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#!/bin/bash
# $Id: alcasar-load_balancing.sh 2454 2017-12-09 18:59:31Z tom.houdayer $

# Generic Load balancer for multiple WAN links - version 1.1 (04 Feb 2011)
# (c) 2011 Pau Oliva Fora - http://pof.eslack.org
#
# Licensed under GPLv3 - for full terms see:
# http://www.gnu.org/licenses/gpl-3.0.html
#
# Adapted and debugged (adr et ping -S) by ALCASAR Team (3abtux@alcasar.net)
# (c) 2013  3abtux - http://www.alcasar.net
#
# Specify each WAN link in a separate column, example:
# In this example we have 3 wan links (vlanXXX interfaces) attached to a single
# physical interface because we use a vlan-enabled switch between the balancer
# machine and the ADSL routers we want to balance. The weight parameter should
# be kept to a low integer.
#
#
# Modified by ALCASAR team :


prog="alcasar-load_balancing.sh"
pidfile="/var/run/alcasar-load_balancing.pid"

###############################
# MAIN PARAMETERs Configuration
###############################

DIR_ETC="/usr/local/etc"
CONF_FILE="$DIR_ETC/alcasar.conf"
MULTIWAN=`grep MULTIWAN= $CONF_FILE|cut -d"=" -f2`
MULTIWAN=${MULTIWAN:=off}
FAILOVER=`grep FAILOVER= $CONF_FILE|cut -d"=" -f2`
FAILOVER=${FAILOVER:=30}
EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`                           # INTernal InterFace


# space separated list of public IPs to ping in watchdog mode
# set this to some public ip addresses pingable and always on.
TESTIPS="8.8.8.8 192.0.32.10"

# set to 1 when testing, set to 0 when happy with the results
VERBOSE=0

# CONFIGURATION ENDS HERE
###############################


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

# Adapter for ALCASAR project
CONF_FILE="/usr/local/etc/alcasar.conf"

# Virtual interfaces creating
function create_eth () {
        routecmd="ip route replace default scope global"
        NBIFACE=`grep "^WAN" $CONF_FILE | wc -l`        # Nbre interfaces virtuelles
        i=0
        while [ $i -le $NBIFACE ]
        do
                INT="WAN$i"
                echo $INT
                ACTIVE=`grep "$INT=" $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $1}'`     # Active
                WT=`grep "$INT=" $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $5}'`         # WEIGHT
                WT=${WT:-1}
                IP=`grep "$INT=" $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $3}' | cut -d"/" -f1` # @IP

                if [ $i -ne 0 ]; then
                        [ -e /etc/sysconfig/network-scripts/ifcfg-$EXTIF:$i ] && ifdown $EXTIF:$i && rm -f /etc/sysconfig/network-scripts/ifcfg-$EXTIF:$i
                        IFACE=`grep "$INT=" $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $2}'`      # IFACE
                        IP_NET=`grep "^$INT=" $CONF_FILE | awk -F'"' '{print $2}' | awk -F, '{ print $3}'`      # IP
                        NET="`ipcalc -n $IP_NET | cut -d"=" -f2`/`ipcalc -p $IP_NET|cut -d"=" -f2`"
                        GW=`grep "$INT=" $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $4}'`         # @GW
                        MTU=`grep "$INT=" $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $6}'`        # MTU

