#! /bin/sh
# Copyright (c) 1996, 1997, 1998 S.u.S.E. GmbH
# Copyright (c) 1998, 1999, 2000, 2001 SuSE GmbH
# Copyright (c) 2002, 2003 SuSE Linux AG
#
# Author: Rolf Haberrecker <rolf@suse.de>, 1997, 1998, 1999
#         Peter Poeml <poeml@suse.de>, 2000, 2001, 2002, 2003
#
# /etc/init.d/dhcpd
#   and its symbolic link
# /usr/sbin/rcdhcpd
#
### BEGIN INIT INFO
# Provides:			dhcpd
# Required-Start:		$local_fs $remote_fs $network 
# X-UnitedLinux-Should-Start:	$named $syslog $time
# Required-Stop:		$local_fs $remote_fs $network
# X-UnitedLinux-Should-Stop:	$named $syslog 
# Default-Start:		3 5
# Default-Stop:			0 1 2 6
# Short-Description:		DHCP Server
# Description:			Start DHCP (Dynamic Host Configuration Protocol) 
#				server. (Note: if configured for failover it
#				needs to rely on time synchronisation.)
### END INIT INFO


if [ -s /etc/sysconfig/dhcpd ]; then 

	. /etc/sysconfig/dhcpd

else 
	# pre 8.0

	# Source SuSE config
	. /etc/rc.config

	test -s /etc/rc.config.d/dhcpd.rc.config && \
	      . /etc/rc.config.d/dhcpd.rc.config

	# Determine the base and follow a runlevel link name.
	base=${0##*/}
	link=${base#*[SK][0-9][0-9]}

	# Force execution if not called by a runlevel directory.
	test $link = $base && START_DHCPD=yes
	test "$START_DHCPD" = yes || exit 0

fi


test "$DHCPD_RUN_CHROOTED" = "yes" && CHROOT_PREFIX=/var/lib/dhcp/
DAEMON="DHCP server"
[ "$DHCPD_BINARY" = /usr/sbin/dhcpd.lpf ] && DHCPD_BINARY=/usr/sbin/dhcpd
DAEMON_BIN=${DHCPD_BINARY:=/usr/sbin/dhcpd}
DAEMON_CONF=/etc/dhcpd.conf
DAEMON_PIDFILE=/var/run/dhcpd.pid
STARTPROC_LOGFILE=/var/log/rc.dhcpd.log
SUPPORTS_HUP="no"

# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     ditto but be verbose in local rc status
#      rc_status -v -r  ditto and clear the local rc status
#      rc_failed        set local and overall rc status to failed
#      rc_failed <num>  set local and overall rc status to <num><num>
#      rc_reset         clear local rc status (overall remains)
#      rc_exit          exit appropriate to overall rc status
. /etc/rc.status

# First reset status of this service
rc_reset

# 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.

if ! [ -x $DAEMON_BIN ]; then 
	echo >&2 "$0: \"$DAEMON_BIN\" is not an executable file. Exiting."
	rc_failed 1
	rc_status -v1
	rc_exit
fi

# remove empty pid files to avoid disturbing warnings by checkproc/killproc
# (these can occur if dhcpd does not start correctly)
test -e $DAEMON_PIDFILE && ! test -s $DAEMON_PIDFILE && rm $DAEMON_PIDFILE
test -e $CHROOT_PREFIX/$DAEMON_PIDFILE && ! test -s $CHROOT_PREFIX/$DAEMON_PIDFILE && rm $CHROOT_PREFIX/$DAEMON_PIDFILE

case "$1" in
    start)
	echo -n "Starting $DAEMON "

        ## If there is no conf file, skip starting of dhcpd
        ## and return with "program not configured"
	if ! [ -f $DAEMON_CONF ]; then
		echo -e -n "... no configuration file found";
		# Tell the user this has skipped
		rc_status -s
		# service is not configured
		exit 6;
	fi

