Add network debugging functionality and enhance packet capture monitoring

lib/services/protocol_blocking_service.dart

@@ -73,7 +73,7 @@ class ProtocolBlockingService {
     }
     
     try {
-      // Monitor peer traffic directly using tcpdump on wg0 interface
+      // Monitor peer traffic directly using tcpdump on ALL interfaces
       await _monitorPeerTraffic();
       
       if (_scanCount % 100 == 0) {
@@ -82,6 +82,9 @@ class ProtocolBlockingService {
         if (_scanCount == 100) {
           await _testPeerConnectivity();
         }
+        if (_scanCount == 200) {
+          await _debugNetworking();
+        }
       }
     } catch (e) {
       print('❌ Error monitoring peer traffic: $e');
@@ -89,12 +92,12 @@ class ProtocolBlockingService {
   }
   
   static Future<void> _monitorPeerTraffic() async {
-    // Capture ANY packet on wg0 interface and print it
+    // Capture ANY packet on ALL interfaces and print it
     try {
       final process = await Process.start('timeout', [
         '0.1', // Very short timeout
         'tcpdump',
-        '-i', 'wg0',
+        '-i', 'any', // Monitor ALL interfaces
         '-c', '1',
         '-v', // Verbose
       ]);
@@ -109,7 +112,7 @@ class ProtocolBlockingService {
       
       if (exitCode == 0 && output.isNotEmpty) {
         final packetData = output.join().trim();
-        print('📦 PACKET DETECTED: $packetData');
+        print('📦 PACKET DETECTED ON ANY INTERFACE: $packetData');
         
         // Check if it's from our monitored peers
         for (final peerIP in _activePeerIPs) {
@@ -251,6 +254,60 @@ class ProtocolBlockingService {
     }
   }
   
+  static Future<void> _debugNetworking() async {
+    print('🔧 NETWORK DEBUGGING...');
+    
+    try {
+      // Check all network interfaces
+      print('📡 Available network interfaces:');
+      final ifaceResult = await Process.run('ip', ['link', 'show']);
+      if (ifaceResult.exitCode == 0) {
+        print(ifaceResult.stdout.toString().trim());
+      }
+      
+      // Check specifically for wg0
+      print('\n🔍 WireGuard wg0 interface details:');
+      final wg0Result = await Process.run('ip', ['addr', 'show', 'wg0']);
+      if (wg0Result.exitCode == 0) {
+        print(wg0Result.stdout.toString().trim());
+      } else {
+        print('❌ wg0 interface not found: ${wg0Result.stderr}');
+      }
+      
+      // Check WireGuard status
+      print('\n📋 WireGuard peer status:');
+      final wgResult = await Process.run('wg', ['show']);
+      if (wgResult.exitCode == 0) {
+        print(wgResult.stdout.toString().trim());
+      }
+      
+      // Try tcpdump on different interfaces
+      print('\n🕵️ Testing packet capture capabilities:');
+      
+      // Test Docker internal interface
+      final dockerTest = await Process.run('timeout', ['2', 'tcpdump', '-i', 'any', '-c', '1']);
+      if (dockerTest.exitCode == 0 && dockerTest.stdout.toString().isNotEmpty) {
+        print('✅ Can capture on "any" interface');
+        print('   Sample: ${dockerTest.stdout.toString().trim()}');
+      } else {
+        print('❌ Cannot capture on "any" interface');
+        print('   Error: ${dockerTest.stderr}');
+      }
+      
+      // Test if we need different interface name
+      final ethTest = await Process.run('timeout', ['2', 'tcpdump', '-i', 'eth0', '-c', '1']);
+      if (ethTest.exitCode == 0 && ethTest.stdout.toString().isNotEmpty) {
+        print('✅ Traffic detected on eth0');
+        print('   Sample: ${ethTest.stdout.toString().trim()}');
+      }
+      
+    } catch (e) {
+      print('❌ Network debugging error: $e');
+    }
+    
+    print('🔧 Network debugging complete\n');
+  }
+  
   static List<Connection> _parseConnections(String output, String protocol) {
     final connections = <Connection>[];
     final lines = output.split('\n');