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Wireshark-bugs: [Wireshark-bugs] [Bug 7541] New: FP dissector needs better heuristics

Date: Sun, 29 Jul 2012 18:41:52 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7541

           Summary: FP dissector needs better heuristics
           Product: Wireshark
           Version: SVN
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Dissection engine (libwireshark)
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: mmann78@xxxxxxxxxxxx


Build Information:
Version 1.9.0 (SVN Rev 44125 from /trunk)

Copyright 1998-2012 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+ 2.24.10, with Cairo 1.10.2, with Pango 1.30.0, with
GLib 2.32.2, with WinPcap (4_1_2), with libz 1.2.5, without POSIX capabilities,
without libnl, with SMI 0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python,
with GnuTLS 2.12.18, with Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with
PortAudio V19-devel (built Jul 28 2012), 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 2.12.18, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 30729
--
Using the capture file from bug 2688, I noticed that a few packets were
dissected as FP (packet-umts_fp.c).  However when I click on them, the only
"dissection" is the error message "Can't dissect FP frame because no per-frame
info was attached!".

I think the heuristic dissection should fail if it can't get the per-frame info
necessary.  Presumably this is because an expected conversation didn't actually
happen.

Note that I have "Try heuristic sub-dissectors first" enabled in the UDP
preferences.

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