#!/bin/bash
#
### BEGIN INIT INFO
# Provides: frr
# Required-Start: $local_fs $network $remote_fs $syslog
# Required-Stop: $local_fs $network $remote_fs $syslog
# Default-Start:  2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: start and stop the Frr routing suite
# Description: Frr is a routing suite for IP routing protocols like
#              BGP, OSPF, RIP and others. This script contols the main
#              daemon "frr" as well as the individual protocol daemons.
### END INIT INFO
#

PATH=/bin:/usr/bin:/sbin:/usr/sbin
D_PATH="@CFG_SBIN@" # /usr/lib/frr
C_PATH="@CFG_SYSCONF@" # /etc/frr
V_PATH="@CFG_STATE@" # /var/run/frr
VTYSH="@vtysh_bin@" # /usr/bin/vtysh
FRR_USER="@enable_user@" # frr
FRR_GROUP="@enable_group@" # frr
FRR_VTY_GROUP="@enable_vty_group@" # frrvty
FRR_CONFIG_MODE="@enable_configfile_mask@" # 0600
FRR_DEFAULT_PROFILE="@DFLT_NAME@" # traditional / datacenter

# Local Daemon selection may be done by using /etc/frr/daemons.
# See /usr/share/doc/frr/README.Debian.gz for further information.
# Keep zebra first and do not list watchfrr!
DAEMONS="zebra bgpd ripd ripngd ospfd ospf6d isisd babeld pimd ldpd nhrpd eigrpd sharpd pbrd staticd bfdd fabricd vrrpd"
MAX_INSTANCES=5
RELOAD_SCRIPT="$D_PATH/frr-reload.py"

if [ -e /lib/lsb/init-functions ]; then
	. /lib/lsb/init-functions
fi

if [ -f $D_PATH/ssd ]; then
	SSD=$D_PATH/ssd
else
	SSD=`which start-stop-daemon`
fi

# Print the name of the pidfile.
pidfile()
{
	echo "$V_PATH/$1.pid"
}

# Print the name of the vtysh.
vtyfile()
{
	echo "$V_PATH/$1.vty"
}

chownfrr()
{
	test -n "$FRR_USER" && chown "$FRR_USER" "$1"
	test -n "$FRR_GROUP" && chgrp "$FRR_GROUP" "$1"
	test -n "$FRR_CONFIG_MODE" && chmod "$FRR_CONFIG_MODE" "$1"
}

# Check if daemon is started by using the pidfile.
started()
{
	[ ! -e `pidfile $1` ] && return 3
	if [ -n "$2" ] && [ "$2" == "log" ]; then
		status_of_proc -p `pidfile $1` $1 $1 && return 0 || return $?
	else
		kill -0 `cat \`pidfile $1\`` 2> /dev/null || return 1
		return 0
	fi
}

# Loads the config via vtysh -b if configured to do so.
vtysh_b ()
{
	# Rember, that all variables have been incremented by 1 in convert_daemon_prios()
	if [ "$vtysh_enable" = 2 -a -f $C_PATH/frr.conf ]; then
		$VTYSH -b
	fi
}

# Check if the daemon is activated and if its executable and config files
# are in place.
# params:       daemon name
# returns:      0=ok, 1=error
check_daemon()
{
	if [ $1 != "watchfrr" -a $1 != "vtysh_enable" ]; then
		# check for daemon binary
		if [ ! -x "$D_PATH/$1" ]; then return 1; fi
	fi

	# If the integrated config file is used the others are not checked.
	if [ -r "$C_PATH/frr.conf" ]; then
		return 0
	fi

	# vtysh_enable has no config file nor binary so skip check.
	# (Not sure why vtysh_enable is in this list but does not hurt)
	if [ $1 != "watchfrr" -a $1 != "vtysh_enable" ]; then
		# check for config file
		if [ -n "$2" ]; then
			if [ ! -r "$C_PATH/$1-$2.conf" ]; then
				touch "$C_PATH/$1-$2.conf"
				chownfrr "$C_PATH/$1-$2.conf"
				chmod 0600 "$C_PATH/$1-$2.conf"
			fi
		elif [ ! -r "$C_PATH/$1.conf" ]; then
			touch "$C_PATH/$1.conf"
			chownfrr "$C_PATH/$1.conf"
			chmod 0600 "$C_PATH/$1.conf"
		fi
	fi
	return 0
}

