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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 308 | richard | 1 | #!/bin/sh |
| 64 | franck | 2 | # $Id: alcasar-watchdog.sh 308 2010-10-25 22:17:29Z richard $ |
| 1 | root | 3 | # by rexy |
| 308 | richard | 4 | # Ce script prévient les usagers de l'indisponibilité de l'accès Internet |
| 5 | # il déconnecte les usagers dont |
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| 1 | root | 6 | # - les équipementis réseau ne répondent plus |
| 7 | # - les adresses MAC sont usurpées |
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| 308 | richard | 8 | # This script tells users that Internet access is down |
| 9 | # it logs out users whose |
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| 1 | root | 10 | # - PCs are quiet |
| 11 | # - MAC address are in used by other systems (usurped) |
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| 12 | |||
| 308 | richard | 13 | EXTIF="eth0" |
| 1 | root | 14 | INTIF="eth1" |
| 15 | PRIVATE_IP="192.168.182.1" |
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| 16 | tmp_file="/tmp/watchdog.txt" |
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| 308 | richard | 17 | Network_Pb_Page="/var/www/html/redirect/index-network-pb.php" |
| 1 | root | 18 | IFS=$'\n' |
| 308 | richard | 19 | |
| 20 | # Fonction appelée si un Pb de connectivité Internet |
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| 21 | # On fait pointer les usagers sur une page d'erreur |
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| 22 | function ext_down_alert () |
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| 23 | { |
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| 24 | case $EXT_DOWN in |
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| 25 | "1") |
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| 26 | logger "eth0 link down" |
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| 27 | /bin/sed -i "s?diagnostic =.*?diagnostic = eth0 link down?g" $Network_Pb_Page |
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| 28 | ;; |
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| 29 | "2") |
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| 30 | logger "can't contact the default router" |
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| 31 | /bin/sed -i "s?diagnostic =.*?diagnostic = can't contact the default router?g" $Network_Pb_Page |
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| 32 | ;; |
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| 33 | "3") |
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| 34 | logger "can't contact the Internet DNS" |
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| 35 | /bin/sed -i "s?diagnostic =.*?diagnostic = can't contact the Internet DNS?g" $Network_Pb_Page |
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| 36 | ;; |
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| 37 | esac |
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| 38 | net_pb=`cat /etc/dnsmasq.d/alcasar-dnsmasq.conf|grep "address=/#/"|wc -l` |
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| 39 | if [ $net_pb != "1" ] |
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| 40 | then |
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| 41 | rm -f /var/www/html/redirect/index.php |
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| 42 | ln -s /var/www/html/redirect/index-network-pb.php /var/www/html/redirect/index.php |
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| 43 | /bin/sed -i "s?^conf-dir=.*?address=\/#\/$PRIVATE_IP?g" /etc/dnsmasq.d/alcasar-dnsmasq.conf |
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| 44 | /etc/init.d/dnsmasq restart |
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| 45 | fi |
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| 46 | } |
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| 47 | |||
| 48 | # On teste la connectivité réseau |
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| 49 | # On teste l'état d'EXTIF |
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| 50 | EXT_DOWN="0" |
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| 51 | if [ "`/usr/sbin/ethtool $EXTIF|grep Link|cut -d' ' -f3`" != "yes" ] |
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| 52 | then |
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| 53 | EXT_DOWN="1" |
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| 54 | fi |
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| 55 | # si EXTIF ok, on teste la connectivité vers le routeur par défaut (Box FAI) |
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| 56 | if [ $EXT_DOWN -eq "0" ] |
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| 57 | then |
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| 58 | IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3` |
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| 59 | arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2` |
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| 60 | if [ $arp_reply -eq "0" ] |
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| 61 | then |
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| 62 | EXT_DOWN="2" |
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| 63 | fi |
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| 64 | fi |
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| 65 | # si routeur OK, on teste la connectivité vers les DNS externes |
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| 66 | # + tard (EXT_DOWN=3) |
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| 67 | # si Pb réseau, on avertit les usagers |
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| 68 | if [ $EXT_DOWN != "0" ] |
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| 69 | then |
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| 70 | ext_down_alert |
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| 71 | else |
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| 72 | # sinon, on rebascule en mode normal |
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| 73 | net_pb=`cat /etc/dnsmasq.d/alcasar-dnsmasq.conf|grep "address=/#/"|wc -l` |
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| 74 | if [ $net_pb -eq "1" ] |
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| 75 | then |
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| 76 | /bin/sed -i "s?^address=\/#\/.*?conf-dir=/usr/local/etc/alcasar-dnsfilter-enabled?g" /etc/dnsmasq.d/alcasar-dnsmasq.conf |
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| 77 | /etc/init.d/dnsmasq restart |
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| 78 | fi |
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| 79 | fi |
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| 1 | root | 80 | # lecture du fichier contenant les adresses IP des stations muettes |
| 81 | if [ -e $tmp_file ]; then |
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| 82 | cat $tmp_file | while read noresponse |
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| 83 | do |
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| 84 | noresponse_ip=`echo $noresponse | cut -d" " -f1` |
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| 85 | noresponse_mac=`echo $noresponse | cut -d" " -f2` |
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| 109 | richard | 86 | arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $noresponse_ip|grep response|cut -d" " -f2` |
| 1 | root | 87 | if [[ $(expr $arp_reply) -eq 0 ]] |
| 88 | then |
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| 18 | franck | 89 | logger "alcasar-watchdog $noresponse_ip ($noresponse_mac) reste muette. On déconnecte." |
| 1 | root | 90 | /usr/sbin/chilli_query logout $noresponse_mac |
| 91 | fi |
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| 92 | done |
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| 93 | rm $tmp_file |
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| 94 | fi |
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| 95 | # on traite chaque équipements connus de chilli |
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| 96 | for system in `/usr/sbin/chilli_query list` |
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| 97 | do |
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| 98 | active_ip=`echo $system |cut -d" " -f2` |
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| 99 | active_session=`echo $system |cut -d" " -f5` |
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| 100 | active_mac=`echo $system | cut -d" " -f1` |
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| 109 | richard | 101 | # on ne traite que les équipements exploitées par un usager authentifié (test de 2 réponses en 4 secondes) |
| 1 | root | 102 | if [[ $(expr $active_session) -eq 1 ]] |
| 103 | then |
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| 109 | richard | 104 | arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep response|cut -d" " -f2` |
| 1 | root | 105 | # on stocke les adresses IP des stations muettes |
| 106 | if [[ $(expr $arp_reply) -eq 0 ]] |
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| 107 | then |
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| 108 | echo "$active_ip $active_mac" >> $tmp_file |
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| 109 | fi |
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| 110 | # on deconnecte l'usager d'une stations usurpée (@MAC) |
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| 111 | if [[ $(expr $arp_reply) -gt 2 ]] |
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| 112 | then |
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| 18 | franck | 113 | logger "alcasar-watchdog : $active_ip est usurpée ($active_mac). On déconnecte." |
| 1 | root | 114 | /usr/sbin/chilli_query logout $active_mac |
| 115 | fi |
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| 116 | fi |
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| 117 | done |
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| 308 | richard | 118 |