fix elementary format string bugs in log messages

- etcp.c:466: %d→%s for log_name (was printing garbage like -2012603448)
- etcp_connections.c:2235: Server type %d→%s with server_type_str()
- etcp_connections.c:845,1578,1587: type=%d/nat_type=%d→%s with helpers

src/transport_layer/etcp.c

@@ -463,7 +463,7 @@ void etcp_conn_ref_free(struct ETCP_CONN* conn) {
 // Reset connection
 void etcp_conn_reset(struct ETCP_CONN* etcp) {
     // Reset IDs
-    DEBUG_WARN(DEBUG_CATEGORY_ETCP, "Resetting ETCP instance [%d]", etcp->log_name);
+    DEBUG_WARN(DEBUG_CATEGORY_ETCP, "Resetting ETCP instance [%s]", etcp->log_name);
     etcp->next_tx_id = 1;
     etcp->last_rx_id = 0;
     etcp->last_delivered_id = 0;

src/transport_layer/etcp_connections.c

@@ -842,8 +842,8 @@ struct TCP_SOCKET* tcp_socket_add(struct UTUN_INSTANCE* instance, struct CFG_SER
     {   char loc_str[64] = "none", if_str[64] = "none";
         if (ts->local_addr.ss_family) snprintf(loc_str, sizeof(loc_str), "%s", sockaddr_storage_to_str(&ts->local_addr).str);
         if (ts->interface_addr.ss_family) snprintf(if_str, sizeof(if_str), "%s", sockaddr_storage_to_str(&ts->interface_addr).str);
-        DEBUG_INFO(DEBUG_CATEGORY_SOCKET, "tcp_socket_add: %s type=%d sock_id=%u local=%s iface=%s",
-                   ts->name, ts->type, ts->sock_id, loc_str, if_str); }
+        DEBUG_INFO(DEBUG_CATEGORY_SOCKET, "tcp_socket_add: %s type=%s sock_id=%u local=%s iface=%s",
+                   ts->name, server_type_str(ts->type), ts->sock_id, loc_str, if_str); }
     return ts;
 }
 
@@ -1575,8 +1575,8 @@ static int handle_init_response_client(struct ETCP_SOCKET* e_sock, struct ETCP_D
         
         // Update socket NAT address (only if not already verified)
         {
-            DEBUG_INFO(DEBUG_CATEGORY_NAT, "init_resp nat: socket=%s nat_type=%d new_ip=%s new_port=%u",
-                       e_sock->name, e_sock->nat_type,
+            DEBUG_INFO(DEBUG_CATEGORY_NAT, "init_resp nat: socket=%s nat=%s new_ip=%s new_port=%u",
+                       e_sock->name, nat_type_str(e_sock->nat_type),
                        ip_to_str(&new_nat_ip, AF_INET).str, new_nat_port);
             if (e_sock->nat_type < NAT_VERIFIED_UNKNOWN) {
                 struct sockaddr_in* sin = (struct sockaddr_in*)&e_sock->nat_addr;
@@ -1584,8 +1584,8 @@ static int handle_init_response_client(struct ETCP_SOCKET* e_sock, struct ETCP_D
                 sin->sin_addr.s_addr = new_nat_ip;
                 sin->sin_port = htons(new_nat_port);
             } else {
-                DEBUG_INFO(DEBUG_CATEGORY_NAT, "init_resp nat update SKIPPED (already verified): socket=%s nat_type=%d",
-                           e_sock->name, e_sock->nat_type);
+                DEBUG_INFO(DEBUG_CATEGORY_NAT, "init_resp nat update SKIPPED (already verified): socket=%s nat=%s",
+                           e_sock->name, nat_type_str(e_sock->nat_type));
             }
         }
     } else {
@@ -2232,7 +2232,7 @@ int init_sockets(struct UTUN_INSTANCE* instance) {
             if (server->ip.ss_family == AF_INET) {
                 struct in_addr addr;
                 addr.s_addr = default_ip;
-                DEBUG_INFO(DEBUG_CATEGORY_ETCP, "Server %s type %d ip=%s", server->name, server->type, ip_to_str(&addr, AF_INET).str);
+                DEBUG_INFO(DEBUG_CATEGORY_ETCP, "Server %s type=%s ip=%s", server->name, server_type_str(server->type), ip_to_str(&addr, AF_INET).str);
             }
         }
         if (e_sock && have_default_ip6) {