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Asterix Cat 240 Decode

asked 2019-06-09 10:42:15 +0000

don_rt gravatar image

I searched the Asterix CAT 240 protokol decoding in wireshark. I want to decide whether or not the CAT 240 is based on the captured packages in wireshark. Is this possible? I want to see all necessary fields. Is there built-in support of Wireshark for this work?

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answered 2020-01-09 11:39:36 +0000

grahamb gravatar image

I see what you mean now.

The plugins are for old versions, and I suspect using XML based dissection would be slower than the current built-in dissector.

It would be a difficult decision to replace the current dissector with the XML based one, and would depend on a number of factors including performance, completeness and that the XML based one uses C++.

Personally I would just use available info to extend the current dissector as that's likely to be the least amount of work.

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answered 2019-06-09 16:40:06 +0000

Jaap gravatar image

Unfortunately for you the current Asterix dissector does not support category 240 message dissection. Either no one has created it, or it has not been submitted for inclusion in the repository.

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Which Asterix category messages can be supported in Wireshark ? (i.e: 034, 048 ...etc)

don_rt gravatar imagedon_rt ( 2019-06-09 19:34:14 +0000 )edit

Probably all of them, it's just a matter of adding the code to the dissector. Once someone finds the interest to add it, that may happen. If you can't do it yourself, you can always file an enhancement bug report, preferably with a sample capture file.

Jaap gravatar imageJaap ( 2019-06-10 04:07:31 +0000 )edit

FYI, bug reports are made at the Wireshark Bugzilla.

grahamb gravatar imagegrahamb ( 2019-06-10 16:44:21 +0000 )edit

Hello again. How can I add a dissector ability for received packets? Should I write an custom script ? Can you give an application note or reference code for dissector the received packets?

don_rt gravatar imagedon_rt ( 2019-06-13 17:11:11 +0000 )edit

The code for the existing dissector is here and this is the file to which the code should be added.

Jaap gravatar imageJaap ( 2019-06-13 20:22:39 +0000 )edit

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Asked: 2019-06-09 10:42:15 +0000

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Last updated: Jan 09 '20