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List:       wireshark-dev
Subject:    Re: [Wireshark-dev] Input plugin for PEAK Systems CAN interfaces
From:       Miklos Marton <martonmiklosqdev () gmail ! com>
Date:       2021-03-27 22:04:36
Message-ID: 5abe4af1-86ed-3525-e330-e1049462865f () gmail ! com
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> Hi Miklos,
>
> About 2 years ago I created a plugin to capture CAN packets in windows 
> from a device called AnaGate CAN. This AnaGate CAN unit uses a tcp/ip 
> connection to communicate with another computer and of course its own 
> protocol. You can probably find some emails from me about this topic 
> here in the mailing list.
>
> It also took a fairly long time to find out how the extcap plugins 
> work (no descent/commented examples present) and rudimentary error 
> handling is missing in the wireshark extcap interface towards the 
> wireshark framework. I still need to address that in the mailing list. 
> It was a fairly long time ago so it could have changed in the meanwhile.
>
> This extcap plugin I made was written with a lot of comments and uses 
> (as far as I know) the best practices how to use the interface, the 
> purpose was to give it back to the community as a well documented 
> example for other starters so they don't spoil there precious time. 
> This plugin also has a user interface where you can configure 
> parameters, so this can be a good starting point for you.
>
> A had   to reverse engineer the right calls to use, because none of the 
> existing plugins do things a similar way (different ordering, missing 
> things in some existing extcap plugins etc.) and it was totally 
> unclear to me which calls are best to be used. Also how to integrate 
> the sources into the build system were not (completely) documented.
>
> The plugin does work, but error handling is missing because of lacking 
> support in the wireshark framework and if something goes wrong you 
> need to kill the sub process or wait for a timeout. I cannot fix that 
> in the plugin itself. Another thing I need to check/implement if it 
> can be made more efficient by using poll()/select() in the loop code.
>
> Also I need to test in under Linux, the code is aware of it but never 
> tested.
>
> I need to dig-up the code and port it to the latest version, the 
> previous version I used was wireshark 2.9.1.
>
> The PCAN-USB does it the a serial device class on USB or some 
> proprietary protocol?
>
> regards,
>
> Henri
>
>
Hello Henri,

Thank you very much for your anwer, I would deeply appericiate if you 
could share me that code (in any shape) with me.

> The PCAN-USB does it the a serial device class on USB or some 
> proprietary protocol?
At USB level it uses a proprietary protocol, however PEAK supply a DLL 
for the Windows platform which operates at the CAN network level.

-- 
Best regards,
Miklos Marton

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