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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-watchdog.sh 2394 2017-08-27 13:28:59Z tom.houdayer $
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# $Id: alcasar-watchdog.sh 2454 2017-12-09 18:59:31Z tom.houdayer $
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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 les équipements réseau ne répondent plus (leur onglet 'status.php' a été fermé)
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# - Il déconnecte les usagers dont les équipements réseau ne répondent plus (leur onglet 'status.php' a été fermé)
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# - Il deconnecte les usagers dont les adresses MAC sont usurpées
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# - Il deconnecte les usagers dont les adresses MAC sont usurpées
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#
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#
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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 PCs are quiet (their status tab is closed)
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# - It logs out users whose PCs are quiet (their status tab is closed)
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# - It logs out users whose MAC address is used by other systems (usurped)
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# - It logs out users whose 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=${PRIVATE_IP:=192.168.182.1}
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current_users_file="/var/tmp/havp/current_users.txt"            # file containing active users with their "status.php" tab open
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current_users_file="/var/tmp/havp/current_users.txt"            # file containing active users with their "status.php" tab open
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DIR_WEB="/var/www/html"
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DIR_WEB="/var/www/html"
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Index_Page="$DIR_WEB/index.php"
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Index_Page="$DIR_WEB/index.php"
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IPTABLES="/sbin/iptables"
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IPTABLES="/sbin/iptables"
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TUNIF="tun0"                                                    # listen device for chilli daemon
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TUNIF="tun0"                                                    # listen device for chilli daemon
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OLDIFS=$IFS
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OLDIFS=$IFS
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IFS=$'\n'
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IFS=$'\n'
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function lan_down_alert ()
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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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# users are redirected on ALCASAR IP address if a LAN problem is detected
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{
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{
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        case $LAN_DOWN in
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        case $LAN_DOWN in
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        "1")
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        "1")
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                logger "$EXTIF (WAN card) link down"
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                logger "$EXTIF (WAN card) link down"
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                echo "$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" $Index_Page
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                /bin/sed -i "s?diagnostic =.*?diagnostic = \"$EXTIF (WAN card) 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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                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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        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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                $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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function lan_test ()
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function lan_test ()
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# LAN connectiivity testing
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# LAN connectiivity testing
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{
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{
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        watchdog_process=`ps -C alcasar-watchdog.sh|wc -l`
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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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        if [[ $(expr $watchdog_process) -gt 3 ]]
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                then
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                then
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                echo "ALCASAR watchdog is already running"
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                echo "ALCASAR watchdog is already running"
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                exit 0
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                exit 0
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        fi
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        fi
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        # EXTIF testing
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        # EXTIF testing
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        LAN_DOWN="0"
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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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        if [ `/sbin/ip link | grep $EXTIF|grep "NO-CARRIER" | wc -l` -eq "1" ]
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                then
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                then
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                LAN_DOWN="1"
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                LAN_DOWN="1"
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        fi
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        fi
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        # Default GW testing
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        # Default GW testing
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        if [ $LAN_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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                        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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        # 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
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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" ]
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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
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}
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}
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usage="Usage: alcasar-watchdog.sh {-lt --lan_test}"
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usage="Usage: alcasar-watchdog.sh {-lt --lan_test}"
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case $1 in
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case $1 in
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        -\? | -h* | --h*)
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        -\? | -h* | --h*)
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                echo "$usage"
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                echo "$usage"
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                exit 0
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                exit 0
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                ;;
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                ;;
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        -lt | --lan_test)
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        -lt | --lan_test)
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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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                # We disconnect inactive users (its means that their 'status.php' tab has been closed --> their ip address isn't in $current_users_file)
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                # We disconnect inactive users (its means that their 'status.php' tab has been closed --> their ip address isn't in $current_users_file)
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                # process each equipment known by chilli to check if IP address is usurped (with arping)
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                # process each equipment known by chilli to check if IP address is usurped (with arping)
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                for system in `/usr/sbin/chilli_query list | grep -v "0\.0\.0\.0"`
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                for system in `/usr/sbin/chilli_query list | grep -v "0\.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 $system |cut -d" " -f6`
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                        # We disconnect inactive user here :
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                        # We disconnect inactive user here :
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                        # We check if this is not an auth @MAC and if he is still connected
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                        # We check if this is not an auth @MAC and if he is still connected
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                        if [ "$active_user" != "$active_mac" ] && [ $(expr $active_session) -eq 1 ]; then
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                        if [ "$active_user" != "$active_mac" ] && [ $(expr $active_session) -eq 1 ]; then
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                                if [ -e $current_users_file ]; then
117
                                if [ -e $current_users_file ]; then
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                                        # We check if user @IP is in 'current_users.txt'
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                                        # We check if user @IP is in 'current_users.txt'
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                                        cmp_user_ok=$(cat $current_users_file | awk -F':' "\$1 == \"$active_ip\" {print \$2}")
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                                        cmp_user_ok=$(cat $current_users_file | awk -F':' "\$1 == \"$active_ip\" {print \$2}")
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                                        # If not we disconnect this user.
