/usr/lib/python3/dist-packages/paramiko/sftp.py is in python3-paramiko 2.0.0-1ubuntu1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | # 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.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
import select
import socket
import struct
from paramiko import util
from paramiko.common import asbytes, DEBUG
from paramiko.message import Message
from paramiko.py3compat import byte_chr, byte_ord
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'
}
class SFTPError (Exception):
pass
class BaseSFTP (object):
def __init__(self):
self.logger = util.get_logger('paramiko.sftp')
self.sock = None
self.ultra_debug = False
### internals...
def _send_version(self):
self._send_packet(CMD_INIT, struct.pack('>I', _VERSION))
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):
#self._log(DEBUG2, 'write: %s (len=%d)' % (CMD_NAMES.get(t, '0x%02x' % t), len(packet)))
packet = asbytes(packet)
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])
#self._log(DEBUG2, 'read: %s (len=%d)' % (CMD_NAMES.get(t), '0x%02x' % t, len(data)-1))
return t, data[1:]
return 0, bytes()
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