Hi,When parsing uncompressed DNS names the end pointer only must be updated when encountering a compressed label, or after parsing all uncompressed labels. Otherwise parse_rr() will interpret the second uncompressed label as resource record header instead of the bits behind the name terminating NUL byte.
The attached patch addresses that issue. Thank you, Mathias -- Join us at Qt Developer Days 2014 - October 6 - 8 at BCC, Berlin Mathias Hasselmann | mathias.hasselm...@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel. Germany +49-30-521325470, Sweden (HQ) +46-563-540090 KDAB - Qt Experts - Platform-independent software solutions
From ce2bede8c2de445e99262bb66b9effedbf186ced Mon Sep 17 00:00:00 2001 From: Mathias Hasselmann <mathias.hasselm...@kdab.com> Date: Wed, 6 Aug 2014 21:47:37 +0200 Subject: [PATCH] Properly parse uncompressed DNS names When parsing uncompressed DNS names the end pointer only must be updated when encountering a compressed label, or after parsing all uncompressed labels. Otherwise parse_rr() will interpret the second uncompressed label as resource record header instead of the bits behind the name terminating NUL byte. --- src/dnsproxy.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/src/dnsproxy.c b/src/dnsproxy.c index 7232b98..2de8bdc 100644 --- a/src/dnsproxy.c +++ b/src/dnsproxy.c @@ -880,14 +880,14 @@ static int get_name(int counter, p += label_len + 1; - if (!*end) - *end = p; - if (p >= max) return -ENOBUFS; } } + if (!*end) + *end = p + 1; + return 0; } -- 1.9.1
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