mirror of
https://github.com/librenms/librenms.git
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275 lines
10 KiB
PHP
275 lines
10 KiB
PHP
<?php
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/**
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* Core.php
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*
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* -Description-
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* @link https://www.librenms.org
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*
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* @copyright 2021 Tony Murray
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* @author Tony Murray <murraytony@gmail.com>
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*/
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namespace LibreNMS\Modules;
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use App\Models\Device;
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use Illuminate\Support\Str;
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use LibreNMS\Config;
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use LibreNMS\Interfaces\Module;
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use LibreNMS\OS;
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use LibreNMS\RRD\RrdDefinition;
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use LibreNMS\Util\Time;
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use Log;
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use SnmpQuery;
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class Core implements Module
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{
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public function discover(OS $os)
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{
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$snmpdata = SnmpQuery::numeric()->get(['SNMPv2-MIB::sysObjectID.0', 'SNMPv2-MIB::sysDescr.0', 'SNMPv2-MIB::sysName.0'])
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->values();
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$device = $os->getDevice();
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$device->fill([
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'sysObjectID' => $snmpdata['.1.3.6.1.2.1.1.2.0'] ?? null,
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'sysName' => strtolower(trim($snmpdata['.1.3.6.1.2.1.1.5.0'] ?? '')),
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'sysDescr' => isset($snmpdata['.1.3.6.1.2.1.1.1.0']) ? str_replace(chr(218), "\n", $snmpdata['.1.3.6.1.2.1.1.1.0']) : null,
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]);
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foreach ($device->getDirty() as $attribute => $value) {
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Log::event($value . ' -> ' . $device->$attribute, $device, 'system', 3);
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$os->getDeviceArray()[$attribute] = $value; // update device array
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}
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// detect OS
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$device->os = self::detectOS($device, false);
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if ($device->isDirty('os')) {
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Log::event('Device OS changed: ' . $device->getOriginal('os') . ' -> ' . $device->os, $device, 'system', 3);
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$os->getDeviceArray()['os'] = $device->os;
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echo 'Changed ';
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}
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// Set type to a predefined type for the OS if it's not already set
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$loaded_os_type = Config::get("os.$device->os.type");
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if (! $device->getAttrib('override_device_type') && $loaded_os_type != $device->type) {
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$device->type = $loaded_os_type;
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Log::debug("Device type changed to $loaded_os_type!");
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}
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$device->save();
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echo 'OS: ' . Config::getOsSetting($device->os, 'text') . " ($device->os)\n\n";
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}
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public function poll(OS $os)
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{
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$snmpdata = SnmpQuery::numeric()
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->get(['SNMPv2-MIB::sysDescr.0', 'SNMPv2-MIB::sysObjectID.0', 'SNMPv2-MIB::sysUpTime.0', 'SNMPv2-MIB::sysName.0'])
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->values();
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$device = $os->getDevice();
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$device->fill([
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'sysName' => str_replace("\n", '', strtolower($snmpdata['.1.3.6.1.2.1.1.5.0'] ?? '')),
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'sysObjectID' => $snmpdata['.1.3.6.1.2.1.1.2.0'] ?? null,
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'sysDescr' => str_replace(chr(218), "\n", $snmpdata['.1.3.6.1.2.1.1.1.0'] ?? ''),
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]);
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$this->calculateUptime($os, $snmpdata['.1.3.6.1.2.1.1.3.0'] ?? null);
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$device->save();
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}
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public function cleanup(OS $os)
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{
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// nothing to cleanup
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}
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/**
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* Detect the os of the given device.
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*
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* @param Device $device device to check
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* @param bool $fetch fetch sysDescr and sysObjectID fresh from the device
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* @return string the name of the os
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*
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* @throws \Exception
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*/
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public static function detectOS(Device $device, bool $fetch = true): string
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{
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if ($fetch) {
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// some devices act oddly when getting both OIDs at once
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$device->sysDescr = SnmpQuery::device($device)->get('SNMPv2-MIB::sysDescr.0')->value();
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$device->sysObjectID = SnmpQuery::device($device)->numeric()->get('SNMPv2-MIB::sysObjectID.0')->value();
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}
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Log::debug("| $device->sysDescr | $device->sysObjectID | \n");
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$deferred_os = [];
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$generic_os = [
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'airos',
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'freebsd',
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'linux',
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];
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// check yaml files
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$os_defs = Config::get('os');
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foreach ($os_defs as $os => $def) {
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if (isset($def['discovery']) && ! in_array($os, $generic_os)) {
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if (self::discoveryIsSlow($def)) {
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// defer all os that use snmpget or snmpwalk
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$deferred_os[] = $os;
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continue;
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}
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foreach ($def['discovery'] as $item) {
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if (self::checkDiscovery($device, $item, $def['mib_dir'] ?? null)) {
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return $os;
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}
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}
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}
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}
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// check deferred os
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$deferred_os = array_merge($deferred_os, $generic_os);
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foreach ($deferred_os as $os) {
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foreach ($os_defs[$os]['discovery'] as $item) {
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if (self::checkDiscovery($device, $item, $os_defs[$os]['mib_dir'] ?? null)) {
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return $os;
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}
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}
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}
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return 'generic';
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}
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/**
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* Check an array of conditions if all match, return true
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* sysObjectID if sysObjectID starts with any of the values under this item
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* sysDescr if sysDescr contains any of the values under this item
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* sysDescr_regex if sysDescr matches any of the regexes under this item
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* snmpget perform an snmpget on `oid` and check if the result contains `value`. Other subkeys: options, mib, mibdir
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*
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* Appending _except to any condition will invert the match.
