1
1
# Copyright (C) 2005 Robey Pointer <robey@lag.net>
2
2
# Copyright (C) 2005, 2006 Canonical Ltd
4
4
# This program is free software; you can redistribute it and/or modify
5
5
# it under the terms of the GNU General Public License as published by
6
6
# the Free Software Foundation; either version 2 of the License, or
7
7
# (at your option) any later version.
9
9
# This program is distributed in the hope that it will be useful,
10
10
# but WITHOUT ANY WARRANTY; without even the implied warranty of
11
11
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
12
# GNU General Public License for more details.
14
14
# You should have received a copy of the GNU General Public License
15
15
# along with this program; if not, write to the Free Software
16
16
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
18
"""Implementation of Transport over SFTP, using paramiko."""
20
# TODO: Remove the transport-based lock_read and lock_write methods. They'll
21
# then raise TransportNotPossible, which will break remote access to any
22
# formats which rely on OS-level locks. That should be fine as those formats
23
# are pretty old, but these combinations may have to be removed from the test
24
# suite. Those formats all date back to 0.7; so we should be able to remove
25
# these methods when we officially drop support for those formats.
33
from bzrlib.config import config_dir, ensure_config_dir_exists
34
from bzrlib.errors import (ConnectionError,
36
TransportNotPossible, NoSuchFile, PathNotChild,
43
from bzrlib.errors import (FileExists,
44
NoSuchFile, PathNotChild,
40
48
ParamikoNotPresent,
42
from bzrlib.osutils import pathjoin, fancy_rename
43
from bzrlib.trace import mutter, warning, error
50
from bzrlib.osutils import pathjoin, fancy_rename, getcwd
51
from bzrlib.trace import mutter, warning
44
52
from bzrlib.transport import (
45
53
register_urlparse_netloc_protocol,
60
67
CMD_HANDLE, CMD_OPEN)
61
68
from paramiko.sftp_attr import SFTPAttributes
62
69
from paramiko.sftp_file import SFTPFile
63
from paramiko.sftp_client import SFTPClient
66
72
register_urlparse_netloc_protocol('sftp')
70
# TODO: This should possibly ignore SIGHUP as well, but bzr currently
71
# doesn't handle it itself.
72
# <https://launchpad.net/products/bzr/+bug/41433/+index>
74
signal.signal(signal.SIGINT, signal.SIG_IGN)
77
def os_specific_subprocess_params():
78
"""Get O/S specific subprocess parameters."""
79
if sys.platform == 'win32':
80
# setting the process group and closing fds is not supported on
84
# We close fds other than the pipes as the child process does not need
87
# We also set the child process to ignore SIGINT. Normally the signal
88
# would be sent to every process in the foreground process group, but
89
# this causes it to be seen only by bzr and not by ssh. Python will
90
# generate a KeyboardInterrupt in bzr, and we will then have a chance
91
# to release locks or do other cleanup over ssh before the connection
93
# <https://launchpad.net/products/bzr/+bug/5987>
95
# Running it in a separate process group is not good because then it
96
# can't get non-echoed input of a password or passphrase.
97
# <https://launchpad.net/products/bzr/+bug/40508>
98
return {'preexec_fn': _ignore_sigint,
103
# don't use prefetch unless paramiko version >= 1.5.2 (there were bugs earlier)
104
_default_do_prefetch = False
105
if getattr(paramiko, '__version_info__', (0, 0, 0)) >= (1, 5, 5):
106
_default_do_prefetch = True
110
def _get_ssh_vendor():
111
"""Find out what version of SSH is on the system."""
113
if _ssh_vendor is not None:
118
if 'BZR_SSH' in os.environ:
119
_ssh_vendor = os.environ['BZR_SSH']
120
if _ssh_vendor == 'paramiko':
125
p = subprocess.Popen(['ssh', '-V'],
126
stdin=subprocess.PIPE,
127
stdout=subprocess.PIPE,
128
stderr=subprocess.PIPE,
129
**os_specific_subprocess_params())
130
returncode = p.returncode
131
stdout, stderr = p.communicate()
135
if 'OpenSSH' in stderr:
136
mutter('ssh implementation is OpenSSH')
137
_ssh_vendor = 'openssh'
138
elif 'SSH Secure Shell' in stderr:
139
mutter('ssh implementation is SSH Corp.')
142
if _ssh_vendor != 'none':
145
# XXX: 20051123 jamesh
146
# A check for putty's plink or lsh would go here.
148
mutter('falling back to paramiko implementation')
152
class SFTPSubprocess:
153
"""A socket-like object that talks to an ssh subprocess via pipes."""
