https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6097
Summary: Abis interface not correctly handled in gsmtap
dissector
Product: Wireshark
Version: 1.7.x (Experimental)
Platform: x86
OS/Version: Windows XP
Status: NEW
Severity: Normal
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: lhaessler@xxxxxxxxxxxxxxxxxx
Build Information:
Version 1.7.0-TEST_BUILD_LHA-01 (SVN Rev Unknown from unknown)
Copyright 1998-2011 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 (32-bit) with GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Jul
5 2011), with AirPcap.
Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.2
(packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.
Built using Microsoft Visual C++ 9.0 build 21022
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
In GSMTAP pseudo-header, when type field is set to GSMTAP_TYPE_ABIS the
gsm_a_dtap dissector should be called.
It is not the case, i.e. no GSM specific dissector is called at all; that's
means that GSM Network Access Stratum PDUs (MM,CC,SMS,...) will not be decoded
when being encapsulated in GSMTAP PDUs.
Please find attached a capture file (gsm.pcap) that highlights the bug: when
loading this file with wireshark v1.6.0, at timestamp 00:00:52:480 you will see
that GSMTAP header will be correcly decoded but data payload is not understood
as a gsm_a_dtap packet.(it should be understood as L3 GSM MM Location Updating
Accept message).
When applying the attached patch (GSMTAP_Abis_interface_mgt.patch), packet at
timestamp 00:00:52:480 will be correctly understood as a GSM L3 message.
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