Release remaining transport subscriptions at instance destruction

src/utun_instance.c

@@ -624,6 +624,23 @@ static void instance_destroy(struct UTUN_INSTANCE* instance, int owns_config) {
     DEBUG_INFO(DEBUG_CATEGORY_SYS, "[INSTANCE_DESTROY] Freeing instance memory");
 
     // Cleanup nodeinfo callback chain
+    while (instance->new_conn_cbks) {
+        struct etcp_inst_cbk_entry* entry = instance->new_conn_cbks;
+        instance->new_conn_cbks = entry->next; u_free(entry);
+    }
+    while (instance->link_status_cbks) {
+        struct etcp_link_status_cbk_entry* entry = instance->link_status_cbks;
+        instance->link_status_cbks = entry->next; u_free(entry);
+    }
+    while (instance->conn_status_cbks) {
+        struct etcp_status_cbk_entry* entry = instance->conn_status_cbks;
+        instance->conn_status_cbks = entry->next; u_free(entry);
+    }
+    while (instance->socket_cbks) {
+        struct etcp_socket_cbk_entry* entry = instance->socket_cbks;
+        instance->socket_cbks = entry->next; u_free(entry);
+    }
+    DEBUG_DEBUG(DEBUG_CATEGORY_SYS, "instance transport subscriptions released");
     while (instance->nodeinfo_cbks) {
         struct nodeinfo_cbk_entry* r = instance->nodeinfo_cbks;
         instance->nodeinfo_cbks = r->next; u_free(r);

tests/test_instance_contract.c

@@ -149,7 +149,7 @@ static void test_reload(struct UASYNC* ua) {
 
 static void test_headless(struct UASYNC* ua) {
     char text[1024];
-    snprintf(text, sizeof(text), "[global]\nmy_private_key=%s\nmy_public_key=%s\nclient_type=server\n"
+    snprintf(text, sizeof(text), "[global]\nmy_private_key=%s\nmy_public_key=%s\nclient_type=0\n"
         "[chatserver]\nheadless_control_bind=127.0.0.1:0\ncall_audio_bind=127.0.0.1:0\nradio_audio_bind=127.0.0.1:0\n",
         private_key, public_key);
     struct UTUN_INSTANCE* inst = utun_instance_create_from_str(ua, text); assert(inst && !utun_core_start(inst));