level: &str, app_name: &str, version: &str) -> Option<tracing_appender::non_blocking::WorkerGuard> {
+    // RUST_LOG overrides the config-derived level
+    let env_filter = EnvFilter::try_from_default_env()
+        .unwrap_or_else(|_| {
+            // When debug or trace is requested, enable for all ostp crates
+            if level == "debug" || level == "trace" {
+                // Enable the requested level for ostp crates, but keep noisy deps at warn
+                EnvFilter::new(format!(
+                    "warn,ostp_client={level},ostp_core={level},ostp_jni={level},ostp_gui_lib={level}"
+                ))
+            } else {
+                EnvFilter::new(level)
+            }
+        });
+
+    let path = std::env::current_exe()
+        .ok()
+        .and_then(|p| p.parent().map(|d| d.join(format!("{}.log", app_name))))
+        .unwrap_or_else(|| PathBuf::from(format!("{}.log", app_name)));
+
+    if let Ok(file) = OpenOptions::new().create(true).append(true).open(&path) {
+        let (file_writer, guard) = tracing_appender::non_blocking(file);
+        
+        let fmt_layer = tracing_subscriber::fmt::layer()
+            .with_target(true)
+            .with_line_number(true)
+            .with_thread_ids(false)
+            .with_thread_names(false)
+            .with_ansi(false)
+            .with_writer(file_writer);
+            
+        let stderr_layer = tracing_subscriber::fmt::layer()
+            .with_target(true)
+            .with_writer(std::io::stderr);
+
+        let _ = tracing_subscriber::registry()
+            .with(env_filter)
+            .with(fmt_layer)
+            .with(stderr_layer)
+            .try_init();
+            
+        tracing::debug!(
+            "{} v{} | OS: {} | Arch: {} | log_level: {} | log_file: {}",
+            app_name,
+            version,
+            std::env::consts::OS,
+            std::env::consts::ARCH,
+            level,
+            path.display(),
+        );
+        
+        Some(guard)
+    } else {
+        // Fallback: stderr only
+        let stderr_layer = tracing_subscriber::fmt::layer()
+            .with_target(true)
+            .with_writer(std::io::stderr);
+        let _ = tracing_subscriber::registry()
+            .with(EnvFilter::new(level))
+            .with(stderr_layer)
+            .try_init();
+        eprintln!("[WARN] Could not open log file at {}. Logging to stderr only.", path.display());
+        None
+    }
+}

ostp-client/src/runner.rs

@@ -1,226 +1,73 @@
 use anyhow::Result;
-use tokio::sync::{mpsc, watch};
-
-use crate::app::BridgeCommand;
-use crate::bridge::{Bridge, BridgeMetrics};
-use crate::signal::wait_for_shutdown_signal;
-use crate::tunnel;
 use std::sync::Arc;
+use tokio::sync::watch;
 
-#[cfg(target_os = "windows")]
-#[link(name = "kernel32")]
-extern "system" {
-    fn FreeConsole() -> i32;
-    fn GetConsoleWindow() -> *mut std::ffi::c_void;
-}
+use crate::config::{ClientConfig, InboundConfig};
+use crate::tunnel::balancer::Balancer;
+use crate::tunnel::outbounds::OutboundManager;
+use crate::tunnel::router::Router;
 
-#[cfg(target_os = "windows")]
-#[link(name = "user32")]
-extern "system" {
-    fn ShowWindow(hwnd: *mut std::ffi::c_void, cmd_show: i32) -> i32;
-}
+pub async fn run_client_core(
+    config: ClientConfig,
+    _metrics: Arc<crate::bridge::BridgeMetrics>,
+    mut shutdown_rx_ext: watch::Receiver<bool>,
+    _config_rx: Option<watch::Receiver<ClientConfig>>,
+) -> Result<()> {
+    println!("[ostp] Starting run_client_core with multi-server architecture");
 
-fn hide_console() {
-    #[cfg(target_os = "windows")]
-    unsafe {
-        let hwnd = GetConsoleWindow();
-        if !hwnd.is_null() {
-            ShowWindow(hwnd, 0); // SW_HIDE = 0
-        }
-        FreeConsole();
-    }
-}
+    let router = Arc::new(Router::new(config.routing.clone()));
+    let balancer = Arc::new(Balancer::new(&config));
     
-#[cfg(target_os = "windows")]
-fn is_admin() -> bool {
-    std::process::Command::new("net")
-        .arg("session")
-        .stdout(std::process::Stdio::null())
-        .stderr(std::process::Stdio::null())
-        .status()
-        .map(|s| s.success())
-        .unwrap_or(false)
-}
+    // TODO: Detect physical interface index for bypassing
+    let phys_if_for_bypass = None;
+    let outbound_manager = Arc::new(OutboundManager::new(balancer.clone(), phys_if_for_bypass, None));
 
-#[cfg(target_os = "windows")]
-fn relaunch_as_admin() -> Result<()> {
-    let current_exe = std::env::current_exe()?;
-    let exe_str = current_exe.to_string_lossy().replace('\'', "''");
+    let mut handles = Vec::new();
 
-    let current_dir = std::env::current_dir()?;
-    let dir_str = current_dir.to_string_lossy().replace('\'', "''");
+    for inbound in config.inbounds.clone() {
+        let router_clone = router.clone();
+        let outbound_manager_clone = outbound_manager.clone();
+        let shutdown_rx = shutdown_rx_ext.clone();
+        let config_clone = config.clone();
 
-    let mut arg_parts = Vec::new();
-    for arg in std::env::args().skip(1) {
-        arg_parts.push(format!("'{}'", arg.replace('\'', "''")));
-    }
-
-    let arg_list_str = if !arg_parts.is_empty() {
-        format!("-ArgumentList {}", arg_parts.join(","))
-    } else {
-        String::new()
-    };
-
-    let ps_script = format!(
-        "Start-Process -FilePath '{}' {} -WorkingDirectory '{}' -Verb RunAs",
-        exe_str, arg_list_str, dir_str
-    );
-
-    let _ = std::process::Command::new("powershell")
-        .args(["-Command", &ps_script])
-        .spawn()?;
-    std::process::exit(0);
-}
-
-pub async fn run_client(config: crate::config::ClientConfig) -> Result<()> {
-    let bg = std::env::args().any(|a| a == "--bg");
-
-    if bg {
-        hide_console();
-    }
-
-    #[cfg(target_os = "windows")]
-    if config.mode == "tun" && !is_admin() {
-        println!("[ostp-client] TUN mode requires Administrator privileges. Relaunching as Admin...");
-        relaunch_as_admin()?;
-    }
-
-    if config.mode == "tun" && !config.exclusions.processes.is_empty() {
-        println!("[ostp-client] WARNING: process exclusions are not supported in the current TUN implementation");
-    }
-
-    if config.mode == "tun" {
-        tunnel::download_wintun_dll(config.debug)?;
-        tunnel::download_tun2socks(config.debug)?;
-    }
-
-    let (proxy_events_tx, proxy_events_rx) = mpsc::channel(10000);
-    let (client_msgs_tx, client_msgs_rx) = mpsc::channel(10000);
-
-    let metrics = Arc::new(BridgeMetrics {
-        bytes_sent: portable_atomic::AtomicU64::new(0),
-        bytes_recv: portable_atomic::AtomicU64::new(0),
-    });
-
-    let bridge = Bridge::new(&config, metrics)?;
-
-    let (ui_tx, mut ui_rx) = mpsc::channel(512);
-    let (cmd_tx, cmd_rx) = mpsc::channel(128);
-    let (shutdown_tx, shutdown_rx) = watch::channel(false);
-    let proxy_shutdown_rx = shutdown_tx.subscribe();
-
-    let is_tun = config.mode == "tun";
-
-    // Auto-connect on startup
-    let _ = cmd_tx.send(BridgeCommand::ToggleTunnel).await;
-
-    let debug_enabled = config.debug;
-
-    // Headless event logger
-    let cmd_tx_clone = cmd_tx.clone();
-    tokio::spawn(async move {
-        let mut last_status = None;
-        while let Some(msg) = ui_rx.recv().await {
-            match msg {
-                crate::app::UiEvent::Log(text) => {
-                    if debug_enabled || is_essential_log(&text) {
-                        println!("[client] {text}");
+        match inbound.clone() {
+            InboundConfig::Tun { .. } => {
+                handles.push(tokio::spawn(async move {
+                    if let Err(e) = crate::tunnel::inbounds::tun::run_tun_inbound(
+                        config_clone,
+                        inbound,
+                        router_clone,
+                        outbound_manager_clone,
+                        shutdown_rx,
+                    ).await {
+                        tracing::error!("TUN inbound failed: {}", e);
                     }
-                }
-                crate::app::UiEvent::Metrics { status, rtt_ms, .. } => {
-                    let status_str = status.as_str().to_string();
-                    if last_status != Some(status_str.clone()) {
-                        last_status = Some(status_str.clone());
-                        println!("[client] status={status_str} rtt_ms={:.1}", rtt_ms);
+                }));
+            }
+            InboundConfig::LocalProxy { .. } => {
+                handles.push(tokio::spawn(async move {
+                    if let Err(e) = crate::tunnel::inbounds::local_proxy::run_socks_inbound(
+                        config_clone,
+                        inbound,
+                        router_clone,
+                        outbound_manager_clone,
+                        shutdown_rx,
+                    ).await {
+                        tracing::error!("SOCKS inbound failed: {}", e);
                     }
-                }
-                crate::app::UiEvent::Traffic { .. } => {}
-                crate::app::UiEvent::ProfileChanged(profile) => {
-                    if debug_enabled {
-                        println!("[client] profile={profile:?}");
-                    }
-                }
-                crate::app::UiEvent::TunnelStopped => {
-                    if is_tun {
-                        println!("[client] tunnel=tun stopped, reconnecting in 5s");
-                    } else {
-                        println!("[client] tunnel=proxy stopped, reconnecting in 5s");
-                    }
-                    let cmd_tx_inner = cmd_tx_clone.clone();
-                    tokio::spawn(async move {
-                        tokio::time::sleep(tokio::time::Duration::from_secs(5)).await;
-                        let _ = cmd_tx_inner.send(BridgeCommand::ToggleTunnel).await;
-                    });
-                }
+                }));
+            }
+        }
+    }
+
+    // Wait for shutdown or for tasks to fail
+    tokio::select! {
+        _ = shutdown_rx_ext.changed() => {
+            if *shutdown_rx_ext.borrow() {
+                tracing::info!("Shutdown signal received in run_client_core");
             }
         }
-    });
-
-    let bridge_task = tokio::spawn(async move {
-        bridge.run(ui_tx, cmd_rx, shutdown_rx, proxy_events_rx, client_msgs_tx).await
-    });
-
-    let config_clone = config.clone();
-    let proxy_task = tokio::spawn(async move {
-        tunnel::run_local_proxy(
-            config.local_proxy,
-            config.ostp,
-            config.exclusions,
-            config.debug,
-            proxy_shutdown_rx,
-            proxy_events_tx,
-            client_msgs_rx,
-        )
-        .await
-    });
-
-    let wintun_shutdown_rx = shutdown_tx.subscribe();
-    let wintun_task = if config_clone.mode == "tun" {
-        Some(tokio::spawn(async move {
-            tunnel::run_wintun_tunnel(config_clone, wintun_shutdown_rx).await
-        }))
-    } else {
-        None
-    };
-
-    // Wait for Ctrl-C / signal
-    wait_for_shutdown_signal().await?;
-    let _ = cmd_tx.send(BridgeCommand::Shutdown).await;
-
-    let _ = shutdown_tx.send(true);
-    let _ = bridge_task.await?;
-    let _ = proxy_task.await?;
-    if let Some(task) = wintun_task {
-        let _ = task.await?;
     }
-    tunnel::cleanup().await?;
 
     Ok(())
 }
-
-#[allow(dead_code)]
-fn format_bytes(bps: u64) -> String {
-    if bps >= 1_000_000 {
-        format!("{:.1}MB", bps as f64 / 1_000_000.0)
-    } else if bps >= 1_000 {
-        format!("{:.1}KB", bps as f64 / 1_000.0)
-    } else {
-        format!("{bps}B")
-    }
-}
-
-fn is_essential_log(text: &str) -> bool {
-    matches!(
-        text,
-        "Handshaking started"
-            | "Bridge connection established"
-            | "TUN Tunnel established"
-            | "Bridge stopped"
-            | "TUN Tunnel stopped"
-            | "Runtime config reloaded"
-    ) || text.starts_with("Connected UDP directly to ")
-        || text.starts_with("TURN: Relay allocated")
-        || text.starts_with("TURN allocation failed")
-        || text.starts_with("Handshake failed")
-        || text.starts_with("Connection timeout")
-}

ostp-client/src/signal.rs

@@ -8,8 +8,12 @@ pub async fn wait_for_shutdown_signal() -> Result<()> {
     let mut sigint = signal(SignalKind::interrupt())?;
 
     tokio::select! {
-        _ = sigterm.recv() => {}
-        _ = sigint.recv() => {}
+        _ = sigterm.recv() => {
+            tracing::info!("Received SIGTERM, shutting down");
+        }
+        _ = sigint.recv() => {
+            tracing::info!("Received SIGINT, shutting down");
+        }
     }
 
     Ok(())
@@ -17,6 +21,37 @@ pub async fn wait_for_shutdown_signal() -> Result<()> {
 
 #[cfg(not(unix))]
 pub async fn wait_for_shutdown_signal() -> Result<()> {
-    tokio::signal::ctrl_c().await?;
+    #[cfg(target_os = "windows")]
+    {
+        use tokio::signal::windows::{ctrl_break, ctrl_c, ctrl_close};
+        let mut c_c = ctrl_c()?;
+        let mut c_close = ctrl_close()?;
+        let mut c_break = ctrl_break()?;
+
+        tokio::select! {
+            res = c_c.recv() => {
+                tracing::info!("Received Ctrl+C, shutting down");
+                if res.is_none() {
+                    std::future::pending::<()>().await;
+                }
+            }
+            res = c_close.recv() => {
+                tracing::info!("Received console close event, shutting down");
+                if res.is_none() {
+                    std::future::pending::<()>().await;
+                }
+            }
+            res = c_break.recv() => {
+                tracing::info!("Received Ctrl+Break, shutting down");
+                if res.is_none() {
+                    std::future::pending::<()>().await;
+                }
+            }
+        }
+    }
+    #[cfg(not(target_os = "windows"))]
+    {
+        tokio::signal::ctrl_c().await?;
+    }
     Ok(())
 }

ostp-client/src/sysproxy.rs

@@ -1,6 +1,12 @@
 #[cfg(target_os = "windows")]
 use std::process::Command;
 
+#[cfg(target_os = "windows")]
+use std::os::windows::process::CommandExt;
+
+#[cfg(target_os = "windows")]
+const CREATE_NO_WINDOW: u32 = 0x08000000;
+
 #[cfg(target_os = "windows")]
 #[link(name = "wininet")]
 extern "system" {
@@ -18,50 +24,143 @@ const INTERNET_OPTION_REFRESH: u32 = 37;
 
 #[cfg(target_os = "windows")]
 pub fn enable_windows_proxy(proxy_addr: &str) {
-    let _ = Command::new("reg")
+    tracing::info!("Enabling Windows system proxy: {}", proxy_addr);
+
+    let result = Command::new("reg")
+        .creation_flags(CREATE_NO_WINDOW)
         .args([
             "add",
             "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings",
-            "/v",
-            "ProxyEnable",
-            "/t",
-            "REG_DWORD",
-            "/d",
-            "1",
+            "/v", "ProxyEnable",
+            "/t", "REG_DWORD",
+            "/d", "1",
             "/f",
         ])
         .output();
+    match result {
+        Ok(out) if !out.status.success() => {
+            tracing::error!("Failed to set ProxyEnable: {}", String::from_utf8_lossy(&out.stderr));
+        }
+        Err(e) => tracing::error!("Failed to execute reg.exe (ProxyEnable): {}", e),
+        _ => {}
+    }
 
-    let proxy_str = proxy_addr.to_string();
-    let _ = Command::new("reg")
+    let result = Command::new("reg")
+        .creation_flags(CREATE_NO_WINDOW)
         .args([
             "add",
             "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings",
-            "/v",
-            "ProxyServer",
-            "/t",
-            "REG_SZ",
-            "/d",
-            &proxy_str,
+            "/v", "ProxyServer",
+            "/t", "REG_SZ",
+            "/d", proxy_addr,
             "/f",
         ])
         .output();
+    match result {
+        Ok(out) if !out.status.success() => {
+            tracing::error!("Failed to set ProxyServer: {}", String::from_utf8_lossy(&out.stderr));
+        }
+        Err(e) => tracing::error!("Failed to execute reg.exe (ProxyServer): {}", e),
+        _ => {}
+    }
 
+    // Set initial bypass list (will be expanded by update_proxy_bypass_list)
+    update_proxy_bypass_list_windows(&[], &[]);
+
+    refresh_wininet();
+    tracing::info!("System proxy enabled successfully");
+}
+
+/// Update the Windows ProxyOverride registry value to include user-configured
+/// excluded domains and IPs. This makes excluded hosts bypass the OSTP proxy
+/// entirely at the OS level — the most reliable split-tunneling mechanism.
+///
+/// For each domain `d`, adds both `d` and `*.d` so both the root and all
+/// subdomains bypass the proxy.
+/// For IPs, adds them verbatim (Windows supports exact IPs and wildcards like
+/// `192.168.*`).
+#[cfg(target_os = "windows")]
+pub fn update_proxy_bypass_list(domains: &[String], ips: &[String]) {
+    update_proxy_bypass_list_windows(domains, ips);
     refresh_wininet();
 }
 
+#[cfg(not(target_os = "windows"))]
+pub fn update_proxy_bypass_list(_domains: &[String], _ips: &[String]) {
+    // Linux/macOS: no-op (gnome/kde proxy bypass list update not implemented)
+}
+
 #[cfg(target_os = "windows")]
-pub fn disable_windows_proxy() {
+fn update_proxy_bypass_list_windows(domains: &[String], ips: &[String]) {
+    // Base list: always bypass local addresses
+    let mut parts: Vec<String> = vec![
+        "localhost".into(),
+        "127.*".into(),
+        "10.*".into(),
+        "172.16.*".into(),
+        "172.17.*".into(),
+        "172.18.*".into(),
+        "172.19.*".into(),
+        "172.20.*".into(),
+        "172.21.*".into(),
+        "172.22.*".into(),
+        "172.23.*".into(),
+        "172.24.*".into(),
+        "172.25.*".into(),
+        "172.26.*".into(),
+        "172.27.*".into(),
+        "172.28.*".into(),
+        "172.29.*".into(),
+        "172.30.*".into(),
+        "172.31.*".into(),
+        "192.168.*".into(),
+        "<local>".into(),
+    ];
+
+    // Add excluded domains: both exact and wildcard subdomain form
+    for d in domains {
+        let d = d.trim().trim_start_matches('.').to_lowercase();
+        if d.is_empty() { continue; }
+        parts.push(d.clone());
+        parts.push(format!("*.{}", d));
+    }
+
+    // Add excluded IPs verbatim
+    for ip in ips {
+        let ip = ip.trim();
+        if ip.is_empty() { continue; }
+        // Strip CIDR suffix if present — Windows ProxyOverride doesn't support CIDR
+        let host = ip.split('/').next().unwrap_or(ip);
+        parts.push(host.to_string());
+    }
+
+    let override_value = parts.join(";");
+    tracing::info!("Updating ProxyOverride: {}", override_value);
+
     let _ = Command::new("reg")
+        .creation_flags(CREATE_NO_WINDOW)
         .args([
             "add",
             "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings",
-            "/v",
-            "ProxyEnable",
-            "/t",
-            "REG_DWORD",
-            "/d",
-            "0",
+            "/v", "ProxyOverride",
+            "/t", "REG_SZ",
+            "/d", &override_value,
+            "/f",
+        ])
+        .output();
+}
+
+#[cfg(target_os = "windows")]
+pub fn disable_system_proxy() {
+    tracing::info!("Disabling Windows system proxy");
+    let _ = Command::new("reg")
+        .creation_flags(CREATE_NO_WINDOW)
+        .args([
+            "add",
+            "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings",
+            "/v", "ProxyEnable",
+            "/t", "REG_DWORD",
+            "/d", "0",
             "/f",
         ])
         .output();
@@ -88,26 +187,92 @@ fn refresh_wininet() {
 }
 
