Add nDPI protocol analyzer and integrate with handshake analysis

Dockerfile

@@ -6,8 +6,22 @@ RUN apt-get update && apt-get install -y \
     iproute2 \
     iptables \
     tcpdump \
+    build-essential \
+    git \
+    libpcap-dev \
+    libjson-c-dev \
+    pkg-config \
     && rm -rf /var/lib/apt/lists/*
 
+# Build and install nDPI
+RUN git clone https://github.com/ntop/nDPI.git /tmp/nDPI && \
+    cd /tmp/nDPI && \
+    ./autogen.sh && \
+    make && \
+    make install && \
+    ldconfig && \
+    rm -rf /tmp/nDPI
+
 WORKDIR /app
 
 # Copy pubspec files first (for dependency caching)
@@ -18,6 +32,10 @@ RUN dart pub get
 
 # Copy source code (invalidates cache from here)
 COPY lib/ ./lib/
+COPY protocol_analyzer.c ./
+
+# Compile the C protocol analyzer
+RUN gcc -o protocol_analyzer protocol_analyzer.c -lndpi -lpcap
 
 # Compile the application
 RUN dart compile exe lib/main.dart -o waylume_server

lib/services/protocol_blocking_service.dart

@@ -358,55 +358,84 @@ class ProtocolBlockingService {
     }
   }
   
-  static void _analyzeHandshake(String handshakeData, Connection conn) {
+  static Future<void> _analyzeHandshake(String handshakeData, Connection conn) async {
-    print('════════════════ HANDSHAKE SIGNATURE ANALYSIS ════════════════');
+    print('════════════════ nDPI PROTOCOL ANALYSIS ════════════════');
     print('📍 Connection: $conn');
     
-    // Extract raw bytes from tcpdump hex output
+    // Extract hex bytes from tcpdump output
     final hexBytes = _extractHexBytes(handshakeData);
-    final asciiData = _extractAsciiFromHex(hexBytes);
     
-    print('📊 Raw Data Length: ${handshakeData.length} chars');
+    if (hexBytes.isEmpty) {
-    print('🔢 Hex Bytes (first 64): ${hexBytes.take(64).join(' ')}');
+      print('❌ No hex data found in tcpdump output');
-    print('📝 ASCII Representation: ${asciiData.replaceAll('\n', '\\n').replaceAll('\r', '\\r')}');
+      print('══════════════════════════════════════════════════════════════');
-    print('🔍 First 32 bytes as string: ${String.fromCharCodes(hexBytes.take(32).map((h) => int.tryParse(h, radix: 16) ?? 0).where((b) => b >= 32 && b <= 126))}');
+      return;
-    
-    // Protocol detection with signature details
-    final data = handshakeData.toLowerCase();
-    String? detectedProtocol;
-    String signature = '';
-    
-    if (data.contains('bittorrent protocol') || hexBytes.join('').contains('13426974546f7272656e742070726f746f636f6c')) {
-      detectedProtocol = 'BitTorrent';
-      signature = 'BitTorrent handshake signature detected';
-    } else if (data.contains('ssh-2.0') || data.contains('ssh-1.')) {
-      detectedProtocol = 'SSH';
-      signature = 'SSH protocol version string';
-    } else if (data.contains('get ') || data.contains('post ') || data.contains('http/')) {
-      detectedProtocol = 'HTTP';
-      signature = 'HTTP request headers';
-    } else if (data.contains('220 ') && conn.remotePort == 25) {
-      detectedProtocol = 'SMTP';
-      signature = 'SMTP welcome message';
-    } else if (data.contains('220 ') && conn.remotePort == 21) {
-      detectedProtocol = 'FTP';
-      signature = 'FTP welcome message';
-    } else if (hexBytes.isNotEmpty && hexBytes.first == '16' && hexBytes.length > 5) {
-      // TLS detection
-      detectedProtocol = 'TLS/SSL';
-      signature = 'TLS ClientHello/ServerHello (0x16 record type)';
     }
     
