796 lines
21 KiB
PHP
796 lines
21 KiB
PHP
<?php
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/**
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* SFTP Stream Wrapper
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*
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* Creates an sftp:// protocol handler that can be used with, for example, fopen(), dir(), etc.
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*
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* PHP version 5
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*
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* @category Net
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* @package SFTP
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2013 Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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namespace phpseclib\Net\SFTP;
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use phpseclib\Crypt\RSA;
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use phpseclib\Net\SFTP;
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use phpseclib\Net\SSH2;
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/**
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* SFTP Stream Wrapper
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*
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* @package SFTP
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* @author Jim Wigginton <terrafrost@php.net>
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* @access public
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*/
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class Stream
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{
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/**
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* SFTP instances
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*
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* Rather than re-create the connection we re-use instances if possible
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*
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* @var array
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*/
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static $instances;
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/**
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* SFTP instance
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*
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* @var object
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* @access private
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*/
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var $sftp;
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/**
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* Path
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*
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* @var string
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* @access private
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*/
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var $path;
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/**
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* Mode
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*
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* @var string
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* @access private
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*/
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var $mode;
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/**
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* Position
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*
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* @var int
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* @access private
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*/
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var $pos;
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/**
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* Size
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*
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* @var int
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* @access private
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*/
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var $size;
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/**
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* Directory entries
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*
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* @var array
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* @access private
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*/
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var $entries;
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/**
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* EOF flag
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*
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* @var bool
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* @access private
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*/
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var $eof;
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/**
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* Context resource
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*
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* Technically this needs to be publically accessible so PHP can set it directly
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*
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* @var resource
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* @access public
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*/
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var $context;
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/**
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* Notification callback function
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*
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* @var callable
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* @access public
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*/
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var $notification;
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/**
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* Registers this class as a URL wrapper.
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*
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* @param string $protocol The wrapper name to be registered.
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* @return bool True on success, false otherwise.
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* @access public
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*/
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static function register($protocol = 'sftp')
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{
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if (in_array($protocol, stream_get_wrappers(), true)) {
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return false;
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}
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return stream_wrapper_register($protocol, get_called_class());
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}
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/**
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* The Constructor
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*
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* @access public
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*/
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function __construct()
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{
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if (defined('NET_SFTP_STREAM_LOGGING')) {
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echo "__construct()\r\n";
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}
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}
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/**
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* Path Parser
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*
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* Extract a path from a URI and actually connect to an SSH server if appropriate
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*
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* If "notification" is set as a context parameter the message code for successful login is
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* NET_SSH2_MSG_USERAUTH_SUCCESS. For a failed login it's NET_SSH2_MSG_USERAUTH_FAILURE.
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*
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* @param string $path
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* @return string
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* @access private
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*/
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function _parse_path($path)
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{
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$orig = $path;
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extract(parse_url($path) + array('port' => 22));
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if (isset($query)) {
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$path.= '?' . $query;
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} elseif (preg_match('/(\?|\?#)$/', $orig)) {
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$path.= '?';
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}
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if (isset($fragment)) {
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$path.= '#' . $fragment;
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} elseif ($orig[strlen($orig) - 1] == '#') {
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$path.= '#';
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}
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if (!isset($host)) {
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return false;
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}
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if (isset($this->context)) {
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$context = stream_context_get_params($this->context);
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if (isset($context['notification'])) {
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$this->notification = $context['notification'];
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}
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}
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if (preg_match('/^{[a-z0-9]+}$/i', $host)) {
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$host = SSH2::getConnectionByResourceId($host);
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if ($host === false) {
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return false;
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}
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$this->sftp = $host;
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} else {
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if (isset($this->context)) {
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$context = stream_context_get_options($this->context);
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}
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if (isset($context[$scheme]['session'])) {
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$sftp = $context[$scheme]['session'];
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}
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if (isset($context[$scheme]['sftp'])) {
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$sftp = $context[$scheme]['sftp'];
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}
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if (isset($sftp) && $sftp instanceof SFTP) {
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$this->sftp = $sftp;
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return $path;
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}
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if (isset($context[$scheme]['username'])) {
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$user = $context[$scheme]['username'];
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}
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if (isset($context[$scheme]['password'])) {