 #[cfg(not(target_os = "windows"))]
-pub fn enable_windows_proxy(_proxy_addr: &str) {}
+pub fn enable_system_proxy(proxy_addr: &str) {
+    let parts: Vec<&str> = proxy_addr.split(':').collect();
+    let host = parts.get(0).unwrap_or(&"127.0.0.1");
+    let port = parts.get(1).unwrap_or(&"1088");
+
+    let is_gui = std::env::var("DISPLAY").is_ok() || std::env::var("WAYLAND_DISPLAY").is_ok();
+
+    if is_gui {
+        tracing::info!("Enabling Linux system proxy (GNOME/KDE): {}", proxy_addr);
+        
+        // Try GNOME gsettings
+        let gnome_res = std::process::Command::new("gsettings")
+            .args(["set", "org.gnome.system.proxy", "mode", "manual"])
+            .output();
+            
+        if let Ok(out) = gnome_res {
+            if out.status.success() {
+                let _ = std::process::Command::new("gsettings").args(["set", "org.gnome.system.proxy.socks", "host", host]).output();
+                let _ = std::process::Command::new("gsettings").args(["set", "org.gnome.system.proxy.socks", "port", port]).output();
+                let _ = std::process::Command::new("gsettings").args(["set", "org.gnome.system.proxy", "ignore-hosts", "['localhost', '127.0.0.0/8', '10.0.0.0/8', '192.168.0.0/16']"]).output();
+                tracing::info!("GNOME system proxy enabled.");
+                return;
+            }
+        }
+
+        // Try KDE kwriteconfig5/6
+        for cmd in ["kwriteconfig5", "kwriteconfig6"] {
+            let kde_res = std::process::Command::new(cmd)
+                .args(["--file", "kioslaverc", "--group", "Proxy Settings", "--key", "ProxyType", "1"])
+                .output();
+                
+            if let Ok(out) = kde_res {
+                if out.status.success() {
+                    let socks_val = format!("socks://{}:{}", host, port);
+                    let _ = std::process::Command::new(cmd).args(["--file", "kioslaverc", "--group", "Proxy Settings", "--key", "socksProxy", &socks_val]).output();
+                    let _ = std::process::Command::new("dbus-send").args(["--type=signal", "/KIO/Scheduler", "org.kde.KIO.Scheduler.reparseSlaveConfiguration", "string:''"]).output();
+                    tracing::info!("KDE system proxy enabled.");
+                    return;
+                }
+            }
+        }
+    }
+
+    // Headless fallback
+    println!("\n===================================================================");
+    println!("OSTP Local Proxy is running at socks5://{}", proxy_addr);
+    println!("Since you are in a headless/terminal environment, OSTP cannot automatically");
+    println!("configure your system proxy. To route traffic from this terminal, run:");
+    println!("\n    eval $(ostp --proxy-env)\n");
+    println!("Or configure your application (e.g. curl -x socks5://{})", proxy_addr);
+    println!("===================================================================\n");
+}
 
 #[cfg(not(target_os = "windows"))]
-pub fn disable_windows_proxy() {}
+pub fn disable_system_proxy() {
+    let is_gui = std::env::var("DISPLAY").is_ok() || std::env::var("WAYLAND_DISPLAY").is_ok();
+    if is_gui {
+        tracing::info!("Disabling Linux system proxy...");
+        let _ = std::process::Command::new("gsettings").args(["set", "org.gnome.system.proxy", "mode", "none"]).output();
+        let _ = std::process::Command::new("kwriteconfig5").args(["--file", "kioslaverc", "--group", "Proxy Settings", "--key", "ProxyType", "0"]).output();
+        let _ = std::process::Command::new("kwriteconfig6").args(["--file", "kioslaverc", "--group", "Proxy Settings", "--key", "ProxyType", "0"]).output();
+        let _ = std::process::Command::new("dbus-send").args(["--type=signal", "/KIO/Scheduler", "org.kde.KIO.Scheduler.reparseSlaveConfiguration", "string:''"]).output();
+    }
+}
 
-pub struct WindowsProxyGuard {
+#[cfg(target_os = "windows")]
+pub fn enable_system_proxy(proxy_addr: &str) {
+    enable_windows_proxy(proxy_addr);
+}
+
+
+pub struct SystemProxyGuard {
     active: bool,
 }
 
-impl WindowsProxyGuard {
+impl SystemProxyGuard {
     pub fn enable(proxy_addr: &str) -> Self {
-        enable_windows_proxy(proxy_addr);
+        enable_system_proxy(proxy_addr);
         Self { active: true }
     }
 }
 
-impl Drop for WindowsProxyGuard {
+impl Drop for SystemProxyGuard {
     fn drop(&mut self) {
         if self.active {
-            disable_windows_proxy();
+            disable_system_proxy();
         }
     }
 }

ostp-client/src/transport/dns.rs

@@ -0,0 +1,230 @@
+/// DNS tunnel transport — dnstt-style implementation.
+///
+/// Protocol (client → server, embedded in DNS query domain name):
+///   Base32([client_id: 8][msg_id: 2 BE][total_frags: 1][frag_idx: 1][payload: ≤MAX_CHUNK])
+///   Split into DNS labels of max 63 chars, suffixed with base_domain.
+///
+/// Poll query: payload is empty (total_frags=1, frag_idx=0, len=0).
+///
+/// Protocol (server → client, in TXT rdata):
+///   Concatenated length-prefixed OSTP packets: [len: 2 BE][data ...]...
+///
+/// Polling: adaptive 500ms → 10s, like dnstt. Resets to 500ms on real data.
+use std::collections::HashMap;
+use std::sync::Arc;
+use std::time::Duration;
+use bytes::Bytes;
+use rand::Rng;
+use tokio::net::UdpSocket;
+use tokio::sync::{mpsc, Mutex};
+use crate::transport::Transport;
+use rand::RngCore;
+use ostp_core::dns::{base32_encode, DnsPacket, DnsRecordType};
+
+/// Max raw payload bytes we put into one DNS query.
+/// Calculation: FQDN ≤ 253 chars. Domain suffix ~30 chars max.
+/// Remaining: ~220 chars for base32 labels. 220/8*5 = 137 bytes raw.
+/// Header = 12 bytes → payload ≤ 120 bytes (conservative, works for any domain ≤ 40 chars).
+const MAX_CHUNK_PAYLOAD: usize = 120;
+const CLIENT_ID_LEN: usize = 8;
+const INIT_POLL_DELAY: Duration = Duration::from_millis(500);
+const MAX_POLL_DELAY: Duration = Duration::from_secs(10);
+const POLL_DELAY_MULTIPLIER: f64 = 2.0;
+
+pub async fn start_dns_transport(
+    domain: String,
+    resolver: String,
+    _pubkey: Option<String>,
+) -> std::io::Result<Transport> {
+    let (app_tx, transport_rx) = mpsc::channel::<Bytes>(256);
+    let (transport_tx, app_rx) = mpsc::channel::<Bytes>(256);
+
+    let resolver_addr = if resolver.contains(':') {
+        resolver.clone()
+    } else {
+        format!("{}:53", resolver)
+    };
+
+    let socket = UdpSocket::bind("0.0.0.0:0").await?;
+    socket.connect(&resolver_addr).await?;
+    let socket = Arc::new(socket);
+
+    // Generate random ClientID for this tunnel session
+    let mut client_id = [0u8; CLIENT_ID_LEN];
+    rand::thread_rng().fill_bytes(&mut client_id);
+    let client_id = Arc::new(client_id);
+
+    tracing::info!("DNS transport: domain={} resolver={} client_id={}",
+        domain, resolver_addr,
+        hex::encode(client_id.as_slice()));
+
+    // ── Send task ─────────────────────────────────────────────────────────────
+    let sock_send = socket.clone();
+    let cid_send = client_id.clone();
+    let domain_send = domain.clone();
+    tokio::spawn(async move {
+        let mut rx = transport_rx;
+        let mut msg_id: u16 = 0;
+        let mut poll_delay = INIT_POLL_DELAY;
+
+        loop {
+            let data: Option<Bytes> = tokio::select! {
+                data = rx.recv() => data,
+                _ = tokio::time::sleep(poll_delay) => {
+                    poll_delay = Duration::from_secs_f64(
+                        (poll_delay.as_secs_f64() * POLL_DELAY_MULTIPLIER)
+                            .min(MAX_POLL_DELAY.as_secs_f64())
+                    );
+                    // Send poll (empty payload)
+                    Some(Bytes::new())
+                }
+            };
+
+            let data = match data {
+                Some(d) => d,
+                None => {
+                    tracing::debug!("DNS send task: channel closed, exiting");
+                    break;
+                }
+            };
+
+            if data.is_empty() {
+                // Poll query — one empty chunk
+                if let Err(e) = send_chunk(&sock_send, &cid_send, msg_id, 1, 0, &[], &domain_send).await {
+                    tracing::warn!("DNS poll send error: {}", e);
+                }
+            } else {
+                // Real OSTP packet — fragment into chunks
+                poll_delay = INIT_POLL_DELAY; // reset on real data
+
+                let data_slice = data.as_ref();
+                let total_chunks = data_slice.chunks(MAX_CHUNK_PAYLOAD).count();
+                let total_u8 = total_chunks.min(255) as u8;
+
+                for (idx, chunk) in data_slice.chunks(MAX_CHUNK_PAYLOAD).enumerate() {
+                    if let Err(e) = send_chunk(
+                        &sock_send, &cid_send,
+                        msg_id, total_u8, idx as u8,
+                        chunk, &domain_send,
+                    ).await {
+                        tracing::warn!("DNS chunk send error (idx={}): {}", idx, e);
+                        break;
+                    }
+                    // Brief inter-fragment delay to avoid flooding the resolver
+                    if total_chunks > 1 {
+                        tokio::time::sleep(Duration::from_millis(20)).await;
+                    }
+                }
+                msg_id = msg_id.wrapping_add(1);
+            }
+        }
+    });
+
+    // ── Receive task ──────────────────────────────────────────────────────────
+    let sock_recv = socket.clone();
+    let tx_recv = transport_tx.clone();
+    let domain_recv = domain.clone();
+    tokio::spawn(async move {
+        let mut buf = vec![0u8; 65535];
+        // Reassembly buffers: msg_id → (total, Vec<Option<chunk>>)
+        let reassembly: HashMap<u16, (u8, Vec<Option<Vec<u8>>>)> = HashMap::new();
+
+        loop {
+            match sock_recv.recv(&mut buf).await {
+                Ok(n) => {
+                    let Some(pkt) = DnsPacket::decode(&buf[..n]) else { continue };
+
+                    // Only process DNS responses
+                    if pkt.flags & 0x8000 == 0 { continue; }
+
+                    for answer in pkt.answers {
+                        if answer.rtype != DnsRecordType::TXT && answer.rtype != DnsRecordType::NULL {
+                            continue;
+                        }
+                        let rdata = answer.rdata;
+                        // Parse length-prefixed OSTP packets packed in rdata:
+                        // [len_hi: 1][len_lo: 1][data: len]...
+                        let mut pos = 0;
+                        while pos + 2 <= rdata.len() {
+                            let pkt_len = u16::from_be_bytes([rdata[pos], rdata[pos + 1]]) as usize;
+                            pos += 2;
+                            if pkt_len == 0 { continue; }
+                            if pos + pkt_len > rdata.len() {
+                                tracing::debug!("DNS recv: truncated packet in rdata");
+                                break;
+                            }
+                            let payload = Bytes::copy_from_slice(&rdata[pos..pos + pkt_len]);
+                            pos += pkt_len;
+
+                            if tx_recv.send(payload).await.is_err() {
+                                return; // app closed
+                            }
+                        }
+                    }
+
+                    // Also check for responses packed in the server's extra DNS answer rdata
+                    // that use our fragmentation scheme (server→client fragments)
+                    // This is handled above via the length-prefix protocol.
+                    let _ = &reassembly; // Keep for future upstream fragmentation support
+                    let _ = &domain_recv;
+                }
+                Err(e) => {
+                    tracing::warn!("DNS transport recv error: {}", e);
+                    break;
+                }
+            }
+        }
+    });
+
+    Ok(Transport::Dns {
+        tx: app_tx,
+        rx: Arc::new(Mutex::new(app_rx)),
+    })
+}
+
+/// Build and send one DNS TXT query with a framed chunk.
+///
+/// Frame format (before base32 encoding):
+///   [client_id: 8][msg_id: 2 BE][total_frags: 1][frag_idx: 1][payload: 0–120]
+async fn send_chunk(
+    socket: &UdpSocket,
+    client_id: &[u8; CLIENT_ID_LEN],
+    msg_id: u16,
+    total_frags: u8,
+    frag_idx: u8,
+    payload: &[u8],
+    base_domain: &str,
+) -> std::io::Result<()> {
+    // Build frame
+    let mut frame = Vec::with_capacity(CLIENT_ID_LEN + 4 + payload.len());
+    frame.extend_from_slice(client_id);
+    frame.extend_from_slice(&msg_id.to_be_bytes());
+    frame.push(total_frags);
+    frame.push(frag_idx);
+    frame.extend_from_slice(payload);
+
+    // Base32-encode
+    let encoded = base32_encode(&frame);
+
+    // Split into 63-char labels and append domain
+    let mut fqdn = String::with_capacity(encoded.len() + base_domain.len() + 10);
+    let mut start = 0;
+    while start < encoded.len() {
+        let end = (start + 63).min(encoded.len());
+        fqdn.push_str(&encoded[start..end]);
+        fqdn.push('.');
+        start = end;
+    }
+    fqdn.push_str(base_domain);
+
+    // Build DNS TXT query with random ID
+    let id: u16 = rand::thread_rng().gen();
+    let pkt = DnsPacket::new_query(id, &fqdn, DnsRecordType::TXT);
+    let wire = pkt.encode();
+
+    tracing::trace!("DNS send chunk: msg_id={} frag={}/{} payload={}B fqdn_len={}",
+        msg_id, frag_idx + 1, total_frags, payload.len(), fqdn.len());
+
+    socket.send(&wire).await?;
+    Ok(())
+}

ostp-client/src/transport/mod.rs

@@ -0,0 +1,60 @@
+pub mod dns;
+use std::sync::Arc;
+use tokio::net::UdpSocket;
+use bytes::Bytes;
+
+#[derive(Clone)]
+pub enum Transport {
+    Udp(Arc<UdpSocket>),
+    Uot {
+        tx: tokio::sync::mpsc::Sender<Bytes>,
+        rx: Arc<tokio::sync::Mutex<tokio::sync::mpsc::Receiver<Bytes>>>,
+    },
+    Dns {
+        tx: tokio::sync::mpsc::Sender<Bytes>,
+        rx: Arc<tokio::sync::Mutex<tokio::sync::mpsc::Receiver<Bytes>>>,
+    }
+}
+
+impl Transport {
+    pub async fn send(&self, frame: &Bytes) -> std::io::Result<usize> {
+        match self {
+            Self::Udp(sock) => sock.send(frame).await,
+            Self::Uot { tx, .. } | Self::Dns { tx, .. } => {
+                tx.send(frame.clone()).await.map_err(|_| std::io::Error::new(std::io::ErrorKind::BrokenPipe, "channel closed"))?;
+                Ok(frame.len())
+            }
+        }
+    }
+
+    pub async fn send_to(&self, frame: &Bytes, target: std::net::SocketAddr) -> std::io::Result<usize> {
+        match self {
+            Self::Udp(sock) => sock.send_to(frame, target).await,
+            Self::Uot { .. } | Self::Dns { .. } => self.send(frame).await,
+        }
+    }
+
+    pub async fn recv(&self, buf: &mut [u8]) -> std::io::Result<usize> {
+        match self {
+            Self::Udp(sock) => sock.recv(buf).await,
+            Self::Uot { rx, .. } | Self::Dns { rx, .. } => {
+                let mut rx = rx.lock().await;
+                match rx.recv().await {
+                    Some(bytes) => {
+                        let len = bytes.len().min(buf.len());
+                        buf[..len].copy_from_slice(&bytes[..len]);
+                        Ok(len)
+                    }
+                    None => Err(std::io::Error::new(std::io::ErrorKind::BrokenPipe, "channel closed")),
+                }
+            }
+        }
+    }
+
+    pub fn local_addr(&self) -> std::io::Result<std::net::SocketAddr> {
+        match self {
+            Self::Udp(sock) => sock.local_addr(),
+            Self::Uot { .. } | Self::Dns { .. } => Ok("0.0.0.0:0".parse().unwrap()),
+        }
+    }
+}

