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<?php

/*
  Copyright (c) 2007-2011, Till Brehm, projektfarm Gmbh and Oliver Vogel www.muv.com
  All rights reserved.

  Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
 * Neither the name of ISPConfig nor the names of its contributors
  may be used to endorse or promote products derived from this software without
  specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

class monitor_tools {

	//** Get distribution identifier
	//** IMPORTANT!
	//   This is the same code as in install/lib/install.lib.php
	//   So if you change it here, you also have to change it in there!
	//   Please do not forget to remove the swriteln(); - lines here at this file
	public function get_distname() {

		$distname = '';
		$distver = '';
		$distid = '';
		$distbaseid = '';

		//** Debian or Ubuntu
		if (file_exists('/etc/debian_version')) {
			if (strstr(trim(file_get_contents('/etc/issue')), 'Ubuntu')) {
				if (strstr(trim(file_get_contents('/etc/issue')), 'LTS')) {
					$lts=" LTS";
				} else {
					$lts="";
				}

				$issue=file_get_contents('/etc/issue');
				$distname = 'Ubuntu';
				$distid = 'debian40';
				$distbaseid = 'debian';
				$ver = explode(' ',$issue);
				$ver = array_filter($ver);
				$ver = next($ver);
				$mainver = explode('.',$ver);
				$mainver = array_filter($mainver);
				$mainver = current($mainver).'.'.next($mainver);
				switch ($mainver){
				case "12.10":
					$relname = "(Quantal Quetzal)";
				break;
				case "12.04":
					$relname = "(Precise Pangolin)";
				break;
				case "11.10":
					$relname = "(Oneiric Ocelot)";
				break;
				case "11.14":
					$relname = "(Natty Narwhal)";
				break;
				case "10.10":
					$relname = "(Maverick Meerkat)";
				break;
				case "10.04":
					$relname = "(Lucid Lynx)";
				break;
				case "9.10":
					$relname = "(Karmic Koala)";
				break;
				case "9.04":
					$relname = "(Jaunty Jackpole)";
				break;
				case "8.10":
				$relname = "(Intrepid Ibex)";
				break;
				case "8.04":
					$relname = "(Hardy Heron)";
				break;
				case "7.10":
					$relname = "(Gutsy Gibbon)";
				break;
				case "7.04":
					$relname = "(Feisty Fawn)";
				break;
				case "6.10":
					$relname = "(Edgy Eft)";
				break;
				case "6.06":
					$relname = "(Dapper Drake)";
				break;
				case "5.10":
					$relname = "(Breezy Badger)";
				break;
				case "5.04":
					$relname = "(Hoary Hedgehog)";
				break;
				case "4.10":
					$relname = "(Warty Warthog)";
				break;
				default:
					$relname = "UNKNOWN";
				}
				$distver = $ver.$lts." ".$relname;
				swriteln("Operating System: ".$distver."\n");
			} elseif(trim(file_get_contents('/etc/debian_version')) == '4.0') {
				$distname = 'Debian';
				$distver = '4.0';
				$distid = 'debian40';
				$distbaseid = 'debian';
			} elseif (strstr(trim(file_get_contents('/etc/debian_version')), '5.0')) {
				$distname = 'Debian';
				$distver = 'Lenny';
				$distid = 'debian40';
				$distbaseid = 'debian';
			} elseif (strstr(trim(file_get_contents('/etc/debian_version')), '6.0') || trim(file_get_contents('/etc/debian_version')) == 'squeeze/sid') {
				$distname = 'Debian';
				$distver = 'Squeeze/Sid';
				$distid = 'debian60';
				$distbaseid = 'debian';
			} else {
				$distname = 'Debian';
				$distver = 'Unknown';
				$distid = 'debian40';
				$distbaseid = 'debian';
			}
		}

