Postlogin script

Hi, I would like to prepare postlogin a script that allow imap connection to roundcube for all but restrict imap access for selected users.

My question is that:

Is possible in condition IF use IP addresses as range or with mask (because I've more than one web servers) ?

My script:

#!/bin/sh if [ "$IP" = "172.11.0.28" ] ; then printf "* [ALERT] Access allowed from that IP\r\n" exec "$@" fi

CHECK_USER=PGPASSWORD="somepass" /usr/local/pg950/bin/psql -q -t -U someuser -d maildb -c "select imap_allowed from __users where name = '$USER' LIMIT 1"

if [ $CHECK_USER == "f" ] ; then exit 0 fi

if [ $CHECK_USER == "t" ] ; then exec "$@" fi

Regards, Jack