Subversion Repositories ALCASAR

#!/bin/bash

# alcasar-network.sh
# by Pierre RIVAULT and Rexy
# This script is distributed under the Gnu General Public License (GPL)

# Met à jour la configuration réseau conformément au fichier de configuration (alcasar.conf)
# update network configuration according to alcasar.conf

CONF_FILE="/usr/local/etc/alcasar.conf"
TMP_ip_gw_save="/tmp/ipset_ip_gw_save"
EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`
PUBLIC_IP=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`
GW1=`grep ^GW= $CONF_FILE|cut -d"=" -f2`
MTU=`grep ^PUBLIC_MTU= $CONF_FILE|cut -d"=" -f2`
MULTIWAN=`grep ^MULTIWAN= $CONF_FILE|cut -d"=" -f2`
MULTIWAN=${MULTIWAN:=off}
NET="`ipcalc -n $PUBLIC_IP | cut -d"=" -f2`/`ipcalc -p $PUBLIC_IP | cut -d"=" -f2`"
IP=`echo $PUBLIC_IP | cut -d"/" -f1`
PRIVATE_IP_MASK=`grep ^PRIVATE_IP $CONF_FILE | cut -d"=" -f2`
PRIVATE_IP=`echo $PRIVATE_IP_MASK | cut -d"/" -f1`
PRIVATE_NETMASK=`echo $PRIVATE_IP_MASK | cut -d"/" -f2`
PRIVATE_PREFIX=`/bin/ipcalc -p $PRIVATE_IP $PRIVATE_NETMASK |cut -d"=" -f2`             # prefixe du réseau (ex. 24)
PRIVATE_NETWORK=`/bin/ipcalc -n $PRIVATE_IP $PRIVATE_NETMASK| cut -d"=" -f2`    # @ réseau de consultation (ex.: 192.168.182.0)
PRIVATE_NETWORK_MASK=$PRIVATE_NETWORK/$PRIVATE_PREFIX                                                   # @ + masque du réseau de consult (192.168.182.0/24)
nb_gw=`grep ^WAN $CONF_FILE | wc -l`
routecmd="ip route replace default scope global"

if [ $(whoami) != "root" ]; then
        echo "You must be root to run this!" ; echo ; exit 1
fi

if [ $# -eq 0 ]; then
        args="--apply"
else
        args=$1
fi

case $args in
        --save) # save all the IP before changing the configuration
                rm -f $TMP_ip_gw_save
                gw_list="gw0"   # ipset name list for load_balancing
                for ((i=1 ; i<=$nb_gw ; i++)); do
                        gw_list="${gw_list} gw$i"
                done
                # Saving all of the already connected IP in order to put them back in the load balancing after
                for i in $gw_list;do
                        ipset list $i 1>/dev/null 2>&1
                        if [ $? -eq 0 ]
                        then
                                # the cut -d":" -f5 deletes all the lines with a :, i.e all the lines except the members
                                ipset list $i | grep -v ":" >> $TMP_ip_gw_save
                        fi
                done
        exit 0
        ;;
        --apply)
                [ -e /etc/sysconfig/network-scripts/ifcfg-$EXTIF ] && ifdown $EXTIF
                # set the new configuration for EXTIF
                cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-$EXTIF
DEVICE=$EXTIF
BOOTPROTO=static
IPADDR=$IP
NETMASK=`ipcalc -m $PUBLIC_IP | cut -d= -f2`
NETWORK=`ipcalc -n $PUBLIC_IP | cut -d= -f2`
GATEWAY=$GW1
DNS1=127.0.0.1
RESOLV_MODS=yes
ONBOOT=yes
METRIC=10
MII_NOT_SUPPORTED=yes
IPV6INIT=no
IPV6TO4INIT=no
ACCOUNTING=no
USERCTL=no
MTU=$MTU
NOZEROCONF=yes
EOF
                ifup $EXTIF
                ip route flush ${NET}   # Remove the previous route for the network of EXTIF
                ip route delete default scope global    # Remove the previous default route
                ip route add ${NET} dev ${EXTIF} src ${IP}       # Set the new route for EXTIF network
                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}`
                ip route add default via ${GW1} table 200
                routecmd="${routecmd} nexthop via ${GW1} dev ${EXTIF}"
                ip rule flush   # Remove the previous routing rules
                ip rule add from all lookup main pref 32766     # Set back the main rules
                ip rule add from all lookup default pref 32767  # Set back the default rules
                ip rule add from ${PRIVATE_NETWORK_MASK} fwmark 200 lookup 200  # Add the rule for the first gateway
                if [ "$MULTIWAN" == "on" ] || [ "$MULTIWAN" == "On" ]; then
                        nb_gw_supp=`grep ^WAN $CONF_FILE|wc -l`
                        for ((i=0 ; $i < $nb_gw_supp ; i++)); do
                                table=$(($i + 201))     # This number is used to mark the paquets in order to route them to the choosen GW 
                                GW=`grep ^WAN$(($i + 1))= $CONF_FILE|awk -F'"' '{ print $2 }' | awk -F, '{print $1}'`
                                ip route add ${NET} dev ${EXTIF} src ${IP} table $table # Add the others route in their respective tables
                                ip route add default via ${GW} table $table
                                ip rule add from ${PRIVATE_NETWORK_MASK} fwmark $table lookup $table    # Add the rule for each rule depending of the mark set by the firewall
                                routecmd="${routecmd} nexthop via ${GW} dev ${EXTIF}"   # add the added gateway into the default gateway
                        done
                fi
                ${routecmd}     # define the default gateway for outgoing traffic
                ip route flush cache
                exit 0
                ;;
        *)
                exit 1
                ;;
esac