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$pass = $context[$scheme]['password'];
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}
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if (isset($context[$scheme]['privkey']) && $context[$scheme]['privkey'] instanceof RSA) {
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$pass = $context[$scheme]['privkey'];
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}
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if (!isset($user) || !isset($pass)) {
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return false;
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}
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// casting $pass to a string is necessary in the event that it's a \phpseclib\Crypt\RSA object
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if (isset(self::$instances[$host][$port][$user][(string) $pass])) {
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$this->sftp = self::$instances[$host][$port][$user][(string) $pass];
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} else {
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$this->sftp = new SFTP($host, $port);
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$this->sftp->disableStatCache();
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if (isset($this->notification) && is_callable($this->notification)) {
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/* if !is_callable($this->notification) we could do this:
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user_error('fopen(): failed to call user notifier', E_USER_WARNING);
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the ftp wrapper gives errors like that when the notifier isn't callable.
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i've opted not to do that, however, since the ftp wrapper gives the line
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on which the fopen occurred as the line number - not the line that the
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user_error is on.
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*/
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call_user_func($this->notification, STREAM_NOTIFY_CONNECT, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
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call_user_func($this->notification, STREAM_NOTIFY_AUTH_REQUIRED, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
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if (!$this->sftp->login($user, $pass)) {
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call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_ERR, 'Login Failure', NET_SSH2_MSG_USERAUTH_FAILURE, 0, 0);
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return false;
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}
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call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_INFO, 'Login Success', NET_SSH2_MSG_USERAUTH_SUCCESS, 0, 0);
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} else {
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if (!$this->sftp->login($user, $pass)) {
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return false;
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}
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}
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self::$instances[$host][$port][$user][(string) $pass] = $this->sftp;
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}
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}
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return $path;
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}
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/**
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* Opens file or URL
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*
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* @param string $path
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* @param string $mode
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* @param int $options
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* @param string $opened_path
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* @return bool
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* @access public
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*/
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function _stream_open($path, $mode, $options, &$opened_path)
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{
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$path = $this->_parse_path($path);
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if ($path === false) {
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return false;
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}
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$this->path = $path;
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$this->size = $this->sftp->size($path);
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$this->mode = preg_replace('#[bt]$#', '', $mode);
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$this->eof = false;
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if ($this->size === false) {
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if ($this->mode[0] == 'r') {
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return false;
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} else {
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$this->sftp->touch($path);
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$this->size = 0;
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}
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} else {
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switch ($this->mode[0]) {
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case 'x':
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return false;
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case 'w':
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$this->sftp->truncate($path, 0);
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$this->size = 0;
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}
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}
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$this->pos = $this->mode[0] != 'a' ? 0 : $this->size;
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return true;
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}
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/**
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* Read from stream
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*
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* @param int $count
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* @return mixed
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* @access public
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*/
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function _stream_read($count)
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{
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switch ($this->mode) {
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case 'w':
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case 'a':
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case 'x':
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case 'c':
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return false;
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}
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// commented out because some files - eg. /dev/urandom - will say their size is 0 when in fact it's kinda infinite
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//if ($this->pos >= $this->size) {
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// $this->eof = true;
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// return false;
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//}
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$result = $this->sftp->get($this->path, false, $this->pos, $count);
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if (isset($this->notification) && is_callable($this->notification)) {
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if ($result === false) {
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call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
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return 0;
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}
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// seems that PHP calls stream_read in 8k chunks
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call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($result), $this->size);
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}
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if (empty($result)) { // ie. false or empty string
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$this->eof = true;
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return false;
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}
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$this->pos+= strlen($result);
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return $result;
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}
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/**
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* Write to stream
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*
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* @param string $data
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* @return mixed
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* @access public
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*/
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function _stream_write($data)
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{
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switch ($this->mode) {
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case 'r':
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return false;
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}
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$result = $this->sftp->put($this->path, $data, SFTP::SOURCE_STRING, $this->pos);
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if (isset($this->notification) && is_callable($this->notification)) {
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if (!$result) {
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call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
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return 0;
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}
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// seems that PHP splits up strings into 8k blocks before calling stream_write
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call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($data), strlen($data));
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}
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if ($result === false) {
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return false;
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}
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$this->pos+= strlen($data);
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if ($this->pos > $this->size) {
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$this->size = $this->pos;
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}
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$this->eof = false;
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return strlen($data);
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}
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/**
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* Retrieve the current position of a stream
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*
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* @return int
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* @access public
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*/
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function _stream_tell()
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{
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return $this->pos;
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}
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/**
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* Tests for end-of-file on a file pointer
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*
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* In my testing there are four classes functions that normally effect the pointer:
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* fseek, fputs / fwrite, fgets / fread and ftruncate.
