Wireshark-bugs: [Wireshark-bugs] [Bug 2968] New: Decoding of ISUP RLC message in M3UA issues mal
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Tue, 14 Oct 2008 13:11:58 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2968

           Summary: Decoding of ISUP RLC message in M3UA issues malformed
                    packet and the rest of the IP packet does not get
                    decoded
           Product: Wireshark
           Version: 1.0.3
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Minor
          Priority: Medium
         Component: Extras
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: dave.pedersen@xxxxxxxxxxx


Created an attachment (id=2361)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=2361)
See description above

Build Information:
Version 1.0.3 (SVN Rev 26134)

Copyright 1998-2008 Gerald Combs <gerald@xxxxxxxxxxxxx> 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 with GTK+ 2.12.8, with GLib 2.14.6, with WinPcap (version unknown),
with libz 1.2.3, without POSIX capabilities, with libpcre 7.0, with SMI 0.4.8,
with ADNS, with Lua 5.1, with GnuTLS 2.3.8, with Gcrypt 1.4.1, with MIT
Kerberos, with PortAudio V19-devel, with AirPcap.

Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.0.2
(packet.dll version 4.0.0.1040), based on libpcap version 0.9.5, without
AirPcap.

Built using Microsoft Visual C++ 6.0 build 8804


--
When decoding M3UA messages a packet containing an ISUP Release Complete
message decodes the RLC correctly then displays a "Malformed Packet" message in
the display. If there are any other SS7 messages in the IP packet, they do not
get decoded. If, however, I have a Reset Circuit message in the packet which is
the same message size and data size (just a different message code) the decoder
decodes it and subsequent messages in the packet correctly. I have attached a
txt file showing the wireshark display output first for the RSC and then for
two RLC messages. The first RLC message is alone in the packet the second one
has an ISUP answer message following that doesn't get decoded.


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