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

<?php

if (is_numeric($vars['id']) && ($auth || port_permitted($vars['id']))) {
    $port   = get_port_by_id($vars['id']);
    $device = device_by_id_cache($port['device_id']);
    $title  = generate_device_link($device);
    $title .= ' :: Port  '.generate_port_link($port);
    if ($port['ifAlias'] != '') {
        $title .= ', '.$port['ifAlias'];
    }

    $graph_title = shorthost($device['hostname']).'::'.strtolower(makeshortif($port['ifDescr']));

    $auth = true;

    $rrd_filename = $config['rrd_dir'].'/'.$device['hostname'].'/port-'.safename($port['ifIndex'].'.rrd');
}