#! /usr/bin/env bash
foreign_option_1='dhcp-option DNS 209.222.18.222'
foreign_option_2='dhcp-option DNS 209.222.18.218'
foreign_option_3='dhcp-option DNS 8.8.8.8'

[ -x /sbin/resolvconf ] || exit 0
[ "$script_type" ] || exit 0
[ "$dev" ] || exit 0

split_into_parts()
{
        part1="$1"
        part2="$2"
        part3="$3"
}

case "$script_type" in
  up)
        NMSRVRS=""
        SRCHS=""
        for optionvarname in ${!foreign_option_*} ; do
                option="${!optionvarname}"
                echo "$option"
                split_into_parts $option
                if [ "$part1" = "dhcp-option" ] ; then
                        if [ "$part2" = "DNS" ] ; then
                                NMSRVRS="${NMSRVRS:+$NMSRVRS }$part3"
                        elif [ "$part2" = "DOMAIN" ] ; then
                                SRCHS="${SRCHS:+$SRCHS }$part3"
                        fi
                fi
        done
        R=""
        [ "$SRCHS" ] && R="search $SRCHS
"
        for NS in $NMSRVRS ; do
                R="${R}nameserver $NS
"
        done
        echo -n "$R" | /sbin/resolvconf -a "${dev}.openvpn"
        ;;
  down)
        /sbin/resolvconf -d "${dev}.openvpn"
        ;;
esac