#!/bin/bash

user=`whoami`
if [ $user != "root" ]; then
	echo "You must be root to execute this"
	exit
fi

if [ -z "$1" ]; then
	echo "You must specify a zone file to update"
	exit
fi

_in_file="$1"
echo "Finding serial in: $_in_file"
_get_serial=`cat $_in_file | grep -i "serial" | cut -d ";" -f1`

function parseserial
{
	_get_serial=$1
}
function incrementserial
{
	_get_inc=`getincval $_get_serial`
	_date=`date +%Y%m%e$_get_inc`
	_get_serial=$(( $_date + 1 ))
}

parseserial $_get_serial
_old_serial=$_get_serial
echo "Serial Found: $_get_serial"
echo "Incrementing serial by one"
incrementserial $_get_serial
echo "Serial incremented to: $_get_serial"

#
#- echo day | sed s/day/night/ 
#	replaces day with night
#- we need to: replace old with new
#	sed s/<old_serial>/<new_serial/
#

echo "Making backup ( $_in_file -> $_in_file-$_old_serial )"
cp $_in_file $_in_file-$_old_serial

echo "Replacing old serial ( $_old_serial ) with new serial ( $_get_serial ) and creating tmp file"
sed s/$_old_serial/$_get_serial/ <$_in_file> $_in_file.tmp

echo "Moving tmp file into primary location"
mv $_in_file.tmp $_in_file

#$2 = domain
#$3 = type
#$4 = type 
#$5 = IP
#_parse_line="$2       $3        $4        $5"
#echo _parse_line >> $_in_file