# Starts the server if it's not alrady running according to the pid file.
# The Frr daemons creates the pidfile when starting.
start()
{
	local dmn inst
	dmn="$1"
	inst="$2"

	ulimit -n $MAX_FDS > /dev/null 2> /dev/null
	if [ "$dmn" = "watchfrr" ]; then

		# We may need to restart watchfrr if new daemons are added and/or
		# removed
		if started "$dmn" ; then
			stop watchfrr
		else
			# Echo only once. watchfrr is printed in the stop above
			echo -n " $dmn"
		fi

		eval "set - $watchfrr_options"
		${SSD} \
			--start \
			--pidfile=`pidfile $dmn` \
			--exec "$D_PATH/$dmn" \
			-- \
			"$@"

	elif [ -n "$inst" ]; then
		echo -n " $dmn-$inst"
		if ! check_daemon $dmn $inst ; then
			echo -n " (binary does not exist)"
			return;
		fi

		${SSD} \
			--start \
			--pidfile=`pidfile $dmn-$inst` \
			--exec "$D_PATH/$dmn" \
			-- \
			`eval echo "$""$dmn""_options"` $frr_global_options -n "$inst"
	else
		if ! check_daemon $dmn; then
			echo -n " (binary does not exist)"
			return;
		fi

		if [ "$valgrind_enable" = "yes" ]; then
			${SSD} \
				--start \
				--pidfile=`pidfile $dmn` \
				--exec "$valgrind" \
				-- --trace-children=no --leak-check=full --log-file=/var/log/frr/$dmn-valgrind.log $D_PATH/$dmn \
				`eval echo "$""$dmn""_options"` $frr_global_options
		else
			${SSD} \
				--start \
				--pidfile=`pidfile $dmn` \
				--exec "$D_PATH/$dmn" \
				-- \
				`eval echo "$""$dmn""_options"` $frr_global_options
		fi
	fi

	# Start the staticd automatically
	if [ "$dmn" = "zebra" ]; then
		echo -n "starting staticd since zebra is running"
		if ! check_daemon staticd ; then
			echo -n " (binary does not exist)"
			return;
		fi

		${SSD} \
			--start \
			--pidfile=`pidfile staticd` \
			--exec "$D_PATH/staticd" \
			-- \
			`eval echo "$"staticd"_options"` $frr_global_options
	fi
}

# Stop the daemon given in the parameter, printing its name to the terminal.
stop()
{
	local inst

	if [ -n "$2" ]; then
		inst="$1-$2"
	else
		inst="$1"
	fi

	if ! started "$inst" ; then
		echo -n " ($inst)"
		return 0
	else
		PIDFILE=`pidfile $inst`
		PID=`cat $PIDFILE 2>/dev/null`
		kill -2 $PID 2>/dev/null
		#
		#       Now we have to wait until $DAEMON has _really_ stopped.
		#
		if test -n "$PID" && kill -0 $PID 2>/dev/null; then
			cnt=0
			while kill -0 $PID 2>/dev/null; do
				cnt=`expr $cnt + 1`
				if [ $cnt -gt 60 ]; then
					# Waited 120 secs now, fail.
					echo -n "Failed.. "
					break
				fi
				sleep 2
			done
		fi
		rm -f `pidfile $inst`
		rm -f `vtyfile $inst`

		if [ "$1" = "zebra" ]; then
			echo -n "Stopping staticd since zebra is running"
			stop staticd
		fi
	fi
}

