From: Bob Halley <halley@nominum.com>
Date: Wed, 13 Jul 2011 00:56:56 +0000 (-0700)
Subject: increase IPv4 parsing strictness yet more
X-Git-Tag: v1.10.0~20
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e189940dec42495869483f71b0be119bf8956d60;p=thirdparty%2Fdnspython.git

increase IPv4 parsing strictness yet more
---

diff --git a/dns/ipv4.py b/dns/ipv4.py
index ec7d2d24..e117966e 100644
--- a/dns/ipv4.py
+++ b/dns/ipv4.py
@@ -29,6 +29,12 @@ def inet_aton(text):
     parts = text.split('.')
     if len(parts) != 4:
         raise dns.exception.SyntaxError
+    for part in parts:
+        if not part.isdigit():
+            raise dns.exception.SyntaxError
+        if len(part) > 1 and part[0] == '0':
+            # No leading zeros
+            raise dns.exception.SyntaxError
     try:
         bytes = [int(part) for part in parts]
         return struct.pack('BBBB', *bytes)