ostp-client/src/transport/xhttp.rs

@@ -0,0 +1,394 @@
+use std::net::IpAddr;
+use std::sync::Arc;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::TcpStream;
+use bytes::{Buf, BufMut, Bytes, BytesMut};
+use anyhow::{Result, Context};
+use tokio::sync::mpsc;
+use hmac::Hmac;
+use sha2::Sha256;
+use base64::Engine;
+use std::pin::Pin;
+use std::task::{Context as TaskContext, Poll};
+use x25519_dalek::PublicKey;
+use chacha20poly1305::{aead::Aead, ChaCha20Poly1305, Nonce};
+
+use ostp_core::crypto::reality::{build_client_hello, derive_keys, generate_session_id, generate_x25519_keypair, REALITY_SERVER_HANDSHAKE_RECORDS};
+use ostp_core::framing::wss::{encode_wss_frame, decode_wss_frame, WssFrameResult};
+
+type HmacSha256 = Hmac<Sha256>;
+
+pub async fn connect_xhttp(
+    target_ip: IpAddr,
+    port: u16,
+    sni: &str,
+    access_key: &[u8],
+    reality_enabled: bool,
+    wss: bool,
+    reality_pbk: &str,
+    reality_sid: &str,
+) -> Result<(mpsc::Sender<Bytes>, Arc<tokio::sync::Mutex<mpsc::Receiver<Bytes>>>)> {
+    let addr = std::net::SocketAddr::new(target_ip, port);
+    
+    #[cfg(not(target_os = "android"))]
+    let mut tcp_stream = tokio::time::timeout(
+        std::time::Duration::from_secs(10),
+        tokio::net::TcpStream::connect(addr),
+    )
+    .await
+    .map_err(|_| anyhow::anyhow!("TCP connect timeout to {}", addr))?
+    .with_context(|| format!("failed to connect to {}", addr))?;
+
+    #[cfg(target_os = "android")]
+    let mut tcp_stream = {
+        let domain = if target_ip.is_ipv6() { socket2::Domain::IPV6 } else { socket2::Domain::IPV4 };
+        let sock = socket2::Socket::new(domain, socket2::Type::STREAM, Some(socket2::Protocol::TCP))?;
+        
+        use std::os::unix::io::AsRawFd;
+        crate::bridge::protect_socket(sock.as_raw_fd());
+        
+        sock.set_nonblocking(true)?;
+        let tcp_socket = tokio::net::TcpSocket::from_std_stream(sock.into());
+        tokio::time::timeout(
+            std::time::Duration::from_secs(10),
+            tcp_socket.connect(addr),
+        )
+        .await
+        .map_err(|_| anyhow::anyhow!("TCP connect timeout to {}", addr))?
+        .with_context(|| format!("failed to connect to {}", addr))?
+    };
+
+    tcp_stream.set_nodelay(true)?;
+
+    if reality_enabled {
+        let pbk_bytes = base64::engine::general_purpose::URL_SAFE_NO_PAD.decode(reality_pbk)
+            .context("invalid reality_pbk base64")?;
+        if pbk_bytes.len() != 32 {
+            anyhow::bail!("reality_pbk must be 32 bytes");
+        }
+        let pbk = PublicKey::from(<[u8; 32]>::try_from(pbk_bytes.as_slice()).unwrap());
+        
+        let sid_bytes_vec = hex::decode(reality_sid).context("invalid reality_sid hex")?;
+        if sid_bytes_vec.len() != 8 {
+            anyhow::bail!("reality_sid must be 8 bytes");
+        }
+        let sid: [u8; 8] = sid_bytes_vec.try_into().unwrap();
+
+        let (c_priv, c_pub) = generate_x25519_keypair();
+        let shared_secret = c_priv.diffie_hellman(&pbk);
+        let (auth_key, data_key) = derive_keys(shared_secret.as_bytes());
+
+        let session_id = generate_session_id(&auth_key, &sid);
+        let client_hello = build_client_hello(if sni.is_empty() { "www.microsoft.com" } else { sni }, &session_id, &c_pub);
+        
+        tcp_stream.write_all(&client_hello).await?;
+        
+        // Drain all server handshake records (ServerHello, CCS, fake encrypted records).
+        // The server sends exactly REALITY_SERVER_HANDSHAKE_RECORDS records before data starts.
+        // Reading them explicitly prevents RealityStream from seeing non-AppData bytes.
+        for i in 0..REALITY_SERVER_HANDSHAKE_RECORDS {
+            let mut head = [0u8; 5];
+            tcp_stream.read_exact(&mut head).await
+                .with_context(|| format!("reality handshake: failed reading record {} header", i))?;
+            if i == 0 && head[0] != 0x16 {
+                anyhow::bail!("expected ServerHello (0x16), got 0x{:02x}", head[0]);
+            }
+            let record_len = u16::from_be_bytes([head[3], head[4]]) as usize;
+            if record_len > 16384 {
+                anyhow::bail!("reality handshake: record {} too large: {} bytes", i, record_len);
+            }
+            let mut _payload = vec![0u8; record_len];
+            tcp_stream.read_exact(&mut _payload).await
+                .with_context(|| format!("reality handshake: failed reading record {} payload", i))?;
+        }
+
+        let reality_stream = RealityStream::new(tcp_stream, data_key);
+        xhttp_handshake_and_loop(reality_stream, target_ip, sni, access_key, wss).await
+    } else {
+        xhttp_handshake_and_loop(tcp_stream, target_ip, sni, access_key, wss).await
+    }
+}
+
+// -----------------------------------------------------------------------
+// RealityStream: Wraps a TCP stream in fake TLS Application Data Records
+// -----------------------------------------------------------------------
+struct RealityStream {
+    inner: TcpStream,
+    data_key: ChaCha20Poly1305,
+    rx_nonce: u64,
+    tx_nonce: u64,
+    rx_buf: BytesMut,
+    plaintext_buf: BytesMut,
+    tx_buf: BytesMut,
+}
+
+impl RealityStream {
+    fn new(inner: TcpStream, data_key: ChaCha20Poly1305) -> Self {
+        Self {
+            inner,
+            data_key,
+            rx_nonce: 0,
+            tx_nonce: 0,
+            rx_buf: BytesMut::with_capacity(16384),
+            plaintext_buf: BytesMut::new(),
+            tx_buf: BytesMut::new(),
+        }
+    }
+    
+    fn make_nonce(seq: u64) -> [u8; 12] {
+        let mut nonce = [0u8; 12];
+        nonce[4..12].copy_from_slice(&seq.to_le_bytes());
+        nonce
+    }
+}
+
+impl tokio::io::AsyncRead for RealityStream {
+    fn poll_read(mut self: Pin<&mut Self>, cx: &mut TaskContext<'_>, buf: &mut tokio::io::ReadBuf<'_>) -> Poll<std::io::Result<()>> {
+        loop {
+            if !self.plaintext_buf.is_empty() {
+                let out_len = std::cmp::min(buf.remaining(), self.plaintext_buf.len());
+                buf.put_slice(&self.plaintext_buf[..out_len]);
+                self.plaintext_buf.advance(out_len);
+                return Poll::Ready(Ok(()));
+            }
+
+            if self.rx_buf.len() >= 5 {
+                let len = u16::from_be_bytes([self.rx_buf[3], self.rx_buf[4]]) as usize;
+                if self.rx_buf.len() >= 5 + len {
+                    if self.rx_buf[0] != 0x17 {
+                        return Poll::Ready(Err(std::io::Error::new(std::io::ErrorKind::InvalidData, "expected application data record")));
+                    }
+                    
+                    let ciphertext = &self.rx_buf[5..5+len];
+                    let nonce_bytes = Self::make_nonce(self.rx_nonce);
+                    let nonce = Nonce::from_slice(&nonce_bytes);
+                    
+                    match self.data_key.decrypt(nonce, ciphertext) {
+                        Ok(plaintext) => {
+                            self.rx_nonce += 1;
+                            self.plaintext_buf.put_slice(&plaintext);
+                            self.rx_buf.advance(5 + len);
+                            continue;
+                        }
+                        Err(_) => {
+                            return Poll::Ready(Err(std::io::Error::new(std::io::ErrorKind::InvalidData, "reality decrypt failed")));
+                        }
+                    }
+                }
+            }
+            
+            let mut read_buf = [0u8; 8192];
+            let mut tokio_buf = tokio::io::ReadBuf::new(&mut read_buf);
+            match Pin::new(&mut self.inner).poll_read(cx, &mut tokio_buf) {
+                Poll::Ready(Ok(())) => {
+                    if tokio_buf.filled().is_empty() {
+                        return Poll::Ready(Ok(()));
+                    }
+                    self.rx_buf.put_slice(tokio_buf.filled());
+                }
+                Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
+                Poll::Pending => return Poll::Pending,
+            }
+        }
+    }
+}
+
+impl tokio::io::AsyncWrite for RealityStream {
+    fn poll_write(self: Pin<&mut Self>, cx: &mut TaskContext<'_>, buf: &[u8]) -> Poll<std::io::Result<usize>> {
+        let this = self.get_mut();
+        while !this.tx_buf.is_empty() {
+            match Pin::new(&mut this.inner).poll_write(cx, &this.tx_buf) {
+                Poll::Ready(Ok(n)) => this.tx_buf.advance(n),
+                Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
+                Poll::Pending => return Poll::Pending,
+            }
+        }
+
+        let nonce_bytes = Self::make_nonce(this.tx_nonce);
+        let nonce = Nonce::from_slice(&nonce_bytes);
+        
+        match this.data_key.encrypt(nonce, buf) {
+            Ok(ciphertext) => {
+                this.tx_nonce += 1;
+                this.tx_buf.reserve(5 + ciphertext.len());
+                this.tx_buf.put_u8(0x17);
+                this.tx_buf.put_u16(0x0303);
+                this.tx_buf.put_u16(ciphertext.len() as u16);
+                this.tx_buf.put_slice(&ciphertext);
+                
+                match Pin::new(&mut this.inner).poll_write(cx, &this.tx_buf) {
+                    Poll::Ready(Ok(n)) => this.tx_buf.advance(n),
+                    Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
+                    Poll::Pending => {}
+                }
+                Poll::Ready(Ok(buf.len()))
+            }
+            Err(_) => Poll::Ready(Err(std::io::Error::new(std::io::ErrorKind::Other, "reality encrypt failed"))),
+        }
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, cx: &mut TaskContext<'_>) -> Poll<std::io::Result<()>> {
+        let this = self.get_mut();
+        while !this.tx_buf.is_empty() {
+            match Pin::new(&mut this.inner).poll_write(cx, &this.tx_buf) {
+                Poll::Ready(Ok(n)) => this.tx_buf.advance(n),
+                Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
+                Poll::Pending => return Poll::Pending,
+            }
+        }
+        Pin::new(&mut this.inner).poll_flush(cx)
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut TaskContext<'_>) -> Poll<std::io::Result<()>> {
+        let this = self.get_mut();
+        while !this.tx_buf.is_empty() {
+            match Pin::new(&mut this.inner).poll_write(cx, &this.tx_buf) {
+                Poll::Ready(Ok(n)) => this.tx_buf.advance(n),
+                Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
+                Poll::Pending => return Poll::Pending,
+            }
+        }
+        Pin::new(&mut this.inner).poll_shutdown(cx)
+    }
+}
+
+async fn xhttp_handshake_and_loop<S>(
+    mut stream: S,
+    target_ip: IpAddr,
+    sni: &str,
+    access_key: &[u8],
+    wss: bool,
+) -> Result<(mpsc::Sender<Bytes>, Arc<tokio::sync::Mutex<mpsc::Receiver<Bytes>>>)>
+where
+    S: tokio::io::AsyncRead + tokio::io::AsyncWrite + Unpin + Send + 'static,
+{
+    // 1. Generate auth token: [8-byte timestamp BE] ++ [HMAC-SHA256]
+    let timestamp = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH)?.as_secs();
+    let ts_bytes = timestamp.to_be_bytes();
+    use hmac::Mac;
+    let mut mac = <HmacSha256 as Mac>::new_from_slice(access_key).unwrap_or_else(|_| <HmacSha256 as Mac>::new_from_slice(b"").unwrap());
+    mac.update(&ts_bytes);
+    let mac_bytes = mac.finalize().into_bytes();
+
+    let mut sig_bytes = Vec::with_capacity(8 + mac_bytes.len());
+    sig_bytes.extend_from_slice(&ts_bytes);
+    sig_bytes.extend_from_slice(&mac_bytes);
+
+    let auth_token = base64::engine::general_purpose::STANDARD_NO_PAD.encode(&sig_bytes);
+
+    let http_host = if sni.is_empty() { target_ip.to_string() } else { sni.to_string() };
+
+    let req = if wss {
+        format!(
+            "GET /wss HTTP/1.1\r\n\
+             Host: {}\r\n\
+             Upgrade: websocket\r\n\
+             Connection: upgrade\r\n\
+             Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n\
+             Sec-WebSocket-Version: 13\r\n\
+             Authorization: Bearer {}\r\n\
+             \r\n",
+            http_host, auth_token
+        )
+    } else {
+        format!(
+            "GET /stream HTTP/1.1\r\n\
+             Host: {}\r\n\
+             Authorization: Bearer {}\r\n\
+             \r\n",
+            http_host, auth_token
+        )
+    };
+
+    stream.write_all(req.as_bytes()).await?;
+
+    // Wait for HTTP 200 OK or 101 Switching Protocols
+    let mut header_buf = Vec::new();
+    let mut temp = [0u8; 1];
+    loop {
+        let n = stream.read(&mut temp).await?;
+        if n == 0 {
+            anyhow::bail!("connection closed by server during handshake");
+        }
+        header_buf.push(temp[0]);
+        if header_buf.ends_with(b"\r\n\r\n") {
+            break;
+        }
+        if header_buf.len() > 8192 {
+            anyhow::bail!("server response too long");
+        }
+    }
+
+    let resp_str = String::from_utf8_lossy(&header_buf);
+    if wss {
+        if !resp_str.starts_with("HTTP/1.1 101 ") {
+            anyhow::bail!("failed to switch protocols: {}", resp_str.lines().next().unwrap_or(""));
+        }
+    } else {
+        if !resp_str.starts_with("HTTP/1.1 200 OK") {
+            anyhow::bail!("server rejected stream: {}", resp_str.lines().next().unwrap_or(""));
+        }
+    }
+
+    let (tx, mut rx) = mpsc::channel::<Bytes>(16384);
+    let (mut read_half, mut write_half) = tokio::io::split(stream);
+
+    let writer_task = tokio::spawn(async move {
+        while let Some(packet) = rx.recv().await {
+            if wss {
+                let header = encode_wss_frame(&packet, true);
+                if write_half.write_all(&header).await.is_err() { break; }
+            } else {
+                let mut out = BytesMut::with_capacity(2 + packet.len());
+                out.put_u16(packet.len() as u16);
+                out.put_slice(&packet);
+                if write_half.write_all(&out).await.is_err() { break; }
+            }
+        }
+    });
+
+    let (in_tx, in_rx) = mpsc::channel::<Bytes>(16384);
+    let in_rx_arc = Arc::new(tokio::sync::Mutex::new(in_rx));
+
+    let in_tx_clone = in_tx.clone();
+    let reader_task = tokio::spawn(async move {
+        if wss {
+            let mut read_buf = BytesMut::with_capacity(65536);
+            let mut tmp = [0u8; 8192];
+            loop {
+                match read_half.read(&mut tmp).await {
+                    Ok(0) => break,
+                    Ok(n) => {
+                        read_buf.put_slice(&tmp[..n]);
+                        loop {
+                            match decode_wss_frame(&mut read_buf) {
+                                WssFrameResult::Frame { payload, total_len } => {
+                                    if in_tx_clone.send(Bytes::from(payload)).await.is_err() { return; }
+                                    read_buf.advance(total_len);
+                                }
+                                WssFrameResult::Incomplete => break,
+                            }
+                        }
+                    }
+                    Err(_) => break,
+                }
+            }
+        } else {
+            let mut len_buf = [0u8; 2];
+            loop {
+                if read_half.read_exact(&mut len_buf).await.is_err() { break; }
+                let len = u16::from_be_bytes(len_buf) as usize;
+                if len > 65535 { break; }
+                let mut data = vec![0u8; len];
+                if read_half.read_exact(&mut data).await.is_err() { break; }
+                if in_tx_clone.send(Bytes::from(data)).await.is_err() { break; }
+            }
+        }
+    });
+
+    tokio::spawn(async move {
+        let _ = tokio::join!(writer_task, reader_task);
+    });
+
+    Ok((tx, in_rx_arc))
+}

ostp-client/src/tunnel/balancer.rs

@@ -0,0 +1,65 @@
+use crate::config::{ClientConfig, OutboundConfig};
+use std::collections::HashMap;
+
+pub struct Balancer {
+    outbounds: HashMap<String, OutboundConfig>,
+}
+
+impl Balancer {
+    pub fn new(config: &ClientConfig) -> Self {
+        let mut outbounds = HashMap::new();
+        for outbound in &config.outbounds {
+            let tag = match outbound {
+                OutboundConfig::Selector { tag, .. } => tag,
+                OutboundConfig::Urltest { tag, .. } => tag,
+                OutboundConfig::Ostp { tag, .. } => tag,
+                OutboundConfig::Direct { tag } => tag,
+                OutboundConfig::Socks { tag, .. } => tag,
+                OutboundConfig::Block { tag } => tag,
+            };
+            outbounds.insert(tag.clone(), outbound.clone());
+        }
+
+        Self { outbounds }
+    }
+
+    /// Resolves an outbound tag into a concrete, non-group outbound tag.
+    /// E.g. "proxy-group" -> "server-helsinki"
+    pub fn resolve_outbound(&self, tag: &str) -> String {
+        // Prevent infinite loops if groups point to groups
+        let mut current_tag = tag.to_string();
+        for _ in 0..10 {
+            if let Some(outbound) = self.outbounds.get(&current_tag) {
+                match outbound {
+                    OutboundConfig::Selector { outbounds, default, .. } => {
+                        current_tag = if let Some(def) = default {
+                            def.clone()
+                        } else {
+                            outbounds.first().cloned().unwrap_or_else(|| "direct".to_string())
+                        };
+                    }
+                    OutboundConfig::Urltest { outbounds, .. } => {
+                        // TODO: Implement background ping worker to find the fastest node.
+                        // For now, act as a fallback by taking the first available node.
+                        current_tag = outbounds.first().cloned().unwrap_or_else(|| "direct".to_string());
+                    }
+                    _ => {
+                        // It's a concrete physical outbound (ostp, direct, block)
+                        return current_tag;
+                    }
+                }
+            } else {
+                // Outbound not found, fallback to direct
+                return "direct".to_string();
+            }
+        }
+        "direct".to_string() // Max depth reached
+    }
+
+    /// Fetches the config for a concrete outbound
+    pub fn get_concrete_outbound(&self, tag: &str) -> Option<&OutboundConfig> {
+        let resolved_tag = self.resolve_outbound(tag);
+        tracing::debug!("Balancer: tag '{}' resolved to '{}'", tag, resolved_tag);
+        self.outbounds.get(&resolved_tag)
+    }
+}

