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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-watchdog.sh 2841 2020-06-28 21:49:00Z rexy $
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# $Id: alcasar-watchdog.sh 2864 2020-10-18 09:06:17Z rexy $
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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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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="192.168.182.1"
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PRIVATE_IP=${PRIVATE_IP:=192.168.182.1}
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PRIVATE_IP="192.168.182.1"
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current_users_file="/tmp/current_users.txt"		# file containing active users with their "status.php" tab open
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current_users_file="/tmp/current_users.txt"		# file containing active users with their "status.php" tab open
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DIR_WEB="/var/www/html"
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DIR_WEB="/var/www/html"
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Index_Page="$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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	"2")
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	"2")
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		logger -t alcasar-watchdog "can't contact the default router"
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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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		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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		/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 -t alcasar-watchdog "can't resolv DNS queries"
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		echo "can't resolv DNS queries"
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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't resolv DNS queries\";?g" $Index_Page
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		;;
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	esac
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	esac
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	net_pb=`grep "network_pb = true;" $Index_Page|wc -l`
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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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	if [ $net_pb = "0" ] # user alert (only the first time)
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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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				then
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				then
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				LAN_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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	fi
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	fi
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	# DNS request testing
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	if [ $LAN_DOWN -eq "0" ]
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		then
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			dns_reply=`/usr/bin/host -W1 free.fr|grep SERVFAIL|wc -l`
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			if [ $dns_reply -eq "1" ]
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				then
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				LAN_DOWN="3"
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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 pb detected, users are warned
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	if [ $LAN_DOWN != "0" ]
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	if [ $LAN_DOWN != "0" ]
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		then
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		then
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			lan_down_alert
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			lan_down_alert
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	# else switch in normal mode
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	# else switch in normal mode