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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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8
scripts/base/protocols/rfb/main.zeek
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@ -1,3 +1,5 @@
@load base/protocols/conn/removal-hooks
module RFB;
export {
@ -41,6 +43,9 @@ export {
};
global log_rfb: event(rec: Info);
## RFB finalization hook. Remaining RFB info may get logged when it's called.
global finalize_rfb: Conn::RemovalHook;
}
function friendly_auth_name(auth: count): string
@ -103,6 +108,7 @@ function set_session(c: connection)
info$id = c$id;
c$rfb = info;
Conn::register_removal_hook(c, finalize_rfb);
}
}
@ -151,7 +157,7 @@ event rfb_share_flag(c: connection, flag: bool) &priority=5
c$rfb$share_flag = flag;
}
event connection_state_remove(c: connection) &priority=-5
hook finalize_rfb(c: connection)
{
if ( c?$rfb )
{