<?php
/**
 * Observium
 *
 *   This file is part of Observium.
 *
 * @package        observium
 * @subpackage     discovery
 * @copyright  (C) 2006-2013 Adam Armstrong, (C) 2013-2023 Observium Limited
 *
 */

// lldpRemoteSystemsData: lldpRemTable + lldpRemManAddrTable + lldpRemUnknownTLVTable + lldpRemOrgDefInfoTable
$lldpRemTable_oids = ['lldpRemChassisIdSubtype', 'lldpRemChassisId',
                      'lldpRemPortIdSubtype', 'lldpRemPortId', 'lldpRemPortDesc',
                      'lldpRemSysName'];
$lldp_array        = [];
foreach ($lldpRemTable_oids as $oid) {
    //$lldp_array = snmpwalk_cache_threepart_oid($device, $oid, $lldp_array, "LLDP-MIB");
    $lldp_array = snmpwalk_cache_oid($device, $oid, $lldp_array, "LLDP-MIB");

    if (empty($lldp_array)) {
        break;
    } // Stop walk if no data
}

if ($lldp_array) {
    // lldpRemSysDesc can be multiline
    //$lldp_array = snmpwalk_cache_threepart_oid($device, 'lldpRemPortDesc', $lldp_array, "LLDP-MIB", NULL, OBS_SNMP_ALL_MULTILINE);
    //$lldp_array = snmpwalk_cache_threepart_oid($device, 'lldpRemSysDesc', $lldp_array, "LLDP-MIB", NULL, OBS_SNMP_ALL_MULTILINE);
    $lldp_array = snmpwalk_cache_oid($device, 'lldpRemSysDesc', $lldp_array, "LLDP-MIB", NULL, OBS_SNMP_ALL_MULTILINE);

    if (is_device_mib($device, 'LLDP-EXT-MED-MIB')) {
        // See Cumulus Linux
        // not exist lldpRemSysName, lldpRemSysDesc
        $lldp_array = snmpwalk_cache_oid($device, 'lldpXMedRemSoftwareRev', $lldp_array, "LLDP-EXT-MED-MIB", NULL, OBS_SNMP_ALL_MULTILINE);
        $lldp_array = snmpwalk_cache_oid($device, 'lldpXMedRemMfgName', $lldp_array, "LLDP-EXT-MED-MIB", NULL, OBS_SNMP_ALL_MULTILINE);
        $lldp_array = snmpwalk_cache_oid($device, 'lldpXMedRemModelNam', $lldp_array, "LLDP-EXT-MED-MIB", NULL, OBS_SNMP_ALL_MULTILINE);
    }

