From 4a4b1bdb83f206474ebd7e952705c4731aea9fc0 Mon Sep 17 00:00:00 2001
From: yaling888 <73897884+yaling888@users.noreply.github.com>
Date: Fri, 25 Mar 2022 04:09:11 +0800
Subject: [PATCH] Chore: adjust tun RelayDnsPacket

---
 listener/tun/ipstack/commons/dns.go | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/listener/tun/ipstack/commons/dns.go b/listener/tun/ipstack/commons/dns.go
index 412dc5b7..667c2642 100644
--- a/listener/tun/ipstack/commons/dns.go
+++ b/listener/tun/ipstack/commons/dns.go
@@ -28,15 +28,9 @@ func RelayDnsPacket(payload []byte) ([]byte, error) {
 
 	r, err := resolver.ServeMsg(msg)
 	if err != nil {
-		return nil, err
-	}
-
-	for _, ans := range r.Answer {
-		header := ans.Header()
-
-		if header.Class == D.ClassINET && (header.Rrtype == D.TypeA || header.Rrtype == D.TypeAAAA) {
-			header.Ttl = 1
-		}
+		m := new(D.Msg)
+		m.SetRcode(msg, D.RcodeServerFailure)
+		return m.Pack()
 	}
 
 	r.SetRcode(msg, r.Rcode)