librenms-librenms/html/includes/graphs/macaccounting/auth.inc.php

<?php

if (is_numeric($id))
{

  $acc = dbFetchRow("SELECT * FROM `mac_accounting` AS M, `ports` AS I, `devices` AS D WHERE M.ma_id = ? AND I.interface_id = M.interface_id AND I.device_id = D.device_id", array($id));

  if (($config['allow_unauth_graphs'] || port_permitted($acc['interface_id']))
  {
    if(is_file($config['rrd_dir'] . "/" . $acc['hostname'] . "/" . safename("cip-" . $acc['ifIndex'] . "-" . $acc['mac'] . ".rrd")))
      {
      $rrd_filename = $config['rrd_dir'] . "/" . $acc['hostname'] . "/" . safename("cip-" . $acc['ifIndex'] . "-" . $acc['mac'] . ".rrd");  

      $port   = get_port_by_id($acc['interface_id']);  
      $device = device_by_id_cache($port['device_id']);
      $title  = generate_device_link($device);
      $title .= " :: Port  ".generate_port_link($port);
      $title .= " :: " . formatMac($acc['mac']);
      $auth   = TRUE;
    }
  } else {
    $graph_error = "file not found";
  }
}
?>