    // lldpRemManAddrTable
    // Case 1:
    // LLDP-MIB::lldpRemManAddrSubtype.120.30001.1582.1.4.10.133.3.10 = INTEGER: ipV4(1)
    // LLDP-MIB::lldpRemManAddr.120.30001.1582.1.4.10.133.3.10 = Hex-STRING: 0A 85 03 0A
    // LLDP-MIB::lldpRemManAddrIfSubtype.120.30001.1582.1.4.10.133.3.10 = INTEGER: ifIndex(2)
    // LLDP-MIB::lldpRemManAddrIfId.120.30001.1582.1.4.10.133.3.10 = INTEGER: 2009
    // LLDP-MIB::lldpRemManAddrOID.120.30001.1582.1.4.10.133.3.10 = OID: SNMPv2-SMI::zeroDotZero.0
    // Case 2:
    // LLDP-MIB::lldpRemManAddrIfSubtype.1173570000.129.2.1.4.10.0.10.5 = INTEGER: unknown(1)
    // LLDP-MIB::lldpRemManAddrIfSubtype.1173834000.4.6.0.6.132.181.156.89.235.128 = INTEGER: unknown(1)
    // LLDP-MIB::lldpRemManAddrIfId.1173570000.129.2.1.4.10.0.10.5 = INTEGER: 0
    // LLDP-MIB::lldpRemManAddrIfId.1173834000.4.6.0.6.132.181.156.89.235.128 = INTEGER: 0
    // LLDP-MIB::lldpRemManAddrOID.1173570000.129.2.1.4.10.0.10.5 = OID: SNMPv2-SMI::enterprises.14823.2.2.1.2.1.1
    // LLDP-MIB::lldpRemManAddrOID.1173834000.4.6.0.6.132.181.156.89.235.128 = OID: SNMPv2-SMI::enterprises.14823.2.2.1.2.1.7
    // Case 3:
    // LLDP-MIB::lldpRemManAddrIfId.0.2.1.1.4.10.137.41.4 = INTEGER: 0
    // LLDP-MIB::lldpRemManAddrIfId.0.3.1.1.4.10.137.41.57 = INTEGER: 2009
    // LLDP-MIB::lldpRemManAddrIfId.0.47.1.1.4.10.137.41.19 = INTEGER: 2009
    // LLDP-MIB::lldpRemManAddrIfId.0.49.3.1.4.10.129.2.171 = INTEGER: 34
    // LLDP-MIB::lldpRemManAddrIfId.0.49.3.2.16.42.2.32.40.255.0.0.0.0.0.0.1.0.0.1.113 = INTEGER: 34
    // LLDP-MIB::lldpRemManAddrIfId.0.49.4.1.4.10.129.2.171 = INTEGER: 19
    // LLDP-MIB::lldpRemManAddrIfId.0.49.4.2.16.42.2.32.40.255.0.0.0.0.0.0.1.0.0.1.113 = INTEGER: 19
    // LLDP-MIB::lldpRemManAddrIfId.0.53.2.1.4.10.129.2.171 = INTEGER: 23
    // LLDP-MIB::lldpRemManAddrIfId.0.53.2.2.16.42.2.32.40.255.0.0.0.0.0.0.1.0.0.1.113 = INTEGER: 23
    // Case 4:
    // LLDP-MIB::lldpRemManAddrSubtype.22 = INTEGER: ipV4(1)
    // LLDP-MIB::lldpRemManAddrSubtype.86 = INTEGER: ipV6(2)
    // LLDP-MIB::lldpRemManAddr.22 = STRING: "10.31.0.2"
    // LLDP-MIB::lldpRemManAddr.86 = STRING: "fe80::d6ca:6dff:fe8e:8b3f"
    // Case 5 (multiple IP addresses):
    // lldpRemManAddrIfId.31300.2.2.1.4.192.168.13.1 = 5
    // lldpRemManAddrIfId.31300.2.2.2.16.32.1.4.112.0.40.11.253.0.0.0.0.0.0.0.0 = 5
    // lldpRemManAddrIfId.31300.2.2.2.16.254.128.0.0.0.0.0.0.198.173.52.255.254.216.108.126 = 5
    $lldp_addr = snmpwalk_cache_oid($device, 'lldpRemManAddrIfId', [], "LLDP-MIB", NULL, OBS_SNMP_ALL_NUMERIC_INDEX);
    $lldp_addr = snmpwalk_cache_oid($device, 'lldpRemManAddr', $lldp_addr, "LLDP-MIB", NULL, OBS_SNMP_ALL_NUMERIC_INDEX);

    foreach ($lldp_addr as $index => $entry) {
        if (isset($lldp_array[$index])) {
            $lldp_array[$index] = array_merge($lldp_array[$index], $entry);
            if (isset($entry['lldpRemManAddr'])) {
                $addr                                    = hex2ip($entry['lldpRemManAddr']);
                $lldp_array[$index]['lldpRemMan'][$addr] = $entry; // For multiple entries
            }
            continue;
        }
        $index_array = explode('.', $index);
        // LLDP index
        $lldpRemTimeMark     = array_shift($index_array);
        $lldpRemLocalPortNum = array_shift($index_array);
        $lldpRemIndex        = array_shift($index_array);
        $lldp_index          = "$lldpRemTimeMark.$lldpRemLocalPortNum.$lldpRemIndex";
        if (!isset($lldp_array[$lldp_index])) {
            continue;
        }
        $lldp_array[$lldp_index] = array_merge($lldp_array[$lldp_index], $entry);

