#!/bin/sh

DAEMON=dnsmasq
DAEMON_LONG_NAME=dnsmasq
DAEMON_USER=nobody
DAEMON_GROUP=nobody
PID_FILE=/var/run/$DAEMON/$DAEMON.pid

. /etc/init.d/modlibrc

PID_MULTID=$(pidof -s multid)
if [ ! -z "$PID_MULTID" ]; then
	MULTID=$(xargs -0 </proc/$PID_MULTID/cmdline)
else
	MULTID=multid
fi

start() {
	local lease

	modlib_addgroup $DAEMON_GROUP
	modlib_adduser $DAEMON_USER -s /bin/false -D -S -H -G $DAEMON_GROUP -g $DAEMON_GROUP
	mkdir -p ${PID_FILE%/*}
	chown $DAEMON_USER:$DAEMON_GROUP ${PID_FILE%/*}

	(
		if [ -x "/tmp/flash/${DAEMON}_conf" ]; then
			/tmp/flash/${DAEMON}_conf
		else
			/mod/etc/default.$DAEMON/${DAEMON}_conf
		fi

		if [ -r "/tmp/flash/${DAEMON}.extra" ]; then
			cat /tmp/flash/${DAEMON}.extra
		fi
	) > /mod/etc/$DAEMON.conf

	echo -n 'Starting dnsmasq...'
	if [ "$1" != "nomultid" ]; then
		multid -s > /dev/null 2>&1
	fi
	OPTIONS="--pid-file=$PID_FILE $DNSMASQ_OPTIONS"
	if [ "$DNSMASQ_DNS_PORT" ]; then
		OPTIONS="$OPTIONS -p \"$DNSMASQ_DNS_PORT\""
	fi
	eval "$DAEMON $OPTIONS"
	exitval=$?

	if [ "$1" != "nomultid" ]; then
		$MULTID > /dev/null 2>&1
		# protect against dnsmasq crash
		[ -f /var/tmp/avm-resolv.conf -a ! -L /var/tmp/avm-resolv.conf ] &&
			mv /var/tmp/avm-resolv.conf /var/tmp/resolv.conf
		ln -s resolv.conf /var/tmp/avm-resolv.conf
	fi

	if [ ! -L "/var/flash/multid.leases" -a "$DNSMASQ_DHCP" = "yes" ]; then
		rm -f /var/flash/multid.leases
		touch /var/tmp/multid.leases
		ln -s /var/tmp/multid.leases /var/flash/multid.leases
	fi

	# this could pose problems when a client comes too fast
	for lease in /var/tmp/multid.leases /var/tmp/dnsmasq.leases; do
		if [ -f $lease ]; then
			chmod 0664 $lease
			chown root:nobody $lease
		fi
	done

	if [ "$exitval" -eq 0 ]; then
		echo 'done.'
	else
		echo 'failed.'
		exit $exitval
	fi
}

stop() {
	echo -n 'Stopping dnsmasq...'
	if [ "$1" != "nomultid" ]; then
		multid -s > /dev/null 2>&1
		rm /var/tmp/avm-resolv.conf
	fi
	kill $(cat $PID_FILE) 2> /dev/null
	exitval=$?
	if [ "$1" != "nomultid" ]; then
		$MULTID > /dev/null 2>&1
	fi

	rm -f /mod/etc/$DAEMON.conf

	if [ -L "/var/flash/multid.leases" ]; then
		major="$(grep tffs /proc/devices)"
		rm -f /var/flash/multid.leases
		mknod /var/flash/multid.leases c ${major%%tffs} $((0x70))
	fi

	if [ "$exitval" -eq 0 ]; then
		echo 'done.'
	else
		echo 'failed.'
		exit $exitval
	fi
}

case "$1" in
        ""|load)
		modreg cgi 'dnsmasq' 'Dnsmasq'
		
		deffile='/mod/etc/default.dnsmasq/dnsmasq_extra.def'
		[ -r "/tmp/flash/dnsmasq_extra.def" ] && deffile='/tmp/flash/dnsmasq_extra.def'
		modreg file 'dnsmasq_extra' 'Dnsmasq-Extra' 0 "$deffile"

		if [ "$DNSMASQ_ENABLED" != "yes" ]; then
			echo "$DAEMON is disabled" 1>&2
			exit 1;
		fi

		if modlib_check_running; then
			echo "$DAEMON already started."
		else
			if [ -z "$(pidof multid)" ]; then
				start nomultid
			else
				start
			fi
		fi
		;;
	unload)
		stop
		modunreg cgi 'dnsmasq'
		;;
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop nomultid
		sleep 1
		start nomultid
		;;
	status)
		modlib_status
		;;
	*)
		echo "Usage: $0 [load|unload|start|stop|restart|status]" 1>&2
		exit 1
		;;
esac

exit 0