Wireshark-users: Re: [Wireshark-users] Calling MAC-LTE dissctor from lua dissector on the rest of
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From: Martin Mathieson <martin.r.mathieson@xxxxxxxxxxxxxx>
Date: Tue, 17 Jan 2012 10:35:03 -0500
Hi Florian, see information below.
Martin

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