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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';
*
* $sftp = new \phpseclib3\Net\SFTP('www.domain.tld');
* if (!$sftp->login('username', 'password')) {
* exit('Login Failed');
* }
*
* echo $sftp->pwd() . "\r\n";
* $sftp->put('filename.ext', 'hello, world!');
* print_r($sftp->nlist());
* ?>
* </code>
*
* @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 phpseclib3\Net;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Exception\FileNotFoundException;
/**
* Pure-PHP implementations of SFTP.
*
* @author Jim Wigginton <terrafrost@php.net>
*/
class SFTP extends SSH2
{
/**
* SFTP channel constant
*
* \phpseclib3\Net\SSH2::exec() uses 0 and \phpseclib3\Net\SSH2::read() / \phpseclib3\Net\SSH2::write() use 1.
*
* @see \phpseclib3\Net\SSH2::send_channel_packet()
* @see \phpseclib3\Net\SSH2::get_channel_packet()
*/
const CHANNEL = 0x100;
/**
* Reads data from a local file.
*
* @see \phpseclib3\Net\SFTP::put()
*/
const SOURCE_LOCAL_FILE = 1;
/**
* Reads data from a string.
*
* @see \phpseclib3\Net\SFTP::put()
*/
// 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
*
* @see \phpseclib3\Net\SFTP::put()
*/
const SOURCE_CALLBACK = 16;
/**
* Resumes an upload
*
* @see \phpseclib3\Net\SFTP::put()
*/
const RESUME = 4;
/**
* Append a local file to an already existing remote file
*
* @see \phpseclib3\Net\SFTP::put()
*/
const RESUME_START = 8;
/**
* Packet Types
*
* @see self::__construct()
* @var array
* @access private
*/
private static $packet_types = [];
/**
* Status Codes
*
* @see self::__construct()
* @var array
* @access private
*/
private static $status_codes = [];
/** @var array<int, string> */
private static $attributes;
/** @var array<int, string> */
private static $open_flags;
/** @var array<int, string> */
private static $open_flags5;
/** @var array<int, string> */
private static $file_types;
/**
* 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()
*/
private $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()
*/
private $packet_type = -1;
/**
* Packet Buffer
*
* @var string
* @see self::_get_sftp_packet()
*/
private $packet_buffer = '';
/**
* Extensions supported by the server
*
* @var array
* @see self::_initChannel()
*/
private $extensions = [];
/**
* Server SFTP version
*
* @var int
* @see self::_initChannel()
*/
private $version;
/**
* Default Server SFTP version
*
* @var int
* @see self::_initChannel()
*/
private $defaultVersion;
/**
* Preferred SFTP version
*
* @var int
* @see self::_initChannel()
*/
private $preferredVersion = 3;
/**
* Current working directory
*
* @var string|bool
* @see self::realpath()
* @see self::chdir()
*/
private $pwd = false;
/**
* Packet Type Log
*
* @see self::getLog()
* @var array
*/
private $packet_type_log = [];
/**
* Packet Log
*
* @see self::getLog()
* @var array
*/
private $packet_log = [];
/**
* Real-time log file pointer
*
* @see self::_append_log()
* @var resource|closed-resource
*/
private $realtime_log_file;
/**
* Real-time log file size
*
* @see self::_append_log()
* @var int
*/
private $realtime_log_size;
/**
* Real-time log file wrap boolean
*
* @see self::_append_log()
* @var bool
*/
private $realtime_log_wrap;
/**
* Current log size
*
* Should never exceed self::LOG_MAX_SIZE
*
* @var int
*/
private $log_size;
/**
* Error information
*
* @see self::getSFTPErrors()
* @see self::getLastSFTPError()
* @var array
*/
private $sftp_errors = [];
/**
* 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
*/
private $stat_cache = [];
/**
* Max SFTP Packet Size
*
* @see self::__construct()
* @see self::get()
* @var int
*/
private $max_sftp_packet;
/**
* Stat Cache Flag
*
* @see self::disableStatCache()
* @see self::enableStatCache()
* @var bool
*/
private $use_stat_cache = true;
/**
* Sort Options
*
* @see self::_comparator()
* @see self::setListOrder()
* @var array
*/
protected $sortOptions = [];
/**
* 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
*/
private $canonicalize_paths = true;
/**
* Request Buffers
*
* @see self::_get_sftp_packet()
* @var array
*/
private $requestBuffer = [];
/**
* Preserve timestamps on file downloads / uploads
*
* @see self::get()
* @see self::put()
* @var bool
*/
private $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
*/
private $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
*/
private $channel_close = false;
/**
* Has the SFTP channel been partially negotiated?