# Converts values from /etc/frr/daemons to all-numeric values.
convert_daemon_prios()
{
	for name in $DAEMONS zebra vtysh_enable watchfrr_enable; do
		# First, assign the value set by the user to $value
		eval value=\${${name}:0:3}

		# Daemon not activated or entry missing?
		if [ "$value" = "no" -o "$value" = "" ]; then value=0; fi

		# These strings parsed for backwards compatibility.
		if [ "$value" = "yes"  -o  "$value" = "true" ]; then
			value=1;
		fi

		# Zebra is threatened special. It must be between 0=off and the first
		# user assigned value "1" so we increase all other enabled daemons' values.
		if [ "$name" != "zebra" -a "$value" -gt 0 ]; then value=`expr "$value" + 1`; fi

		# If e.g. name is zebra then we set "zebra=yes".
		eval $name=$value
	done
}

# Starts watchfrr for all wanted daemons.
start_watchfrr()
{
	local daemon_name
	local daemon_prio
	local found_one
	local daemon_inst

	# Start the monitor daemon only if desired.
	if [ 0 -eq "$watchfrr_enable" ]; then
		return
	fi

	# Check variable type
	if declare -p watchfrr_options | grep -q '^declare \-a'; then
		# old array support
		watchfrr_options="${watchfrr_options[@]}"
	fi

	# Which daemons have been started?
	found_one=0
	for daemon_name in $DAEMONS; do
		eval daemon_prio=\$$daemon_name
		if [ "$daemon_prio" -gt 0 ]; then
			eval "daemon_inst=\${${daemon_name}_instances//,/ }"
			if [ -n "$daemon_inst" ]; then
				for inst in ${daemon_inst}; do
					eval "inst_disable=\${${daemon_name}_${inst}}"
					if [ -z ${inst_disable} ] || [ ${inst_disable} != 0 ]; then
						if check_daemon $daemon_name $inst; then
							watchfrr_options="$watchfrr_options ${daemon_name}-${inst}"
						fi
					fi
				done
			else
				if check_daemon $daemon_name; then
					watchfrr_options="$watchfrr_options $daemon_name"
				fi
			fi
			found_one=1
		fi
	done

	# Start if at least one daemon is activated.
	if [ $found_one -eq 1 ]; then
		start watchfrr
		echo "."
	fi
}

# Stopps watchfrr.
stop_watchfrr()
{
	echo -n "Stopping Frr monitor daemon:"
	stop watchfrr
	echo "."
}

# Stops all daemons that have a lower level of priority than the given.
# (technically if daemon_prio >= wanted_prio)
stop_prio()
{
	local wanted_prio
	local daemon_prio
	local daemon_list
	local daemon_inst
	local inst

	if [ -n "$2" ] && [[ "$2" =~ (.*)-(.*) ]]; then
		daemon=${BASH_REMATCH[1]}
		inst=${BASH_REMATCH[2]}
	else
		daemon="$2"
	fi

	wanted_prio=$1
	daemon_list=${daemon:-$DAEMONS}

	echo -n "Stopping Frr daemons (prio:$wanted_prio):"

	for prio_i in `seq 10 -1 $wanted_prio`; do
		for daemon_name in $daemon_list; do
			eval daemon_prio=\${${daemon_name}:0:3}
			daemon_inst=""
			if [ $daemon_prio -eq $prio_i ]; then
				eval "daemon_inst=\${${daemon_name}_instances//,/ }"
				if [ -n "$daemon_inst" ]; then
					for i in ${daemon_inst}; do
						if [ -n "$inst" ] && [ "$i" == "$inst" ]; then
							stop "$daemon_name" "$inst"
						elif [ x"$inst"  == x ]; then
							stop "$daemon_name" "$i"
						fi
					done
				else
					stop "$daemon_name"
				fi
			fi
		done
	done

	echo "."
	if [ -z "$inst" ]; then
		# Now stop other daemons that're prowling, coz the daemons file changed
		echo -n "Stopping other frr daemons"
		if [ -n "$daemon" ]; then
			eval "file_list_suffix="$V_PATH"/"$daemon*""
		else
			eval "file_list_suffix="$V_PATH/*""
		fi
		for pidfile in $file_list_suffix.pid; do
			PID=`cat $pidfile 2>/dev/null`
			${SSD} --stop --quiet --oknodo --pidfile "$pidfile"
			echo -n "."
			rm -rf "$pidfile"
		done
		echo "."

