Wireshark-bugs: [Wireshark-bugs] [Bug 7393] ISO8073 COTP protocol - ED-TPDU data part not decode
Comment # 8
on bug 7393
from Pascal Quantin
(In reply to comment #7)
> (In reply to comment #1)
> > After a quick look at the source code, no dissector is registered for the ED
> > TPDU data part => adjusting the bug summary accordingly.
>
> I'm not a programmer, but I have read up a bit of how the dissectors are
> supposed to work.
> Your comment regarding a specific dissector surprised me, as I would have
> expected any data parts, independent of the OSI Transport PDU type where
> they occurred, to be passed to the next higher level dissector that has
> registered itself to the cotp dissector list, in this case the OSI Session
> dissector packet-ses.c. Am I missing something ?
So as to be able to identify what the next higher level dissector is, the
dissector must be able to identify which data should be forwarded, and to which
dissector (either heuristically or by an identifier allowing to exactly
identify what the higher level protocol is). This is not currently done for
ED-TPDU, as seen in packet-ositp.c function ositp_decode_ED(): it
systematically send the payload to the data dissector, with a comment
indicating that something is missing:
/*
* XXX - hand this to subdissectors but tell them that this is
* in an ED packet?
*/
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