Subversion Repositories ALCASAR

#!/bin/bash

# $Id: alcasar-dns-local.sh 2838 2020-06-21 22:15:26Z rexy $

# alcasar-dns-local.sh

# by Rexy - 3abtux

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

# active ou desactive la redirection du service DNS sur le réseau de consultation

# enable or disable the redirector of internal DNS service on consultation LAN

SED="/bin/sed -i"

ALCASAR_CONF_FILE="/usr/local/etc/alcasar.conf"

LOCAL_DOMAIN_CONF_FILE="/etc/unbound/conf.d/common/local-forward/dns-redirector.conf"

LOCAL_HOSTNAME_FILE="/etc/hosts"

# define DNS parameters (LAN side)

INT_DNS_DOMAIN=`grep ^DOMAIN $ALCASAR_CONF_FILE|cut -d"=" -f2`

INT_DNS_HOST=`grep ^HOSTNAME $ALCASAR_CONF_FILE|cut -d"=" -f2`

INT_DNS_IP_MASK=`grep ^PRIVATE_IP $ALCASAR_CONF_FILE|cut -d"=" -f2`

INT_DNS_IP=`grep ^PRIVATE_IP $ALCASAR_CONF_FILE|cut -d"=" -f2|cut -d"/" -f1`

INTIF=`grep ^INTIF $ALCASAR_CONF_FILE|cut -d"=" -f2`

INT_DNS_ACTIVE=`grep INT_DNS_ACTIVE $ALCASAR_CONF_FILE|cut -d"=" -f2`

LOCAL_DNS_FILE="/etc/unbound/conf.d/common/local-dns/$INTIF.conf"

LOCAL_DNS_BLACKHOLE_FILE="/etc/unbound/conf.d/blackhole/iface.$INTIF.conf"

usage="Usage: alcasar-dns-local.sh {--on | -on} | {--off | -off} | {--add | -add} ip domain | {--del | -del} ip domain | {--reload | -reload}"

nb_args=$#

args=$1

if [ $nb_args -eq 0 ]

then

	echo "$usage"

	exit 1

fi

function restart_dns(){

	for dns in unbound unbound-blacklist unbound-whitelist dnsmasq-whitelist unbound-blackhole

	do

		systemctl restart $dns

	done

}

function hosts_to_unbound(){  # configure the unbound conf file with local host names resolution (forward + blackhole)

		cat << EOF > $LOCAL_DNS_FILE

server:

	local-zone: "$INT_DNS_DOMAIN" static

	local-data: "$INT_DNS_HOST.$INT_DNS_DOMAIN A $INT_DNS_IP"

	local-data-ptr: "$INT_DNS_IP $INT_DNS_HOST.$INT_DNS_DOMAIN"

EOF

		cat << EOF > $LOCAL_DNS_BLACKHOLE_FILE

server:

	server:

	interface: ${INT_DNS_IP}@56

	access-control-view: $INT_DNS_IP_MASK $INTIF

view:

	name: "$INTIF"

	local-zone: "." redirect

	local-data: ". A $INT_DNS_IP"

	local-zone: "$INT_DNS_DOMAIN" static

	local-data: "$INT_DNS_HOST.$INT_DNS_DOMAIN A $INT_DNS_IP"

	local-data-ptr: "$INT_DNS_IP $INT_DNS_HOST.$INT_DNS_DOMAIN"

EOF

	while read -r line

	do

		ip_address=$(echo $line | awk '{ print $1 }')

		domain=$(echo $line | awk '{ print $2 }')

		if ! echo $line | grep -E -q "^([0-9\.\t ]+alcasar( |$)|127\.0\.0)"

		then

			echo -e "\tlocal-data: \"$domain.$INT_DNS_DOMAIN A $ip_address\"" >> $LOCAL_DNS_FILE

			echo -e "\tlocal-data-ptr: \"$ip_address $domain.$INT_DNS_DOMAIN\"" >> $LOCAL_DNS_FILE

			echo -e "\tlocal-data: \"$domain.$INT_DNS_DOMAIN A $ip_address\"" >> $LOCAL_DNS_BLACKHOLE_FILE

			echo -e "\tlocal-data-ptr: \"$ip_address $domain.$INT_DNS_DOMAIN\"" >> $LOCAL_DNS_BLACKHOLE_FILE

		fi

	done < $LOCAL_HOSTNAME_FILE

}

case $args in

	-\? | -h | --h)

		echo "$usage"

		exit 0

		;;

	--add|-add) # add a local host resolution

		if [ $nb_args -ne 3 ]

		then

			echo "$usage"

			exit 1

		else

			# removing if already exists

			$SED "/^$2[ \t]*$3/d" $LOCAL_HOSTNAME_FILE

			# adding to the hosts file

			echo -e "$2\t$3" >> $LOCAL_HOSTNAME_FILE

			hosts_to_unbound

			restart_dns

		fi

		;;

	--del|-del) # remove a local host resolution

		if [ $nb_args -ne 3 ]

		then

			echo "$usage"

			exit 1

		else

			$SED "/^$2[ \t]*$3/d" $LOCAL_HOSTNAME_FILE

			hosts_to_unbound

			restart_dns

		fi

		;;

	--reload|-reload)

			hosts_to_unbound

			restart_dns

		;;

	--hosts_to_unbound|-hosts_to_unbound)

			hosts_to_unbound

		;;

	--off|-off) # disable DNS redirector

		#$SED "s?^#filterwin2k.*?filterwin2k?g" $DNSMASQ_CONF_FILE

		rm -f $LOCAL_DOMAIN_CONF_FILE

		$SED "s?^INT_DNS_ACTIVE.*?INT_DNS_ACTIVE=off?g" $ALCASAR_CONF_FILE

		restart_dns

		# Reload firewall

		/usr/local/bin/alcasar-iptables.sh

		;;

	--on|-on) # enable DNS redirector

		#$SED "s?^filterwin2k.*?#filterwin2k?g" $DNSMASQ_CONF_FILE

		cat > $LOCAL_DOMAIN_CONF_FILE << EOF

server:

    local-zone: "$INT_DNS_DOMAIN." transparent

forward-zone:

	name: "$INT_DNS_DOMAIN."

	forward-addr: $INT_DNS_IP

EOF

		$SED "s?^INT_DNS_ACTIVE.*?INT_DNS_ACTIVE=on?g" $ALCASAR_CONF_FILE

		restart_dns

		# Reload firewall

		/usr/local/bin/alcasar-iptables.sh

		;;

	*)

		echo "Argument inconnu : $1";

		echo "$usage"

		exit 1

		;;

esac