librenms-librenms/includes/discovery/arp-table.inc.php

<?php

unset($mac_table);

echo 'ARP Table : ';

if( key_exists('vrf_lite_cisco', $device) && (count($device['vrf_lite_cisco'])!=0) ){
    $vrfs_lite_cisco = $device['vrf_lite_cisco'];
}
else  {
    $vrfs_lite_cisco = array(array('context_name'=>null));
}

foreach ($vrfs_lite_cisco as $vrf) {
    $device['context_name']=$vrf['context_name'];

$ipNetToMedia_data = snmp_walk($device, 'ipNetToMediaPhysAddress', '-Oq', 'IP-MIB');
$ipNetToMedia_data = str_replace('ipNetToMediaPhysAddress.', '', trim($ipNetToMedia_data));
$ipNetToMedia_data = str_replace('IP-MIB::', '', trim($ipNetToMedia_data));

foreach (explode("\n", $ipNetToMedia_data) as $data) {
    list($oid, $mac) = explode(' ', $data);
    list($if, $first, $second, $third, $fourth) = explode('.', $oid);
    $ip = $first.'.'.$second.'.'.$third.'.'.$fourth;
    if ($ip != '...') {
        $interface = dbFetchRow('SELECT * FROM `ports` WHERE `device_id` = ? AND `ifIndex` = ?', array($device['device_id'], $if));

        list($m_a, $m_b, $m_c, $m_d, $m_e, $m_f) = explode(':', $mac);
        $m_a  = zeropad($m_a);
        $m_b  = zeropad($m_b);
        $m_c  = zeropad($m_c);
        $m_d  = zeropad($m_d);
        $m_e  = zeropad($m_e);
        $m_f  = zeropad($m_f);
        $md_a = hexdec($m_a);
        $md_b = hexdec($m_b);
        $md_c = hexdec($m_c);
        $md_d = hexdec($m_d);
        $md_e = hexdec($m_e);
        $md_f = hexdec($m_f);
        $mac  = "$m_a:$m_b:$m_c:$m_d:$m_e:$m_f";

        $mac_table[$if][$mac]['ip']       = $ip;
        $mac_table[$if][$mac]['ciscomac'] = "$m_a$m_b.$m_c$m_d.$m_e$m_f";
        $clean_mac = $m_a.$m_b.$m_c.$m_d.$m_e.$m_f;
        $mac_table[$if][$mac]['cleanmac'] = $clean_mac;
        $port_id = $interface['port_id'];
        $mac_table[$port_id][$clean_mac] = 1;

        if (dbFetchCell('SELECT COUNT(*) from ipv4_mac WHERE port_id = ? AND ipv4_address = ?', array($interface['port_id'], $ip))) {
            // Commented below, no longer needed but leaving for reference.
            // $sql = "UPDATE `ipv4_mac` SET `mac_address` = '$clean_mac' WHERE port_id = '".$interface['port_id']."' AND ipv4_address = '$ip'";
            $old_mac = dbFetchCell('SELECT mac_address from ipv4_mac WHERE ipv4_address=? AND port_id=?', array($ip, $interface['port_id']));

            if ($clean_mac != $old_mac && $clean_mac != '' && $old_mac != '') {
                d_echo("Changed mac address for $ip from $old_mac to $clean_mac\n");

                log_event("MAC change: $ip : ".mac_clean_to_readable($old_mac).' -> '.mac_clean_to_readable($clean_mac), $device, 'interface', $interface['port_id']);
            }

            dbUpdate(array('mac_address' => $clean_mac, 'context_name' => $device['context_name']), 'ipv4_mac', 'port_id=? AND ipv4_address=?', array($interface['port_id'], $ip));
            echo '.';
        }
        else if (isset($interface['port_id'])) {
            echo '+';
            // echo("Add MAC $mac\n");
            $insert_data = array(
                            'port_id'      => $interface['port_id'],
                            'mac_address'  => $clean_mac,
                            'ipv4_address' => $ip,
                            'context_name' => $device['context_name'],
                           );
            dbInsert($insert_data, 'ipv4_mac');
        }//end if
    }//end if
}//end foreach

$sql = "SELECT * from ipv4_mac AS M, ports as I WHERE M.port_id = I.port_id and I.device_id = '".$device['device_id']."'";
foreach (dbFetchRows($sql) as $entry) {
    $entry_mac = $entry['mac_address'];
    $entry_if  = $entry['port_id'];
    if (!$mac_table[$entry_if][$entry_mac]) {
        dbDelete('ipv4_mac', '`port_id` = ? AND `mac_address` = ?', array($entry_if, $entry_mac));
        d_echo("Removing MAC $entry_mac from interface ".$interface['ifName']);

        echo '-';
    }
}
echo "\n";
unset($mac);
    unset($device['context_name']);
}
unset($vrfs_c);