From 9c73e969ca991c1c231106c279db2f21c49d7d54 Mon Sep 17 00:00:00 2001
From: nadoo <287492+nadoo@users.noreply.github.com>
Date: Mon, 6 Aug 2018 08:13:23 +0800
Subject: [PATCH] dns: return correct err in exchange

---
 dns/client.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dns/client.go b/dns/client.go
index ede53b9..bdf612c 100644
--- a/dns/client.go
+++ b/dns/client.go
@@ -113,9 +113,10 @@ func (c *Client) exchange(qname string, reqBytes []byte, preferTCP bool) (server
 		network = "udp"
 	}
 
+	var rc net.Conn
 	servers := c.GetServers(qname)
 	for _, server = range servers {
-		rc, err := dialer.Dial(network, server)
+		rc, err = dialer.Dial(network, server)
 		// TODO: support timeout setting for different upstream server
 		rc.SetDeadline(time.Now().Add(time.Duration(3) * time.Second))
 		if err != nil {