Re: Calling MAC-LTE dissctor from lua dissector on the rest of te data

[Martin Mathieson <martin.r.mathieson () googlemail com>]

Hi Florian, see information below.
Martin

On Tue, Jan 17, 2012 at 5:51 AM, Lehmann, Florian (EXT-Other - DE/Ulm) <
florian.lehmann.ext () nsn com> wrote:

> Hi All,
>
> I hope this is the right place to ask as I can't find any helpful
> information.
> I have a simple UDP Protocol, which has a MAC-LTE packet embedded. After
> dissecting my part of the packet, I would like to call the MAC-LTE
> dissector on the rest of the data.
Did you see the existing heuristic dissector?  Is this format suitable for
what you are doing?  See the MAC-LTE wiki page and the link to
packet-mac-lte.h for details.

I also have a change almost ready to submit that breaks the parsing of the
context information out from the heuristic dissector into a separate
function (I have a need to write to a file with a new DLT, where the format
of the frames is just the context header followed by the MAC payload. So I
have a simple dissector that will register with a DLT (or use a "user" one,
parse this header and pass the payload to the "mac-lte" dissector).


> Calling the MAC-LTE dissector like:
>
> local dissector = Dissector.get("mac-lte")
> dissector:call(buffer(macPduDumpDataPos):tvb(), pinfo, subtree)
>
> results in the following error message:
> Can't dissect LTE MAC frame because no per-frame info was attached.
>
> Could anyone point me in the right direction, how to dissect only the
> header information from my custom protocol and to call the MAC-LTE
> dissector afterwards?
>
> I am using Wireshark version 1.5.1-RL30_110407 (SVN Rev 35697 from
> /trunk).
>
> Thanks and BR,
> Florian
>
>
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