From 166392fe17c4a81a555d79a1d912d89f3ef10451 Mon Sep 17 00:00:00 2001
From: ayanamist <ayanamist@gmail.com>
Date: Tue, 24 Jun 2025 21:44:26 +0800
Subject: [PATCH] chore: sniffer replace domain only if domain is valid (#2122)

---
 component/sniffer/dispatcher.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/component/sniffer/dispatcher.go b/component/sniffer/dispatcher.go
index eaf3401f..1dafcf1f 100644
--- a/component/sniffer/dispatcher.go
+++ b/component/sniffer/dispatcher.go
@@ -6,6 +6,8 @@ import (
 	"net/netip"
 	"time"
 
+	"github.com/metacubex/sing/common/metadata"
+
 	"github.com/metacubex/mihomo/common/lru"
 	N "github.com/metacubex/mihomo/common/net"
 	C "github.com/metacubex/mihomo/constant"
@@ -164,6 +166,9 @@ func replaceDomain(metadata *C.Metadata, host string, overrideDest bool) {
 }
 
 func (sd *Dispatcher) domainCanReplace(host string) bool {
+	if host == "." || !metadata.IsDomainName(host) {
+		return false
+	}
 	for _, matcher := range sd.skipDomain {
 		if matcher.MatchDomain(host) {
 			return false