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richard |
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#!/bin/sh
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franck |
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# $Id: alcasar-watchdog.sh 597 2011-05-05 21:03:57Z richard $
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root |
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# by rexy
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richard |
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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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franck |
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# - les équipements réseau ne répondent plus
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root |
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# - les adresses MAC sont usurpées
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richard |
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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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# - PCs are quiet
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# - MAC address are in used by other systems (usurped)
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EXTIF="eth0"
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INTIF="eth1"
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PRIVATE_IP="192.168.182.1"
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tmp_file="/tmp/watchdog.txt"
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DIR_WEB="/var/www/html"
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Index_Page="$DIR_WEB/index.php"
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OLDIFS=$IFS
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root |
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IFS=$'\n'
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richard |
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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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richard |
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function ext_down_alert ()
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{
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case $EXT_DOWN in
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"1")
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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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;;
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"2")
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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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;;
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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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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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then
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/bin/sed -i "s?^\$network_pb.*?\$network_pb = True;?g" $Index_Page
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/bin/sed -i "s?^conf-dir=.*?address=\/#\/$PRIVATE_IP?g" /etc/dnsmasq-blackhole.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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fi
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}
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# On teste la connectivité réseau
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# On teste l'état d'EXTIF
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EXT_DOWN="0"
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if [ "`/usr/sbin/ethtool $EXTIF|grep Link|cut -d' ' -f3`" != "yes" ]
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then
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EXT_DOWN="1"
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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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if [ $EXT_DOWN -eq "0" ]
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then
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IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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arp_reply=`/usr/sbin/arping -I$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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EXT_DOWN="2"
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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 [ $EXT_DOWN != "0" ]
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then
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ext_down_alert
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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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if [ $net_pb != "0" ]
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richard |
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then
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richard |
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/bin/sed -i "s?^\$network_pb.*?\$network_pb = False;?g" $Index_Page
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richard |
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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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richard |
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/etc/init.d/dnsmasq restart
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fi
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fi
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root |
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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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cat $tmp_file | while read noresponse
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do
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noresponse_ip=`echo $noresponse | cut -d" " -f1`
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noresponse_mac=`echo $noresponse | cut -d" " -f2`
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richard |
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arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $noresponse_ip|grep response|cut -d" " -f2`
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root |
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if [[ $(expr $arp_reply) -eq 0 ]]
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then
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franck |
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logger "alcasar-watchdog $noresponse_ip ($noresponse_mac) reste muette. On déconnecte."
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root |
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/usr/sbin/chilli_query logout $noresponse_mac
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fi
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done
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rm $tmp_file
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fi
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# on traite chaque équipements connus de chilli
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richard |
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for system in `/usr/sbin/chilli_query list |grep -v "\.0\.0\.0"`
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root |
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do
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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_mac=`echo $system | cut -d" " -f1`
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richard |
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# on ne traite que les équipements exploitées par un usager authentifié (test de 2 réponses en 4 secondes)
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root |
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if [[ $(expr $active_session) -eq 1 ]]
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then
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richard |
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arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep response|cut -d" " -f2`
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root |
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# on stocke les adresses IP des stations muettes
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if [[ $(expr $arp_reply) -eq 0 ]]
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then
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echo "$active_ip $active_mac" >> $tmp_file
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fi
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# on deconnecte l'usager d'une stations usurpée (@MAC)
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if [[ $(expr $arp_reply) -gt 2 ]]
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then
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franck |
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logger "alcasar-watchdog : $active_ip est usurpée ($active_mac). On déconnecte."
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root |
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/usr/sbin/chilli_query logout $active_mac
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fi
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fi
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done
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richard |
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IFS=$OLDIFS
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