Hi,
I would like to know if adding a new dissector would require modifying/adding
this dissector to the code of the dissector that may later call it.
For example, I was looking at packet-gtp.c, and in proto_re_handoff_gtp(),
dissector_add() was used to add UDP and if neccessary, TCP. Looking at
dissector_add(), it appears that it would call dissector_add_handle() to add
GTP as a sub-dissector to UDP and/or TCP. All of this is done only in
packet-gtp.c and not in packet-udp.c or packet-tcp.c.
If my reasoning is correct, am I right to say when I add a dissector, I need
not modify the codes of the protocol layers below it? For example in this case,
if I were to add the GTP dissector, I only need to specify and add the layers
below it (UDP and/or TCP) in its own code. As for protocol layers above it, I
would just use call_dissector whenever appropriate?
Thank you.
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