#!/bin/sh
# ubus monitor to trace dns backend events and conditionally restart adblock
# written by Dirk Brenken (dev@brenken.org)

# This is free software, licensed under the GNU General Public License v3.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

LC_ALL=C
PATH="/usr/sbin:/usr/bin:/sbin:/bin"

if [ -r "/lib/functions.sh" ]
then
	. "/lib/functions.sh"
	adb_basever="$(uci_get adblock global adb_basever)"
	adb_dns="$(uci_get adblock global adb_dns)"
fi
adb_ubus="$(command -v ubus)"

if [ -x "${adb_ubus}" ] && [ -n "${adb_dns}" ]
then
	logger -p "info" -t "adblock-${adb_basever}  [${$}]" "ubus/adblock service started"
	"${adb_ubus}" -S -M r -m invoke monitor | \
		{ grep -qF "\"method\":\"set\",\"data\":{\"name\":\"${adb_dns}\""; [ $? -eq 0 ] && /etc/init.d/adblock start; }
else
	logger -p "err" -t "adblock-${adb_basever}  [${$}]" "can't start ubus/adblock service"
fi