		//** OpenSuSE
		elseif (file_exists('/etc/SuSE-release')) {
			if (stristr(file_get_contents('/etc/SuSE-release'), '11.0')) {
				$distname = 'openSUSE';
				$distver = '11.0';
				$distid = 'opensuse110';
				$distbaseid = 'opensuse';
			} elseif (stristr(file_get_contents('/etc/SuSE-release'), '11.1')) {
				$distname = 'openSUSE';
				$distver = '11.1';
				$distid = 'opensuse110';
				$distbaseid = 'opensuse';
			} elseif (stristr(file_get_contents('/etc/SuSE-release'), '11.2')) {
				$distname = 'openSUSE';
				$distver = '11.1';
				$distid = 'opensuse110';
				$distbaseid = 'opensuse';
			} else {
				$distname = 'openSUSE';
				$distver = 'Unknown';
				$distid = 'opensuse110';
				$distbaseid = 'opensuse';
			}
		}


		//** Redhat
		elseif (file_exists('/etc/redhat-release')) {

			$content = file_get_contents('/etc/redhat-release');

			if (stristr($content, 'Fedora release 9 (Sulphur)')) {
				$distname = 'Fedora';
				$distver = '9';
				$distid = 'fedora9';
				$distbaseid = 'fedora';
			} elseif (stristr($content, 'Fedora release 10 (Cambridge)')) {
				$distname = 'Fedora';
				$distver = '10';
				$distid = 'fedora9';
				$distbaseid = 'fedora';
			} elseif (stristr($content, 'Fedora release 10')) {
				$distname = 'Fedora';
				$distver = '11';
				$distid = 'fedora9';
				$distbaseid = 'fedora';
			} elseif (stristr($content, 'CentOS release 5.2 (Final)')) {
				$distname = 'CentOS';
				$distver = '5.2';
				$distid = 'centos52';
				$distbaseid = 'fedora';
			} elseif (stristr($content, 'CentOS release 5.3 (Final)')) {
				$distname = 'CentOS';
				$distver = '5.3';
				$distid = 'centos53';
				$distbaseid = 'fedora';
			} else {
				$distname = 'Redhat';
				$distver = 'Unknown';
				$distid = 'fedora9';
				$distbaseid = 'fedora';
			}
		}

		//** Gentoo
		elseif (file_exists('/etc/gentoo-release')) {

			$content = file_get_contents('/etc/gentoo-release');

			preg_match_all('/([0-9]{1,2})/', $content, $version);
			$distname = 'Gentoo';
			$distver = $version[0][0] . $version[0][1];
			$distid = 'gentoo';
			$distbaseid = 'gentoo';
		} else {
			die('Unrecognized GNU/Linux distribution');
		}

		return array('name' => $distname, 'version' => $distver, 'id' => $distid, 'baseid' => $distbaseid);
	}

    //** Email Quota
    public function monitorEmailQuota() {

		//* Initialize data array
		$data = array();

		//* the id of the server as int
		$server_id = intval($conf['server_id']);

		//* The type of the data
		$type = 'email_quota';

		//* The state of the email_quota.
		$state = 'ok';
		$mailboxes = $app->db->queryAllRecords("SELECT email,maildir FROM mail_user WHERE server_id = $server_id");
		if(is_array($mailboxes)) {
			foreach($mailboxes as $mb) {
				$email = $mb['email'];
				$email_parts = explode('@',$mb['email']);
				$filename = $mb['maildir'].'/.quotausage';
				if(file_exists($filename) && !is_link($filename)) {
					$quotafile = file($filename);
					$data[$email]['used'] = trim($quotafile['1']);
					unset($quotafile);
					exec('du -s '.escapeshellcmd($mb['maildir']),$out);
					$parts = explode(' ',$out[0]);
					$data[$email]['used'] = intval($parts[0])*1024;
					unset($out);
					unset($parts);
				}

        //* Dovecot quota check Courier in progress lathama@gmail.com
        if($dir = opendir("/var/vmail")){
            while (($quotafiles = readdir($dir)) !== false){
                if(preg_match('/.\_quota$/', $quotafiles)){
                    $quotafile = (file("/var/vmail/" . $quotafiles));
                    $emailaddress = preg_replace('/_quota/',"", $quotafiles);
                    $emailaddress = preg_replace('/_/',"@", $emailaddress);
                    $data[$emailaddress]['used'] = trim($quotafile['1']);
                }
            }
            closedir($dir);
        }
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
        return $res;
    }

