<?php
/**
 * Observium
 *
 *   This file is part of Observium.
 *
 * @package    observium
 * @subpackage discovery
 * @copyright  (C) 2006-2013 Adam Armstrong, (C) 2013-2020 Observium Limited
 *
 */

/*
DCN-MIB::vlanName.1 = STRING: "default"
DCN-MIB::vlanName.41 = STRING: "p2p-ats327"
DCN-MIB::vlanName.52 = STRING: "mgmt25"
DCN-MIB::vlanPortNumber.1 = INTEGER: 52
DCN-MIB::vlanPortNumber.41 = INTEGER: 1
DCN-MIB::vlanPortNumber.52 = INTEGER: 24
DCN-MIB::vlanRowStatus.1 = INTEGER: active(1)
DCN-MIB::vlanRowStatus.41 = INTEGER: active(1)
DCN-MIB::vlanRowStatus.52 = INTEGER: active(1)
*/

$vlan_oids = snmpwalk_cache_oid($device, 'vlanInfoTable', [], 'DCN-MIB');
print_debug_vars($vlan_oids);

$vtp_domain_index = '1'; // Yep, always use domain index 1

foreach ($vlan_oids as $vlan_num => $vlan)
{
  // Skip not exist vlans
  if ($vlan['vlanRowStatus'] != 'active') { continue; }

  $vlan_array = [
    'ifIndex'     => $vlan['vlanPortNumber'],
    'vlan_domain' => $vtp_domain_index,
    'vlan_vlan'   => $vlan_num,
    'vlan_name'   => strlen($vlan['vlanName']) ? $vlan['vlanName'] : "Vlan $vlan_num",
    //'vlan_mtu'    => $vlan[''],
    'vlan_type'   => 'ethernet',
    'vlan_status' => 'operational'
  ];

  $discovery_vlans[$vtp_domain_index][$vlan_num] = $vlan_array;
}

$ports_vlans_oids = snmpwalk_cache_oid($device, 'portMode', [], 'DCN-MIB');
$oids = [];
foreach ($ports_vlans_oids as $ifIndex => $entry)
{
  if ($entry['portMode'] == 'trunk')
  {
    $oids[] = 'portTrunkAllowedvlan';
  }
  elseif ($entry['portMode'] == 'hybrid')
  {
    $oids[] = 'portHybridTaggedAllowedvlan';
  }
}
foreach (array_unique($oids) as $oid)
{
  $ports_vlans_oids = snmpwalk_cache_oid($device, $oid, $ports_vlans_oids, 'DCN-MIB', NULL, OBS_SNMP_ALL_MULTILINE | OBS_SNMP_HEX);
}
print_debug_vars($ports_vlans_oids);

foreach ($ports_vlans_oids as $ifIndex => $entry)
{

  if ($entry['portMode'] == 'trunk')
  {
    $binary = hex2binmap($entry['portTrunkAllowedvlan']);
  }
  elseif ($entry['portMode'] == 'hybrid')
  {
    $binary = hex2binmap($entry['portHybridTaggedAllowedvlan']);
  } else {
    continue;
  }

  // Assign binary vlans map to ports
  $length = strlen($binary);
  for ($i = 0; $i < $length; $i++)
  {
    if ($binary[$i] && $i > 0)
    {
      $vlan_num = $i;

      //print_debug("ifIndex = $ifIndex, \$i = $i, mode {$entry['portMode']}");
      if (isset($discovery_vlans[$vtp_domain_index][$vlan_num]))
      {
        $discovery_ports_vlans[$ifIndex][$vlan_num] = array('vlan' => $vlan_num);
      }
    }
  }

}

// EOF