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SFTP.php
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SFTP.php
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<?php
/**
* Pure-PHP implementation of SFTP.
*
* PHP version 5
*
* Supports SFTPv2/3/4/5/6. Defaults to v3.
*
* The API for this library is modeled after the API from PHP's {@link http://php.net/book.ftp FTP extension}.
*
* Here's a short example of how to use this library:
* <code>
* <?php
* include 'vendor/autoload.php';
*
* $sftp = new \phpseclib\Net\SFTP('www.domain.tld');
* if (!$sftp->login('username', 'password')) {
* exit('Login Failed');
* }
*
* echo $sftp->pwd() . "\r\n";
* $sftp->put('filename.ext', 'hello, world!');
* print_r($sftp->nlist());
* ?>
* </code>
*
* @category Net
* @package SFTP
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2009 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib\Net;
/**
* Pure-PHP implementations of SFTP.
*
* @package SFTP
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
class SFTP extends SSH2
{
/**
* SFTP channel constant
*
* \phpseclib\Net\SSH2::exec() uses 0 and \phpseclib\Net\SSH2::read() / \phpseclib\Net\SSH2::write() use 1.
*
* @see \phpseclib\Net\SSH2::_send_channel_packet()
* @see \phpseclib\Net\SSH2::_get_channel_packet()
* @access private
*/
const CHANNEL = 0x100;
/**#@+
* @access public
* @see \phpseclib\Net\SFTP::put()
*/
/**
* Reads data from a local file.
*/
const SOURCE_LOCAL_FILE = 1;
/**
* Reads data from a string.
*/
// this value isn't really used anymore but i'm keeping it reserved for historical reasons
const SOURCE_STRING = 2;
/**
* Reads data from callback:
* function callback($length) returns string to proceed, null for EOF
*/
const SOURCE_CALLBACK = 16;
/**
* Resumes an upload
*/
const RESUME = 4;
/**
* Append a local file to an already existing remote file
*/
const RESUME_START = 8;
/**#@-*/
/**
* Packet Types
*
* @see self::__construct()
* @var array
* @access private
*/
var $packet_types = array();
/**
* Status Codes
*
* @see self::__construct()
* @var array
* @access private
*/
var $status_codes = array();
/**
* The Request ID
*
* The request ID exists in the off chance that a packet is sent out-of-order. Of course, this library doesn't support
* concurrent actions, so it's somewhat academic, here.
*
* @var boolean
* @see self::_send_sftp_packet()
* @access private
*/
var $use_request_id = false;
/**
* The Packet Type
*
* The request ID exists in the off chance that a packet is sent out-of-order. Of course, this library doesn't support
* concurrent actions, so it's somewhat academic, here.
*
* @var int
* @see self::_get_sftp_packet()
* @access private
*/
var $packet_type = -1;
/**
* Packet Buffer
*
* @var string
* @see self::_get_sftp_packet()
* @access private
*/
var $packet_buffer = '';
/**
* Extensions supported by the server
*
* @var array
* @see self::_initChannel()
* @access private
*/
var $extensions = array();
/**
* Server SFTP version
*
* @var int
* @see self::_initChannel()
* @access private
*/
var $version;
/**
* Default Server SFTP version
*
* @var int
* @see self::_initChannel()
* @access private
*/
var $defaultVersion;
/**
* Preferred SFTP version
*
* @var int
* @see self::_initChannel()
* @access private
*/
var $preferredVersion = 3;
/**
* Current working directory
*
* @var string
* @see self::realpath()
* @see self::chdir()
* @access private
*/
var $pwd = false;
/**
* Packet Type Log
*
* @see self::getLog()
* @var array
* @access private
*/
var $packet_type_log = array();
/**
* Packet Log
*
* @see self::getLog()
* @var array
* @access private
*/
var $packet_log = array();
/**
* Error information
*
* @see self::getSFTPErrors()
* @see self::getLastSFTPError()
* @var array
* @access private
*/
var $sftp_errors = array();
/**
* Stat Cache
*
* Rather than always having to open a directory and close it immediately there after to see if a file is a directory
* we'll cache the results.
