Wireshark-bugs: [Wireshark-bugs] [Bug 8515] Global variables in X.400 P1 dissector considered ha

Date: Mon, 17 Jun 2013 18:53:40 +0000

changed bug 8515

What Removed Added
CC   [email protected]

Comment # 4 on bug 8515 from
(In reply to comment #3)
> Created attachment 11002 [details]
> Remove p1 global variables
> 
> The attached patch removes all global varibles from the P1 dissector.  It
> appears that all had "at most" a packet scope.  Those that had "packet
> scope", I used p_get_proto_data() to keep the data.  Those that had
> "sequence scope" (consecutive fields in a packet that needed to relay their
> information), I used the value_ptr.
> Not sure of the performance ramifications off all of the p_get_proto_data()
> calls, but it seemed the most "complete" solution.  Some of the
> p_get_proto_data calls could be replaced by assigning the data to
> _asn1_ctx_t->private_data, if for instance, they had "sequence scope".  I'll
> leave that to those more familiar with the dissector.

Performance of p_get_proto_data() gets worse with the number of protocols using
it in a frame. For the usual 5-10 protocols per frame it should be more than
fast enough.

> As a side note, I used x400-ping-refuse.pcap in my testing, and it has
> drastically different dissection results using "default" preferences between
> 1.8.x, 1.10.x, and the SVN.  I reverted my changes on the SVN because I
> thought I has really messed something up, but even without my changes, the
> protocols detected vary per version.

That's odd - the files don't seem to have changed that much since 1.10...


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