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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-watchdog.sh 2967 2021-07-08 09:47:39Z rexy $
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# $Id: alcasar-watchdog.sh 3008 2022-05-06 17:22:52Z 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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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`
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PRIVATE_IP=`echo $private_ip_mask |cut -d"/" -f1`
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PRIVATE_IP=${PRIVATE_IP:=192.168.182.1}
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PRIVATE_IP=${PRIVATE_IP:=192.168.182.1}
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MULTIWAN=`grep ^MULTIWAN= $CONF_FILE|cut -d"=" -f2`
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current_users_file="/tmp/current_users.txt"		# file containing active users with their "status.php" tab open
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current_users_file="/tmp/current_users.txt"		# file containing active users with their "status.php" tab open
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DIR_WEB="/var/www/html"
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DIR_WEB="/var/www/html"
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Index_Page="$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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		echo "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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		/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't resolv DNS queries\";?g" $Index_Page
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		;;
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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" ] # if previously up
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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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		$IPTABLES -I PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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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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	fi
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}
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}
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		then
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		then
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		GW_EXIST=`/sbin/ip route list|grep ^default|wc -l`
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		GW_EXIST=`/sbin/ip route list|grep ^default|wc -l`
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		if [ $GW_EXIST -eq "0" ] # no GW defined !
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		if [ $GW_EXIST -eq "0" ] # no GW defined !
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			then
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			then
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			systemctl restart network
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			systemctl restart network
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		else	
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		else
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			IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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			if [ "$MULTIWAN" == "off" ] || [ "$MULTIWAN" == "Off" ]
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			arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
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			if [ $arp_reply -eq "0" ]
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				then
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				then
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				IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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				arp_reply=`/usr/sbin/arping -I$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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					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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	fi
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	# DNS request testing (twice)
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	# DNS request testing (twice)
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	if [ $LAN_DOWN -eq "0" ]
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	if [ $LAN_DOWN -eq "0" ]
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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
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	else
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	else
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		echo "Internet access is OK for now"
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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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		net_pb=`grep "network_pb = true;" $Index_Page|wc -l`
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		if [ $net_pb != "0" ]
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		if [ $net_pb != "0" ] # if already down
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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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			$IPTABLES -D PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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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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	fi
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	fi