#! /bin/sh
# Copyright (c) 1996, 1997, 1998 S.u.S.E. GmbH
# Copyright (c) 1998, 1999, 2000, 2001 SuSE GmbH
# Copyright (c) 2002 SuSE Linux AG
# Copyright (c) 2003-2014 SUSE LINUX Products GmbH
#
# Author: Peter Poeml <poeml@suse.de>, 2001
#         Marius Tomaschewski <mt@suse.de>, 2010
#
# /usr/lib/dhcp/dhcrelay helper,
# fromer /etc/init.d/dhcrelay init script
#
###

DHCPv_OPT=$1 ; shift
case $DHCPv_OPT in
-4)
	DAEMON="ISC DHCPv4 relay agent"
	DAEMON_BIN=/usr/sbin/dhcrelay
	DAEMON_CONF=/etc/sysconfig/dhcrelay
	DAEMON_PIDFILE=/run/dhcrelay.pid
	STARTPROC_LOGFILE=/var/log/rc.dhcrelay.log
	SUPPORTS_HUP="no"
;;
-6)
	DAEMON="ISC DHCPv6 relay agent"
	DAEMON_BIN=/usr/sbin/dhcrelay6
	DAEMON_CONF=/etc/sysconfig/dhcrelay
	DAEMON_PIDFILE=/run/dhcrelay6.pid
	STARTPROC_LOGFILE=/var/log/rc.dhcrelay6.log
;;
*)
	echo >&2 "Usage: $0 <-4|-6> <action>"
	exit 2
;;
esac

test -s "$DAEMON_CONF" && . "$DAEMON_CONF"
if ! [ -x "$DAEMON_BIN" ]; then
	case $1 in
	stop)   ;;
	*)      echo -n >&2 "$0: \"$DAEMON_BIN\" is not an executable file. Exiting."
		case $1 in
		status) exit 4 ;;
		*)      exit 5 ;;
		esac
	;;
	esac
	exit 0
fi

# Return values acc. to LSB for all commands but status:
# 0 - success
# 1 - generic or unspecified error
# 2 - invalid or excess argument(s)
# 3 - unimplemented feature (e.g. "reload")
# 4 - insufficient privilege
# 5 - program is not installed
# 6 - program is not configured
# 7 - program is not running
# 
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signalling is not supported) are
# considered a success.

case "$1" in
    start)
        # FIXME: this check is pointless since systemd already do it.
	echo -n "Starting $DAEMON"
	checkproc -p $DAEMON_PIDFILE $DAEMON_BIN && {
		echo -n "... already running"; exit 0;
	}

	case $DHCPv_OPT in
	-4)
	        ## If interfaces or servers are not set, skip starting of dhcrelay
	        ## and return with "program not configured"
		if [ -z "$DHCRELAY_INTERFACES" -o -z "$DHCRELAY_SERVERS" ]; then
			# service is not configured
			exit 6;
		fi
	
		DHCRELAY_INTERFACES_ARGS=''
		for i in $DHCRELAY_INTERFACES ; do
			DHCRELAY_INTERFACES_ARGS="$DHCRELAY_INTERFACES_ARGS -i $i"
		done

		DHCRELAY_ARGS="$DHCRELAY_OPTIONS $DHCRELAY_INTERFACES_ARGS $DHCRELAY_SERVERS"
	;;
	-6)
		DHCRELAY6_LOWER_INTERFACES_ARGS=''
		for l in $DHCRELAY6_LOWER_INTERFACES ; do
			test "x$l" = x -o "x$l" = "x-l" && continue
			DHCRELAY6_LOWER_INTERFACES_ARGS="$DHCRELAY6_LOWER_INTERFACES_ARGS -l $l"
		done
		DHCRELAY6_UPPER_INTERFACES_ARGS=''
		for u in $DHCRELAY6_UPPER_INTERFACES ; do
			test "x$u" = x -o "x$u" = "x-u" && continue
			DHCRELAY6_UPPER_INTERFACES_ARGS="$DHCRELAY6_UPPER_INTERFACES_ARGS -u $u"
		done
		if [ "x$DHCRELAY6_LOWER_INTERFACES_ARGS" = x -o \
		     "x$DHCRELAY6_UPPER_INTERFACES_ARGS" = x ]; then
			# service is not configured
			exit 6;
		fi
		DHCRELAY_ARGS="$DHCRELAY6_OPTIONS $DHCRELAY6_LOWER_INTERFACES_ARGS $DHCRELAY6_UPPER_INTERFACES_ARGS"
	;;
	esac
	## Start daemon with startproc(8). If this fails
	## the echo return value is set appropriate.