		echo -n "Removing remaining .vty files"
		for vtyfile in $file_list_suffix.vty; do
			rm -rf "$vtyfile"
		done
		echo "."
	fi
}

# Starts all daemons that have a higher level of priority than the given.
# (technically if daemon_prio <= wanted_prio)
start_prio()
{
	local wanted_prio
	local daemon_prio
	local daemon_list
	local daemon_name
	local daemon_inst
	local inst

	if [ -n "$2" ] && [[ "$2" =~ (.*)-(.*) ]]; then
		daemon=${BASH_REMATCH[1]}
		inst=${BASH_REMATCH[2]}
	else
		daemon="$2"
	fi

	wanted_prio=$1
	daemon_list=${daemon:-$DAEMONS}

	for prio_i in `seq 1 $wanted_prio`; do
		for daemon_name in $daemon_list; do
			eval daemon_prio=\$${daemon_name}
			daemon_inst=""
			if [ $daemon_prio -eq $prio_i ]; then
				eval "daemon_inst=\${${daemon_name}_instances//,/ }"
				if [ -n "$daemon_inst" ]; then
					if [ `echo "$daemon_inst" | wc -w` -gt ${MAX_INSTANCES} ]; then
						echo "Max instances supported is ${MAX_INSTANCES}. Aborting"
						exit 1
					fi
					# Check if we're starting again by switching from single instance
					# to MI version
					if started "$daemon_name"; then
						PIDFILE=`pidfile $daemon_name`
						${SSD} \
							--stop --quiet --oknodo \
							--pidfile "$PIDFILE" \
							--exec "$D_PATH/$daemon_name"

						rm -f `pidfile $1`
						rm -f `vtyfile $1`
					fi

					for i in ${daemon_inst}; do
						if [ -n "$inst" ] && [ "$i" == "$inst" ]; then
							start "$daemon_name" "$inst"
						elif [ x"$inst" == x ]; then
							start "$daemon_name" "$i"
						fi
					done
				else
					# Check if we're starting again by switching from
					# single instance to MI version
					eval "file_list_suffix="$V_PATH"/"$daemon_name-*""
					for pidfile in $file_list_suffix.pid; do
						${SSD} --stop --quiet --oknodo --pidfile "$pidfile"
						rm -rf "$pidfile"
					done
					for vtyfile in $file_list_suffix.vty; do
						rm -rf "$vtyfile"
					done

					start "$daemon_name"
				fi
			fi
		done
	done
}

check_status()
{
	local daemon_name
	local daemon_prio
	local daemon_inst
	local failed_status=0

	if [ -n "$1" ] && [[ "$1" =~ (.*)-(.*) ]]; then
		daemon=${BASH_REMATCH[1]}
		inst=${BASH_REMATCH[2]}
	else
		daemon="$1"
	fi

	daemon_list=${daemon:-$DAEMONS}

	# Which daemons have been started?
	for daemon_name in $daemon_list; do
		eval daemon_prio=\$$daemon_name
		if [ "$daemon_prio" -gt 0 ]; then
			eval "daemon_inst=\${${daemon_name}_instances//,/ }"
			if [ -n "$daemon_inst" ]; then
				for i in ${daemon_inst}; do
					if [ -n "$inst" -a "$inst" = "$i" ]; then
						started "$1" "log" || failed_status=$?
					elif [ -z "$inst" ]; then
						started "$daemon_name-$i" "log" || failed_status=$?
					fi
				done
			else
				started "$daemon_name" "log" || failed_status=$?
			fi
		fi
	done