ostp-client/src/tunnel/exclusion.rs

@@ -0,0 +1,134 @@
+use crate::config::ExclusionConfig;
+use std::time::Duration;
+use tokio::time::timeout;
+
+#[derive(Clone)]
+pub struct ExclusionMatcher {
+    pub domain_suffix: Vec<String>,
+    pub cidrs: Vec<Cidr>,
+    pub processes: Vec<String>,
+    pub physical_if_index: Option<u32>,
+    pub physical_if_name: Option<String>,
+}
+
+impl ExclusionMatcher {
+    pub fn new(
+        exclusions: &ExclusionConfig,
+        physical_if_index: Option<u32>,
+        physical_if_name: Option<String>,
+    ) -> Self {
+        let mut cidrs = Vec::new();
+        for ip in &exclusions.ips {
+            if let Some(cidr) = parse_cidr(ip) {
+                cidrs.push(cidr);
+            }
+        }
+
+        let processes = exclusions.processes.iter()
+            .map(|p| p.trim().to_lowercase())
+            .filter(|p| !p.is_empty())
+            .collect();
+
+        Self {
+            domain_suffix: exclusions
+                .domains
+                .iter()
+                .map(|d| d.trim().trim_start_matches('.').to_lowercase())
+                .filter(|d| !d.is_empty())
+                .collect(),
+            cidrs,
+            processes,
+            physical_if_index,
+            physical_if_name,
+        }
+    }
+
+    pub async fn should_bypass_target(&self, host: &str, port: u16, timeout_value: Duration) -> bool {
+        if self.match_domain(host) {
+            return true;
+        }
+
+        if self.cidrs.is_empty() {
+            return false;
+        }
+
+        if let Ok(ip) = host.parse::<std::net::IpAddr>() {
+            return self.match_ip(&ip);
+        }
+
+        let lookup_target = (host.to_string(), port);
+        match timeout(timeout_value, tokio::net::lookup_host(lookup_target)).await {
+            Ok(Ok(addrs)) => addrs.into_iter().any(|addr| self.match_ip(&addr.ip())),
+            _ => false,
+        }
+    }
+
+    pub fn match_domain(&self, host: &str) -> bool {
+        if self.domain_suffix.is_empty() {
+            return false;
+        }
+        let host = host.trim_end_matches('.').to_lowercase();
+        self.domain_suffix.iter().any(|suffix| {
+            host == *suffix || host.ends_with(&format!(".{suffix}"))
+        })
+    }
+
+    pub fn match_ip(&self, ip: &std::net::IpAddr) -> bool {
+        self.cidrs.iter().any(|cidr| cidr.contains(ip))
+    }
+
+    pub fn match_process(&self, process_name: &str) -> bool {
+        if self.processes.is_empty() {
+            return false;
+        }
+        let p = process_name.to_lowercase();
+        self.processes.iter().any(|ex| p.contains(ex))
+    }
+}
+
+#[derive(Clone)]
+pub enum Cidr {
+    V4(u32, u8),
+    V6(u128, u8),
+}
+
+impl Cidr {
+    pub fn contains(&self, ip: &std::net::IpAddr) -> bool {
+        match (self, ip) {
+            (Cidr::V4(net, bits), std::net::IpAddr::V4(addr)) => {
+                let mask = if *bits == 0 { 0 } else { u32::MAX << (32 - bits) };
+                let ip = u32::from_be_bytes(addr.octets());
+                (ip & mask) == (*net & mask)
+            }
+            (Cidr::V6(net, bits), std::net::IpAddr::V6(addr)) => {
+                let mask = if *bits == 0 { 0 } else { u128::MAX << (128 - bits) };
+                let ip = u128::from_be_bytes(addr.octets());
+                (ip & mask) == (*net & mask)
+            }
+            _ => false,
+        }
+    }
+}
+
+pub fn parse_cidr(s: &str) -> Option<Cidr> {
+    let parts: Vec<&str> = s.split('/').collect();
+    if parts.is_empty() || parts.len() > 2 {
+        return None;
+    }
+    if let Ok(ip) = parts[0].parse::<std::net::IpAddr>() {
+        let bits = if parts.len() == 2 {
+            parts[1].parse::<u8>().ok()?
+        } else {
+            match ip {
+                std::net::IpAddr::V4(_) => 32,
+                std::net::IpAddr::V6(_) => 128,
+            }
+        };
+        match ip {
+            std::net::IpAddr::V4(v4) => Some(Cidr::V4(u32::from_be_bytes(v4.octets()), bits)),
+            std::net::IpAddr::V6(v6) => Some(Cidr::V6(u128::from_be_bytes(v6.octets()), bits)),
+        }
+    } else {
+        None
+    }
+}

ostp-client/src/tunnel/inbounds/local_proxy.rs

@@ -0,0 +1,231 @@
+use anyhow::{anyhow, Result};
+use std::sync::Arc;
+use crate::config::{ClientConfig, InboundConfig};
+use crate::tunnel::router::{Router, Session};
+use crate::tunnel::outbounds::OutboundManager;
+use tokio::net::TcpListener;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::sync::watch;
+
+pub async fn run_socks_inbound(
+    _config: ClientConfig,
+    inbound_config: InboundConfig,
+    router: Arc<Router>,
+    outbound_manager: Arc<OutboundManager>,
+    mut shutdown: watch::Receiver<bool>,
+) -> Result<()> {
+    let InboundConfig::LocalProxy { tag, protocol, listen, port, set_system_proxy } = inbound_config else {
+        return Err(anyhow!("Invalid config for LocalProxy inbound"));
+    };
+
+    let bind_addr = format!("{}:{}", listen, port);
+    tracing::info!("Starting {} proxy inbound on {} (tag: {})", protocol, bind_addr, tag);
+
+    let _proxy_guard = if set_system_proxy {
+        let proxy_host = if listen == "0.0.0.0" { "127.0.0.1" } else { &listen };
+        Some(crate::sysproxy::SystemProxyGuard::enable(&format!("{}:{}", proxy_host, port)))
+    } else {
+        None
+    };
+
+    let listener = TcpListener::bind(&bind_addr).await?;
+
+    loop {
+        tokio::select! {
+            _ = shutdown.changed() => {
+                tracing::info!("Local proxy inbound {} shutting down", tag);
+                break;
+            }
+            accept_res = listener.accept() => {
+                if let Ok((mut stream, client_addr)) = accept_res {
+                    let rt = router.clone();
+                    let om = outbound_manager.clone();
+                    let proto = protocol.clone();
+                    let inbound_tag = tag.clone();
+
+                    tokio::spawn(async move {
+                        if proto == "socks" {
+                            if let Err(e) = handle_socks5_connection(&mut stream, &rt, &om, &inbound_tag, client_addr).await {
+                                tracing::debug!("SOCKS5 handling error: {}", e);
+                            }
+                        } else if proto == "http" {
+                            if let Err(e) = handle_http_connection(&mut stream, &rt, &om, &inbound_tag, client_addr).await {
+                                tracing::debug!("HTTP proxy handling error: {}", e);
+                            }
+                        } else {
+                            tracing::error!("Unknown local proxy protocol: {}", proto);
+                        }
+                    });
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+async fn handle_socks5_connection(
+    stream: &mut tokio::net::TcpStream,
+    router: &Arc<Router>,
+    outbound_manager: &Arc<OutboundManager>,
+    inbound_tag: &str,
+    client_addr: std::net::SocketAddr,
+) -> Result<()> {
+    let mut buf = [0u8; 256];
+    
+    // Read version and method selection
+    stream.read_exact(&mut buf[0..2]).await?;
+    if buf[0] != 0x05 {
+        return Err(anyhow!("Unsupported SOCKS version: {}", buf[0]));
+    }
+    
+    let num_methods = buf[1] as usize;
+    stream.read_exact(&mut buf[0..num_methods]).await?;
+    
+    // Reply with NO AUTHENTICATION REQUIRED (0x00)
+    stream.write_all(&[0x05, 0x00]).await?;
+    
+    // Read the actual request
+    stream.read_exact(&mut buf[0..4]).await?;
+    if buf[0] != 0x05 || buf[1] != 0x01 { // Only CONNECT is supported
+        return Err(anyhow!("Unsupported SOCKS command"));
+    }
+    
+    let atyp = buf[3];
+    let (target_host, ip_addr) = match atyp {
+        0x01 => { // IPv4
+            stream.read_exact(&mut buf[0..4]).await?;
+            let ip = std::net::Ipv4Addr::new(buf[0], buf[1], buf[2], buf[3]);
+            (ip.to_string(), Some(std::net::IpAddr::V4(ip)))
+        }
+        0x03 => { // Domain
+            stream.read_exact(&mut buf[0..1]).await?;
+            let domain_len = buf[0] as usize;
+            stream.read_exact(&mut buf[0..domain_len]).await?;
+            let domain = String::from_utf8_lossy(&buf[0..domain_len]).to_string();
+            (domain, None)
+        }
+        0x04 => { // IPv6
+            stream.read_exact(&mut buf[0..16]).await?;
+            let mut ip_bytes = [0u8; 16];
+            ip_bytes.copy_from_slice(&buf[0..16]);
+            let ip = std::net::Ipv6Addr::from(ip_bytes);
+            (ip.to_string(), Some(std::net::IpAddr::V6(ip)))
+        }
+        _ => return Err(anyhow!("Unsupported SOCKS address type: {}", atyp)),
+    };
+    
+    stream.read_exact(&mut buf[0..2]).await?;
+    let target_port = u16::from_be_bytes([buf[0], buf[1]]);
+    
+    let process_name = crate::tunnel::process_lookup::get_process_name_from_port(client_addr.port());
+
+    let session = Session {
+        protocol: "tcp".to_string(),
+        inbound_tag: inbound_tag.to_string(),
+        source_ip: Some(client_addr.ip()),
+        destination_ip: ip_addr,
+        destination_port: target_port,
+        sni: if atyp == 0x03 { Some(target_host.clone()) } else { None },
+        process_name,
+    };
+
+    let outbound_tag = router.route(&session);
+    tracing::info!("SOCKS5 TCP {} -> {}:{} routed to {}", client_addr, target_host, target_port, outbound_tag);
+
+    match outbound_manager.dial_tcp(&outbound_tag, &target_host, target_port).await {
+        Ok(mut remote_stream) => {
+            // Reply success
+            stream.write_all(&[0x05, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]).await?;
+            
+            // Forward data
+            tokio::io::copy_bidirectional(stream, &mut remote_stream).await?;
+        }
+        Err(e) => {
+            tracing::warn!("SOCKS5 TCP dial failed to {}: {}", outbound_tag, e);
+            // Reply host unreachable
+            let _ = stream.write_all(&[0x05, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]).await;
+        }
+    }
+    
+    Ok(())
+}
+
+async fn handle_http_connection(
+    stream: &mut tokio::net::TcpStream,
+    router: &Arc<Router>,
+    outbound_manager: &Arc<OutboundManager>,
+    inbound_tag: &str,
+    client_addr: std::net::SocketAddr,
+) -> Result<()> {
+    // Basic HTTP CONNECT implementation
+    let mut buf = [0u8; 4096];
+    let n = stream.read(&mut buf).await?;
+    if n == 0 { return Ok(()); }
+    
+    let request = String::from_utf8_lossy(&buf[0..n]);
+    let mut lines = request.lines();
+    let first_line = lines.next().ok_or_else(|| anyhow!("Empty HTTP request"))?;
+    
+    let parts: Vec<&str> = first_line.split_whitespace().collect();
+    if parts.len() < 3 {
+        return Err(anyhow!("Invalid HTTP request line"));
+    }
+    
+    let method = parts[0];
+    let target = parts[1]; // host:port for CONNECT, http://host:port/... for GET
+    
+    let (target_host, target_port) = if method == "CONNECT" {
+        let parts: Vec<&str> = target.split(':').collect();
+        let host = parts[0].to_string();
+        let port = parts.get(1).unwrap_or(&"443").parse::<u16>().unwrap_or(443);
+        (host, port)
+    } else {
+        // Rudimentary GET parsing, ideally use httparse
+        if target.starts_with("http://") {
+            let without_scheme = &target[7..];
+            let host_part = without_scheme.split('/').next().unwrap_or(without_scheme);
+            let parts: Vec<&str> = host_part.split(':').collect();
+            let host = parts[0].to_string();
+            let port = parts.get(1).unwrap_or(&"80").parse::<u16>().unwrap_or(80);
+            (host, port)
+        } else {
+            return Err(anyhow!("Unsupported HTTP method/target: {} {}", method, target));
+        }
+    };
+    
+    let process_name = crate::tunnel::process_lookup::get_process_name_from_port(client_addr.port());
+
+    let session = Session {
+        protocol: "tcp".to_string(),
+        inbound_tag: inbound_tag.to_string(),
+        source_ip: Some(client_addr.ip()),
+        destination_ip: None, // Could parse if IP
+        destination_port: target_port,
+        sni: Some(target_host.clone()),
+        process_name,
+    };
+
+    let outbound_tag = router.route(&session);
+    tracing::info!("HTTP TCP {} -> {}:{} routed to {}", client_addr, target_host, target_port, outbound_tag);
+
+    match outbound_manager.dial_tcp(&outbound_tag, &target_host, target_port).await {
+        Ok(mut remote_stream) => {
+            if method == "CONNECT" {
+                stream.write_all(b"HTTP/1.1 200 Connection Established\r\n\r\n").await?;
+            } else {
+                remote_stream.write_all(&buf[0..n]).await?;
+            }
+            
+            tokio::io::copy_bidirectional(stream, &mut remote_stream).await?;
+        }
+        Err(e) => {
+            tracing::warn!("HTTP TCP dial failed to {}: {}", outbound_tag, e);
+            if method == "CONNECT" {
+                let _ = stream.write_all(b"HTTP/1.1 502 Bad Gateway\r\n\r\n").await;
+            }
+        }
+    }
+    
+    Ok(())
+}

ostp-client/src/tunnel/inbounds/mod.rs

@@ -0,0 +1,2 @@
+pub mod tun;
+pub mod local_proxy;

ostp-client/src/tunnel/inbounds/tun.rs

@@ -0,0 +1,301 @@
+use anyhow::{anyhow, Result};
+use std::sync::Arc;
+use crate::config::{ClientConfig, InboundConfig};
+#[allow(unused_imports)]
+use crate::tunnel::router::{Router, Session};
+use crate::tunnel::outbounds::OutboundManager;
+use tokio::sync::watch;
+
+#[cfg(any(target_os = "windows", target_os = "linux"))]
+pub async fn run_tun_inbound(
+    config: ClientConfig,
+    inbound_config: InboundConfig,
+    router: Arc<Router>,
+    outbound_manager: Arc<OutboundManager>,
+    mut shutdown: watch::Receiver<bool>,
+) -> Result<()> {
+    
+    use netstack_smoltcp::StackBuilder;
+    use tokio::io::{AsyncReadExt, AsyncWriteExt};
+    use futures::{StreamExt, SinkExt};
+
+    let InboundConfig::Tun { tag, auto_route, mtu, .. } = inbound_config else {
+        return Err(anyhow!("Invalid config for TUN inbound"));
+    };
+
+    tracing::info!("Starting TUN inbound (tag: {}, auto_route: {}, mtu: {})", tag, auto_route, mtu);
+
+    #[cfg(target_os = "windows")]
+    let _phys_if_for_bypass: Option<u32> = ostp_tun::windows::windows_route::sys::get_default_ipv4_route().map(|(_, idx)| idx);
+    #[cfg(not(target_os = "windows"))]
+    let _phys_if_for_bypass: Option<u32> = None;
+
+    let mut bypass_ips: Vec<std::net::IpAddr> = Vec::new();
+    
+    // Bypass all outbound server IPs
+    for outbound in &config.outbounds {
+        let server = match outbound {
+            crate::config::OutboundConfig::Ostp { server, .. } => Some(server),
+            crate::config::OutboundConfig::Socks { server, .. } => Some(server),
+            _ => None,
+        };
+        if let Some(host) = server {
+            if let Ok(ip) = host.parse::<std::net::IpAddr>() {
+                bypass_ips.push(ip);
+            } else {
+                if let Ok(addrs) = tokio::net::lookup_host((host.as_str(), 443)).await {
+                    for addr in addrs {
+                        bypass_ips.push(addr.ip());
+                    }
+                }
+            }
+        }
+    }
+
+    // Build smoltcp network stack with proper buffer sizes for throughput
+    let (stack, tcp_runner, udp_socket, tcp_listener) = StackBuilder::default()
+        .stack_buffer_size(65536)   // 64KB for packet accumulation
+        .tcp_buffer_size(131072)    // 128KB for TCP streams
+        .udp_buffer_size(65536)     // 64KB for UDP datagrams
+        .enable_tcp(true)
+        .enable_udp(true)
+        .mtu(mtu)
+        .build()?;
+
+    let mut runner_task = tokio::spawn(async move {
+        if let Some(runner) = tcp_runner {
+            let _ = runner.await;
+        }
+    });
+
+    let (mut stack_sink, mut stack_stream) = stack.split();
+
+    #[allow(unused_variables)]
+    let mut _route_guard = None;
+
+    let (tun_to_stack, stack_to_tun) = {
+        #[cfg(target_os = "android")]
+        {
+            if let Some(fd) = fd {
+                use std::os::fd::{FromRawFd, AsRawFd};
+                use tokio::io::unix::AsyncFd;
+                use std::os::unix::io::OwnedFd;
+                
+                let async_fd = AsyncFd::new(unsafe { OwnedFd::from_raw_fd(fd) })?;
+                let async_fd_shared = std::sync::Arc::new(async_fd);
+                
+                let afd1 = async_fd_shared.clone();
+                let tun_to_stack = tokio::spawn(async move {
+                    let mut frame = vec![0u8; 65535];
+                    loop {
+                        let mut guard = match afd1.readable().await {
+                            Ok(g) => g,
+                            Err(_) => break,
+                        };
+                        match guard.try_io(|inner| {
+                            let res = unsafe { libc::read(inner.as_raw_fd(), frame.as_mut_ptr() as *mut libc::c_void, frame.len()) };
+                            if res < 0 {
+                                let err = std::io::Error::last_os_error();
+                                if err.kind() == std::io::ErrorKind::WouldBlock { Err(err) } else { Ok(res as isize) }
+                            } else { Ok(res as isize) }
+                        }) {
+                            Ok(Ok(n)) if n > 0 => {
+                                if let Err(_) = stack_sink.send(frame[..n as usize].to_vec()).await { break; }
+                            }
+                            Ok(Ok(_)) => break,
+                            Ok(Err(_)) => break,
+                            Err(_) => continue,
+                        }
+                    }
+                });
+
+                let afd2 = async_fd_shared.clone();
+                let stack_to_tun = tokio::spawn(async move {
+                    while let Some(Ok(frame)) = stack_stream.next().await {
+                        let mut written = 0;
+                        while written < frame.len() {
+                            let mut guard = match afd2.writable().await {
+                                Ok(g) => g,
+                                Err(_) => break,
+                            };
+                            match guard.try_io(|inner| {
+                                let res = unsafe { libc::write(inner.as_raw_fd(), frame[written..].as_ptr() as *const libc::c_void, frame.len() - written) };
+                                if res < 0 {
+                                    let err = std::io::Error::last_os_error();
+                                    if err.kind() == std::io::ErrorKind::WouldBlock { Err(err) } else { Ok(res as isize) }
+                                } else { Ok(res as isize) }
+                            }) {
+                                Ok(Ok(n)) if n > 0 => written += n as usize,
+                                Ok(Ok(_)) => break,
+                                Ok(Err(_)) => break,
+                                Err(_) => continue,
+                            }
+                        }
+                    }
+                });
+                (tun_to_stack, stack_to_tun)
+            } else {
+                return Err(anyhow!("FD is required on Android but not provided"));
+            }
+        }
+
+        #[cfg(not(target_os = "android"))]
+        {
+            let opts = ostp_tun::OstpTunOptions {
+                server_ip: bypass_ips.first().copied().unwrap_or_else(|| "127.0.0.1".parse().unwrap()),
+                bypass_ips: bypass_ips,
+                dns_server: None,
+                kill_switch: false,
+                mtu: mtu as u16,
+                wintun_path: None,
+            };
+
+            let tun_interface = ostp_tun::OstpTunInterface::create(opts)
+                .await
+                .map_err(|e| anyhow!("Failed to create OstpTunInterface: {}", e))?;
+                
+            let dev = tun_interface.device;
+            _route_guard = Some(tun_interface.guard);
+
+            let (mut tun_read, mut tun_write) = tokio::io::split(dev);
+            let tun_to_stack = tokio::spawn(async move {
+                let mut buf = vec![0u8; 65536];
+                loop {
+                    match tun_read.read(&mut buf).await {
+                        Ok(0) => break,
+                        Ok(n) => {
+                            if let Err(_) = stack_sink.send(buf[..n].to_vec()).await { break; }
+                        }
+                        Err(e) => tracing::debug!("tun_read error: {e}"),
+                    }
+                }
+            });
+            let stack_to_tun = tokio::spawn(async move {
+                while let Some(Ok(frame)) = stack_stream.next().await {
+                    if let Err(e) = tun_write.write(&frame).await { tracing::debug!("tun_write error: {e}"); }
+                }
+            });
+            (tun_to_stack, stack_to_tun)
+        }
+    };
+
+    // ── TCP Handler ──
+    let outbound_manager_tcp = outbound_manager.clone();
+    let router_tcp = router.clone();
+    let tag_tcp = tag.clone();
+    
+    let tcp_accept_task = tokio::spawn(async move {
+        let Some(mut listener) = tcp_listener else { return; };
+        while let Some((mut stream, local, remote)) = listener.next().await {
+            let om = outbound_manager_tcp.clone();
+            let rt = router_tcp.clone();
+            let ib_tag = tag_tcp.clone();
+            
+            tokio::spawn(async move {
+                let process_name = crate::tunnel::process_lookup::get_process_name_from_port(local.port());
+
+                let mut sniff_buf = [0u8; 2048];
+                let sniff_len = match tokio::time::timeout(
+                    std::time::Duration::from_millis(100),
+                    stream.read(&mut sniff_buf)
+                ).await {
+                    Ok(Ok(n)) => n,
+                    _ => 0,
+                };
+                
+                let mut domain_suffix = None;
+                if sniff_len > 0 {
+                    domain_suffix = crate::tunnel::sni_sniff::extract_sni(&sniff_buf[..sniff_len]);
+                }
+
+                let session = Session {
+                    protocol: "tcp".to_string(),
+                    inbound_tag: ib_tag.clone(),
+                    source_ip: Some(local.ip()),
+                    destination_ip: Some(remote.ip()),
+                    destination_port: remote.port(),
+                    sni: domain_suffix.map(|s| s.to_string()),
+                    process_name,
+                };
+
+                let outbound_tag = rt.route(&session);
+                tracing::info!("TUN TCP {} -> {} routed to {}", local, remote, outbound_tag);
+
+                let target_host = if let Some(domain) = session.sni {
+                    domain
+                } else {
+                    remote.ip().to_string()
+                };
+
+                match om.dial_tcp(&outbound_tag, &target_host, session.destination_port).await {
+                    Ok(mut remote_stream) => {
+                        if sniff_len > 0 {
+                            if let Err(e) = remote_stream.write_all(&sniff_buf[..sniff_len]).await {
+                                tracing::warn!("Failed to forward sniffed bytes to {}: {}", outbound_tag, e);
+                                return;
+                            }
+                        }
+                        let _ = tokio::io::copy_bidirectional(&mut stream, &mut remote_stream).await;
+                    }
+                    Err(e) => {
+                        tracing::warn!("TUN TCP dial failed to {}: {}", outbound_tag, e);
+                    }
+                }
+            });
+        }
+    });
+
+    // ── UDP Handler ──
+    let outbound_manager_udp = outbound_manager.clone();
+    let router_udp = router.clone();
+    let tag_udp = tag.clone();
+    
+    let udp_proxy_task = tokio::spawn(async move {
+        if let Some(udp_sock) = udp_socket {
+            let (mut udp_rx, _udp_tx) = udp_sock.split();
+            while let Some((payload, local, remote)) = udp_rx.next().await {
+                let process_name = crate::tunnel::process_lookup::get_process_name_from_port_udp(local.port());
+                let session = Session {
+                    protocol: "udp".to_string(),
+                    inbound_tag: tag_udp.clone(),
+                    source_ip: Some(local.ip()),
+                    destination_ip: Some(remote.ip()),
+                    destination_port: remote.port(),
+                    sni: None,
+                    process_name,
+                };
+                let outbound_tag = router_udp.route(&session);
+                
+                let payload_bytes = bytes::Bytes::copy_from_slice(&payload);
+                if let Err(e) = outbound_manager_udp.handle_udp(&outbound_tag, local, remote, payload_bytes).await {
+                    tracing::debug!("TUN UDP drop to {}: {}", outbound_tag, e);
+                }
+            }
+        }
+    });
+
+    tokio::select! {
+        _ = shutdown.changed() => {
+            tracing::info!("TUN inbound {} shutting down", tag);
+        }
+        _ = &mut runner_task => {}
+    }
+    
+    tun_to_stack.abort();
+    stack_to_tun.abort();
+    tcp_accept_task.abort();
+    udp_proxy_task.abort();
+
+    Ok(())
+}
+
+#[cfg(not(any(target_os = "windows", target_os = "linux")))]
+pub async fn run_tun_inbound(
+    _config: ClientConfig,
+    _inbound_config: InboundConfig,
+    _router: Arc<Router>,
+    _outbound_manager: Arc<OutboundManager>,
+    _shutdown: watch::Receiver<bool>,
+) -> Result<()> {
+    Err(anyhow!("TUN is only supported on Windows and Linux"))
+}

