npppd_ppp_get_realm_name
realm_name = npppd_ppp_get_realm_name(_this->ppp->pppd, _this->ppp);
const char *npppd_ppp_get_realm_name(npppd *, npppd_ppp *);
realm = npppd_ppp_get_realm_name(_this->ppp->pppd, _this->ppp);