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#!/bin/bash -x
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##############################
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# Script Agregation de lien #
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# Gabriel CORGNE #
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##############################
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# Ajout marquage de packet pour SNAT
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# ac-creteil.fr Olivier Sauzet - Rachid Bouhassoun
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# le 10 Juin 2009
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[ -e /etc/agregation.conf ] || {
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# Pas de fichier de configuration
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echo "Fichier de configuration /etc/agregation.conf non trouvé"
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exit 1
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}
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. /etc/agregation.conf
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# Chargement de la bibliotheque Eole
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[ -x /usr/share/eole/FonctionsEoleNg ] || {
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echo "Pas de bibliotheque Eole !"
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exit 1
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}
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. /usr/share/eole/FonctionsEoleNg
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#Chargement des dicos
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. ParseDico
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#
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#Initialisation des variables d'etat
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# Dernier etat du lien
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LLS1=1
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LLS2=1
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# Dernier etat du host
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LHS1=1
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LHS2=1
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# Etat actuel du host
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CHS1=1
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CHS2=1
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# Le lien doit changer (O:oui , 1:non)
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CLS1=1
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CLS2=1
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# Nombre de changement d'etat
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COUNT1=0
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COUNT2=0
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# Nombre de serveurs DNS a tester
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ID1_C=${#DNS1[@]}
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ID2_C=${#DNS2[@]}
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# Nombre de mires a tester
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IM_C=${#MIRE[@]}
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# Calcul du coefficient pour iptables
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if [ -n "$W1" -a -n "$W2" ];then
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WCO=$[$[$W2*1000]/$[$W1+$W2]]
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fi
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# Fonction explicitant les messages d'etat
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expl() {
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if [ $1 -eq 0 ];then
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echo "actif"
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else
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echo "inactif"
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fi
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}
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# Fonction de Log dans /var/log/agregation.log + Zephir
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Aecho () {
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if [ -z "$2" ];then
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level="ERR"
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else
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level=$2
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fi
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DATE=`date +%Y-%m-%d_%H:%M:%S`
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echo "$DATE $1" >> /var/log/agregation.log
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[ "$level" != 'ERR' ] && echo "$1"
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Zephir "$level" "$1" agregation
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}
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#Mise à jour des routes $1=T1
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ipruleclear () {
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for r in `ip rule list|grep $1|awk '{print $2"-"$3"-"$4"-"$5"-"$6"-"$7}'`
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do ip rule del `echo $r|sed "s/-/ /g"`
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done
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}
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#Vidage des règles iptables de SNAT
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iptablessnatclear () {
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i=1
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while [ $i -le `/sbin/iptables -t nat -S POSTROUTING|wc -l` ]
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do
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if [ -n "`/sbin/iptables -t nat -S POSTROUTING $i|grep SNAT|grep "o eth0"`" ];then
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/sbin/iptables -t nat -D POSTROUTING $i
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else
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let i++
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fi
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done
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}
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#Vidage des règles iptables de MANGLE $1 = nom de la carte
