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#!/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