add sockets to gui

src/control_server.c

@@ -767,6 +767,23 @@ static void send_conn_list(struct control_server* server, struct control_client*
 static void send_socket_list(struct control_server* server, struct control_client* client, uint8_t seq_id) {
     struct UTUN_INSTANCE* instance = server->instance;
 
+    if (!instance || !instance->etcp_sockets) {
+        uint16_t rsp_size = ETCPMON_SOCKET_LIST_SIZE(0);
+        uint8_t* buffer = (uint8_t*)u_malloc(rsp_size);
+        if (!buffer) return;
+
+        struct etcpmon_msg_header* hdr = (struct etcpmon_msg_header*)buffer;
+        etcpmon_build_header(hdr, sizeof(struct etcpmon_rsp_socket_list),
+                             ETCPMON_RSP_SOCKET_LIST, seq_id);
+
+        struct etcpmon_rsp_socket_list* rsp = (struct etcpmon_rsp_socket_list*)(buffer + sizeof(*hdr));
+        rsp->count = 0;
+
+        send(client->fd, buffer, rsp_size, 0);
+        u_free(buffer);
+        return;
+    }
+
     uint8_t count = 0;
     struct ETCP_SOCKET* sock = instance->etcp_sockets;
     while (sock && count < ETCPMON_MAX_CONNECTIONS) {
@@ -774,6 +791,8 @@ static void send_socket_list(struct control_server* server, struct control_clien
         sock = sock->next;
     }
 
+    if (count > ETCPMON_MAX_CONNECTIONS) count = ETCPMON_MAX_CONNECTIONS;
+
     uint16_t rsp_size = ETCPMON_SOCKET_LIST_SIZE(count);
     uint8_t* buffer = (uint8_t*)u_malloc(rsp_size);
     if (!buffer) {

tools/etcpmon/etcpmon_client.c

@@ -476,6 +476,7 @@ static void handle_response(struct etcpmon_client* client, uint8_t msg_type,
             struct etcpmon_rsp_socket_list* rsp = (struct etcpmon_rsp_socket_list*)payload;
             uint8_t count = rsp->count;
 
+            if (count > 16) count = 16;  /* Limit to prevent buffer overflow */
             if (payload_size < sizeof(*rsp) + count * sizeof(struct etcpmon_socket_info)) break;
 
             if (client->socket_list) {

tools/etcpmon/etcpmon_gui.c

@@ -955,11 +955,14 @@ static const char* nat_type_to_string(uint8_t nat_type) {
 void etcpmon_gui_update_socket_list(struct etcpmon_app* app,
                                      struct etcpmon_socket_info* list,
                                      uint8_t count) {
-    if (!app || !app->hListSockets) return;
+    if (!app || !app->hListSockets || !list || count == 0 || count > 32) return;
 
     SendMessage(app->hListSockets, LB_RESETCONTENT, 0, 0);
 
     for (uint8_t i = 0; i < count; i++) {
+        if (!list[i].ip || list[i].ip[0] == '\0') continue;
+        if (!list[i].name || list[i].name[0] == '\0') continue;
+
         char display[128];
         const char* nat_str = nat_type_to_string(list[i].nat_type);
         if (list[i].is_ipv6) {