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# Copyright (C) 2003-2007 Robey Pointer <robeypointer@gmail.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import select
import socket
import struct
from paramiko import util
from paramiko.common import DEBUG, byte_chr, byte_ord
from paramiko.message import Message
(
CMD_INIT,
CMD_VERSION,
CMD_OPEN,
CMD_CLOSE,
CMD_READ,
CMD_WRITE,
CMD_LSTAT,
CMD_FSTAT,
CMD_SETSTAT,
CMD_FSETSTAT,
CMD_OPENDIR,
CMD_READDIR,
CMD_REMOVE,
CMD_MKDIR,
CMD_RMDIR,
CMD_REALPATH,
CMD_STAT,
CMD_RENAME,
CMD_READLINK,
CMD_SYMLINK,
) = range(1, 21)
(CMD_STATUS, CMD_HANDLE, CMD_DATA, CMD_NAME, CMD_ATTRS) = range(101, 106)
(CMD_EXTENDED, CMD_EXTENDED_REPLY) = range(200, 202)
SFTP_OK = 0
(
SFTP_EOF,
SFTP_NO_SUCH_FILE,
SFTP_PERMISSION_DENIED,
SFTP_FAILURE,
SFTP_BAD_MESSAGE,
SFTP_NO_CONNECTION,
SFTP_CONNECTION_LOST,
SFTP_OP_UNSUPPORTED,
) = range(1, 9)
SFTP_DESC = [
"Success",
"End of file",
"No such file",
"Permission denied",
"Failure",
"Bad message",
"No connection",
"Connection lost",
"Operation unsupported",
]
SFTP_FLAG_READ = 0x1
SFTP_FLAG_WRITE = 0x2
SFTP_FLAG_APPEND = 0x4
SFTP_FLAG_CREATE = 0x8
SFTP_FLAG_TRUNC = 0x10
SFTP_FLAG_EXCL = 0x20
_VERSION = 3
# for debugging
CMD_NAMES = {
CMD_INIT: "init",
CMD_VERSION: "version",
CMD_OPEN: "open",
CMD_CLOSE: "close",
CMD_READ: "read",
CMD_WRITE: "write",
CMD_LSTAT: "lstat",
CMD_FSTAT: "fstat",
CMD_SETSTAT: "setstat",
CMD_FSETSTAT: "fsetstat",
CMD_OPENDIR: "opendir",
CMD_READDIR: "readdir",
CMD_REMOVE: "remove",
CMD_MKDIR: "mkdir",
CMD_RMDIR: "rmdir",
CMD_REALPATH: "realpath",
CMD_STAT: "stat",
CMD_RENAME: "rename",
CMD_READLINK: "readlink",
CMD_SYMLINK: "symlink",
CMD_STATUS: "status",
CMD_HANDLE: "handle",
CMD_DATA: "data",
CMD_NAME: "name",
CMD_ATTRS: "attrs",
CMD_EXTENDED: "extended",
CMD_EXTENDED_REPLY: "extended_reply",
}
# TODO: rewrite SFTP file/server modules' overly-flexible "make a request with
# xyz components" so we don't need this very silly method of signaling whether
# a given Python integer should be 32- or 64-bit.
# NOTE: this only became an issue when dropping Python 2 support; prior to
# doing so, we had to support actual-longs, which served as that signal. This
# is simply recreating that structure in a more tightly scoped fashion.
class int64(int):
pass
class SFTPError(Exception):
pass
class BaseSFTP:
def __init__(self):
self.logger = util.get_logger("paramiko.sftp")
self.sock = None
self.ultra_debug = False
# ...internals...
def _send_version(self):
m = Message()
m.add_int(_VERSION)
self._send_packet(CMD_INIT, m)
t, data = self._read_packet()
if t != CMD_VERSION:
raise SFTPError("Incompatible sftp protocol")
version = struct.unpack(">I", data[:4])[0]
# if version != _VERSION:
# raise SFTPError('Incompatible sftp protocol')
return version
def _send_server_version(self):
# winscp will freak out if the server sends version info before the
# client finishes sending INIT.
t, data = self._read_packet()
if t != CMD_INIT:
raise SFTPError("Incompatible sftp protocol")
version = struct.unpack(">I", data[:4])[0]
# advertise that we support "check-file"
extension_pairs = ["check-file", "md5,sha1"]
msg = Message()
msg.add_int(_VERSION)
msg.add(*extension_pairs)
self._send_packet(CMD_VERSION, msg)
return version
def _log(self, level, msg, *args):
self.logger.log(level, msg, *args)
def _write_all(self, out):
while len(out) > 0:
n = self.sock.send(out)
if n <= 0:
raise EOFError()
if n == len(out):
return
out = out[n:]
return
def _read_all(self, n):
out = bytes()
while n > 0:
if isinstance(self.sock, socket.socket):
# sometimes sftp is used directly over a socket instead of
# through a paramiko channel. in this case, check periodically
# if the socket is closed. (for some reason, recv() won't ever
# return or raise an exception, but calling select on a closed
# socket will.)
while True:
read, write, err = select.select([self.sock], [], [], 0.1)
if len(read) > 0:
x = self.sock.recv(n)
break
else:
x = self.sock.recv(n)
if len(x) == 0:
raise EOFError()
out += x
n -= len(x)
return out
def _send_packet(self, t, packet):
packet = packet.asbytes()
out = struct.pack(">I", len(packet) + 1) + byte_chr(t) + packet
if self.ultra_debug:
self._log(DEBUG, util.format_binary(out, "OUT: "))
self._write_all(out)
def _read_packet(self):
x = self._read_all(4)
# most sftp servers won't accept packets larger than about 32k, so
# anything with the high byte set (> 16MB) is just garbage.
if byte_ord(x[0]):
raise SFTPError("Garbage packet received")
size = struct.unpack(">I", x)[0]
data = self._read_all(size)
if self.ultra_debug:
self._log(DEBUG, util.format_binary(data, "IN: "))
if size > 0:
t = byte_ord(data[0])
return t, data[1:]
return 0, bytes()
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