*
* @see self::_update_stat_cache()
* @see self::_remove_from_stat_cache()
* @see self::_query_stat_cache()
* @var array
* @access private
*/
var $stat_cache = array();
/**
* Max SFTP Packet Size
*
* @see self::__construct()
* @see self::get()
* @var array
* @access private
*/
var $max_sftp_packet;
/**
* Stat Cache Flag
*
* @see self::disableStatCache()
* @see self::enableStatCache()
* @var bool
* @access private
*/
var $use_stat_cache = true;
/**
* Sort Options
*
* @see self::_comparator()
* @see self::setListOrder()
* @var array
* @access private
*/
var $sortOptions = array();
/**
* Canonicalization Flag
*
* Determines whether or not paths should be canonicalized before being
* passed on to the remote server.
*
* @see self::enablePathCanonicalization()
* @see self::disablePathCanonicalization()
* @see self::realpath()
* @var bool
* @access private
*/
var $canonicalize_paths = true;
/**
* Request Buffers
*
* @see self::_get_sftp_packet()
* @var array
* @access private
*/
var $requestBuffer = array();
/**
* Preserve timestamps on file downloads / uploads
*
* @see self::get()
* @see self::put()
* @var bool
* @access private
*/
var $preserveTime = false;
/**
* Arbitrary Length Packets Flag
*
* Determines whether or not packets of any length should be allowed,
* in cases where the server chooses the packet length (such as
* directory listings). By default, packets are only allowed to be
* 256 * 1024 bytes (SFTP_MAX_MSG_LENGTH from OpenSSH's sftp-common.h)
*
* @see self::enableArbitraryLengthPackets()
* @see self::_get_sftp_packet()
* @var bool
* @access private
*/
var $allow_arbitrary_length_packets = false;
/**
* Was the last packet due to the channels being closed or not?
*
* @see self::get()
* @see self::get_sftp_packet()
* @var bool
* @access private
*/
var $channel_close = false;
/**
* Has the SFTP channel been partially negotiated?
*
* @var bool
* @access private
*/
var $partial_init = false;
/**
* Default Constructor.
*
* Connects to an SFTP server
*
* @param string $host
* @param int $port
* @param int $timeout
* @return \phpseclib\Net\SFTP
* @access public
*/
function __construct($host, $port = 22, $timeout = 10)
{
parent::__construct($host, $port, $timeout);
$this->max_sftp_packet = 1 << 15;
$this->packet_types = array(
1 => 'NET_SFTP_INIT',
2 => 'NET_SFTP_VERSION',
3 => 'NET_SFTP_OPEN',
4 => 'NET_SFTP_CLOSE',
5 => 'NET_SFTP_READ',
6 => 'NET_SFTP_WRITE',
7 => 'NET_SFTP_LSTAT',
9 => 'NET_SFTP_SETSTAT',
10 => 'NET_SFTP_FSETSTAT',
11 => 'NET_SFTP_OPENDIR',
12 => 'NET_SFTP_READDIR',
13 => 'NET_SFTP_REMOVE',
14 => 'NET_SFTP_MKDIR',
15 => 'NET_SFTP_RMDIR',
16 => 'NET_SFTP_REALPATH',
17 => 'NET_SFTP_STAT',
18 => 'NET_SFTP_RENAME',
19 => 'NET_SFTP_READLINK',
20 => 'NET_SFTP_SYMLINK',
21 => 'NET_SFTP_LINK',