*
* @var bool
*/
private $partial_init = false;
/**
* Default Constructor.
*
* Connects to an SFTP server
*
* $host can either be a string, representing the host, or a stream resource.
*
* @param mixed $host
* @param int $port
* @param int $timeout
*/
public function __construct($host, $port = 22, $timeout = 10)
{
parent::__construct($host, $port, $timeout);
$this->max_sftp_packet = 1 << 15;
if (empty(self::$packet_types)) {
self::$packet_types = [
1 => 'NET_SFTP_INIT',
2 => 'NET_SFTP_VERSION',
3 => 'NET_SFTP_OPEN',
4 => 'NET_SFTP_CLOSE',
5 => 'NET_SFTP_READ',
6 => 'NET_SFTP_WRITE',
7 => 'NET_SFTP_LSTAT',
9 => 'NET_SFTP_SETSTAT',
10 => 'NET_SFTP_FSETSTAT',
11 => 'NET_SFTP_OPENDIR',
12 => 'NET_SFTP_READDIR',
13 => 'NET_SFTP_REMOVE',
14 => 'NET_SFTP_MKDIR',
15 => 'NET_SFTP_RMDIR',
16 => 'NET_SFTP_REALPATH',
17 => 'NET_SFTP_STAT',
18 => 'NET_SFTP_RENAME',
19 => 'NET_SFTP_READLINK',
20 => 'NET_SFTP_SYMLINK',
21 => 'NET_SFTP_LINK',
101 => 'NET_SFTP_STATUS',
102 => 'NET_SFTP_HANDLE',
103 => 'NET_SFTP_DATA',
104 => 'NET_SFTP_NAME',
105 => 'NET_SFTP_ATTRS',
200 => 'NET_SFTP_EXTENDED'
];
self::$status_codes = [
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 \phpseclib3\Net\SFTP::_parseAttributes() to understand why
self::$attributes = [
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.
(PHP_INT_SIZE == 4 ? (-1 << 31) : 0x80000000) => 'NET_SFTP_ATTR_EXTENDED'
];
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3
// the flag definitions change somewhat in SFTPv5+. if SFTPv5+ support is added to this library, maybe name
// the array for that $this->open5_flags and similarly alter the constant names.
self::$open_flags = [
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
self::$open_flags5 = [
// when SSH_FXF_ACCESS_DISPOSITION is a 3 bit field that controls how the file is opened
0x00000000 => 'NET_SFTP_OPEN_CREATE_NEW',
0x00000001 => 'NET_SFTP_OPEN_CREATE_TRUNCATE',
0x00000002 => 'NET_SFTP_OPEN_OPEN_EXISTING',
0x00000003 => 'NET_SFTP_OPEN_OPEN_OR_CREATE',
0x00000004 => 'NET_SFTP_OPEN_TRUNCATE_EXISTING',
// the rest of the flags are not supported
0x00000008 => 'NET_SFTP_OPEN_APPEND_DATA', // "the offset field of SS_FXP_WRITE requests is ignored"
0x00000010 => 'NET_SFTP_OPEN_APPEND_DATA_ATOMIC',
0x00000020 => 'NET_SFTP_OPEN_TEXT_MODE',
0x00000040 => 'NET_SFTP_OPEN_BLOCK_READ',
0x00000080 => 'NET_SFTP_OPEN_BLOCK_WRITE',
0x00000100 => 'NET_SFTP_OPEN_BLOCK_DELETE',
0x00000200 => 'NET_SFTP_OPEN_BLOCK_ADVISORY',
0x00000400 => 'NET_SFTP_OPEN_NOFOLLOW',
0x00000800 => 'NET_SFTP_OPEN_DELETE_ON_CLOSE',
0x00001000 => 'NET_SFTP_OPEN_ACCESS_AUDIT_ALARM_INFO',
0x00002000 => 'NET_SFTP_OPEN_ACCESS_BACKUP',
0x00004000 => 'NET_SFTP_OPEN_BACKUP_STREAM',
0x00008000 => 'NET_SFTP_OPEN_OVERRIDE_OWNER',
];
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2
// see \phpseclib3\Net\SFTP::_parseLongname() for an explanation
self::$file_types = [
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 following 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'
];
