Wireshark-bugs: [Wireshark-bugs] [Bug 10700] New: DNS NAPTR RR Replacement Length is incorrect
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 14 Nov 2014 10:49:29 +0000
Bug ID 10700
Summary DNS NAPTR RR Replacement Length is incorrect
Product Wireshark
Version 1.12.1
Hardware x86-64
OS Windows 7
Status UNCONFIRMED
Severity Normal
Priority Low
Component Dissection engine (libwireshark)
Assignee bugzilla-admin@wireshark.org
Reporter boaz.brickner@gmail.com 

Created attachment 13260 [details]
DNS NAPTR RR

Build Information:
Version 1.12.1 (v1.12.1-0-g01b65bf from master-1.12)

Copyright 1998-2014 Gerald Combs <gerald@wireshark.org> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (64-bit) with GTK+ 2.24.23, with Cairo 1.10.2, with Pango 1.34.0, with
GLib 2.38.0, with WinPcap (4_1_3), with libz 1.2.5, with SMI 0.4.8, with c-ares
1.9.1, with Lua 5.2, without Python, with GnuTLS 3.1.22, with Gcrypt 1.6.0,
without Kerberos, with GeoIP, with PortAudio V19-devel (built Sep 16 2014),
with
AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.3 (packet.dll version 4.1.0.2980), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 3.1.22, Gcrypt 1.6.0, without AirPcap.
        Intel(R) Core(TM) i5-3550 CPU @ 3.30GHz, with 16345MB of physical
memory.


Built using Microsoft Visual C++ 10.0 build 40219

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
--
Discovered while working on Pcap.Net (http://pcapdot.net).

In the attached pcap file, there's a single LLMNR packet with 4 Additional RRs.
The second one is NAPTR RR.
It seems the Replacement Length field calculated by Wireshark (which Wireshark
calls "rReplacement Length"), is the length of the first label of the DNS name
in the Replacement, instead of the entire DNS name length.

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