From 4a579177833f6cec6014d8894cf985f6689b5f26 Mon Sep 17 00:00:00 2001
From: ALICE <debianbear@gmail.com>
Date: Thu, 22 Dec 2022 13:30:23 +0800
Subject: [PATCH] Chore: skip cache acme challenge dns msg (#2469)

---
 dns/util.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/dns/util.go b/dns/util.go
index df3a3331..05c734e8 100644
--- a/dns/util.go
+++ b/dns/util.go
@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"strings"
 	"time"
 
 	"github.com/Dreamacro/clash/common/cache"
@@ -16,6 +17,12 @@ import (
 )
 
 func putMsgToCache(c *cache.LruCache, key string, msg *D.Msg) {
+	// skip dns cache for acme challenge
+	if q := msg.Question[0]; q.Qtype == D.TypeTXT && strings.HasPrefix(q.Name, "_acme-challenge") {
+		log.Debugln("[DNS] dns cache ignored because of acme challenge for: %s", q.Name)
+		return
+	}
+
 	var ttl uint32
 	switch {
 	case len(msg.Answer) != 0: