refactor: split socket meta 'type' into config_type and nat_type — separate config (PUBLIC/NAT/PRIVATE) from detected NAT (EIM/STRICT/DIRECT) across NODEINFO, conn_mgr, route_bgp, route_node, etcpmon; win32 compat fixes (memmem, SHUT_WR, tun test_mode, tcp_proxy guards)

src/utun_instance.c

@@ -156,11 +156,14 @@ static int instance_init_common(struct UTUN_INSTANCE* instance, struct UASYNC* u
 
     // TCP proxy server (exit node, optional) — must be before tcp_proxy_client so
     // tcp_proxy_client_create can overwrite the handler if it has remote mappings
+#ifndef _WIN32
     if (tcp_proxy_server_init(instance) != 0) {
         DEBUG_WARN(DEBUG_CATEGORY_SOCKET, "Failed to initialize tcp_proxy_server (non-fatal)");
     }
+#endif
 
     // TCP proxy client (from [tcp_proxy] config section)
+#ifndef _WIN32
     if (config->global.tcp_proxy_client_enabled || config->global.tcp_proxy_client_socks_enabled || config->global.tcp_proxy_client_http_proxy_enabled) {
         const char* tun_name = config->global.tcp_proxy_client_tun_name;
         const char* tun_ip = config->global.tcp_proxy_client_tun_ip;
@@ -183,6 +186,7 @@ static int instance_init_common(struct UTUN_INSTANCE* instance, struct UASYNC* u
     } else {
         instance->tcp_proxy_client = NULL;
     }
+#endif /* _WIN32 */
 
     return 0;
 }
@@ -362,6 +366,7 @@ void utun_instance_destroy(struct UTUN_INSTANCE *instance) {
     }
 
     // Cleanup TCP proxy client module
+#ifndef _WIN32
     if (instance->tcp_proxy_client) {
         DEBUG_INFO(DEBUG_CATEGORY_TUN, "Destroying TCP proxy client module");
         tcp_proxy_client_destroy(instance->tcp_proxy_client);
@@ -370,6 +375,7 @@ void utun_instance_destroy(struct UTUN_INSTANCE *instance) {
 
     // Cleanup TCP proxy server
     tcp_proxy_server_destroy(instance);
+#endif
 
     // Cleanup routing module (unbinds from etcp_router before etcp_router_destroy)
     routing_destroy(instance);