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#!/bin/bash
# $Id: alcasar-dhcp.sh 2688 2019-01-18 23:15:49Z lucas.echard $

# alcasar-dhcp.sh

# by Rexy
# This script is distributed under the Gnu General Public License (GPL)

# active ou desactive le service DHCP sur le réseau de consultation
# enable or disable the DHCP service on consultation LAN

SED="/bin/sed -i"
CHILLI_CONF_FILE="/etc/chilli.conf"
ALCASAR_CONF_FILE="/usr/local/etc/alcasar.conf"

# define DHCP parameters (LAN side)
PRIVATE_IP_MASK=`grep ^PRIVATE_IP= $ALCASAR_CONF_FILE|cut -d"=" -f2`
PRIVATE_IP=`echo $PRIVATE_IP_MASK | cut -d"/" -f1`
PRIVATE_PREFIX=`/bin/ipcalc -p $PRIVATE_IP_MASK |cut -d"=" -f2`                         # network prefix (ie. 24)
PRIVATE_NETMASK=`/bin/ipcalc -m $PRIVATE_IP_MASK | cut -d"=" -f2`
PRIVATE_NETWORK=`/bin/ipcalc -n $PRIVATE_IP $PRIVATE_NETMASK| cut -d"=" -f2`
PRIVATE_PREFIX=`/bin/ipcalc -p $PRIVATE_IP $PRIVATE_NETMASK |cut -d"=" -f2`
PRIVATE_NETWORK_MASK=$PRIVATE_NETWORK/$PRIVATE_PREFIX                                   # ie.: 192.168.182.0/24
classe=$((PRIVATE_PREFIX/8)); classe_sup=`expr $classe + 1`; classe_sup_sup=`expr $classe + 2`          # ie.: 2=classe B, 3=classe C
PRIVATE_BROADCAST=`/bin/ipcalc -b $PRIVATE_NETWORK_MASK | cut -d"=" -f2`                # private network broadcast (ie.: 192.168.182.255)
private_network_ending=`echo $PRIVATE_NETWORK | cut -d"." -f$classe_sup`                # last octet of LAN address
private_broadcast_ending=`echo $PRIVATE_BROADCAST | cut -d"." -f$classe_sup`            # last octet of LAN broadcast
PRIVATE_FIRST_IP=`echo $PRIVATE_NETWORK | cut -d"." -f1-3`"."`expr $private_network_ending + 1`         # First network address (ex.: 192.168.182.1)
PRIVATE_LAST_IP=`echo $PRIVATE_BROADCAST | cut -d"." -f1-3`"."`expr $private_broadcast_ending - 1`      # last network address (ex.: 192.168.182.254)
PRIVATE_NETWORK_MASK=$PRIVATE_NETWORK/$PRIVATE_PREFIX
EXT_DHCP_IP=`grep ^EXT_DHCP_IP= $ALCASAR_CONF_FILE|cut -d"=" -f2`                               # Adresse du serveur DHCP externe
RELAY_DHCP_IP=`grep ^RELAY_DHCP_IP= $ALCASAR_CONF_FILE|cut -d"=" -f2`                   # Adresse de l'agent Relay : IP interne (défaut 192.168.182.1) dans le cas de DHCP dans le LAN de consultation
RELAY_DHCP_IP=${RELAY_DHCP_IP:=$PRIVATE_IP}                                             # IP externe (défaut x.y.z.t) dans le cas de DHCP du côté WAN
RELAY_DHCP_PORT=`grep ^RELAY_DHCP_PORT= $ALCASAR_CONF_FILE|cut -d"=" -f2`                       # Port de redirection vers le relay DHCP :  67 par défaut
RELAY_DHCP_PORT=${RELAY_DHCP_PORT:=67}

usage="Usage: alcasar-dhcp.sh {--on | -on} | {--off | -off} "
nb_args=$#
args=$1
if [ $nb_args -eq 0 ]
then
        echo "$usage"
        exit 1
fi
case $args in
        -\? | -h | --h)
                echo "$usage"
                exit 0
                ;;
        --off|-off) # disable DHCP service
                $SED "s?.*statip.*?statip\t\t$PRIVATE_NETWORK_MASK?g" $CHILLI_CONF_FILE
                $SED "s?^#nodynip.*?nodynip?g" $CHILLI_CONF_FILE
                $SED "s?^dynip.*?#dynip?g" $CHILLI_CONF_FILE
                $SED "s?^#dynip.*?#dynip?g" $CHILLI_CONF_FILE
                $SED "s?^DHCP.*?DHCP=off?g" $ALCASAR_CONF_FILE
                if [ "$EXT_DHCP_IP" != "none" ]
                then
                        $SED "s?.*dhcpgateway\t.*?dhcpgateway\t\t $EXT_DHCP_IP?g" $CHILLI_CONF_FILE
                        $SED "s?.*dhcprelayagent.*?dhcprelayagent\t\t$RELAY_DHCP_IP?g" $CHILLI_CONF_FILE
                        $SED "s?.*dhcpgatewayport.*?dhcpgatewayport\t\t$RELAY_DHCP_PORT?g" $CHILLI_CONF_FILE
                else
                        $SED "s?.*dhcpgateway\t.*?#dhcpgateway\t\t$EXT_DHCP_IP?g" $CHILLI_CONF_FILE
                        $SED "s?.*dhcprelayagent.*?#dhcprelayagent\t\t$RELAY_DHCP_IP?g" $CHILLI_CONF_FILE
                        $SED "s?.*dhcpgatewayport.*?#dhcpgatewayport\t\t$RELAY_DHCP_PORT?g" $CHILLI_CONF_FILE
                fi
                /usr/bin/systemctl restart chilli
                ;;
        --on|-on) # enable DHCP service on all range of IP addresses
                $SED "s?^.*statip.*?#statip?g" $CHILLI_CONF_FILE
                $SED "s?^nodynip.*?#nodynip?g" $CHILLI_CONF_FILE
                $SED "s?^DHCP.*?DHCP=on?g" $ALCASAR_CONF_FILE
                $SED "s?^dynip.*?dynip\t\t$PRIVATE_NETWORK_MASK?g" $CHILLI_CONF_FILE
                $SED "s?^#dynip.*?dynip\t\t$PRIVATE_NETWORK_MASK?g" $CHILLI_CONF_FILE
                $SED "s?^dhcpgateway\t.*?#dhcpgateway\t\t $EXT_DHCP_IP?g" $CHILLI_CONF_FILE
                $SED "s?^dhcprelayagent.*?#dhcprelayagent\t\t$RELAY_DHCP_IP?g" $CHILLI_CONF_FILE
                $SED "s?^dhcpgatewayport.*?#dhcpgatewayport\t\t$RELAY_DHCP_PORT?g" $CHILLI_CONF_FILE
                $SED "s?^EXT_DHCP_IP.*?EXT_DHCP_IP=$EXT_DHCP_IP?g" $ALCASAR_CONF_FILE
                $SED "s?^RELAY_DHCP_IP.*?RELAY_DHCP_IP=$RELAY_DHCP_IP?g" $ALCASAR_CONF_FILE
                $SED "s?^RELAY_DHCP_PORT.*?RELAY_DHCP_PORT=$RELAY_DHCP_PORT?g" $ALCASAR_CONF_FILE
                /usr/bin/systemctl restart chilli
                ;;
        *)
                echo "Argument inconnu :$1";
                echo "$usage"
                exit 1
                ;;
esac