Wireshark-bugs: [Wireshark-bugs] [Bug 3461] New: GSM DTAP: Incorrect decoding of MS Radio Access
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 13 May 2009 13:39:29 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3461

           Summary: GSM DTAP: Incorrect decoding of MS Radio Access
                    Capability Switch-Measure*
           Product: Wireshark
           Version: 1.0.7
          Platform: x86
        OS/Version: SuSE
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: rspmn@xxxxxxxx


Build Information:
wireshark 1.0.7

Copyright 1998-2009 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+ 2.14.4, with GLib 2.18.2, with libpcap 0.9-PRE-CVS, with
libz
1.2.3, without POSIX capabilities, with libpcre 7.8, without SMI, without ADNS,
with Lua 5.1, with GnuTLS 2.4.1, with Gcrypt 1.4.1, without Kerberos, without
PortAudio, without AirPcap.

Running on Linux 2.6.27.21-0.1-pae, with libpcap version 0.9-PRE-CVS.

Built using gcc 4.3.2 [gcc-4_3-branch revision 141291].

--
Due to a missing offset the Switch-Measure-Switch and Switch-Measure values
are incorrectly displayed e.g. as follows (please refer to the attached pcap
using Decode User DLT 0 as gsm_a_dtap):

            Switch-Measure-Switch value: (7) 7/4 timeslot (~1008 microseconds)
            Switch-Measure value: (1) 1/4 timeslot (~144 microseconds)

The proposed patch below (against SVN revision 28329) fixes the value
displayed according to TS 24.008, section 10.5.5.12a/table 10.5.146:

            Switch-Measure-Switch value: (7) 8/4 timeslot (~1152 microseconds)
            Switch-Measure value: (1) 2/4 timeslot (~288 microseconds)


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