    //** Filesystem Quota
	public function monitorHDQuota() {
		global $conf;

		//* Initialize data array
		//* the id of the server as int
		$server_id = intval($conf['server_id']);

		//* The type of the data
		//* The state of the harddisk_quota.
		//* Fetch the data for all users
		//* Split into array
		//* ignore the first 5 lines, process the rest
		for ($i = 5; $i <= sizeof($df); $i++) {
			if ($df[$i] != '') {
				//* Make a array of the data
				$s = preg_split('/[\s]+/', $df[$i]);
				$username = $s[0];
				if (substr($username, 0, 3) == 'web') {
					if (isset($data['user'][$username])) {
						$data['user'][$username]['used'] += $s[2];
						$data['user'][$username]['soft'] += $s[3];
						$data['user'][$username]['hard'] += $s[4];
						$data['user'][$username]['files'] += $s[5];
					} else {
						$data['user'][$username]['used'] = $s[2];
						$data['user'][$username]['soft'] = $s[3];
						$data['user'][$username]['hard'] = $s[4];
						$data['user'][$username]['files'] = $s[5];
		//** Fetch the data for all users
		//* split into array
		//* ignore the first 5 lines, process the rest
		for ($i = 5; $i <= sizeof($df); $i++) {
			if ($df[$i] != '') {
				//* Make a array of the data
				$s = preg_split('/[\s]+/', $df[$i]);
				$groupname = $s[0];
				if (substr($groupname, 0, 6) == 'client') {
					if (isset($data['group'][$groupname])) {
						$data['group'][$groupname]['used'] += $s[1];
						$data['group'][$groupname]['soft'] += $s[2];
						$data['group'][$groupname]['hard'] += $s[3];
					} else {
						$data['group'][$groupname]['used'] = $s[1];
						$data['group'][$groupname]['soft'] = $s[2];
						$data['group'][$groupname]['hard'] = $s[3];
					}
				}
			}
		}

		//* Return the Result
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorServer() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'server_load';

		/*
		  Fetch the data into a array
		 */
		$procUptime = shell_exec("cat /proc/uptime | cut -f1 -d' '");
		$data['up_days'] = floor($procUptime / 86400);
		$data['up_hours'] = floor(($procUptime - $data['up_days'] * 86400) / 3600);
		$data['up_minutes'] = floor(($procUptime - $data['up_days'] * 86400 - $data['up_hours'] * 3600) / 60);

		$data['uptime'] = shell_exec('uptime');

		$tmp = explode(',', $data['uptime'], 4);
		$tmpUser = explode(' ', trim($tmp[2]));
		$data['user_online'] = intval($tmpUser[0]);

		//* New Load Average code to fix "always zero" bug in non-english distros. NEEDS TESTING
		$loadTmp = shell_exec("cat /proc/loadavg | cut -f1-3 -d' '");
		$load = explode(' ', $loadTmp);
		$data['load_1'] = floatval(str_replace(',', '.', $load[0]));
		$data['load_5'] = floatval(str_replace(',', '.', $load[1]));
		$data['load_15'] = floatval(str_replace(',', '.', $load[2]));

		/** The state of the server-load. */
		$state = 'ok';
		if ($data['load_1'] > 20)
			$state = 'info';
		if ($data['load_1'] > 50)
			$state = 'warning';
		if ($data['load_1'] > 100)
			$state = 'critical';
		if ($data['load_1'] > 150)
			$state = 'error';

		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorOsVer() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'os_info';

		/*
		  Fetch the data into a array
		 */
		$dist = $this->get_distname();

		$data['name'] = $dist['name'];
		$data['version'] = $dist['version'];

		/* the OS has no state. It is, what it is */
		$state = 'no_state';

		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorIspcVer() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'ispc_info';

		/*
		  Fetch the data into a array
		 */
		$data['name'] = ISPC_APP_TITLE;
		$data['version'] = ISPC_APP_VERSION;