ostp-client/src/tunnel/mod.rs

@@ -1,69 +1,7 @@
-mod proxy;
-mod wintun_downloader;
-mod wintun_handler;
-
-pub use wintun_downloader::download_wintun_dll;
-pub use wintun_downloader::download_tun2socks;
-pub use wintun_handler::run_wintun_tunnel;
-
-use tokio::sync::{mpsc, watch};
-
-use crate::config::{ExclusionConfig, LocalProxyConfig, OstpConfig};
-
-pub use proxy::run_local_socks5_proxy;
-
-#[derive(Debug)]
-pub enum ProxyEvent {
-    NewStream {
-        stream_id: u16,
-        target: String,
-    },
-    Data {
-        stream_id: u16,
-        payload: bytes::Bytes,
-    },
-    Close {
-        stream_id: u16,
-    },
-}
-
-#[derive(Debug)]
-pub enum ProxyToClientMsg {
-    ConnectOk,
-    Data(bytes::Bytes),
-    Close,
-    Error(String),
-}
-
-#[allow(dead_code)]
-pub struct TunnelConfig {
-    pub local_bind: String,
-    pub remote_addr: String,
-}
-
-impl Default for TunnelConfig {
-    fn default() -> Self {
-        Self {
-            local_bind: "127.0.0.1:1080".to_string(),
-            remote_addr: "127.0.0.1:443".to_string(),
-        }
-    }
-}
-
-pub async fn cleanup() -> anyhow::Result<()> {
-    Ok(())
-}
-
-pub async fn run_local_proxy(
-    cfg: LocalProxyConfig,
-    ostp: OstpConfig,
-    exclusions: ExclusionConfig,
-    debug: bool,
-    shutdown: watch::Receiver<bool>,
-    proxy_events_tx: mpsc::Sender<ProxyEvent>,
-    client_msgs_rx: mpsc::Receiver<(u16, ProxyToClientMsg)>,
-) -> anyhow::Result<()> {
-    run_local_socks5_proxy(cfg, ostp, exclusions, debug, shutdown, proxy_events_tx, client_msgs_rx).await
-}
-
+pub mod router;
+pub mod balancer;
+pub mod outbounds;
+pub mod inbounds;
 
+pub mod process_lookup;
+pub mod sni_sniff;

ostp-client/src/tunnel/outbounds/block.rs

@@ -0,0 +1,14 @@
+use anyhow::{anyhow, Result};
+use tokio::net::TcpStream;
+
+pub async fn dial_tcp(_target_host: &str, _target_port: u16) -> Result<TcpStream> {
+    Err(anyhow!("Connection blocked by routing rule"))
+}
+
+pub async fn handle_udp(
+    _client_src: std::net::SocketAddr,
+    _target_dst: std::net::SocketAddr,
+    _payload: bytes::Bytes,
+) -> Result<()> {
+    Err(anyhow!("Connection blocked by routing rule"))
+}

ostp-client/src/tunnel/outbounds/direct.rs

@@ -0,0 +1,99 @@
+use anyhow::{anyhow, Result};
+use tokio::net::TcpStream;
+
+#[cfg(target_os = "windows")]
+pub fn bind_socket_to_interface(socket: &tokio::net::TcpSocket, is_ipv6: bool, if_index: u32) -> std::io::Result<()> {
+    use std::os::windows::io::AsRawSocket;
+    use winapi::shared::ws2def::{IPPROTO_IP, IPPROTO_IPV6};
+    
+    // These constants are defined as 31 in the Windows SDK.
+    const IP_UNICAST_IF: i32 = 31;
+    const IPV6_UNICAST_IF: i32 = 31;
+
+    let fd = socket.as_raw_socket() as usize;
+    let idx_net = if_index.to_be();
+
+    let (level, optname) = if is_ipv6 {
+        (IPPROTO_IPV6 as i32, IPV6_UNICAST_IF)
+    } else {
+        (IPPROTO_IP as i32, IP_UNICAST_IF)
+    };
+
+    let ret = unsafe {
+        winapi::um::winsock2::setsockopt(
+            fd,
+            level as i32,
+            optname as i32,
+            &idx_net as *const _ as *const i8,
+            std::mem::size_of_val(&idx_net) as i32,
+        )
+    };
+
+    if ret != 0 {
+        return Err(std::io::Error::last_os_error());
+    }
+    Ok(())
+}
+
+#[cfg(target_os = "linux")]
+pub fn bind_socket_to_interface(socket: &tokio::net::TcpSocket, _is_ipv6: bool, if_name: &str) -> std::io::Result<()> {
+    use std::os::unix::io::AsRawFd;
+    let fd = socket.as_raw_fd();
+    let name_bytes = if_name.as_bytes();
+    let ret = unsafe {
+        libc::setsockopt(
+            fd,
+            libc::SOL_SOCKET,
+            libc::SO_BINDTODEVICE,
+            name_bytes.as_ptr() as *const libc::c_void,
+            name_bytes.len() as libc::socklen_t,
+        )
+    };
+    if ret != 0 {
+        return Err(std::io::Error::last_os_error());
+    }
+    Ok(())
+}
+
+#[cfg(target_os = "macos")]
+pub fn bind_socket_to_interface(socket: &tokio::net::TcpSocket, _is_ipv6: bool, if_index: u32) -> std::io::Result<()> {
+    // macOS uses IP_BOUND_IF for IPv4 and IPV6_BOUND_IF for IPv6, similar to Windows
+    use std::os::unix::io::AsRawFd;
+    let fd = socket.as_raw_fd();
+    
+    // We can implement this later, for now just a stub so compilation works
+    tracing::debug!("macOS socket binding not yet fully implemented for interface {}", if_index);
+    Ok(())
+}
+
+pub async fn dial_tcp(target_host: &str, target_port: u16, _phys_if_idx: Option<u32>) -> Result<TcpStream> {
+    let addrs = tokio::net::lookup_host((target_host, target_port)).await?.collect::<Vec<_>>();
+    if addrs.is_empty() {
+        return Err(anyhow!("Could not resolve target host: {}", target_host));
+    }
+
+    let target_addr = addrs[0];
+    let socket = match target_addr {
+        std::net::SocketAddr::V4(_) => tokio::net::TcpSocket::new_v4()?,
+        std::net::SocketAddr::V6(_) => tokio::net::TcpSocket::new_v6()?,
+    };
+
+    #[cfg(target_os = "windows")]
+    if let Some(idx) = _phys_if_idx {
+        if let Err(e) = bind_socket_to_interface(&socket, target_addr.is_ipv6(), idx) {
+            tracing::warn!("DIRECT: Failed to bind to physical interface {}: {}", idx, e);
+        }
+    }
+
+    let stream = tokio::time::timeout(std::time::Duration::from_secs(10), socket.connect(target_addr)).await??;
+    Ok(stream)
+}
+
+pub async fn handle_udp(
+    _client_src: std::net::SocketAddr,
+    _target_dst: std::net::SocketAddr,
+    _payload: bytes::Bytes,
+    _phys_if_idx: Option<u32>,
+) -> Result<()> {
+    Err(anyhow!("Direct UDP is not yet fully implemented"))
+}

ostp-client/src/tunnel/outbounds/mod.rs

@@ -0,0 +1,77 @@
+use anyhow::{anyhow, Result};
+use std::sync::Arc;
+use crate::tunnel::balancer::Balancer;
+use crate::config::OutboundConfig;
+
+pub mod direct;
+pub mod block;
+pub mod ostp;
+pub mod socks;
+
+pub struct OutboundManager {
+    balancer: Arc<Balancer>,
+    phys_if_index: Option<u32>,
+    _phys_if_name: Option<String>,
+}
+
+impl OutboundManager {
+    pub fn new(
+        balancer: Arc<Balancer>,
+        phys_if_index: Option<u32>,
+        phys_if_name: Option<String>,
+    ) -> Self {
+        Self {
+            balancer,
+            phys_if_index,
+            _phys_if_name: phys_if_name,
+        }
+    }
+
+    pub async fn dial_tcp(&self, tag: &str, target_host: &str, target_port: u16) -> Result<tokio::net::TcpStream> {
+        let concrete_config = self.balancer.get_concrete_outbound(tag)
+            .ok_or_else(|| anyhow!("Outbound tag '{}' not found or resolved to invalid node", tag))?;
+
+        match concrete_config {
+            OutboundConfig::Direct { .. } => {
+                direct::dial_tcp(target_host, target_port, self.phys_if_index).await
+            }
+            OutboundConfig::Block { .. } => {
+                block::dial_tcp(target_host, target_port).await
+            }
+            OutboundConfig::Ostp { server, port, access_key, transport, multiplex, .. } => {
+                ostp::dial_tcp(target_host, target_port, server, *port, access_key, transport, multiplex).await
+            }
+            OutboundConfig::Socks { server, port, .. } => {
+                socks::dial_tcp(target_host, target_port, server, *port).await
+            }
+            _ => Err(anyhow!("Invalid concrete outbound type for {}", tag)),
+        }
+    }
+
+    pub async fn handle_udp(
+        &self,
+        tag: &str,
+        client_src: std::net::SocketAddr,
+        target_dst: std::net::SocketAddr,
+        payload: bytes::Bytes,
+    ) -> Result<()> {
+        let concrete_config = self.balancer.get_concrete_outbound(tag)
+            .ok_or_else(|| anyhow!("Outbound tag '{}' not found or resolved to invalid node", tag))?;
+
+        match concrete_config {
+            OutboundConfig::Direct { .. } => {
+                direct::handle_udp(client_src, target_dst, payload, self.phys_if_index).await
+            }
+            OutboundConfig::Block { .. } => {
+                block::handle_udp(client_src, target_dst, payload).await
+            }
+            OutboundConfig::Ostp { server, port, access_key, transport, multiplex, .. } => {
+                ostp::handle_udp(client_src, target_dst, payload, server, *port, access_key, transport, multiplex).await
+            }
+            OutboundConfig::Socks { server, port, .. } => {
+                socks::handle_udp(client_src, target_dst, payload, server, *port).await
+            }
+            _ => Err(anyhow!("Invalid concrete outbound type for {}", tag)),
+        }
+    }
+}

