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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