Send server SSH version immediately after tunnel_ack in wssshc to prevent timeouts

wssshtools/tunnel.c

@@ -150,6 +150,27 @@ void handle_tunnel_request(SSL *ssl, const char *request_id, int debug) {
         fflush(stdout);
     }
 
+    // Send client version to target SSH server
+    const char *client_version = "SSH-2.0-OpenSSH_9.9p1 Debian-3\r\n";
+    size_t version_len = strlen(client_version);
+    if (send(ssh_sock, client_version, version_len, 0) < 0) {
+        perror("Send client version failed");
+        return;
+    }
+
+    // Receive server version
+    char server_version_buf[256];
+    int bytes_read = recv(ssh_sock, server_version_buf, sizeof(server_version_buf) - 1, 0);
+    if (bytes_read <= 0) {
+        perror("Receive server version failed");
+        return;
+    }
+    server_version_buf[bytes_read] = '\0';
+    if (debug) {
+        printf("[DEBUG - Tunnel] Received server version: %s", server_version_buf);
+        fflush(stdout);
+    }
+
     // Send tunnel_ack back to server
     char ack_msg[256];
     snprintf(ack_msg, sizeof(ack_msg), "{\"type\":\"tunnel_ack\",\"request_id\":\"%s\"}", request_id);
@@ -164,6 +185,29 @@ void handle_tunnel_request(SSL *ssl, const char *request_id, int debug) {
         return;
     }
     
+    // Send server version as tunnel_response immediately
+    // Convert to hex
+    size_t hex_size = (size_t)bytes_read * 2 + 1;
+    if (hex_size > 256) hex_size = 256;
+    char hex_data[256];
+    for (int i = 0; i < bytes_read && (size_t)i * 2 < hex_size - 1; i++) {
+        sprintf(hex_data + i * 2, "%02x", (unsigned char)server_version_buf[i]);
+    }
+    hex_data[bytes_read * 2] = '\0';
+    
+    char response_msg[512];
+    snprintf(response_msg, sizeof(response_msg), "{\"type\":\"tunnel_response\",\"request_id\":\"%s\",\"data\":\"%s\"}", request_id, hex_data);
+    
+    if (debug) {
+        printf("[DEBUG - WebSockets] Sending server version immediately: %s\n", response_msg);
+        fflush(stdout);
+    }
+    
+    if (!send_websocket_frame(ssl, response_msg)) {
+        fprintf(stderr, "Send server version failed\n");
+        return;
+    }
+    
     // Start bidirectional forwarding between WebSocket and SSH server
     thread_args_t *thread_args = malloc(sizeof(thread_args_t));
     if (thread_args) {