Wireshark · Ethereal-dev: Re: [Ethereal-dev] dissectors looking into lower layers

["packet steve" <packetsteve@xxxxxxxxxxx>]

Assume an hypothetical protocol that uses two UDP ports.  The protocol used 
on the two ports is quite similar, but the dissector needs to print a 
port-dependent identification string.   Without peeking into the private 
structure, one could define two dissectors:
  dissector_add("udp.port", PORT1, handle1);
  dissector_add("udp.port", PORT2, handle2);
the two dissectors are basically wrappers would call a common dissector 
carrying along an extra argument ", int udpportnum)".   This isn't very 
elegant.    It also doesn't work for other types of layer-specific data.







> > Is there a preferred way for a dissector to grab information from a 
> lower
> > protocol layer?
.... Good stuff removed.  Thanks Guy.
> What are you trying to do that you need information from the other
> dissector?  There may already be a way of doing that with existing
> mechanisms.
>
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