/usr/lib/python3/dist-packages/asyncssh/scp.py is in python3-asyncssh 1.11.1-1.
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# All rights reserved.
#
# This program and the accompanying materials are made available under
# the terms of the Eclipse Public License v1.0 which accompanies this
# distribution and is available at:
#
# http://www.eclipse.org/legal/epl-v10.html
#
# Contributors:
# Ron Frederick - initial implementation, API, and documentation
# Jonathan Slenders - proposed changes to allow SFTP server callbacks
# to be coroutines
"""SCP handlers"""
import argparse
import asyncio
import posixpath
import shlex
import stat
from .constants import DEFAULT_LANG
from .constants import FX_BAD_MESSAGE, FX_CONNECTION_LOST, FX_FAILURE
from .sftp import LocalFile, match_glob
from .sftp import SFTP_BLOCK_SIZE, SFTPAttrs, SFTPError, SFTPServerFile
def _parse_cd_args(args):
"""Parse arguments to an SCP copy or dir request"""
try:
permissions, size, name = args.split()
return int(permissions, 8), int(size), name
except ValueError:
raise SCPError(FX_BAD_MESSAGE, 'Invalid copy or dir request') from None
def _parse_t_args(args):
"""Parse argument to an SCP time request"""
try:
atime, _, mtime, _ = args.split()
return int(atime), int(mtime)
except ValueError:
raise SCPError(FX_BAD_MESSAGE, 'Invalid time request') from None
@asyncio.coroutine
def _parse_path(path):
"""Convert an SCP path into an SSHClientConnection and path"""
from . import connect
if isinstance(path, tuple):
conn, path = path
elif isinstance(path, str) and ':' in path:
conn, path = path.split(':')
elif isinstance(path, bytes) and b':' in path:
conn, path = path.split(b':')
elif isinstance(path, (str, bytes)):
conn = None
else:
conn = path
path = b'.'
if isinstance(conn, (str, bytes)):
close_conn = True
conn = yield from connect(conn)
elif isinstance(conn, tuple):
close_conn = True
conn = yield from connect(*conn)
else:
close_conn = False
return conn, path, close_conn
@asyncio.coroutine
def _start_remote(conn, source, must_be_dir, preserve, recurse, path):
"""Start remote SCP server"""
if isinstance(path, str):
path = path.encode('utf-8')
command = (b'scp ' + (b'-f ' if source else b'-t ') +
(b'-d ' if must_be_dir else b'') +
(b'-p ' if preserve else b'') +
(b'-r ' if recurse else b'') + path)
writer, reader, _ = yield from conn.open_session(command, encoding=None)
return reader, writer
class SCPError(SFTPError):
"""SCP error"""
def __init__(self, code, reason, path=None, fatal=False,
suppress_send=False, lang=DEFAULT_LANG):
if isinstance(reason, bytes):
reason = reason.decode('utf-8', errors='replace')
if isinstance(path, bytes):
path = path.decode('utf-8', errors='replace')
if path:
reason = reason + ': ' + path
super().__init__(code, reason, lang)
self.fatal = fatal
self.suppress_send = suppress_send
class _SCPArgParser(argparse.ArgumentParser):
"""A parser for SCP arguments"""
def __init__(self):
super().__init__(add_help=False)
group = self.add_mutually_exclusive_group(required=True)
group.add_argument('-f', dest='source', action='store_true')
group.add_argument('-t', dest='source', action='store_false')
self.add_argument('-d', dest='must_be_dir', action='store_true')
self.add_argument('-p', dest='preserve', action='store_true')
self.add_argument('-r', dest='recurse', action='store_true')
self.add_argument('-v', dest='verbose', action='store_true')
self.add_argument('path')
def error(self, message):
raise ValueError(message)
def parse(self, command):
"""Parse an SCP command"""
return self.parse_args(shlex.split(command)[1:])
class _SCPHandler:
"""SCP handler"""
def __init__(self, reader, writer, error_handler=None):
self._reader = reader
self._writer = writer
self._error_handler = error_handler
@asyncio.coroutine
def await_response(self):
"""Wait for an SCP response"""
result = yield from self._reader.read(1)
if result != b'\0':
reason = yield from self._reader.readline()
if not result or not reason.endswith(b'\n'):
raise SCPError(FX_CONNECTION_LOST, 'Connection lost',
fatal=True, suppress_send=True)
