Hi Valentin,
I already developped 2 wireshark plugins (dll) to dissect AFDX payloads
included in A380 CMS messages (System Identification Data and Normal
Mode) .These 2 plugins are below UDP (like any other AFDX payload) and
I use the UDP port number (constant for SID and NM) to call the
function dissector_add. Of course, I agree that you should look to the
VL number which is in the destination MAC address. But, to simplify
your plugin, (as I did), you could do in the same way I did based on
the UDP port.
Regards.
Pascal
valentin.ecker@xxxxxxxxxx a écrit :
Hi all,
I would like to write a new
dissector
for wireshark...but im stuck at some points:
My protocol is based on the ARINC
AFDX
standard which is (more or less) based on Ethernet II frames at layer
2.
The difference to this frame type is the MAC-Dest/Source-Address, where
a certain address space is defined in advance to recognize the AFDX
frames.
This ensures that any COTS ethernet controller can ignore such type of
frames, but special devices (such as switches and controllers)
recognize
them. Anyway...i think any other protocol details would go to far....
My Problem is the following now:
I have to inspect the MAC addresses
and - if a special address is given - foreward them to my own dissector
which dissects further layers. The most obvious thing for me would be
to
modify the "packet-eth" and branch off there for the next layers
(as it is already done with the Cisco ISL frames).
What do you think?
Unfortunately i would prefer a
plugin
dll instead of compiling the whole source. I think i would have to
exchange
the whole eth-dissector with my own one residing in the plugin
directory...would
that be possible, or is there a better solution?
Another problem is, that the address
space is defined by a configuration file (an XML File), and must be
read
at least at every startup of wireshark. Where do you think would be a
nice
place in the wireshark directory for such a file to be read? I was
thinking
of: "Read file if there is one, otherwise handle AFDX Frames like
Ethernet 2 ones".
Thanks a lot for your help!
Valentin
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