154
def __init__(self, hostname, vendor, port=None, user=None):
155
assert vendor in ['openssh', 'ssh']
156
if vendor == 'openssh':
158
'-oForwardX11=no', '-oForwardAgent=no',
159
'-oClearAllForwardings=yes', '-oProtocol=2',
160
'-oNoHostAuthenticationForLocalhost=yes']
162
args.extend(['-p', str(port)])
164
args.extend(['-l', user])
165
args.extend(['-s', hostname, 'sftp'])
166
elif vendor == 'ssh':
169
args.extend(['-p', str(port)])
171
args.extend(['-l', user])
172
args.extend(['-s', 'sftp', hostname])
174
self.proc = subprocess.Popen(args,
175
stdin=subprocess.PIPE,
176
stdout=subprocess.PIPE,
177
**os_specific_subprocess_params())
179
def send(self, data):
180
return os.write(self.proc.stdin.fileno(), data)
182
def recv_ready(self):
183
# TODO: jam 20051215 this function is necessary to support the
184
# pipelined() function. In reality, it probably should use
185
# poll() or select() to actually return if there is data
186
# available, otherwise we probably don't get any benefit
189
def recv(self, count):
190
return os.read(self.proc.stdout.fileno(), count)
193
self.proc.stdin.close()
194
self.proc.stdout.close()
198
class LoopbackSFTP(object):
199
"""Simple wrapper for a socket that pretends to be a paramiko Channel."""
201
def __init__(self, sock):
204
def send(self, data):
205
return self.__socket.send(data)
208
return self.__socket.recv(n)
210
def recv_ready(self):
214
self.__socket.close()
220
75
# This is a weakref dictionary, so that we can reuse connections
221
76
# that are still active. Long term, it might be nice to have some
222
77
# sort of expiration policy, such as disconnect if inactive for
223
78
# X seconds. But that requires a lot more fanciness.
224
79
_connected_hosts = weakref.WeakValueDictionary()
82
_paramiko_version = getattr(paramiko, '__version_info__', (0, 0, 0))
83
# don't use prefetch unless paramiko version >= 1.5.5 (there were bugs earlier)
84
_default_do_prefetch = (_paramiko_version >= (1, 5, 5))
226
87
def clear_connection_cache():
227
88
"""Remove all hosts from the SFTP connection cache.
231
92
_connected_hosts.clear()
234
def load_host_keys():
236
Load system host keys (probably doesn't work on windows) and any
237
"discovered" keys from previous sessions.
239
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
241
SYSTEM_HOSTKEYS = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
243
mutter('failed to load system host keys: ' + str(e))
244
bzr_hostkey_path = pathjoin(config_dir(), 'ssh_host_keys')
246
BZR_HOSTKEYS = paramiko.util.load_host_keys(bzr_hostkey_path)
248
mutter('failed to load bzr host keys: ' + str(e))
252
def save_host_keys():
254
Save "discovered" host keys in $(config)/ssh_host_keys/.
256
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
257
bzr_hostkey_path = pathjoin(config_dir(), 'ssh_host_keys')
258
ensure_config_dir_exists()
261
f = open(bzr_hostkey_path, 'w')
262
f.write('# SSH host keys collected by bzr\n')
263
for hostname, keys in BZR_HOSTKEYS.iteritems():
264
for keytype, key in keys.iteritems():
265
f.write('%s %s %s\n' % (hostname, keytype, key.get_base64()))
268
mutter('failed to save bzr host keys: ' + str(e))
271
95
class SFTPLock(object):
272
"""This fakes a lock in a remote location."""
96
"""This fakes a lock in a remote location.
98
A present lock is indicated just by the existence of a file. This
99
doesn't work well on all transports and they are only used in
100
deprecated storage formats.
273
103
__slots__ = ['path', 'lock_path', 'lock_file', 'transport']
274
105
def __init__(self, path, transport):
275
106
assert isinstance(transport, SFTPTransport)
302
133
# What specific errors should we catch here?
305
class SFTPTransport (Transport):
307
Transport implementation for SFTP access.
309
_do_prefetch = _default_do_prefetch
311
def __init__(self, base, clone_from=None):
312
assert base.startswith('sftp://')
137
class SFTPUrlHandling(Transport):
138
"""Mix-in that does common handling of SSH/SFTP URLs."""
140
def __init__(self, base):
313
141
self._parse_url(base)
314
base = self._unparse_url()
142
base = self._unparse_url(self._path)
315
143
if base[-1] != '/':
145
super(SFTPUrlHandling, self).__init__(base)
147
def _parse_url(self, url):
149
self._username, self._password,
150
self._host, self._port, self._path) = self._split_url(url)
152
def _unparse_url(self, path):
153
"""Return a URL for a path relative to this transport.
155
path = urllib.quote(path)
156
# handle homedir paths
157
if not path.startswith('/'):
159
netloc = urllib.quote(self._host)
160
if self._username is not None:
161
netloc = '%s@%s' % (urllib.quote(self._username), netloc)
162
if self._port is not None:
163
netloc = '%s:%d' % (netloc, self._port)
164
return urlparse.urlunparse((self._scheme, netloc, path, '', '', ''))
166
def _split_url(self, url):
167
(scheme, username, password, host, port, path) = split_url(url)
168
## assert scheme == 'sftp'
170
# the initial slash should be removed from the path, and treated
171
# as a homedir relative path (the path begins with a double slash
172
# if it is absolute).
173
# see draft-ietf-secsh-scp-sftp-ssh-uri-03.txt
174
# RBC 20060118 we are not using this as its too user hostile. instead
175
# we are following lftp and using /~/foo to mean '~/foo'.
176
# handle homedir paths
177
if path.startswith('/~/'):
181
return (scheme, username, password, host, port, path)
183
def abspath(self, relpath):
184
"""Return the full url to the given relative path.