        // Already exist Oid, just merge
        // if (isset($entry['lldpRemManAddr']))
        // {
        //   continue;
        // }

        // Convert from index part
        $lldpAddressFamily = array_shift($index_array);
        $len               = array_shift($index_array);
        $addr              = implode('.', $index_array);
        if (isset($entry['lldpRemManAddr'])) {
            // Already exist Oid, just merge
            $addr = hex2ip($entry['lldpRemManAddr']);
            //continue;
        } elseif ($lldpAddressFamily == 1 || $len == 4) {
            // IPv4, ie: 4.10.129.2.171
            $lldp_array[$lldp_index]['lldpRemManAddr'] = $addr;
        } elseif ($lldpAddressFamily == 2 || $len == 16) {
            // IPv6, ie: 16.42.2.32.40.255.0.0.0.0.0.0.1.0.0.1.113
            $addr                                      = snmp2ipv6($addr);
            $lldp_array[$lldp_index]['lldpRemManAddr'] = $addr;
        } elseif ($lldpAddressFamily == 0 && $len == 6) {
            // Hrm, I really not know what is this, ie, seems as MAC address:
            // 6 132.181.156.89.235.128 84:B5:9C:59:EB:80
            continue;
        }
        $lldp_array[$lldp_index]['lldpRemMan'][$addr] = $entry; // For multiple entries
    }
}

print_debug_vars($lldp_array, 1);

if ($lldp_array) {
    $dot1d_array = snmp_cache_table($device, "dot1dBasePortIfIndex", [], "BRIDGE-MIB");
    //$lldp_local_array = snmpwalk_cache_oid($device, "lldpLocalSystemData", array(), "LLDP-MIB");
    $lldp_local_array = snmpwalk_cache_oid($device, "lldpLocPortEntry", [], "LLDP-MIB");

    foreach ($lldp_array as $index => $lldp) {
        if (str_contains_array($index, '.')) {
            // This is correct RFC case:
            // LLDP-MIB::lldpRemChassisIdSubtype.0.0.1 = INTEGER: macAddress(4)
            [$lldpRemTimeMark, $lldpRemLocalPortNum, $lldpRemIndex] = explode('.', $index);
        } else {
            // Incorrect case (ie on old RouterOS):
            // LLDP-MIB::lldpRemChassisIdSubtype.1495 = INTEGER: macAddress(4)
            $lldpRemTimeMark     = 0;
            $lldpRemLocalPortNum = 0;
            $lldpRemIndex        = $index;
        }

        // Detect local device port
        $port = NULL;

        // Prefer by LLDP-MIB
        if (!$port && !empty($lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortDesc'])) {
            //lldpLocPortIdSubtype.15 = interfaceName
            //lldpLocPortIdSubtype.16 = interfaceName
            //lldpLocPortId.15 = "Te1/15"
            //lldpLocPortId.16 = "Te1/16"
            //lldpLocPortDesc.15 = TenGigabitEthernet1/15
            //lldpLocPortDesc.16 = TenGigabitEthernet1/16
            $ifName = $lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortDesc'];
            if ($ifName === 'OOBM') {
                // procurve:
                // ifDescr.5481 = Out Of Band Management Port
                // ifDescr.5492 = Out Of Band Management loopback Interface
                // ifName.5481 = oobm0
                // ifName.5492 = lo0
                // lldpLocPortIdSubtype.4000 = local
                // lldpLocPortId.4000 = "4000"
                // lldpLocPortDesc.4000 = OOBM
                $ifName .= '0';
            }
            $port = dbFetchRow("SELECT * FROM `ports` WHERE `device_id` = ? AND `deleted` = ? AND (`ifName`= ? OR `ifDescr` = ? OR `port_label_short` = ?)", [$device['device_id'], 0, $ifName, $ifName, $ifName]);
        }

