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+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category Zend
+ * @package Zend_TimeSync
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ * @version $Id$
+ */
+
+/**
+ * Zend_TimeSync_Protocol
+ */
+
+/**
+ * NTP Protocol handling class
+ *
+ * @category Zend
+ * @package Zend_TimeSync
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ */
+class Zend_TimeSync_Ntp extends Zend_TimeSync_Protocol
+{
+ /**
+ * NTP port number (123) assigned by the Internet Assigned Numbers Authority
+ *
+ * @var integer
+ */
+ protected $_port = 123;
+
+ /**
+ * NTP class constructor, sets the timeserver and port number
+ *
+ * @param string $timeserver Adress of the timeserver to connect to
+ * @param integer $port (Optional) Port for this timeserver
+ */
+ public function __construct($timeserver, $port = 123)
+ {
+ $this->_timeserver = 'udp://' . $timeserver;
+ if ($port !== null) {
+ $this->_port = $port;
+ }
+ }
+
+ /**
+ * Prepare local timestamp for transmission in our request packet
+ *
+ * NTP timestamps are represented as a 64-bit fixed-point number, in
+ * seconds relative to 0000 UT on 1 January 1900. The integer part is
+ * in the first 32 bits and the fraction part in the last 32 bits
+ *
+ * @return string
+ */
+ protected function _prepare()
+ {
+ $frac = microtime();
+ $fracba = ($frac & 0xff000000) >> 24;
+ $fracbb = ($frac & 0x00ff0000) >> 16;
+ $fracbc = ($frac & 0x0000ff00) >> 8;
+ $fracbd = ($frac & 0x000000ff);
+
+ $sec = (time() + 2208988800);
+ $secba = ($sec & 0xff000000) >> 24;
+ $secbb = ($sec & 0x00ff0000) >> 16;
+ $secbc = ($sec & 0x0000ff00) >> 8;
+ $secbd = ($sec & 0x000000ff);
+
+ // Flags
+ $nul = chr(0x00);
+ $nulbyte = $nul . $nul . $nul . $nul;
+ $ntppacket = chr(0xd9) . $nul . chr(0x0a) . chr(0xfa);
+
+ /*
+ * Root delay
+ *
+ * Indicates the total roundtrip delay to the primary reference
+ * source at the root of the synchronization subnet, in seconds
+ */
+ $ntppacket .= $nul . $nul . chr(0x1c) . chr(0x9b);
+
+ /*
+ * Clock Dispersion
+ *
+ * Indicates the maximum error relative to the primary reference source at the
+ * root of the synchronization subnet, in seconds
+ */
+ $ntppacket .= $nul . chr(0x08) . chr(0xd7) . chr(0xff);
+
+ /*
+ * ReferenceClockID
+ *
+ * Identifying the particular reference clock
+ */
+ $ntppacket .= $nulbyte;
+
+ /*
+ * The local time, in timestamp format, at the peer when its latest NTP message
+ * was sent. Contanis an integer and a fractional part
+ */
+ $ntppacket .= chr($secba) . chr($secbb) . chr($secbc) . chr($secbd);
+ $ntppacket .= chr($fracba) . chr($fracbb) . chr($fracbc) . chr($fracbd);
+
+ /*
+ * The local time, in timestamp format, at the peer. Contains an integer
+ * and a fractional part.
+ */
+ $ntppacket .= $nulbyte;
+ $ntppacket .= $nulbyte;
+
+ /*
+ * This is the local time, in timestamp format, when the latest NTP message from
+ * the peer arrived. Contanis an integer and a fractional part.
+ */
+ $ntppacket .= $nulbyte;
+ $ntppacket .= $nulbyte;
+
+ /*
+ * The local time, in timestamp format, at which the
+ * NTP message departed the sender. Contanis an integer
+ * and a fractional part.
