From 6ee0baab5615e9c56411572dec8ae5df68651b2a Mon Sep 17 00:00:00 2001
From: Miek Gieben <miek@miek.nl>
Date: Thu, 13 Jun 2013 19:41:37 +0100
Subject: [PATCH] anything escaped in domain name is legal

Allow all character after a \ in a domainname. It's escaped, it's
legal.
---
 TODO.markdown | 1 +
 defaults.go   | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/TODO.markdown b/TODO.markdown
index 9190be3c..2610f71a 100644
--- a/TODO.markdown
+++ b/TODO.markdown
@@ -7,6 +7,7 @@
 * Make compare/split labels faster
 * Ratelimiting?
 * Have infrastructure to keep track of outbound queries and hold some
+* Check if \DDD is properly parsed: text/network/etc.
 
 ## Nice to have
 
diff --git a/defaults.go b/defaults.go
index d4b53388..bb172c8c 100644
--- a/defaults.go
+++ b/defaults.go
@@ -189,7 +189,11 @@ func IsDomainName(s string) (uint8, uint8, bool) { // copied from net package.
 		c = s[i]
 		switch {
 		default:
-			return 0, uint8(l - longer), false
+			// anything escaped is legal
+			if last != '\\' {
+				return 0, uint8(l - longer), false
+			}
+			partlen++
 		case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_' || c == '*' || c == '/':
 			ok = true
 			partlen++