From: Kees Monshouwer <mind04@monshouwer.org>
Date: Tue, 28 Nov 2017 20:42:22 +0000 (+0100)
Subject: escaping unusual DNS label octets in DNSName is off by one
X-Git-Tag: dnsdist-1.3.0~161^2~1
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=568556f8efca322a92a87b4bdc03c6af1a75a8f6;p=pdns

escaping unusual DNS label octets in DNSName is off by one
https://tools.ietf.org/html/rfc4343#section-2.1
---

diff --git a/pdns/dnsname.cc b/pdns/dnsname.cc
index c9dee7770..ecfda97be 100644
--- a/pdns/dnsname.cc
+++ b/pdns/dnsname.cc
@@ -423,7 +423,7 @@ string DNSName::escapeLabel(const std::string& label)
       ret+="\\.";
     else if(p=='\\')
       ret+="\\\\";
-    else if(p > 0x21 && p < 0x7e)
+    else if(p > 0x20 && p < 0x7f)
       ret.append(1, (char)p);
     else {
       ret+="\\" + (boost::format("%03d") % (unsigned int)p).str();