Make privilege, port and fd handling reliable in tests

src/transport_layer/stcp_server.c

@@ -335,11 +335,27 @@ struct stcp_server *stcp_server_create(struct UASYNC *ua, uint16_t port,
         DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "listen failed err=%d", socket_get_error());
         socket_close_wrapper(srv->listen_sock); u_free(srv); return NULL;
     }
+    uint16_t bound_port = stcp_server_get_port(srv);
+    if (!bound_port) { socket_close_wrapper(srv->listen_sock); u_free(srv); return NULL; }
     srv->listen_id = uasync_add_socket_t(ua, srv->listen_sock, server_accept_cb, NULL, NULL, "stcp_listen", srv);
-    DEBUG_INFO(DEBUG_CATEGORY_ETCP, "stcp_server: listening on port %u family=%s", port, use_family == AF_INET ? "v4" : "v6");
+    DEBUG_INFO(DEBUG_CATEGORY_ETCP, "stcp_server: listening on port %u family=%s", bound_port, use_family == AF_INET ? "v4" : "v6");
     return srv;
 }
 
+uint16_t stcp_server_get_port(const struct stcp_server *srv) {
+    if (!srv) { DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "stcp_server_get_port: invalid server"); return 0; }
+    struct sockaddr_storage address;
+    socklen_t size = sizeof(address);
+    if (getsockname(srv->listen_sock, (struct sockaddr *)&address, &size) != 0) {
+        DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "stcp_server_get_port: getsockname failed err=%d", socket_get_error());
+        return 0;
+    }
+    if (address.ss_family == AF_INET) return ntohs(((struct sockaddr_in *)&address)->sin_port);
+    if (address.ss_family == AF_INET6) return ntohs(((struct sockaddr_in6 *)&address)->sin6_port);
+    DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "stcp_server_get_port: unexpected family=%d", address.ss_family);
+    return 0;
+}
+
 void stcp_server_destroy(struct stcp_server *srv) {
     if (!srv) return;
     if (srv->listen_id) uasync_remove_socket_t(srv->ua, srv->listen_sock);

src/transport_layer/stcp_server.h

@@ -24,6 +24,8 @@ struct stcp_server *stcp_server_create(struct UASYNC *ua, uint16_t port,
                                         stcp_connect_cb connect_cb, void *arg,
                                         stcp_close_cb close_cb, void *close_arg,
                                         int family);
+// Фактический TCP-порт слушателя (port=0 при create выбирает ОС); 0 при ошибке.
+uint16_t stcp_server_get_port(const struct stcp_server *srv);
 void stcp_server_destroy(struct stcp_server *srv);
 
 // Включить REALITY-камуфляж на этом TCP-сервере: перед STCP-хендшейком сервер