#!/bin/sh

DAEMON=opendd
DAEMON_LONG_NAME=OpenDD
. /etc/init.d/modlibrc

set_cron() {
	CRON_OLD="$(cat /tmp/cron.d/opendd 2>/dev/null)"
	if [ "$OPENDD_ENABLED" == "yes" -a "$OPENDD_FORCE_UPDATE" == "yes" ]; then
		CRON_NEW="45 5 * * *  /etc/init.d/rc.opendd cron"
	fi
	if [ "$CRON_OLD" != "$CRON_NEW" ] ; then
		mkdir -p /tmp/cron.d/
		echo "$CRON_NEW" > /tmp/cron.d/opendd
		/etc/init.d/rc.crond reload
	fi
}

update_ip() {
	echo "$1" > /tmp/.opendd.ip
	$DAEMON -c /mod/etc/$DAEMON.conf
	rm -rf /tmp/.opendd.ip 2>/dev/null
}

run() {
	echo -n "Running $DAEMON_LONG_NAME ... "
	if modlib_check_running; then
		echo 'already running.'
		exit 0
	fi
	if [ "$OPENDD_ENABLED" != "yes" ]; then
		echo 'is disabled.'
		exit 0
	fi
	if [ ! -x "$(which $DAEMON_BIN)" ]; then
		echo "binary not found, skipped."
		exit 1
	fi

	modlib_config
	chmod 600 /mod/etc/$DAEMON.conf

	NEW_IP=$(get_ip 2>/dev/null)
	if [ -z "$NEW_IP" ]; then
		echo 'failed.'
		exit 1
	fi

	if [ "$OPENDD_FORCE_UPDATE" == "yes" ]; then
		OLD_IP="$(cat /tmp/flash/opendd/opendd.ip 2>/dev/null)"
		if [ "$OLD_IP" != "$NEW_IP" ]; then
			rm -rf /tmp/flash/opendd/opendd.ip
		else
			find /tmp/flash/opendd/ -name opendd.ip -mtime +25 -exec rm -rf {} ';'
			if [ ! -e /tmp/flash/opendd/opendd.ip ]; then
				update_ip 127.168.178.1
				sleep 90
			fi
		fi
		if [ ! -e /tmp/flash/opendd/opendd.ip ]; then
			echo "$NEW_IP" >/tmp/flash/opendd/opendd.ip
			modsave flash >/dev/null
		fi
	fi
	update_ip $NEW_IP

	# return-value of opendd is always 0
	echo 'done.'
}

case $1 in
	""|load)
		mkdir -p /tmp/flash/opendd
		[ ! -e /tmp/flash/opendd/opendd.pem ] && touch /tmp/flash/opendd/opendd.pem

		modreg cgi 'opendd' 'OpenDD'
		modreg file opendd opendd_pem 'opendd.pem' 0 "opendd_pem"
		modreg daemon --hide opendd

		if [ "$OPENDD_ENABLED" != "yes" ]; then
			echo "$DAEMON is disabled." 1>&2
			exit 1
		else
			set_cron
			#check if this script is executed by rc.external
			if [ "$(ps | sed -rn "s/^ *$PPID .*(rc.external).*/y/p")" != "y" ]; then
				echo "$DAEMON is enabled." 1>&2
			else
				run
			fi
		fi
		;;
	unload)
		modunreg cgi 'opendd'
		modunreg file opendd
		modunreg daemon opendd
		;;
	run)
		run
		;;
	config)
		set_cron
		;;
	cron)
		[ "$OPENDD_ENABLED" != "yes" ] && return
		logger -t info Run OpenDD by cron.
 		run
		;;
	*)
		echo "Usage: $0 [load|unload|run|config|cron]" 1>&2
		exit 1
		;;
esac

exit 0