                        # Config $EXTIF:$i (Internet)
                        cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-$EXTIF:$i
DEVICE=$IFACE
BOOTPROTO=static
IPADDR=`echo $IP | cut -d"/" -f1`
NETMASK=`ipcalc -m $IP_NET | cut -d= -f2`
NETWORK=`ipcalc -n $IP_NET | cut -d= -f2`
MTU=$MTU
ONBOOT=yes
NOZEROCONF=yes
MII_NOT_SUPPORTED=yes
IPV6INIT=no
IPV6TO4INIT=no
ACCOUNTING=no
USERCTL=no
EOF
                        echo "ifup $EXTIF:$i"
                        ifup $EXTIF:$i
                        NET="`ipcalc -n $IP_NET | cut -d"=" -f2`/`ipcalc -p $IP_NET|cut -d"=" -f2`"
                else
                        IFACE="$EXTIF"
                        IP_NET=`grep "^PUBLIC_IP=" $CONF_FILE | awk -F'=' '{print $2}'`                 # IP/MSK
                        IP=`grep "^PUBLIC_IP=" $CONF_FILE | awk -F= '{ print $2 }' | cut -d"/" -f1`     # @IP
                        GW=`grep "^GW=" $CONF_FILE | awk -F= '{print $2}'`                              # @GW
#                       MTU=`grep "^PUBLIC_MTU=" $CONF_FILE | awk -F= '{print $2}'`                     # MTU
                fi # End

                NET="`ipcalc -n $IP_NET | cut -d"=" -f2`/`ipcalc -p $IP_NET|cut -d"=" -f2`"
                if [ "$PARAM" == "add" ]; then
                        set -x
                        table=$(($i + 1))
                        ip route ${PARAM} ${NET} dev ${IFACE} src ${IP} table $table
                        ip route ${PARAM} default via ${GW} table $table
                        ip rule ${PARAM} from ${IP} table $table
                        set +x
                fi
                echo "  Iface: ${IFACE}"
                echo "  IP: ${IP}"
                echo "  IP_NET: ${IP_NET}"
                echo "  NET: ${NET}"
                echo "  GW: ${GW}"
                echo "  Weight: ${WT}"
                echo "  MTU : ${MTU}"
                echo
                routecmd="${routecmd} nexthop via ${GW} dev ${IFACE} weight ${WT}"
                i=$(($i + 1))
        done # End While

        if [ "$PARAM" == "add" ]; then
                echo "[] Balanced routing:"
                # suppress default route
                ip route del default scope global
                set -x
                ${routecmd}
                set +x
                echo
        fi

} # end create_eth

###########################
# Fonction virtual Interfaces deleting
###########################
delete_eth () {
        IFACE_COUNT=`ls -l /etc/sysconfig/network-scripts/ifcfg-$EXTIF:* | wc -l`
        echo $IFACE_COUNT
        while [ $IFACE_COUNT -ne 0 ]
        do
                i=$IFACE_COUNT
                echo "ifdown $EXTIF:$i"
                ifdown $EXTIF:$i
                rm -f /etc/sysconfig/network-scripts/ifcfg-$EXTIF:$i
                IFACE_COUNT=$(($IFACE_COUNT - 1))
        done
        ip route del default scope global
#       ip route add default gw 192.168.1.1
}


# do not modify below this line unless you know what you're doing :)
function getvalue() {
        index=$1
        VAR=$2

        n=1
        for f in ${VAR} ; do
                if [ "${n}" == "${index}" ]; then
                        echo "$f"
                        break
                fi
                n=$(($n++))
        done
}

######################
# Fonction de FailOver
######################
function failover () {

        echo "[] Watchdog started"
        # 0 == all links ok, 1 == some link down
        STATE=0

        DOWNCOUNT_BAK=0
        DOWN_BAK=""
        NBIFACE=`grep "^WAN" $CONF_FILE | wc -l`        # Nbre interfaces virtuelles
        echo "Nombre interfaces =  "$NBIFACE
        WANIFACE[0]="$EXTIF"
        c=0
        while [ $c -le $NBIFACE ]; do
                ITH=(`grep "WAN$c=" $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $2}'`)     # IFACE
                echo $ITH
                WANIFACE="${WANIFACE} $ITH"
                echo $WANIFACE
                c=$(($c + 1))
        done
        echo "Liste des interfaces : "${WANIFACE[*]}
        # Failover test
        while : ; do

                if [ $VERBOSE -eq 1 ]; then
                        echo "[] Sleeping, state=$STATE"
                fi
                sleep $FAILOVER