101=> 'NET_SFTP_STATUS',
102=> 'NET_SFTP_HANDLE',
103=> 'NET_SFTP_DATA',
104=> 'NET_SFTP_NAME',
105=> 'NET_SFTP_ATTRS',
200=> 'NET_SFTP_EXTENDED'
);
$this->status_codes = array(
0 => 'NET_SFTP_STATUS_OK',
1 => 'NET_SFTP_STATUS_EOF',
2 => 'NET_SFTP_STATUS_NO_SUCH_FILE',
3 => 'NET_SFTP_STATUS_PERMISSION_DENIED',
4 => 'NET_SFTP_STATUS_FAILURE',
5 => 'NET_SFTP_STATUS_BAD_MESSAGE',
6 => 'NET_SFTP_STATUS_NO_CONNECTION',
7 => 'NET_SFTP_STATUS_CONNECTION_LOST',
8 => 'NET_SFTP_STATUS_OP_UNSUPPORTED',
9 => 'NET_SFTP_STATUS_INVALID_HANDLE',
10 => 'NET_SFTP_STATUS_NO_SUCH_PATH',
11 => 'NET_SFTP_STATUS_FILE_ALREADY_EXISTS',
12 => 'NET_SFTP_STATUS_WRITE_PROTECT',
13 => 'NET_SFTP_STATUS_NO_MEDIA',
14 => 'NET_SFTP_STATUS_NO_SPACE_ON_FILESYSTEM',
15 => 'NET_SFTP_STATUS_QUOTA_EXCEEDED',
16 => 'NET_SFTP_STATUS_UNKNOWN_PRINCIPAL',
17 => 'NET_SFTP_STATUS_LOCK_CONFLICT',
18 => 'NET_SFTP_STATUS_DIR_NOT_EMPTY',
19 => 'NET_SFTP_STATUS_NOT_A_DIRECTORY',
20 => 'NET_SFTP_STATUS_INVALID_FILENAME',
21 => 'NET_SFTP_STATUS_LINK_LOOP',
22 => 'NET_SFTP_STATUS_CANNOT_DELETE',
23 => 'NET_SFTP_STATUS_INVALID_PARAMETER',
24 => 'NET_SFTP_STATUS_FILE_IS_A_DIRECTORY',
25 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_CONFLICT',
26 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_REFUSED',
27 => 'NET_SFTP_STATUS_DELETE_PENDING',
28 => 'NET_SFTP_STATUS_FILE_CORRUPT',
29 => 'NET_SFTP_STATUS_OWNER_INVALID',
30 => 'NET_SFTP_STATUS_GROUP_INVALID',
31 => 'NET_SFTP_STATUS_NO_MATCHING_BYTE_RANGE_LOCK'
);
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-7.1
// the order, in this case, matters quite a lot - see \phpseclib\Net\SFTP::_parseAttributes() to understand why
$this->attributes = array(
0x00000001 => 'NET_SFTP_ATTR_SIZE',
0x00000002 => 'NET_SFTP_ATTR_UIDGID', // defined in SFTPv3, removed in SFTPv4+
0x00000080 => 'NET_SFTP_ATTR_OWNERGROUP', // defined in SFTPv4+
0x00000004 => 'NET_SFTP_ATTR_PERMISSIONS',
0x00000008 => 'NET_SFTP_ATTR_ACCESSTIME',
0x00000010 => 'NET_SFTP_ATTR_CREATETIME', // SFTPv4+
0x00000020 => 'NET_SFTP_ATTR_MODIFYTIME',
0x00000040 => 'NET_SFTP_ATTR_ACL',
0x00000100 => 'NET_SFTP_ATTR_SUBSECOND_TIMES',
0x00000200 => 'NET_SFTP_ATTR_BITS', // SFTPv5+
0x00000400 => 'NET_SFTP_ATTR_ALLOCATION_SIZE', // SFTPv6+
0x00000800 => 'NET_SFTP_ATTR_TEXT_HINT',
0x00001000 => 'NET_SFTP_ATTR_MIME_TYPE',
0x00002000 => 'NET_SFTP_ATTR_LINK_COUNT',
0x00004000 => 'NET_SFTP_ATTR_UNTRANSLATED_NAME',
0x00008000 => 'NET_SFTP_ATTR_CTIME',
// 0x80000000 will yield a floating point on 32-bit systems and converting floating points to integers
// yields inconsistent behavior depending on how php is compiled. so we left shift -1 (which, in
// two's compliment, consists of all 1 bits) by 31. on 64-bit systems this'll yield 0xFFFFFFFF80000000.
