[Bro] broccoli not processing events

Siwek, Jon jsiwek at illinois.edu
Mon Dec 8 08:56:30 PST 2014

> On Dec 7, 2014, at 11:02 AM, James Feister <openjaf at gmail.com> wrote:
> I am creating an application based on the broccoli test/broconn source.  It seems when running the broconn example and the application I am writing using bro versions 2.0 and 2.1, I can subscribe to "new_connection" events and process them in a callback; everything is great.  But when using bro version 2.3 there is no processing of the events sending them to the callback.  This goes for the broconn example and my app.

The “connection” record in Bro has evolved over time to include data types that Broccoli clients can no longer process (I think it’s “opaque” types that are now problematic, but may be misremembering).  Broccoli silently (unless debug output is turned out) fails to invoke callbacks for events that use those data types.

As a general suggestion, try writing custom Bro events to pick and choose particular things to send to Broccoli clients.  E.g.:

global my_custom_new_connection: event(cid: conn_id);

event new_connection(c: connection)
	event my_custom_new_connection(c$id);

Then have the Broccoli client register a callback for “my_custom_new_connection” instead of “new_connection”.

I think this should workaround the bug in Broccoli as well as be more efficient (unless the Broccoli client actually intended to make use of every last bit of data in the connection record).  Also, the new library being developed to replace Broccoli/Bro communication, called Broker, is planned to require being explicit about the content of remotely communicated messages.  So writing code in this way should make it easier to adapt to the new library when available.

- Jon

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