                IFINDEX=1
                DOWN=""                 # liste des interfaces down
                DOWNCOUNT=0             # nombre d'interface down
                for iface in $WANIFACE ; do
                        COUNT=0         # compteur de test
                        FAIL=0          # Nombre de fois down
                        # Recup de l'adresse IP dynamiquement
                        IP=`ifconfig $iface |grep "inet adr" |cut -f 2 -d ":" |awk '{print $1}'`
                        if [ $i -ne 0 ]; then
                                GW=`grep "$iface," $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $4}'`               # @GW
                                WT=`grep "$iface," $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $5}'`               # @WT
                        else
                                GW=`grep "^GW=" $CONF_FILE | awk -F= '{print $2}'`                      # @GW
                        fi
                        for TESTIP in $TESTIPS ; do
                                COUNT=$(($COUNT + 1))
                                ping -W 3 -I $IP -c 1 $TESTIP > /dev/null 2>&1
#                               ping -W 3 -I $IP -c 1 $TESTIP
                                # Si ping de la première adresse --> ok  --> stop du test pour l'interface testée
                                if [ $? -eq 0 ]; then
                                        break
                                else
                                        # sinon on compte une erreur
                                        FAIL=$(($FAIL + 1))
                                fi
                        done # End of test sur un serveur Internet
                        # Affichage du nombre de down
                        echo "FAIL=$FAIL"
                        # Si nombre de fois down = nombre de tests -->  Iface down --> log dans fichier log avec l'heure
                        if [ $FAIL -eq $COUNT ]; then
                                echo "`date +%F-%Hh%mm%Ss` : [WARN] $iface is down!"
                                # Si etat différent de 1 (déjà tombé) --> changement de l'état général en default
                                if [ $STATE -ne 1 ]; then
                                        echo "Switching state $STATE -> 1"
                                        STATE=1
                                fi
                                # Rajout de l'iface dans la liste des interfaces down
                                DOWN="${DOWN} $IFINDEX"
                                echo "DOWN=$DOWN"
                                # Nombre d'interface down
                                DOWNCOUNT=$(($DOWNCOUNT + 1))
                                echo "DOWNCOUNT=$DOWNCOUNT"
                        fi
                        IFINDEX=$(($IFINDEX + 1))
                        echo "IFINDEX =$IFINDEX"
                done # End Test Interface in WANIFACE

                #  0 Passerelle down et état précédent différent (retour à la normale)) --> mise à la normale des passerelles
#               if [ $DOWNCOUNT -eq 0 ] && [ $DOWNCOUNT -ne $DOWNCOUNT_BAK ]; then
                if [ $DOWNCOUNT -eq 0 ] ; then
                        if [ $STATE -eq 1 ]; then
                                echo
                                echo "[] All links up and running :)"
                                set -x
                                ${routecmd}
                                set +x
                                # Changement de l'état en normal
                                STATE=0
                                echo "Switching state 1 -> 0"
                        fi # End retour etat normal
                        # if no interface is down, go to the next cycle
                        continue
                # cas ou au moins une passerelle down mais état identique au précédent Test --> rien à changer
                else
                        if [ "$DOWN_BAK" == "$DOWN" ]; then
                        echo "DOWN_BAK == DOWN = $DOWN"
                                continue        # --> état identique test precedent --> boucle suivante
                # cas ou au moins une passerelle down mais état différent de test précédent --> remplacement par nouvelle règle
                        else
                                cmd="ip route replace default scope global"
                                IFINDEX=1
                                suffix=""
                                # Pour chaque interface --> traitement et application de la règle de routage
                                for iface in $WANIFACE ; do
                                        echo "-------------------------"
                                        echo "iface=$iface"
                                        echo "Index = " $IFINDEX
                                        FAILIF=0
                                        # Pour chaque interface down -->
                                        echo "Interfaces DOWN = $DOWN"
                                        for lnkdwn in $DOWN ; do
                                                echo "LINKDOWN = "$lnkdown
                                                if [ $lnkdwn -eq $IFINDEX ]; then
                                                        FAILIF=1
                                                        break
                                                else
                                                        continue
                                                fi
                                        done # End linkdown in DOWN
                                        # Interface en etat normal --> rajout de la règle en mode nexthop
                                        if [ $FAILIF -eq 0 ]; then
                                                IP=`ifconfig $iface |grep "inet adr" |cut -f 2 -d ":" |awk '{print $1}'`
                                                if [ $iface != "$EXTIF" ]; then
                                                        GW=`grep "$iface," $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $4}'`               # @GW
                                                        WT=`grep "$iface," $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F, '{ print $5}'`               # @GW
                                                else
                                                        GW=`grep "^GW=" $CONF_FILE | awk -F= '{print $2}'`                      # @GW
                                                fi
                                                echo "GW=$GW"
                                                echo "WT=$WT"
                                                echo "suffix=$sufix"
                                                suffix="${suffix} nexthop via ${GW} dev ${iface} weight ${WT:-1}"
                                        fi # End interface = noFAIL
                                        IFINDEX=$(($IFINDEX + 1))
                                done # End  iface IN WANIFACE
                                # Commande globale
                                cmd="ip route replace default scope global $suffix"

