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<?php
require('func.php');
$data = shell_exec("grep -e 'lease [[:digit:]\.]\+ {' -e '\s\+ends' /var/lib/dhcp/dhcpd.leases");
preg_match_all('/lease ([\d\.]+) \{\n\s+ends \d+ (\d{4}\/\d{2}\/\d{2} \d+:\d{2}:\d{2});/s', $data, $match);
unset($data, $match[0]);
$dend = time()-120;
$clients = 0;
foreach($match[2] as $timeout) {
$end = strtotime($timeout.' UTC');
if($end > $dend) $clients++;
}
$data = 'clients,host={{ ansible_hostname }},type=backend value='.$clients;
sendflux($data);
?>
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