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GH-1119: add base/protcols/conn/removal-hooks.zeek

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This adds two new functions: `Conn::register_removal_hook()` and
`Conn::unregister_removal_hook()` for registering a hook function to be
called back during `connection_state_remove`.  The benefit of using hook
callback approach is better scalability: the overhead of unrelated
protocols having to dispatch no-op `connection_state_remove` handlers is
avoided.
This commit is contained in:
Jon Siwek 2020-09-10 21:19:14 -07:00
parent 49e2047da0
commit 05cf511f18
31 changed files with 659 additions and 386 deletions
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11
scripts/base/protocols/radius/main.zeek
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@ -1,9 +1,10 @@
##! Implements base functionality for RADIUS analysis. Generates the radius.log file.
module RADIUS;
@load ./consts
@load base/utils/addrs
@load base/protocols/conn/removal-hooks
module RADIUS;
export {
redef enum Log::ID += { LOG };
@ -48,6 +49,9 @@ export {
## Event that can be handled to access the RADIUS record as it is sent on
## to the logging framework.
global log_radius: event(rec: Info);
## RADIUS finalization hook. Remaining RADIUS info may get logged when it's called.
global finalize_radius: Conn::RemovalHook;
}
redef record connection += {
@ -70,6 +74,7 @@ event radius_message(c: connection, result: RADIUS::Message) &priority=5
c$radius = Info($ts = network_time(),
$uid = c$uid,
$id = c$id);
Conn::register_removal_hook(c, finalize_radius);
}
switch ( RADIUS::msg_types[result$code] )
@ -138,7 +143,7 @@ event radius_message(c: connection, result: RADIUS::Message) &priority=-5
}
}
event connection_state_remove(c: connection) &priority=-5
hook finalize_radius(c: connection)
{
if ( c?$radius && ! c$radius$logged )
{