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iptablesmangleclear () {
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i=1
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while [ "$i" -le `/sbin/iptables -t mangle -S PREROUTING|wc -l` ]
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do
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if [ -n "`/sbin/iptables -t mangle -S PREROUTING $i|grep "i $1"`" ];then
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/sbin/iptables -t mangle -D PREROUTING $i
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else
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let i++
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fi
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done
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}
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#Definition de la repartition par interface $1 = nom de la carte
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balance () {
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iptablesmangleclear $1
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network="$(eval echo \$adresse_network_$1)/$(eval echo \$adresse_netmask_$1)"
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#Si non NEW
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state ! --state NEW -j RESTOREMARK
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state ! --state NEW -j RETURN
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#Routes forcees
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for ip_force1 in ${FORCE1[@]}; do
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -d $ip_force1 -m state --state NEW -j T1
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -d $ip_force1 -m state --state NEW -j RETURN ; done
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for ip_force2 in ${FORCE2[@]}; do
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -d $ip_force2 -m state --state NEW -j T2
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -d $ip_force2 -m state --state NEW -j RETURN ; done
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#Si NEW et recent alors Tag puis RETURN
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -m recent --name T1 --update --rdest --seconds 3600 -j T1
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -m recent --name T1 --update --rdest --seconds 3600 -j RETURN
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -m recent --name T2 --update --rdest --seconds 3600 -j T2
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -m recent --name T2 --update --rdest --seconds 3600 -j RETURN
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#Si NEW sans recent alors Tag puis RETURN
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -j T2
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -m statistic --mode random --probability 0.$WCO -m recent --name T2 --set --rdest -j RETURN
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -m recent --name T1 --set --rdest -j T1
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}
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#Definition du flux par interface $1 = nom de la carte
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wan1 () {
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iptablesmangleclear $1
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network="$(eval echo \$adresse_network_$1)/$(eval echo \$adresse_netmask_$1)"
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#Si non NEW
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state ! --state NEW -j RESTOREMARK
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state ! --state NEW -j RETURN
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#Marques sur T1
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -j T1
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}
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#Definition du flux par interface $1 = nom de la carte
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wan2 () {
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iptablesmangleclear $1
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network="$(eval echo \$adresse_network_$1)/$(eval echo \$adresse_netmask_$1)"
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#Si non NEW
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state ! --state NEW -j RESTOREMARK
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state ! --state NEW -j RETURN
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#Marques sur T2
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/sbin/iptables -t mangle -A PREROUTING -i $1 -s $network -m state --state NEW -j T2
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}
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## Initialisation
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# Large recent table
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/sbin/modprobe ipt_recent ip_list_tot=4000
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# Declaration des tables iproute2
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cat > /etc/iproute2/rt_tables <<Eof
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# reserved values
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255 local
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254 main
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253 default
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0 unspec
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# local
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2 T2
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1 T1
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Eof
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# Vidage du cache
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/sbin/ip route flush cache
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# Chargement des regles de routage
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/sbin/ip route del default
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ipruleclear T1
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/sbin/ip rule add from $WAN1 table T1
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/sbin/ip route add $NET1 dev eth0 src $WAN1 table T1
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/sbin/ip route add default via $GW1 table T1