+ */
+ $ntppacket .= chr($secba) . chr($secbb) . chr($secbc) . chr($secbd);
+ $ntppacket .= chr($fracba) . chr($fracbb) . chr($fracbc) . chr($fracbd);
+
+ return $ntppacket;
+ }
+
+ /**
+ * Calculates a 32bit integer
+ *
+ * @param string $input
+ * @return integer
+ */
+ protected function _getInteger($input)
+ {
+ $f1 = str_pad(ord($input[0]), 2, '0', STR_PAD_LEFT);
+ $f1 .= str_pad(ord($input[1]), 2, '0', STR_PAD_LEFT);
+ $f1 .= str_pad(ord($input[2]), 2, '0', STR_PAD_LEFT);
+ $f1 .= str_pad(ord($input[3]), 2, '0', STR_PAD_LEFT);
+ return (int) $f1;
+ }
+
+ /**
+ * Calculates a 32bit signed fixed point number
+ *
+ * @param string $input
+ * @return float
+ */
+ protected function _getFloat($input)
+ {
+ $f1 = str_pad(ord($input[0]), 2, '0', STR_PAD_LEFT);
+ $f1 .= str_pad(ord($input[1]), 2, '0', STR_PAD_LEFT);
+ $f1 .= str_pad(ord($input[2]), 2, '0', STR_PAD_LEFT);
+ $f1 .= str_pad(ord($input[3]), 2, '0', STR_PAD_LEFT);
+ $f2 = $f1 >> 17;
+ $f3 = ($f1 & 0x0001FFFF);
+ $f1 = $f2 . '.' . $f3;
+ return (float) $f1;
+ }
+
+ /**
+ * Calculates a 64bit timestamp
+ *
+ * @param string $input
+ * @return float
+ */
+ protected function _getTimestamp($input)
+ {
+ $f1 = (ord($input[0]) * pow(256, 3));
+ $f1 += (ord($input[1]) * pow(256, 2));
+ $f1 += (ord($input[2]) * pow(256, 1));
+ $f1 += (ord($input[3]));
+ $f1 -= 2208988800;
+
+ $f2 = (ord($input[4]) * pow(256, 3));
+ $f2 += (ord($input[5]) * pow(256, 2));
+ $f2 += (ord($input[6]) * pow(256, 1));
+ $f2 += (ord($input[7]));
+
+ return (float) ($f1 . "." . $f2);
+ }
+
+ /**
+ * Reads the data returned from the timeserver
+ *
+ * This will return an array with binary data listing:
+ *
+ * @return array
+ * @throws Zend_TimeSync_Exception When timeserver can not be connected
+ */
+ protected function _read()
+ {
+ $flags = ord(fread($this->_socket, 1));
+ $info = stream_get_meta_data($this->_socket);
+
+ if ($info['timed_out'] === true) {
+ fclose($this->_socket);
+ throw new Zend_TimeSync_Exception('could not connect to ' .
+ "'$this->_timeserver' on port '$this->_port', reason: 'server timed out'");
+ }
+
+ $result = array(
+ 'flags' => $flags,
+ 'stratum' => ord(fread($this->_socket, 1)),
+ 'poll' => ord(fread($this->_socket, 1)),
+ 'precision' => ord(fread($this->_socket, 1)),
+ 'rootdelay' => $this->_getFloat(fread($this->_socket, 4)),
+ 'rootdispersion' => $this->_getFloat(fread($this->_socket, 4)),
+ 'referenceid' => fread($this->_socket, 4),
+ 'referencestamp' => $this->_getTimestamp(fread($this->_socket, 8)),
+ 'originatestamp' => $this->_getTimestamp(fread($this->_socket, 8)),
+ 'receivestamp' => $this->_getTimestamp(fread($this->_socket, 8)),
+ 'transmitstamp' => $this->_getTimestamp(fread($this->_socket, 8)),
+ 'clientreceived' => microtime(true)
+ );
+
+ $this->_disconnect();
+ return $result;
+ }
+
+ /**
+ * Sends the NTP packet to the server
+ *
+ * @param string $data Data to send to the timeserver
+ * @return void
+ */
+ protected function _write($data)
+ {
+ $this->_connect();
+
+ fwrite($this->_socket, $data);
+ stream_set_timeout($this->_socket, Zend_TimeSync::$options['timeout']);
+ }
+
+ /**
+ * Extracts the binary data returned from the timeserver
+ *
+ * @param string|array $binary Data returned from the timeserver
+ * @return integer Difference in seconds
+ */
+ protected function _extract($binary)
+ {
+ /*
+ * Leap Indicator bit 1100 0000
+ *
+ * Code warning of impending leap-second to be inserted at the end of
+ * the last day of the current month.
+ */
+ $leap = ($binary['flags'] & 0xc0) >> 6;
+ switch($leap) {
+ case 0:
+ $this->_info['leap'] = '0 - no warning';
+ break;
+
+ case 1:
+ $this->_info['leap'] = '1 - last minute has 61 seconds';
+ break;
+
+ case 2:
+ $this->_info['leap'] = '2 - last minute has 59 seconds';
+ break;
+
+ default:
+ $this->_info['leap'] = '3 - not syncronised';
+ break;
+ }
+
+ /*
+ * Version Number bit 0011 1000
+ *
+ * This should be 3 (RFC 1305)
+ */
+ $this->_info['version'] = ($binary['flags'] & 0x38) >> 3;
+
+ /*
+ * Mode bit 0000 0111
+ *
+ * Except in broadcast mode, an NTP association is formed when two peers
+ * exchange messages and one or both of them create and maintain an
+ * instantiation of the protocol machine, called an association.
