Making bind zone files based on dhcpd config file
=================================================

Public domain
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### Run this script from crontab every minute.

    #!/bin/bash
    
    # Configuration
    DHCPDCONF="/etc/dhcpd.conf"
    DOMAIN="example.net"
    REVIP="0.168.192"
    FORWARD="/var/named/${DOMAIN}/${DOMAIN}.fwd"
    REVERSE="/var/named/${DOMAIN}/${DOMAIN}.rev"
    
    # Forward zone header records
    FW_HEADER="\$TTL 1D
    \$ORIGIN ${DOMAIN}.
    @ SOA ns hostmaster 2011073000 1H 10M 1W 3H
       NS  ns
    ns A 192.168.0.10
    "
    
    # Reverse zone header records
    RV_HEADER="\$TTL 1D
    \$ORIGIN ${REVIP}.in-addr.arpa.
    @ SOA ns.${DOMAIN}. hostmaster.${DOMAIN}. 2011073000 1H 10M 1W 3H
       NS ns.${DOMAIN}.
    10 PTR ns.${DOMAIN}.
    "
    
    # Making new dns zone files
    
    echo "${FW_HEADER}" > ${FORWARD}
    echo "${RV_HEADER}" > ${REVERSE}
    
    cat "${DHCPDCONF}" | while read line; do
      if $(echo "$line" | grep -q 'host') && $(echo "$line" | grep -q '{'); then
          HOST=$(echo $line | sed -e 's,.*host *,,' -e 's, *{.*,,')
      fi
      if $(echo "$line" | grep -q 'hardware ethernet'); then
       MAC=$(echo $line | sed -e 's,.*hardware ethernet *,,' -e 's,;.*,,')
      fi
      if $(echo "$line" | grep -q 'fixed-address'); then
       IP=$(echo $line | sed -e 's,.*fixed-address *,,' -e 's,;.*,,')
      fi
      if [ "$HOST" != "" ] && [ "$MAC" != "" ] && [ "$IP" != "" ]; then
        # $HOST $MAC $IP
        LAST=$(echo $IP | sed -e 's,.*\.,,g')
        echo "$HOST A $IP" >> ${FORWARD}
        echo "$LAST PTR $HOST.${DOMAIN}." >> ${REVERSE}
        HOST=""
        MAC=""
        IP=""
      fi
    done
    
    # Reload new zones
    /usr/sbin/rndc reload
    
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### dhcpd.conf example

    ddns-update-style none;
    subnet 192.168.0.0 netmask 255.255.255.0 {
      option routers                192.168.0.1;
      option subnet-mask            255.255.255.0;
      option domain-name-servers    8.8.8.8, 8.8.4.4;
      default-lease-time 60;
      max-lease-time 600;
    
      host sysop {
        hardware ethernet 6c:f0:49:45:e9:ba; 
        fixed-address 192.168.0.11;
      }
    
      host station01 {
        hardware ethernet 00:11:2f:4b:63:1b;
        fixed-address 192.168.0.12;
      }
    
      host station02 {
        hardware ethernet 00:14:85:ee:92:3a;
        fixed-address 192.168.0.13;
      }
    
      host station03 {
        hardware ethernet 1c:af:f7:10:56:8b; 
        fixed-address 192.168.0.14;
      }
    }
    
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_BY: Pejman Moghadam_  
_TAG: bind, dhcpd, bash-script, bash_  
_DATE: 2011-07-30 01:12:59_