generic network protocols parser ?

[Julian Elischer]

Aziz KEZZOU wrote:

>Hi all,
>I am wondering if any one knows  about a generic parser which takes a
>packet (mbuf) of a certain protocol (e.g RSVP ) as input and generates
>some data structre representing the packet ?
>  
>

you might look at DPF
 (a packet filter/classifier)..
it has an interesting filter description language.

>I've been searching for a while and found that ethereal and tcpdump
>for example use specific data structres and functions to dissect each
>protocol packets. Is this the only approach possible ?
>
>My supervisor suggested using a TLV (Type/Length/Value) approach
>instead. Any opinions about that?
>
>If no such a parser exists is there any practical reason why ?
>
>Thanks,
>Aziz
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