I couldn't find a "utils.php" script for making it easier to write nagios plugins in PHP so I thought I'd whip one up. This is a combination of the utils.php from CVS I found laying around the web and a port of Nagios::Plugin::Range perl module. It seems to pass all the tests that I found for the nagios plugins range documentation.
<?php /* * Created on Sep 14, (c) 2006 by Marcel K�hn * GPL licensed, marcel@kuehns.org * * Ported nagios range checking from Nagios::Plugin::Range * by Doug Warner <doug@warner.fm> */ #Configuration define('STATE_OK',0); define('STATE_WARNING',1); define('STATE_CRITICAL',2); define('STATE_UNKNOWN',3); define('STATE_DEPENDENT',4); define('SNMPWALK','/usr/bin/snmpwalk'); function detectOS(){ $arr = posix_uname(); return strtolower($arr["sysname"]); } function verifyOS($supportedOSarray){ $runningOS = detectOS(); if(in_array($runningOS,$supportedOSarray)){ return TRUE; } else{ return FALSE; } } function machineName(){ $arr = posix_uname(); return strtolower($arr["nodename"]); } class Nagios_Plugin_Range { const INSIDE = 1; const OUTSIDE = 0; protected $range; protected $start = 0; protected $end = 0; protected $start_infinity = false; protected $end_infinity = false; protected $alert_on; public function __construct($range) { $this->range = $range; $this->parse_range_string($range); } public function valid() { return isset($this->alert_on); } public function check_range($value) { $false = false; $true = true; if ($this->alert_on == self::INSIDE) { $false = true; $true = false; } /* DEBUG echo " R:$this->range; V:$value; S:$this->start, E:$this->end, ". "SI: " . ( $this->start_infinity ? 'T' : 'F') . ', ' . "EI: " . ( $this->end_infinity ? 'T' : 'F') . ', ' . "InOut: " . ( $this->alert_on == self::INSIDE ? 'I' : 'O') . '; ' . "\n"; */ if (!$this->end_infinity && !$this->start_infinity ) { if ($this->start <= $value && $value <= $this->end) { return $false; } else { return $true; } } elseif (!$this->start_infinity && $this->end_infinity) { if ( $value >= $this->start ) { return $false; } else { return $true; } } elseif ($this->start_infinity && !$this->end_infinity) { if ($value <= $this->end) { return $false; } else { return $true; } } else { return $false; } } # Returns a N::P::Range object if the string is a conforms to a Nagios Plugin range string, otherwise null protected function parse_range_string($string) { $valid = 0; $alert_on = self::OUTSIDE; $string = preg_replace('/\s/', '', $string); $value = "[-+]?[\d\.]+"; $value_re = "${value}(?:e${value})?"; # check for valid range definition if ( !preg_match('/[\d~]/', $string) || !preg_match("/^\@?(${value_re}|~)?(:(${value_re})?)?$/", $string)) { echo "invalid range definition '$string'"; exit(STATE_UNKNOWN); } if (preg_match('/^\@/', $string)) { $string = preg_replace('/^\@/', '', $string); $alert_on = self::INSIDE; } # '~:x' if (preg_match('/^~/', $string)) { $string = preg_replace('/^~/', '', $string); $this->start_infinity = true; } # '10:' if (preg_match("/^(${value_re})?:/", $string, $matches)) { if (!empty($matches[1])) { $this->set_range_start($matches[1]); } $this->end_infinity = true; # overridden below if there's an end specified $string = preg_replace("/^(${value_re})?:/", '', $string); $valid++; } # 'x:10' or '10' if (preg_match("/^(${value_re})$/", $string)) { $this->set_range_end($string); $valid++; } if ($valid && ($this->start_infinity || $this->end_infinity || $this->start <= $this->end)) { $this->alert_on = $alert_on; } } protected function set_range_start($value) { $this->start = (integer) $value; if (empty($this->start)) { $this->start = 0; } $this->start_infinity = false; } protected function set_range_end($value) { $this->end = (integer) $value; if (empty($this->end)) { $this->end = 0; } $this->end_infinity = false; } }