        ## If the interfaces are not set, skip starting of dhcpd
        ## and return with "program not configured"
	if [ -z "$DHCPD_INTERFACE" ]; then
		echo -n "... cannot... DHCPD_INTERFACE in /etc/sysconfig/dhcpd is empty!"
		# Tell the user this has skipped
		rc_status -s
		# service is not configured
		exit 6;
	fi
	
	if [ "$DHCPD_INTERFACE" = "ANY" ]; then
		DHCPD_INTERFACE=""
	fi

	# it might be necessary to convert "configuration names" (as in
	# /etc/sysconfig/network/ifcfg-* into "interface names" (like eth*)
	if [ -x /sbin/getcfg-interface ]; then
		unset interfaces
		for i in $DHCPD_INTERFACE; do 
			interfaces="$interfaces$(/sbin/getcfg-interface $i) "
		done
		DHCPD_INTERFACE=$interfaces
	fi

	jail=/var/lib/dhcp; leases=dhcpd.leases
	if ! [ -e $jail/db/$leases ]; then
		# until 9.0, the lease file was in /var/lib/dhcp and part of the package
		if test -e $jail/$leases -a '!' -L $jail/$leases; then
			# this is the case where the %post script runs _before_ the old package is 
			# removed (i.e., dhcpd.leases has not renamed to .rpmsave yet)
			mv $jail/$leases $jail/db/$leases && \
			ln -s db/$leases $jail/
		elif test -e $jail/$leases.rpmsave; then
			# this is what's left when the package is already gone.
			mv $jail/$leases.rpmsave $jail/db/$leases && \
			ln -s db/$leases $jail/
		else
			# fresh installation:
			# a lease file must be present. the server won't start without
			touch $jail/db/$leases
		fi
	fi

	if test "$DHCPD_RUN_CHROOTED" = "yes" ; then 
		## copy the conf file to the chroot jail (dhcpd has to be restarted anyway, 
		## when it has changed) and change path to leases file
		for i in $DAEMON_CONF $DHCPD_CONF_INCLUDE_FILES; do
			test -d $CHROOT_PREFIX/${i%/*} || mkdir -p $CHROOT_PREFIX/${i%/*}
		done
		for i in $DAEMON_CONF $DHCPD_CONF_INCLUDE_FILES /etc/{resolv.conf,host.conf,hosts,localtime}; do
			if ! test -e $i; then continue; fi # neither of them is absolutely necessary
			cp -aL $i $CHROOT_PREFIX/$i &>/dev/null \
				|| { echo "...$0:$LINENO: could not copy $i to chroot jail"; rc_failed; rc_status -v1; exit 6; }
		done
		libdir=/$(basename $(echo /var/lib/dhcp/lib*))
		for i in /$libdir/{libresolv.so.2,libnss_dns{,6}.so.2}; do 
			if [ -s $i ]; then 
				cp -pL $i /var/lib/dhcp/$libdir/ \
				|| { echo "...$0:$LINENO: could not copy $i to chroot jail"; rc_failed; rc_status -v1; exit 6; }
		fi
		done
		DHCPD_ARGS="-chroot $CHROOT_PREFIX -lf /db/dhcpd.leases"

		## If there is a pid file containing a pid, the machine might have crashed. pid files in
		## /var/run are always cleaned up at boot time, but this is not the case for the pid file in 
		## the chroot jail. Therefore, and old pid file may exist. This is only a problem if it 
		## incidentally contains the pid of a running process. If this process is not a 'dhcpd', 
		## we remove the pid. (dhcpd itself only checks whether the pid is alive or not.)
		if test -e $CHROOT_PREFIX/$DAEMON_PIDFILE -a -s $CHROOT_PREFIX/$DAEMON_PIDFILE; then
			i=$(<$CHROOT_PREFIX/$DAEMON_PIDFILE)
			if pidof dhcpd &>/dev/null; then 
				echo -n "(already running) "
			else 
				rm $CHROOT_PREFIX/$DAEMON_PIDFILE
			fi
		fi

	fi

	if [ -n "$DHCPD_RUN_AS" ]; then
		DHCPD_RUN_AS_GROUP="$(getent group $(getent passwd $DHCPD_RUN_AS | cut -d: -f4) | cut -d: -f1)"
		DHCPD_ARGS="$DHCPD_ARGS -user $DHCPD_RUN_AS -group $DHCPD_RUN_AS_GROUP"
	fi


	## check syntax with -t (output to log file) and start only when the syntax is okay
	rm -f $STARTPROC_LOGFILE # start log
	error=0
	if ! $DAEMON_BIN -t -cf $CHROOT_PREFIX/$DAEMON_CONF > $STARTPROC_LOGFILE 2>&1 ; then
		error=1
	else
		## Start daemon. If this fails the return value is set appropriate.
		## The init script should return 0, even if service is already running, 
		## to match the LSB spec.