if result not in b'\x01\x02':
reason = result + reason
return SCPError(FX_FAILURE, reason[:-1], fatal=result != b'\x01',
suppress_send=True)
return None
def send_request(self, *args):
"""Send an SCP request"""
self._writer.write(b''.join(args) + b'\n')
@asyncio.coroutine
def make_request(self, *args):
"""Send an SCP request and wait for a response"""
self.send_request(*args)
exc = yield from self.await_response()
if exc:
raise exc
@asyncio.coroutine
def send_data(self, data):
"""Send SCP file data"""
self._writer.write(data)
yield from self._writer.drain()
def send_ok(self):
"""Send an SCP OK response"""
self._writer.write(b'\0')
def send_error(self, exc):
"""Send an SCP error response"""
if isinstance(exc, SFTPError):
reason = exc.reason.encode('utf-8')
elif isinstance(exc, OSError): # pragma: no branch (win32)
reason = exc.strerror.encode('utf-8')
if exc.filename:
if isinstance(exc.filename, str): # pragma: no cover (win32)
exc.filename = exc.filename.encode('utf-8')
reason += b': ' + exc.filename
else: # pragma: no cover (win32)
reason = str(exc).encode('utf-8')
fatal = getattr(exc, 'fatal', False)
self._writer.write((b'\x02' if fatal else b'\x01') +
b'scp: ' + reason + b'\n')
@asyncio.coroutine
def recv_request(self):
"""Receive SCP request"""
request = yield from self._reader.readline()
if not request:
return None, None
return request[:1], request[1:-1]
@asyncio.coroutine
def recv_data(self, n):
"""Receive SCP file data"""
return (yield from self._reader.read(n))
def handle_error(self, exc):
"""Handle an SCP error"""
if isinstance(exc, BrokenPipeError):
exc = SCPError(FX_CONNECTION_LOST, 'Connection lost',
fatal=True, suppress_send=True)
if not getattr(exc, 'suppress_send', False):
self.send_error(exc)
if getattr(exc, 'fatal', False) or self._error_handler is None:
raise exc from None
elif self._error_handler:
self._error_handler(exc)
def close(self):
"""Close an SCP session"""
self._writer.close()
class _SCPSource(_SCPHandler):
"""SCP handler for sending files"""
def __init__(self, fs, reader, writer, preserve, recurse,
block_size=SFTP_BLOCK_SIZE, progress_handler=None,
error_handler=None):
super().__init__(reader, writer, error_handler)
self._fs = fs
self._preserve = preserve
self._recurse = recurse
self._block_size = block_size
self._progress_handler = progress_handler
@asyncio.coroutine
def _make_cd_request(self, action, attrs, size, path):
"""Make an SCP copy or dir request"""
args = '%04o %d ' % (attrs.permissions & 0o7777, size)
yield from self.make_request(action, args.encode('ascii'),
posixpath.basename(path))
@asyncio.coroutine
def _make_t_request(self, attrs):
"""Make an SCP time request"""
args = '%d 0 %d 0' % (attrs.atime, attrs.mtime)
yield from self.make_request(b'T', args.encode('ascii'))
@asyncio.coroutine
def _send_file(self, srcpath, dstpath, attrs):
"""Send a file over SCP"""
file_obj = yield from self._fs.open(srcpath, 'rb')
size = attrs.size
local_exc = None
offset = 0
try:
yield from self._make_cd_request(b'C', attrs, size, srcpath)
while offset < size:
blocklen = min(size - offset, self._block_size)
if local_exc:
data = blocklen * b'\0'
else:
try:
data = yield from file_obj.read(blocklen, offset)
if not data:
raise SCPError(FX_FAILURE, 'Unexpected EOF')
except (OSError, SFTPError) as exc:
local_exc = exc
yield from self.send_data(data)
offset += len(data)
if self._progress_handler:
self._progress_handler(srcpath, dstpath, offset, size)
finally:
yield from file_obj.close()
if local_exc:
self.send_error(local_exc)
local_exc.suppress_send = True
else:
self.send_ok()
remote_exc = yield from self.await_response()
exc = remote_exc or local_exc
if exc:
raise exc
@asyncio.coroutine
def _send_dir(self, srcpath, dstpath, attrs):
"""Send directory over SCP"""
yield from self._make_cd_request(b'D', attrs, 0, srcpath)
for name in (yield from self._fs.listdir(srcpath)):
if name in (b'.', b'..'):
continue
yield from self._send_files(posixpath.join(srcpath, name),
posixpath.join(dstpath, name))
yield from self.make_request(b'E')
@asyncio.coroutine
def _send_files(self, srcpath, dstpath):