186
@param relpath: the relative path or path components
187
@type relpath: str or list
189
return self._unparse_url(self._remote_path(relpath))
191
def _remote_path(self, relpath):
192
"""Return the path to be passed along the sftp protocol for relpath.
194
:param relpath: is a urlencoded string.
196
return self._combine_paths(self._path, relpath)
199
class SFTPTransport(SFTPUrlHandling):
200
"""Transport implementation for SFTP access."""
202
_do_prefetch = _default_do_prefetch
203
# TODO: jam 20060717 Conceivably these could be configurable, either
204
# by auto-tuning at run-time, or by a configuration (per host??)
205
# but the performance curve is pretty flat, so just going with
206
# reasonable defaults.
207
_max_readv_combine = 200
208
# Having to round trip to the server means waiting for a response,
209
# so it is better to download extra bytes.
210
# 8KiB had good performance for both local and remote network operations
211
_bytes_to_read_before_seek = 8192
213
# The sftp spec says that implementations SHOULD allow reads
214
# to be at least 32K. paramiko.readv() does an async request
215
# for the chunks. So we need to keep it within a single request
216
# size for paramiko <= 1.6.1. paramiko 1.6.2 will probably chop
217
# up the request itself, rather than us having to worry about it
218
_max_request_size = 32768
220
def __init__(self, base, clone_from=None):
317
221
super(SFTPTransport, self).__init__(base)
318
222
if clone_from is None:
319
223
self._sftp_connect()
340
244
return SFTPTransport(self.abspath(offset), self)
342
def abspath(self, relpath):
344
Return the full url to the given relative path.
346
@param relpath: the relative path or path components
347
@type relpath: str or list
349
return self._unparse_url(self._remote_path(relpath))
351
246
def _remote_path(self, relpath):
352
247
"""Return the path to be passed along the sftp protocol for relpath.
354
249
relpath is a urlencoded string.
251
:return: a path prefixed with / for regular abspath-based urls, or a
252
path that does not begin with / for urls which begin with /~/.
356
# FIXME: share the common code across transports
254
# how does this work?
255
# it processes relpath with respect to
257
# firstly we create a path to evaluate:
258
# if relpath is an abspath or homedir path, its the entire thing
259
# otherwise we join our base with relpath
260
# then we eliminate all empty segments (double //'s) outside the first
261
# two elements of the list. This avoids problems with trailing
262
# slashes, or other abnormalities.
263
# finally we evaluate the entire path in a single pass
265
# '..' result in popping the left most already
266
# processed path (which can never be empty because of the check for
267
# abspath and homedir meaning that its not, or that we've used our
268
# path. If the pop would pop the root, we ignore it.
270
# Specific case examinations:
271
# remove the special casefor ~: if the current root is ~/ popping of it
272
# = / thus our seed for a ~ based path is ['', '~']
273
# and if we end up with [''] then we had basically ('', '..') (which is
274
# '/..' so we append '' if the length is one, and assert that the first
275
# element is still ''. Lastly, if we end with ['', '~'] as a prefix for
276
# the output, we've got a homedir path, so we strip that prefix before
277
# '/' joining the resulting list.
279
# case one: '/' -> ['', ''] cannot shrink
280
# case two: '/' + '../foo' -> ['', 'foo'] (take '', '', '..', 'foo')
281
# and pop the second '' for the '..', append 'foo'
282
# case three: '/~/' -> ['', '~', '']
283
# case four: '/~/' + '../foo' -> ['', '~', '', '..', 'foo'],
284
# and we want to get '/foo' - the empty path in the middle
285
# needs to be stripped, then normal path manipulation will
287
# case five: '/..' ['', '..'], we want ['', '']
288
# stripping '' outside the first two is ok
289
# ignore .. if its too high up
291
# lastly this code is possibly reusable by FTP, but not reusable by
292
# local paths: ~ is resolvable correctly, nor by HTTP or the smart
293
# server: ~ is resolved remotely.
295
# however, a version of this that acts on self.base is possible to be
296
# written which manipulates the URL in canonical form, and would be
297
# reusable for all transports, if a flag for allowing ~/ at all was
357
299
assert isinstance(relpath, basestring)
358
relpath = urllib.unquote(relpath).split('/')
359
basepath = self._path.split('/')
360
if len(basepath) > 0 and basepath[-1] == '':
361
basepath = basepath[:-1]
365
if len(basepath) == 0:
366
# In most filesystems, a request for the parent
367
# of root, just returns root.
375
path = '/'.join(basepath)
300
relpath = urlutils.unescape(relpath)
303
if relpath.startswith('/'):
