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List:       ethereal-dev
Subject:    Re: [Ethereal-dev] Writing Decoders for Ethereal
From:       Michael Tuexen <Michael.Tuexen () lurchi ! franken ! de>
Date:       2003-04-28 7:35:11
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Hi Sal,

you can also use packet-m3ua.c as an example. ethereal will
handle your data as m3ua if you use that payload protocol identifier
of M3UA or the registered port number for M3UA.

The best way to avoid confusion is to use a not registered payload
protocol identifier for your SCTP traffic. It is a 32 bit integer
and only a few values are used yet.

Best regards
Michael
On Monday, Apr 28, 2003, at 03:10 Europe/Berlin, S. Faizi wrote:

> Michael, Erwin, thank you for your help.
>
> Should I use packet_sua.c as an example or is there a better example 
> (m3ua
> etc) available for my scenario?
>
> Also, since the protocol I am trying to write the dissector for is not 
> a
> standard protocol, the payload of SCTP sometimes ends being 
> interpreted as
> m3ua (per the current display on ethereal 9.11). Will this cause any
> problems?
>
> Best Regards,
> Sal
>
> ----- Original Message -----
> From: "Michael Tuexen" <Michael.Tuexen@lurchi.franken.de>
> To: "Erwin Rol" <erwin@muffin.org>
> Cc: "S. Faizi" <salfaizi@cox.net>; "Ethereal Development"
> <ethereal-dev@ethereal.com>
> Sent: Sunday, April 27, 2003 12:03 PM
> Subject: Re: [Ethereal-dev] Writing Decoders for Ethereal
>
>
>> Just write your dissector and register for
>> - a sctp.ppi and/or sctp.port
>> - a udp.port
>>
>> After doing this your dissector will be called by the SCTp
>> and UDP dissector.
>>
>> Best regards
>> Michael
>>
>> On Sunday, Apr 27, 2003, at 19:18 Europe/Berlin, Erwin Rol wrote:
>>
>>> On Sun, 2003-04-27 at 19:04, S. Faizi wrote:
>>>> Hi,
>>>>
>>>> I am interested in writing a decoder for a proprietary protocol. 
>>>> This
>>>> proprietary protocol is carried by SCTP data chunk, and a few 
>>>> messages
>>>> are carried by UDP. I started by reading "README.developer" file in
>>>> code directory. Since this would be the first time I would be 
>>>> writing
>>>> a decoder for ethereal, I wanted to know if there is a better 
>>>> resource
>>>> available to get me started quickly. Is there an online tutorial 
>>>> etc.
>>>>
>>>
>>> What i did was just take a look at other decoders, the general setup 
>>> is
>>> the same for all of them. And really not that hard, within a few 
>>> hours
>>> you should have a decoder framework in place. For more advanced 
>>> tricks
>>> find a decoder that does what you need and look at its source.
>>>
>>> The source is the best tutorial there is, one of the good things of
>>> OpenSource.
>>>
>>>
>>> - Erwin
>>>
>>>> Regards,
>>>> Sal
>>> -- 
>>>               Dipl.-Ing. Erwin Rol - Software Engineering
>>> tel: +49-(0)8024-479377  gsm: +49-(0)171-6929198 fax:
>>> +49-(0)8024-479379
>>>                         email: erwin@muffin.org
>>> <signature.asc>
>>
>> _______________________________________________
>> Ethereal-dev mailing list
>> Ethereal-dev@ethereal.com
>> http://www.ethereal.com/mailman/listinfo/ethereal-dev
>>
>
>

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