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*
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* @param Device $device
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* @param array $array Array of items, keys should be sysObjectID, sysDescr, or sysDescr_regex
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* @param string|array $mibdir MIB directory for evaluated OS
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* @return bool the result (all items passed return true)
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*/
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protected static function checkDiscovery(Device $device, array $array, $mibdir): bool
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{
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// all items must be true
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foreach ($array as $key => $value) {
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if ($check = Str::endsWith($key, '_except')) {
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$key = substr($key, 0, -7);
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}
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if ($key == 'sysObjectID') {
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if (Str::startsWith($device['sysObjectID'], $value) == $check) {
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return false;
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}
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} elseif ($key == 'sysDescr') {
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if (Str::contains($device['sysDescr'], $value) == $check) {
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return false;
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}
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} elseif ($key == 'sysDescr_regex') {
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if (preg_match_any($device['sysDescr'], $value) == $check) {
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return false;
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}
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} elseif ($key == 'sysObjectID_regex') {
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if (preg_match_any($device['sysObjectID'], $value) == $check) {
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return false;
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}
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} elseif ($key == 'snmpget') {
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$get_value = SnmpQuery::device($device)
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->options($value['options'] ?? [])
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->mibDir($value['mib_dir'] ?? $mibdir)
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->get(isset($value['mib']) ? "{$value['mib']}::{$value['oid']}" : $value['oid'])
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->value();
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if (compare_var($get_value, $value['value'], $value['op'] ?? 'contains') == $check) {
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return false;
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}
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} elseif ($key == 'snmpwalk') {
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$walk_value = SnmpQuery::device($device)
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->options($value['options'] ?? [])
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->mibDir($value['mib_dir'] ?? $mibdir)
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->walk(isset($value['mib']) ? "{$value['mib']}::{$value['oid']}" : $value['oid'])
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->raw();
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if (compare_var($walk_value, $value['value'], $value['op'] ?? 'contains') == $check) {
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return false;
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}
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}
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}
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return true;
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}
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private function calculateUptime(OS $os, ?string $sysUpTime): void
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{
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global $agent_data;
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$device = $os->getDevice();
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if (Config::get("os.$device->os.bad_uptime")) {
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return;
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}
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if (! empty($agent_data['uptime'])) {
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$uptime = round((float) substr($agent_data['uptime'], 0, strpos($agent_data['uptime'], ' ')));
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echo "Using UNIX Agent Uptime ($uptime)\n";
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} else {
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$uptime_data = SnmpQuery::make()->get(['SNMP-FRAMEWORK-MIB::snmpEngineTime.0', 'HOST-RESOURCES-MIB::hrSystemUptime.0'])->values();
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$uptime = max(
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round($sysUpTime / 100),
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Config::get("os.$device->os.bad_snmpEngineTime") ? 0 : $uptime_data['SNMP-FRAMEWORK-MIB::snmpEngineTime.0'],
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Config::get("os.$device->os.bad_hrSystemUptime") ? 0 : round($uptime_data['HOST-RESOURCES-MIB::hrSystemUptime.0'] / 100)
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);
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Log::debug("Uptime seconds: $uptime\n");
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}
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// set it if unless it is wrong
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if ($uptime > 0) {
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if ($uptime < $device->uptime) {
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Log::event('Device rebooted after ' . Time::formatInterval($device->uptime) . " -> {$uptime}s", $device, 'reboot', 4, $device->uptime);
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if (Config::get('discovery_on_reboot')) {
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$device->last_discovered = null;
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$device->save();
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}
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}
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app('Datastore')->put($os->getDeviceArray(), 'uptime', [
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'rrd_def' => RrdDefinition::make()->addDataset('uptime', 'GAUGE', 0),
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], $uptime);
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$os->enableGraph('uptime');
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echo 'Uptime: ' . Time::formatInterval($uptime) . PHP_EOL;
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$device->uptime = $uptime;
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}
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}
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protected static function discoveryIsSlow($def): bool
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{
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foreach ($def['discovery'] as $item) {
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if (array_key_exists('snmpget', $item) || array_key_exists('snmpwalk', $item)) {
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return true;
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}
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}
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return false;
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}
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}
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