		/* the ISPC-Version has no state. It is, what it is */
		$state = 'no_state';
		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorDiskUsage() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'disk_usage';

		/** The state of the disk-usage */
		$state = 'ok';

		/** Fetch the data of ALL devices into a array (needed for monitoring!) */
		$dfData = shell_exec('df -hT');

		// split into array
		$df = explode("\n", $dfData);

		/*
		 * ignore the first line, process the rest
		 */
		for ($i = 1; $i <= sizeof($df); $i++) {
			if ($df[$i] != '') {
				/*
				 * Make an array of the data
				 */
				$s = preg_split('/[\s]+/', $df[$i]);
				$data[$i]['fs'] = $s[0];
				$data[$i]['type'] = $s[1];
				$data[$i]['size'] = $s[2];
				$data[$i]['used'] = $s[3];
				$data[$i]['available'] = $s[4];
				$data[$i]['percent'] = $s[5];
				$data[$i]['mounted'] = $s[6];
				/*
				 * calculate the state
				 */
				$usePercent = floatval($data[$i]['percent']);
				
				//* get the free memsize
				if(substr($data[$i]['available'],-1) == 'G') {
					$freesize = floatval($data[$i]['available'])*1024;
				} elseif(substr($data[$i]['available'],-1) == 'T') {
					$freesize = floatval($data[$i]['available'])*1024*1024;
				} else {
					$freesize = floatval($data[$i]['available']);
				}

				//* We don't want to check some filesystem which have no sensible filling levels
				switch ($data[$i]['type']) {
					case 'iso9660':
					case 'cramfs':
					case 'udf':
					case 'tmpfs':
					case 'devtmpfs':
					case 'udev':
						break;
					default:
						if ($usePercent > 75 && $freesize < 2000)
							$state = $this->_setState($state, 'info');
						if ($usePercent > 80 && $freesize < 1000)
							$state = $this->_setState($state, 'warning');
						if ($usePercent > 90 && $freesize < 500)
							$state = $this->_setState($state, 'critical');
						if ($usePercent > 95 && $freesize < 100)
							$state = $this->_setState($state, 'error');
						break;
				}
			}
		}

		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorMemUsage() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'mem_usage';

		/*
		  Fetch the data into a array
		 */
		$miData = shell_exec('cat /proc/meminfo');

		$memInfo = explode("\n", $miData);

		foreach ($memInfo as $line) {
			$part = preg_split('/:/', $line);
			$key = trim($part[0]);
			$tmp = explode(' ', trim($part[1]));
			$value = 0;
			if ($tmp[1] == 'kB')
				$value = $tmp[0] * 1024;
			$data[$key] = $value;
		}

		/*
		 * actually this info has no state.
		 * maybe someone knows better...???...
		 */
		$state = 'no_state';
		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorCpu() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'cpu_info';

		/*
		  Fetch the data into a array
		 */
		if (file_exists('/proc/cpuinfo')) {
			$cpuData = shell_exec('cat /proc/cpuinfo');
			$cpuInfo = explode("\n", $cpuData);
			$processor = 0;

			foreach ($cpuInfo as $line) {

				$part = preg_split('/:/', $line);
				$key = trim($part[0]);
				$value = trim($part[1]);
				if ($key == 'processor')
					$processor = intval($value);
				if ($key != '')
					$data[$key . ' ' . $processor] = $value;
			}

			/* the cpu has no state. It is, what it is */
			$state = 'no_state';
		} else {
			/*
			 * It is not Linux, so there is no data and no state
			 *
			 * no_state, NOT unknown, because "unknown" is shown as state
			 * inside the GUI. no_state is hidden.
			 *
			 * We have to write NO DATA inside the DB, because the GUI
			 * could not know, if there is any dat, or not...
			 */
			$state = 'no_state';
			$data['output'] = '';
		}

		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorServices() {
		global $app;
		global $conf;

		/** the id of the server as int */
		$server_id = intval($conf['server_id']);

