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#!/bin/bash
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# $Id: alcasar-watchdog.sh 2537 2018-04-30 04:07:45Z tom.houdayer $
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# alcasar-watchdog.sh
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# by Rexy
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# This script is distributed under the Gnu General Public License (GPL)
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# - Ce script prévient les usagers de l'indisponibilité de l'accès Internet
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# - Il déconnecte les usagers dont les équipements réseau ne répondent plus (leur onglet 'status.php' a été fermé)
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# - Il deconnecte les usagers dont les adresses MAC sont usurpées
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#
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# - This script tells users that Internet access is down
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# - It logs out users whose PCs are quiet (their status tab is closed)
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# - It logs out users whose MAC address is used by other systems (usurped)
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CONF_FILE="/usr/local/etc/alcasar.conf"
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EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`			# EXTernal InterFace
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INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2`			# INTernal InterFace
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private_ip_mask=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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PRIVATE_IP=`echo "$private_ip_mask" |cut -d"/" -f1`		# @ip du portail (côté LAN)
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PRIVATE_IP=${PRIVATE_IP:=192.168.182.1}
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current_users_file="/var/tmp/havp/current_users.txt"		# file containing active users with their "status.php" tab open
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DIR_WEB="/var/www/html"
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Index_Page="$DIR_WEB/index.php"
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IPTABLES="/sbin/iptables"
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TUNIF="tun0"							# listen device for chilli daemon
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OLDIFS=$IFS
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IFS=$'\n'
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function lan_down_alert ()
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# users are redirected on ALCASAR IP address if a LAN problem is detected
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{
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	case $LAN_DOWN in
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	"1")
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		logger -t alcasar-watchdog "$EXTIF (WAN card) link down"
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		echo "$EXTIF (WAN card) link down"
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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"$EXTIF (WAN card) link down\";?g" $Index_Page
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		;;
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	"2")
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		logger -t alcasar-watchdog 'can't contact the default router'
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		echo "can't contact the default router"
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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't contact the default router\";?g" $Index_Page
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		;;
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	esac
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	net_pb=`grep "network_pb = true;" $Index_Page|wc -l`
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	if [ $net_pb = "0" ] # user alert (only the first time)
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		then
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		/bin/sed -i "s?^\$network_pb.*?\$network_pb = true;?g" $Index_Page
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		$IPTABLES -I PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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	fi
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}
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function lan_test ()
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# LAN connectiivity testing
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{
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	watchdog_process=`ps -C alcasar-watchdog.sh|wc -l`
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	if [[ $(expr $watchdog_process) -gt 3 ]]
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		then
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		echo "ALCASAR watchdog is already running"
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		exit 0
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	fi
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	# EXTIF testing
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	LAN_DOWN="0"
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	if [ `/sbin/ip link | grep $EXTIF|grep "NO-CARRIER" | wc -l` -eq "1" ]
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		then
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		LAN_DOWN="1"
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	fi
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	# Default GW testing
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	if [ $LAN_DOWN -eq "0" ]
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		then
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		IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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		arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
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		if [ $arp_reply -eq "0" ]
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			then
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			LAN_DOWN="2"
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		fi
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	fi
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	# if LAN pb detected, users are warned
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	if [ $LAN_DOWN != "0" ]
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		then
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			lan_down_alert
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	# else switch in normal mode
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	else
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		echo "Internet access is OK for now"
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		net_pb=`grep "network_pb = true;" $Index_Page|wc -l`
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		if [ $net_pb != "0" ]
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			then
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			/bin/sed -i "s?^\$network_pb.*?\$network_pb = false;?g" $Index_Page
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			$IPTABLES -D PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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		fi
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	fi
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}
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usage="Usage: alcasar-watchdog.sh {-lt --lan_test}"
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case $1 in
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	-\? | -h* | --h*)
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		echo "$usage"
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		exit 0
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		;;
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	-lt | --lan_test)
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		lan_test
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		exit 0
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		;;
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	*)
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		lan_test
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		# We disconnect inactive users (its means that their 'status.php' tab has been closed --> their ip address isn't in $current_users_file)
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		# process each equipment known by chilli to check if IP address is usurped (with arping)
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		for system in `/usr/sbin/chilli_query list | grep -v "0\.0\.0\.0"`
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		do
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			active_ip=`echo $system |cut -d" " -f2`
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			active_session=`echo $system |cut -d" " -f5`
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			active_mac=`echo $system | cut -d" " -f1`
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			active_user=`echo $system |cut -d" " -f6`
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			# We disconnect inactive user here :
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			# We check if the user isn't an auth @MAC and if he is still connected
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			if [ "$active_user" != "$active_mac" ] && [ $(expr $active_session) -eq 1 ]; then
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				if [ -e $current_users_file ]; then
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					# We check if user @IP is in 'current_users.txt'
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					cmp_user_ok=$(cat $current_users_file | awk -F':' "\$1 == \"$active_ip\" {print \$2}")
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					# If not we disconnect this user.
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					if [ -z "$cmp_user_ok" ]; then
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						logger -t alcasar-watchdog "$active_ip ($active_mac) can't be contact. We disconnects the user ($active_user)."
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						/usr/sbin/chilli_query logout $active_mac
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					elif [ "$cmp_user_ok" == "TEMP" ]; then
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						# Remove the user's IP from 'current_users.txt'. Every user need to insert their @IP everytime to prove their connectivity.
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						sed -i "/^$active_ip:$cmp_user_ok\$/d" $current_users_file
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					fi
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				else # "current_user.txt" does not exists. We disconnect every users.
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					logger -t alcasar-watchdog "The file /var/tmp/havp/current_users.txt doen't' exist. We disconnects the user $active_user"
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					/usr/sbin/chilli_query logout $active_mac
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				fi
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			fi
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			# IP usurpation test : process only equipment with an authenticated user
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			if [[ $(expr $active_session) -eq 1 ]]
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			then
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				arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $active_ip|grep -c "Unicast reply"`
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				# disconnect users whose equipement is usurped. For example, if there are 2 same @MAC it will make 2 lines in output.
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				if [[ $(expr $arp_reply) -gt 1 ]]
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					then 
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					echo "[$(date +"%Y-%m-%d %H:%M:%S")] : alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)." >> /var/Save/security/watchdog.log
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					logger -t alcasar-watchdog "$active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)."
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					/usr/sbin/chilli_query logout $active_mac
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					chmod 644 /var/Save/security/watchdog.log
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				fi
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			fi
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		done
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		;;
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esac
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IFS=$OLDIFS