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  1. <?php /* <ViaThinkSoftSignature>
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  23. w==
  24. </ViaThinkSoftSignature> */ ?>
  25. <?php
  26.  
  27. /*
  28.  * VNag - Nagios Framework for PHP
  29.  * Developed by Daniel Marschall, ViaThinkSoft <www.viathinksoft.com>
  30.  * Licensed under the terms of the Apache 2.0 license
  31.  *
  32.  * Revision 2021-12-13
  33.  */
  34.  
  35. declare(ticks=1);
  36.  
  37. class MinecraftJavaVersionCheck extends VNag {
  38.         protected $argSystemDir = null;
  39.  
  40.         public function __construct() {
  41.                 parent::__construct();
  42.  
  43.                 $this->registerExpectedStandardArguments('Vvht');
  44.  
  45.                 $this->getHelpManager()->setPluginName('check_minecraft_java_version');
  46.                 $this->getHelpManager()->setVersion('1.0');
  47.                 $this->getHelpManager()->setShortDescription('This plugin checks if a local Minecraft for Java server has the latest version installed.');
  48.                 $this->getHelpManager()->setCopyright('Copyright (C) 2011-$CURYEAR$ Daniel Marschall, ViaThinkSoft.');
  49.                 $this->getHelpManager()->setSyntax('$SCRIPTNAME$ [-d <directory>]');
  50.                 $this->getHelpManager()->setFootNotes('If you encounter bugs, please contact ViaThinkSoft at www.viathinksoft.com');
  51.  
  52.                 // Individual (non-standard) arguments:
  53.                 $this->addExpectedArgument($this->argSystemDir = new VNagArgument('d', 'directory', VNagArgument::VALUE_REQUIRED, 'serverPath', 'The local directory where your Minecraft for Java server.jar is located.'));
  54.         }
  55.  
  56.         protected function get_latest_minecraft_version() {
  57.                 $headers = array(
  58.                         // These headers are important! Otherwise the request will be blocked by AkamaiGhost
  59.                         "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36",
  60.                         "Accept-Language: de-DE,de;q=0.9,en-DE;q=0.8,en;q=0.7,en-US;q=0.6",
  61.                         "Accept-Encoding: none"
  62.                 );
  63.                 // curl 'https://www.minecraft.net/en-us/download/server' \
  64.                 //      -H 'user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36' \
  65.                 //      -H 'accept-language: de-DE,de;q=0.9,en-DE;q=0.8,en;q=0.7,en-US;q=0.6' \
  66.                 //      --compressed
  67.                 $ch = curl_init();
  68.                 curl_setopt($ch, CURLOPT_URL,"https://www.minecraft.net/en-us/download/server"); // TODO: make locale configurable?
  69.                 curl_setopt($ch, CURLOPT_POST, 0);
  70.                 curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  71.                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  72.                 $cont = curl_exec($ch);
  73.                 curl_close($ch);
  74.  
  75.                 if (!$cont) throw new Exception("Cannot detect latest available Minecraft version (HTTPS request failed)");
  76.  
  77.                 preg_match_all('@minecraft_server\\.(.+)\\.jar@U', $cont, $m);
  78.  
  79.                 if (!isset($m[1][0])) throw new Exception("Cannot detect latest available Minecraft version (regex pattern mismatch)");
  80.  
  81.                 return $m[1][0];
  82.         }
  83.  
  84.         protected function get_installed_minecraft_version($local_path) {
  85.                 if (substr($local_path,-4) == '.jar') {
  86.                         $files = glob($local_path);
  87.                 } else {
  88.                         $files = glob($local_path.'/server.jar');
  89.                 }
  90.  
  91.                 if (count($files) == 0) throw new Exception("No server.jar found at $local_path");
  92.                 if (count($files) > 1) throw new Exception("More than one server.jar found at $local_path");
  93.                 $server_jar = $files[0];
  94.  
  95.                 $cmd = "unzip -p ".escapeshellarg($server_jar)." version.json";
  96.  
  97.                 $out = array();
  98.                 $ec = -1;
  99.                 exec($cmd, $out, $ec);
  100.                 if ($ec != 0) throw new Exception("Cannot unzip version.json");
  101.  
  102.                 $json = implode("\n",$out);
  103.  
  104.                 return (string)json_decode($json,true)['name'];
  105.         }
  106.  
  107.         protected function cbRun($optional_args=array()) {
  108.                 $system_dir = $this->argSystemDir->getValue(); // note: can contain wildcards
  109.                 $cur_ver = $this->get_installed_minecraft_version($system_dir);
  110.  
  111.                 $new_ver = $this->get_latest_minecraft_version();
  112.  
  113.                 // TODO: also check/show if stable or not
  114.                 if ($cur_ver === $new_ver) {
  115.                         $this->setStatus(VNag::STATUS_OK);
  116.                         $this->setHeadline("Minecraft version $cur_ver is the latest available version for your Minecraft for Java server installation at $system_dir", true);
  117.                 } else {
  118.                         $this->setStatus(VNag::STATUS_WARNING);
  119.                         $this->setHeadline("Minecraft version $cur_ver is outdated. Newer version is $new_ver for installation at $system_dir", true);
  120.                 }
  121.         }
  122. }
  123.