From d205c264807b49f773f37a1efeeea86f39637e99 Mon Sep 17 00:00:00 2001
From: Gerhard Tan <gwohau.tan@gmail.com>
Date: Sun, 29 Jan 2023 23:54:40 +0800
Subject: [PATCH] Bugfix: add ipv6 parsing for custom DNS server (#3266)

---
 client/service.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/client/service.go b/client/service.go
index b72fea7..99201f0 100644
--- a/client/service.go
+++ b/client/service.go
@@ -114,8 +114,8 @@ func (svr *Service) Run() error {
 	// set custom DNSServer
 	if svr.cfg.DNSServer != "" {
 		dnsAddr := svr.cfg.DNSServer
-		if !strings.Contains(dnsAddr, ":") {
-			dnsAddr += ":53"
+		if _, _, err := net.SplitHostPort(dnsAddr); err != nil {
+			dnsAddr = net.JoinHostPort(dnsAddr, "53")
 		}
 		// Change default dns server for frpc
 		net.DefaultResolver = &net.Resolver{