self::define_array(
self::$packet_types,
self::$status_codes,
self::$attributes,
self::$open_flags,
self::$open_flags5,
self::$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
*/
private 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
*
* @throws \UnexpectedValueException on receipt of unexpected packets
* @return bool
*/
private function partial_init_sftp_connection()
{
$response = $this->openChannel(self::CHANNEL, true);
if ($response === true && $this->isTimeout()) {
return false;
}
$packet = Strings::packSSH2(
'CNsbs',
NET_SSH2_MSG_CHANNEL_REQUEST,
$this->server_channels[self::CHANNEL],
'subsystem',
true,
'sftp'
);
$this->send_binary_packet($packet);
$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 = Strings::packSSH2(
'CNsCs',
NET_SSH2_MSG_CHANNEL_REQUEST,
$this->server_channels[self::CHANNEL],
'exec',
1,
$command
);
$this->send_binary_packet($packet);
$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;
$this->send_sftp_packet(NET_SFTP_INIT, "\0\0\0\3");
$response = $this->get_sftp_packet();
if ($this->packet_type != NET_SFTP_VERSION) {
throw new \UnexpectedValueException('Expected NET_SFTP_VERSION. '
. 'Got packet type: ' . $this->packet_type);
}
$this->use_request_id = true;
list($this->defaultVersion) = Strings::unpackSSH2('N', $response);
while (!empty($response)) {
list($key, $value) = Strings::unpackSSH2('ss', $response);
$this->extensions[$key] = $value;
}
$this->partial_init = true;
return true;
}
/**
* (Re)initializes the SFTP channel
*
* @return bool
*/
private function init_sftp_connection()
{
if (!$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 \phpseclib3\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']);
$supported = [6, 5, 4];
if ($this->preferredVersion) {
$supported = array_diff($supported, [$this->preferredVersion]);
array_unshift($supported, $this->preferredVersion);
}
foreach ($supported as $ver) {
if (in_array($ver, $versions)) {
if ($ver === $this->version) {
break;
}
$this->version = (int) $ver;
$packet = Strings::packSSH2('ss', 'version-select', "$ver");
$this->send_sftp_packet(NET_SFTP_EXTENDED, $packet);
$response = $this->get_sftp_packet();
if ($this->packet_type != NET_SFTP_STATUS) {
throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
. 'Got packet type: ' . $this->packet_type);
}
list($status) = Strings::unpackSSH2('N', $response);
if ($status != NET_SFTP_STATUS_OK) {
$this->logError($response, $status);
throw new \UnexpectedValueException('Expected NET_SFTP_STATUS_OK. '
. ' Got ' . $status);
}
break;
}
}
}
/*
SFTPv4+ defines a 'newline' extension. SFTPv3 seems to have unofficial support for it via 'newline@vandyke.com',
however, I'm not sure what 'newline@vandyke.com' is supposed to do (the fact that it's unofficial means that it's
not in the official SFTPv3 specs) and 'newline@vandyke.com' / 'newline' are likely not drop-in substitutes for
one another due to the fact that 'newline' comes with a SSH_FXF_TEXT bitmask whereas it seems unlikely that
'newline@vandyke.com' would.
