From 26a87f9d34d05bc16d7f1c2026d8957768d67c78 Mon Sep 17 00:00:00 2001
From: Dreamacro <305009791@qq.com>
Date: Mon, 11 Feb 2019 17:20:42 +0800
Subject: [PATCH] Fix: `redir-host` mode crash

---
 tunnel/tunnel.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tunnel/tunnel.go b/tunnel/tunnel.go
index 2663ca31..77e81058 100644
--- a/tunnel/tunnel.go
+++ b/tunnel/tunnel.go
@@ -107,15 +107,15 @@ func (t *Tunnel) resolveIP(host string) (net.IP, error) {
 	return t.resolver.ResolveIP(host)
 }
 
-func (t *Tunnel) needLookupIP() bool {
-	return t.hasResolver() && t.resolver.IsMapping()
+func (t *Tunnel) needLookupIP(metadata *C.Metadata) bool {
+	return t.hasResolver() && t.resolver.IsMapping() && metadata.Host == "" && metadata.IP != nil
 }
 
 func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
 	defer localConn.Close()
 	metadata := localConn.Metadata()
 
-	if t.needLookupIP() {
+	if t.needLookupIP(metadata) {
 		host, exist := t.resolver.IPToHost(*metadata.IP)
 		if exist {
 			metadata.Host = host