[Bro] Hooking into source/destination heuristic

Jim Mellander jmellander at lbl.gov
Tue Jan 3 09:09:36 PST 2012


Happy New Year, all!

I have a situation where Bro misidentifies the source and destination
of some connections - this occurs during packet loss situations, where
the SYN and SYN/ACK packets are not seen by Bro.  Is there a way to
hook into the heuristic for establishing the source/destination of the
connection, so that we can employ local site knowledge of the
connection in order to accurately characterize the connection
(hopefully at the scripting level)?  Can I hook into the
connection_established event, and switch source/destination in the
connection record, or are bad things likely to happen as a
consequence?

Thanks in advance,

Jim Mellander
NERSC Cybersecurity
510-486-7204


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