304
# abspath - normal split is fine.
305
current_path = relpath.split('/')
306
elif relpath.startswith('~/'):
307
# root is homedir based: normal split and prefix '' to remote the
309
current_path = [''].extend(relpath.split('/'))
311
# root is from the current directory:
312
if self._path.startswith('/'):
313
# abspath, take the regular split
316
# homedir based, add the '', '~' not present in self._path
317
current_path = ['', '~']
318
# add our current dir
319
current_path.extend(self._path.split('/'))
320
# add the users relpath
321
current_path.extend(relpath.split('/'))
322
# strip '' segments that are not in the first one - the leading /.
323
to_process = current_path[:1]
324
for segment in current_path[1:]:
326
to_process.append(segment)
328
# process '.' and '..' segments into output_path.
330
for segment in to_process:
332
# directory pop. Remove a directory
333
# as long as we are not at the root
334
if len(output_path) > 1:
337
# cannot pop beyond the root, so do nothing
339
continue # strip the '.' from the output.
341
# this will append '' to output_path for the root elements,
342
# which is appropriate: its why we strip '' in the first pass.
343
output_path.append(segment)
345
# check output special cases:
346
if output_path == ['']:
348
output_path = ['', '']
349
elif output_path[:2] == ['', '~']:
350
# ['', '~', ...] -> ...
351
output_path = output_path[2:]
352
path = '/'.join(output_path)
378
355
def relpath(self, abspath):
379
username, password, host, port, path = self._split_url(abspath)
356
scheme, username, password, host, port, path = self._split_url(abspath)
381
358
if (username != self._username):
382
359
error.append('username mismatch')
417
394
except (IOError, paramiko.SSHException), e:
418
395
self._translate_io_exception(e, path, ': error retrieving')
420
def get_partial(self, relpath, start, length=None):
422
Get just part of a file.
424
:param relpath: Path to the file, relative to base
425
:param start: The starting position to read from
426
:param length: The length to read. A length of None indicates
427
read to the end of the file.
428
:return: A file-like object containing at least the specified bytes.
429
Some implementations may return objects which can be read
430
past this length, but this is not guaranteed.
432
# TODO: implement get_partial_multi to help with knit support
433
f = self.get(relpath)
435
if self._do_prefetch and hasattr(f, 'prefetch'):
439
def put(self, relpath, f, mode=None):
441
Copy the file-like or string object into the location.
397
def readv(self, relpath, offsets):
398
"""See Transport.readv()"""
399
# We overload the default readv() because we want to use a file
400
# that does not have prefetch enabled.
401
# Also, if we have a new paramiko, it implements an async readv()
406
path = self._remote_path(relpath)
407
fp = self._sftp.file(path, mode='rb')
408
readv = getattr(fp, 'readv', None)
410
return self._sftp_readv(fp, offsets, relpath)
411
mutter('seek and read %s offsets', len(offsets))
412
return self._seek_and_read(fp, offsets, relpath)
413
except (IOError, paramiko.SSHException), e:
414
self._translate_io_exception(e, path, ': error retrieving')
416
def _sftp_readv(self, fp, offsets, relpath='<unknown>'):
417
"""Use the readv() member of fp to do async readv.
419
And then read them using paramiko.readv(). paramiko.readv()
420
does not support ranges > 64K, so it caps the request size, and
421
just reads until it gets all the stuff it wants
423
offsets = list(offsets)
424
sorted_offsets = sorted(offsets)