        // By BRIDGE-MIB (Warning, seems as more hard on multiple platforms not correctly association with ifIndex for LLDP)
        if (!$port && is_numeric($dot1d_array[$lldpRemLocalPortNum]['dot1dBasePortIfIndex']) &&
            !in_array($device['os'], ['junos', 'dell-os10'])) { // Incorrect association on this platforms
            // Get the port using BRIDGE-MIB
            $ifIndex = $dot1d_array[$lldpRemLocalPortNum]['dot1dBasePortIfIndex'];

            $port = dbFetchRow("SELECT * FROM `ports` WHERE `device_id` = ? AND `deleted` = ? AND `ifIndex` = ? AND `ifDescr` NOT LIKE 'Vlan%'", [$device['device_id'], 0, $ifIndex]);
        }

        // last try by lldpLocPortId, also see below for remote port
        if (!$port) {
            switch ($lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortIdSubtype']) {
                case 'interfaceName':
                    $ifName = snmp_hexstring($lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortId']);
                    $port   = dbFetchRow("SELECT * FROM `ports` WHERE `device_id` = ? AND `deleted` = ? AND (`ifName` = ? OR `ifDescr` = ? OR `port_label_short` = ?)", [$device['device_id'], 0, $ifName, $ifName, $ifName]);
                    break;

                case 'interfaceAlias':
                    $ifAlias = snmp_hexstring($lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortId']);
                    $port    = dbFetchRow("SELECT * FROM `ports` WHERE `device_id` = ? AND `deleted` = ? AND `ifAlias` = ?", [$device['device_id'], 0, $ifAlias]);
                    break;

                case 'macAddress':
                    $ifPhysAddress = strtolower(str_replace(' ', '', $lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortId']));
                    $port          = dbFetchRow("SELECT * FROM `ports` WHERE `device_id` = ? AND `deleted` = ? AND `ifPhysAddress` = ?", [$device['device_id'], 0, $ifPhysAddress]);
                    break;

                case 'networkAddress':
                    $ip = snmp_hexstring($lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortId']);
                    /*
                    $ip_version = get_ip_version($id);
                    if ($ip_version)
                    {
                      $ip = ($ip_version === 6 ? Net_IPv6::uncompress($id, TRUE) : $id);
                      $port = dbFetchRow("SELECT * FROM `ipv".$ip_version."_addresses` LEFT JOIN `ports` USING (`port_id`) WHERE `ipv".$ip_version."_address` = ? AND `device_id` = ?", array($ip, $device['device_id']));
                    }
                    unset($id, $ip);
                    */
                    $peer_where = generate_query_values_and($device['device_id'], 'device_id'); // Additional filter for include self IPs
                    // Fetch all devices with peer IP and filter by UP
                    if ($ids = get_entity_ids_ip_by_network('port', $ip, $peer_where)) {
                        $port = get_port_by_id_cache($ids[0]);
                    }

                    break;
            }
        }

        // Ohh still unknown port? this is not should happen, but this derp LLDP implementation on your device
        if (!$port && is_numeric($lldpRemLocalPortNum)) {
            print_debug('WARNING. Local port for neighbour not found, used incorrect lldpRemLocalPortNum as ifIndex.');
            $ifIndex = $lldpRemLocalPortNum; // This is incorrect, not really ifIndex, but seems sometime this numbers same
            $port    = dbFetchRow("SELECT * FROM `ports` WHERE `device_id` = ? AND `deleted` = ? AND `ifIndex` = ? AND `ifDescr` NOT LIKE 'Vlan%'", [$device['device_id'], 0, $ifIndex]);
            if (!$port && $device['os'] === 'ciena-waveserveros') {
                $ifName = 'PORT-' . snmp_hexstring($lldp_local_array[$lldpRemLocalPortNum]['lldpLocPortId']);
                $port   = dbFetchRow("SELECT * FROM `ports` WHERE `device_id` = ? AND `deleted` = ? AND (`ifName` = ? OR `ifDescr` = ? OR `port_label_short` = ?)", [$device['device_id'], 0, $ifName, $ifName, $ifName]);
            }
        }

