Hi Martin,
this is exactly the dissector I want to call, but unfortunately, I cannot set the required context information associated to that frame or paket from within lua.
I found one hint about doing the same from a C decoder here: http://www.wireshark.org/lists/wireshark-dev/201101/msg00255.html
It seems as if I have to set the information for struct mac_lte_info somewhere in pinfo which is not working for me. Is there any lua equivalent for p_add_proto_data?
I tried
pinfo.cols.radioType = 1
which results in
Lua Error: ...Program Files\Wireshark\lua\test.lua:xxx: bad argument #2 to '?' (Columns__newindex: the column name must be a valid column)
The only way I see so far is rewriting the code in C and using p_add_proto_data.
BR,
Florian
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of ext Martin Mathieson
Sent: Tuesday, January 17, 2012 4:35 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Calling MAC-LTE dissctor from lua dissector on the rest of te data
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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