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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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7
scripts/base/protocols/dns/main.zeek
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@ -3,6 +3,7 @@
@load base/utils/queue
@load ./consts
@load base/protocols/conn/removal-hooks
module DNS;
@ -143,6 +144,9 @@ export {
## replies that haven't been matched with a query yet.
pending_replies: PendingMessages &optional;
};
## DNS finalization hook. Remaining DNS info may get logged when it's called.
global finalize_dns: Conn::RemovalHook;
}
@ -233,6 +237,7 @@ hook set_session(c: connection, msg: dns_msg, is_query: bool) &priority=5
{
local state: State;
c$dns_state = state;
Conn::register_removal_hook(c, finalize_dns);
}
if ( is_query )
@ -582,7 +587,7 @@ event dns_rejected(c: connection, msg: dns_msg, query: string, qtype: count, qcl
c$dns$rejected = T;
}
event connection_state_remove(c: connection) &priority=-5
hook finalize_dns(c: connection)
{
if ( ! c?$dns_state )
return;