        $remote_device_id = FALSE;
        $remote_port_id   = NULL;

        // Sometime lldpRemPortDesc is not set
        if (!isset($lldp['lldpRemPortDesc'])) {
            $lldp['lldpRemPortDesc'] = '';
        }

        $remote_mac = $lldp['lldpRemChassisIdSubtype'] === 'macAddress' ? $lldp['lldpRemChassisId'] : NULL;

        // lldpRemPortId can be hex string
        if ($lldp['lldpRemPortIdSubtype'] !== 'macAddress') {
            // On Extreme platforms, they remove the leading 1: from ports. Put it back if there isn't a :.
            if (preg_match('/^ExtremeXOS.*$/', $lldp['lldpRemSysDesc'])) {
                if (!preg_match('/\:/', $lldp['lldpRemPortId'])) {
                    $lldp['lldpRemPortId'] = '1:' . $lldp['lldpRemPortId'];
                }
            } else {
                //$lldp['lldpRemPortId'] = snmp_hexstring($lldp['lldpRemPortId']);
            }
        } elseif (safe_empty($remote_mac)) {
            $remote_mac = $lldp['lldpRemPortId'];
        }

        // Clean MAC & IP
        if (isset($lldp['lldpRemMan']) && count($lldp['lldpRemMan']) > 1) {
            // Multiple IP addresses.. detect best?
            foreach (array_keys($lldp['lldpRemMan']) as $addr) {
                $addr_version = get_ip_version($addr);
                $addr_type    = get_ip_type($addr);
                if (in_array($addr_type, ['unspecified', 'loopback', 'reserved', 'multicast'])) {
                    continue;
                }
                if ($addr_version == 6 && $addr_type === 'link-local') {
                    continue;
                }
                if ($addr_type === 'unicast') {
                    // Prefer IPv4/IPv6 unicast
                    $lldp['lldpRemManAddr'] = $addr;
                    break;
                }
                if ($addr_version == 4) {
                    // Than prefer IPv4
                    $lldp['lldpRemManAddr'] = $addr;
                    break;
                }
                $lldp['lldpRemManAddr'] = $addr;
            }
            print_debug("Multiple remote IP addresses detect, selected: $addr");
            print_debug_vars($lldp);
        }
        if (isset($lldp['lldpRemManAddr'])) {
            $lldp['lldpRemManAddr'] = hex2ip($lldp['lldpRemManAddr']);
        }

        // Cumulus Linux have empty lldpRemSysDesc
        if (!isset($lldp['lldpRemSysDesc']) && isset($lldp['lldpXMedRemModelName'])) {
            $lldp['lldpRemSysDesc'] = trim($lldp['lldpXMedRemMfgName'] . ' ' . $lldp['lldpXMedRemModelName']);
        }
        $lldp['lldpRemSysVersion'] = safe_empty($lldp['lldpXMedRemSoftwareRev']) ? NULL : $lldp['lldpXMedRemSoftwareRev'];

