#!/bin/bash
######系統配合
#下載ISO檔
#https://ftp.ubuntu-tw.org/ubuntu-releases/26.04.1/ 安裝
######鄭亮星 jls@mail.jls.idv.tw , jls550225@gmail.com , jls@acfs.tw
##設定DNS
ETH0=$(ls /proc/net/dev_snmp6 |awk '{ print $1 }' |sed -n '1p')
IP=$(ifconfig $ETH0 |grep 'inet ' |awk '{print $2}')
HOST=$(/bin/hostname -s)
HOSTNAME=$(/bin/hostname)
DOMAINNAME=$(/bin/hostname -d)
sync

#########DNS正解
DATE=$(date "+%Y%m%d%H")
cp -arf /etc/bind/named.conf.root-hints /etc/bind/named.conf.root-hints-$DATE
cat >> /etc/bind/named.conf.root-hints << EOF
zone "$DOMAINNAME"{
        type master;
        file "/etc/bind/$DOMAINNAME";
        allow-update { none; };
};

EOF

cat > /etc/bind/$DOMAINNAME << EOF
\$TTL 1D
@               IN      SOA     $HOSTNAME. hostmaster.$HOSTNAME. (
                        $DATE ; serial
                        1H ; refresh
                        15M ; retry
                        14D ; expire
                        12H ; default_ttl
                        )
@               IN      NS              $HOSTNAME.
@               IN      MX      5       $DOMAINNAME.
@               IN      MX      10      mail.$DOMAINNAME.
@               IN      MX      15      $HOSTNAME.
@		IN	A	$IP
@		IN	TXT	"v=spf1 a mx ip4:$IP include:_spf.google.com -all"
$DOMAINNAME.	IN	A	$IP
$HOST		IN	A	$IP
www		IN	A	$IP
mail		IN	A	$IP
mail		IN	TXT	"v=spf1 a mx ip4:$IP include:_spf.google.com -all"
ftp		IN	A	$IP
webmail		IN	A	$IP
postfix		IN	A	$IP
bandwidthd	IN	A	$IP
mrtg		IN	A	$IP
EOF

#####DNS 反解
EXT_IF="$ETH0"
netinfo ()
{
IP=""
MASK=""
NET=""
for NIC in "$@" ; do
        {
        IP=$(ifconfig $NIC |grep 'inet ' |awk '{print $2}')
        MASK=$(ifconfig $NIC |grep 'inet ' |awk '{print $4}')
        BCAST=$(ifconfig $NIC |grep 'inet ' |awk '{print $6}')
        IP1=$(echo $IP |awk -F'.' '{print $1}')
        if [ "$IP1" = "" ]; then
                echo ""
                echo "Warning: there is no IP found on $NIC."
                echo "Action is aborted."
                echo "Please make sure the interface is setup properly, then try again."
                echo ""
                exit 1
        else
        IP2=$(echo $IP |awk -F'.' '{print $2}')
        IP3=$(echo $IP |awk -F'.' '{print $3}')
        IP4=$(echo $IP |awk -F'.' '{print $4}')
        MASK1=$(echo $MASK |awk -F'.' '{print $1}')
        MASK2=$(echo $MASK |awk -F'.' '{print $2}')
        MASK3=$(echo $MASK |awk -F'.' '{print $3}')
        MASK4=$(echo $MASK |awk -F'.' '{print $4}')
        BCAST1=$(echo $BCAST |awk -F'.' '{print $1}')
        BCAST2=$(echo $BCAST |awk -F'.' '{print $2}')
        BCAST3=$(echo $BCAST |awk -F'.' '{print $3}')
        BCAST4=$(echo $BCAST |awk -F'.' '{print $4}')
        let NET1="$IP1 & $MASK1"
        let NET2="$IP2 & $MASK2"
        let NET3="$IP3 & $MASK3"
        let NET4="$IP4 & $MASK4"
        NET="$NET1.$NET2.$NET3.$NET4"
        fi
        }
done
}
DoMainName="$DOMAINNAME"
netinfo "$EXT_IF"
revZone="$IP1.$IP2.$IP3.$NET4-$BCAST4"
##### /etc/bind/named.conf.root-hints

echo 'zone "'$NET4-$BCAST4.$IP3.$IP2.$IP1'.in-addr.arpa"{' >> /etc/bind/named.conf.root-hints
echo "     type master;"  >> /etc/bind/named.conf.root-hints
echo '     file "'/etc/bind/$revZone'";'  >> /etc/bind/named.conf.root-hints
echo "     allow-update { none; };"  >> /etc/bind/named.conf.root-hints
echo "};"  >> /etc/bind/named.conf.root-hints
####/var/named

echo '$TTL 1D' > /etc/bind/$revZone
echo "@               IN      SOA     $HOSTNAME.    hostmaster.$HOSTNAME. (" >> /etc/bind/$revZone
echo "                        $DATE; serial" >> /etc/bind/$revZone
echo "                        1H ; refresh" >> /etc/bind/$revZone
echo "                        15M ; retry" >> /etc/bind/$revZone
echo "                        14D ; expire" >> /etc/bind/$revZone
echo "                        12H ; default_ttl" >> /etc/bind/$revZone
echo "                        )" >> /etc/bind/$revZone
echo "@			IN	NS	$HOSTNAME." >> /etc/bind/$revZone
echo "$IP4		IN	PTR	mail.$DOMAINNAME." >> /etc/bind/$revZone
echo "$IP4		IN	PTR	www.$DOMAINNAME." >> /etc/bind/$revZone
systemctl enable named.service
sync;sync;reboot