426
# The algorithm works as follows:
427
# 1) Coalesce nearby reads into a single chunk
428
# This generates a list of combined regions, the total size
429
# and the size of the sub regions. This coalescing step is limited
430
# in the number of nearby chunks to combine, and is allowed to
431
# skip small breaks in the requests. Limiting it makes sure that
432
# we can start yielding some data earlier, and skipping means we
433
# make fewer requests. (Beneficial even when using async)
434
# 2) Break up this combined regions into chunks that are smaller
435
# than 64KiB. Technically the limit is 65536, but we are a
436
# little bit conservative. This is because sftp has a maximum
437
# return chunk size of 64KiB (max size of an unsigned short)
438
# 3) Issue a readv() to paramiko to create an async request for
440
# 4) Read in the data as it comes back, until we've read one
441
# continuous section as determined in step 1
442
# 5) Break up the full sections into hunks for the original requested
443
# offsets. And put them in a cache
444
# 6) Check if the next request is in the cache, and if it is, remove
445
# it from the cache, and yield its data. Continue until no more
446
# entries are in the cache.
447
# 7) loop back to step 4 until all data has been read
449
# TODO: jam 20060725 This could be optimized one step further, by
450
# attempting to yield whatever data we have read, even before
451
# the first coallesced section has been fully processed.
453
# When coalescing for use with readv(), we don't really need to
454
# use any fudge factor, because the requests are made asynchronously
455
coalesced = list(self._coalesce_offsets(sorted_offsets,
456
limit=self._max_readv_combine,
460
for c_offset in coalesced:
461
start = c_offset.start
462
size = c_offset.length
464
# We need to break this up into multiple requests
466
next_size = min(size, self._max_request_size)
467
requests.append((start, next_size))
471
mutter('SFTP.readv() %s offsets => %s coalesced => %s requests',
472
len(offsets), len(coalesced), len(requests))
474
# Queue the current read until we have read the full coalesced section
477
cur_coalesced_stack = iter(coalesced)
478
cur_coalesced = cur_coalesced_stack.next()
480
# Cache the results, but only until they have been fulfilled
482
# turn the list of offsets into a stack
483
offset_stack = iter(offsets)
484
cur_offset_and_size = offset_stack.next()
486
for data in fp.readv(requests):
488
cur_data_len += len(data)
490
if cur_data_len < cur_coalesced.length:
492
assert cur_data_len == cur_coalesced.length, \
493
"Somehow we read too much: %s != %s" % (cur_data_len,
494
cur_coalesced.length)
495
all_data = ''.join(cur_data)
499
for suboffset, subsize in cur_coalesced.ranges:
500
key = (cur_coalesced.start+suboffset, subsize)
501
data_map[key] = all_data[suboffset:suboffset+subsize]
503
# Now that we've read some data, see if we can yield anything back
504
while cur_offset_and_size in data_map:
505
this_data = data_map.pop(cur_offset_and_size)
506
yield cur_offset_and_size[0], this_data
507
cur_offset_and_size = offset_stack.next()
509
# We read a coalesced entry, so mark it as done
511
# Now that we've read all of the data for this coalesced section
513
cur_coalesced = cur_coalesced_stack.next()
515
if cur_coalesced is not None:
516
raise errors.ShortReadvError(relpath, cur_coalesced.start,
517
cur_coalesced.length, len(data))
519
def put_file(self, relpath, f, mode=None):
521
Copy the file-like object into the location.
443
523
:param relpath: Location to put the contents, relative to base.
444
:param f: File-like or string object.
524
:param f: File-like object.
445
525
:param mode: The final mode for the file
447
527
final_path = self._remote_path(relpath)
482
575
# raise the original with its traceback if we can.
578
def _put_non_atomic_helper(self, relpath, writer, mode=None,
579
create_parent_dir=False,
581
abspath = self._remote_path(relpath)
583
# TODO: jam 20060816 paramiko doesn't publicly expose a way to
584
# set the file mode at create time. If it does, use it.
585
# But for now, we just chmod later anyway.
587
def _open_and_write_file():
588
"""Try to open the target file, raise error on failure"""
592
fout = self._sftp.file(abspath, mode='wb')
593
fout.set_pipelined(True)
595
except (paramiko.SSHException, IOError), e:
596
self._translate_io_exception(e, abspath,
599
# This is designed to chmod() right before we close.
600
# Because we set_pipelined() earlier, theoretically we might
601
# avoid the round trip for fout.close()
603
self._sftp.chmod(abspath, mode)
608
if not create_parent_dir:
609
_open_and_write_file()
612
# Try error handling to create the parent directory if we need to
614
_open_and_write_file()
616
# Try to create the parent directory, and then go back to
618
parent_dir = os.path.dirname(abspath)
619
self._mkdir(parent_dir, dir_mode)
620
_open_and_write_file()
622
def put_file_non_atomic(self, relpath, f, mode=None,
623
create_parent_dir=False,
625
"""Copy the file-like object into the target location.
627
This function is not strictly safe to use. It is only meant to
628
be used when you already know that the target does not exist.
629
It is not safe, because it will open and truncate the remote
630
file. So there may be a time when the file has invalid contents.
632
:param relpath: The remote location to put the contents.
633
:param f: File-like object.
634
:param mode: Possible access permissions for new file.
635
None means do not set remote permissions.
636
:param create_parent_dir: If we cannot create the target file because
637
the parent directory does not exist, go ahead and
638
create it, and then try again.
642
self._put_non_atomic_helper(relpath, writer, mode=mode,
643
create_parent_dir=create_parent_dir,
646
def put_bytes_non_atomic(self, relpath, bytes, mode=None,
647
create_parent_dir=False,
651
self._put_non_atomic_helper(relpath, writer, mode=mode,
652
create_parent_dir=create_parent_dir,
485
655
def iter_files_recursive(self):
486
656
"""Walk the relative paths of all files in this transport."""
487
657
queue = list(self.list_dir('.'))
489
relpath = urllib.quote(queue.pop(0))
659
relpath = queue.pop(0)
490
660
st = self.stat(relpath)
491
661
if stat.S_ISDIR(st.st_mode):
492
662
for i, basename in enumerate(self.list_dir(relpath)):
667
def _mkdir(self, abspath, mode=None):
673
self._sftp.mkdir(abspath, local_mode)
675
self._sftp.chmod(abspath, mode=mode)
676
except (paramiko.SSHException, IOError), e:
677
self._translate_io_exception(e, abspath, ': unable to mkdir',
678
failure_exc=FileExists)
497
680
def mkdir(self, relpath, mode=None):
498
681
"""Create a directory at the given path."""
