[Snort-users] ACID Alert Cache Empty

Kevin Brown Kevin.M.Brown at ...1022...
Fri Jul 19 08:25:04 EDT 2002

Sorry, should have been more clear.  I dropped the ACID cache and event
tables from the mysql command prompt (drop table <table name>), then went to
the PHP frontend and it remade the tables from the script that came with
ACID (create_acid_tbls_mysql.sql).  Still no data is being propogated from
the event table (which has continued to grow) to the acid_event table.  I
guess I'll try to find the function in ACID that updates the ACID cache
tables and see if I can run it from the mysql prompt on the server.

-----Original Message-----
From: Imran William Smith
To: Kevin Brown
Cc: Snort-users
Sent: 7/18/02 6:15 PM
Subject: Re: [Snort-users] ACID Alert Cache Empty

The algorithm acid uses is something like
for each sensor
    get highest sid in acid_event table     -> (call it
    for all rows in event where event.sid > acid_event_max_sid
        insert corresponding rows into acid_event
    end for
end for
This all has to happen this way, because MySQL does not handle the
where not exists (subquery) structure, which would mean the whole thing
be done in a single query.
So my guess is some auto-increment problem is stopping the insert
Acid somehow thinks acid_event is already full.  You could try dropping
and recreate the
acid_event table.  That might probably solve it.  Because when you
say 'rebuilding', I presume you mean 'rebuilding' in the frontend,
rather than a 
drop ; create operation.  So you've totally reset the snort schema, but
not the acid
Imran William Smith
Security Products Development
Mimos Bhd, Malaysia

----- Original Message ----- 
From: Kevin  <mailto:Kevin.M.Brown at ...1022...> Brown 
To: 'snort-users at lists.sourceforge.net'
<mailto:'snort-users at lists.sourceforge.net'>  
Sent: Friday, July 19, 2002 12:57 AM
Subject: [Snort-users] ACID Alert Cache Empty

An issue seems to have popped up this week with Snort (1.9-dev from CVS)
and ACID (0.9.6b22). 

MySQL Server setup: 
ACID 0.9.6b22 
MySQL 3.23.51 
Schema 105 
ADODB 2.12 

Last week worked fine.  Snort was logging to the MySQL server and ACID
would properly update the cache with the new events.  This week it is
properly logging to the db, but ACID won't update the cache of events.

What happens (and this has been working for almost a year) is that on
Sunday night the old database is moved to a new folder and a new snort
database (completely empty) is put into place by rerunning the db schema
creation script (create_mysql).

I have tried deleting the ACID cache tables and rebuilding them, but it
still didn't update the chache with the now over 700,000 alerts.  I can
go to the "Cache and Status" page and see that the database has has a
large number of alerts, but it shows 0 for the cached events.  Hit
update alert cache and it adds 0 alerts to the cache.  Repair tables
doesn't seem to do anything, nor does Rebuild Alert Cache from the same

No software has been changed while I was gone. 

Any other suggestions? 

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