ostp-client/src/tunnel/outbounds/ostp.rs

@@ -0,0 +1,391 @@
+use anyhow::Result;
+use tokio::net::TcpStream;
+use crate::config::{TransportConfig, MultiplexConfig};
+
+use ostp_core::{OstpEvent, ProtocolAction, ProtocolConfig, ProtocolMachine};
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+
+/// Build the handshake payload the server expects:
+/// [timestamp_u64_be (8 bytes)] [session_id_u32_be (4 bytes)] [access_key bytes]
+fn build_handshake_payload(session_id: u32, access_key: &str) -> Vec<u8> {
+    let ts = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs();
+    let mut payload = Vec::with_capacity(12 + access_key.len());
+    payload.extend_from_slice(&ts.to_be_bytes());
+    payload.extend_from_slice(&session_id.to_be_bytes());
+    payload.extend_from_slice(access_key.as_bytes());
+    payload
+}
+
+/// Build a correctly configured ProtocolConfig for an outgoing OSTP connection.
+fn make_initiator_config(
+    session_id: u32,
+    access_key: &str,
+    transport_cfg: &TransportConfig,
+) -> ProtocolConfig {
+    let secrets = ostp_core::crypto::derive_all_secrets(access_key.as_bytes());
+    let payload = build_handshake_payload(session_id, access_key);
+    
+    let mtu = match transport_cfg.r#type.as_str() {
+        "dns" => 1100,
+        _ => 1350,
+    };
+
+    ProtocolConfig {
+        role: ostp_core::NoiseRole::Initiator,
+        psk: secrets.psk,
+        session_id,
+        handshake_payload: payload,
+        max_padding: 256,
+        padding_strategy: ostp_core::framing::PaddingStrategy::Adaptive,
+        obfuscation_key: secrets.obfuscation_key,
+        max_reorder: 16384,
+        max_reorder_buffer: 8192,
+        ack_delay_ms: 5,
+        rto_ms: 100,
+        max_retries: 8,
+        max_sent_history: 32768,
+        handshake_pad_min: secrets.handshake_pad_min,
+        handshake_pad_max: secrets.handshake_pad_max,
+        mtu,
+    }
+}
+
+fn random_session_id() -> u32 {
+    use std::collections::hash_map::DefaultHasher;
+    use std::hash::{Hash, Hasher};
+    let mut h = DefaultHasher::new();
+    std::time::Instant::now().hash(&mut h);
+    std::thread::current().id().hash(&mut h);
+    h.finish() as u32
+}
+
+pub async fn dial_tcp(
+    target_host: &str,
+    target_port: u16,
+    server: &str,
+    port: u16,
+    access_key: &str,
+    transport_cfg: &TransportConfig,
+    _multiplex: &MultiplexConfig,
+) -> Result<TcpStream> {
+    tracing::info!("Dialing OSTP server {}:{} for target {}:{}", server, port, target_host, target_port);
+    let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await?;
+    let local_addr = listener.local_addr()?;
+    let client_stream = tokio::net::TcpStream::connect(local_addr).await?;
+    let (mut server_stream, _) = listener.accept().await?;
+
+    let transport = make_transport(transport_cfg, server, port).await?;
+
+    let session_id = random_session_id();
+    let config = make_initiator_config(session_id, access_key, transport_cfg);
+    let mut machine = ProtocolMachine::new(config).unwrap();
+
+    let target_host_str = target_host.to_string();
+
+        let server_str = server.to_string();
+        
+        // Spawn bridge task
+        tokio::spawn(async move {
+            // Send initial handshake
+            if let Ok(action) = machine.on_event(OstpEvent::Start) {
+                handle_action(action, &transport, &mut server_stream).await;
+            }
+    
+            // Wait for handshake response (server sends HandshakePayload back)
+            let mut buf = [0u8; 8192];
+            let mut handshake_success = false;
+            match tokio::time::timeout(
+                std::time::Duration::from_millis(15000),
+                transport.recv(&mut buf),
+            ).await {
+                Ok(Ok(n)) => {
+                    if let Ok(action) = machine.on_event(OstpEvent::Inbound(bytes::Bytes::copy_from_slice(&buf[..n]))) {
+                        handle_action(action, &transport, &mut server_stream).await;
+                        handshake_success = true;
+                    }
+                }
+                _ => {
+                    tracing::warn!("OSTP handshake timeout for {}:{}", server_str, port);
+                    return;
+                }
+            }
+
+        if !handshake_success {
+            tracing::warn!("TCP handshake failed or protocol machine error");
+            return;
+        }
+
+        // Send connection request
+        let connect_msg = ostp_core::relay::RelayMessage::Connect(format!("{}:{}", target_host_str, target_port));
+        let connect_encoded = connect_msg.encode();
+        if let Ok(action) = machine.on_event(OstpEvent::Outbound(1, bytes::Bytes::from(connect_encoded))) {
+            handle_action(action, &transport, &mut server_stream).await;
+        }
+
+        // ── Wait for ConnectOk before forwarding any data ─────────────────
+        // This is critical: if we enter the data loop immediately, the TLS
+        // ClientHello arrives at the server before it has established the
+        // outbound TCP connection, causing it to drop the packet as
+        // "Relay DATA for unknown stream".
+        // The kernel will buffer incoming data from server_stream while we wait.
+        let mut connect_ok = false;
+        match tokio::time::timeout(
+            std::time::Duration::from_secs(30),
+            async {
+                let mut wait_buf = [0u8; 8192];
+                loop {
+                    tokio::select! {
+                        Ok(n) = transport.recv(&mut wait_buf) => {
+                            if let Ok(action) = machine.on_event(OstpEvent::Inbound(
+                                bytes::Bytes::copy_from_slice(&wait_buf[..n]),
+                            )) {
+                                // Check for ConnectOk or Error before dispatching
+                                let result = check_connect_result(&action);
+                                handle_action(action, &transport, &mut server_stream).await;
+                                match result {
+                                    Some(true) => return true,
+                                    Some(false) => return false,
+                                    None => {}
+                                }
+                            }
+                        }
+                        _ = tokio::time::sleep(std::time::Duration::from_millis(10)) => {
+                            if let Ok(action) = machine.on_event(OstpEvent::Tick) {
+                                handle_action(action, &transport, &mut server_stream).await;
+                            }
+                        }
+                    }
+                }
+            },
+        )
+        .await
+        {
+            Ok(true) => {
+                tracing::debug!("ConnectOk received for {}:{}, starting data forwarding", target_host_str, target_port);
+                connect_ok = true;
+            }
+            Ok(false) => {
+                tracing::warn!("Server refused connection to {}:{}", target_host_str, target_port);
+            }
+            Err(_) => {
+                tracing::warn!("ConnectOk timeout for {}:{}", target_host_str, target_port);
+            }
+        }
+
+        if !connect_ok {
+            return;
+        }
+
+        // ── Main bidirectional data forwarding loop ───────────────────────
+        let mut buf = [0u8; 65535];
+        let mut udp_buf = [0u8; 65535];
+
+        loop {
+            tokio::select! {
+                Ok(n) = server_stream.read(&mut buf) => {
+                    if n == 0 { break; }
+                    let data_msg = ostp_core::relay::RelayMessage::Data(buf[..n].to_vec());
+                    let encoded = data_msg.encode();
+                    if let Ok(action) = machine.on_event(OstpEvent::Outbound(1, bytes::Bytes::from(encoded))) {
+                        handle_action(action, &transport, &mut server_stream).await;
+                    }
+                }
+                Ok(n) = transport.recv(&mut udp_buf) => {
+                    if let Ok(action) = machine.on_event(OstpEvent::Inbound(bytes::Bytes::copy_from_slice(&udp_buf[..n]))) {
+                        handle_action(action, &transport, &mut server_stream).await;
+                    }
+                }
+                _ = tokio::time::sleep(std::time::Duration::from_millis(10)) => {
+                    if let Ok(action) = machine.on_event(OstpEvent::Tick) {
+                        handle_action(action, &transport, &mut server_stream).await;
+                    }
+                }
+            }
+        }
+    });
+
+
+    Ok(client_stream)
+}
+
+pub async fn handle_udp(
+    client_src: std::net::SocketAddr,
+    target_dst: std::net::SocketAddr,
+    payload: bytes::Bytes,
+    server: &str,
+    port: u16,
+    access_key: &str,
+    transport_cfg: &TransportConfig,
+    _multiplex: &MultiplexConfig,
+) -> Result<()> {
+    let transport = make_transport(transport_cfg, server, port).await?;
+
+    // Derive session_id from client source addr for stable per-flow sessions
+    let ip_bytes = match client_src.ip() {
+        std::net::IpAddr::V4(v4) => {
+            let o = v4.octets();
+            u32::from_be_bytes(o)
+        }
+        std::net::IpAddr::V6(v6) => {
+            let o = v6.octets();
+            u32::from_be_bytes([o[12], o[13], o[14], o[15]])
+        }
+    };
+    let session_id = ip_bytes ^ (client_src.port() as u32);
+
+    let config = make_initiator_config(session_id, access_key, transport_cfg);
+    let mut machine = ProtocolMachine::new(config)?;
+
+    // Send handshake first
+    if let Ok(action) = machine.on_event(OstpEvent::Start) {
+        handle_udp_action(action, &transport).await;
+    }
+
+    // Wait for handshake response (server sends HandshakePayload back)
+    let mut buf = [0u8; 8192];
+    match tokio::time::timeout(
+        std::time::Duration::from_millis(15000),
+        transport.recv(&mut buf),
+    ).await {
+        Ok(Ok(n)) => {
+            let _ = machine.on_event(OstpEvent::Inbound(bytes::Bytes::copy_from_slice(&buf[..n])));
+        }
+        _ => {
+            tracing::warn!("OSTP handshake timeout for {}:{}", server, port);
+            return Ok(());
+        }
+    }
+
+    // Send relay UdpAssociate + data
+    let assoc_msg = ostp_core::relay::RelayMessage::UdpAssociate;
+    let encoded = assoc_msg.encode();
+    if let Ok(action) = machine.on_event(OstpEvent::Outbound(1, bytes::Bytes::from(encoded))) {
+        handle_udp_action(action, &transport).await;
+    }
+
+    let data_msg = ostp_core::relay::RelayMessage::UdpData(
+        format!("{}:{}", target_dst.ip(), target_dst.port()),
+        payload.to_vec()
+    );
+    let encoded = data_msg.encode();
+    if let Ok(action) = machine.on_event(OstpEvent::Outbound(1, bytes::Bytes::from(encoded))) {
+        handle_udp_action(action, &transport).await;
+    }
+
+    // Keep-alive for a short time to receive response
+    for _ in 0..5 {
+        match tokio::time::timeout(
+            std::time::Duration::from_millis(100),
+            transport.recv(&mut buf),
+        ).await {
+            Ok(Ok(n)) => {
+                if let Ok(action) = machine.on_event(OstpEvent::Inbound(bytes::Bytes::copy_from_slice(&buf[..n]))) {
+                    // Just process incoming UDP response internally
+                    let _ = action;
+                }
+            }
+            _ => break,
+        }
+    }
+
+    Ok(())
+}
+
+async fn make_transport(
+    transport_cfg: &TransportConfig,
+    server: &str,
+    port: u16,
+) -> Result<crate::transport::Transport> {
+    match transport_cfg.r#type.as_str() {
+        "dns" => {
+            let domain = transport_cfg.domain.clone()
+                .unwrap_or_else(|| "tunnel.example.com".to_string());
+            let resolver = transport_cfg.resolver.clone()
+                .unwrap_or_else(|| server.to_string());
+            let transport = crate::transport::dns::start_dns_transport(domain, resolver, transport_cfg.pubkey.clone()).await
+                .map_err(|e| anyhow::anyhow!(e))?;
+            Ok(transport)
+        }
+        _ => {
+            let udp = tokio::net::UdpSocket::bind("0.0.0.0:0").await?;
+            udp.connect((server, port)).await?;
+            Ok(crate::transport::Transport::Udp(std::sync::Arc::new(udp)))
+        }
+    }
+}
+
+async fn handle_udp_action(action: ProtocolAction, transport: &crate::transport::Transport) {
+    match action {
+        ProtocolAction::SendDatagram(data) => {
+            let _ = transport.send(&data).await;
+        }
+        ProtocolAction::Multiple(actions) => {
+            for a in actions {
+                if let ProtocolAction::SendDatagram(data) = a {
+                    let _ = transport.send(&data).await;
+                }
+            }
+        }
+        _ => {}
+    }
+}
+
+async fn handle_action(action: ProtocolAction, transport: &crate::transport::Transport, server_stream: &mut tokio::net::TcpStream) {
+    match action {
+        ProtocolAction::SendDatagram(data) => {
+            let _ = transport.send(&data).await;
+        }
+        ProtocolAction::DeliverApp(_stream_id, payload) => {
+            if let Ok(msg) = ostp_core::relay::RelayMessage::decode(&payload) {
+                match msg {
+                    ostp_core::relay::RelayMessage::Data(data) => {
+                        let _ = server_stream.write_all(&data).await;
+                    }
+                    ostp_core::relay::RelayMessage::ConnectOk => {
+                        tracing::debug!("TCP Connection established successfully");
+                    }
+                    ostp_core::relay::RelayMessage::Error(err) => {
+                        tracing::warn!("Server returned TCP connection error: {}", err);
+                    }
+                    _ => {}
+                }
+            }
+        }
+        ProtocolAction::Multiple(actions) => {
+            for a in actions {
+                Box::pin(handle_action(a, transport, server_stream)).await;
+            }
+        }
+        _ => {}
+    }
+}
+
+/// Inspect a ProtocolAction for ConnectOk / Error relay messages.
+/// Returns Some(true) on ConnectOk, Some(false) on Error, None if neither.
+/// Works recursively through Multiple actions.
+fn check_connect_result(action: &ProtocolAction) -> Option<bool> {
+    match action {
+        ProtocolAction::DeliverApp(_stream_id, payload) => {
+            if let Ok(msg) = ostp_core::relay::RelayMessage::decode(payload) {
+                match msg {
+                    ostp_core::relay::RelayMessage::ConnectOk => return Some(true),
+                    ostp_core::relay::RelayMessage::Error(_) => return Some(false),
+                    _ => {}
+                }
+            }
+            None
+        }
+        ProtocolAction::Multiple(actions) => {
+            for a in actions {
+                if let Some(result) = check_connect_result(a) {
+                    return Some(result);
+                }
+            }
+            None
+        }
+        _ => None,
+    }
+}

ostp-client/src/tunnel/outbounds/socks.rs

@@ -0,0 +1,17 @@
+use anyhow::{anyhow, Result};
+use tokio::net::TcpStream;
+
+pub async fn dial_tcp(_target_host: &str, _target_port: u16, _server: &str, _port: u16) -> Result<TcpStream> {
+    // SOCKS5 dialer implementation stub
+    Err(anyhow!("SOCKS outbound TCP dialer not yet implemented"))
+}
+
+pub async fn handle_udp(
+    _client_src: std::net::SocketAddr,
+    _target_dst: std::net::SocketAddr,
+    _payload: bytes::Bytes,
+    _server: &str,
+    _port: u16,
+) -> Result<()> {
+    Err(anyhow!("SOCKS outbound UDP handler not yet implemented"))
+}

ostp-client/src/tunnel/process_lookup.rs

@@ -0,0 +1,193 @@
+#[cfg(target_os = "windows")]
+pub fn get_process_name_from_port(port: u16) -> Option<String> {
+    use winapi::shared::minwindef::ULONG;
+    use winapi::shared::winerror::ERROR_INSUFFICIENT_BUFFER;
+    use winapi::um::iphlpapi::GetExtendedTcpTable;
+    use winapi::shared::tcpmib::{MIB_TCPTABLE_OWNER_PID, MIB_TCPROW_OWNER_PID};
+
+    let mut size: ULONG = 0;
+    let table_class = 5; // TCP_TABLE_OWNER_PID_ALL
+    let mut table = vec![0u8; 1024];
+
+    unsafe {
+        let mut ret = GetExtendedTcpTable(
+            table.as_mut_ptr() as *mut _,
+            &mut size,
+            0,
+            2, // AF_INET
+            table_class,
+            0,
+        );
+
+        if ret == ERROR_INSUFFICIENT_BUFFER {
+            table.resize(size as usize, 0);
+            ret = GetExtendedTcpTable(
+                table.as_mut_ptr() as *mut _,
+                &mut size,
+                0,
+                2, // AF_INET
+                table_class,
+                0,
+            );
+        }
+
+        if ret == 0 {
+            let tcp_table = &*(table.as_ptr() as *const MIB_TCPTABLE_OWNER_PID);
+            let row_ptr = &tcp_table.table[0] as *const MIB_TCPROW_OWNER_PID;
+            for i in 0..tcp_table.dwNumEntries {
+                let row = &*row_ptr.add(i as usize);
+                // Local port is in network byte order
+                let local_port = u16::from_be(row.dwLocalPort as u16);
+                if local_port == port {
+                    return get_process_name_from_pid(row.dwOwningPid);
+                }
+            }
+        }
+    }
+    None
+}
+
+#[cfg(target_os = "windows")]
+pub fn get_process_name_from_port_udp(port: u16) -> Option<String> {
+    use winapi::shared::minwindef::ULONG;
+    use winapi::shared::winerror::ERROR_INSUFFICIENT_BUFFER;
+    use winapi::um::iphlpapi::GetExtendedUdpTable;
+    use winapi::shared::udpmib::{MIB_UDPTABLE_OWNER_PID, MIB_UDPROW_OWNER_PID};
+
+    let mut size: ULONG = 0;
+    let table_class = 1; // UDP_TABLE_OWNER_PID
+    let mut table = vec![0u8; 1024];
+
+    unsafe {
+        let mut ret = GetExtendedUdpTable(
+            table.as_mut_ptr() as *mut _,
+            &mut size,
+            0,
+            2, // AF_INET
+            table_class,
+            0,
+        );
+
+        if ret == ERROR_INSUFFICIENT_BUFFER {
+            table.resize(size as usize, 0);
+            ret = GetExtendedUdpTable(
+                table.as_mut_ptr() as *mut _,
+                &mut size,
+                0,
+                2, // AF_INET
+                table_class,
+                0,
+            );
+        }
+
+        if ret == 0 {
+            let udp_table = &*(table.as_ptr() as *const MIB_UDPTABLE_OWNER_PID);
+            let row_ptr = &udp_table.table[0] as *const MIB_UDPROW_OWNER_PID;
+            for i in 0..udp_table.dwNumEntries {
+                let row = &*row_ptr.add(i as usize);
+                let local_port = u16::from_be(row.dwLocalPort as u16);
+                if local_port == port {
+                    return get_process_name_from_pid(row.dwOwningPid);
+                }
+            }
+        }
+    }
+    None
+}
+
+#[cfg(target_os = "windows")]
+fn get_process_name_from_pid(pid: u32) -> Option<String> {
+    use winapi::um::processthreadsapi::OpenProcess;
+    use winapi::um::psapi::GetModuleBaseNameW;
+    use winapi::um::winnt::{PROCESS_QUERY_INFORMATION, PROCESS_VM_READ};
+    use winapi::um::handleapi::CloseHandle;
+    use std::os::windows::ffi::OsStringExt;
+
+    unsafe {
+        let handle = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 0, pid);
+        if handle.is_null() {
+            return None;
+        }
+
+        let mut buffer = [0u16; 1024];
+        let len = GetModuleBaseNameW(handle, std::ptr::null_mut(), buffer.as_mut_ptr(), buffer.len() as u32);
+        CloseHandle(handle);
+
+        if len > 0 {
+            let name = std::ffi::OsString::from_wide(&buffer[..len as usize]);
+            return Some(name.to_string_lossy().into_owned());
+        }
+    }
+    None
+}
+
+#[cfg(target_os = "linux")]
+pub fn get_process_name_from_port(port: u16) -> Option<String> {
+    use std::fs;
+    use std::io::{BufRead, BufReader};
+
+    let hex_port = format!("{:04X}", port);
+
+    let check_net_file = |path: &str| -> Option<u64> {
+        let file = fs::File::open(path).ok()?;
+        let reader = BufReader::new(file);
+        for line in reader.lines().skip(1).filter_map(Result::ok) {
+            let parts: Vec<&str> = line.split_whitespace().collect();
+            if parts.len() >= 10 {
+                let local_addr = parts[1];
+                if local_addr.ends_with(&format!(":{}", hex_port)) {
+                    if let Ok(inode) = parts[9].parse::<u64>() {
+                        return Some(inode);
+                    }
+                }
+            }
+        }
+        None
+    };
+
+    let target_inode = check_net_file("/proc/net/tcp")
+        .or_else(|| check_net_file("/proc/net/tcp6"))
+        .or_else(|| check_net_file("/proc/net/udp"))
+        .or_else(|| check_net_file("/proc/net/udp6"))?;
+
+    let socket_str = format!("socket:[{}]", target_inode);
+
+    for entry in fs::read_dir("/proc").ok()?.filter_map(Result::ok) {
+        let file_name = entry.file_name();
+        let pid_str = file_name.to_string_lossy();
+        if !pid_str.chars().all(char::is_numeric) {
+            continue;
+        }
+
+        let fd_dir = entry.path().join("fd");
+        if let Ok(fd_entries) = fs::read_dir(fd_dir) {
+            for fd_entry in fd_entries.filter_map(Result::ok) {
+                if let Ok(target) = fs::read_link(fd_entry.path()) {
+                    if target.to_string_lossy() == socket_str {
+                        let exe_path = entry.path().join("exe");
+                        if let Ok(exe_link) = fs::read_link(exe_path) {
+                            if let Some(name) = exe_link.file_name() {
+                                return Some(name.to_string_lossy().into_owned());
+                            }
+                        }
+                        if let Ok(comm) = fs::read_to_string(entry.path().join("comm")) {
+                            return Some(comm.trim().to_string());
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    None
+}
+
+#[cfg(not(any(target_os = "windows", target_os = "linux")))]
+pub fn get_process_name_from_port(_port: u16) -> Option<String> {
+    None
+}
+
+#[cfg(not(target_os = "windows"))]
+pub fn get_process_name_from_port_udp(port: u16) -> Option<String> {
+    get_process_name_from_port(port)
+}