*/
/*
if (isset($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 = true;
try {
$this->pwd = $this->realpath('.');
} catch (\UnexpectedValueException $e) {
if (!$this->canonicalize_paths) {
throw $e;
}
$this->canonicalize_paths = false;
$this->reset_connection(NET_SSH2_DISCONNECT_CONNECTION_LOST);
}
$this->update_stat_cache($this->pwd, []);
return true;
}
/**
* Disable the stat cache
*
*/
public function disableStatCache()
{
$this->use_stat_cache = false;
}
/**
* Enable the stat cache
*
*/
public function enableStatCache()
{
$this->use_stat_cache = true;
}
/**
* Clear the stat cache
*
*/
public function clearStatCache()
{
$this->stat_cache = [];
}
/**
* Enable path canonicalization
*
*/
public function enablePathCanonicalization()
{
$this->canonicalize_paths = true;
}
/**
* Disable path canonicalization
*
* If this is enabled then $sftp->pwd() will not return the canonicalized absolute path
*
*/
public function disablePathCanonicalization()
{
$this->canonicalize_paths = false;
}
/**
* Enable arbitrary length packets
*
*/
public function enableArbitraryLengthPackets()
{
$this->allow_arbitrary_length_packets = true;
}
/**
* Disable arbitrary length packets
*
*/
public function disableArbitraryLengthPackets()
{
$this->allow_arbitrary_length_packets = false;
}
/**
* Returns the current directory name
*
* @return string|bool
*/
public function pwd()
{
if (!$this->precheck()) {
return false;
}
return $this->pwd;
}
/**
* Logs errors
*
* @param string $response
* @param int $status
*/
private function logError($response, $status = -1)
{
if ($status == -1) {
list($status) = Strings::unpackSSH2('N', $response);
}
$error = self::$status_codes[$status];
if ($this->version > 2) {
list($message) = Strings::unpackSSH2('s', $response);
$this->sftp_errors[] = "$error: $message";
} else {
$this->sftp_errors[] = $error;
}
}
/**
* 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 $path
* @throws \UnexpectedValueException on receipt of unexpected packets
* @return mixed
*/
public function realpath($path)
{
if ($this->precheck() === false) {
return false;
}
if (!$this->canonicalize_paths) {
if ($this->pwd === true) {
return '.';
}
if (!strlen($path) || $path[0] != '/') {
$path = $this->pwd . '/' . $path;
}
$parts = explode('/', $path);
$afterPWD = $beforePWD = [];
foreach ($parts as $part) {
switch ($part) {
//case '': // some SFTP servers /require/ double /'s. see https://github.com/phpseclib/phpseclib/pull/1137
case '.':
break;
case '..':
if (!empty($afterPWD)) {
array_pop($afterPWD);
} else {
$beforePWD[] = '..';
}
break;
default:
$afterPWD[] = $part;
}
}
$beforePWD = count($beforePWD) ? implode('/', $beforePWD) : '.';
return $beforePWD . '/' . implode('/', $afterPWD);
}
if ($this->pwd === true) {
// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.9
$this->send_sftp_packet(NET_SFTP_REALPATH, Strings::packSSH2('s', $path));
$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.
list(, $filename) = Strings::unpackSSH2('Ns', $response);
return $filename;
case NET_SFTP_STATUS:
$this->logError($response);
return false;
default:
throw new \UnexpectedValueException('Expected NET_SFTP_NAME or NET_SFTP_STATUS. '
. 'Got packet type: ' . $this->packet_type);
}
}
if (!strlen($path) || $path[0] != '/') {
$path = $this->pwd . '/' . $path;
}
$path = explode('/', $path);
$new = [];
foreach ($path as $dir) {
if (!strlen($dir)) {
continue;
}
switch ($dir) {
case '..':
array_pop($new);
// fall-through
case '.':
break;
default:
$new[] = $dir;
}
}
return '/' . implode('/', $new);
}
/**
* Changes the current directory
*
* @param string $dir
* @throws \UnexpectedValueException on receipt of unexpected packets
* @return bool
*/
public function chdir($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
$this->send_sftp_packet(NET_SFTP_OPENDIR, Strings::packSSH2('s', $dir));
// see \phpseclib3\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:
throw new \UnexpectedValueException('Expected NET_SFTP_HANDLE or NET_SFTP_STATUS' .
'Got packet type: ' . $this->packet_type);
}
if (!$this->close_handle($handle)) {
return false;
}
$this->update_stat_cache($dir, []);
$this->pwd = $dir;
return true;
}
/**
* Returns a list of files in the given directory
*
* @param string $dir
* @param bool $recursive
* @return array|false
*/
public function nlist($dir = '.', $recursive = false)
{
return $this->nlist_helper($dir, $recursive, '');
}
/**
* Helper method for nlist
*
* @param string $dir
* @param bool $recursive
* @param string $relativeDir
* @return array|false
*/
private function nlist_helper($dir, $recursive, $relativeDir)
{
$files = $this->readlist($dir, false);
// If we get an int back, then that is an "unexpected" status.
// We do not have a file list, so return false.
if (is_int($files)) {
return false;
}