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*
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* Only fgets / fread, however, results in feof() returning true. do fputs($fp, 'aaa') on a blank file and feof()
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* will return false. do fread($fp, 1) and feof() will then return true. do fseek($fp, 10) on ablank file and feof()
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* will return false. do fread($fp, 1) and feof() will then return true.
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*
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* @return bool
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* @access public
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*/
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function _stream_eof()
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{
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return $this->eof;
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}
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/**
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* Seeks to specific location in a stream
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*
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* @param int $offset
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* @param int $whence
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* @return bool
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* @access public
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*/
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function _stream_seek($offset, $whence)
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{
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switch ($whence) {
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case SEEK_SET:
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if ($offset >= $this->size || $offset < 0) {
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return false;
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}
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break;
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case SEEK_CUR:
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$offset+= $this->pos;
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break;
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case SEEK_END:
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$offset+= $this->size;
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}
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$this->pos = $offset;
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$this->eof = false;
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return true;
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}
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/**
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* Change stream options
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*
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* @param string $path
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* @param int $option
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* @param mixed $var
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* @return bool
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* @access public
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*/
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function _stream_metadata($path, $option, $var)
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{
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$path = $this->_parse_path($path);
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if ($path === false) {
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return false;
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}
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// stream_metadata was introduced in PHP 5.4.0 but as of 5.4.11 the constants haven't been defined
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// see http://www.php.net/streamwrapper.stream-metadata and https://bugs.php.net/64246
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// and https://github.com/php/php-src/blob/master/main/php_streams.h#L592
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switch ($option) {
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case 1: // PHP_STREAM_META_TOUCH
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return $this->sftp->touch($path, $var[0], $var[1]);
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case 2: // PHP_STREAM_OWNER_NAME
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case 3: // PHP_STREAM_GROUP_NAME
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return false;
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case 4: // PHP_STREAM_META_OWNER
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return $this->sftp->chown($path, $var);
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case 5: // PHP_STREAM_META_GROUP
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return $this->sftp->chgrp($path, $var);
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case 6: // PHP_STREAM_META_ACCESS
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return $this->sftp->chmod($path, $var) !== false;
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}
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}
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/**
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* Retrieve the underlaying resource
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*
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* @param int $cast_as
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* @return resource
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* @access public
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*/
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function _stream_cast($cast_as)
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{
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return $this->sftp->fsock;
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}
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/**
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* Advisory file locking
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*
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* @param int $operation
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* @return bool
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* @access public
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*/
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function _stream_lock($operation)
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{
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return false;
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}
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/**
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* Renames a file or directory
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*
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* Attempts to rename oldname to newname, moving it between directories if necessary.
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* If newname exists, it will be overwritten. This is a departure from what \phpseclib\Net\SFTP
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* does.