ostp-client/src/tunnel/proxy.rs

@@ -1,531 +0,0 @@
-use std::collections::HashMap;
-use anyhow::{anyhow, Context, Result};
-use tokio::io::{AsyncReadExt, AsyncWriteExt};
-use tokio::net::{TcpListener, TcpStream};
-use tokio::sync::{mpsc, watch};
-use tokio::time::{timeout, Duration};
-
-use crate::config::{ExclusionConfig, LocalProxyConfig, OstpConfig};
-use crate::tunnel::{ProxyEvent, ProxyToClientMsg};
-
-pub async fn run_local_socks5_proxy(
-    cfg: LocalProxyConfig,
-    _ostp: OstpConfig,
-    exclusions: ExclusionConfig,
-    debug: bool,
-    mut shutdown: watch::Receiver<bool>,
-    proxy_events_tx: mpsc::Sender<ProxyEvent>,
-    mut client_msgs_rx: mpsc::Receiver<(u16, ProxyToClientMsg)>,
-) -> Result<()> {
-    let connect_timeout = Duration::from_millis(cfg.connect_timeout_ms.max(1));
-    let listener = TcpListener::bind(&cfg.bind_addr)
-        .await
-        .with_context(|| format!("failed to bind local HTTP/SOCKS5 proxy at {}", cfg.bind_addr))?;
-
-    if debug {
-        eprintln!("[ostp-client] local HTTP/SOCKS5 proxy listening at {}", cfg.bind_addr);
-        eprintln!("[ostp-client] Windows system proxy: set HTTP proxy to {}. tun2socks: SOCKS5 on same address.", cfg.bind_addr);
-    }
-
-    let matcher = ExclusionMatcher::new(&exclusions);
-    let (connect_tx, mut connect_rx) = mpsc::channel(128);
-
-    let mut next_stream_id: u16 = 1;
-    let mut active_streams: HashMap<u16, mpsc::Sender<ProxyToClientMsg>> = HashMap::new();
-
-    loop {
-        tokio::select! {
-            _ = shutdown.changed() => {
-                if *shutdown.borrow() {
-                    break;
-                }
-            }
-            accepted = listener.accept() => {
-                let (socket, _) = accepted?;
-                let stream_id = next_stream_id;
-                next_stream_id = next_stream_id.wrapping_add(1);
-                if next_stream_id == 0 { next_stream_id = 1; }
-
-                let (tx, rx) = mpsc::channel(256);
-                active_streams.insert(stream_id, tx);
-
-                let event_tx = proxy_events_tx.clone();
-                let c_tx = connect_tx.clone();
-                let matcher_clone = matcher.clone();
-                tokio::spawn(async move {
-                    if let Err(err) = handle_proxy_client(
-                        socket,
-                        stream_id,
-                        event_tx,
-                        rx,
-                        c_tx,
-                        connect_timeout,
-                        debug,
-                        matcher_clone,
-                    ).await {
-                        let msg = err.to_string();
-                        // Suppress routine disconnects from spam logs
-                        if !msg.contains("UnexpectedEof")
-                            && !msg.contains("Connection reset")
-                            && !msg.contains("Broken pipe")
-                        {
-                            if debug {
-                                eprintln!("[ostp-client] proxy client error: {err}");
-                            }
-                        }
-                    }
-                });
-            }
-            Some((stream_id, msg)) = client_msgs_rx.recv() => {
-                if let Some(tx) = active_streams.get(&stream_id) {
-                    if tx.send(msg).await.is_err() {
-                        active_streams.remove(&stream_id);
-                    }
-                }
-            }
-            Some(stream_id) = connect_rx.recv() => {
-                active_streams.remove(&stream_id);
-            }
-        }
-    }
-
-    Ok(())
-}
-
-/// Extracts `host:port` from an HTTP absolute-URI like `http://example.com/path` or `https://example.com`.
-/// Falls back to the raw target if already in `host:port` form.
-fn extract_host_port(uri: &str, default_port: u16) -> String {
-    let without_scheme = if let Some(rest) = uri.strip_prefix("https://") {
-        rest
-    } else if let Some(rest) = uri.strip_prefix("http://") {
-        rest
-    } else {
-        uri
-    };
-    // Trim path/query fragment
-    let host_part = without_scheme.split('/').next().unwrap_or(without_scheme);
-    if host_part.contains(':') {
-        host_part.to_string()
-    } else {
-        format!("{}:{}", host_part, default_port)
-    }
-}
-
-async fn handle_proxy_client(
-    mut client: TcpStream,
-    stream_id: u16,
-    event_tx: mpsc::Sender<ProxyEvent>,
-    mut rx: mpsc::Receiver<ProxyToClientMsg>,
-    close_tx: mpsc::Sender<u16>,
-    connect_timeout: Duration,
-    debug: bool,
-    matcher: ExclusionMatcher,
-) -> Result<()> {
-    // Peek the first byte to distinguish SOCKS5 (0x05) from HTTP (any printable ASCII)
-    let mut first_byte = [0_u8; 1];
-    client.read_exact(&mut first_byte).await?;
-
-    let target: String;
-    let is_socks5 = first_byte[0] == 0x05;
-
-    if is_socks5 {
-        // ── SOCKS5 Handshake ──────────────────────────────────────────
-        let mut second_byte = [0_u8; 1];
-        client.read_exact(&mut second_byte).await?;
-        let nmethods = second_byte[0] as usize;
-        if nmethods > 0 {
-            let mut methods_buf = vec![0_u8; nmethods];
-            client.read_exact(&mut methods_buf).await?;
-        }
-        // Reply: version=5, NO AUTHENTICATION
-        client.write_all(&[0x05, 0x00]).await?;
-
-        // ── SOCKS5 Request ────────────────────────────────────────────
-        let mut req = [0_u8; 4];
-        client.read_exact(&mut req).await?;
-        if req[0] != 0x05 {
-            return Err(anyhow!("SOCKS5 request version mismatch"));
-        }
-        if req[1] != 0x01 {
-            // Not CONNECT — send COMMAND NOT SUPPORTED
-            client.write_all(&[0x05, 0x07, 0x00, 0x01, 0, 0, 0, 0, 0, 0]).await?;
-            return Err(anyhow!("unsupported SOCKS5 command {}", req[1]));
-        }
-
-        let mut addr_buf = [0_u8; 256];
-        target = match req[3] {
-            0x01 => {
-                // IPv4: 4 bytes address + 2 bytes port
-                client.read_exact(&mut addr_buf[0..6]).await?;
-                let ip = std::net::Ipv4Addr::new(addr_buf[0], addr_buf[1], addr_buf[2], addr_buf[3]);
-                let port = u16::from_be_bytes([addr_buf[4], addr_buf[5]]);
-                format!("{}:{}", ip, port)
-            }
-            0x03 => {
-                // Domain: 1 byte length, then domain, then 2 bytes port
-                client.read_exact(&mut addr_buf[0..1]).await?;
-                let domain_len = addr_buf[0] as usize;
-                client.read_exact(&mut addr_buf[0..domain_len + 2]).await?;
-                let domain = String::from_utf8_lossy(&addr_buf[0..domain_len]);
-                let port = u16::from_be_bytes([addr_buf[domain_len], addr_buf[domain_len + 1]]);
-                format!("{}:{}", domain, port)
-            }
-            0x04 => {
-                // IPv6: 16 bytes + 2 bytes port
-                client.read_exact(&mut addr_buf[0..18]).await?;
-                let mut octets = [0u8; 16];
-                octets.copy_from_slice(&addr_buf[0..16]);
-                let ip = std::net::Ipv6Addr::from(octets);
-                let port = u16::from_be_bytes([addr_buf[16], addr_buf[17]]);
-                format!("[{}]:{}", ip, port)
-            }
-            atyp => {
-                client.write_all(&[0x05, 0x08, 0x00, 0x01, 0, 0, 0, 0, 0, 0]).await?;
-                return Err(anyhow!("unsupported SOCKS5 address type: {}", atyp));
-            }
-        };
-
-        if debug {
-            eprintln!("[ostp-client] proxy CONNECT stream_id={stream_id} target={target}");
-        }
-        if matcher.should_bypass(&target, connect_timeout).await {
-            return direct_connect_socks5(client, stream_id, &target, close_tx, debug).await;
-        }
-        event_tx.send(ProxyEvent::NewStream { stream_id, target: target.clone() }).await?;
-
-        match timeout(connect_timeout, rx.recv()).await {
-            Ok(Some(ProxyToClientMsg::ConnectOk)) => {
-                // SUCCESS: version, 0=success, reserved, IPv4 type, 4 bytes addr, 2 bytes port
-                client.write_all(&[0x05, 0x00, 0x00, 0x01, 0, 0, 0, 0, 0, 0]).await?;
-            }
-            Ok(Some(ProxyToClientMsg::Error(msg))) => {
-                client.write_all(&[0x05, 0x04, 0x00, 0x01, 0, 0, 0, 0, 0, 0]).await?;
-                let _ = close_tx.send(stream_id).await;
-                return Err(anyhow!("SOCKS5 connect error: {msg}"));
-            }
-            Ok(_) => {
-                client.write_all(&[0x05, 0x05, 0x00, 0x01, 0, 0, 0, 0, 0, 0]).await?;
-                let _ = close_tx.send(stream_id).await;
-                return Err(anyhow!("connect dropped"));
-            }
-            Err(_) => {
-                client.write_all(&[0x05, 0x04, 0x00, 0x01, 0, 0, 0, 0, 0, 0]).await?;
-                let _ = close_tx.send(stream_id).await;
-                return Err(anyhow!("connect timeout"));
-            }
-        }
-    } else {
-        // ── HTTP Proxy (CONNECT and plain GET/POST) ───────────────────
-        // Read the rest of the HTTP request headers byte-by-byte
-        let mut header_bytes = Vec::with_capacity(512);
-        header_bytes.push(first_byte[0]);
-        let mut byte = [0_u8; 1];
-        loop {
-            client.read_exact(&mut byte).await?;
-            header_bytes.push(byte[0]);
-            if header_bytes.ends_with(b"\r\n\r\n") {
-                break;
-            }
-            if header_bytes.len() > 8192 {
-                client.write_all(b"HTTP/1.1 431 Request Header Fields Too Large\r\n\r\n").await?;
-                return Err(anyhow!("HTTP header too large"));
-            }
-        }
-
-        let req_str = String::from_utf8_lossy(&header_bytes);
-        let first_line = req_str.lines().next().unwrap_or("");
-        let parts: Vec<&str> = first_line.split_whitespace().collect();
-        if parts.len() < 2 {
-            client.write_all(b"HTTP/1.1 400 Bad Request\r\n\r\n").await?;
-            return Err(anyhow!("malformed HTTP request line: {:?}", first_line));
-        }
-
-        let method = parts[0].to_uppercase();
-        let raw_uri = parts[1];
-
-        target = if method == "CONNECT" {
-            // CONNECT uses host:port directly — e.g. "CONNECT example.com:443 HTTP/1.1"
-            if raw_uri.contains(':') {
-                raw_uri.to_string()
-            } else {
-                format!("{}:443", raw_uri)
-            }
-        } else {
-            // Plain HTTP: absolute URI like "GET http://example.com/path HTTP/1.1"
-            let default_port = if raw_uri.starts_with("https://") { 443u16 } else { 80u16 };
-            extract_host_port(raw_uri, default_port)
-        };
-
-        if debug {
-            eprintln!("[ostp-client] proxy CONNECT stream_id={stream_id} target={target}");
-        }
-        if matcher.should_bypass(&target, connect_timeout).await {
-            return direct_connect_http(
-                client,
-                stream_id,
-                &target,
-                method.as_str(),
-                header_bytes,
-                close_tx,
-                debug,
-            ).await;
-        }
-        event_tx.send(ProxyEvent::NewStream { stream_id, target: target.clone() }).await?;
-
-        match timeout(connect_timeout, rx.recv()).await {
-            Ok(Some(ProxyToClientMsg::ConnectOk)) => {
-                if method == "CONNECT" {
-                    // For CONNECT, tell client the tunnel is ready
-                    client.write_all(b"HTTP/1.1 200 Connection Established\r\nProxy-Agent: ostp/1.0\r\n\r\n").await?;
-                } else {
-                    // For plain HTTP (GET/POST), we MUST forward the request headers we consumed
-                    // to the server over the newly established tunnel.
-                    event_tx.send(ProxyEvent::Data {
-                        stream_id,
-                        payload: bytes::Bytes::copy_from_slice(&header_bytes),
-                    }).await?;
-                }
-            }
-            Ok(Some(ProxyToClientMsg::Error(msg))) => {
-                client.write_all(b"HTTP/1.1 502 Bad Gateway\r\n\r\n").await?;
-                let _ = close_tx.send(stream_id).await;
-                return Err(anyhow!("HTTP connect error: {msg}"));
-            }
-            Ok(_) => {
-                client.write_all(b"HTTP/1.1 502 Bad Gateway\r\n\r\n").await?;
-                let _ = close_tx.send(stream_id).await;
-                return Err(anyhow!("connect dropped"));
-            }
-            Err(_) => {
-                client.write_all(b"HTTP/1.1 504 Gateway Timeout\r\n\r\n").await?;
-                let _ = close_tx.send(stream_id).await;
-                return Err(anyhow!("connect timeout"));
-            }
-        }
-    }
-
-    // ── Bidirectional raw data forwarding ─────────────────────────────
-    let mut tcp_buf = vec![0_u8; 1024];
-    loop {
-        tokio::select! {
-            read_res = client.read(&mut tcp_buf) => {
-                match read_res {
-                    Ok(0) => {
-                        let _ = event_tx.send(ProxyEvent::Close { stream_id }).await;
-                        if debug {
-                            eprintln!("[ostp-client] proxy CLOSE stream_id={stream_id}");
-                        }
-                        break;
-                    }
-                    Ok(n) => {
-                        let _ = event_tx.send(ProxyEvent::Data {
-                            stream_id,
-                            payload: bytes::Bytes::copy_from_slice(&tcp_buf[..n]),
-                        }).await;
-                    }
-                    Err(_) => {
-                        let _ = event_tx.send(ProxyEvent::Close { stream_id }).await;
-                        if debug {
-                            eprintln!("[ostp-client] proxy CLOSE stream_id={stream_id}");
-                        }
-                        break;
-                    }
-                }
-            }
-            msg = rx.recv() => {
-                match msg {
-                    Some(ProxyToClientMsg::Data(data)) => {
-                        if client.write_all(&data).await.is_err() {
-                            let _ = event_tx.send(ProxyEvent::Close { stream_id }).await;
-                            break;
-                        }
-                    }
-                    Some(ProxyToClientMsg::Close) | Some(ProxyToClientMsg::Error(_)) | None => {
-                        break;
-                    }
-                    Some(ProxyToClientMsg::ConnectOk) => {} // ignored after connect phase
-                }
-            }
-        }
-    }
-
-    let _ = close_tx.send(stream_id).await;
-    Ok(())
-}
-
-#[derive(Clone)]
-struct ExclusionMatcher {
-    domain_suffix: Vec<String>,
-    cidrs: Vec<Cidr>,
-}
-
-impl ExclusionMatcher {
-    fn new(exclusions: &ExclusionConfig) -> Self {
-        let mut cidrs = Vec::new();
-        for ip in &exclusions.ips {
-            if let Some(cidr) = parse_cidr(ip) {
-                cidrs.push(cidr);
-            }
-        }
-
-        Self {
-            domain_suffix: exclusions
-                .domains
-                .iter()
-                .map(|d| d.trim().trim_start_matches('.').to_lowercase())
-                .filter(|d| !d.is_empty())
-                .collect(),
-            cidrs,
-        }
-    }
-
-    async fn should_bypass(&self, target: &str, timeout_value: Duration) -> bool {
-        let (host, port) = match split_host_port(target) {
-            Some(v) => v,
-            None => return false,
-        };
-
-        if self.match_domain(&host) {
-            return true;
-        }
-
-        if self.cidrs.is_empty() {
-            return false;
-        }
-
-        if let Ok(ip) = host.parse::<std::net::IpAddr>() {
-            return self.match_ip(&ip);
-        }
-
-        let lookup_target = (host.clone(), port);
-        match timeout(timeout_value, tokio::net::lookup_host(lookup_target)).await {
-            Ok(Ok(addrs)) => addrs.into_iter().any(|addr| self.match_ip(&addr.ip())),
-            _ => false,
-        }
-    }
-
-    fn match_domain(&self, host: &str) -> bool {
-        if self.domain_suffix.is_empty() {
-            return false;
-        }
-        let host = host.trim_end_matches('.').to_lowercase();
-        self.domain_suffix.iter().any(|suffix| {
-            host == *suffix || host.ends_with(&format!(".{suffix}"))
-        })
-    }
-
-    fn match_ip(&self, ip: &std::net::IpAddr) -> bool {
-        self.cidrs.iter().any(|cidr| cidr.contains(ip))
-    }
-}
-
-#[derive(Clone)]
-enum Cidr {
-    V4(u32, u8),
-    V6(u128, u8),
-}
-
-impl Cidr {
-    fn contains(&self, ip: &std::net::IpAddr) -> bool {
-        match (self, ip) {
-            (Cidr::V4(net, bits), std::net::IpAddr::V4(addr)) => {
-                let mask = if *bits == 0 { 0 } else { u32::MAX << (32 - bits) };
-                let ip = u32::from_be_bytes(addr.octets());
-                (ip & mask) == (*net & mask)
-            }
-            (Cidr::V6(net, bits), std::net::IpAddr::V6(addr)) => {
-                let mask = if *bits == 0 { 0 } else { u128::MAX << (128 - bits) };
-                let ip = u128::from_be_bytes(addr.octets());
-                (ip & mask) == (*net & mask)
-            }
-            _ => false,
-        }
-    }
-}
-
-fn parse_cidr(value: &str) -> Option<Cidr> {
-    let value = value.trim();
-    if value.is_empty() {
-        return None;
-    }
-
-    if let Some((addr_str, bits_str)) = value.split_once('/') {
-        let bits: u8 = bits_str.parse().ok()?;
-        if let Ok(addr) = addr_str.parse::<std::net::IpAddr>() {
-            return match addr {
-                std::net::IpAddr::V4(v4) => Some(Cidr::V4(u32::from_be_bytes(v4.octets()), bits.min(32))),
-                std::net::IpAddr::V6(v6) => Some(Cidr::V6(u128::from_be_bytes(v6.octets()), bits.min(128))),
-            };
-        }
-    }
-
-    if let Ok(addr) = value.parse::<std::net::IpAddr>() {
-        return match addr {
-            std::net::IpAddr::V4(v4) => Some(Cidr::V4(u32::from_be_bytes(v4.octets()), 32)),
-            std::net::IpAddr::V6(v6) => Some(Cidr::V6(u128::from_be_bytes(v6.octets()), 128)),
-        };
-    }
-
-    None
-}
-
-fn split_host_port(target: &str) -> Option<(String, u16)> {
-    if let Some((host, port)) = target.rsplit_once(':') {
-        if host.starts_with('[') && host.ends_with(']') {
-            let host = host.trim_start_matches('[').trim_end_matches(']').to_string();
-            let port = port.parse().ok()?;
-            return Some((host, port));
-        }
-        if host.contains(':') {
-            return None;
-        }
-        let port = port.parse().ok()?;
-        return Some((host.to_string(), port));
-    }
-    None
-}
-
-async fn direct_connect_socks5(
-    mut client: TcpStream,
-    stream_id: u16,
-    target: &str,
-    close_tx: mpsc::Sender<u16>,
-    debug: bool,
-) -> Result<()> {
-    if debug {
-        eprintln!("[ostp-client] proxy BYPASS stream_id={stream_id} target={target}");
-    }
-    let mut remote = TcpStream::connect(target).await
-        .with_context(|| format!("direct connect failed: {target}"))?;
-
-    client.write_all(&[0x05, 0x00, 0x00, 0x01, 0, 0, 0, 0, 0, 0]).await?;
-    let _ = tokio::io::copy_bidirectional(&mut client, &mut remote).await;
-    let _ = close_tx.send(stream_id).await;
-    Ok(())
-}
-
-async fn direct_connect_http(
-    mut client: TcpStream,
-    stream_id: u16,
-    target: &str,
-    method: &str,
-    header_bytes: Vec<u8>,
-    close_tx: mpsc::Sender<u16>,
-    debug: bool,
-) -> Result<()> {
-    if debug {
-        eprintln!("[ostp-client] proxy BYPASS stream_id={stream_id} target={target}");
-    }
-    let mut remote = TcpStream::connect(target).await
-        .with_context(|| format!("direct connect failed: {target}"))?;
-
-    if method == "CONNECT" {
-        client.write_all(b"HTTP/1.1 200 Connection Established\r\nProxy-Agent: ostp/1.0\r\n\r\n").await?;
-    } else {
-        remote.write_all(&header_bytes).await?;
-    }
-
-    let _ = tokio::io::copy_bidirectional(&mut client, &mut remote).await;
-    let _ = close_tx.send(stream_id).await;
-    Ok(())
-}

