Fix: traces and null checks in etcp_send to debug/prevent core dump; better routing logs with dst

src/etcp_api.c

@@ -101,40 +101,31 @@ int etcp_unbind(struct UTUN_INSTANCE* inst, uint8_t id) {
 }
 
 int etcp_send(struct ETCP_CONN* conn, struct ll_entry* entry) {
+    DEBUG_TRACE(DEBUG_CATEGORY_ETCP_API, "etcp_send enter conn=%p entry=%p", conn, entry);
     if (!conn) {
         DEBUG_ERROR(DEBUG_CATEGORY_ETCP_API, "etcp_send: NULL connection");
         return -1;
     }
-    
     if (!entry) {
         DEBUG_ERROR(DEBUG_CATEGORY_ETCP_API, "etcp_send: NULL entry");
         return -1;
     }
-    
     if (!conn->normalizer) {
         DEBUG_ERROR(DEBUG_CATEGORY_ETCP_API, "etcp_send: Connection has no normalizer");
         return -1;
     }
-    
     struct PKTNORM* pn = conn->normalizer;
-    
-    if (!pn->input) {
-        DEBUG_ERROR(DEBUG_CATEGORY_ETCP_API, "etcp_send: Normalizer has no input queue");
+    if (!pn || !pn->input) {
+        DEBUG_ERROR(DEBUG_CATEGORY_ETCP_API, "etcp_send: pn=%p or input null", pn);
         return -1;
     }
-    
-    // Помещаем entry в очередь input normalizer
-    // queue_data_put забирает ownership entry
-//    DEBUG_TRACE(DEBUG_CATEGORY_NORMALIZER, "Before put to input");
     int result = queue_data_put(pn->input, entry);
-    DEBUG_TRACE(DEBUG_CATEGORY_NORMALIZER, "After put to input");
-    
+    DEBUG_TRACE(DEBUG_CATEGORY_NORMALIZER, "etcp_send after put result=%d", result);
     if (result != 0) {
-        DEBUG_WARN(DEBUG_CATEGORY_ETCP_API, "etcp_send: queue_data_put failed (queue full?)");
+        DEBUG_WARN(DEBUG_CATEGORY_ETCP_API, "etcp_send: queue_data_put failed");
         return -1;
     }
-    
-    DEBUG_DEBUG(DEBUG_CATEGORY_ETCP_API, "etcp_send: Packet queued for sending to [%s]", conn->log_name);
+    DEBUG_DEBUG(DEBUG_CATEGORY_ETCP_API, "etcp_send: queued to [%s]", conn->log_name);
     return 0;
 }