	# All daemons that need to have been started are up and running
	return $failed_status
}

#########################################################
#               Main program                            #
#########################################################

# Config broken but script must exit silently.
[ ! -r "$C_PATH/daemons" ] && exit 0

# Load configuration
. "$C_PATH/daemons"
if [ -e "$C_PATH/daemons.conf" ]; then
	. "$C_PATH/daemons.conf"
fi

# Read configuration variable file if it is present
[ -r /etc/default/frr ] && . /etc/default/frr

if test -z "$frr_profile"; then
	# try to autodetect config profile
	if test -d /etc/cumulus; then
		frr_profile=datacenter
	# elif test ...; then
	# -- add your distro/system here
	elif test -n "$FRR_DEFAULT_PROFILE"; then
		frr_profile="$FRR_DEFAULT_PROFILE"
	fi
fi
test -n "$frr_profile" && frr_global_options="$frr_global_options -F $frr_profile"

MAX_INSTANCES=${MAX_INSTANCES:=5}

# Set priority of un-startable daemons to 'no' and substitute 'yes' to '0'
convert_daemon_prios

if [ ! -d $V_PATH ]; then
	echo "Creating $V_PATH"
	mkdir -p $V_PATH
	chownfrr $V_PATH
	chmod 755 /$V_PATH
fi

if [ -n "$3" ] && [ "$3" != "all" ]; then
	dmn="$2"-"$3"
elif [ -n "$2" ] && [ "$2" != "all" ]; then
	dmn="$2"
fi

case "$1" in
	start)
		# Try to load this necessary (at least for 2.6) module.
		if [ -d /lib/modules/`uname -r` ] ; then
			echo "Loading capability module if not yet done."
			set +e; LC_ALL=C modprobe -a capability 2>&1 | egrep -v "(not found|Can't locate)"; set -e
		fi

		# Start all daemons
		cd $C_PATH/
		if [ "$2" != "watchfrr" ]; then
			start_prio 10 $dmn
		fi
		start_watchfrr
		vtysh_b
		;;

	1|2|3|4|5|6|7|8|9|10)
		# Stop/start daemons for the appropriate priority level
		stop_prio $1
		start_prio $1
		vtysh_b
		;;

	stop|0)
		# Stop all daemons at level '0' or 'stop'
		stop_watchfrr
		if [ "$dmn" != "watchfrr" ]; then
			[ -n "${dmn}" ] && eval "${dmn/-/_}=0"
			stop_prio 0 $dmn
		fi

		if [ -n "$dmn" -a "$dmn" != "zebra" ]; then
			[ -n "$dmn" ] && eval "${dmn/-/_}=0"
			start_watchfrr
		fi
		;;

	reload)
		# Just apply the commands that have changed, no restart necessary
		if [ ! -x "$RELOAD_SCRIPT" ]; then
			echo "Please install frr-pythontools package. Required for reload"
			exit 0
		fi

		NEW_CONFIG_FILE="${2:-$C_PATH/frr.conf}"
		[ ! -r $NEW_CONFIG_FILE ] && echo "Unable to read new configuration file $NEW_CONFIG_FILE" && exit 1
		echo "Applying only incremental changes to running configuration from frr.conf"
		"$RELOAD_SCRIPT" --reload $C_PATH/frr.conf
		exit $?
		;;

	status)
		check_status $dmn
		exit $?
		;;

	restart|force-reload)
		$0 stop $dmn
		sleep 1
		$0 start $dmn
		;;

	*)
		echo "Usage: /etc/init.d/frr {start|stop|status|reload|restart|force-reload|<priority>} [daemon]"
		echo "       E.g. '/etc/init.d/frr 5' would start all daemons with a prio 1-5."
		echo "       reload applies only modifications from the running config to all daemons."
		echo "       reload neither restarts starts any daemon nor starts any new ones."
		echo "       Read /usr/share/doc/frr/README.Debian for details."
		exit 1
		;;
esac

echo "Exiting from the script"
exit 0