#!/bin/bash
set -u
set -e
# cree les fichiers de configuration bind9 
#  - ficher de zone directe
#  - ficher de zone inverse
#

zone="domaine.lan"


initialize () {
readonly zonenet="192.168.56"
readonly zonerev="56.168.192.in-addr.arpa"

# NS1
readonly nsname="srv1"
readonly nsip="${zonenet}.10"
readonly nsiprev=$(echo ${nsip}|cut -d. -f4) # dernier octet pour classe C

# NS2 
readonly nsname2="srv2"
readonly nsip2="${zonenet}.11"
readonly nsiprev2=$(echo ${nsip2}|cut -d. -f4)
readonly ttl="86400"

# Global
readonly nsfqdn="${nsname}.${zone}"
readonly nsfqdnp="${nsfqdn}."
readonly zonep="${zone}."
readonly date=$(date +%Y%m%d00)
}

if [[ $# != 1 ]] ; then
   echo "usage : $0 <dns-zone>"
   exit 1
fi 
zone=$1
initialize


echo "Generation fichier named.conf.local ..."
cat <<EOT > "named.conf.local"

# fichier zone ${zone}
# le $(date)

zone "${zone}" {
    type master;
    file "/etc/bind/db.${zone}"; # zone directe
};

zone "${zonerev}" {
    type master;
    file "/etc/bind/db.${zone}.rev";  # zone inverse 
};

EOT

# fichier de zone directe 
echo "Generation fichier de zone directe db.${zone} ..."
cat <<EOT > "db.${zone}"
; fichier zone ${zone}
; le $(date)
\$TTL ${ttl} ; (1 day)
\$ORIGIN ${zonep}
@ IN SOA ${nsfqdnp} root.${nsfqdnp} (
                ${date} ; serial YYYYMMDDnn
                14400      ; refresh (4 hours)
                1800       ; retry   (30 minutes)
                1209600    ; expire  (2 weeks)
                3600       ; minimum (1 hour)
                )
 
@                  IN   NS    ${nsname}
@                  IN   NS    ${nsname2}
 
                   IN   A     203.0.113.10 ;  zone 
                   IN   AAAA  2001:DB8:BEEF:113::10  ;
www                IN   CNAME ${nsfqdnp}
ftp                IN   CNAME ${nsfqdnp}
 
${nsname}	   IN   A     ${nsip}
                   IN   AAAA  2001:DB8:BEEF:2::22
${nsname2}         IN   A     ${nsip2}
                   IN   AAAA  2001:DB8:BEEF:100::22

EOT

echo "Generation fichier de zone inverse db.${zone}.rev ..."
cat <<EOT > "db.${zone}.rev"
; fichier zone inverse ${zone}
; le $(date)
\$TTL ${ttl} ; (1 day)
@ IN SOA ${nsfqdnp} root.${nsfqdnp} (
                ${date} ; serial YYYYMMDDnn
                14400      ; refresh (4 hours)
                1800       ; retry   (30 minutes)
                1209600    ; expire  (2 weeks)
                3600       ; minimum (1 hour)
                )
 
@                 IN   NS    ${nsname}.${zone}.
@                 IN   NS    ${nsname2}.${zone}.
 
 
${nsiprev}	 IN   PTR     ${nsname}.${zone}.
${nsiprev2}      IN   PTR     ${nsname2}.${zone}.

EOT

echo "Generation fichier /etc/resolv.conf ..."
cat <<EOT > "/etc/reolv.conf"

# fichier resolv.conf ${zone}
# le $(date)
domain "${zone}"
search "${zone}"
nameserver 127.0.0.1
EOT