mirror of
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343 lines
9.4 KiB
PHP
343 lines
9.4 KiB
PHP
<?php
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/**
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* Pure-PHP implementation of SCP.
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*
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* PHP version 5
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*
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* The API for this library is modeled after the API from PHP's {@link http://php.net/book.ftp FTP extension}.
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*
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* Here's a short example of how to use this library:
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* <code>
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* <?php
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* include 'vendor/autoload.php';
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*
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* $ssh = new \phpseclib\Net\SSH2('www.domain.tld');
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* if (!$ssh->login('username', 'password')) {
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* exit('bad login');
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* }
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* $scp = new \phpseclib\Net\SCP($ssh);
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*
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* $scp->put('abcd', str_repeat('x', 1024*1024));
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* ?>
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* </code>
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*
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* @category Net
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* @package SCP
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2010 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;
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use phpseclib\Exception\FileNotFoundException;
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use phpseclib\Common\Functions\Strings;
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use phpseclib\Common\Functions\Objects;
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/**
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* Pure-PHP implementations of SCP.
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*
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* @package SCP
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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 SCP
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{
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/**#@+
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* @access public
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* @see \phpseclib\Net\SCP::put()
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*/
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/**
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* Reads data from a local file.
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*/
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const SOURCE_LOCAL_FILE = 1;
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/**
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* Reads data from a string.
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*/
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const SOURCE_STRING = 2;
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/**#@-*/
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/**#@+
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* @access private
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* @see \phpseclib\Net\SCP::_send()
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* @see \phpseclib\Net\SCP::_receive()
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*/
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/**
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* SSH1 is being used.
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*/
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const MODE_SSH1 = 1;
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/**
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* SSH2 is being used.
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*/
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const MODE_SSH2 = 2;
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/**#@-*/
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/**
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* SSH Object
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*
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* @var object
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* @access private
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*/
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private $ssh;
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/**
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* Packet 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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private $packet_size;
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/**
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* Mode
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*
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* @var int
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* @access private
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*/
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private $mode;
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/**
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* Default Constructor.
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*
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* Connects to an SSH server
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*
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* @param \phpseclib\Net\SSH1|\phpseclib\Net\SSH2 $ssh
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* @access public
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*/
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public function __construct($ssh)
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{
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if ($ssh instanceof SSH2) {
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$this->mode = self::MODE_SSH2;
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} elseif ($ssh instanceof SSH1) {
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$this->packet_size = 50000;
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$this->mode = self::MODE_SSH1;
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} else {
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return;
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}
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$this->ssh = $ssh;
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}
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/**
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* Uploads a file to the SCP server.
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*
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* By default, \phpseclib\Net\SCP::put() does not read from the local filesystem. $data is dumped directly into $remote_file.
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* So, for example, if you set $data to 'filename.ext' and then do \phpseclib\Net\SCP::get(), you will get a file, twelve bytes
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* long, containing 'filename.ext' as its contents.
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*
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* Setting $mode to self::SOURCE_LOCAL_FILE will change the above behavior. With self::SOURCE_LOCAL_FILE, $remote_file will
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* contain as many bytes as filename.ext does on your local filesystem. If your filename.ext is 1MB then that is how
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* large $remote_file will be, as well.
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*
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* Currently, only binary mode is supported. As such, if the line endings need to be adjusted, you will need to take
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* care of that, yourself.
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*
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* @param string $remote_file
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* @param string $data
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* @param int $mode
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* @param callable $callback
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* @throws \phpseclib\Exception\FileNotFoundException if you're uploading via a file and the file doesn't exist
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* @return bool
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* @access public
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*/
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public function put($remote_file, $data, $mode = self::SOURCE_STRING, $callback = null)
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{
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if (!isset($this->ssh)) {
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return false;
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}
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if (!$this->ssh->exec('scp -t ' . escapeshellarg($remote_file), false)) { // -t = to
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return false;
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}
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$temp = $this->receive();
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if ($temp !== chr(0)) {
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return false;
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}
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if ($this->mode == self::MODE_SSH2) {
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$this->packet_size = Objects::getVar($this->ssh, 'packet_size_client_to_server')[SSH2::CHANNEL_EXEC] - 4;
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}
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$remote_file = basename($remote_file);
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if ($mode == self::SOURCE_STRING) {
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$size = strlen($data);
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} else {
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if (!is_file($data)) {
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throw new FileNotFoundException("$data is not a valid file");
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}
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$fp = @fopen($data, 'rb');
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if (!$fp) {
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return false;
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}
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$size = filesize($data);
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}
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$this->send('C0644 ' . $size . ' ' . $remote_file . "\n");
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$temp = $this->receive();
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if ($temp !== chr(0)) {
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return false;
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}
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$sent = 0;
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while ($sent < $size) {
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$temp = $mode & self::SOURCE_STRING ? substr($data, $sent, $this->packet_size) : fread($fp, $this->packet_size);
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$this->send($temp);
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$sent+= strlen($temp);
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if (is_callable($callback)) {
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call_user_func($callback, $sent);
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}
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}
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$this->close();
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if ($mode != self::SOURCE_STRING) {
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fclose($fp);
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}
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return true;
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}
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/**
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* Downloads a file from the SCP server.