		test "$2" = "-v" && echo -en \
			"\nexecuting '$DAEMON_BIN $DHCPD_ARGS $DHCPD_OTHER_ARGS $DHCPD_INTERFACE'"

		$DAEMON_BIN $DHCPD_ARGS $DHCPD_OTHER_ARGS $DHCPD_INTERFACE &> $STARTPROC_LOGFILE
		ret=$?
	fi	
	
	if [ $error -gt 0 -o ${ret:-0} -gt 0 ]; then 
		cat $STARTPROC_LOGFILE 
		## set status to failed
		rc_failed
	else
		[ "$DHCPD_RUN_CHROOTED" = "yes" ] && echo -n "[chroot]" || :
	fi

	# Remember status and be verbose
	rc_status -v
	;;
    stop)
	echo -n "Shutting down $DAEMON "

	## Stop daemon with killproc(8) and if this fails
	## set echo the echo return value.

	killproc -p $CHROOT_PREFIX/$DAEMON_PIDFILE -TERM $DAEMON_BIN
	ret=$?
	if test -s $CHROOT_PREFIX/$DAEMON_PIDFILE; then 
		kill $(<$CHROOT_PREFIX/$DAEMON_PIDFILE) 2>/dev/null
	fi

	# remove libraries from the chroot jail, just so they are not left over 
	# if the server is deinstalled
	if [ "$DHCPD_RUN_CHROOTED" = yes ]; then 
		rm -f $CHROOT_PREFIX/lib*/*
	fi

	# Remember status and be verbose
	rc_failed $ret
	rc_status -v
	;;
    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
	else
		rc_reset        # Not running is not a failure.
	fi
	# Remember status and be quiet
	rc_status
	;;
    restart)
	## Stop the service and regardless of whether it was
	## running or not, start it again.
	$0 stop
	sleep 3
	$0 start

	# Remember status and be quiet
	rc_status
	;;
    force-reload)
	## Signal the daemon to reload its config. Most daemons
	## do this on signal 1 (SIGHUP).
	## If it does not support it, restart.

	echo -n "Reload service $DAEMON"

	if [ "$SUPPORTS_HUP" = "yes" ]; then 
		killproc -p $DAEMON_PIDFILE -HUP $DAEMON_BIN
		#touch $DAEMON_PIDFILE
		rc_status -v
	else
		$0 stop  &&  sleep 3  &&  $0 start
		rc_status 
	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
		rc_status -v
	else
		## Otherwise if it does not support reload:
		rc_failed 3
		rc_status -v
	fi
	;;
    status)
	echo -n "Checking for $DAEMON: "
	## 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 /var/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 $CHROOT_PREFIX/$DAEMON_PIDFILE $DAEMON_BIN
	rc_status -v
	;;
    probe)
	## Optional: Probe for the necessity of a reload,
	## give out the argument which is required for a reload.

	rc=0
	for i in /etc/sysconfig/dhcpd $DAEMON_CONF $DHCPD_CONF_INCLUDE_FILES; do
		test $i -nt $CHROOT_PREFIX/$DAEMON_PIDFILE && rc=1
	done
	test $rc = 1 && echo restart
	;;
    check-syntax|syntax-check)
	echo "Checking syntax of $DAEMON_CONF: "

	## this nice bit is from Edwin Groothuis:
	## check syntax (quiet)
	$DAEMON_BIN -q -t -cf $DAEMON_CONF
	if ! [ $? -eq 0 ]; then 
		## check syntax (verbose)
		$DAEMON_BIN -t -cf $DAEMON_CONF
		echo -e '\nConfig is NOT okay\n'
	else
		echo 'Config is okay. Hope you also specified existent network devices ;) '

		## in v3, lease file checking is also implemented
		if [ $DAEMON_BIN != "/usr/sbin/dhcpd-2" ]; then
			## check leases file (quiet)
			$DAEMON_BIN -q -T -cf $DAEMON_CONF -lf /var/lib/dhcp/db/dhcpd.leases
			if ! [ $? -eq 0 ]; then
				## check leases file (verbose)
				$DAEMON_BIN -T -cf $DAEMON_CONF -lf /var/lib/dhcp/db/dhcpd.leases
				echo -e '\nLease file is NOT okay'
			else
				echo 'Lease file is okay'
			fi
		fi
	fi
	;;
    *)
	echo "Usage: $0 {start|stop|status|try-restart|restart|force-reload|reload|probe|check-syntax} [-v]"
	exit 1
esac
rc_exit