Auditing software for Squid

Dear friends: I'm running a Squid proxy server on a SuSE Linux box (6.3) which authenticates users against a NT primary domain controller. I've been asked to get accurate information on proxy usage based on users' ID. I've been trying "calamaris" for this task, but it seems unable to extract any info based on users (each line in the Squid logs includes the name of the user). Any idea of what's happening? Maybe should I use another software? Thanks in advance. -- | * * * * * * * * Marco Antonio Blanco | See the stars, they're shining bright (mablanco@earthling.net) | * Everything's alright tonight * | * * * * - M.L.Gore * *