        // Remote sysname is MAC in some cases
        // lldpRemChassisIdSubtype.0.16.1 = macAddress
        // lldpRemChassisId.0.16.1 = "40 E3 D6 CE 8A 9A "
        // lldpRemPortIdSubtype.0.16.1 = macAddress
        // lldpRemPortId.0.16.1 = "40 E3 D6 CE 8A 9A "
        // lldpRemSysName.0.16.1 = 40:e3:d6:ce:8a:9a
        // lldpRemManAddrIfId.0.16.1.1.4.10.10.14.132 = 8
        if (preg_match('/^[a-f\d]{2}([: ][a-f\d]{2}){5}$/', $lldp['lldpRemSysName']) && get_ip_version($lldp['lldpRemManAddr'])) {
            // Replace by IP address for better discovery
            print_debug("LLDP hostname replaced: " . $lldp['lldpRemSysName'] . " -> " . $lldp['lldpRemManAddr']);
            $lldp['lldpRemSysName'] = $lldp['lldpRemManAddr'];
        } elseif (safe_empty($lldp['lldpRemSysName']) && !safe_empty($lldp['lldpRemSysDesc'])) {
            if ($lldp['lldpRemChassisIdSubtype'] === 'macAddress') {
                // use mac address instead empty hostname:
                // lldpRemChassisIdSubtype.89.3.1 = macAddress
                // lldpRemChassisId.89.3.1 = "6C B0 CE 12 A9 A8 "
                // lldpRemPortIdSubtype.89.3.1 = local
                // lldpRemPortId.89.3.1 = "g25"
                // lldpRemPortDesc.89.3.1 = g25
                // lldpRemSysName.89.3.1 =
                // lldpRemSysDesc.89.3.1 = GS724Tv4 ProSafe 24-port Gigabit Ethernet Smart Switch, 6.3.1.4, B1.0.0.4
                // lldpRemManAddrIfId.89.3.1.1.4.192.168.0.239 = 51
                $lldp['lldpRemSysName'] = str_replace([' ', '-'], '', strtolower($lldp['lldpRemChassisId']));
            } elseif ($lldp['lldpRemChassisIdSubtype'] === 'networkAddress' &&
                      preg_match('/^01 (?<ip>([A-F\d]{2}\s?){4})$/', $lldp['lldpRemChassisId'], $matches)) {
                $lldp['lldpRemSysName'] = hex2ip($matches['ip']);
            }
        }

        // Try find remote device and check if already cached
        $remote_device_id = get_autodiscovery_device_id($device, $lldp['lldpRemSysName'], $lldp['lldpRemManAddr'], $remote_mac);
        if (is_null($remote_device_id) &&                                                         // NULL - never cached in other rounds
            check_autodiscovery($lldp['lldpRemSysName'], $lldp['lldpRemManAddr'])) // Check all previous autodiscovery rounds
        {
            // Neighbour never checked, try autodiscovery
            $remote_device_id = autodiscovery_device($lldp['lldpRemSysName'], $lldp['lldpRemManAddr'], 'LLDP', $lldp['lldpRemSysDesc'], $device, $port);
        }

        if ($remote_device_id) {
            $if = $lldp['lldpRemPortDesc'];
            $id = trim($lldp['lldpRemPortId']);

            // lldpPortIdSubtype   -> lldpPortId
            //  interfaceAlias(1), ->  ifAlias
            //  portComponent(2),  ->  entPhysicalAlias
            //  macAddress(3),     ->  ifPhysAddress
            //  networkAddress(4), ->  IP address
            //  interfaceName(5),  ->  ifName
            //  agentCircuitId(6), ->  agent-local identifier of the circuit (defined in RFC 3046) (FIXME, not know)
            //  local(7)           ->  ifIndex
            switch ($lldp['lldpRemPortIdSubtype']) {
                case 'interfaceAlias':
                    $remote_port_id = dbFetchCell("SELECT `port_id` FROM `ports` WHERE (`ifAlias` = ? OR `ifDescr` = ? OR `port_label_short` = ?) AND `device_id` = ? AND `deleted` = ?", [$id, $if, $if, $remote_device_id, 0]);
                    break;

                case 'interfaceName':
                    // Try lldpRemPortId
                    $query          = 'SELECT `port_id` FROM `ports` WHERE (`ifName` = ? OR `ifDescr` = ? OR `port_label_short` = ?) AND `device_id` = ? AND `deleted` = ?';
                    $remote_port_id = dbFetchCell($query, [$id, $id, $id, $remote_device_id, 0]);
                    if (!$remote_port_id && !safe_empty($if)) {
                        // Try same by lldpRemPortDesc
                        $remote_port_id = dbFetchCell($query, [$if, $if, $if, $remote_device_id, 0]);
                    }
                    break;

