Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 1538] New: GSM_MAP dissector decodes user-level SEGMENTED MAPv3 SendRoutingInf

[bugzilla-daemon@xxxxxxxxxxxxx]

http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1538

           Summary: GSM_MAP dissector decodes user-level SEGMENTED MAPv3
                    SendRoutingInfo incorrectly
           Product: Wireshark
           Version: 0.99.5
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Major
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: igor.lobiv@xxxxxxxxx


Build Information:
wireshark 0.99.5 (SVN Rev 20677)

Copyright 1998-2007 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+ 2.10.7, with GLib 2.12.7, with WinPcap (version unknown),
with libz 1.2.3, with libpcre 6.4, with Net-SNMP 5.4, with ADNS, with Lua 5.1,
with GnuTLS 1.6.1, with Gcrypt 1.2.3, with MIT Kerberos, with PortAudio
PortAudio V19-devel, with AirPcap.

Running on Windows XP Service Pack 2, build 2600, with WinPcap version 3.1
(packet.dll version 3, 1, 0, 27), based on libpcap version 0.9[.x], without
AirPcap.

Built using Microsoft Visual C++ 6.0 build 8804
--
The maximum size of SCCP.UDT message is the operator specific. 
For some practical reasons most vendors have max SCCP.UDT size limit 250 - 300
bytes.
If message size exceeds the limit, next possibility is used:
1. Segmentation on SCCP level
    - send one UDT as a number of (segmented) XUDT (eXtended UDT)
    - use LUDT (Long UDT)
2. Segmentation on TCAP-User Level, 
   example: one TC_CONTINUE with embeded one big TC_LAST_RESULT divides to 
   number of TC_CONTINUE with embeded small TC_NOT_LAST_RESULT

In the bug report I use "Segmentation on TCAP-User Level". 
The SendRoutingInfo (in this log) logically is divided to the
   - T-CSI (Terimating-CSI) and other info (IMSI, Subscriber info) 
   - O-CSI (Originating-Camel-Subscription-Info)
   - O-CSI Criteria

in the SRI_MAPSegmented_Textronix_K1297.txt you can see the same log
which is decoded by other tool.

text2pcap.txt - this log in format for text2pcap tool
use: text2pcap.exe -l 140 -o hex -t %H:%M:%S. text2pcap.txt 1111.pcap 

1111.pcap - wireshark log


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