Subversion Repositories vnag

<?php

/*

 * VNag - Nagios Framework for PHP

 * Developed by Daniel Marschall, ViaThinkSoft <www.viathinksoft.com>

 * Licensed under the terms of the Apache 2.0 license

 *

 * Revision 2023-10-13

 */

declare(ticks=1);

define('OUTPUT_UOM', 'GB');

define('ROUND_TO', 0);

class VirtualMemCheck extends VNag {

        public function __construct() {

                parent::__construct();

                $this->registerExpectedStandardArguments('Vhtwc');

                $this->getHelpManager()->setPluginName('check_virtual_mem');

                $this->getHelpManager()->setVersion('2023-10-13');

                $this->getHelpManager()->setShortDescription('This plugin checks the amount of free virtual memory (real memory + swap combined).');

                $this->getHelpManager()->setCopyright('Copyright (C) 2011-$CURYEAR$ Daniel Marschall, ViaThinkSoft.');

                $this->getHelpManager()->setSyntax('$SCRIPTNAME$ [-w freeMemKB|%] [-c freeMemKB|%]');

                $this->getHelpManager()->setFootNotes('If you encounter bugs, please contact ViaThinkSoft at www.viathinksoft.com');

                // In this context, when the user writes "-w 10GB" then they probably mean "-w @10GB". Make sure that the user doesn't do it wrong

                $this->warningSingleValueRangeBehaviors[0]  = self::SINGLEVALUE_RANGE_VAL_LT_X_BAD;

                $this->criticalSingleValueRangeBehaviors[0] = self::SINGLEVALUE_RANGE_VAL_LT_X_BAD;

        }

        protected function cbRun($optional_args=array()) {

                if (!file_exists($meminfo_file = '/proc/meminfo')) {

                        throw new VNagException("Cannot find $meminfo_file");

                }

                $meminfo_attrs = array();

                foreach (file($meminfo_file) as $line) {

                        $line = trim($line);

                        if ($line == '') continue;

                        list($key, $value) = explode(':', $line, 2);

                        if ((!strstr($key,'Pages')) && (strtolower(substr($line,-2)) !== 'kb')) {

                                throw new VNagException("meminfo shall contain Kilobytes!");

                        }

                        $meminfo_attrs[$key] = (int)trim(substr($value, 0, strlen($value)-2));

                }

                if (!isset($meminfo_attrs['MemAvailable'])) {

                        $meminfo_attrs['MemAvailable'] = $meminfo_attrs['MemFree'];

                        if (isset($meminfo_attrs['Buffers'])) $meminfo_attrs['MemAvailable'] += $meminfo_attrs['Buffers'];

                        if (isset($meminfo_attrs['Cached']))  $meminfo_attrs['MemAvailable'] += $meminfo_attrs['Cached'];

                }

                $totalKB = $meminfo_attrs['MemTotal']      + $meminfo_attrs['SwapTotal'];

                $freeKB  = $meminfo_attrs['MemAvailable']  + $meminfo_attrs['SwapFree'];

                $freePercent = $freeKB/$totalKB*100;

                $this->checkAgainstWarningRange( array($freeKB.'KB', $freePercent.'%'), false, true, 0);

                $this->checkAgainstCriticalRange(array($freeKB.'KB', $freePercent.'%'), false, true, 0);

                $m = (new VNagValueUomPair($freeKB.'KB'));

                $m->roundTo = ROUND_TO;

                $freeKB = $m->normalize(OUTPUT_UOM);

                $m = (new VNagValueUomPair($totalKB.'KB'));

                $m->roundTo = ROUND_TO;

                $totalKB = $m->normalize(OUTPUT_UOM);

                $msg = "$freeKB free of $totalKB (".round($freePercent,ROUND_TO)."% free)";

                $this->setHeadline($msg);

        }

}