From a6856ebd9b06a7ad65c7cee6ab59bf8a4102e705 Mon Sep 17 00:00:00 2001
From: Larvan2 <78135608+Larvan2@users.noreply.github.com>
Date: Tue, 20 Aug 2024 21:01:09 +0800
Subject: [PATCH] fix redundant WindowsDNS (#1456)

Co-authored-by: ForestL<45709305+forestl18@users.noreply.github.com>
---
 dns/system_windows.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dns/system_windows.go b/dns/system_windows.go
index 47c1ebaa4e..2f4d1b633d 100644
--- a/dns/system_windows.go
+++ b/dns/system_windows.go
@@ -8,6 +8,7 @@ import (
 	"syscall"
 	"unsafe"
 
+	"golang.org/x/exp/slices"
 	"golang.org/x/sys/windows"
 )
 
@@ -40,6 +41,9 @@ func dnsReadConfig() (servers []string, err error) {
 				// Unexpected type.
 				continue
 			}
+			if slices.Contains(servers, ip.String()) {
+				continue
+			}
 			servers = append(servers, ip.String())
 		}
 	}