ostp-client/src/tunnel/router.rs

@@ -0,0 +1,158 @@
+use std::net::IpAddr;
+use crate::config::{RoutingConfig, RoutingRule};
+
+#[derive(Debug, Clone)]
+pub struct Session {
+    pub inbound_tag: String,
+    pub source_ip: Option<IpAddr>,
+    pub destination_ip: Option<IpAddr>,
+    pub destination_port: u16,
+    pub protocol: String, // "tcp" or "udp"
+    pub sni: Option<String>,
+    pub process_name: Option<String>,
+}
+
+pub struct Router {
+    config: RoutingConfig,
+}
+
+impl Router {
+    pub fn new(config: RoutingConfig) -> Self {
+        Self { config }
+    }
+
+    /// Evaluates the session against routing rules and returns the outbound tag
+    pub fn route(&self, session: &Session) -> String {
+        for rule in &self.config.rules {
+            if self.match_rule(rule, session) {
+                return rule.outbound.clone();
+            }
+        }
+        self.config.default_outbound.clone()
+    }
+
+    fn match_rule(&self, rule: &RoutingRule, session: &Session) -> bool {
+        // All specified conditions in a rule must match (AND logic)
+        let mut matched_any_condition = false;
+
+        // 1. Inbound Tag match
+        if let Some(inbounds) = &rule.inbound_tag {
+            if !inbounds.iter().any(|tag| tag == &session.inbound_tag) {
+                return false;
+            }
+            matched_any_condition = true;
+        }
+
+        // 2. Domain / SNI match
+        if let Some(domains) = &rule.domain_suffix {
+            let mut domain_match = false;
+            if let Some(sni) = &session.sni {
+                let sni_lower = sni.to_lowercase();
+                domain_match = domains.iter().any(|d| {
+                    let d_lower = d.to_lowercase();
+                    sni_lower == d_lower || sni_lower.ends_with(&format!(".{}", d_lower))
+                });
+            }
+            if !domain_match {
+                return false;
+            }
+            matched_any_condition = true;
+        }
+
+        // 3. Process match
+        if let Some(processes) = &rule.process_name {
+            let mut proc_match = false;
+            if let Some(proc) = &session.process_name {
+                let proc_lower = proc.to_lowercase();
+                proc_match = processes.iter().any(|p| {
+                    let p_lower = p.to_lowercase();
+                    proc_lower.contains(&p_lower)
+                });
+            }
+            if !proc_match {
+                return false;
+            }
+            matched_any_condition = true;
+        }
+
+        // 4. IP CIDR match
+        if let Some(cidrs) = &rule.ip_cidr {
+            let mut ip_match = false;
+            if let Some(dst_ip) = session.destination_ip {
+                ip_match = cidrs.iter().any(|cidr| {
+                    match ipnet::IpNet::from_str(cidr) {
+                        Ok(net) => net.contains(&dst_ip),
+                        Err(_) => {
+                            // fallback to exact ip match if not a valid CIDR
+                            if let Ok(ip) = cidr.parse::<IpAddr>() {
+                                ip == dst_ip
+                            } else {
+                                false
+                            }
+                        }
+                    }
+                });
+            }
+            if !ip_match {
+                return false;
+            }
+            matched_any_condition = true;
+        }
+
+        // A rule must have at least one condition to match
+        matched_any_condition
+    }
+}
+
+use std::str::FromStr;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_router() {
+        let rules = vec![
+            RoutingRule {
+                domain_suffix: Some(vec!["vk.com".to_string()]),
+                ip_cidr: None,
+                process_name: None,
+                inbound_tag: None,
+                outbound: "direct".to_string(),
+            },
+            RoutingRule {
+                domain_suffix: None,
+                ip_cidr: None,
+                process_name: Some(vec!["telegram.exe".to_string()]),
+                inbound_tag: None,
+                outbound: "proxy-group".to_string(),
+            },
+        ];
+
+        let config = RoutingConfig {
+            rules,
+            default_outbound: "proxy-group".to_string(),
+        };
+
+        let router = Router::new(config);
+
+        let mut session = Session {
+            inbound_tag: "tun-in".to_string(),
+            source_ip: None,
+            destination_ip: None,
+            destination_port: 443,
+            protocol: "tcp".to_string(),
+            sni: Some("api.vk.com".to_string()),
+            process_name: None,
+        };
+
+        assert_eq!(router.route(&session), "direct");
+
+        session.sni = None;
+        session.process_name = Some("C:\\App\\Telegram.exe".to_string());
+        assert_eq!(router.route(&session), "proxy-group");
+
+        session.process_name = Some("chrome.exe".to_string());
+        assert_eq!(router.route(&session), "proxy-group"); // fallback
+    }
+}

ostp-client/src/tunnel/sni_sniff.rs

@@ -0,0 +1,73 @@
+pub fn extract_sni(data: &[u8]) -> Option<String> {
+    // Basic TLS ClientHello parser
+    // Must be at least 43 bytes to contain anything useful
+    if data.len() < 43 {
+        return None;
+    }
+
+    // TLS Record layer: Handshake (22)
+    if data[0] != 0x16 {
+        return None;
+    }
+
+    // Record layer version: 0x0301 (TLS 1.0) or 0x0303 (TLS 1.2)
+    if data[1] != 0x03 {
+        return None;
+    }
+
+    // Handshake type: ClientHello (1)
+    if data[5] != 0x01 {
+        return None;
+    }
+
+    let mut pos = 43; // Skip fixed ClientHello header
+
+    // Skip Session ID
+    if pos >= data.len() { return None; }
+    let session_id_len = data[pos] as usize;
+    pos += 1 + session_id_len;
+
+    // Skip Cipher Suites
+    if pos + 2 > data.len() { return None; }
+    let cipher_suites_len = ((data[pos] as usize) << 8) | (data[pos + 1] as usize);
+    pos += 2 + cipher_suites_len;
+
+    // Skip Compression Methods
+    if pos >= data.len() { return None; }
+    let comp_methods_len = data[pos] as usize;
+    pos += 1 + comp_methods_len;
+
+    // Extensions
+    if pos + 2 > data.len() { return None; }
+    let extensions_len = ((data[pos] as usize) << 8) | (data[pos + 1] as usize);
+    pos += 2;
+
+    let extensions_end = pos + extensions_len;
+    if extensions_end > data.len() { return None; }
+
+    while pos + 4 <= extensions_end {
+        let ext_type = ((data[pos] as usize) << 8) | (data[pos + 1] as usize);
+        let ext_len = ((data[pos + 2] as usize) << 8) | (data[pos + 3] as usize);
+        pos += 4;
+
+        if ext_type == 0x0000 { // Server Name Indication (SNI)
+            if pos + 5 <= extensions_end {
+                let _list_len = ((data[pos] as usize) << 8) | (data[pos + 1] as usize);
+                let name_type = data[pos + 2];
+                if name_type == 0 { // Hostname
+                    let name_len = ((data[pos + 3] as usize) << 8) | (data[pos + 4] as usize);
+                    if pos + 5 + name_len <= extensions_end {
+                        let sni_bytes = &data[pos + 5..pos + 5 + name_len];
+                        if let Ok(sni) = std::str::from_utf8(sni_bytes) {
+                            return Some(sni.to_string());
+                        }
+                    }
+                }
+            }
+            break;
+        }
+        pos += ext_len;
+    }
+
+    None
+}

ostp-client/src/tunnel/udp_nat.rs

@@ -0,0 +1 @@
+// Cleared for refactoring

ostp-client/src/tunnel/wintun_downloader.rs

@@ -1,118 +0,0 @@
-#![allow(unused_imports)]
-use anyhow::Result;
-#[cfg(target_os = "windows")]
-use anyhow::anyhow;
-use std::path::PathBuf;
-
-#[cfg(target_os = "windows")]
-pub fn download_wintun_dll(debug: bool) -> Result<()> {
-    let exe = std::env::current_exe()?;
-    let dir = exe.parent().ok_or_else(|| anyhow!("failed to get binary directory"))?;
-    let dll_path = dir.join("wintun.dll");
-
-    if !dll_path.exists() {
-        if debug {
-            println!("[ostp-client] wintun.dll not found. Downloading automatically...");
-        }
-
-        // Correctly map compilation target architecture to Wintun zip layout folder structure
-        let arch = if cfg!(target_arch = "x86_64") {
-            "amd64"
-        } else if cfg!(target_arch = "aarch64") {
-            "arm64"
-        } else if cfg!(target_arch = "arm") {
-            "arm"
-        } else {
-            "x86"
-        };
-        
-        let zip_path = dir.join("wintun.zip").to_string_lossy().replace('\\', "/");
-        let temp_path = dir.join("wintun_temp").to_string_lossy().replace('\\', "/");
-        let dll_dest = dll_path.to_string_lossy().replace('\\', "/");
-
-        // Explicitly filter via Where-Object to select ONLY the single architecture matching dll.
-        // This guarantees we never overwrite the correct x64 dll with x86/ARM formats during Expand-Archive recursions.
-        let ps_script = format!(
-            "Invoke-WebRequest -Uri 'https://www.wintun.net/builds/wintun-0.14.1.zip' -OutFile '{}' -UseBasicParsing -ErrorAction Stop; \
-             Expand-Archive -Path '{}' -DestinationPath '{}' -Force; \
-             Get-ChildItem -Path '{}' -Filter 'wintun.dll' -Recurse | Where-Object {{ $_.FullName -match 'bin[\\\\/]{}[\\\\/]' }} | Copy-Item -Destination '{}' -Force; \
-             Remove-Item '{}', '{}' -Recurse -Force",
-            zip_path, zip_path, temp_path, temp_path, arch, dll_dest, zip_path, temp_path
-        );
-
-        let output = std::process::Command::new("powershell")
-            .args(["-Command", &ps_script])
-            .current_dir(dir)
-            .output()?;
-
-        if !output.status.success() {
-            let stderr = String::from_utf8_lossy(&output.stderr);
-            return Err(anyhow!("Failed to download and extract wintun.dll for architecture {}: {}", arch, stderr));
-        }
-        if debug {
-            println!("[ostp-client] wintun.dll ({}) successfully downloaded and registered!", arch);
-        }
-    }
-    Ok(())
-}
-
-#[cfg(not(target_os = "windows"))]
-pub fn download_wintun_dll(_debug: bool) -> Result<()> {
-    Ok(())
-}
-
-#[cfg(target_os = "windows")]
-pub fn download_tun2socks(debug: bool) -> Result<()> {
-    let exe = std::env::current_exe()?;
-    let dir = exe.parent().ok_or_else(|| anyhow!("failed to get binary directory"))?;
-    let tun2socks_path = dir.join("tun2socks.exe");
-
-    if !tun2socks_path.exists() {
-        if debug {
-            println!("[ostp-client] tun2socks.exe not found. Downloading automatically...");
-        }
-
-        let arch = if cfg!(target_arch = "x86_64") {
-            "amd64"
-        } else if cfg!(target_arch = "aarch64") {
-            "arm64"
-        } else if cfg!(target_arch = "arm") {
-            "arm"
-        } else {
-            "386"
-        };
-        
-        let zip_path = dir.join("tun2socks.zip").to_string_lossy().replace('\\', "/");
-        let temp_path = dir.join("tun2socks_temp").to_string_lossy().replace('\\', "/");
-        let dest_path = tun2socks_path.to_string_lossy().replace('\\', "/");
-
-        let url = format!("https://github.com/xjasonlyu/tun2socks/releases/download/v2.6.0/tun2socks-windows-{}.zip", arch);
-
-        let ps_script = format!(
-            "Invoke-WebRequest -Uri '{}' -OutFile '{}' -UseBasicParsing -ErrorAction Stop; \
-             Expand-Archive -Path '{}' -DestinationPath '{}' -Force; \
-             Get-ChildItem -Path '{}' -Filter '*.exe' -Recurse | Copy-Item -Destination '{}' -Force; \
-             Remove-Item '{}', '{}' -Recurse -Force",
-            url, zip_path, zip_path, temp_path, temp_path, dest_path, zip_path, temp_path
-        );
-
-        let output = std::process::Command::new("powershell")
-            .args(["-Command", &ps_script])
-            .current_dir(dir)
-            .output()?;
-
-        if !output.status.success() {
-            let stderr = String::from_utf8_lossy(&output.stderr);
-            return Err(anyhow!("Failed to download tun2socks.exe: {}", stderr));
-        }
-        if debug {
-            println!("[ostp-client] tun2socks.exe ({}) downloaded and installed successfully!", arch);
-        }
-    }
-    Ok(())
-}
-
-#[cfg(not(target_os = "windows"))]
-pub fn download_tun2socks(_debug: bool) -> Result<()> {
-    Ok(())
-}

ostp-client/src/tunnel/wintun_handler.rs

@@ -1,155 +0,0 @@
-use anyhow::{anyhow, Result};
-use tokio::sync::watch;
-
-#[cfg(target_os = "windows")]
-pub async fn run_wintun_tunnel(
-    config: crate::config::ClientConfig,
-    mut shutdown: watch::Receiver<bool>,
-) -> Result<()> {
-    use std::net::ToSocketAddrs;
-    use std::process::{Command, Stdio};
-    
-    let debug = config.debug;
-
-    if debug {
-        println!("[ostp-client] Initializing high-performance TUN tunnel via tun2socks...");
-    }
-
-    // 1. Get executable directory to locate tun2socks.exe and wintun.dll
-    let exe = std::env::current_exe()?;
-    let dir = exe.parent().ok_or_else(|| anyhow!("failed to get binary directory"))?;
-    let tun2socks_exe = dir.join("tun2socks.exe");
-
-    if !tun2socks_exe.exists() {
-        return Err(anyhow!("tun2socks.exe not found! Please ensure initialization downloaded it successfully."));
-    }
-
-    // 2. Resolve Server IP for routing table exclusion
-    let server_ip = config.ostp.server_addr.to_socket_addrs()
-        .map_err(|e| anyhow!("Failed to resolve remote server IP: {}", e))?
-        .next()
-        .map(|addr| addr.ip())
-        .ok_or_else(|| anyhow!("Could not resolve host IP for routing exclusion"))?;
-    
-    let server_ip_str = server_ip.to_string();
-
-    if debug {
-        println!("[ostp-client] Resolved remote server IP: {}", server_ip_str);
-    }
-
-    // 3. Run PowerShell script to configure system routes
-    if debug {
-        println!("[ostp-client] Injecting system routing tables and excluding remote proxy...");
-    }
-
-    let setup_script = format!(
-        "$remote_ip = '{}'\n\
-         $route = Get-NetRoute -DestinationPrefix '0.0.0.0/0' | Sort-Object RouteMetric | Select-Object -First 1\n\
-         $gw = $route.NextHop\n\
-         $ifIndex = $route.InterfaceIndex\n\
-         New-NetRoute -DestinationPrefix \"$remote_ip/32\" -NextHop $gw -InterfaceIndex $ifIndex -RouteMetric 1 -ErrorAction SilentlyContinue\n\
-         New-NetRoute -DestinationPrefix \"1.1.1.1/32\" -NextHop $gw -InterfaceIndex $ifIndex -RouteMetric 1 -ErrorAction SilentlyContinue\n",
-        server_ip_str
-    );
-
-    let out = Command::new("powershell")
-        .args(["-Command", &setup_script])
-        .output()?;
-    
-    if !out.status.success() && debug {
-        println!("[ostp-client] Warning: Setup routing returned: {}", String::from_utf8_lossy(&out.stderr));
-    }
-
-    // 4. Prepare and launch tun2socks.exe in the background
-    let proxy_url = format!("socks5://{}", config.local_proxy.bind_addr);
-    
-    if debug {
-        println!("[ostp-client] Spawning tun2socks daemon pointing to {}", proxy_url);
-    }
-
-    let mut child = Command::new(&tun2socks_exe)
-        .args([
-            "-device", "ostp_tun",
-            "-proxy", &proxy_url,
-            "-loglevel", if debug { "debug" } else { "error" }
-        ])
-        .current_dir(dir)
-        .stdout(Stdio::piped())
-        .stderr(Stdio::piped())
-        .spawn()
-        .map_err(|e| anyhow!("Failed to launch tun2socks.exe background process: {}", e))?;
-
-    // 5. Once tun2socks creates the interface, apply network settings (IP, metric, DNS)
-    tokio::time::sleep(tokio::time::Duration::from_secs(2)).await;
-
-    if debug {
-        println!("[ostp-client] Applying network configurations onto 'ostp_tun' interface...");
-    }
-
-    let net_setup = "\
-        netsh interface ipv4 set address name=\"ostp_tun\" static 10.1.0.2 255.255.255.0 10.1.0.1\n\
-        netsh interface ipv4 set interface name=\"ostp_tun\" metric=5\n\
-        netsh interface ipv4 set dnsservers name=\"ostp_tun\" static 1.1.1.1 primary\n";
-    
-    let _ = Command::new("powershell")
-        .args(["-Command", net_setup])
-        .output()?;
-
-    println!("[client] TUN Tunnel established, internet traffic is now routing through OSTP.");
-
-    // 6. Spawn thread to keep logging tun2socks output if in debug mode
-    let mut stdout = child.stdout.take();
-    let mut stderr = child.stderr.take();
-    if debug {
-        std::thread::spawn(move || {
-            use std::io::{BufRead, BufReader};
-            if let Some(out) = stdout.take() {
-                let reader = BufReader::new(out);
-                for line in reader.lines().map_while(Result::ok) {
-                    println!("[tun2socks] {}", line);
-                }
-            }
-        });
-        std::thread::spawn(move || {
-            use std::io::{BufRead, BufReader};
-            if let Some(err) = stderr.take() {
-                let reader = BufReader::new(err);
-                for line in reader.lines().map_while(Result::ok) {
-                    println!("[tun2socks err] {}", line);
-                }
-            }
-        });
-    }
-
-    // 7. Wait for shutdown signal
-    let _ = shutdown.changed().await;
-
-    println!("[client] Deactivating TUN tunnel and restoring system network topology...");
-
-    // 8. Terminate tun2socks
-    let _ = child.kill();
-
-    // 9. Run cleanup routing script
-    let cleanup_script = format!(
-        "$remote_ip = '{}'\n\
-         Remove-NetRoute -DestinationPrefix \"$remote_ip/32\" -Confirm:$false -ErrorAction SilentlyContinue\n\
-         Remove-NetRoute -DestinationPrefix \"1.1.1.1/32\" -Confirm:$false -ErrorAction SilentlyContinue\n",
-        server_ip_str
-    );
-
-    let _ = Command::new("powershell")
-        .args(["-Command", &cleanup_script])
-        .output()?;
-
-    println!("[client] TUN Tunnel stopped.");
-    
-    Ok(())
-}
-
-#[cfg(not(target_os = "windows"))]
-pub async fn run_wintun_tunnel(
-    _config: crate::config::ClientConfig,
-    _shutdown: watch::Receiver<bool>,
-) -> Result<()> {
-    Err(anyhow!("Wintun is only supported on Windows!"))
-}

ostp-client/test_udp.rs

@@ -0,0 +1 @@
+fn main() { let x: () = netstack_smoltcp::StackBuilder::default().build().unwrap(); }

ostp-control/dist/icons.svg

@@ -0,0 +1,24 @@
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+    <defs><clipPath id="bluesky-clip"><path fill="#fff" d="M.1.85h15.3v15.3H.1z"/></clipPath></defs>
+  </symbol>
+  <symbol id="discord-icon" viewBox="0 0 20 19">
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+  </symbol>
+  <symbol id="documentation-icon" viewBox="0 0 21 20">
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+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M3 10a2.78 2.78 0 0 1 2.778-2.778c.555 0 1.209.097 1.748-.047.48-.129.854-.503.982-.982.145-.54.048-1.194.048-1.749a2.78 2.78 0 0 1 2.777-2.777"/>
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