"""Send files via SCP"""
try:
attrs = yield from self._fs.stat(srcpath)
if self._preserve:
yield from self._make_t_request(attrs)
if self._recurse and stat.S_ISDIR(attrs.permissions):
yield from self._send_dir(srcpath, dstpath, attrs)
elif stat.S_ISREG(attrs.permissions):
yield from self._send_file(srcpath, dstpath, attrs)
else:
raise SCPError(FX_FAILURE, 'Not a regular file', srcpath)
except (OSError, SFTPError, ValueError) as exc:
self.handle_error(exc)
@asyncio.coroutine
def run(self, srcpath):
"""Start SCP transfer"""
try:
if isinstance(srcpath, str):
srcpath = srcpath.encode('utf-8')
exc = yield from self.await_response()
if exc:
raise exc
for path in (yield from match_glob(self._fs, srcpath)):
yield from self._send_files(path, b'')
except (OSError, SFTPError) as exc:
self.handle_error(exc)
finally:
self.close()
class _SCPSink(_SCPHandler):
"""SCP handler for receiving files"""
def __init__(self, fs, reader, writer, must_be_dir, preserve, recurse,
block_size=SFTP_BLOCK_SIZE, progress_handler=None,
error_handler=None):
super().__init__(reader, writer, error_handler)
self._fs = fs
self._must_be_dir = must_be_dir
self._preserve = preserve
self._recurse = recurse
self._block_size = block_size
self._progress_handler = progress_handler
@asyncio.coroutine
def _recv_file(self, srcpath, dstpath, size):
"""Receive a file via SCP"""
file_obj = yield from self._fs.open(dstpath, 'wb')
local_exc = None
offset = 0
try:
self.send_ok()
while offset < size:
blocklen = min(size - offset, self._block_size)
data = yield from self.recv_data(blocklen)
if not data:
raise SCPError(FX_CONNECTION_LOST, 'Connection lost',
fatal=True, suppress_send=True)
if not local_exc:
try:
yield from file_obj.write(data, offset)
except (OSError, SFTPError) as exc:
local_exc = exc
offset += len(data)
if self._progress_handler:
self._progress_handler(srcpath, dstpath, offset, size)
finally:
yield from file_obj.close()
remote_exc = yield from self.await_response()
if local_exc:
self.send_error(local_exc)
local_exc.suppress_send = True
else:
self.send_ok()
exc = remote_exc or local_exc
if exc:
raise exc
@asyncio.coroutine
def _recv_dir(self, srcpath, dstpath):
"""Receive a directory over SCP"""
if not self._recurse:
raise SCPError(FX_BAD_MESSAGE, 'Directory received without recurse')
if (yield from self._fs.exists(dstpath)):
if not (yield from self._fs.isdir(dstpath)):
raise SCPError(FX_FAILURE, 'Not a directory', dstpath)
else:
yield from self._fs.mkdir(dstpath)
yield from self._recv_files(srcpath, dstpath)
@asyncio.coroutine
def _recv_files(self, srcpath, dstpath):
"""Receive files over SCP"""
self.send_ok()
attrs = SFTPAttrs()
while True:
action, args = yield from self.recv_request()
if not action:
break
try:
if action in b'\x01\x02':
raise SCPError(FX_FAILURE, args, fatal=action != b'\x01',
suppress_send=True)
elif action == b'T':
if self._preserve:
attrs.atime, attrs.mtime = _parse_t_args(args)
self.send_ok()
elif action == b'E':
self.send_ok()
elif action in b'CD':
try:
attrs.permissions, size, name = _parse_cd_args(args)
new_srcpath = posixpath.join(srcpath, name)
if (yield from self._fs.isdir(dstpath)):
new_dstpath = posixpath.join(dstpath, name)
else:
new_dstpath = dstpath
if action == b'D':
yield from self._recv_dir(new_srcpath, new_dstpath)
else:
yield from self._recv_file(new_srcpath,
new_dstpath, size)
if self._preserve:
yield from self._fs.setstat(new_dstpath, attrs)
finally:
attrs = SFTPAttrs()
else:
raise SCPError(FX_BAD_MESSAGE, 'Unknown request')
except (OSError, SFTPError) as exc:
self.handle_error(exc)
@asyncio.coroutine
def run(self, dstpath):
"""Start SCP file receive"""
try:
if isinstance(dstpath, str):
dstpath = dstpath.encode('utf-8')
if self._must_be_dir and not (yield from self._fs.isdir(dstpath)):
self.handle_error(SCPError(FX_FAILURE, 'Not a directory',
dstpath))
else:
yield from self._recv_files(b'', dstpath)
except (OSError, SFTPError, ValueError) as exc:
self.handle_error(exc)
finally:
self.close()
class _SCPCopier:
"""SCP handler for remote-to-remote copies"""