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*
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* Returns a string containing the contents of $remote_file if $local_file is left undefined or a boolean false if
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* the operation was unsuccessful. If $local_file is defined, returns true or false depending on the success of the
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* operation
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*
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* @param string $remote_file
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* @param string|bool $local_file
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* @return mixed
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* @access public
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*/
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public function get($remote_file, $local_file = false)
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{
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if (!isset($this->ssh)) {
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return false;
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}
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if (!$this->ssh->exec('scp -f ' . escapeshellarg($remote_file), false)) { // -f = from
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return false;
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}
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$this->send("\0");
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if (!preg_match('#(?<perms>[^ ]+) (?<size>\d+) (?<name>.+)#', rtrim($this->receive()), $info)) {
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return false;
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}
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$this->send("\0");
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$size = 0;
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if ($local_file !== false) {
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$fp = @fopen($local_file, 'wb');
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if (!$fp) {
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return false;
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}
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}
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$content = '';
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while ($size < $info['size']) {
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$data = $this->receive();
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// SCP usually seems to split stuff out into 16k chunks
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$size+= strlen($data);
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if ($local_file === false) {
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$content.= $data;
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} else {
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fputs($fp, $data);
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}
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}
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$this->close();
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if ($local_file !== false) {
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fclose($fp);
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return true;
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}
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return $content;
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}
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/**
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* Sends a packet to an SSH server
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*
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* @param string $data
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* @access private
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*/
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private function send($data)
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{
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switch ($this->mode) {
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case self::MODE_SSH2:
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Objects::callFunc($this->ssh, 'send_channel_packet', [SSH2::CHANNEL_EXEC, $data]);
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break;
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case self::MODE_SSH1:
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$data = pack('CNa*', NET_SSH1_CMSG_STDIN_DATA, strlen($data), $data);
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Objects::callFunc($this->ssh, 'send_binary_packet', [$data]);
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}
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}
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/**
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* Receives a packet from an SSH server
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*
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* @return string
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* @throws \UnexpectedValueException on receipt of an unexpected packet
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* @access private
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*/
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private function receive()
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{
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switch ($this->mode) {
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case self::MODE_SSH2:
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return Objects::callFunc($this->ssh, 'get_channel_packet', [SSH2::CHANNEL_EXEC, true]);
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case self::MODE_SSH1:
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if (!Objects::getVar($this->ssh, 'bitmap')) {
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return false;
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}
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while (true) {
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$response = Objects::getFunc($this->ssh, 'get_binary_packet');
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switch ($response[SSH1::RESPONSE_TYPE]) {
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case NET_SSH1_SMSG_STDOUT_DATA:
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if (strlen($response[SSH1::RESPONSE_DATA]) < 4) {
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return false;
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}
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extract(unpack('Nlength', $response[SSH1::RESPONSE_DATA]));
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/** @var integer $length */
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return Strings::shift($response[SSH1::RESPONSE_DATA], $length);
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case NET_SSH1_SMSG_STDERR_DATA:
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break;
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case NET_SSH1_SMSG_EXITSTATUS:
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Objects::callFunc($this->ssh, 'send_binary_packet', [chr(NET_SSH1_CMSG_EXIT_CONFIRMATION)]);
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fclose(Objects::getVar($this->ssh, 'fsock'));
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Objects::setVar($this->ssh, 'bitmap', 0);
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return false;
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default:
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throw new \UnexpectedValueException('Unknown packet received');
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}
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}
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}
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}
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/**
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* Closes the connection to an SSH server
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*
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* @access private
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*/
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private function close()
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{
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switch ($this->mode) {
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case self::MODE_SSH2:
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Objects::callFunc($this->ssh, 'close_channel', [SSH2::CHANNEL_EXEC, true]);
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break;
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case self::MODE_SSH1:
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Objects::callFunc($this->ssh, 'disconnect');
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}
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}
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}
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