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#!/bin/bash
CONFFILE=/root/config_adt.bkp.sh
if [ $# -gt 0 ]
then export DRY=echo
fi
function nettoyage_nat() {
ip4_public=$1
ip addr show dev lo | grep -q "$ip4_public/32" && $DRY ip addr del $ip4_public/32 dev lo
deleted=0
ruleno_pre=$(iptables -t nat -L PREROUTING -n --line-numbers | grep " $ip4_public " | cut -d' ' -f1 | head -n1)
if [ -n "$ruleno_pre" ]
then $DRY iptables -t nat -D PREROUTING $ruleno_pre
deleted=1
fi
ruleno_post=$(iptables -t nat -L POSTROUTING -n --line-numbers | grep -E "to:$ip4_public$" | cut -d' ' -f1 | head -n1)
if [ -n "$ruleno_post" ]
then $DRY iptables -t nat -D POSTROUTING $ruleno_post
deleted=1
fi
if [ $deleted -eq 1 ]
then $DRY conntrack -L -q $ip4_public
fi
}
function activation_nat() {
ip4_nexthop=$1
ip4_public=$2
ip addr show dev lo | grep -q "$ip4_public/32" || $DRY ip addr add $ip4_public/32 dev lo
iptables -t nat -L PREROUTING -n --line-numbers | grep -E "to:$ip4_nexthop$" -q \
|| $DRY iptables -t nat -A PREROUTING -d $ip4_public -j DNAT --to-destination $ip4_nexthop
iptables -t nat -L POSTROUTING -n --line-numbers | grep " $ip4_nexthop " -q \
|| $DRY iptables -t nat -A POSTROUTING -s $ip4_nexthop -j SNAT --to-source $ip4_public
}
# Appelé pour chaque service à router
function do_conf() {
dev=eth1
svc_etat=$1
svc_id=$2
ip4_nexthop=$3
ip4_public=$4
ip6_nexthop=$5
ip6_prefix=$6
mac_nexthop=$7
# Référencer les IP du service en cours de configuration dans le fichiers hosts (résolutions DNS locales)
(
[ "$ip4_nexthop" != "-" ] && printf '%-22s %s\n' ${ip4_nexthop} ${svc_id}.nh4
[ "$ip6_nexthop" != "-" ] && printf '%-22s %s\n' ${ip6_nexthop} ${svc_id}.nh6
[ "$ip4_public" != "-" ] && printf '%-22s %s\n' ${ip4_public} ${svc_id}.ip4
[ "$ip6_prefix" != "-" ] && printf '%-22s %s\n' ${ip6_prefix}1 ${svc_id}.ip6
) >> /etc/hosts.adt
# Ajouter des entrées statiques dans /etc/ethers pour la table ARP (économie broadcast + changements IP WAN)
if [ "$mac_nexthop" != "-" -a "$mac_nexthop" != "" ]
then if [ "$ip4_nexthop" != "-" ]
then echo $mac_nexthop $ip4_nexthop >> /etc/ethers.adt
else if [ "$ip4_public" != "-" ]
then echo $mac_nexthop $ip4_public >> /etc/ethers.adt
fi
fi
fi
case $svc_etat in
actif)
# Cas CHD OpenWRT sans NAT
if [ ${ip4_nexthop} = "-" ]
then
echo $svc_id CHD no NAT
# Nettoyage NAT éventuel
nettoyage_nat $ip4_public
# CHD IPv4 Internet -> ADT
$DRY ip -4 route replace $ip4_public/32 dev $dev
# CHD IPv6 Internet -> ADT
if [ $ip6_prefix != "-" -a $ip6_nexthop != "-" ]
then $DRY ip -6 route replace $ip6_prefix/56 via $ip6_nexthop dev $dev
fi
else
# Cas CHD avec NAT (OpenWRT natté ou firmware TP-Link)
echo $svc_id CHD with NAT
# CHD IPv4 NAT Internet <-> ADT
activation_nat $ip4_nexthop $ip4_public
# CHD IPv6 Internet -> ADT
if [ $ip6_prefix != "-" -a $ip6_nexthop != "-" ]
then $DRY ip -6 route replace $ip6_prefix/56 via $ip6_nexthop dev $dev
fi
fi
;;
resilie)
echo "Attention, durant la migration les resilies sont a decabler manuellement"
echo "-> $*"
;;
esac
}
#function main() {
# Initialise
> /etc/hosts.adt
> /etc/ethers.adt
# Met en place la conf de chaque adherent
source $CONFFILE
# Finalise
cat /etc/hosts.system /etc/hosts.adt > /etc/hosts
cat /etc/ethers.system /etc/ethers.adt > /etc/ethers
$DRY ip route flush cache
$DRY arp -f /etc/ethers
exit 0
#}
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