// that's not a problem, however, and 'anded' and a 32-bit number, as all the leading 1 bits are ignored.
(-1 << 31) & 0xFFFFFFFF => 'NET_SFTP_ATTR_EXTENDED'
);
$this->open_flags = array(
0x00000001 => 'NET_SFTP_OPEN_READ',
0x00000002 => 'NET_SFTP_OPEN_WRITE',
0x00000004 => 'NET_SFTP_OPEN_APPEND',
0x00000008 => 'NET_SFTP_OPEN_CREATE',
0x00000010 => 'NET_SFTP_OPEN_TRUNCATE',
0x00000020 => 'NET_SFTP_OPEN_EXCL',
0x00000040 => 'NET_SFTP_OPEN_TEXT' // defined in SFTPv4
);
// SFTPv5+ changed the flags up:
// https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-8.1.1.3
$this->open_flags5 = array(
// when SSH_FXF_ACCESS_DISPOSITION is a 3 bit field that controls how the file is opened
0x00000000 => 'NET_SFTP_OPEN_CREATE_NEW',
0x00000001 => 'NET_SFTP_OPEN_CREATE_TRUNCATE',
0x00000002 => 'NET_SFTP_OPEN_OPEN_EXISTING',
0x00000003 => 'NET_SFTP_OPEN_OPEN_OR_CREATE',
0x00000004 => 'NET_SFTP_OPEN_TRUNCATE_EXISTING',
// the rest of the flags are not supported
0x00000008 => 'NET_SFTP_OPEN_APPEND_DATA', // "the offset field of SS_FXP_WRITE requests is ignored"
0x00000010 => 'NET_SFTP_OPEN_APPEND_DATA_ATOMIC',
0x00000020 => 'NET_SFTP_OPEN_TEXT_MODE',
0x00000040 => 'NET_SFTP_OPEN_BLOCK_READ',
0x00000080 => 'NET_SFTP_OPEN_BLOCK_WRITE',
0x00000100 => 'NET_SFTP_OPEN_BLOCK_DELETE',
0x00000200 => 'NET_SFTP_OPEN_BLOCK_ADVISORY',
0x00000400 => 'NET_SFTP_OPEN_NOFOLLOW',
0x00000800 => 'NET_SFTP_OPEN_DELETE_ON_CLOSE',
0x00001000 => 'NET_SFTP_OPEN_ACCESS_AUDIT_ALARM_INFO',
0x00002000 => 'NET_SFTP_OPEN_ACCESS_BACKUP',
0x00004000 => 'NET_SFTP_OPEN_BACKUP_STREAM',
0x00008000 => 'NET_SFTP_OPEN_OVERRIDE_OWNER',
);
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2
// see \phpseclib\Net\SFTP::_parseLongname() for an explanation
$this->file_types = array(
1 => 'NET_SFTP_TYPE_REGULAR',
2 => 'NET_SFTP_TYPE_DIRECTORY',
3 => 'NET_SFTP_TYPE_SYMLINK',
4 => 'NET_SFTP_TYPE_SPECIAL',
5 => 'NET_SFTP_TYPE_UNKNOWN',
// the followin types were first defined for use in SFTPv5+
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2
6 => 'NET_SFTP_TYPE_SOCKET',
7 => 'NET_SFTP_TYPE_CHAR_DEVICE',
8 => 'NET_SFTP_TYPE_BLOCK_DEVICE',
9 => 'NET_SFTP_TYPE_FIFO'
);
$this->_define_array(
$this->packet_types,
$this->status_codes,
$this->attributes,
$this->open_flags,
$this->open_flags5,
$this->file_types
);
if (!defined('NET_SFTP_QUEUE_SIZE')) {
define('NET_SFTP_QUEUE_SIZE', 32);
}
if (!defined('NET_SFTP_UPLOAD_QUEUE_SIZE')) {
define('NET_SFTP_UPLOAD_QUEUE_SIZE', 1024);
}
}
/**
* Check a few things before SFTP functions are called
*
* @return bool
* @access public
*/
function _precheck()
{
if (!($this->bitmap & SSH2::MASK_LOGIN)) {
return false;
}
if ($this->pwd === false) {
return $this->_init_sftp_connection();
}
return true;
}
/**
* Partially initialize an SFTP connection
*
* @return bool
* @access public
*/
function _partial_init_sftp_connection()
{
$this->window_size_server_to_client[self::CHANNEL] = $this->window_size;
$packet = pack(
'CNa*N3',
NET_SSH2_MSG_CHANNEL_OPEN,
strlen('session'),
'session',
self::CHANNEL,
$this->window_size,
0x4000
);
if (!$this->_send_binary_packet($packet)) {
return false;
}
$this->channel_status[self::CHANNEL] = NET_SSH2_MSG_CHANNEL_OPEN;
