Set environnement variable

Hi guys, I'm using freeradius to authenticate users against PPP (Poptop and PPPOE). After connection, i start a few processes from /etc/ppp/ppp.linkup and need to set some user dependent variable. I would like to get those informations from the same database as for auth. Here is my question: Is it possible to set environnement variables during authentication process? Wth this, I will use them to launch my processes. (my other solution is to setup a secured connection to the sql database, but I would like to use freeradius if possible). Thanks for the help cheers Alex