Fix frontend ignoring tunnel errors & fix blocking wintun routines

ostp-client/src/tunnel/native_handler.rs

@@ -70,18 +70,22 @@ pub async fn run_native_tunnel(
             New-NetRoute -DestinationPrefix '0.0.0.0/0' -InterfaceAlias 'ostp_tun' -NextHop '10.1.0.1' -RouteMetric 1 -ErrorAction SilentlyContinue\n",
             server_ip_str, current_exe
         );
-        let _ = Command::new("powershell")
+        let _ = tokio::task::spawn_blocking(move || {
+            Command::new("powershell")
                 .creation_flags(CREATE_NO_WINDOW)
                 .args(["-NoProfile", "-Command", &setup_script])
-            .output()?;
+                .output()
+        }).await.unwrap()?;
         
         if let Some(ref dns) = config.dns_server {
             if !dns.is_empty() {
                 let net_setup = format!("netsh interface ipv4 set dnsservers name=\"ostp_tun\" static {} primary\n", dns);
-                let _ = Command::new("powershell")
+                let _ = tokio::task::spawn_blocking(move || {
+                    Command::new("powershell")
                         .creation_flags(CREATE_NO_WINDOW)
                         .args(["-NoProfile", "-Command", &net_setup])
-                    .output()?;
+                        .output()
+                }).await.unwrap()?;
             }
         }
     }

ostp-client/src/tunnel/wintun_handler.rs

@@ -60,14 +60,16 @@ pub async fn run_wintun_tunnel(
     // 1. Delete stale TUN adapter if it exists from a previous run.
     //    This prevents wintun from creating "ostp_tun 2", "ostp_tun 3", etc.
     tracing::info!("Cleaning up stale TUN adapter...");
-    let _ = Command::new("powershell")
+    let _ = tokio::task::spawn_blocking(move || {
+        Command::new("powershell")
             .creation_flags(CREATE_NO_WINDOW)
             .args(["-NoProfile", "-Command", &format!(
                 "Get-NetAdapter -Name '{TUN_NAME}*' -ErrorAction SilentlyContinue | \
                  Disable-NetAdapter -Confirm:$false -ErrorAction SilentlyContinue; \
                  netsh interface set interface \"{TUN_NAME}\" admin=disable 2>$null"
             )])
-        .output();
+            .output()
+    }).await;
     // Brief pause to let the driver release the adapter
     tokio::time::sleep(std::time::Duration::from_millis(200)).await;
 
@@ -138,11 +140,13 @@ pub async fn run_wintun_tunnel(
     let mut adapter_ready = false;
     while tokio::time::Instant::now() < adapter_deadline {
         tokio::time::sleep(std::time::Duration::from_millis(250)).await;
-        let check = Command::new("powershell")
+        let check = tokio::task::spawn_blocking(move || {
+            Command::new("powershell")
                 .creation_flags(CREATE_NO_WINDOW)
                 .args(["-NoProfile", "-Command",
                     &format!("(Get-NetAdapter -Name '{TUN_NAME}' -ErrorAction SilentlyContinue).Status")])
-            .output();
+                .output()
+        }).await.unwrap();
         if let Ok(out) = check {
             let status = String::from_utf8_lossy(&out.stdout).trim().to_string();
             if debug {
@@ -181,10 +185,12 @@ pub async fn run_wintun_tunnel(
         }
     }
     
-    let _ = Command::new("powershell")
+    let _ = tokio::task::spawn_blocking(move || {
+        Command::new("powershell")
             .creation_flags(CREATE_NO_WINDOW)
             .args(["-NoProfile", "-Command", &net_setup])
-        .output()?;
+            .output()
+    }).await.unwrap()?;
 
     tracing::info!("TUN tunnel active. All traffic is routed through OSTP.");
 

ostp-gui/src-tauri/Cargo.lock

@@ -2632,7 +2632,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-client"
-version = "0.2.58"
+version = "0.2.60"
 dependencies = [
  "anyhow",
  "base64 0.22.1",
@@ -2662,7 +2662,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-core"
-version = "0.2.58"
+version = "0.2.60"
 dependencies = [
  "anyhow",
  "bytes",

ostp-gui/src/main.js

@@ -367,6 +367,13 @@ window.addEventListener('DOMContentLoaded', async () => {
   setState('disconnected');
 
   // Event wiring
+  if (window.__TAURI__ && window.__TAURI__.event) {
+    window.__TAURI__.event.listen('tunnel-error', (evt) => {
+      setState('disconnected');
+      showToast(String(evt.payload), 'error');
+    });
+  }
+
   btnConnect.addEventListener('click',       handleToggle);
   btnGoSettings.addEventListener('click',    () => showScreen('settings'));
   btnBack.addEventListener('click',          () => showScreen('home'));