Configurando um servidor DNS e DHCP na rede

#!/bin/bash
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#Sistema de Configuração de Servidores Bind9                                                            
#Desenvolvido por Douglas Q. dos Santos                                                      
#<douglashx@gmail.com>
# Criado em 19/10/2009 - Ultima alteração em 19/10/2009  
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #

######################COMANDOS UTILIZADOS NO SCRIPT#############
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)
############################################################

###################CAMINHO DA JAULA DO BIND######################
PATH_BIND="/var/lib/named"
############################################################

###################VARIÁVEIS PARA A CONFIGURAÇÃO DAS ZONAS#########
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 EX:10.10.10.0/24): "
read NETWORK_RANGE
echo -n "Forneça o endereço IP do servidor NS1 (ip): "
read NS1_IP
echo -n "Forneça o endereço IP do servidor NS2 (ip): "
read NS2_IP
echo -n "Forneça o endereço IP do servidor MX (ip): "
read MX_IP
echo -n "Forneça o endereço IP do servidor WWW (ip): "
read WWW_IP

echo
############################################################

######################INSTALAÇÃO DOS PACOTES####################
echo "A instalação sera iniciada em 5 segundos"
${SLEEP} 5

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

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

######################CRIAÇÃO DA ARVORE DE DIRETÓRIOS##############
${MKDIR} -p ${PATH_BIND}/etc
${MKDIR} -p ${PATH_BIND}/dev
${MKDIR} -p ${PATH_BIND}/var/cache/bind
${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 ENDEREÇO REVERSO DO NS1###########
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 /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; ${NETWORK_RANGE}; };
   allow-query { any; };
   allow-recursion { 127.0.0.1/32; };
   allow-transfer { none; };
   version "Nao disponível";
};
EOF
###############################################################

#######################AJUSTANDO O ARQUIVO /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 "${DOMAIN}" {
   type master;
   file "db.${DOMAIN}";
   allow-transfer { ${NS2_IP}; };
};

zone "${IP_REVERSE}.in-addr.arpa" {
   type master;
   file "db.${IP_REVERSE}";
   allow-transfer { ${NS2_IP}; };
};

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

###############AJUSTANDO O ARQUIVO /var/lib/named/var/cache/bind/db.dominio.com.br##
${CAT} <<EOF > ${PATH_BIND}/var/cache/bind/db.${DOMAIN}
`echo '$TTL 86400'`
@ IN SOA  dns.${DOMAIN}. root.dns.${DOMAIN}. (
                        `date +%Y%m%d`01  ; Serial
                        3600       ; Refresh
                        1800        ; Retry
                        604800      ; Expire
                        3600 )     ; Minimum

;
@      IN    NS   ${DOMAIN}.
@               IN   NS   ns1.${DOMAIN}.
@               IN    NS   ns2.${DOMAIN}.
@               IN    MX   0 mail.${DOMAIN}.

;NAME SERVERS
@               IN    A    ${NS1_IP}
ns1             IN    A    ${NS1_IP}
ns2             IN    A    ${NS2_IP}
dns             IN    A    ${NS1_IP}

;MAIL SERVERS
mail            IN    A    ${MX_IP}
imap            IN    CNAME mail
pop             IN    CNAME mail
smtp            IN    CNAME mail
webmail         IN    CNAME mail

;WEB SERVERS
adm             IN    A    ${WWW_IP}
www             IN    A    ${WWW_IP}
ftp             IN    CNAME www
dbadmin         IN    CNAME www
mailadmin       IN    CNAME www
EOF
#####################################################################

#####################RETIRANDO OS ENDEREÇOS FINAIS PARA O ARQUIVO REVERSO######
REV_NS1=$(echo ${NS1_IP} | cut -d '.' -f 4)
REV_NS2=$(echo ${NS2_IP} | cut -d '.' -f 4)
REV_MX=$(echo ${MX_IP} | cut -d '.' -f 4)
REV_WWW=$(echo ${WWW_IP} | cut -d '.' -f 4)
#####################################################################


##########AJUSTANDO O ARQUIVO /var/lib/named/var/cache/bind/db.10.10.10###############
${CAT} <<EOF > ${PATH_BIND}/var/cache/bind/db.${IP_REVERSE}
`echo '$TTL 86400'`
@ IN SOA  dns.${DOMAIN}. root.dns.${DOMAIN}. (
                        `date +%Y%m%d`01  ; Serial
                        3600       ; Refresh
                        1800        ; Retry
                        604800      ; Expire
                        3600 )     ; Minimum

;
@      IN    NS   ${DOMAIN}.
@               IN   NS   ns1.${DOMAIN}.
@               IN    NS   ns2.${DOMAIN}.
@               IN    MX   0 mail.${DOMAIN}.

;NAME SERVERS
${REV_NS1}      IN    PTR    ${DOMAIN}.
${REV_NS1}      IN    PTR    ns1.${DOMAIN}.
${REV_NS2}      IN    PTR    ns2.${DOMAIN}.
${REV_NS1}      IN    PTR    dns.${DOMAIN}.

;MAIL SERVERS
${REV_MX}       IN    PTR    mail.${DOMAIN}.

;WEB SERVERS
${REV_WWW}      IN    PTR    adm.${DOMAIN}.
${REV_WWW}      IN    PTR    www.${DOMAIN}.
EOF
####################################################################


#########################INICIANDO OS SERVIÇOS##########################
/etc/init.d/bind9 start
#/etc/init.d/bind9 start
####################################################################

###########################MENSAGEM DE FINALIZAÇÃO######################
echo
echo "INSTALAÇÃO FINALIZADA"
echo "Faca os ajustes necessários e reinicie o serviço *bind9*"
echo "Os Logs serão gerados no arquivo /var/log/syslog        "
echo
####################################################################
exit 0