enh(rpc): validate fqdn

source/libs/transport/src/trans.c

@@ -51,6 +51,7 @@ void* rpcOpen(const SRpcInit* pInit) {
     ip = taosGetIpv4FromFqdn(pInit->localFqdn);
     if (ip == 0xFFFFFFFF) {
       tError("invalid fqdn: %s", pInit->localFqdn);
+      terrno = TSDB_CODE_RPC_FQDN_ERROR;
       taosMemoryFree(pRpc);
       return NULL;
     }

source/libs/transport/src/transSrv.c

@@ -841,7 +841,7 @@ void* transInitServer(uint32_t ip, uint32_t port, char* label, int numOfThreads,
     }
   }
   if (false == taosValidIpAndPort(srv->ip, srv->port)) {
-    tError("failed to bind, reason: %s", strerror(errno));
+    tError("failed to bind, reason: %s", terrstr());
     goto End;
   }
   if (false == addHandleToAcceptloop(srv)) {

tools/shell/src/shellNettest.c

@@ -127,7 +127,7 @@ static void shellWorkAsServer() {
 
   void *serverRpc = rpcOpen(&rpcInit);
   if (serverRpc == NULL) {
-    printf("failed to init net test server since %s", terrstr());
+    printf("failed to init net test server since %s\n", terrstr());
   } else {
     printf("network test server is initialized, port:%u\n", pArgs->port);
     taosSetSignal(SIGTERM, shellNettestHandler);