#!/usr/bin/php
<?php
/*
 * Script      : check_temp_hum_th2e
 * Author(s)   : Pol Warnimont
 * Create date : 2015-05-26
 * Version     : 2.1
 *
 * Description : A plugin for receiving the temperature or humidity
 *               from TH2E sensor devices.
 *
 * Changelog
 * ---------
 *  2015-05-26 : Modified script for publishing.
 *  2015-05-29 : Fixed perfdata output.
 *
 * License information
 * -------------------
 *  Copyright (C) 2015  ASTRON Buildings S.A.
 *  
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

class Sensor {
	private function recvXML($ipaddr, $username, $password) {
		$context = stream_context_create(array(
			"http" => array(
				"header" => "Authorization: Basic " . base64_encode($username . ":" . $password)
			)
		));
		$data = file_get_contents("http://" . $ipaddr . "/fresh.xml", false, $context);

		return simplexml_load_string($data);
	}

	private function cmpResults($result, $min, $max) {
		$tmpRes = intval($result);
		$arrResult = array();

		if (($tmpRes < $max) && ($tmpRes < $min)) {
			$arrResult["prefix"] = "OK";
			$arrResult["excode"] = 0;
		}
		else if (($tmpRes < $max) && ($tmpRes >= $min)) {
			$arrResult["prefix"] = "WARN";
			$arrResult["excode"] = 1;
		}
		else if (($tmpRes >= $max) && ($tmpRes > $min)) {
			$arrResult["prefix"] = "CRIT";
			$arrResult["excode"] = 2;
		}
		else {
			$arrResult["prefix"] = "UNKW";
			$arrResult["excode"] = 3;
		}

		$arrResult["result"] = $result;

		return $arrResult;
	}

	public static function getSensorData($ipaddr, $username, $password, $min, $max, $tsensor) {
		$xml = self::recvXML($ipaddr, $username, $password);

		foreach ($xml->sns as $sensor) {
			if ($sensor->attributes()->id == $tsensor) {
				return self::cmpResults($sensor->attributes()->val, $min, $max);
			}
		}
	}
}

// SCRIPT ENTRY POINT

$shortopts = "u:p:i:s:m:M:";

$options = getopt($shortopts);

if (count($options) === 6) {
	$data = Sensor::getSensorData($options["i"], $options["u"], $options["p"], $options["m"], $options["M"], $options["s"]);
	
	switch ($options["s"]) {
		case 1:
			$strRet = "%s: Room temperature is %s °C | temperature=%s;%s;%s";
		break;

		case 2:
			$strRet = "%s: Room humidity is at %s%% | humidity=%s;%s;%s";
		break;
	}

	printf($strRet, $data["prefix"], $data["result"], $data["result"], $options["m"], $options["M"]);

	exit($data["excode"]);
}
else {
	printf("Syntax error!\nUsage: %s -arg1 -arg2 ...\n\n", $argv[0]);
	printf("The following parameters must be specified:\n -u <username>\n -p <password>\n -i <ip address>\n -s <1..2>\n    1 = Temperature\n    2 = Humidity\n -m <warning value>\n -M <critical value>\n\n");
	printf("Written by Warnimont Pol\nCopyright (C) 2015  ASTRON Buildings S.A.\nThe check_temp_hum_th2e script comes with ABSOLUTELY NO WARRANTY!\n");
	printf("Please visit https://github.com/pwarnimo/nagios_plugins for licensing informations.\n");

	exit(1);
}