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*
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* @param string $path_from
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* @param string $path_to
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* @return bool
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* @access public
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*/
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function _rename($path_from, $path_to)
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{
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$path1 = parse_url($path_from);
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$path2 = parse_url($path_to);
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unset($path1['path'], $path2['path']);
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if ($path1 != $path2) {
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return false;
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}
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$path_from = $this->_parse_path($path_from);
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$path_to = parse_url($path_to);
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if ($path_from === false) {
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return false;
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}
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$path_to = $path_to['path']; // the $component part of parse_url() was added in PHP 5.1.2
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// "It is an error if there already exists a file with the name specified by newpath."
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// -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-6.5
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if (!$this->sftp->rename($path_from, $path_to)) {
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if ($this->sftp->stat($path_to)) {
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return $this->sftp->delete($path_to, true) && $this->sftp->rename($path_from, $path_to);
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}
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return false;
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}
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return true;
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}
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/**
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* Open directory handle
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*
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* The only $options is "whether or not to enforce safe_mode (0x04)". Since safe mode was deprecated in 5.3 and
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* removed in 5.4 I'm just going to ignore it.
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*
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* Also, nlist() is the best that this function is realistically going to be able to do. When an SFTP client
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* sends a SSH_FXP_READDIR packet you don't generally get info on just one file but on multiple files. Quoting
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* the SFTP specs:
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*
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* The SSH_FXP_NAME response has the following format:
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*
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* uint32 id
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* uint32 count
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* repeats count times:
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* string filename
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* string longname
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* ATTRS attrs
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*
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* @param string $path
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* @param int $options
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* @return bool
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* @access public
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*/
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function _dir_opendir($path, $options)
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{
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$path = $this->_parse_path($path);
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if ($path === false) {
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return false;
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}
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$this->pos = 0;
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$this->entries = $this->sftp->nlist($path);
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return $this->entries !== false;
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}
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/**
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* Read entry from directory handle
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*
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* @return mixed
|
|
* @access public
|
|
*/
|
|
function _dir_readdir()
|
|
{
|
|
if (isset($this->entries[$this->pos])) {
|
|
return $this->entries[$this->pos++];
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Rewind directory handle
|
|
*
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _dir_rewinddir()
|
|
{
|
|
$this->pos = 0;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Close directory handle
|
|
*
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _dir_closedir()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Create a directory
|
|
*
|
|
* Only valid $options is STREAM_MKDIR_RECURSIVE
|
|
*
|
|
* @param string $path
|
|
* @param int $mode
|
|
* @param int $options
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _mkdir($path, $mode, $options)
|
|
{
|
|
$path = $this->_parse_path($path);
|
|
if ($path === false) {
|
|
return false;
|
|
}
|
|
|
|
return $this->sftp->mkdir($path, $mode, $options & STREAM_MKDIR_RECURSIVE);
|
|
}
|
|
|
|
/**
|
|
* Removes a directory
|
|
*
|
|
* Only valid $options is STREAM_MKDIR_RECURSIVE per <http://php.net/streamwrapper.rmdir>, however,
|
|
* <http://php.net/rmdir> does not have a $recursive parameter as mkdir() does so I don't know how
|
|
* STREAM_MKDIR_RECURSIVE is supposed to be set. Also, when I try it out with rmdir() I get 8 as
|
|
* $options. What does 8 correspond to?
