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1535 richard 1
#!/bin/bash
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# $Id: alcasar-watchdog.sh 2107 2017-01-05 22:23:35Z raphael.pion $
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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
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# - les équipements réseau ne répondent plus ( si la fenetre status.php a été fermé. Les autorisations par adresse mac sont laissé de côté)
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# - les adresses MAC sont usurpées
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# This script tells users that Internet access is down
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# it logs out users whose 
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# - PCs are quiet (it means that status.php has been closed. We put aside @MAC Authorization )
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# - 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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tmp_file="/tmp/watchdog.txt"
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current_users_file="/tmp/current_users.txt"
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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 $LAN_DOWN in
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	"1")
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		logger "$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 "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 status.php has been closed)
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		# Each user inform about his connectivity by filling in /tmp/current_users.txt his own @IP
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		# process each equipment known by chilli to check if any equipment is usurped (@MAC)
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		for system in `/usr/sbin/chilli_query list |grep -v "\.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 $system |cut -d" " -f6`
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			#We disconnect inactive user here :
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			#We check if this is not an auth @MAC and if he is still connected
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			if [ "$active_user" != "$active_mac" ] && [ $(echo $system | awk '$5 == 1' | wc -c) -gt 1 ]; then
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				# If /tmp/current_user.txt exists ...
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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 | grep $active_ip | wc -w)
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					# If this @IP is not in this file, we disconnect this user.
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					if [ $cmp_user_ok -eq 0 ]; then
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						logger "alcasar-watchdog $active_ip ($active_mac) can't be contact. Alcasar disconnects the user ($active_user)."
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						echo "Disconnect : $active_ip $active_mac $active_user"
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						/usr/sbin/chilli_query logout $active_mac
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					fi
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					# We clean 'current_users.txt'. Every user need to inform their @IP everytime to prove thier connectivity.
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					sed -i 'd' $current_users_file
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				else # If /tmp/current_user.txt does not exists we disconnect every users.
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					logger "Le fichier /tmp/current_users.txt n'existe pas."
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					logger "alcasar-watchdog $active_ip ($active_mac) can't be contact. Alcasar disconnects the user ($active_user)."
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					echo "Disconnect : $active_ip $active_mac $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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			# 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 -c2 -w4 $active_ip|grep "Unicast reply"|wc -l`
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				# disconnect users whose equipement is usurped (@MAC). For example, if there are 2 same @MAC it will make 3 lines in output.
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				if [[ $(expr $arp_reply) -gt 2 ]]
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	       				then 
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					echo "$(date "+[%x-%X] : ")alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)." >> /var/Save/security/watchdog.log
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					logger "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
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