#!/bin/sh
#############################################
#Autor:Douglas Q. dos Santos
#Data:03/03/2010
#Email:douglashx@gmail.com
#Preparação de servidor DNS Slave
#############################################
#-- COMANDOS ------------------------------------
APTITUDE=$(which aptitude)
CAT=$(which cat)
CHMOD=$(which chmod)
CHOWN=$(which chown)
DATA=$(which date)
LN=$(which ln)
MKDIR=$(which mkdir)
MKNOD=$(which mknod)
MV=$(which mv)
SLEEP=$(which sleep)
CUT=$(which cut)
#------------------------------------------------

#-- CAMINHOS ------------------------------------
PATH_BIND="/var/lib/named"
#------------------------------------------------

#-- VARIÁVEIS -----------------------------------
echo -n "Forneça o nome do domínio a ser configurado (dominio.com.br): "
read DOMAIN
echo -n "Forneça a faixa de IP da rede valida (ip/mask): "
read NETWOTK_RANGE
echo -n "Forneça o endereço IP do servidor Master (ip): "
read NS1_IP

echo
#------------------------------------------------

#-- INSTALAÇÃO DO PACOTE ------------------------
echo "A instalação será iniciada em 5 segundos"
${SLEEP} 5

${APTITUDE} update
${APTITUDE} install bind9 dnsutils -y

/etc/init.d/bind9 stop
#------------------------------------------------

#-- ARVORE DE DIRETÓRIOS ------------------------
${MKDIR} -p ${PATH_BIND}/etc
${MKDIR} -p ${PATH_BIND}/dev
${MKDIR} -p ${PATH_BIND}/var/cache/bind/slave
${MKDIR} -p ${PATH_BIND}/var/run/bind/run
${MKNOD} ${PATH_BIND}/dev/null c 1 3
${MKNOD} ${PATH_BIND}/dev/random c 1 8

#Ajustando permissões
${CHMOD} 666 ${PATH_BIND}/dev/null ${PATH_BIND}/dev/random
${CHOWN} -R bind:bind ${PATH_BIND}/var/*

${MV} /etc/bind ${PATH_BIND}/etc
${LN} -s ${PATH_BIND}/etc/bind /etc/bind
${CHOWN} -R bind:bind ${PATH_BIND}/etc/bind


#-- AJUSTANDO O ARQUIVO /etc/default/bind9 ------
${CAT} <<EOF > /etc/default/bind9
#/etc/default/bind9
RESOLVCONF=yes

# startup options for the server
#OPTIONS="-u bind"
OPTIONS="-u bind -t ${PATH_BIND}"
EOF
#------------------------------------------------


#-- AJUSTANDO O ARQUIVO /etc/resolv.conf --------
${CAT} <<EOF > /etc/resolv.conf
domain ${DOMAIN}
nameserver 127.0.0.1
EOF
#------------------------------------------------

#Extraindo o reverso do servidor Master
REV3=`echo ${NS1_IP} | cut -d '.' -f 3`
REV2=`echo ${NS1_IP} | cut -d '.' -f 2`
REV1=`echo ${NS1_IP} | cut -d '.' -f 1`
IP_REVERSE=${REV3}.${REV2}.${REV1}


#-- AJUSTANDO O ARQUIVO /srv/bind/etc/bind/named.conf.options ----
${MV} ${PATH_BIND}/etc/bind/named.conf.options ${PATH_BIND}/etc/bind/named.conf.options.orig
${CAT} <<EOF > ${PATH_BIND}/etc/bind/named.conf.options
options {
   directory "/var/cache/bind";

   // If there is a firewall between you and nameservers you want
   // to talk to, you might need to uncomment the query-source
   // directive below.  Previous versions of BIND always asked
   // questions using port 53, but BIND 8.1 and later use an unprivileged
   // port by default.

   // query-source address * port 53;

   // If your ISP provided one or more IP addresses for stable
   // nameservers, you probably want to use them as forwarders.
   // Uncomment the following block, and insert the addresses replacing
   // the all-0's placeholder.

   // forwarders {
   //      0.0.0.0;
   // };

   auth-nxdomain no;    # conform to RFC1035
   listen-on-v6 { any; };

   listen-on { 127.0.0.1/32; ${NETWOTK_RANGE}; };
   allow-query { any; };
   allow-recursion { 127.0.0.1/32; };
   allow-transfer { none; };
   version "Não Disponível";
};
EOF
#------------------------------------------------

#-- AJUSTANDO O ARQUIVO /srv/bind/etc/bind/named.conf.local -------------------
${MV} ${PATH_BIND}/etc/bind/named.conf ${PATH_BIND}/etc/bind/named.conf.orig
${CAT} <<EOF > ${PATH_BIND}/etc/bind/named.conf
// This is the primary configuration file for the BIND DNS server named.
//
// Please read /usr/share/doc/bind9/README.Debian.gz for information on the
// structure of BIND configuration files in Debian, *BEFORE* you customize
// this configuration file.
//
// If you are just adding zones, please do that in /etc/bind/named.conf.local

include "/etc/bind/named.conf.options";

// prime the server with knowledge of the root servers
zone "." {
   type hint;
   file "/etc/bind/db.root";
};

// be authoritative for the localhost forward and reverse zones, and for
// broadcast zones as per RFC 1912

zone "localhost" {
   type master;
   file "/etc/bind/db.local";
};

zone "127.in-addr.arpa" {
   type master;
   file "/etc/bind/db.127";
};

zone "0.in-addr.arpa" {
   type master;
   file "/etc/bind/db.0";
};

zone "255.in-addr.arpa" {
   type master;
   file "/etc/bind/db.255";
};

zone "${DOMAIN}" {
   type slave;
   file "slave/db.${DOMAIN}";
   masters { ${NS1_IP}; };
   allow-transfer { none; };
   allow-update { none; };
};

zone "${IP_REVERSE}.in-addr.arpa" {
   type slave;
   file "slave/db.${IP_REVERSE}";
   masters { ${NS1_IP}; };
   allow-transfer { none; };
   allow-update { none; };
};


include "/etc/bind/named.conf.local";
EOF
#------------------------------------------------

#-- REINICIANDO OS SERVIÇOS ----------------------
/etc/init.d/bind9 stop
/etc/init.d/bind9 start
#------------------------------------------------

#-- MENSAGEM DE FINALIZAÇÃO ---------------------
echo
echo "INSTALAÇÃO FINALIZADA"
echo "Faca os ajustes necessários e reinicie o serviço *bind9*"
echo
#------------------------------------------------
exit 0