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#!/bin/bash
CONF_FILE=/root/config_svc.conf
#export DRY=echo # Dummy mode
export DRY=echo_log_run # Real mode
# Copyright 2016 Ludovic Pouzenc <ludovic@pouzenc.fr>
#
# This file is part of CHD Gestion.
#
# CHD Gestion is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# CHD Gestion is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with CHD Gestion. If not, see <http://www.gnu.org/licenses/>.
function main() {
# Init globals and work files
PROGNAME=$(basename $0)
BOOTTIME_TS=$(date +%s -d "$(uptime -s)")
> /etc/hosts.svc
> /etc/ethers.adt
# Apply each config line from CONF_FILE
while read line; do do_conf $line; done <$CONF_FILE
# Finalize setup
cat /etc/hosts.system /etc/hosts.svc > /etc/hosts
cat /etc/ethers.system /etc/ethers.adt > /etc/ethers
$DRY ip route flush cache
$DRY arp -f /etc/ethers
}
# do_conf is called for each internet access service to (un)route
function do_conf() {
svc_etat=$1 # Mandatory
svc_id=$2 # Mandatory
ip4_nexthop=$3 # Optionnal (if set, NAT will be used, else direct routing will be used to ip4_public)
ip4_public=$4 # Mandatory
ip6_nexthop=$5 # Optionnal
ip6_prefix=$6 # Optionnal
mac_nexthop=${7:--} # Optionnal
modified_ts=${8:--} # Optionnal (but important for cancel|suspend)
# FIXME sanity checks, code injection here
shift
dev=eth1
case $svc_etat in
active)
do_conf_enable $dev "$@" ;;
cancel|suspend)
do_conf_disable $dev "$@" ;;
esac
}
function do_conf_enable() {
dev=$1 # Mandatory (interface to join the user's router)
svc_id=$2 # Mandatory
ip4_nexthop=$3 # Optionnal (if set, NAT will be used, else direct routing will be used to ip4_public)
ip4_public=$4 # Mandatory
ip6_nexthop=$5 # Optionnal
ip6_prefix=$6 # Optionnal
mac_nexthop=${7:--} # Optionnal
modified_ts=${8:--} # Unused
# Keep track of all configured IP in hosts file for local DNS reverse resolutions
(
[ "$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 ${svc_id}.ip6
) >> /etc/hosts.svc
# Keep track of all routers MAC in ethers file to add static ARP entries on them
# This save broadcasts and helps about stolen or misconfigured WAN IPv4
if [ "$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
# IPv4 Internet -> adherent's router
if [ ${ip4_nexthop} = "-" ]
then # No NAT case
# Clean up nat in case we change from "with NAT" to "without NAT" situation
nat_cleanup $ip4_public
#IPv4 route setup
exists=$(ip route show $ip4_public/32 dev $dev | wc -l)
if [ "$exists" -ne 1 ]
then $DRY ip -4 route add $ip4_public/32 dev $dev
fi
else # With NAT case
nat_setup $ip4_nexthop $ip4_public
fi
# IPv6 Internet -> adherent's router
if [ $ip6_prefix != "-" -a $ip6_nexthop != "-" ]
then exists=$(ip -6 route show $ip6_prefix/56 dev $dev | wc -l)
if [ "$exists" -ne 1 ]
then $DRY ip -6 route replace $ip6_prefix/56 via $ip6_nexthop dev $dev
fi
fi
}
function do_conf_disable() {
dev=$1 # Mandatory (interface to join the user's router)
svc_id=$2 # Unused
ip4_nexthop=$3 # Unused
ip4_public=$4 # Mandatory
ip6_nexthop=$5 # Unused
ip6_prefix=$6 # Optionnal
mac_nexthop=${7:--} # Unused
modified_ts=${8:--} # Mandatory
# Defensive code even on madatory fields here, because of legacy data
if [ "$modified_ts" != "-" ]
then # system reboot flush all live routing config. Skip cleanup of older config entries
if [ $modified_ts -ge $BOOTTIME_TS ]
then
if [ "$ip4_public" != "-" ]
then nat_cleanup $ip4_public
exists=$(ip route show $ip4_public/32 dev $dev | wc -l)
if [ "$exists" -eq 1 ]
then $DRY ip -4 route delete $ip4_public/32 dev $dev
fi
fi
if [ $ip6_prefix != "-" ]
then exists=$(ip -6 route show $ip6_prefix/56 dev $dev | wc -l)
if [ "$exists" -eq 1 ]
then $DRY ip -6 route delete $ip6_prefix/56 dev $dev
fi
fi
fi
fi
}
function nat_setup() {
ip4_nexthop=$1
ip4_public=$2
ip addr show dev lo | grep -q "$ip4_public/32" || $DRY ip addr add $ip4_public/32 dev lo
# Remove PRE/POST old rules for the same ip4_public but wrong ip4_nexthop
# (happens if active service is updated, new equipement)
ruleno_pre=$(iptables -t nat -L PREROUTING -n --line-numbers | grep " $ip4_public " | grep -vE "to:$ip4_nexthop$" | cut -d' ' -f1 | head -n1)
[ -n "$ruleno_pre" ] && $DRY iptables -t nat -D PREROUTING $ruleno_pre
ruleno_post=$(iptables -t nat -L POSTROUTING -n --line-numbers | grep -E "to:$ip4_public$" | grep -v " $ip4_nexthop " | cut -d' ' -f1 | head -n1)
[ -n "$ruleno_post" ] && $DRY iptables -t nat -D POSTROUTING $ruleno_post
# Insert PRE/POST rules if not already there
iptables -t nat -L PREROUTING -n --line-numbers | grep -E "to:$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
}
function nat_cleanup() {
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 -D -q $ip4_public 2>&1 || true
fi
}
function echo_log_run() {
echo $@
logger -t "$PROGNAME" -- $@
$@
}
main
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