Hi all, thanks for maintaining this amazing project. I've been using Wireshark for many years and it remains my go-to program for debugging network issues or security problems. :)
I'm currently working on polishing the dissector[1] for the Teeworlds[2]/DDNet[3] protocol. Writing the dissector was only possible due to the nice documentation, README.dissector, README.heuristic, README.plugins were all very nice to read. You can see a somewhat recent example of the dissector in this screenshot[4]. I have two questions: First, Teeworlds packets are usually segmented into smaller chunks, and these chunks can have unparsed data at the end. In the top-level protocol, one could simply return less than tvb_reported_length(tvb) so the remaining bytes show up as "Data", but because the packet is divided in chunks, the unparsed bytes are actually in the middle of the packet. How would one go about marking these bytes? The other thing is that I dynamically generate some parts of the dissector by reading a JSON file[5]. This is due to the fact that Teeworlds has sets of incompatible network messages, so I thought it'd make sense for the user to be able to change this JSON spec file at runtime. I saw other dissectors re-executing the handoff function when the options change, however the field registration happens in the register function. What is the difference between these two functions? Could I just move everything over to the handoff function and re-execute that if the spec file changes? Is it even safe to register new protocol fields at runtime? (I assume you can't delete old ones.) Or would you suggest another approach? Finally, I hope this is the correct place to ask these questions. Is there some chat room where smaller questions could be asked? Kind regards, heinrich5991 [1]: https://github.com/heinrich5991/libtw2/blob/ce1308a8893be257c7f43075536f278e723ac09b/wireshark-dissector/src/lib.rs [2]: https://www.teeworlds.com/ [3]: https://ddnet.tw/ [4]: https://heinrich5991.de/teeworlds/libtw2/random/2021-02-14-dissector.png [5]: https://github.com/heinrich5991/libtw2/blob/ce1308a8893be257c7f43075536f278e723ac09b/gamenet/generate/spec/ddnet-15.2.5.json ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> Archives: https://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe
