zeek-dev June 2016

zeek-dev@lists.zeek.org

6 discussions

by Matthias Vallentin

To find the new name for our CBAN project, it probably make sense to brainstorm separately from the existing technical thread. I'd say let's collect some candidates and then create survey to vote on them. Here are some ideas from the existing thread: - brow - broil - broom - bpk - berk - bob - bip Looking forward to hear your ideas. Matthias

5 years, 6 months

[Bro-Dev] [Broker] multi-topic subscriptions

by Matthias Vallentin

If a broker endpoint subscribes to multiple topics, how many messages do you expect to receive? Consider this snippet: context ctx; auto e = ctx.spawn<blocking>(); e.subscribe("/foo"); e.subscribe("/foo/bar"); e.subscribe("/foo/bar/baz"); e.publish("/foo/bar/baz", 4.2); Should the endpoint receive exactly one message or the same message three times? Personally, I think use exactly-once delivery semantics would be most intuitive. Matthias

5 years, 6 months

[Bro-Dev] Bro plugins + broctl plugins?

by Seth Hall

Has any movement been made on the ability to add broctl plugins into bro plugins? I know we talked about it a few times, and it's sort of becoming necessary are more packet source plugins are showing up in the bro-plugins repository. .Seth -- Seth Hall International Computer Science Institute (Bro) because everyone has a network http://www.bro.org/

5 years, 6 months

[Bro-Dev] Per item expiration for tables

by Jan Grashöfer

Hi, I have a few things I am planning to add to the intel-framework. One of them is expiration for intelligence items. To achieve per item expiration in a table there is a little hack that is used in the notice-framework and in the new netcontrol-framework: By setting &create_expire=0 and returning the intended timeout for each item in the corresponding expire_func, one can achieve per item expiration (see e.g. scripts/base/frameworks/netcontrol/catch-and-release.bro). This approach however does not work for &read_expire and &write_expire, because accessing the item resets the expiration timeout based on the &read/write_expire attribute of the table (in this case 0) instead of the value that was previously returned by the expire_func. The following script demonstrates this effect: https://gist.github.com/J-Gras/061983dac59224a03d3bfad4476a1dd9 The straight-forward solution would be to allow each item to hold its own expiration timeout. Talking to Seth about this, we came up with two possible approaches to achieve this: 1) Use the return value of the expire_func to set this value. 2) Use a bif or language feature (e.g. expire 10sec { tbl[idx] }; ) to set this value. I would prefer the second approach, as the intention of the expire_func return value is to provide a delay for a single expiration event. This would e.g. allow to set an individual expire timeout of e.g. 1 hour for a single item. Once the expire_func is called one could set a delay of e.g. 10min. In case the item is accessed, the timeout would be reset to the originally intended 1 hour instead of 10min. What are your opinions on that? Which approach would you prefer or do you think per item expiration is a bad idea in general? Best regards, Jan

5 years, 7 months

[Bro-Dev] Something to think about as we build Bro Package Manager

by Slagell, Adam J

http://arstechnica.com/security/2016/06/college-student-schools-govs-and-mi… ------ Adam J. Slagell Chief Information Security Officer Director, Cybersecurity Division National Center for Supercomputing Applications University of Illinois at Urbana-Champaign www.slagell.info "Under the Illinois Freedom of Information Act (FOIA), any written communication to or from University employees regarding University business is a public record and may be subject to public disclosure."

5 years, 7 months

[Bro-Dev] TYPE_INT declaration

by Jeff Barber

I just stumbled across this in src/bif_type.def. My understanding of the internal BRO type system is a bit fuzzy so I'm not 100% sure this is wrong -- and I can't point to anything that doesn't work -- but it sure doesn't *look* right. // DEFINE_BIF_TYPE(id, bif_type, bro_type, c_type, accessor, constructor) ... DEFINE_BIF_TYPE(TYPE_INT, "int", "int", "bro_int_t", "%s->AsInt()", "new Val(%s, TYPE_BOOL)") Is there some reason why "new Val(%s, TYPE_BOOL)" is correct for the TYPE_INT constructor here? (This is in master branch but has been like this since the beginning of the git repo.) Thanks, Jeff

5 years, 7 months

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zeek-dev June 2016