Re: Reassembling IPP info through USB

[Guy Harris <gharris () sonic net>]

On Jul 8, 2020, at 6:06 PM, Jamie Hare <jamie.n.hare () gmail com> wrote:

> I am attempting to create a dissector for IPP over USB and am running into some issues with the reassembly. I first 
> thought that I could just use a reassembly table but with the way the dissectors are run multiple times is it 
> necessary to create a PDU/tap combo like TCP or UDP?

Taps are not used for reassembly of PDUs that cover multiple TCP segments or multiple UDP datagrams, so taps are not 
necessary for reassembly of IPP-over-USB.

You *do* need to make sure that, in the first pass over the packets, the results of the reassembly are saved, just as 
happens with reassembly with other packets, so that, when packets are looked at, in a possibly random order, after the 
first pass, it can be determined where the packet in question resides within the reassembled IPP message.
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