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/sbin/ip rule add fwmark 1 table T1
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ipruleclear T2
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/sbin/ip rule add from $WAN2 table T2
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/sbin/ip route add $NET2 dev eth0 src $WAN2 table T2
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/sbin/ip route add default via $GW2 table T2
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/sbin/ip rule add fwmark 2 table T2
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for ip_force1 in ${FORCE1[@]}; do /sbin/ip route add $ip_force1 via $GW1 table main ; done
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for ip_force2 in ${FORCE2[@]}; do /sbin/ip route add $ip_force2 via $GW2 table main ; done
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for ip_dns1 in ${DNS1[@]}; do /sbin/ip route add $ip_dns1 via $GW1 table main ; done
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for ip_dns2 in ${DNS2[@]}; do /sbin/ip route add $ip_dns2 via $GW2 table main ; done
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####################
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# test mode load balancing ou fail-over (actif/passif)
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if [ $ag_mode == "mode_lb" ] ; then
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/sbin/ip route delete default via $GW1 dev eth0
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/sbin/ip route delete default via $GW2 dev eth0
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/sbin/ip route add default scope global nexthop via $GW1 dev eth0 weight $W1 nexthop via $GW2 dev eth0 weight $W2
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fi
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if [ $ag_mode == "mode_fo" ] ;then
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if [ $ag_fo_etat_eth0 == "actif" ] && [ $ag_fo_etat_eth0_0 == "passif" ] ; then
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/sbin/ip route delete default
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/sbin/ip route add default via $GW1 dev eth0
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elif [ $ag_fo_etat_eth0 == "passif" ] && [ $ag_fo_etat_eth0_0 == "actif" ] ; then
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/sbin/ip route delete default
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/sbin/ip route add default via $GW2 dev eth0
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fi
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fi
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####################
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# Vidage des chaines MANGLE
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check_T1=$(iptables-save |grep "RESTOREMARK" |wc -l)
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check_T2=$(iptables-save |grep "T2" | wc -l)
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check_RESTOREMARK=$(iptables-save |grep "T1" |wc -l)
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check_PREROUTING=$(iptables-save |grep "T1" |wc -l)
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if [ "$check_PREROUTING" -gt "1" ] ; then
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/sbin/iptables -t mangle -F PREROUTING
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fi
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if [ "$check_T1" -gt "1" ] ; then
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/sbin/iptables -t mangle -F T1
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fi
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if [ "$check_T2" -gt "1" ] ; then
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/sbin/iptables -t mangle -F T2
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fi
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if [ "$check_RESTOREMARK" -gt "1" ] ; then
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/sbin/iptables -t mangle -F RESTOREMARK
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fi
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## creation de la chaine marquage pour agregation de lien
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chaine_T1=$(iptables-save | grep ":T1")
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if [ -z "$chaine_T1" ] ; then
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/sbin/iptables -t mangle -N T1
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/sbin/iptables -t mangle -A T1 -d 10.0.0.0/8 -j RETURN
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/sbin/iptables -t mangle -A T1 -d 172.16.0.0/12 -j RETURN
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/sbin/iptables -t mangle -A T1 -d 192.168.0.0/16 -j RETURN
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/sbin/iptables -t mangle -A T1 -d 161.48.0.0/19 -j RETURN
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/sbin/iptables -t mangle -A T1 -j MARK --set-mark 1
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/sbin/iptables -t mangle -A T1 -j CONNMARK --save-mark
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fi
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239
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chaine_T2=$(iptables-save | grep ":T2")
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if [ -z "$chaine_T1" ] ; then
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/sbin/iptables -t mangle -N T2
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/sbin/iptables -t mangle -A T2 -d 10.0.0.0/8 -j RETURN
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/sbin/iptables -t mangle -A T2 -d 172.16.0.0/12 -j RETURN
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/sbin/iptables -t mangle -A T2 -d 192.168.0.0/16 -j RETURN
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/sbin/iptables -t mangle -A T2 -d 161.48.0.0/19 -j RETURN
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/sbin/iptables -t mangle -A T2 -j MARK --set-mark 2
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/sbin/iptables -t mangle -A T2 -j CONNMARK --save-mark
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fi
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249
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chaine_RESTOREMARK=$(iptables-save | grep ":RESTOREMARK")
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250
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if [ -z "$chaine_RESTOREMARK" ] ; then