+ */
+ $mode = ($binary['flags'] & 0x07);
+ switch($mode) {
+ case 1:
+ $this->_info['mode'] = 'symetric active';
+ break;
+
+ case 2:
+ $this->_info['mode'] = 'symetric passive';
+ break;
+
+ case 3:
+ $this->_info['mode'] = 'client';
+ break;
+
+ case 4:
+ $this->_info['mode'] = 'server';
+ break;
+
+ case 5:
+ $this->_info['mode'] = 'broadcast';
+ break;
+
+ default:
+ $this->_info['mode'] = 'reserved';
+ break;
+ }
+
+ $ntpserviceid = 'Unknown Stratum ' . $binary['stratum'] . ' Service';
+
+ /*
+ * Reference Clock Identifier
+ *
+ * Identifies the particular reference clock.
+ */
+ $refid = strtoupper($binary['referenceid']);
+ switch($binary['stratum']) {
+ case 0:
+ if (substr($refid, 0, 3) === 'DCN') {
+ $ntpserviceid = 'DCN routing protocol';
+ } else if (substr($refid, 0, 4) === 'NIST') {
+ $ntpserviceid = 'NIST public modem';
+ } else if (substr($refid, 0, 3) === 'TSP') {
+ $ntpserviceid = 'TSP time protocol';
+ } else if (substr($refid, 0, 3) === 'DTS') {
+ $ntpserviceid = 'Digital Time Service';
+ }
+ break;
+
+ case 1:
+ if (substr($refid, 0, 4) === 'ATOM') {
+ $ntpserviceid = 'Atomic Clock (calibrated)';
+ } else if (substr($refid, 0, 3) === 'VLF') {
+ $ntpserviceid = 'VLF radio';
+ } else if ($refid === 'CALLSIGN') {
+ $ntpserviceid = 'Generic radio';
+ } else if (substr($refid, 0, 4) === 'LORC') {
+ $ntpserviceid = 'LORAN-C radionavigation';
+ } else if (substr($refid, 0, 4) === 'GOES') {
+ $ntpserviceid = 'GOES UHF environment satellite';
+ } else if (substr($refid, 0, 3) === 'GPS') {
+ $ntpserviceid = 'GPS UHF satellite positioning';
+ }
+ break;
+
+ default:
+ $ntpserviceid = ord(substr($binary['referenceid'], 0, 1));
+ $ntpserviceid .= '.';
+ $ntpserviceid .= ord(substr($binary['referenceid'], 1, 1));
+ $ntpserviceid .= '.';
+ $ntpserviceid .= ord(substr($binary['referenceid'], 2, 1));
+ $ntpserviceid .= '.';
+ $ntpserviceid .= ord(substr($binary['referenceid'], 3, 1));
+ break;
+ }
+
+ $this->_info['ntpid'] = $ntpserviceid;
+
+ /*
+ * Stratum
+ *
+ * Indicates the stratum level of the local clock
+ */
+ switch($binary['stratum']) {
+ case 0:
+ $this->_info['stratum'] = 'undefined';
+ break;
+
+ case 1:
+ $this->_info['stratum'] = 'primary reference';
+ break;
+
+ default:
+ $this->_info['stratum'] = 'secondary reference';
+ break;
+ }
+
+ /*
+ * Indicates the total roundtrip delay to the primary reference source at the
+ * root of the synchronization subnet, in seconds.
+ *
+ * Both positive and negative values, depending on clock precision and skew, are
+ * possible.
+ */
+ $this->_info['rootdelay'] = $binary['rootdelay'];
+
+ /*
+ * Indicates the maximum error relative to the primary reference source at the
+ * root of the synchronization subnet, in seconds.
+ *
+ * Only positive values greater than zero are possible.
+ */
+ $this->_info['rootdispersion'] = $binary['rootdispersion'];
+
+ /*
+ * The roundtrip delay of the peer clock relative to the local clock
+ * over the network path between them, in seconds.
+ *
+ * Note that this variable can take on both positive and negative values,
+ * depending on clock precision and skew-error accumulation.
+ */
+ $this->_info['roundtrip'] = $binary['receivestamp'];
+ $this->_info['roundtrip'] -= $binary['originatestamp'];
+ $this->_info['roundtrip'] -= $binary['transmitstamp'];
+ $this->_info['roundtrip'] += $binary['clientreceived'];
+ $this->_info['roundtrip'] /= 2;
+
+ // The offset of the peer clock relative to the local clock, in seconds.
+ $this->_info['offset'] = $binary['receivestamp'];
+ $this->_info['offset'] -= $binary['originatestamp'];
+ $this->_info['offset'] += $binary['transmitstamp'];
+ $this->_info['offset'] -= $binary['clientreceived'];
+ $this->_info['offset'] /= 2;
+ $time = (time() - $this->_info['offset']);
+
+ return $time;
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-03 16:36:45 +0000