> From: Wireshark-users <wireshark-users-bounces@xxxxxxxxxxxxx> On Behalf Of Ariel Burbaickij
> Sent: Monday, August 30, 2021 4:20 AM
> To: Community support list for Wireshark <wireshark-users@xxxxxxxxxxxxx>
> Subject: [Wireshark-users] any examples of how to hook up Lua dissector to user_dlt tree?
>
> Hello community,
> I would like to write Lua dissector for a binary, i.e. not text, proprietary protocol on top of user_dlt.
> Are there any examples available, which roughly show how this is done ? Could you point me to them
> as I have not found much interesting yet.
>
> In particular, how actual hooking should look like:
>
> local user_dlt = DissectorTable.get("user_dlt") // user_dlt dissector exists in Wireshark
> user_dlt:add(148, my_protocol_to_be_dissected) // my protocol uses user_dlt 148
> or is it something else ?
> Kind Regards
> Ariel Burbaickij
This is done just as for any other protocol, either by changing the Wireshark preferences or specifying the option on the command-line. Assuming "Your Proprietary Protocol" = ypp and DLT=147 ...
1) Changing Wireshark preference: Edit -> Preferences... -> Protocols -> DLT_USER -> Encapsulations Table: Edit... -> [+] -> Select DLT 147, Payload Protocol=ypp, and set other relevant fields as needed -> OK -> OK.
Refs:
https://www.wireshark.org/docs/wsug_html_chunked/ChUserDLTsSection.html
https://gitlab.com/wireshark/wireshark/-/wikis/HowToDissectAnything
2) Command-line option:
Windows: Wireshark.exe -o "uat:user_dlts:\"User 1 (DLT=147)\",\"ypp\",\"0\",\"\",\"0\",\"\""
*nix: wireshark -o 'uat:user_dlts:"User 1 (DLT=147)","ypp","0","","0",""'
Refs:
https://www.wireshark.org/docs/man-pages/wireshark.html
https://www.wireshark.org/docs/wsug_html_chunked/ChCustCommandLine.html
I hope that helps?
- Chris
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