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251
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/sbin/iptables -t mangle -N RESTOREMARK
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252
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/sbin/iptables -t mangle -A RESTOREMARK -d 10.0.0.0/8 -j RETURN
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253
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/sbin/iptables -t mangle -A RESTOREMARK -d 172.16.0.0/12 -j RETURN
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254
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/sbin/iptables -t mangle -A RESTOREMARK -d 192.168.0.0/16 -j RETURN
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255
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/sbin/iptables -t mangle -A RESTOREMARK -d 161.48.0.0/19 -j RETURN
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256
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/sbin/iptables -t mangle -A RESTOREMARK -j CONNMARK --restore-mark
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257
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fi
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258
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259
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## Mise a jour des règles de SNAT
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260
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iptablessnatclear
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261
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/sbin/iptables -t nat -A POSTROUTING -o eth0 -m mark --mark 1 -j SNAT --to-source $WAN1
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262
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/sbin/iptables -t nat -A POSTROUTING -o eth0 -m mark --mark 2 -j SNAT --to-source $WAN2
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263
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264
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265
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# Test vers $MIRE sur le lien $L
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266
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Checkstate () {
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267
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268
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L=$1
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269
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#Nombre de serveurs DNS a tester
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270
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#ID_C=$(eval echo \${#DNS$L[@]})
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271
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ID=0
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272
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#Nombre de mires a tester
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273
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#IM_C=$(eval echo \${#MIRE$L[@]})
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274
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IM=0
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275
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SUCCES=1
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276
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while [ $IM -lt $IM_C ] && [ $SUCCES -eq 1 ] ; do
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277
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while [ "$ID" -lt $(eval echo \$ID$L\_C) ] && [ $SUCCES -eq 1 ] ; do
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278
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host -W $TIMEOUT ${MIRE[$IM]} $(eval echo \${DNS$L[$ID]})> /dev/null 2>&1
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279
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if [ $? -ne 0 ]; then
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280
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[ $(eval echo \$LLS$L) -eq 0 ] && Aecho "Erreur de resolution de $(eval echo \${MIRE[$IM]}) sur le dns $(eval echo \${DNS$L[$ID]}) du lien $L"
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281
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ID=$(( $ID + 1 ))
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282
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else
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283
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SUCCES=0
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284
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fi
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285
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done
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286
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IM=$(( $IM + 1 ))
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287
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ID=0
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288
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done
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289
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290
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if [ $SUCCES -eq 1 ]; then
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291
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Aecho "Le lien $L est tombe"
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292
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eval CHS$L=1
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293
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else
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294
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eval CHS$L=0
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295
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fi
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296
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if [ $(eval echo \$LHS$L) -ne $(eval echo \$CHS$L) ]; then
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297
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Aecho "L'etat du lien $L a change de $(expl $(eval echo \$LHS$L)) a $(expl $(eval echo \$CHS$L))"
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298
