#!/usr/bin/env perl

use strict;
use warnings;
use POSIX;

my $dhcpd_cmd="/usr/local/bin/dhcpd-pools";
my $dhcpd_lf="/var/lib/dhcp/dhcpd.leases";
my $dhcpd_cf="/etc/dhcp/dhcpd.conf";

my @output = `$dhcpd_cmd -c $dhcpd_cf -l $dhcpd_lf`;

my $line;
my $subnet;
my $subnet2;

for $line (@output) {

  next if ($line =~ /^(shared net name|Ranges|name|Shared networks|Sum of all)/) or (length $line <=  1);

    if ($line =~ /([\d]+\.[\d]+\.[\d]+\.[\d]+)\s+\-\s+([\d]+\.[\d]+\.[\d]+\.[\d]+)\s+([\d]+)\s+([\d]+)\s+([\d]+\.[\d]+)/) {

      my $first_ip=$1;
      my $last_ip=$2;
      my $max=$3;
      my $current=$4;
      my $percent=ceil($5);
      
      my $octet;
      my @octets;
	
	my $octet_count=0;
        for $octet (@octets=(split('\.',$first_ip))) {
	  if ($octet_count == 3) {
	     $octet_count=0;
	     $subnet = $first_ip;
	     substr($subnet,-length($octet)) = ($octet-4);     
	     $subnet =~ s/\./_/g;
		
	       if (defined $ARGV[0] && $ARGV[0] eq "config") {
        	  print_config($subnet);
	       } else {
		print "dhcp_pool_${subnet}.value $percent\n";
	     }
        
	 }

	$octet_count++;  
       
	}

   }

}

sub print_config {

my $graph_name;

$graph_name = shift;

print <<EOF;
graph_args --upper-limit 100 -l 0
graph_title DHCP IPv4 Pools Status
graph_vlabel %
graph_category DHCP
dhcp_pool_${graph_name}.label $graph_name
EOF

}

# print_config;

#shared net name     first ip           last ip            max   cur    percent  touch   t+c  t+c perc
# All networks        88.92.0.4        - 88.92.0.62          59    26     44.068      2    28    47.458

#}