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Dissect tcp packet with 0 length

asked 2019-08-21 21:39:17 +0000

Hi,

I'm writing a packet dissector and would like to dissect TCP packets with zero length (ACK only packets). I would like to do this to add additional information to the packet info column. I'm able to do this with other TCP packets with my dissector, but it seems as if the 0 length TCP packets are never passed off to other dissectors. Is this correct? Is there any way I can get those packets passed on to my dissector?

Thanks!

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answered 2019-08-21 22:02:44 +0000

Jaap gravatar image

As a general concept, without further data in the packet no upper layer dissector is called. This means that non-data carrying TCP packets also do not hand off an empty data block to the application layer dissectors.

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Asked: 2019-08-21 21:39:17 +0000

Seen: 25 times

Last updated: Aug 21