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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-watchdog.sh 771 2011-11-16 21:20:42Z richard $
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# $Id: alcasar-watchdog.sh 783 2011-12-17 14:24:08Z richard $
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# alcasar-watchdog.sh
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# alcasar-watchdog.sh
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# by Richard REY
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# by Richard REY
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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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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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OLDIFS=$IFS
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OLDIFS=$IFS
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IFS=$'\n'
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IFS=$'\n'
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# Fonction appelée si un Pb de connectivité Internet
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# On fait pointer les usagers sur l'adresse locale
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function ext_down_alert ()
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function lan_down_alert ()
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# users are redirected on ALCASAR IP address if LAN Pb detected
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{
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{
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	case $EXT_DOWN in
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	case $LAN_DOWN in
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	"1")
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	"1")
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		logger "eth0 link down"
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		logger "eth0 link down"
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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"eth0 link down\";?g" $Index_Page
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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"eth0 link down\";?g" $Index_Page
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		;;
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		;;
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	"2")
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	"2")
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		logger "can't contact the default router"
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		logger "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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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't contact the default router\";?g" $Index_Page
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		;;
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		;;
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	"3")
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		logger "can't contact the Internet DNS"
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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't contact the Internet DNS\";?g" $Index_Page
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		;;
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	esac
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	esac
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	net_pb=`cat /etc/dnsmasq.conf|grep "address=/#/"|wc -l`
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	net_pb=`cat /etc/dnsmasq.conf|grep "address=/#/"|wc -l`
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	if [ $net_pb = "0" ] # on alerte les usagers (si ce n'est pas déjà le cas).
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	if [ $net_pb = "0" ] # on alerte les usagers (si ce n'est pas déjà le cas).
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		then
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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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		/bin/sed -i "s?^\$network_pb.*?\$network_pb = True;?g" $Index_Page
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		/bin/sed -i "1i\address=\/#\/$PRIVATE_IP" /etc/dnsmasq.conf
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		/bin/sed -i "1i\address=\/#\/$PRIVATE_IP" /etc/dnsmasq.conf
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		/etc/init.d/dnsmasq restart
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		/etc/init.d/dnsmasq restart
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	fi
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	fi
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}
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}
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- 
 
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function lan_test ()
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# On teste la connectivité réseau
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# LAN connectiivity testing
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{
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# On teste l'état d'EXTIF
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	# EXTIF testing
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EXT_DOWN="0"
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	LAN_DOWN="0"
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if [ "`/usr/sbin/ethtool $EXTIF|grep Link|cut -d' ' -f3`" != "yes" ]
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	if [ "`/usr/sbin/ethtool $EXTIF|grep Link|cut -d' ' -f3`" != "yes" ]
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	then
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		then
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	EXT_DOWN="1"
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		LAN_DOWN="1"
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fi
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	fi
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# si EXTIF ok, on teste la connectivité vers le routeur par défaut (Box FAI)
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	# Default GW testing
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if [ $EXT_DOWN -eq "0" ]
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	if [ $LAN_DOWN -eq "0" ]
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	then
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		then
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	IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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		IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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	arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
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		arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
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	if [ $arp_reply -eq "0" ]
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		if [ $arp_reply -eq "0" ]
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	       	then
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	       		then
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		EXT_DOWN="2"
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			LAN_DOWN="2"
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	fi
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		fi
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fi
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	fi
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# si routeur OK, on teste la connectivité vers les DNS externes
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# + tard (EXT_DOWN=3)
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# si Pb réseau, on avertit les usagers
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	# if LAN pb detected, users are warned
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if [ $EXT_DOWN != "0" ]
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	if [ $LAN_DOWN != "0" ]
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	then
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		then
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		ext_down_alert
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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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	else
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# sinon, le cas échéant, on rebascule en mode normal
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	net_pb=`cat /etc/dnsmasq.conf|grep "address=/#/"|wc -l`
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		net_pb=`cat /etc/dnsmasq.conf|grep "address=/#/"|wc -l`
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	if [ $net_pb != "0" ]
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		if [ $net_pb != "0" ]
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		then
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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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			/bin/sed -i "s?^\$network_pb.*?\$network_pb = False;?g" $Index_Page
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		/bin/sed -i "s?^address=\/#\/.*?conf-dir=/usr/local/etc/alcasar-dnsfilter-enabled?g" /etc/dnsmasq-blackhole.conf
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			/bin/sed -i "s?^address=\/#\/.*?conf-dir=/usr/local/etc/alcasar-dnsfilter-enabled?g" /etc/dnsmasq-blackhole.conf
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		/bin/sed -i "/^address=/d" /etc/dnsmasq.conf
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			/bin/sed -i "/^address=/d" /etc/dnsmasq.conf
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		/etc/init.d/dnsmasq restart
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			/etc/init.d/dnsmasq restart
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	fi
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		fi
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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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# lecture du fichier contenant les adresses IP des stations muettes
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# lecture du fichier contenant les adresses IP des stations muettes
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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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			logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user."
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					logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user."
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			/usr/sbin/chilli_query logout $active_mac
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					/usr/sbin/chilli_query logout $active_mac
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	fi
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				fi
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fi
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			fi
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done
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		done
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		;;
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esac
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IFS=$OLDIFS
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IFS=$OLDIFS