From 7db07630a7fceb8161f00f916070dd1e16949f55 Mon Sep 17 00:00:00 2001
From: adlyq <2833154405@qq.com>
Date: Mon, 2 May 2022 22:24:14 +0800
Subject: [PATCH] fix: DNS mapping error when sniffing result is ip, Discard
 sniffs that result in ip

---
 component/sniffer/dispatcher.go | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/component/sniffer/dispatcher.go b/component/sniffer/dispatcher.go
index 909bccff..41df40ac 100644
--- a/component/sniffer/dispatcher.go
+++ b/component/sniffer/dispatcher.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 	"github.com/Dreamacro/clash/constant/sniffer"
 	"net"
+	"net/netip"
 	"strconv"
 	"time"
 
@@ -94,14 +95,14 @@ func (sd *SnifferDispatcher) Enable() bool {
 func (sd *SnifferDispatcher) sniffDomain(conn *CN.BufferedConn, metadata *C.Metadata) (string, error) {
 	for _, sniffer := range sd.sniffers {
 		if sniffer.SupportNetwork() == C.TCP {
-			conn.SetReadDeadline(time.Now().Add(3 * time.Second))
+			_ = conn.SetReadDeadline(time.Now().Add(3 * time.Second))
 			_, err := conn.Peek(1)
-			conn.SetReadDeadline(time.Time{})
+			_ = conn.SetReadDeadline(time.Time{})
 			if err != nil {
 				_, ok := err.(*net.OpError)
 				if ok {
 					log.Errorln("[Sniffer] [%s] Maybe read timeout, Consider adding skip", metadata.DstIP.String())
-					conn.Close()
+					_ = conn.Close()
 				}
 				log.Errorln("[Sniffer] %v", err)
 				return "", err
@@ -120,6 +121,12 @@ func (sd *SnifferDispatcher) sniffDomain(conn *CN.BufferedConn, metadata *C.Meta
 				continue
 			}
 
+			_, err = netip.ParseAddr(host)
+			if err == nil {
+				log.Debugln("[Sniffer] [%s] Sniff data failed %s", sniffer.Protocol(), metadata.DstIP)
+				continue
+			}
+
 			return host, nil
 		}
 	}