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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-watchdog.sh 1867 2016-05-04 12:22:08Z raphael.pion $
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# $Id: alcasar-watchdog.sh 2008 2016-07-25 09:00:46Z raphael.pion $
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# alcasar-watchdog.sh
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# alcasar-watchdog.sh
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# by Rexy
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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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# 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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# 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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# il déconnecte les usagers dont
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# - les équipements réseau ne répondent plus
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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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# - les adresses MAC sont usurpées
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# This script tells users that Internet access is down
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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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# it logs out users whose
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# - PCs are quiet
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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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# - MAC address is used by other systems (usurped)
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CONF_FILE="/usr/local/etc/alcasar.conf"
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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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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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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=`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_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=`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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PRIVATE_IP=${PRIVATE_IP:=192.168.182.1}
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tmp_file="/tmp/watchdog.txt"
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tmp_file="/tmp/watchdog.txt"
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tmp_users_file="/tmp/current_users.txt"
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DIR_WEB="/var/www/html"
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DIR_WEB="/var/www/html"
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Index_Page="$DIR_WEB/index.php"
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Index_Page="$DIR_WEB/index.php"
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IPTABLES="/sbin/iptables"
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IPTABLES="/sbin/iptables"
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TUNIF="tun0"						# listen device for chilli daemon
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TUNIF="tun0"						# listen device for chilli daemon
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OLDIFS=$IFS
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OLDIFS=$IFS
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		lan_test
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		lan_test
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		exit 0
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		exit 0
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		;;
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		;;
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	*)
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	*)
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		lan_test
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		lan_test
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		# read file that contains IP address of quiet equipments
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		# read file that contains IP address of user who are not in $tmp_users_file (its means that status.php has been closed)
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		if [ -e $tmp_file ]; then
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		if [ -e $tmp_file ]; then
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			cat $tmp_file | while read noresponse
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			cat $tmp_file | while read noresponse
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			do
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			do
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				noresponse_ip=`echo $noresponse | cut -d" " -f1`
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				noresponse_ip=`echo $noresponse | cut -d" " -f1`
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				noresponse_mac=`echo $noresponse | cut -d" " -f2`
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				noresponse_mac=`echo $noresponse | cut -d" " -f2`
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				noresponse_user=`echo $noresponse | cut -d" " -f3`
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				noresponse_user=`echo $noresponse | cut -d" " -f3`
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				arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $noresponse_ip|grep "Unicast reply"|wc -l`
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				data_user=$(/usr/sbin/chilli_query list | grep -v "\.0\.0\.0" | awk '$5 == 1' | grep $noresponse_ip)
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				if [[ $(expr $arp_reply) -eq 0 ]]
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				if [ $(echo $data_users | wc -l) -eq 1 ] #if it still connected ...
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	       				then
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	       			then
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					if [[ $noresponse_user == $noresponse_mac ]] #we let @mac auth equipments connected
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						then
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						#/usr/sbin/chilli_query dhcp-release $noresponse_mac # for @mac auth equipments, we must remove the arp entry
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					#on vide les ip inactifs de l'ipset not_auth_yet
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						echo "MAC authentification : $noresponse_mac (keep on connection)"
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					ipset del not_auth_yet $noresponse_ip
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					else #we disconnect user because status.php has been closed
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					logger "alcasar-watchdog $noresponse_ip ($noresponse_mac) can't be contact. Alcasar disconnects the user ($noresponse_user)."
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						logger "alcasar-watchdog $noresponse_ip ($noresponse_mac) can't be contact. Alcasar disconnects the user ($noresponse_user)."
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					/usr/sbin/chilli_query logout $noresponse_mac
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					if [[ $noresponse_user == $noresponse_mac ]] # for @mac auth equipments, we must remove the arp entry
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						echo "Disconnect : $noresponse_ip $noresponse_mac $noresponse_user"
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						then /usr/sbin/chilli_query dhcp-release $noresponse_mac
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						/usr/sbin/chilli_query logout $noresponse_mac
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					fi
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					fi
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				fi
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				fi
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			done
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			done
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			rm $tmp_file
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			rm $tmp_file
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			if [ -e $tmp_users_file ]; then
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				rm $tmp_users_file
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			fi
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		fi
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		#this temporary file contains every 'user IP address' which are connected to ALCASAR (status.php still open)
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		if [ -e $tmp_users_file ]; then
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			for ip_user in $(cat $tmp_users_file)
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			do
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				#Check if user is still connected
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				data_user=$(/usr/sbin/chilli_query list | grep -v "\.0\.0\.0" | awk '$5 == 1' | grep $ip_user)
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				if [ $(echo $data_users | wc -l) -eq 0 ] #if user not in the file $tmp_users_file  (it means that status.php has been closed)
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				then
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					#save info in tmp_file
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					active_ip=`echo $data_user |cut -d" " -f2`
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		                        active_mac=`echo $data_user | cut -d" " -f1`
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		                        active_user=`echo $data_user |cut -d" " -f6`
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					echo "$active_ip $active_mac $active_user" >> $tmp_file #save info for next time, user will be disconnected.
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				fi
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			done
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			rm $tmp_users_file
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		else
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			for system in $(/usr/sbin/chilli_query list |grep -v "\.0\.0\.0" | awk '$5 == 1')
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			do
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				#disconnect all users
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                                active_ip=`echo $system |cut -d" " -f2`
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                                active_mac=`echo $system | cut -d" " -f1`
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                                active_user=`echo $system |cut -d" " -f6`
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                                echo "$active_ip $active_mac $active_user" >> $tmp_file
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			done
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		fi
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		fi
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# process each equipment known by chilli
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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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		for system in `/usr/sbin/chilli_query list |grep -v "\.0\.0\.0"`
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		do
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		do
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			active_ip=`echo $system |cut -d" " -f2`
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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_session=`echo $system |cut -d" " -f5`
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			active_mac=`echo $system | cut -d" " -f1`
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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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			active_user=`echo $system |cut -d" " -f6`
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# process only equipment with an authenticated user
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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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			if [[ $(expr $active_session) -eq 1 ]]
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			then
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			then
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				arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep "Unicast reply"|wc -l`
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				arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep "Unicast reply"|wc -l`
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# store @IP of quiet equipments
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				if [[ $(expr $arp_reply) -eq 0 ]]
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   				then
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					echo "$active_ip $active_mac $active_user" >> $tmp_file
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- 
 
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				fi
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# disconnect users whose equipement is usurped (@MAC)
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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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				if [[ $(expr $arp_reply) -gt 2 ]]
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	       				then
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	       				then
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					echo "$(date "+[%x-%X] : ")alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)." >> /var/Save/security/watchdog.log
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					echo "$(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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					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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					/usr/sbin/chilli_query logout $active_mac