Wireshark-dev: Re: [Wireshark-dev] Duplicate dissectors error
From: Juan Jose Martin Carrascosa <[email protected]>
Date: Mon, 29 Aug 2016 17:54:07 -0700
Hi Guy,

Thanks for your answer. What I meant regarding the logging API is to use something that can be disabled changing the verbosity of Wireshark. I've seen that previously.

The plugins are added using dissector_add_string() to the rtps.type_name table. What is the side effect of adding duplicated protocols? Just issues with "decode as"? If that is the only side effect, I can live with it.

Let me know if I can provide more information.

Thanks,
Juanjo Martin

On Mon, Aug 29, 2016 at 5:31 PM, Guy Harris <[email protected]> wrote:
On Aug 29, 2016, at 3:59 PM, Juan Jose Martin Carrascosa <[email protected]> wrote:

> Hi everybody,
>
> I am adding plugins to my Wireshark installation, so they register themselves in the table rtps.type_name (created in packet-rtps.c).
>
> Duplicate dissectors (null) and (null) for protocol Custom in dissector table rtps.type_name
> Duplicate dissectors (null) and (null) for protocol Custom_A in dissector table rtps.type_name
> Duplicate dissectors (null) and (null) for protocol Custom_A in dissector table rtps.type_name
> Duplicate dissectors (null) and (null) for protocol Custom_A in dissector table rtps.type_name
> Duplicate dissectors (null) and (null) for protocol (none) in dissector table rtps.type_name
>
> That error message comes from dissector_add_for_decode_as(). Actually, I don't expect my dissectors to be called from decode_as...
>
> Few things:
>
> 1) This message is printed to stderr instead of using any Logging API. Should we change that?

Well, that would first involve having a logging API to use.

For command-line based programs such as TShark, it would print them to stderr; for Wireshark, it could put them in an "error console" window that the user could pop up.  (On some OSes, output to stderr from GUI programs shows up in a log window, but that's not guaranteed.)

> 2) Which is the right way to design this so I don't get those errors? I could change the value DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE to DISSECTOR_TABLE_ALLOW_DUPLICATE when I create the rtps.type_name table but I'd prefer to solve the issue instead of patching it.

So what's the code that's registering your plugins (the reg_handoff routines for them)?
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Juanjo Martin
Senior Application Engineer
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