From 83bf76dd417c91a4c78b1d30e91e273e95eb21a7 Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Sat, 24 Oct 2026 17:33:32 +0200
Subject: [PATCH] Release borrowed send-hook owners before ETCP link teardown

---
 src/transport_layer/etcp_connections.c | 5 +++++
 src/transport_layer/etcp_connections.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/transport_layer/etcp_connections.c b/src/transport_layer/etcp_connections.c
index 8a55b86d..9ff93bae 100644
--- a/src/transport_layer/etcp_connections.c
+++ b/src/transport_layer/etcp_connections.c
@@ -1089,6 +1089,7 @@ struct ETCP_LINK* etcp_link_new(struct ETCP_CONN* etcp, struct ETCP_SOCKET* conn
     link->link_status = 0;
     link->send_hook = NULL;
     link->send_hook_ctx = NULL;
+    link->send_hook_release = NULL;
 
     // Initialize keepalive timeout from global config
     if (etcp->instance && etcp->instance->config) {
@@ -1238,6 +1239,10 @@ void etcp_link_close(struct ETCP_LINK* link) {
     link->closing = 1;
     struct ETCP_CONN *etcp = link->etcp;
     etcp->callbacks_running++;
+    void (*release_hook)(struct ETCP_LINK*, void*) = link->send_hook_release;
+    void* hook_context = link->send_hook_ctx;
+    link->send_hook = NULL; link->send_hook_ctx = NULL; link->send_hook_release = NULL;
+    if (release_hook) release_hook(link, hook_context);
     int old_state = link->link_state, old_status = link->link_status;
     link->link_status = link->recv_keepalive = link->initialized = 0;
     if (link->rx_timeout_timer) {
diff --git a/src/transport_layer/etcp_connections.h b/src/transport_layer/etcp_connections.h
index 679e372a..abfb444a 100644
--- a/src/transport_layer/etcp_connections.h
+++ b/src/transport_layer/etcp_connections.h
@@ -364,6 +364,7 @@ struct ETCP_LINK {
 
     etcp_udp_send_fn_t send_hook;    // Перехват прямого UDP; NULL = socket_sendto, SOCKS5 имеет приоритет
     void*              send_hook_ctx;
+    void (*send_hook_release)(struct ETCP_LINK*, void*); // Необязательная отвязка ctx при close; три поля очищаются до вызова
 
     struct sockaddr_storage local_bound_addr; // локальный адрес к которому привязан линк (interface_addr на момент создания)
     uint8_t  is_tcp;                 // 1 = TCP транспорт (STCP)