-    if (detectedProtocol != null) {
+    // Convert hex bytes to single hex string for C analyzer
-      print('🎯 PROTOCOL IDENTIFIED: $detectedProtocol');
+    final hexString = hexBytes.join('');
-      print('📋 Signature: $signature');
+    print('🔢 Analyzing ${hexBytes.length} bytes of packet data');
-    } else {
+    
-      print('❓ UNKNOWN PROTOCOL');
+    try {
-      print('💡 Pattern not recognized - logging for analysis');
+      // Call our C nDPI analyzer
+      final result = await Process.run('./protocol_analyzer', [hexString]);
+      
+      if (result.exitCode == 0) {
+        print('✅ nDPI Analysis Results:');
+        print(result.stdout.toString().trim());
+        
+        // Parse JSON output to extract protocol info
+        try {
+          final jsonStr = result.stdout.toString().trim();
+          // Simple protocol extraction - look for protocol field
+          final protocolMatch = RegExp(r'"protocol":\s*"([^"]+)"').firstMatch(jsonStr);
+          final categoryMatch = RegExp(r'"category":\s*"([^"]+)"').firstMatch(jsonStr);
+          
+          if (protocolMatch != null) {
+            final protocol = protocolMatch.group(1) ?? 'Unknown';
+            final category = categoryMatch?.group(1) ?? 'Unknown';
+            
+            print('🎯 DETECTED: $protocol (Category: $category)');
+            
+            // Check if this is a protocol we want to block
+            if (_shouldBlockProtocol(protocol, category)) {
+              print('🚫 BLOCKING PROTOCOL: $protocol');
+              // TODO: Implement blocking logic here
+            } else {
+              print('✅ ALLOWING PROTOCOL: $protocol');
+            }
+          }
+        } catch (e) {
+          print('⚠️  Error parsing nDPI results: $e');
+        }
+        
+      } else {
+        print('❌ nDPI analyzer failed:');
+        print('   Exit code: ${result.exitCode}');
+        print('   Error: ${result.stderr}');
+      }
+    } catch (e) {
+      print('❌ Error running nDPI analyzer: $e');
     }
+    
     print('══════════════════════════════════════════════════════════════');
   }
   
+  static bool _shouldBlockProtocol(String protocol, String category) {
+    // Define protocols/categories to block
+    final blockedProtocols = {
+      'BitTorrent', 'uTorrent', 'Transmission', 'qBittorrent',
+      'eMule', 'KaZaA', 'Gnutella', 'DirectConnect',
+      'Skype_Call', // Block Skype calls but allow chat
+    };
+    
+    final blockedCategories = {
+      'Download', 'P2P', 'FileSharing'
+    };
+    
+    return blockedProtocols.contains(protocol) || 
+           blockedCategories.contains(category);
+  }
+  
   static List<String> _extractHexBytes(String tcpdumpOutput) {
     final hexPattern = RegExp(r'0x[0-9a-f]+:\s*([0-9a-f\s]+)', caseSensitive: false);
     final matches = hexPattern.allMatches(tcpdumpOutput);