|
|
*
|
|
* @param string $path
|
|
* @param int $mode
|
|
* @param int $options
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _rmdir($path, $options)
|
|
{
|
|
$path = $this->_parse_path($path);
|
|
if ($path === false) {
|
|
return false;
|
|
}
|
|
|
|
return $this->sftp->rmdir($path);
|
|
}
|
|
|
|
/**
|
|
* Flushes the output
|
|
*
|
|
* See <http://php.net/fflush>. Always returns true because \phpseclib\Net\SFTP doesn't cache stuff before writing
|
|
*
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _stream_flush()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Retrieve information about a file resource
|
|
*
|
|
* @return mixed
|
|
* @access public
|
|
*/
|
|
function _stream_stat()
|
|
{
|
|
$results = $this->sftp->stat($this->path);
|
|
if ($results === false) {
|
|
return false;
|
|
}
|
|
return $results;
|
|
}
|
|
|
|
/**
|
|
* Delete a file
|
|
*
|
|
* @param string $path
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _unlink($path)
|
|
{
|
|
$path = $this->_parse_path($path);
|
|
if ($path === false) {
|
|
return false;
|
|
}
|
|
|
|
return $this->sftp->delete($path, false);
|
|
}
|
|
|
|
/**
|
|
* Retrieve information about a file
|
|
*
|
|
* Ignores the STREAM_URL_STAT_QUIET flag because the entirety of \phpseclib\Net\SFTP\Stream is quiet by default
|
|
* might be worthwhile to reconstruct bits 12-16 (ie. the file type) if mode doesn't have them but we'll
|
|
* cross that bridge when and if it's reached
|
|
*
|
|
* @param string $path
|
|
* @param int $flags
|
|
* @return mixed
|
|
* @access public
|
|
*/
|
|
function _url_stat($path, $flags)
|
|
{
|
|
$path = $this->_parse_path($path);
|
|
if ($path === false) {
|
|
return false;
|
|
}
|
|
|
|
$results = $flags & STREAM_URL_STAT_LINK ? $this->sftp->lstat($path) : $this->sftp->stat($path);
|
|
if ($results === false) {
|
|
return false;
|
|
}
|
|
|
|
return $results;
|
|
}
|
|
|
|
/**
|
|
* Truncate stream
|
|
*
|
|
* @param int $new_size
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _stream_truncate($new_size)
|
|
{
|
|
if (!$this->sftp->truncate($this->path, $new_size)) {
|
|
return false;
|
|
}
|
|
|
|
$this->eof = false;
|
|
$this->size = $new_size;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Change stream options
|
|
*
|
|
* STREAM_OPTION_WRITE_BUFFER isn't supported for the same reason stream_flush isn't.
|
|
* The other two aren't supported because of limitations in \phpseclib\Net\SFTP.
|
|
*
|
|
* @param int $option
|
|
* @param int $arg1
|
|
* @param int $arg2
|
|
* @return bool
|
|
* @access public
|
|
*/
|
|
function _stream_set_option($option, $arg1, $arg2)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Close an resource
|
|
*
|
|
* @access public
|
|
*/
|
|
function _stream_close()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* __call Magic Method
|
|
*
|
|
* When you're utilizing an SFTP stream you're not calling the methods in this class directly - PHP is calling them for you.
|
|
* Which kinda begs the question... what methods is PHP calling and what parameters is it passing to them? This function
|
|
* lets you figure that out.
|
|
*
|
|
* If NET_SFTP_STREAM_LOGGING is defined all calls will be output on the screen and then (regardless of whether or not
|
|
* NET_SFTP_STREAM_LOGGING is enabled) the parameters will be passed through to the appropriate method.
|
|
*
|
|
* @param string
|
|
* @param array
|
|
* @return mixed
|
|
* @access public
|
|
*/
|
|
function __call($name, $arguments)
|
|
{
|
|
if (defined('NET_SFTP_STREAM_LOGGING')) {
|
|
echo $name . '(';
|
|
$last = count($arguments) - 1;
|
|
foreach ($arguments as $i => $argument) {
|
|
var_export($argument);
|
|
if ($i != $last) {
|
|
echo ',';
|
|
}
|
|
}
|
|
echo ")\r\n";
|
|
}
|
|
$name = '_' . $name;
|
|
if (!method_exists($this, $name)) {
|
|
return false;
|
|
}
|
|
return call_user_func_array(array($this, $name), $arguments);
|
|
}
|
|
}
|