$response = $this->_get_channel_packet(self::CHANNEL, true);
if ($response === false) {
return false;
} elseif ($response === true && $this->isTimeout()) {
return false;
}
$packet = pack(
'CNNa*CNa*',
NET_SSH2_MSG_CHANNEL_REQUEST,
$this->server_channels[self::CHANNEL],
strlen('subsystem'),
'subsystem',
1,
strlen('sftp'),
'sftp'
);
if (!$this->_send_binary_packet($packet)) {
return false;
}
$this->channel_status[self::CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;
$response = $this->_get_channel_packet(self::CHANNEL, true);
if ($response === false) {
// from PuTTY's psftp.exe
$command = "test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n" .
"test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n" .
"exec sftp-server";
// we don't do $this->exec($command, false) because exec() operates on a different channel and plus the SSH_MSG_CHANNEL_OPEN that exec() does
// is redundant
$packet = pack(
'CNNa*CNa*',
NET_SSH2_MSG_CHANNEL_REQUEST,
$this->server_channels[self::CHANNEL],
strlen('exec'),
'exec',
1,
strlen($command),
$command
);
if (!$this->_send_binary_packet($packet)) {
return false;
}
$this->channel_status[self::CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;
$response = $this->_get_channel_packet(self::CHANNEL, true);
if ($response === false) {
return false;
}
} elseif ($response === true && $this->isTimeout()) {
return false;
}
$this->channel_status[self::CHANNEL] = NET_SSH2_MSG_CHANNEL_DATA;
if (!$this->_send_sftp_packet(NET_SFTP_INIT, "\0\0\0\3")) {
return false;
}
$response = $this->_get_sftp_packet();
if ($this->packet_type != NET_SFTP_VERSION) {
user_error('Expected SSH_FXP_VERSION');
return false;
}
$this->use_request_id = true;
if (strlen($response) < 4) {
return false;
}
extract(unpack('Nversion', $this->_string_shift($response, 4)));
$this->defaultVersion = $version;
while (!empty($response)) {
if (strlen($response) < 4) {
return false;
}
extract(unpack('Nlength', $this->_string_shift($response, 4)));
$key = $this->_string_shift($response, $length);
if (strlen($response) < 4) {
return false;
}
extract(unpack('Nlength', $this->_string_shift($response, 4)));
$value = $this->_string_shift($response, $length);
$this->extensions[$key] = $value;
}
$this->partial_init = true;
return true;
}
/**
* (Re)initializes the SFTP channel
*
* @return bool
* @access private
*/
function _init_sftp_connection()
{
if (!$this->partial_init && !$this->_partial_init_sftp_connection()) {
return false;
}
/*
A Note on SFTPv4/5/6 support:
<http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-5.1> states the following:
"If the client wishes to interoperate with servers that support noncontiguous version
numbers it SHOULD send '3'"
Given that the server only sends its version number after the client has already done so, the above
seems to be suggesting that v3 should be the default version. This makes sense given that v3 is the
most popular.
<http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-5.5> states the following;
"If the server did not send the "versions" extension, or the version-from-list was not included, the
server MAY send a status response describing the failure, but MUST then close the channel without
processing any further requests."