500
path = self._remote_path(relpath)
501
# In the paramiko documentation, it says that passing a mode flag
502
# will filtered against the server umask.
503
# StubSFTPServer does not do this, which would be nice, because it is
504
# what we really want :)
505
# However, real servers do use umask, so we really should do it that way
506
self._sftp.mkdir(path)
508
self._sftp.chmod(path, mode=mode)
509
except (paramiko.SSHException, IOError), e:
510
self._translate_io_exception(e, path, ': unable to mkdir',
511
failure_exc=FileExists)
682
self._mkdir(self._remote_path(relpath), mode=mode)
513
684
def _translate_io_exception(self, e, path, more_info='',
514
685
failure_exc=PathError):
648
823
# that we have taken the lock.
649
824
return SFTPLock(relpath, self)
651
def _unparse_url(self, path=None):
654
path = urllib.quote(path)
655
# handle homedir paths
656
if not path.startswith('/'):
658
netloc = urllib.quote(self._host)
659
if self._username is not None:
660
netloc = '%s@%s' % (urllib.quote(self._username), netloc)
661
if self._port is not None:
662
netloc = '%s:%d' % (netloc, self._port)
663
return urlparse.urlunparse(('sftp', netloc, path, '', '', ''))
665
def _split_url(self, url):
666
(scheme, username, password, host, port, path) = split_url(url)
667
assert scheme == 'sftp'
669
# the initial slash should be removed from the path, and treated
670
# as a homedir relative path (the path begins with a double slash
671
# if it is absolute).
672
# see draft-ietf-secsh-scp-sftp-ssh-uri-03.txt
673
# RBC 20060118 we are not using this as its too user hostile. instead
674
# we are following lftp and using /~/foo to mean '~/foo'.
675
# handle homedir paths
676
if path.startswith('/~/'):
680
return (username, password, host, port, path)
682
def _parse_url(self, url):
683
(self._username, self._password,
684
self._host, self._port, self._path) = self._split_url(url)
686
826
def _sftp_connect(self):
687
827
"""Connect to the remote sftp server.
688
828
After this, self._sftp should have a valid connection (or
691
831
TODO: Raise a more reasonable ConnectionFailed exception
693
global _connected_hosts
695
idx = (self._host, self._port, self._username)
697
self._sftp = _connected_hosts[idx]
702
vendor = _get_ssh_vendor()
703
if vendor == 'loopback':
704
sock = socket.socket()
705
sock.connect((self._host, self._port))
706
self._sftp = SFTPClient(LoopbackSFTP(sock))
707
elif vendor != 'none':
708
sock = SFTPSubprocess(self._host, vendor, self._port,
710
self._sftp = SFTPClient(sock)
712
self._paramiko_connect()
714
_connected_hosts[idx] = self._sftp
716
def _paramiko_connect(self):
717
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
722
t = paramiko.Transport((self._host, self._port or 22))
723
t.set_log_channel('bzr.paramiko')
725
except paramiko.SSHException, e:
726
raise ConnectionError('Unable to reach SSH host %s:%d' %
727
(self._host, self._port), e)
729
server_key = t.get_remote_server_key()
730
server_key_hex = paramiko.util.hexify(server_key.get_fingerprint())
731
keytype = server_key.get_name()
732
if SYSTEM_HOSTKEYS.has_key(self._host) and SYSTEM_HOSTKEYS[self._host].has_key(keytype):
733
our_server_key = SYSTEM_HOSTKEYS[self._host][keytype]
734
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
735
elif BZR_HOSTKEYS.has_key(self._host) and BZR_HOSTKEYS[self._host].has_key(keytype):
736
our_server_key = BZR_HOSTKEYS[self._host][keytype]
737
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
739
warning('Adding %s host key for %s: %s' % (keytype, self._host, server_key_hex))
740
if not BZR_HOSTKEYS.has_key(self._host):
741
BZR_HOSTKEYS[self._host] = {}
742
BZR_HOSTKEYS[self._host][keytype] = server_key
743
our_server_key = server_key
744
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
746
if server_key != our_server_key:
747
filename1 = os.path.expanduser('~/.ssh/known_hosts')
748
filename2 = pathjoin(config_dir(), 'ssh_host_keys')
749
raise TransportError('Host keys for %s do not match! %s != %s' % \
750
(self._host, our_server_key_hex, server_key_hex),
751
['Try editing %s or %s' % (filename1, filename2)])
756
self._sftp = t.open_sftp_client()
757
except paramiko.SSHException, e:
758
raise ConnectionError('Unable to start sftp client %s:%d' %
759
(self._host, self._port), e)
761
def _sftp_auth(self, transport):
