From c13d4ee9cdfa521fc0e297cc608e4e3133322ffa Mon Sep 17 00:00:00 2001
From: Miek Gieben <miek@miek.nl>
Date: Mon, 27 Jul 2015 20:48:09 +0100
Subject: [PATCH] domain names: fix compression of root-label

If the root label is compressed (which is 2 bytes, the root label
itself is only 1 byte, so why do it?), go dns incorrectly set the
offset when encountering such a name.

Fixes #234
---
 msg.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/msg.go b/msg.go
index 34896a75c..9fb893574 100644
--- a/msg.go
+++ b/msg.go
@@ -414,7 +414,10 @@ Loop:
 			if c == 0x00 {
 				// end of name
 				if len(s) == 0 {
-					return ".", off, nil
+					if ptr == 0 {
+						off1 = off
+					}
+					return ".", off1, nil
 				}
 				break Loop
 			}