Freeradius updating /etc/hosts?

Ive been using freeradius for years to authenticate pppoe users for my WISP., Customers get dynamic IP addresses from an IP pool. Im going to be implementing a new monitoring system, and I need to use hostnames to check on customer status. Anyone have ideas how freeradius can update /etc/hosts so a dns server such as dnsmasq can serve the hostnames of customers as their IP changes?