#!/bin/sh

export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/mod/sbin:/mod/bin:/mod/usr/sbin:/mod/usr/bin
export LD_LIBRARY_PATH=/mod/lib

DAEMON=dnsmasq

. /etc/init.d/modlibrc

# Do we have a UPnP server (igdd) or was ist stripped from the firmware?
_igdd=$(basename $(which igdd) 2> /dev/null)
# Does a multid option to start without UPnP device (-u) exist?
_multid_upnp=$(/sbin/multid -? 2>&1 | grep upnp)
# Set multid "no UPnP" option, if
#   a) it has the parameter at all AND
#   b) igdd binary does *not* exist
[ "$_multid_upnp" ] && [ ! "$_igdd" ] && MULTIDPARAM="-u"

start() {
	local lease

	modlib_addgroup nobody
	modlib_adduser nobody -s /bin/false -D -S -H -G nobody -g 'nobody'

	(
		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 [ "$1" != "nomultid" ]; then
		multid -s > /dev/null 2>&1
	fi
	OPTIONS="$DNSMASQ_OPTIONS"
	if [ "$DNSMASQ_DNS_PORT" ]; then
		OPTIONS="$OPTIONS -p \"$DNSMASQ_DNS_PORT\""
	fi
	eval "$DAEMON $OPTIONS"
	exitval=$?

	if [ "$1" != "nomultid" ]; then
		multid $MULTIDPARAM > /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
	killall $DAEMON > /dev/null 2>&1
	exitval=$?
	if [ "$1" != "nomultid" ]; then
		multid $MULTIDPARAM > /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'

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

		if [ -e "/var/run/dnsmasq.pid" ]; 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)
		multid -s > /dev/null 2>&1
		stop nomultid
		sleep 1
		start nomultid
		multid $MULTIDPARAM > /dev/null 2>&1
		;;
	status)
		if [ -z "$(pidof "$DAEMON")" ]; then
			echo 'stopped'
		else
			echo 'running'
		fi
		;;
	*)
		echo "Usage: $0 [load|unload|start|stop|restart|status]" 1>&2
		exit 1
		;;
esac

exit 0