Wireshark-dev: Re: [Wireshark-dev] Can a Lua dissector access Wireshark preferences?
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From: David Aldrich <[email protected]>
Date: Fri, 31 Aug 2018 14:06:39 +0100
Thanks for your help.

On Thu, Aug 30, 2018 at 6:39 PM Jeff Morriss <[email protected]> wrote:
For the preference side of it see:

On Thu, Aug 30, 2018 at 12:43 PM Maynard, Chris <[email protected]> wrote:

If you look at the documentation for ProtoField.new and friends[1], you can see that there’s a “mask” argument.  That specifies how many bits applies to this field.


So for example, below there are 2 fields, field1 is the upper nibble of a byte, field2 is the lower nibble of a byte:


local foo_field1 = ProtoField.uint8("foo.field1", "Field1", base.DEC, nil, 0xf0)

local foo_field2 = ProtoField.uint8("foo.field2", "Field2", base.DEC, nil, 0x0f)


- Chris


[1]: https://www.wireshark.org/docs/wsdg_html_chunked/lua_module_Proto.html#lua_class_ProtoField



From: Wireshark-dev [mailto:[email protected]] On Behalf Of David Aldrich
Sent: Thursday, August 30, 2018 11:51 AM
To: [email protected]
Subject: [Wireshark-dev] Can a Lua dissector access Wireshark preferences?




For my lua dissector, I want to be able to specify the bit width of a data field using a Wireshark Preference.


Is that possible?  If so, where would I find some help on how to do it?


Best regards



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