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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/sip/main.zeek
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@ -4,6 +4,7 @@
@load base/utils/numbers
@load base/utils/files
@load base/protocols/conn/removal-hooks
module SIP;
@ -87,6 +88,9 @@ export {
## Event that can be handled to access the SIP record as it is sent on
## to the logging framework.
global log_sip: event(rec: Info);
## SIP finalization hook. Remaining SIP info may get logged when it's called.
global finalize_sip: Conn::RemovalHook;
}
# Add the sip state tracking fields to the connection record.
@ -126,6 +130,7 @@ function set_state(c: connection, is_request: bool)
{
local s: State;
c$sip_state = s;
Conn::register_removal_hook(c, finalize_sip);
}
if ( is_request )
@ -189,6 +194,7 @@ event sip_header(c: connection, is_request: bool, name: string, value: string) &
{
local s: State;
c$sip_state = s;
Conn::register_removal_hook(c, finalize_sip);
}
if ( is_request ) # from client
@ -289,7 +295,7 @@ event sip_end_entity(c: connection, is_request: bool) &priority = -5
}
}
event connection_state_remove(c: connection) &priority=-5
hook finalize_sip(c: connection)
{
if ( c?$sip_state )
{