	# startproc should return 0, even if service is 
	# already running to match LSB spec.
	if [ "$2" = "-v" ]; then
		echo
		echo -n "executing '$DAEMON_BIN $DHCPv_OPT $DHCRELAY_ARGS'"
	fi
	startproc -q -l $STARTPROC_LOGFILE -p $DAEMON_PIDFILE $DAEMON_BIN $DHCPv_OPT $DHCRELAY_ARGS >/dev/null 2>&1
	rc=$?
	if ! [ $rc -eq 0 ]; then
		## be verbose
		echo ""
		echo -n "  please see $STARTPROC_LOGFILE for details "
		## set status to failed
		exit 1
	fi
	;;
    stop)
	echo -n "Shutting down $DAEMON"
	## Stop daemon with killproc(8) and if this fails
	## set echo the echo return value.

	killproc -p $DAEMON_PIDFILE $DAEMON_BIN 
	;;
    try-restart)
	## Do a restart only if the service was active before.
	## Note: try-restart is now part of LSB (as of 1.9).
	## RH has a similar command named condrestart.
	$0 status
	if test $? = 0; then
		$0 restart
	fi
	;;
    restart)
	## Stop the service and regardless of whether it was
	## running or not, start it again.
	$0 stop
	sleep 1
	$0 start
	;;
    force-reload)
	## Signal the daemon to reload its config. Most daemons
	## do this on signal 1 (SIGHUP).
	## If it does not support it, restart.

	$0 stop  &&  sleep 1  &&  $0 start || exit

	echo -n "Reload service $DAEMON"

	if [ "$SUPPORTS_HUP" = "yes" ] ; then 
		killproc -p $DAEMON_PIDFILE -HUP $DAEMON_BIN
		#touch $DAEMON_PIDFILE
	else
		$0 stop  &&  $0 start
	fi
	;;
    reload)
	## Like force-reload, but if daemon does not support
	## signalling, do nothing (!)

	if [ "$SUPPORTS_HUP" = "yes" ] ; then
		# If it supports signalling:
		echo -n "Reload service $DAEMON"
		killproc -p $DAEMON_PIDFILE -HUP $DAEMON_BIN
		#touch $DAEMON_PIDFILE
	else
		## Otherwise if it does not support reload:
		exit 3
	fi
	;;
    status)
        echo -n "Checking for dhcp relay agent: "
	## Check status with checkproc(8), if process is running
	## checkproc will return with exit status 0.

	# Status has a slightly different for the status command:
	# 0 - service running
	# 1 - service dead, but /run/ pid file exists
	# 2 - service dead, but /var/lock/ lock file exists
	# 3 - service not running

	# NOTE: checkproc returns LSB compliant status values.
	checkproc -p $DAEMON_PIDFILE $DAEMON_BIN
	;;
    probe)
	## Optional: Probe for the necessity of a reload,
	## give out the argument which is required for a reload.

	if [ "$DAEMON_CONF" -nt "$DAEMON_PIDFILE" ]; then 
		if [ "$SUPPORTS_HUP" = "yes" ]; then 
			echo reload
		else 
			echo restart
		fi
	fi
	;;
    *)
	SCRIPT="${SCRIPT:-${0##*/} $DHCPv_OPT}"
	echo "Usage: $SCRIPT {start|stop|status|try-restart|restart|force-reload|reload|probe} [-v]"
	exit 1
	;;
esac