#!/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=bird
CFGFILE='/tmp/flash/bird.conf'
[ -e /etc/bird.conf -a ! -e $CFGFILE ] && CFGFILE='/etc/bird.conf'

case "$1" in
        ''|load|start|restart)
		if [ ! -r '/mod/etc/conf/bird.cfg' ]; then
			echo 'Error[bird]: not configured' 1>&2
			exit 1
		fi

		. /mod/etc/conf/bird.cfg
	;;
esac

ar7ipaddr () {
	local SEC=$1
	local DEV=$2
	echo $(echo 'ar7cfg.'$SEC'['$DEV'].ipaddr' | ar7cfgctl -s)
}

getipaddr () {
	local ethmode=$(echo 'ar7cfg.ethmode' | ar7cfgctl -s)
	local devname=lan
	local section=ethinterfaces
	case "$ethmode" in
		ethmode_bridge)
			section=brinterfaces
			break
			;;
	esac
	local ipaddr=$(ar7ipaddr $section $devname)
	if [ -z "$ipaddr" ]; then
		devname=eth0
		ipaddr=$(ar7ipaddr $section $devname)
	fi
	if [ -z "$ipaddr" ]; then
		ipaddr=169.254.1.1
	fi
	echo $ipaddr
}

start() {
	if [ ! -e "$CFGFILE" ]; then
		echo "Creating $CFGFILE"
		{
		  echo "router id $(getipaddr);"
		  cat <<"EOF"
protocol device {
  scan time 10;
}
protocol direct {
  interface "lan", "wlan", "tun*";
}
protocol kernel {
  learn;
  scan time 20;
  import all;
  export all;
}
protocol static {
}
filter skipdefault {
  if net = 0.0.0.0/0 then reject;
  accept;
}
protocol rip mainrip {
  import filter skipdefault;
  export filter skipdefault;
}
protocol ospf mainospf {
  import filter skipdefault;
  export filter skipdefault;
  area 0 {
    interface "lan"  { cost 10; };
    interface "wlan" { cost 15; };
    interface "tun*" { cost 50; };
  };
}
EOF
		} > $CFGFILE
		/usr/bin/modsave flash
	fi

	echo -n 'Starting bird...'
	$DAEMON -c $CFGFILE > /dev/null 2>&1
	exitval=$?
	if [ "$exitval" -eq 0 ]; then
		echo 'done.'
	else
		echo 'failed.'
		exit $exitval
	fi
}

stop() {
	if [ ! -z "$(pidof "$DAEMON")" ]; then
		echo -n 'Stopping bird...'
		killall $DAEMON > /dev/null 2>&1
		exitval=$?
		
		if [ "$exitval" -eq 0 ]; then
			echo 'done.'
		else
			echo 'failed.'
			exit $exitval
		fi
	fi
}

case "$1" in
	''|load)
		modreg cgi 'bird' 'BIRD'

		deffile='/mod/etc/default.bird/bird_conf.def'
		[ -r '/tmp/flash/bird_conf.def' ] && deffile='/tmp/flash/bird_conf.def'
		[ "$CFGFILE" != '/etc/bird.conf' ] && modreg file 'bird_conf' 'BIRD: bird.conf' 0 "$deffile"

		if [ "$BIRD_ENABLED" = 'no' ]; then
			echo 'BIRD is disabled' 1>&2
			exit 1
		fi

		[ "$BIRD_AUTOSTARTDELAY" -gt 0 ] && sleep $BIRD_AUTOSTARTDELAY
		start
		;;
	unload)
		stop
		[ "$CFGFILE" != '/etc/bird.conf' ] && modunreg file 'bird_conf'
		modunreg cgi 'bird'
		;;
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop
		sleep 1
		start
		;;
	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