		/**  get the "active" Services of the server from the DB */
		$services = $app->db->queryOneRecord('SELECT * FROM server WHERE server_id = ' . $server_id);
		/*
		 * If the DB is down, we have to set the db to "yes".
		 * If we don't do this, then the monitor will NOT monitor, that the db is down and so the
		 * rescue-module can not try to rescue the db
		 */
		if ($services == null) {
			$services['db_server'] = 1;
		}

		/* The type of the Monitor-data */
		$type = 'services';

		/** the State of the monitoring */
		/* ok, if ALL active services are running,
		 * error, if not
		 * There is no other state!
		 */
		$state = 'ok';

		/* Monitor Webserver */
		$data['webserver'] = -1; // unknown - not needed
		if ($services['web_server'] == 1) {
			if ($this->_checkTcp('localhost', 80)) {
				$data['webserver'] = 1;
			} else {
				$data['webserver'] = 0;
				$state = 'error'; // because service is down
			}
		}

		/* Monitor FTP-Server */
		$data['ftpserver'] = -1; // unknown - not needed
		if ($services['file_server'] == 1) {
			if ($this->_checkFtp('localhost', 21)) {
				$data['ftpserver'] = 1;
			} else {
				$data['ftpserver'] = 0;
				$state = 'error'; // because service is down
			}
		}

		/* Monitor SMTP-Server */
		$data['smtpserver'] = -1; // unknown - not needed
		if ($services['mail_server'] == 1) {
			if ($this->_checkTcp('localhost', 25)) {
				$data['smtpserver'] = 1;
			} else {
				$data['smtpserver'] = 0;
				$state = 'error'; // because service is down
			}
		}

		/* Monitor POP3-Server */
		$data['pop3server'] = -1; // unknown - not needed
		if ($services['mail_server'] == 1) {
			if ($this->_checkTcp('localhost', 110)) {
				$data['pop3server'] = 1;
			} else {
				$data['pop3server'] = 0;
				$state = 'error'; // because service is down
			}
		}

		/* Monitor IMAP-Server */
		$data['imapserver'] = -1; // unknown - not needed
		if ($services['mail_server'] == 1) {
			if ($this->_checkTcp('localhost', 143)) {
				$data['imapserver'] = 1;
			} else {
				$data['imapserver'] = 0;
				$state = 'error'; // because service is down
			}
		}

		/* Monitor BIND-Server */
		$data['bindserver'] = -1; // unknown - not needed
		if ($services['dns_server'] == 1) {
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			if ($this->_checkUdp('localhost', 53)) {
				$data['bindserver'] = 1;
			} else {
				$data['bindserver'] = 0;
				$state = 'error'; // because service is down
			}
		}

		/* Monitor MySQL Server */
		$data['mysqlserver'] = -1; // unknown - not needed
		if ($services['db_server'] == 1) {
			if ($this->_checkTcp('localhost', 3306)) {
				$data['mysqlserver'] = 1;
			} else {
				$data['mysqlserver'] = 0;
				$state = 'error'; // because service is down
			}
		}
		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorOpenVzHost() {
		global $app;
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'openvz_veinfo';

		/*
		  Fetch the data into a array
		 */
		$app->load(openvz_tools);
		$openVzTools = new openvz_tools();
		$data = $openVzTools->getOpenVzVeInfo();

		/* the VE-Info has no state. It is, what it is */
		$state = 'no_state';

		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorOpenVzUserBeancounter() {
		global $app;
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'openvz_beancounter';

		/*
		  Fetch the data into a array
		 */
		$app->load(openvz_tools);
		$openVzTools = new openvz_tools();
		$data = $openVzTools->getOpenVzVeBeanCounter();

		/* calculate the state of the beancounter */
		if ($data == '') {
			$state = 'no_state';
		} else {
			$state = 'ok';

			/* transfer this output-string into a array */
			$test = explode("\n", $data);

			/* the first list of the output is not needed */
			array_shift($test);

			/* now process all items of the rest */
			foreach ($test as $item) {
				/*
				 * eliminate all doubled spaces and spaces at the beginning and end
				 */
				while (strpos($item, '  ') !== false) {
					$item = str_replace('  ', ' ', $item);
				}
				$item = trim($item);

