Re: lua decoder accessing info from layers above

[Fulko Hew <fulko.hew () gmail com>]

On Mon, Oct 12, 2020 at 8:34 PM John Thacker <johnthacker () gmail com> wrote:

> On Mon, Oct 12, 2020, 8:00 PM Fulko Hew <fulko.hew () gmail com> wrote:
>
> > I'm trying to update/improve someone else's decoder written in Lua.
> > It's for a simple UDP (and TCP) based protocol.
> > But I need to be able to get access to the upper layer
> > to be able to decode it easily.
> >
> > Can someone provide an example of how to determine if the higher layer
> > was UDP or TCP?
>
> If all you need to know is whether it was called from TCP or UDP, then a
> typical approach is to create slightly different dissector functions, one
> for TCP and one for UDP (they can then call a common function, setting a
> parameter) and register the TCP dissector with TCP and the UDP dissector
> with UDP.

That was my first alternativeb.com/wireshark/wireshark/-/wikis/protobuf
<https://gitlab.com/wireshark/wireshark/-/wikis/protobuf>

I liked this answer better, so I updated my dissector accordingly,
and it's shorter, cleaner, and more obvious.

-------------

Now the next question is:
Can I submit this Lua based dissector for inclusion in the Wireshark
project, or
should I rewrite it as a 'C' based dissector, and submit that?

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