Wireshark-bugs: [Wireshark-bugs] [Bug 1226] New: WireShark displays DCE RPC fragment acknowledge
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 15 Nov 2006 12:44:48 +0000 (GMT)
http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1226

           Summary: WireShark displays DCE RPC fragment acknowledgements
                    (FACK) without a body as malformed
           Product: Wireshark
           Version: 0.99.4
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: benja@xxxxxxxx


Build Information:
Version 0.99.4 (SVN Rev 19757)

Copyright 1998-2006 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+ 2.6.9, with GLib 2.6.6, with WinPcap (version unknown), with
libz 1.2.3, with libpcre 6.4, with Net-SNMP 5.3.1, with ADNS, with Lua 5.1,
with
GnuTLS 1.5.1, with Gcrypt 1.2.3, with MIT Kerberos, with PortAudio <= V18, 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

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
--
WireShark marks DCE RPC FACKs as "malformed" if they do not have a body.
According to DCE RPC Spec. 1.1 FACKs "may contain" a body PTU.

I am unable to build WireShark (lack of time to install all neccessary stuff)
but I looked at the SourceCode. I think, at least this has to be fixed:

file: epan/dissectors/packet-dcerpc.c
function: static gboolean dissect_dcerpc_dg (tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)

*snip*
case PDU_FACK
dissect_dcerpc_dg_fack (tvb, offset, pinfo, dcerpc_tree, &hdr); 
break;
*snap*

I guess, it should look like "case PDU_NOCALL:" directly above.


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