Wireshark-bugs: [Wireshark-bugs] [Bug 4342] New: wireshark decodes bootp option 2 incorrect
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 21 Dec 2009 05:23:18 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4342

           Summary: wireshark decodes bootp option 2 incorrect
           Product: Wireshark
           Version: 1.2.5
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: hadar@xxxxxx


Created an attachment (id=4077)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=4077)
Bootp option 2

Build Information:
Version 1.2.5 (SVN Rev 31296)

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+ 2.16.2, with GLib 2.20.3, with WinPcap (version unknown),
with libz 1.2.3, without POSIX capabilities, with libpcre 7.0, with SMI 0.4.8,
with c-ares 1.6.0, with Lua 5.1, with GnuTLS 2.8.1, with Gcrypt 1.4.4, with MIT
Kerberos, with GeoIP, with PortAudio V19-devel (built Dec 17 2009), with
AirPcap.

Running on Windows XP Service Pack 2, build 2600, with WinPcap version 4.1.1
(packet.dll version 4.1.0.1753), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.8.1, Gcrypt 1.4.4, without AirPcap.

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.
--
Wireshark is treating the value as 32-bit Unsigned, instead of 32-bit signed.
In the attached file:
frame 1: option 2 = -7200 sec (-2 Hour)
frame 2: option 2 = +7200 sec (+2 Hour)

from RFC 2132 paragraph 3.4 Time Offset

The time offset field specifies the offset of the client's subnet in
   seconds from Coordinated Universal Time (UTC).  The offset is
   expressed as a two's complement 32-bit integer.  A positive offset
   indicates a location east of the zero meridian and a negative offset
   indicates a location west of the zero meridian.

   The code for the time offset option is 2, and its length is 4 octets.

    Code   Len        Time Offset
   +-----+-----+-----+-----+-----+-----+
   |  2  |  4  |  n1 |  n2 |  n3 |  n4 |
   +-----+-----+-----+-----+-----+-----+

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