Wireshark-bugs: [Wireshark-bugs] [Bug 9001] New: Modbus dissection improvements & misc bug fixes
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 01 Aug 2013 17:06:14 +0000
Bug ID 9001
Summary Modbus dissection improvements & misc bug fixes.
Classification Unclassified
Product Wireshark
Version 1.9.x (Experimental)
Hardware x86
OS Windows 7
Status UNCONFIRMED
Severity Enhancement
Priority Low
Component Dissection engine (libwireshark)
Assignee bugzilla-admin@wireshark.org
Reporter cbontje@gmail.com 

Created attachment 11312 [details]
packet-mbtcp.c Modbus RTU dissection improvements

Build Information:
Version 1.11.0 (SVN Rev 51079 from unknown)

Copyright 1998-2013 Gerald Combs <gerald@wireshark.org> 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+ 3.4.4, with Cairo 1.10.2, with Pango 1.30.1, with
GLib 2.32.4, with WinPcap (4_1_3), with libz 1.2.5, without POSIX capabilities,
without libnl, with SMI 0.4.8, with c-ares 1.9.1, 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 Aug  1 2013), with AirPcap.

Running on 32-bit Windows 7 Service Pack 1, build 7601, 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.
Intel(R) Core(TM) i5 CPU       M 560  @ 2.67GHz, with 3509MB of physical
memory.


Built using Microsoft Visual C++ 9.0 build 30729

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

Check the man page and http://www.wireshark.org for more information.
--
Some small improvements to the Modbus Dissector:
- Better detection of query/response w/ serial line Modbus RTU
- Smallest Modbus RTU message can actually be 6 bytes, not 8.
- Only check 16/32-bit register decoding options with appropriate function
codes

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