#!/bin/sh
########################################################################
# Begin $rc_base/init.d/suricata
#
# Description : Suricata Initscript
#
# Author      : Stefan Schantl <stefan.schantl@ipfire.org>
#
# Version     : 01.00
#
# Notes       :
#
########################################################################

. /etc/sysconfig/rc
. ${rc_functions}

PATH=/usr/local/sbin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin; export PATH

eval $(/usr/local/bin/readhash /var/ipfire/suricata/settings)

# Name of the firewall chain.
FW_CHAIN="IPS"

# Optional options for the Netfilter queue.
NFQ_OPTS="--queue-bypass "

# Array containing the 4 possible network zones.
network_zones=( red green blue orange )

# Mark and Mask options.
MARK="0x2"
MASK="0x2"

# PID file of suricata.
PID_FILE="/var/run/suricata.pid"

case "$1" in
        start)
		# Get amount of CPU cores.
		NFQUEUES=
		CPUCOUNT=0
		while read line; do
			[ "$line" ] && [ -z "${line%processor*}" ] && NFQUEUES+="-q $CPUCOUNT " && ((CPUCOUNT++))
		done </proc/cpuinfo

		# Check if the IDS should be started.
		if [ "$ENABLE_IDS" == "on" ]; then
			# Loop through the array of network zones.
			for zone in "${network_zones[@]}"; do
				# Convert zone into upper case.
				zone_upper=${zone^^}

				# Generate variable name for checking if the IDS is
				# enabled on the zone.
				enable_ids_zone="ENABLE_IDS_$zone_upper"

				# Check if the IDS is enabled for this network zone.
				if [ "${!enable_ids_zone}" == "on" ]; then
					# Generate name of the network interface.
					network_device=$zone
					network_device+="0"

					# Assign NFQ_OPTS
					NFQ_OPTIONS=$NFQ_OPTS

					# Check if there are multiple cpu cores available.
					if [ "$CPUCOUNT" -gt "1" ]; then
						# Balance beetween all queues.
						NFQ_OPTIONS+="--queue-balance 0:"
						NFQ_OPTIONS+=$(($CPUCOUNT-1))
					else
						# Send all packets to queue 0.
						NFQ_OPTIONS+="--queue-num 0"
					fi

					# Create firewall rules to queue the traffic and pass to
					# the IDS.
					iptables -I "$FW_CHAIN" -i "$network_device" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
					iptables -I "$FW_CHAIN" -o "$network_device" -m mark ! --mark "$MARK"/"$MASK" -j NFQUEUE $NFQ_OPTIONS
				fi
			done

			# Start the IDS.
			boot_mesg "Starting Intrusion Detection System..."
			/usr/bin/suricata -c /etc/suricata/suricata.yaml -D $NFQUEUES
			evaluate_retval

			# Allow reading the pidfile.
			chmod 644 $PID_FILE
		fi
	;;

        stop)
		boot_mesg "Stopping Intrusion Detection System..."
		killproc -p $PID_FILE /var/run

		# Flush firewall chain.
		iptables -F $FW_CHAIN

		# Remove suricata control socket.              
		rm /var/run/suricata/* >/dev/null 2>/dev/null

		# Don't report returncode of rm if suricata was not started
		exit 0
        ;;
                
        status)
                statusproc /usr/bin/suricata
                ;;
                
        restart)
                $0 stop
                $0 start
                ;;
	reload)
		# Send SIGUSR2 to the suricata process to perform a reload
		# of the ruleset.
		kill -USR2 $(pidof suricata)
		;;
                
        *)
                echo "Usage: $0 {start|stop|restart|reload|status}"
                exit 1
                ;;
esac

chmod 644 /var/log/suricata/* 2>/dev/null

# End $rc_base/init.d/suricata