MAC/IP/Identity correlation through AAA and DHCP

Hi, First, this is in a wired/wireless WPA2/802.1x environment. I'm trying to create a log of who (real world identity) had what MAC and IP when. The plan is to periodically parse the FreeRADIUS AAA logs (identity to MAC mappings) and DHCP lease files (MAC to IP mappings) and correlate them. Before I dive into parsing these, has anyone written these scripts already? Alternatively, will the FreeRADIUS DHCP server do this without any extra work, and is it mature enough for production? I couldn't find any real documentation on it; just the feature page, and it says it only supports static addresses (I need to oversubscribe the address pool, so I can't do static). Thanks, Ben Jencks