From 205b4efac7756abb85cb66bb11a8527534027eb9 Mon Sep 17 00:00:00 2001
From: nadoo <287492+nadoo@users.noreply.github.com>
Date: Tue, 14 Aug 2018 22:32:55 +0800
Subject: [PATCH] dns: use Direct dialer when dialer's domain equals to the
 query domain

---
 dns/client.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dns/client.go b/dns/client.go
index 5b2694a..690e0bb 100644
--- a/dns/client.go
+++ b/dns/client.go
@@ -127,6 +127,11 @@ func (c *Client) exchange(qname string, reqBytes []byte, preferTCP bool) (server
 	network = "tcp"
 	dialer := c.dialer.NextDialer(qname + ":53")
 
+	// if we are resolving the dialer's domain, then use Direct to avoid denpency loop
+	if strings.Contains(dialer.Addr(), qname) {
+		dialer = proxy.Direct
+	}
+
 	// If client uses udp and no forwarders specified, use udp
 	if !preferTCP && dialer.Addr() == "DIRECT" {
 		network = "udp"