Wireshark-bugs: [Wireshark-bugs] [Bug 9442] New: DNP3 Bug Fix for Analog Data Sign Bit Handling
| Bug ID |
9442
|
| Summary |
DNP3 Bug Fix for Analog Data Sign Bit Handling
|
| Classification |
Unclassified
|
| Product |
Wireshark
|
| Version |
1.11.x (Experimental)
|
| Hardware |
x86
|
| OS |
Windows 8
|
| Status |
UNCONFIRMED
|
| Severity |
Minor
|
| Priority |
Low
|
| Component |
Dissection engine (libwireshark)
|
| Assignee |
bugzilla-admin@wireshark.org
|
| Reporter |
cbontje@gmail.com
|
Created attachment 12101 [details]
DNP3 Analog Data Sign-Bit-Handling Patch 11-15-2013
Build Information:
Version 1.11.1 (SVN Rev Unknown 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, 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 Nov 14 2013),
with AirPcap.
Running on 64-bit Windows 8, build 9200, with WinPcap version 4.1.3 (packet.dll
version 4.1.0.2980), 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) i7-3687U CPU @ 2.10GHz, with 8074MB of physical
memory.
Built using Microsoft Visual C++ 10.0 build 30319
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
This is a patch file for a fix I've been meaning to submit for around 8 years
or so. :)
The DNP3 protocol document set does specify that certain analog data types are
to be interpreted as signed (with negative values possible). The rules are
roughly as follows:
Analog Input or Output (16 or 32-bit Integer) - range of -32768 -> +32767 or
-2147483648 -> +2147483647
Counter (16 or 32-bit Integer) - Unsigned, 0->65535 or 0->4294967296
This patch corrects handling for Analog Input/Output data when negative values
are returned in messages. Previously, all analog data was handled as unsigned,
therefore negative values were returned as high positive values.
A sample capture is included illustrating analog input data (16 and 32-bit)
with various positive and negative values.
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