def __init__(self, src_reader, src_writer, dst_reader, dst_writer,
block_size=SFTP_BLOCK_SIZE, progress_handler=None,
error_handler=None):
self._source = _SCPHandler(src_reader, src_writer)
self._sink = _SCPHandler(dst_reader, dst_writer)
self._block_size = block_size
self._progress_handler = progress_handler
self._error_handler = error_handler
def _handle_error(self, exc):
"""Handle an SCP error"""
if isinstance(exc, BrokenPipeError):
exc = SCPError(FX_CONNECTION_LOST, 'Connection lost', fatal=True)
if self._error_handler and not getattr(exc, 'fatal', False):
self._error_handler(exc)
else:
raise exc
@asyncio.coroutine
def _forward_response(self, src, dst):
"""Forward an SCP response between two remote SCP servers"""
# pylint: disable=no-self-use
try:
exc = yield from src.await_response()
if exc:
dst.send_error(exc)
return exc
else:
dst.send_ok()
return None
except OSError as exc:
return exc
@asyncio.coroutine
def _copy_file(self, path, size):
"""Copy a file from one remote SCP server to another"""
offset = 0
while offset < size:
blocklen = min(size - offset, self._block_size)
data = yield from self._source.recv_data(blocklen)
if not data:
raise SCPError(FX_CONNECTION_LOST, 'Connection lost',
fatal=True)
yield from self._sink.send_data(data)
offset += len(data)
if self._progress_handler:
self._progress_handler(path, path, offset, size)
source_exc = yield from self._forward_response(self._source, self._sink)
sink_exc = yield from self._forward_response(self._sink, self._source)
exc = sink_exc or source_exc
if exc:
self._handle_error(exc)
@asyncio.coroutine
def run(self):
"""Start SCP remote-to-remote transfer"""
paths = []
try:
exc = yield from self._forward_response(self._sink, self._source)
if exc:
self._handle_error(exc)
while True:
action, args = yield from self._source.recv_request()
if not action:
break
self._sink.send_request(action, args)
if action in b'\x01\x02':
exc = SCPError(FX_FAILURE, args, fatal=action != b'\x01')
self._handle_error(exc)
continue
exc = yield from self._forward_response(self._sink,
self._source)
if exc:
self._handle_error(exc)
continue
if action in b'CD':
_, size, name = _parse_cd_args(args)
if action == b'C':
path = b'/'.join(paths + [name])
yield from self._copy_file(path, size)
else:
paths.append(name)
elif action == b'E':
if paths:
paths.pop()
else:
break
elif action != b'T':
raise SCPError(FX_BAD_MESSAGE, 'Unknown SCP action')
except (OSError, SFTPError) as exc:
self._handle_error(exc)
finally:
self._source.close()
self._sink.close()
@asyncio.coroutine
def scp(srcpaths, dstpath=None, *, preserve=False, recurse=False,
block_size=SFTP_BLOCK_SIZE, progress_handler=None, error_handler=None):
"""Copy files using SCP
This function is a coroutine which copies one or more files or
directories using the SCP protocol. Source and destination paths
can be string or bytes values to reference local files or can be
a tuple of the form ``(conn, path)`` where ``conn`` is an open
:class:`SSHClientConnection` to reference files and directories
on a remote system.
For convenience, a host name or tuple of the form ``(host, port)``
can be provided in place of the :class:`SSHClientConnection` to
request that a new SSH connection be opened to a host using
default connect arguments. A string or bytes value of the form
``'host:path'`` may also be used in place of the ``(conn, path)``
tuple to make a new connection to the requested host on the
default SSH port.
Either a single source path or a sequence of source paths can be
provided, and each path can contain '*' and '?' wildcard characters
which can be used to match multiple source files or directories.
When copying a single file or directory, the destination path
can be either the full path to copy data into or the path to an
existing directory where the data should be placed. In the latter
case, the base file name from the source path will be used as the
destination name.
When copying multiple files, the destination path must refer to
a directory. If it doesn't already exist, a directory will be
created with that name.
