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#!/bin/bash
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# alcasar-network.sh
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# by Pierre RIVAULT and Rexy
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# This script is distributed under the Gnu General Public License (GPL)
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# Met à jour la configuration réseau conformément au fichier de configuration (alcasar.conf)
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# update network configuration according to alcasar.conf
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CONF_FILE="/usr/local/etc/alcasar.conf"
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TMP_ip_gw_save="/tmp/ipset_ip_gw_save"
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EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`
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PUBLIC_IP=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`
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GW1=`grep ^GW= $CONF_FILE|cut -d"=" -f2`
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MTU=`grep ^PUBLIC_MTU= $CONF_FILE|cut -d"=" -f2`
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MULTIWAN=`grep ^MULTIWAN= $CONF_FILE|cut -d"=" -f2`
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MULTIWAN=${MULTIWAN:=off}
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NET="`ipcalc -n $PUBLIC_IP | cut -d"=" -f2`/`ipcalc -p $PUBLIC_IP | cut -d"=" -f2`"
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IP=`echo $PUBLIC_IP | cut -d"/" -f1`
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PRIVATE_IP_MASK=`grep ^PRIVATE_IP $CONF_FILE | cut -d"=" -f2`
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PRIVATE_IP=`echo $PRIVATE_IP_MASK | cut -d"/" -f1`
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PRIVATE_NETMASK=`echo $PRIVATE_IP_MASK | cut -d"/" -f2`
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PRIVATE_PREFIX=`/bin/ipcalc -p $PRIVATE_IP $PRIVATE_NETMASK |cut -d"=" -f2` # prefixe du réseau (ex. 24)
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PRIVATE_NETWORK=`/bin/ipcalc -n $PRIVATE_IP $PRIVATE_NETMASK| cut -d"=" -f2` # @ réseau de consultation (ex.: 192.168.182.0)
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PRIVATE_NETWORK_MASK=$PRIVATE_NETWORK/$PRIVATE_PREFIX # @ + masque du réseau de consult (192.168.182.0/24)
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nb_gw=`grep ^WAN $CONF_FILE | wc -l`
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routecmd="ip route replace default scope global"
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if [ $(whoami) != "root" ]; then
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echo "You must be root to run this!" ; echo ; exit 1
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fi
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if [ $# -eq 0 ]; then
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args="--apply"
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else
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args=$1
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fi
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case $args in
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--save) # save all the IP before changing the configuration
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rm -f $TMP_ip_gw_save
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gw_list="gw0" # ipset name list for load_balancing
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for ((i=1 ; i<=$nb_gw ; i++)); do
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gw_list="${gw_list} gw$i"
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done
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# Saving all of the already connected IP in order to put them back in the load balancing after
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for i in $gw_list;do
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ipset list $i 1>/dev/null 2>&1
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if [ $? -eq 0 ]
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then
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# the cut -d":" -f5 deletes all the lines with a :, i.e all the lines except the members
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ipset list $i | grep -v ":" >> $TMP_ip_gw_save
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fi
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done
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exit 0
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;;
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--apply)
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[ -e /etc/sysconfig/network-scripts/ifcfg-$EXTIF ] && ifdown $EXTIF
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# set the new configuration for EXTIF
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cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-$EXTIF
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DEVICE=$EXTIF
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BOOTPROTO=static
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IPADDR=$IP
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NETMASK=`ipcalc -m $PUBLIC_IP | cut -d= -f2`
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NETWORK=`ipcalc -n $PUBLIC_IP | cut -d= -f2`
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GATEWAY=$GW1
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DNS1=127.0.0.1
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RESOLV_MODS=yes
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ONBOOT=yes
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METRIC=10
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MII_NOT_SUPPORTED=yes
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IPV6INIT=no
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IPV6TO4INIT=no
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ACCOUNTING=no
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USERCTL=no
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MTU=$MTU
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NOZEROCONF=yes
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EOF
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ifup $EXTIF
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ip route flush ${NET} # Remove the previous route for the network of EXTIF
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ip route delete default scope global # Remove the previous default route
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ip route add ${NET} dev ${EXTIF} src ${IP} # Set the new route for EXTIF network
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ip route add ${NET} dev ${EXTIF} src ${IP} table 200 # Set the new default route. If no multiwan, these lines are equivalent to `ip route add default via ${GW1}`
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ip route add default via ${GW1} table 200
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routecmd="${routecmd} nexthop via ${GW1} dev ${EXTIF}"
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ip rule flush # Remove the previous routing rules
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ip rule add from all lookup main pref 32766 # Set back the main rules
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ip rule add from all lookup default pref 32767 # Set back the default rules
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ip rule add from ${PRIVATE_NETWORK_MASK} fwmark 200 lookup 200 # Add the rule for the first gateway
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if [ "$MULTIWAN" == "on" ] || [ "$MULTIWAN" == "On" ]; then
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nb_gw_supp=`grep ^WAN $CONF_FILE|wc -l`
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for ((i=0 ; $i < $nb_gw_supp ; i++)); do
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table=$(($i + 201)) # This number is used to mark the paquets in order to route them to the choosen GW
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GW=`grep ^WAN$(($i + 1))= $CONF_FILE|awk -F'"' '{ print $2 }' | awk -F, '{print $1}'`
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ip route add ${NET} dev ${EXTIF} src ${IP} table $table # Add the others route in their respective tables
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ip route add default via ${GW} table $table
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ip rule add from ${PRIVATE_NETWORK_MASK} fwmark $table lookup $table # Add the rule for each rule depending of the mark set by the firewall
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routecmd="${routecmd} nexthop via ${GW} dev ${EXTIF}" # add the added gateway into the default gateway
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done
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fi
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${routecmd} # define the default gateway for outgoing traffic
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ip route flush cache
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exit 0
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;;
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*)
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exit 1
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;;
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esac
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