				/*
				 * The failcounter is the LAST
				 */
				if ($item != '') {
					$tmp = explode(' ', $item);
					$failCounter = $tmp[sizeof($tmp) - 1];
					if ($failCounter > 0)
						$state = 'info';
					if ($failCounter > 50)
						$state = 'warning';
					if ($failCounter > 200)
						$state = 'critical';
					if ($failCounter > 10000)
						$state = 'error';
				}
			}
		}

		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorSystemUpdate() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'system_update';

		/* This monitoring is only available on Debian or Ubuntu */
		if (file_exists('/etc/debian_version')) {

			/*
			 * first update the "apt database"
			 */
			shell_exec('apt-get update');

			/*
			 * Then test the upgrade.
			 * if there is any output, then there is a needed update
			 */
			$aptData = shell_exec('apt-get -s -qq dist-upgrade');
			if ($aptData == '') {
				/* There is nothing to update! */
				$state = 'ok';
			} else {
				/*
				 * There is something to update! this is in most cases not critical, so we can
				 * do a system-update once a month or so...
				 */
				$state = 'info';
			}

			/*
			 * Fetch the output
			 */
			$data['output'] = shell_exec('apt-get -s -q dist-upgrade');
		} elseif (file_exists('/etc/gentoo-release')) {

			/*
			 * first update the portage tree
			 */

			// In keeping with gentoo's rsync policy, don't update to frequently (every four hours - taken from http://www.gentoo.org/doc/en/source_mirrors.xml)
			$do_update = true;
			if (file_exists('/usr/portage/metadata/timestamp.chk')) {
				$datetime = file_get_contents('/usr/portage/metadata/timestamp.chk');
				$datetime = trim($datetime);

				$dstamp = strtotime($datetime);
				if ($dstamp) {
					$checkat = $dstamp + 14400; // + 4hours
					if (mktime() < $checkat) {
						$do_update = false;
					}
				}
			}

			if ($do_update) {
				shell_exec('emerge --sync --quiet');
			}

			/*
			 * Then test the upgrade.
			 * if there is any output, then there is a needed update
			 */
			$emergeData = shell_exec('glsa-check -t affected');
			if ($emergeData == '') {
				/* There is nothing to update! */
				$state = 'ok';
				$data['output'] = 'No unapplied GLSA\'s found on the system.';
			} else {
				/* There is something to update! */
				$state = 'info';
				$data['output'] = shell_exec('glsa-check -pv --nocolor affected 2>/dev/null');
			}
		} elseif (file_exists('/etc/SuSE-release')) {

			/*
			 * update and find the upgrade.
			 * if there is any output, then there is a needed update
			 */
			$aptData = shell_exec('zypper -q lu');
			if ($aptData == '') {
				/* There is nothing to update! */
				$state = 'ok';
			} else {
				/*
				 * There is something to update! this is in most cases not critical, so we can
				 * do a system-update once a month or so...
				 */
				$state = 'info';
			}

			/*
			 * Fetch the output
			 */
			$data['output'] = shell_exec('zypper lu');
		} else {
			/*
			 * It is not Debian/Ubuntu, so there is no data and no state
			 *
			 * no_state, NOT unknown, because "unknown" is shown as state
			 * inside the GUI. no_state is hidden.
			 *
			 * We have to write NO DATA inside the DB, because the GUI
			 * could not know, if there is any dat, or not...
			 */
			$state = 'no_state';
			$data['output'] = '';
		}

		/*
		 * Return the Result
		 */
		$res['server_id'] = $server_id;
		$res['type'] = $type;
		$res['data'] = $data;
		$res['state'] = $state;
		return $res;
	}

	public function monitorMailQueue() {
		global $conf;

		/* the id of the server as int */
		$server_id = intval($conf['server_id']);

		/** The type of the data */
		$type = 'mailq';

		/* Get the data from the mailq */
		$data['output'] = shell_exec('mailq');

		/*
		 *  The last line has more informations
		 */
		$tmp = explode("\n", $data['output']);
		$more = $tmp[sizeof($tmp) - 1];
		$res = $this->_getIntArray($more);