762
# paramiko requires a username, but it might be none if nothing was supplied
763
# use the local username, just in case.
764
# We don't override self._username, because if we aren't using paramiko,
765
# the username might be specified in ~/.ssh/config and we don't want to
766
# force it to something else
767
# Also, it would mess up the self.relpath() functionality
768
username = self._username or getpass.getuser()
770
# Paramiko tries to open a socket.AF_UNIX in order to connect
771
# to ssh-agent. That attribute doesn't exist on win32 (it does in cygwin)
772
# so we get an AttributeError exception. For now, just don't try to
773
# connect to an agent if we are on win32
774
if sys.platform != 'win32':
775
agent = paramiko.Agent()
776
for key in agent.get_keys():
777
mutter('Trying SSH agent key %s' % paramiko.util.hexify(key.get_fingerprint()))
779
transport.auth_publickey(username, key)
781
except paramiko.SSHException, e:
784
# okay, try finding id_rsa or id_dss? (posix only)
785
if self._try_pkey_auth(transport, paramiko.RSAKey, username, 'id_rsa'):
787
if self._try_pkey_auth(transport, paramiko.DSSKey, username, 'id_dsa'):
792
transport.auth_password(username, self._password)
794
except paramiko.SSHException, e:
797
# FIXME: Don't keep a password held in memory if you can help it
798
#self._password = None
800
# give up and ask for a password
801
password = bzrlib.ui.ui_factory.get_password(
802
prompt='SSH %(user)s@%(host)s password',
803
user=username, host=self._host)
805
transport.auth_password(username, password)
806
except paramiko.SSHException, e:
807
raise ConnectionError('Unable to authenticate to SSH host as %s@%s' %
808
(username, self._host), e)
810
def _try_pkey_auth(self, transport, pkey_class, username, filename):
811
filename = os.path.expanduser('~/.ssh/' + filename)
813
key = pkey_class.from_private_key_file(filename)
814
transport.auth_publickey(username, key)
816
except paramiko.PasswordRequiredException:
817
password = bzrlib.ui.ui_factory.get_password(
818
prompt='SSH %(filename)s password',
821
key = pkey_class.from_private_key_file(filename, password)
822
transport.auth_publickey(username, key)
824
except paramiko.SSHException:
825
mutter('SSH authentication via %s key failed.' % (os.path.basename(filename),))
826
except paramiko.SSHException:
827
mutter('SSH authentication via %s key failed.' % (os.path.basename(filename),))
833
self._sftp = _sftp_connect(self._host, self._port, self._username,
832
836
def _sftp_open_exclusive(self, abspath, mode=None):
833
837
"""Open a remote path exclusively.
895
909
self._socket.bind(('localhost', 0))
896
910
self._socket.listen(1)
897
911
self.port = self._socket.getsockname()[1]
898
self.stop_event = threading.Event()
901
s, _ = self._socket.accept()
902
# now close the listen socket
905
self._callback(s, self.stop_event)
907
pass #Ignore socket errors
909
# probably a failed test
910
warning('Exception from within unit test server thread: %r' % x)
912
self._stop_event = threading.Event()
913
self.stop_event.set()
915
# called from outside this thread
916
self._stop_event.set()
914
917
# use a timeout here, because if the test fails, the server thread may
915
918
# never notice the stop_event.
924
readable, writable_unused, exception_unused = \
925
select.select([self._socket], [], [], 0.1)
926
if self._stop_event.isSet():
928
if len(readable) == 0:
931
s, addr_unused = self._socket.accept()
932
# because the loopback socket is inline, and transports are
933
# never explicitly closed, best to launch a new thread.
934
threading.Thread(target=self._callback, args=(s,)).start()
935
except socket.error, x:
936
sys.excepthook(*sys.exc_info())
937
warning('Socket error during accept() within unit test server'
940
# probably a failed test; unit test thread will log the
942
sys.excepthook(*sys.exc_info())
943
warning('Exception from within unit test server thread: %r' %
947
class SocketDelay(object):
948
"""A socket decorator to make TCP appear slower.
950
This changes recv, send, and sendall to add a fixed latency to each python
951
call if a new roundtrip is detected. That is, when a recv is called and the
952
flag new_roundtrip is set, latency is charged. Every send and send_all
955
In addition every send, sendall and recv sleeps a bit per character send to
958
Not all methods are implemented, this is deliberate as this class is not a
959
replacement for the builtin sockets layer. fileno is not implemented to
960
prevent the proxy being bypassed.
964
_proxied_arguments = dict.fromkeys([
965
"close", "getpeername", "getsockname", "getsockopt", "gettimeout",
966
"setblocking", "setsockopt", "settimeout", "shutdown"])
968
def __init__(self, sock, latency, bandwidth=1.0,
971
:param bandwith: simulated bandwith (MegaBit)
972
:param really_sleep: If set to false, the SocketDelay will just
973
increase a counter, instead of calling time.sleep. This is useful for
974
unittesting the SocketDelay.
977
self.latency = latency
978
self.really_sleep = really_sleep
979
self.time_per_byte = 1 / (bandwidth / 8.0 * 1024 * 1024)
980
self.new_roundtrip = False
983
if self.really_sleep:
986
SocketDelay.simulated_time += s
988
def __getattr__(self, attr):
989
if attr in SocketDelay._proxied_arguments:
990
return getattr(self.sock, attr)
991
raise AttributeError("'SocketDelay' object has no attribute %r" %
995
return SocketDelay(self.sock.dup(), self.latency, self.time_per_byte,
998
def recv(self, *args):
999
data = self.sock.recv(*args)
1000
if data and self.new_roundtrip:
1001
self.new_roundtrip = False
1002
self.sleep(self.latency)
1003
self.sleep(len(data) * self.time_per_byte)
1006
def sendall(self, data, flags=0):
1007
if not self.new_roundtrip:
1008
self.new_roundtrip = True
1009
self.sleep(self.latency)
1010
self.sleep(len(data) * self.time_per_byte)
1011
return self.sock.sendall(data, flags)
1013
def send(self, data, flags=0):
1014
if not self.new_roundtrip:
1015
self.new_roundtrip = True
1016
self.sleep(self.latency)
1017
bytes_sent = self.sock.send(data, flags)
1018
self.sleep(bytes_sent * self.time_per_byte)
919
1022
class SFTPServer(Server):
920
1023
"""Common code for SFTP server facilities."""
