fix: server mux conn not close

Author: wwqgtxx

go.mod

@@ -25,7 +25,7 @@ require (
 	github.com/metacubex/randv2 v0.2.0
 	github.com/metacubex/restls-client-go v0.1.7
 	github.com/metacubex/sing v0.5.6-0.20250903022707-c9bf6d825f4d
-	github.com/metacubex/sing-mux v0.3.3-0.20250813083925-d7c9aeaeeaac
+	github.com/metacubex/sing-mux v0.3.3
 	github.com/metacubex/sing-quic v0.0.0-20250718154553-1b193bec4cbb
 	github.com/metacubex/sing-shadowsocks v0.2.12
 	github.com/metacubex/sing-shadowsocks2 v0.2.6

go.sum

@@ -119,8 +119,8 @@ github.com/metacubex/restls-client-go v0.1.7/go.mod h1:BN/U52vPw7j8VTSh2vleD/Mnm
 github.com/metacubex/sing v0.5.2/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
 github.com/metacubex/sing v0.5.6-0.20250903022707-c9bf6d825f4d h1:oprae0GgOxsKpEDa8+pF0WMPrUhpKDRJtBWPAxcy3yo=
 github.com/metacubex/sing v0.5.6-0.20250903022707-c9bf6d825f4d/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
-github.com/metacubex/sing-mux v0.3.3-0.20250813083925-d7c9aeaeeaac h1:wDH/Jh/yqWbzPktqJP+Y1cUG8hchcrzKzUxJiSpnaQs=
-github.com/metacubex/sing-mux v0.3.3-0.20250813083925-d7c9aeaeeaac/go.mod h1:3rt1soewn0O6j89GCLmwAQFsq257u0jf2zQSPhTL3Bw=
+github.com/metacubex/sing-mux v0.3.3 h1:oqCbUAJgTLsa71vfo8otW8xIhrDfbc/Y2rmtW34sQjg=
+github.com/metacubex/sing-mux v0.3.3/go.mod h1:3rt1soewn0O6j89GCLmwAQFsq257u0jf2zQSPhTL3Bw=
 github.com/metacubex/sing-quic v0.0.0-20250718154553-1b193bec4cbb h1:U/m3h8lp/j7i8zFgfvScLdZa1/Y8dd74oO7iZaQq80s=
 github.com/metacubex/sing-quic v0.0.0-20250718154553-1b193bec4cbb/go.mod h1:B60FxaPHjR1SeQB0IiLrgwgvKsaoASfOWdiqhLjmMGA=
 github.com/metacubex/sing-shadowsocks v0.2.12 h1:Wqzo8bYXrK5aWqxu/TjlTnYZzAKtKsaFQBdr6IHFaBE=

listener/sing/util.go

@@ -12,11 +12,14 @@ import (
 func (h *ListenerHandler) HandleSocket(target socks5.Addr, conn net.Conn, _additions ...inbound.Addition) {
 	conn, metadata := inbound.NewSocket(target, conn, h.Type, h.Additions...)
 	if h.IsSpecialFqdn(metadata.Host) {
-		_ = h.ParseSpecialFqdn(
+		err := h.ParseSpecialFqdn(
 			WithAdditions(context.Background(), _additions...),
 			conn,
 			ConvertMetadata(metadata),
 		)
+		if err != nil {
+			_ = conn.Close()
+		}
 	} else {
 		inbound.ApplyAdditions(metadata, _additions...)
 		h.Tunnel.HandleTCPConn(conn, metadata)