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<?php
date_default_timezone_set('UTC');
require('func.php');
$dhcp_config = file_get_contents('/etc/dhcpd.conf');
$num_ranges = preg_match_all('/range[\s]+([\d]+\.[\d]+\.[\d]+\.[\d]+)[\s]+([\d]+\.[\d]+\.[\d]+\.[\d]+)/', $dhcp_config, $ranges);
$lease_file_handle = fopen("/var/lib/dhcp/dhcpd.leases", "r");
$activeleases = array();
$lease = -1;
$start = -1;
$end = -1;
while(($line = fgets($lease_file_handle)) !== false)
{
if(preg_match('/lease ([\d]+\.[\d]+\.[\d]+\.[\d]+)/', $line, $match))
{
$lease = ip2long($match[1]);
continue;
}
elseif(preg_match('/starts \d ([\d]{4})\/([\d]{2})\/([\d]{2}) ([\d]{2}):([\d]{2}):([\d]{2})/', $line, $match))
{
$start = mktime($match[4], $match[5], $match[6], $match[2], $match[3], $match[1]);
continue;
}
elseif(preg_match('/ends \d ([\d]{4})\/([\d]{2})\/([\d]{2}) ([\d]{2}):([\d]{2}):([\d]{2})/', $line, $match))
{
$end = mktime($match[4], $match[5], $match[6], $match[2], $match[3], $match[1]);
if($lease > 0 && $start > 0 && $end > 0)
{
if( $start < time() && $end > time() )
{
$activeleases[$lease] = $lease;
$lease = -1;
$start = -1;
$end = -1;
}
}
}
}
$pools = array();
for($range = 0; $range < $num_ranges; $range++)
{
$clients = 0;
$range_start = ip2long($ranges[1][$range]);
$range_end = ip2long($ranges[2][$range]);
foreach($activeleases as $lease)
{
if( $lease > $range_start && $lease < $range_end )
{
$clients++;
}
}
$pools[$range_start] = $clients;
}
$data = "";
foreach($pools as $range => $clients)
{
$data .= 'clients,host={{ ansible_hostname }},pool='.long2ip($range).',type=backend value='.$clients."\n";
}
sendflux($data);
?>
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