Squid
From Mike Beane's Blog
I'm looking for Squid log analyzers that allow categorization and grouping of sites, so far I've found nothing.
I want to be able to group sites such as *.facebook.com, *.fbcn.com, *.zynga*, etc under a Group and/or place each site under 'Social Sites'. Right now it is hard to look at squid log outputs such as SARG and get a real feel for where the traffic has headed when sub-content servers are in the background providing feeds.
May re-purpose a perl parser and look at adding this sort of granularity.
Check:
> sudo tail -f /var/log/squid/access.log | grep DENIED