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GH-646: add new "successful_connection_remove" event

Browse source 
And switch Zeek's base scripts over to using it in place of
"connection_state_remove".  The difference between the two is
that "connection_state_remove" is raised for all events while
"successful_connection_remove" excludes TCP connections that were never
established (just SYN packets).  There can be performance benefits
to this change for some use-cases.

There's also a new event called ``connection_successful`` and a new
``connection`` record field named "successful" to help indicate this new
property of connections.
This commit is contained in:
Jon Siwek 2019-11-02 11:12:00 -07:00
parent 75588956fc
commit 31f60853c9
48 changed files with 570 additions and 371 deletions
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6
scripts/base/protocols/ftp/main.zeek
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@ -322,7 +322,7 @@ event connection_reused(c: connection) &priority=5
c$ftp_data_reuse = T;
}
event connection_state_remove(c: connection) &priority=-5
event successful_connection_remove(c: connection) &priority=-5
{
if ( c$ftp_data_reuse ) return;
if ( [c$id$resp_h, c$id$resp_p] in ftp_data_expected )
@ -334,8 +334,8 @@ event connection_state_remove(c: connection) &priority=-5
}
}
# Use state remove event to cover connections terminated by RST.
event connection_state_remove(c: connection) &priority=-5
# Use remove event to cover connections terminated by RST.
event successful_connection_remove(c: connection) &priority=-5
{
if ( ! c?$ftp ) return;