Dissector Recognition

[Scott <theerickson () gmail com>]

Devs,

How does Wireshark know which dissector(s) to call while dissecting a
packet?  I've written a dissector for a protocol in development which
consists of a shim inserted into every packet on the network.  Our code
correctly updates checksums and sets IP's "Protocol" field to an identifier
for our protocol.  I am compiling the dissector directly into source instead
of as a plugin.  After compilation the dissector correctly shows up in the
list of dissectors from within Wireshark, but it has yet to correctly
dissect anything in the packet view.

I put printf's into the register and dissect functions to see if they were
really being called, but I don't see the results from that and only half
expected to anyway.
I also thought that maybe Wireshark knows which dissector to call by the
identifier IP lists in the "Protocol" field, but if it does, I don't know
where in my dissector code that ID should go.
I believe I correctly add items to the protocol tree.

I've read most of README.developer up until section 2 (Advanced dissector
topics) so I feel like I've RTM.

Any guidance will be much appreciated,
Scott

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