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#!/bin/bash
# $Id: alcasar-dhcp.sh 2708 2019-03-05 23:17:43Z tom.houdayer $

# 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_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
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?^DHCP=.*?DHCP=off?g" $ALCASAR_CONF_FILE
                $SED "s?.*statip.*?statip\t\t$PRIVATE_NETWORK_MASK?g" $CHILLI_CONF_FILE
                $SED "s?^#nodynip.*?nodynip?g" $CHILLI_CONF_FILE
                $SED "s@^#\?dynip.*@#dynip@g" $CHILLI_CONF_FILE
                if [ -n "$EXT_DHCP_IP" ] && [ "$EXT_DHCP_IP" != "none" ]
                then
                        $SED "s?.*dhcpgateway\s.*?dhcpgateway\t$EXT_DHCP_IP?g" $CHILLI_CONF_FILE
                        $SED "s?.*dhcprelayagent.*?dhcprelayagent\t$RELAY_DHCP_IP?g" $CHILLI_CONF_FILE
                        $SED "s?.*dhcpgatewayport.*?dhcpgatewayport\t$RELAY_DHCP_PORT?g" $CHILLI_CONF_FILE
                else
                        $SED "s?.*dhcpgateway\s.*?#dhcpgateway\t\t$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?^DHCP=.*?DHCP=on?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
                $SED "s?^.*statip.*?#statip?g" $CHILLI_CONF_FILE
                $SED "s?^nodynip.*?#nodynip?g" $CHILLI_CONF_FILE
                $SED "s@^#\?dynip.*@dynip\t\t$PRIVATE_NETWORK_MASK@g" $CHILLI_CONF_FILE
                $SED "s?^dhcpgateway\s.*?#dhcpgateway\t$EXT_DHCP_IP?g" $CHILLI_CONF_FILE
                $SED "s?^dhcprelayagent.*?#dhcprelayagent\t$RELAY_DHCP_IP?g" $CHILLI_CONF_FILE
                $SED "s?^dhcpgatewayport.*?#dhcpgatewayport\t$RELAY_DHCP_PORT?g" $CHILLI_CONF_FILE
                /usr/bin/systemctl restart chilli
                ;;
        *)
                echo "Argument inconnu :$1";
                echo "$usage"
                exit 1
                ;;
esac