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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