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                                        # If not we disconnect this user.
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                                        if [ -z "$cmp_user_ok" ]; then
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                                        if [ -z "$cmp_user_ok" ]; then
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                                                logger "alcasar-watchdog : $active_ip ($active_mac) can't be contact. We disconnects the user ($active_user)."
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                                                logger "alcasar-watchdog : $active_ip ($active_mac) can't be contact. We disconnects the user ($active_user)."
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                                                /usr/sbin/chilli_query logout $active_mac
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                                                /usr/sbin/chilli_query logout $active_mac
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                                        elif [ "$cmp_user_ok" == "TEMP" ]; then
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                                        elif [ "$cmp_user_ok" == "TEMP" ]; then
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                                                # Remove the user's IP from 'current_users.txt'. Every user need to insert their @IP everytime to prove their connectivity.
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                                                # Remove the user's IP from 'current_users.txt'. Every user need to insert their @IP everytime to prove their connectivity.
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                                                sed -i "/^$active_ip:$cmp_user_ok\$/d" $current_users_file
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                                                sed -i "/^$active_ip:$cmp_user_ok\$/d" $current_users_file
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                                        fi
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                                        fi
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                                else # "current_user.txt" does not exists. We disconnect every users.
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                                else # "current_user.txt" does not exists. We disconnect every users.
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                                        logger "alcasar-watchdog : The file /var/tmp/havp/current_users.txt doen't' exist. We disconnects the user $active_user"
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                                        logger "alcasar-watchdog : The file /var/tmp/havp/current_users.txt doen't' exist. We disconnects 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
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                                fi
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                                fi
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                        fi
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                        fi
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                        # IP usurpation test : process only equipment with an authenticated user
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                        # IP usurpation test : process only equipment with an authenticated user
134
                        if [[ $(expr $active_session) -eq 1 ]]
134
                        if [[ $(expr $active_session) -eq 1 ]]
135
                        then
135
                        then
136
                                arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $active_ip|grep -c "Unicast reply"`
136
                                arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $active_ip|grep -c "Unicast reply"`
137
                                # disconnect users whose equipement is usurped. For example, if there are 2 same @MAC it will make 2 lines in output.
137
                                # disconnect users whose equipement is usurped. For example, if there are 2 same @MAC it will make 2 lines in output.
138
                                if [[ $(expr $arp_reply) -gt 1 ]]
138
                                if [[ $(expr $arp_reply) -gt 1 ]]
139
                                        then
139
                                        then
140
                                        echo "$(date "+[%x-%X] : ")alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)." >> /var/Save/security/watchdog.log
140
                                        echo "$(date "+[%x-%X] : ")alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)." >> /var/Save/security/watchdog.log
141
                                        logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)."
141
                                        logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)."
142
                                        /usr/sbin/chilli_query logout $active_mac
142
                                        /usr/sbin/chilli_query logout $active_mac
143
                                        chmod 644 /var/Save/security/watchdog.log
143
                                        chmod 644 /var/Save/security/watchdog.log
144
                                fi
144
                                fi
145
                        fi
145
                        fi
146
                done
146
                done
147
                ;;
147
                ;;
148
esac   
148
esac
149
IFS=$OLDIFS
149
IFS=$OLDIFS
150
 
150