protocol_analyzer.c

@@ -0,0 +1,121 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pcap.h>
+#include <ndpi_api.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+
+struct ndpi_detection_module_struct *ndpi_struct = NULL;
+struct ndpi_flow_struct *ndpi_flow = NULL;
+struct ndpi_id_struct *src_id = NULL, *dst_id = NULL;
+
+void init_ndpi() {
+    NDPI_PROTOCOL_BITMASK all;
+    
+    ndpi_struct = ndpi_init_detection_module();
+    if (ndpi_struct == NULL) {
+        printf("ERROR: ndpi_init_detection_module failed\n");
+        exit(1);
+    }
+    
+    // Enable all protocols
+    NDPI_BITMASK_SET_ALL(all);
+    ndpi_set_protocol_detection_bitmask2(ndpi_struct, &all);
+    
+    ndpi_finalize_initialization(ndpi_struct);
+    
+    // Allocate flow and ID structures
+    ndpi_flow = calloc(1, NDPI_DETECTION_ONLY_IPV4_FLOW_SIZE);
+    src_id = calloc(1, NDPI_ID_SIZE);
+    dst_id = calloc(1, NDPI_ID_SIZE);
+}
+
+void cleanup_ndpi() {
+    if (ndpi_flow) free(ndpi_flow);
+    if (src_id) free(src_id);
+    if (dst_id) free(dst_id);
+    if (ndpi_struct) ndpi_exit_detection_module(ndpi_struct);
+}
+
+void analyze_packet_from_hex(const char* hex_data) {
+    // Convert hex string to binary data
+    size_t hex_len = strlen(hex_data);
+    if (hex_len % 2 != 0) {
+        printf("ERROR: Invalid hex data length\n");
+        return;
+    }
+    
+    size_t bin_len = hex_len / 2;
+    unsigned char *packet_data = malloc(bin_len);
+    
+    for (size_t i = 0; i < bin_len; i++) {
+        sscanf(hex_data + 2*i, "%2hhx", &packet_data[i]);
+    }
+    
+    // Basic IP header parsing
+    struct iphdr *ip_header = (struct iphdr*)packet_data;
+    if (bin_len < sizeof(struct iphdr) || ip_header->version != 4) {
+        printf("ERROR: Not a valid IPv4 packet\n");
+        free(packet_data);
+        return;
+    }
+    
+    uint32_t src_ip = ntohl(ip_header->saddr);
+    uint32_t dst_ip = ntohl(ip_header->daddr);
+    uint16_t src_port = 0, dst_port = 0;
+    
+    // Extract ports for TCP/UDP
+    if (ip_header->protocol == IPPROTO_TCP) {
+        struct tcphdr *tcp_header = (struct tcphdr*)(packet_data + (ip_header->ihl * 4));
+        src_port = ntohs(tcp_header->source);
+        dst_port = ntohs(tcp_header->dest);
+    } else if (ip_header->protocol == IPPROTO_UDP) {
+        struct udphdr *udp_header = (struct udphdr*)(packet_data + (ip_header->ihl * 4));
+        src_port = ntohs(udp_header->source);
+        dst_port = ntohs(udp_header->dest);
+    }
+    
+    // Reset flow for new analysis
+    memset(ndpi_flow, 0, NDPI_DETECTION_ONLY_IPV4_FLOW_SIZE);
+    
+    // Perform nDPI detection
+    ndpi_protocol protocol = ndpi_detection_process_packet(
+        ndpi_struct, ndpi_flow, packet_data, bin_len,
+        0, /* timestamp */
+        src_id, dst_id
+    );
+    
+    // Output results in JSON format for easy parsing
+    printf("{\n");
+    printf("  \"src_ip\": \"%u.%u.%u.%u\",\n", 
+           (src_ip >> 24) & 0xFF, (src_ip >> 16) & 0xFF,
+           (src_ip >> 8) & 0xFF, src_ip & 0xFF);
+    printf("  \"dst_ip\": \"%u.%u.%u.%u\",\n",
+           (dst_ip >> 24) & 0xFF, (dst_ip >> 16) & 0xFF,
+           (dst_ip >> 8) & 0xFF, dst_ip & 0xFF);
+    printf("  \"src_port\": %u,\n", src_port);
+    printf("  \"dst_port\": %u,\n", dst_port);
+    printf("  \"protocol\": \"%s\",\n", ndpi_protocol2name(ndpi_struct, protocol, NULL, 0));
+    printf("  \"category\": \"%s\",\n", ndpi_category_get_name(ndpi_struct, protocol.category));
+    printf("  \"confidence\": %u\n", protocol.confidence);
+    printf("}\n");
+    
+    free(packet_data);
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        printf("Usage: %s <hex_packet_data>\n", argv[0]);
+        printf("Example: %s \"4500003c...\"\n", argv[0]);
+        return 1;
+    }
+    
+    init_ndpi();
+    analyze_packet_from_hex(argv[1]);
+    cleanup_ndpi();
+    
+    return 0;
+}