Re: GVCP Dissector

[Marc Petit-Huguenin <marc () petit-huguenin org>]

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On 08/17/2011 10:35 AM, Guy Harris wrote:
> On Aug 17, 2011, at 7:58 AM, Joerg Mayer wrote:
>
> > On Tue, Aug 16, 2011 at 11:04:30AM -0700, Mat Gara wrote:
> >
> > > Additionally in the future we want to make this dissector easily
> > > configurable so that hardware providers could add support for dissecting
> > > their custom register reads.  To do this we want to make use of XML
> > > configuration files and hence we would need to make use of an XML parser
> > > in this dissector.
>
> We already have XML configuration files for the DIAMETER and WiMAX ASN
> Control Plane protocols; they use Flex to scan the XML.
>
> > > One xml parser we have been experimenting with is Expat.  What would it
> > > take to integrate Expat support into wireshark?
>
> The first thing it requires is Expat working on all the versions of UN*X on
> which Wireshark works, as well as 32-bit and 64-bit Windows.  Given that
> their home page:
>
> http://expat.sourceforge.net/
>
> speaks of fixes to make it build on "HP-UX, Tru64, Solaris 9", it'll probably
> work on all the UN*Xes in question; they also mention Windows, but don't say
> anything about Win64.
>
> > Does it really make sense to do something like this? Why not add the code
> > directly into Wireshark. For one, interpreting stuff at runtime is bad
> > performance wise,
>
> How much of the work is done at capture-parsing time rather than just being
> done at startup time?
>
> > also it will be nice to have support in Wireshark for as many product
> > specific extensions as possible.
>
> They could contribute XML files to Wireshark.

I think it would be great to have a standard XML parser available in Wireshark -
for my dissector, it would be to parse the XML document that is embedded in the
ConfigUpdate RELOAD message.

I would suggest to look at the VTD-XML[1] parser, which is extremely fast and
compact and so, in my opinion, well suited for the kind of parsing needed by
Wireshark dissectors.


[1] http://vtd-xml.sourceforge.net/

- -- 
Marc Petit-Huguenin
Personal email: marc () petit-huguenin org
Professional email: petithug () acm org
Blog: http://blog.marc.petit-huguenin.org
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