If the destination path is an :class:`SSHClientConnection` without
a path or the path provided is empty, files are copied into the
default destination working directory.
If preserve is ``True``, the access and modification times and
permissions of the original files and directories are set on the
copied files. However, do to the timing of when this information
is sent, the preserved access time will be what was set on the
source file before the copy begins. So, the access time on the
source file will no longer match the destination after the
transfer completes.
If recurse is ``True`` and the source path points at a directory,
the entire subtree under that directory is copied.
Symbolic links found on the source will have the contents of their
target copied rather than creating a destination symbolic link.
When using this option during a recursive copy, one needs to watch
out for links that result in loops. SCP does not provide a
mechanism for preserving links. If you need this, consider using
SFTP instead.
The block_size value controls the size of read and write operations
issued to copy the files. It defaults to 16 KB.
If progress_handler is specified, it will be called after each
block of a file is successfully copied. The arguments passed to
this handler will be the relative path of the file being copied,
bytes copied so far, and total bytes in the file being copied. If
multiple source paths are provided or recurse is set to ``True``,
the progress_handler will be called consecutively on each file
being copied.
If error_handler is specified and an error occurs during the copy,
this handler will be called with the exception instead of it being
raised. This is intended to primarily be used when multiple source
paths are provided or when recurse is set to ``True``, to allow
error information to be collected without aborting the copy of the
remaining files. The error handler can raise an exception if it
wants the copy to completely stop. Otherwise, after an error, the
copy will continue starting with the next file.
:param srcpaths:
The paths of the source files or directories to copy
:param dstpath: (optional)
The path of the destination file or directory to copy into
:param bool preserve: (optional)
Whether or not to preserve the original file attributes
:param bool recurse: (optional)
Whether or not to recursively copy directories
:param int block_size: (optional)
The block size to use for file reads and writes
:param callable progress_handler: (optional)
The function to call to report copy progress
:param callable error_handler: (optional)
The function to call when an error occurs
:raises: | :exc:`OSError` if a local file I/O error occurs
| :exc:`SFTPError` if the server returns an error
| :exc:`ValueError` if both source and destination are local
"""
if (isinstance(srcpaths, (str, bytes)) or
(isinstance(srcpaths, tuple) and len(srcpaths) == 2)):
srcpaths = [srcpaths]
must_be_dir = len(srcpaths) > 1
dstconn, dstpath, close_dst = yield from _parse_path(dstpath)
try:
for srcpath in srcpaths:
srcconn, srcpath, close_src = yield from _parse_path(srcpath)
try:
if srcconn and dstconn:
src_reader, src_writer = yield from _start_remote(
srcconn, True, must_be_dir, preserve, recurse, srcpath)
dst_reader, dst_writer = yield from _start_remote(
dstconn, False, must_be_dir, preserve, recurse, dstpath)
copier = _SCPCopier(src_reader, src_writer, dst_reader,
dst_writer, block_size,
progress_handler, error_handler)
yield from copier.run()
elif srcconn:
reader, writer = yield from _start_remote(
srcconn, True, must_be_dir, preserve, recurse, srcpath)
sink = _SCPSink(LocalFile, reader, writer, must_be_dir,
preserve, recurse, block_size,
progress_handler, error_handler)
yield from sink.run(dstpath)
elif dstconn:
reader, writer = yield from _start_remote(
dstconn, False, must_be_dir, preserve, recurse, dstpath)
source = _SCPSource(LocalFile, reader, writer,
preserve, recurse, block_size,
progress_handler, error_handler)
yield from source.run(srcpath)
else:
raise ValueError('Local copy not supported')
finally:
if close_src:
srcconn.close()
yield from srcconn.wait_closed()
finally:
if close_dst:
dstconn.close()
yield from dstconn.wait_closed()
@asyncio.coroutine
def run_scp_server(sftp_server, command, stdin, stdout, stderr):
"""Return a handler for an SCP server session"""
try:
args = _SCPArgParser().parse(command)
except ValueError as exc:
stderr.write(b'scp: ' + str(exc).encode('utf-8') + b'\n')
stderr.channel.exit(1)
return
fs = SFTPServerFile(sftp_server)
if args.source:
handler = _SCPSource(fs, stdin, stdout, args.preserve, args.recurse,
error_handler=False)
else:
handler = _SCPSink(fs, stdin, stdout, args.must_be_dir, args.preserve,
args.recurse, error_handler=False)
try:
yield from handler.run(args.path)
finally:
sftp_server.exit()
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