                case 'macAddress':
                    $remote_port_id = get_port_id_by_mac($remote_device_id, $id);
                    if (!$remote_port_id && !safe_empty($if)) {
                        // Try same by lldpRemPortDesc
                        $query          = 'SELECT `port_id` FROM `ports` WHERE (`ifName` = ? OR `ifDescr` = ? OR `port_label_short` = ?) AND `device_id` = ? AND `deleted` = ?';
                        $remote_port_id = dbFetchCell($query, [$if, $if, $if, $remote_device_id, 0]);
                    }
                    break;

                case 'networkAddress':
                    $ip_version = get_ip_version($id);
                    if ($ip_version) {
                        // Try by IP
                        $peer_where = generate_query_values_and($remote_device_id, 'device_id'); // Additional filter for include self IPs
                        // Fetch all devices with peer IP and filter by UP
                        if ($ids = get_entity_ids_ip_by_network('port', $id, $peer_where)) {
                            $remote_port_id = $ids[0];
                            //$port = get_port_by_id_cache($ids[0]);
                        }
                    }
                    break;

                case 'local':
                    // local not always ifIndex or FIXME (see: http://jira.observium.org/browse/OBSERVIUM-1716)
                    if (!ctype_digit($id)) {
                        // Not sure what should be if $id ifName and it just numeric
                        $query          = 'SELECT `port_id` FROM `ports` WHERE (`ifName` = ? OR `ifDescr` = ? OR `port_label_short` = ?) AND `device_id` = ? AND `deleted` = ?';
                        $remote_port_id = dbFetchCell($query, [$id, $id, $id, $remote_device_id, 0]);
                        if (!$remote_port_id) {
                            // Try same by lldpRemPortDesc
                            $remote_port_id = dbFetchCell($query, [$if, $if, $if, $remote_device_id, 0]);
                        }
                    }
                case 'ifIndex':
                    // These cases are handled by the ifDescr/ifIndex combination fallback below
                    break;

                default:
                    break;
            }

            if (!$remote_port_id && is_numeric($id)) // Not found despite our attempts above - fall back to try matching with ifDescr/ifIndex
            {
                $remote_port_id = dbFetchCell("SELECT `port_id` FROM `ports` WHERE (`ifIndex`= ? OR `ifDescr` = ?) AND `device_id` = ? AND `deleted` = ?", [$id, $if, $remote_device_id, 0]);
            }

            if (!$remote_port_id) // Still not found?
            {
                if ($lldp['lldpRemChassisIdSubtype'] === 'macAddress') {
                    // Find the port by chassis MAC address, only use this if exactly 1 match is returned, otherwise we'd link wrongly - think switches with 1 global MAC on all ports.
                    $remote_port_id = get_port_id_by_mac($remote_device_id, $lldp['lldpRemChassisId']);
                } else {
                    // Last chance
                    $query          = 'SELECT `port_id` FROM `ports` WHERE (`ifName` IN (?, ?) OR `ifDescr` IN (?, ?) OR `port_label_short` IN (?, ?)) AND `device_id` = ? AND `deleted` = ?';
                    $remote_port_id = dbFetchCell($query, [$id, $if, $id, $if, $id, $if, $remote_device_id, 0]);
                }
            }

            // Still not found? Seems as incorrect remote device :/
            if (!$remote_port_id) {
                print_debug("WARNING. Remote device found in db, but remote port not found. Seems as incorrect remote device association.");
            }
        }

        // FIXME. We can use lldpRemSysCapEnabled as platform, but they use BITS textual conversion:
        // LLDP-MIB::lldpRemSysCapEnabled.0.5.3 = BITS: 20 00 bridge(2)
        // LLDP-MIB::lldpRemSysCapEnabled.0.5.3 = "20 00 "
        $neighbour = [
          'remote_port_id'  => $remote_port_id,
          'remote_hostname' => $lldp['lldpRemSysName'],
          'remote_port'     => $lldp['lldpRemPortId'],
          'remote_platform' => $lldp['lldpRemSysDesc'],
          'remote_version'  => $lldp['lldpRemSysVersion'], //NULL,
          'remote_address'  => $lldp['lldpRemManAddr']
        ];
        discover_neighbour($port, 'lldp', $neighbour);
    }
}

// EOF