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eval COUNT$L=1
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299
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else
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300
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if [ $(eval echo \$LHS$L) -ne $(eval echo \$LLS$L) ]; then
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301
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eval COUNT$L=$(( $(eval echo \$COUNT$L) + 1 ))
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302
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fi
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303
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fi
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304
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if [[ $(eval echo \$COUNT$L) -ge $NBSUCCES || ($(eval echo \$LLS$L) -eq 0 && $(eval echo \$COUNT$L) -ge $NBECHECS) ]]; then
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305
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Aecho "Le lien $L n'est plus $(expl $(eval echo \$LLS$L))"
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306
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eval CLS$L=0
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307
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eval COUNT$L=0
|
|
308
|
if [ $(eval echo \$LLS$L) -eq "1" ]; then
|
|
309
|
eval LLS$L=0
|
|
310
|
else
|
|
311
|
eval LLS$L=1
|
|
312
|
fi
|
|
313
|
else
|
|
314
|
eval CLS$L=1
|
|
315
|
fi
|
|
316
|
|
|
317
|
eval LHS$L=$(eval echo \$CHS$L)
|
|
318
|
}
|
|
319
|
|
|
320
|
|
|
321
|
# Log du démarrage
|
|
322
|
Aecho "Initialisation de l'agregation de liens" 'MSG'
|
|
323
|
|
|
324
|
while : ; do
|
|
325
|
Checkstate 1
|
|
326
|
Checkstate 2
|
|
327
|
|
|
328
|
if [[ $CLS1 -eq 0 || $CLS2 -eq 0 ]]; then
|
|
329
|
|
|
330
|
if [[ $LLS1 -eq 1 && $LLS2 -eq 0 ]]; then
|
|
331
|
|
|
332
|
Aecho "Seul le lien 2 est actif, redirection des flux sur ce lien"
|
|
333
|
|
|
334
|
if [ "$ag_active_mail" == "oui" ] ; then
|
|
335
|
MssG="Seul le lien 2 est actif, redirection des flux sur ce lien"
|
|
336
|
SubJ="Liaison $nom_domaine_local_supp ($numero_etab)"
|
|
337
|
if [ -z "${CC[@]}" ] ; then
|
|
338
|
echo "$MssG"|mutt -s "$SubJ" "$DEST"
|
|
339
|
else
|
|
340
|
echo "$MssG"|mutt -s "$SubJ" "$DEST" -c "${CC[@]}"
|
|
341
|
fi
|
|
342
|
fi
|
|
343
|
|
|
344
|
# Iproute2 sur le lien2
|
|
345
|
/sbin/ip route replace default via $GW2 dev eth0
|
|
346
|
# bascule des destinations forcées (lien 1) sur le lien 2
|
|
347
|
for ip_force in ${FORCE1[@]} ; do
|
|
348
|
/sbin/ip route replace $ip_force via $GW2 dev eth0
|
|
349
|
done
|
|
350
|
# Mangle sur le lien2
|
|
351
|
wan2 eth1
|
|
352
|
[ $nombre_interfaces -ge 3 ] && wan2 eth2
|
|
353
|
[ $nombre_interfaces -ge 4 ] && wan2 eth3
|
|
354
|
[ $nombre_interfaces -eq 5 ] && wan2 eth4
|
|
355
|
|
|
356
|
elif [[ $LLS1 -eq 0 && $LLS2 -eq 1 ]]; then
|
|
357
|
Aecho "Seul le lien 1 est actif, redirection des flux sur ce lien"
|
|
358
|
|
|
359
|
if [ "$ag_active_mail" == "oui" ] ; then
|
|
360
|
MssG="Seul le lien 1 est actif, redirection des flux sur ce lien"
|
|
361
|
SubJ="Liaison $nom_domaine_local_supp ($numero_etab)"
|
|
362
|
if [ -z "${CC[@]}" ] ; then
|
|
363
|
echo "$MssG"|mutt -s "$SubJ" "$DEST"
|
|
364
|
else
|
|
365
|
echo "$MssG"|mutt -s "$SubJ" "$DEST" -c "${CC[@]}"
|
|
366
|
fi
|
|
367
|
fi
|
|
368
|
|
|
369
|
# Iproute2 sur le lien1
|
|
370
|
/sbin/ip route replace default via $GW1 dev eth0
|
|
371
|
# bascule des destinations forcées (lien 2) sur le lien 1
|
|
372
|
for ip_force in ${FORCE2[@]} ; do
|
|
373
|
/sbin/ip route replace $ip_force via $GW1 dev eth0
|
|
374
|
done
|
|
375
|
|
|
376
|
# Mangle sur lien1
|
|
377
|
wan1 eth1
|
|
378
|
[ $nombre_interfaces -ge 3 ] && wan1 eth2
|
|
379
|
[ $nombre_interfaces -ge 4 ] && wan1 eth3
|
|
380
|
[ $nombre_interfaces -eq 5 ] && wan1 eth4
|
|
381
|
|
|
382
|
elif [[ $LLS1 -eq 0 && $LLS2 -eq 0 ]]; then
|
|
383
|
Aecho "Rechargement de la repartition sur les 2 liens" 'MSG'
|
|
384
|
|
|
385
|
if [ "$ag_active_mail" == "oui" ] ; then
|
|
386
|
MssG="Rechargement de la repartition sur les 2 liens"
|
|
387
|
SubJ="Liaison $nom_domaine_local_supp ($numero_etab)"
|
|
388
|
if [ -z "${CC[@]}" ] ; then
|
|
389
|
echo "$MssG"|mutt -s "$SubJ" "$DEST"
|
|
390
|
else
|
|
391
|
echo "$MssG"|mutt -s "$SubJ" "$DEST" -c "${CC[@]}"
|
|
392
|
fi
|
|
393
|
fi
|
|
394
|
|
|
395
|
# Iproute si mode load balancing
|
|
396
|
if [ $ag_mode == "mode_lb" ] ; then
|
|
397
|
# Iproute2 sur les 2 liens
|
|
398
|
/sbin/ip route replace default proto static nexthop via $GW1 dev eth0 weight $W1 nexthop via $GW2 dev eth0 weight $W2
|
|
399
|
|
|
400
|
# retablit les destination forcees lien 1
|
|
401
|
for ip_force in ${FORCE1[@]} ; do
|
|
402
|
/sbin/ip route replace $ip_force via $GW1 dev eth0
|
|
403
|
done
|
|
404
|
# retablit les destination forcees lien 2
|
|
405
|
for ip_force in ${FORCE2[@]} ; do
|
|
406
|
/sbin/ip route replace $ip_force via $GW2 dev eth0
|
|
407
|
done
|
|
408
|
|
|
409
|
# Mangle sur les 2 liens
|
|
410
|
balance eth1
|
|
411
|
[ $nombre_interfaces -ge 3 ] && balance eth2
|
|
412
|
[ $nombre_interfaces -ge 4 ] && wan2 eth3
|
|
413
|
[ $nombre_interfaces -eq 5 ] && wan2 eth4
|
|
414
|
else
|
|
415
|
#mode fail-over
|
|
416
|
# retablit les destination forcees lien 1
|
|
417
|
for ip_force in ${FORCE1[@]} ; do
|
|
418
|
/sbin/ip route replace $ip_force via $GW1 dev eth0
|
|
419
|
done
|
|
420
|
# retablit les destination forcees lien 2
|
|
421
|
for ip_force in ${FORCE2[@]} ; do
|
|
422
|
/sbin/ip route replace $ip_force via $GW2 dev eth0
|
|
423
|
done
|
|
424
|
if [ $ag_fo_etat_eth0 == "actif" ] && [ $ag_fo_etat_eth0_0 == "passif" ] ; then
|
|
425
|
/sbin/ip route replace default via $GW1 dev eth0
|
|
426
|
elif [ $ag_fo_etat_eth0 == "passif" ] && [ $ag_fo_etat_eth0_0 == "actif" ] ; then
|
|
427
|
/sbin/ip route replace default via $GW2 dev eth0
|
|
428
|
fi
|
|
429
|
|
|
430
|
# Mangle sur les 2 liens
|
|
431
|
balance eth1
|
|
432
|
[ $nombre_interfaces -ge 3 ] && balance eth2
|
|
433
|
[ $nombre_interfaces -ge 4 ] && wan2 eth3
|
|
434
|
[ $nombre_interfaces -eq 5 ] && wan2 eth4
|
|
435
|
fi
|
|
436
|
|
|
437
|
fi
|
|
438
|
# rechargement des tunnels, plus utile en 2.3
|
|
439
|
#/usr/share/eole/magic-rvp &
|
|
440
|
fi
|
|
441
|
|
|
442
|
if [ $PAUSE -le 5 ];then
|
|
443
|
sleep 5
|
|
444
|
else
|
|
445
|
sleep $PAUSE
|
|
446
|
fi
|
|
447
|
done
|