So what do you do if you have a client whose initial SSH_FXP_INIT packet says it implements v3 and
a server whose initial SSH_FXP_VERSION reply says it implements v4 and only v4? If it only implements
v4, the "versions" extension is likely not going to have been sent so version re-negotiation as discussed
in draft-ietf-secsh-filexfer-13 would be quite impossible. As such, what \phpseclib\Net\SFTP would do is close the
channel and reopen it with a new and updated SSH_FXP_INIT packet.
*/
$this->version = $this->defaultVersion;
if (isset($this->extensions['versions']) && (!$this->preferredVersion || $this->preferredVersion != $this->version)) {
$versions = explode(',', $this->extensions['versions']);
$supported = array(6, 5, 4);
if ($this->preferredVersion) {
$supported = array_diff($supported, array($this->preferredVersion));
array_unshift($supported, $this->preferredVersion);
}
foreach ($supported as $ver) {
if (in_array($ver, $versions)) {
if ($ver === $this->version) {
break;
}
$this->version = (int) $ver;
$packet = pack('Na*Na*', strlen('version-select'), 'version-select', strlen($ver), $ver);
if (!$this->_send_sftp_packet(NET_SFTP_EXTENDED, $packet)) {
return false;
}
$response = $this->_get_sftp_packet();
if ($this->packet_type != NET_SFTP_STATUS) {
user_error('Expected SSH_FXP_STATUS');
return false;
}
if (strlen($response) < 4) {
return false;
}
extract(unpack('Nstatus', $this->_string_shift($response, 4)));
if ($status != NET_SFTP_STATUS_OK) {
$this->_logError($response, $status);
return false;
}
break;
}
}
}
/*
SFTPv4+ defines a 'newline' extension. SFTPv3 seems to have unofficial support for it via 'newline@vandyke.com',
however, I'm not sure what 'newline@vandyke.com' is supposed to do (the fact that it's unofficial means that it's
not in the official SFTPv3 specs) and 'newline@vandyke.com' / 'newline' are likely not drop-in substitutes for
one another due to the fact that 'newline' comes with a SSH_FXF_TEXT bitmask whereas it seems unlikely that
'newline@vandyke.com' would.
*/
/*
if (isset($this->extensions['newline@vandyke.com'])) {
$this->extensions['newline'] = $this->extensions['newline@vandyke.com'];
unset($this->extensions['newline@vandyke.com']);
}
*/
if ($this->version < 2 || $this->version > 6) {
return false;
}
$this->pwd = $this->_realpath('.');
$this->_update_stat_cache($this->pwd, array());
return true;
}
/**
* Disable the stat cache
*
* @access public
*/
function disableStatCache()
{
$this->use_stat_cache = false;
}
/**
* Enable the stat cache
*
* @access public
*/
function enableStatCache()
{
$this->use_stat_cache = true;
}
/**
* Clear the stat cache
*
* @access public
*/
function clearStatCache()
{
$this->stat_cache = array();
}
/**
* Enable path canonicalization
*
* @access public
*/
function enablePathCanonicalization()
{
$this->canonicalize_paths = true;
}
/**
* Enable path canonicalization
*
* @access public
*/
function disablePathCanonicalization()
{
$this->canonicalize_paths = false;
}
/**
* Enable arbitrary length packets
*
* @access public
*/
function enableArbitraryLengthPackets()
{
$this->allow_arbitrary_length_packets = true;
}
/**
* Disable arbitrary length packets
*
* @access public
*/
function disableArbitraryLengthPackets()
{
$this->allow_arbitrary_length_packets = false;
}
/**
* Returns the current directory name
*
* @return mixed
* @access public
*/
function pwd()
{
if (!$this->_precheck()) {
return false;
}
return $this->pwd;
}
/**
* Logs errors
*
* @param string $response
* @param int $status
* @access public
*/
function _logError($response, $status = -1)
{
if ($status == -1) {
if (strlen($response) < 4) {
return;
}
extract(unpack('Nstatus', $this->_string_shift($response, 4)));
}
$error = $this->status_codes[$status];
if ($this->version > 2 || strlen($response) < 4) {
extract(unpack('Nlength', $this->_string_shift($response, 4)));
$this->sftp_errors[] = $error . ': ' . $this->_string_shift($response, $length);
} else {
$this->sftp_errors[] = $error;
}
}
/**
* Returns canonicalized absolute pathname
*
* realpath() expands all symbolic links and resolves references to '/./', '/../' and extra '/' characters in the input
* path and returns the canonicalized absolute pathname.