1025
def __init__(self, server_interface=StubServer):
923
1026
self._original_vendor = None
924
1027
self._homedir = None
925
1028
self._server_homedir = None
926
1029
self._listener = None
927
1030
self._root = None
928
self._vendor = 'none'
1031
self._vendor = ssh.ParamikoVendor()
1032
self._server_interface = server_interface
929
1033
# sftp server logs
1035
self.add_latency = 0
932
1037
def _get_sftp_url(self, path):
933
1038
"""Calculate an sftp url to this server for path."""
937
1042
"""StubServer uses this to log when a new server is created."""
938
1043
self.logs.append(message)
940
def _run_server(self, s, stop_event):
1045
def _run_server_entry(self, sock):
1046
"""Entry point for all implementations of _run_server.
1048
If self.add_latency is > 0.000001 then sock is given a latency adding
1051
if self.add_latency > 0.000001:
1052
sock = SocketDelay(sock, self.add_latency)
1053
return self._run_server(sock)
1055
def _run_server(self, s):
941
1056
ssh_server = paramiko.Transport(s)
942
key_file = os.path.join(self._homedir, 'test_rsa.key')
943
file(key_file, 'w').write(STUB_SERVER_KEY)
1057
key_file = pathjoin(self._homedir, 'test_rsa.key')
1058
f = open(key_file, 'w')
1059
f.write(STUB_SERVER_KEY)
944
1061
host_key = paramiko.RSAKey.from_private_key_file(key_file)
945
1062
ssh_server.add_server_key(host_key)
946
server = StubServer(self)
1063
server = self._server_interface(self)
947
1064
ssh_server.set_subsystem_handler('sftp', paramiko.SFTPServer,
948
1065
StubSFTPServer, root=self._root,
949
1066
home=self._server_homedir)
950
1067
event = threading.Event()
951
1068
ssh_server.start_server(event, server)
953
stop_event.wait(30.0)
955
1071
def setUp(self):
957
self._original_vendor = _ssh_vendor
958
_ssh_vendor = self._vendor
959
self._homedir = os.getcwdu()
1072
self._original_vendor = ssh._ssh_vendor
1073
ssh._ssh_vendor = self._vendor
1074
if sys.platform == 'win32':
1075
# Win32 needs to use the UNICODE api
1076
self._homedir = getcwd()
1078
# But Linux SFTP servers should just deal in bytestreams
1079
self._homedir = os.getcwd()
960
1080
if self._server_homedir is None:
961
1081
self._server_homedir = self._homedir
962
1082
self._root = '/'
963
# FIXME WINDOWS: _root should be _server_homedir[0]:/
964
self._listener = SingleListener(self._run_server)
1083
if sys.platform == 'win32':
1085
self._listener = SocketListener(self._run_server_entry)
965
1086
self._listener.setDaemon(True)
966
1087
self._listener.start()
968
1089
def tearDown(self):
969
1090
"""See bzrlib.transport.Server.tearDown."""
971
1091
self._listener.stop()
972
_ssh_vendor = self._original_vendor
1092
ssh._ssh_vendor = self._original_vendor
1094
def get_bogus_url(self):
1095
"""See bzrlib.transport.Server.get_bogus_url."""
1096
# this is chosen to try to prevent trouble with proxies, wierd dns, etc
1097
# we bind a random socket, so that we get a guaranteed unused port
1098
# we just never listen on that port
1100
s.bind(('localhost', 0))
1101
return 'sftp://%s:%s/' % s.getsockname()
975
1104
class SFTPFullAbsoluteServer(SFTPServer):
1030
1175
super(SFTPSiblingAbsoluteServer, self).setUp()
1178
def _sftp_connect(host, port, username, password):
1179
"""Connect to the remote sftp server.
1181
:raises: a TransportError 'could not connect'.
1183
:returns: an paramiko.sftp_client.SFTPClient
1185
TODO: Raise a more reasonable ConnectionFailed exception
1187
idx = (host, port, username)
1189
return _connected_hosts[idx]
1193
sftp = _sftp_connect_uncached(host, port, username, password)
1194
_connected_hosts[idx] = sftp
1197
def _sftp_connect_uncached(host, port, username, password):
1198
vendor = ssh._get_ssh_vendor()
1199
sftp = vendor.connect_sftp(username, password, host, port)
1033
1203
def get_test_permutations():
1034
1204
"""Return the permutations to be used in testing."""
1035
1205
return [(SFTPTransport, SFTPAbsoluteServer),
added
removed
bzrlib/transport/sftp.py
