Wireshark-bugs: [Wireshark-bugs] [Bug 5734] New: Mask in Lua ProtoField.uint32() does not work a
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 2 Mar 2011 03:10:05 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5734

           Summary: Mask in Lua ProtoField.uint32() does not work as
                    expected
           Product: Wireshark
           Version: 1.5.x (Experimental)
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: ernesto.puerta+wireshark@xxxxxxxxx


Build Information:
Version 1.5.0 (SVN Rev 35637 from /trunk)

Copyright 1998-2011 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+ 2.16.6, with GLib 2.24.2, with WinPcap (version
unknown), with libz 1.2.3, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.8.5, with
Gcrypt 1.4.5, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Jan
24 2011), 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 2.8.5, Gcrypt 1.4.5, 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.
--
In Lua, a declaration as following:
f.id = ProtoField.uint32("proto.id", "ID", base.DEC, nil, 0xF0000000)
[...]
tree:add(f.id, tvb(0,4))

Results in something like that (0x10000000):
0... .... .... .... .... .... .... .... = ID: 0

While the following should be expected (0xF0000000):
0100 .... .... .... .... .... .... .... = ID: 4

It only affects the FIRST byte in uint32 fields, and 8/16/24-bit integer fields
are free of this bug.

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