*
* @param string $path
* @return mixed
* @access public
*/
function realpath($path)
{
if (!$this->_precheck()) {
return false;
}
return $this->_realpath($path);
}
/**
* Canonicalize the Server-Side Path Name
*
* SFTP doesn't provide a mechanism by which the current working directory can be changed, so we'll emulate it. Returns
* the absolute (canonicalized) path.
*
* If canonicalize_paths has been disabled using disablePathCanonicalization(), $path is returned as-is.
*
* @see self::chdir()
* @see self::disablePathCanonicalization()
* @param string $path
* @return mixed
* @access private
*/
function _realpath($path)
{
if (!$this->canonicalize_paths) {
return $path;
}
if ($this->pwd === false) {
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.9
if (!$this->_send_sftp_packet(NET_SFTP_REALPATH, pack('Na*', strlen($path), $path))) {
return false;
}
$response = $this->_get_sftp_packet();
switch ($this->packet_type) {
case NET_SFTP_NAME:
// although SSH_FXP_NAME is implemented differently in SFTPv3 than it is in SFTPv4+, the following
// should work on all SFTP versions since the only part of the SSH_FXP_NAME packet the following looks
// at is the first part and that part is defined the same in SFTP versions 3 through 6.
$this->_string_shift($response, 4); // skip over the count - it should be 1, anyway
if (strlen($response) < 4) {
return false;
}
extract(unpack('Nlength', $this->_string_shift($response, 4)));
return $this->_string_shift($response, $length);
case NET_SFTP_STATUS:
$this->_logError($response);
return false;
default:
user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
return false;
}
}
if (!strlen($path) || $path[0] != '/') {
$path = $this->pwd . '/' . $path;
}
$path = explode('/', $path);
$new = array();
foreach ($path as $dir) {
if (!strlen($dir)) {
continue;
}
switch ($dir) {
case '..':
array_pop($new);
case '.':
break;
default:
$new[] = $dir;
}
}
return '/' . implode('/', $new);
}
/**
* Changes the current directory
*
* @param string $dir
* @return bool
* @access public
*/
function chdir($dir)
{
if (!$this->_precheck()) {
return false;
}
// assume current dir if $dir is empty
if ($dir === '') {
$dir = './';
// suffix a slash if needed
} elseif ($dir[strlen($dir) - 1] != '/') {
$dir.= '/';
}
$dir = $this->_realpath($dir);
// confirm that $dir is, in fact, a valid directory
if ($this->use_stat_cache && is_array($this->_query_stat_cache($dir))) {
$this->pwd = $dir;
return true;
}
// we could do a stat on the alleged $dir to see if it's a directory but that doesn't tell us
// the currently logged in user has the appropriate permissions or not. maybe you could see if
// the file's uid / gid match the currently logged in user's uid / gid but how there's no easy
// way to get those with SFTP
if (!$this->_send_sftp_packet(NET_SFTP_OPENDIR, pack('Na*', strlen($dir), $dir))) {
return false;
}
// see \phpseclib\Net\SFTP::nlist() for a more thorough explanation of the following
$response = $this->_get_sftp_packet();
switch ($this->packet_type) {
case NET_SFTP_HANDLE:
$handle = substr($response, 4);
break;
case NET_SFTP_STATUS:
$this->_logError($response);
return false;
default:
user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
return false;
}
if (!$this->_close_handle($handle)) {
return false;
}
$this->_update_stat_cache($dir, array());
$this->pwd = $dir;
return true;
}
/**
* Returns a list of files in the given directory
*
* @param string $dir
* @param bool $recursive
* @return mixed
* @access public
*/
function nlist($dir = '.', $recursive = false)
{
return $this->_nlist_helper($dir, $recursive, '');