Re: Bypassing the first layer

[Dario Lombardo <lomato () gmail com>]

You can use export_pdu. This is a layer with multiple attributes (see
epan/exported_pdu.h), but the only really needed is the proto_name, that
allows you to directly call a dissector by its name.
You will have frames with this stack: FRAME/EXPORT PDU/RTPS, that is
properly dissected by wireshark.

On Tue, Jan 14, 2020 at 4:33 PM Juanjo Martin Carrascosa <juanjo () rti com>
wrote:

> Hi everyone,
>
> RTPS is a protocol already supported by Wireshark. I have been helping
> maintain that protocol these past years. It sits on top of TCP and UDP, as
> well as some other transports that are not network ones (Shared Memory
> typically with a proprietary implementation).
>
> We are currently working on implementing a new logging mechanism for our
> product, mainly to address the Shared Memory scenario but it can also be
> really useful when RTPS is used on top of network protocols.
>
> Problem: We can log the RTPS layer but we don't have some information in
> our middleware like the Frame or Ethernet information, so we need to make
> it up. This is ugly, so I am trying to avoid that:
>
> How can I register a protocol so it is picked up instead of the Frame
> layer? This is, I want to create a new protocol that detects that the
> information we generate is for that protocol and the Frame protocol is not
> called, but the new protocol I am creating. This new protocol will then
> call the RTPS protocol to dissect the payload I want to display. We are
> planning to also add some information to this custom protocol, that's why I
> want it to be called first.
>
> Note: I just came up with this solution, but if you have a different
> solution for this, please let me know.
>
> Thanks,
> Juanjo Martin
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