librenms/includes/discovery/sensors/entity-sensor.inc.php

<?php

echo ' ENTITY-SENSOR: ';

echo 'Caching OIDs:';

if (!is_array($entity_array)) {
    $entity_array = array();
    echo ' entPhysicalDescr';
    $entity_array = snmpwalk_cache_multi_oid($device, 'entPhysicalDescr', $entity_array, 'CISCO-ENTITY-SENSOR-MIB');
    echo ' entPhysicalName';
    $entity_array = snmpwalk_cache_multi_oid($device, 'entPhysicalName', $entity_array, 'CISCO-ENTITY-SENSOR-MIB');
}

$oids = array();
echo ' entPhySensorType';
$oids = snmpwalk_cache_multi_oid($device, 'entPhySensorType', $oids, 'ENTITY-SENSOR-MIB');
echo ' entPhySensorScale';
$oids = snmpwalk_cache_multi_oid($device, 'entPhySensorScale', $oids, 'ENTITY-SENSOR-MIB');
echo ' entPhySensorPrecision';
$oids = snmpwalk_cache_multi_oid($device, 'entPhySensorPrecision', $oids, 'ENTITY-SENSOR-MIB');
echo ' entPhySensorValue';
$oids = snmpwalk_cache_multi_oid($device, 'entPhySensorValue', $oids, 'ENTITY-SENSOR-MIB');

$entitysensor['voltsDC']   = 'voltage';
$entitysensor['voltsAC']   = 'voltage';
$entitysensor['amperes']   = 'current';
$entitysensor['watts']     = 'power';
$entitysensor['hertz']     = 'freq';
$entitysensor['percentRH'] = 'humidity';
$entitysensor['rpm']       = 'fanspeed';
$entitysensor['celsius']   = 'temperature';
$entitysensor['dBm']       = 'dbm';

if (is_array($oids)) {
    foreach ($oids as $index => $entry) {
        // echo("[" . $entry['entPhySensorType'] . "|" . $entry['entPhySensorValue']. "|" . $index . "]");
        if ($entitysensor[$entry['entPhySensorType']] && is_numeric($entry['entPhySensorValue']) && is_numeric($index)) {
            $entPhysicalIndex = $index;
            $oid              = '.1.3.6.1.2.1.99.1.1.1.4.'.$index;
            $current          = $entry['entPhySensorValue'];
            // ENTITY-SENSOR-MIB::entPhySensorUnitsDisplay.11 = STRING: "C"
            $descr = $entity_array[$index]['entPhysicalName'];
            // if ($descr || $device['os'] == "iosxr")
            if ($descr) {
                $descr = rewrite_entity_descr($descr);
            } else {
                $descr = $entity_array[$index]['entPhysicalDescr'];
                $descr = rewrite_entity_descr($descr);
            }

            $valid_sensor = check_entity_sensor($descr, $device);

            $type = $entitysensor[$entry['entPhySensorType']];

            // FIXME this stuff is foul
            if ($entry['entPhySensorScale'] == 'nano') {
                $divisor    = '1000000000';
                $multiplier = '1';
            }

            if ($entry['entPhySensorScale'] == 'micro') {
                $divisor    = '1000000';
                $multiplier = '1';
            }

            if ($entry['entPhySensorScale'] == 'milli') {
                $divisor    = '1000';
                $multiplier = '1';
            }

            if ($entry['entPhySensorScale'] == 'units') {
                $divisor    = '1';
                $multiplier = '1';
            }

            if ($entry['entPhySensorScale'] == 'kilo') {
                $divisor    = '1';
                $multiplier = '1000';
            }

            if ($entry['entPhySensorScale'] == 'mega') {
                $divisor    = '1';
                $multiplier = '1000000';
            }

            if ($entry['entPhySensorScale'] == 'giga') {
                $divisor    = '1';
                $multiplier = '1000000000';
            }

            if ($entry['entPhySensorScale'] == 'yocto') {
                $divisor    = '1';
                $multiplier = '1';
            }

            if (is_numeric($entry['entPhySensorPrecision']) && $entry['entPhySensorPrecision'] > '0') {
                $divisor = $divisor.str_pad('', $entry['entPhySensorPrecision'], '0');
            }

            $current = ($current * $multiplier / $divisor);

            if ($type == 'temperature') {
                if ($current > '200') {
                    $valid_sensor = false;
                } $descr = preg_replace('/[T|t]emperature[|s]/', '', $descr);
            }

            // echo($descr . "|" . $index . "|" .$current . "|" . $multiplier . "|" . $divisor ."|" . $entry['entPhySensorScale'] . "|" . $entry['entPhySensorPrecision'] . "\n");
            if ($current == '-127' || ($device['os'] == 'asa' && str_contains($device['hardware'], 'sc'))) {
                $valid_sensor = false;
            }

            if ($valid_sensor && dbFetchCell("SELECT COUNT(*) FROM `sensors` WHERE device_id = ? AND `sensor_class` = ? AND `sensor_type` = 'cisco-entity-sensor' AND `sensor_index` = ?", array($device['device_id'], $type, $index)) == '0') {
                // Check to make sure we've not already seen this sensor via cisco's entity sensor mib
                discover_sensor($valid['sensor'], $type, $device, $oid, $index, 'entity-sensor', $descr, $divisor, $multiplier, null, null, null, null, $current);
            }
        }//end if
    }//end foreach
}//end if

echo "\n";