#!/bin/sh
# 2001-09-06 Rafael Skodlar
# Create DHCP entries in /etc/dhcpd.conf

DATE=`date '+%Y-%m-%d'`
DHCP_CONF=/etc/dhcpd.conf
DOMAIN="mydomain.com"
NISDOMAIN="mydomain.com"
NTPSRV="ntp.mydomain.com"
NISSRV="archer.mydomain.com"
LPRSRV="web.mydomain.com"
BROADCAST="192.168.10.255"
DNSSRV="192.168.0.2,192.168.0.31"
WINS=192.168.0.19
ROUTERS="192.168.0.1"
SUBNET1="192.168.0.0"
NETMASK="255.255.255.0"
RANGE1="192.168.0.248 192.168.0.249"
ARPTABLE=$HOME/config/hosts.dhcpd
DEFAULT_LEASE=86400
MAX_LEASE=604800

cp $DHCP_CONF $DHCP_CONF.$DATE

function backup()
{
  cd /var/named
  tar cfp * backup/named_${DATE}.tar
}

function usage()
{
        clear
        cat << EOM

----------------------------------------------------------------------
        1. Edit DNS tables
        2. Edit $ARPTABLE
        3. Restart DNS
        4. Create $DHCP_CONF
        5. Restart DHCP Server
        6. Usage
        7. Exit
----------------------------------------------------------------------

EOM
}

function makedhcp()
{
  cat << EOM > $DHCP_CONF
# DHCP Configuration File
# $DATE Created by script $0

option nis-servers $NISSRV;
option nis-domain "$NISDOMAIN";
option domain-name-servers $DNSSRV;

subnet $SUBNET1 netmask $NETMASK {
        option time-servers $NTPSRV;
        option domain-name-servers $DNSSRV;
        option routers $ROUTERS;
        option ntp-servers $NTPSRV;
        option lpr-servers $LPRSRV;
        option domain-name "$DOMAIN";
        option netbios-name-servers $WINS;
        next-server images;
        filename "/export/tftp/vmlinuz";
#       range $RANGE1;
        default-lease-time $DEFAULT_LEASE;
        max-lease-time $MAX_LEASE;

EOM

  i=0

  while read arpinfo
  do
    let i=i+1
    MAC=`echo $arpinfo | awk '{print $1}'`
    IP=`echo $arpinfo | awk '{print $2}'`
    HOST=`dig -x $IP | awk '/1D IN PTR/{print $5}' | sed 's/\.$//g'`
#    echo "$i ===> $IP  $HOST"
    cat << EOM >> $DHCP_CONF
host $HOST {
    hardware ethernet $MAC;
    fixed-address $IP;
}

EOM
  done < $ARPTABLE

  echo "}" >> $DHCP_CONF
  echo "#EOF" >> $DHCP_CONF

cat << EOM
=========================================
        Processed $i hosts

=========================================

EOM

}

menu ()
{
PS3='Select? '

select action in DNS-Edit DHCP-Edit DNS-Restart DHCP-Create DHCP-Restart Usage E
xit;
do
        usage
        [ "$action" = "DNS-Edit" ] && /root/bin/vidns
        [ "$action" = "DNS-Restart" ] && (/etc/rc3.d/S55named restart)
        [ "$action" = "DHCP-Edit" ] && vi $ARPTABLE
        [ "$action" = "DHCP-Create" ] && makedhcp
        [ "$action" = "DHCP-Restart" ] && (/etc/rc3.d/S65dhcpd restart)
        [ "$action" = "Usage" ] && usage
        if [ "$action" = "Exit" ];then
                clear
                exit
        fi
done
}

backup
usage
menu

#EOS