                                if [ $VERBOSE -eq 1 ]; then
                                        set -x
                        #               echo "Avec commentaire : " ${cmd}
                                        ${cmd}
                                        set +x
                                        echo
                                else
                                        ${cmd} 2>/dev/null
                                        echo ${cmd}
                                fi # end Application de la commande de routage globale
                        fi #
                        DOWN_BAK=$DOWN  # Enregistrement de l'etat
                fi # End
        done
} # End of Failover


#################
# Main
#################

echo "[] Load balancer for multiple WAN interfaces - v2.1"
echo "[] (c) 2011 Pau Oliva Fora <pof> @eslack.org"
echo "[] (c) 2013 3abtux ALCASAR  <3abtux> @alcasar.net"
echo

case $1 in
        create)
                create_eth
        ;;
        delete)
                delete_eth
        ;;
        start)
                if [ "$MULTIWAN" != "on" ] && [ "$MULTIWAN" != "On" ]; then
                    echo "The MultiGateway is not activated !"
                    exit 0
                fi
                PARAM="add"
                create_eth
                ip route flush cache
                if [ $FAILOVER -eq 0 ]; then
                      echo "The MultiWAN Mode is actived but not failover connectivity !"
                      exit 0
                fi
                echo "Starting down $prog: "
                pid=`pidof -x "alcasar-load_balancing.sh"`
                if [ $pid != "" ]; then
                        echo $pid > $pidfile
                fi
                touch /var/lock/subsys/alcasar-load_balancing
                failover
        ;;
        stop)
                PARAM="del"
                echo "Shutting down $prog: "
                if [ -f $pidfile ]; then
                        pid=`cat $pidfile`
                        kill -9 $pid
                else
                        echo "$prog is not running."
                        exit 1
                fi
                RETVAL=$?
                echo
                [ $RETVAL -eq 0 ] && rm -f $pidfile && rm -f /var/lock/subsys/alcasar-load_balancing
                echo "Delete of virtual interfaces"
                delete_eth
                echo "Network restart"
                service network restart 2>&1 > /dev/null
                ip route

        ;;
        status)
                echo "Checking  $prog : "
                if [ -f $pidfile ]; then
                        pid=`cat $pidfile`
                        CHECK=`ps -p $pid --no-heading | awk {'printf $1'}`
                        if [ "$CHECK" = "" ]; then
                                echo "$prog is NOT running."
                        else
                                echo "$prog is running !"
                        fi
                else
                                echo "$prog is Not running."
                fi
        ;;
        fail)
                failover
        ;;
        *)
                echo "Usage: $0 [start|stop|status|create|delete]" ; echo ; exit 1
        ;;
esac

exit 0