120 lines
2.9 KiB
PHP
120 lines
2.9 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_TimeSync
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Sntp.php 16209 2009-06-21 19:20:34Z thomas $
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*/
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/**
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* Zend_TimeSync_Protocol
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*/
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require_once 'Zend/TimeSync/Protocol.php';
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/**
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* SNTP Protocol handling class
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*
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* @category Zend
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* @package Zend_TimeSync
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_TimeSync_Sntp extends Zend_TimeSync_Protocol
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{
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/**
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* Port number for this timeserver
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*
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* @var integer
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*/
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protected $_port = 37;
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/**
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* Socket delay
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*
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* @var integer
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*/
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private $_delay;
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/**
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* Class constructor, sets the timeserver and port number
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*
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* @param string $timeserver Timeserver to connect to
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* @param integer $port Port of the timeserver when it differs from the default port
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*/
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public function __construct($timeserver, $port)
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{
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$this->_timeserver = 'udp://' . $timeserver;
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if ($port !== null) {
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$this->_port = $port;
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}
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}
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/**
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* Prepares the data that will be send to the timeserver
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*
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* @return array
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*/
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protected function _prepare()
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{
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return "\n";
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}
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/**
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* Reads the data returned from the timeserver
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*
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* @return string
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*/
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protected function _read()
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{
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$result = fread($this->_socket, 49);
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$this->_delay = (($this->_delay - time()) / 2);
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return $result;
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}
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/**
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* Writes data to to the timeserver
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*
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* @param string $data Data to write to the timeserver
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* @return void
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*/
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protected function _write($data)
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{
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$this->_connect();
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$this->_delay = time();
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fputs($this->_socket, $data);
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}
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/**
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* Extracts the data returned from the timeserver
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*
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* @param string $result Data to extract
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* @return integer
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*/
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protected function _extract($result)
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{
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$dec = hexdec('7fffffff');
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$time = abs(($dec - hexdec(bin2hex($result))) - $dec);
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$time -= 2208988800;
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// Socket delay
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$time -= $this->_delay;
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$this->_info['offset'] = $this->_delay;
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return $time;
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}
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}
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