-import os, tempfile, heapq, binascii, traceback, array, stat, struct
+import heapq, traceback, array, stat, struct
from types import NoneType
from stat import S_IFREG, S_IFDIR
from time import time, strftime, localtime
from allmydata.interfaces import IFileNode, IDirectoryNode, ExistingChildError, \
NoSuchChildError, ChildOfWrongTypeError
from allmydata.mutable.common import NotWriteableError
+from allmydata.mutable.publish import MutableFileHandle
from allmydata.immutable.upload import FileHandle
from allmydata.dirnode import update_metadata
-
-from pycryptopp.cipher.aes import AES
+from allmydata.util.fileutil import EncryptedTemporaryFile
noisy = True
use_foolscap_logging = True
st_gid = "tahoe"
st_mtime = attrs.get("mtime", 0)
st_mode = attrs["permissions"]
- st_size = attrs.get("size", "?")
+
+ # Some clients won't tolerate '?' in the size field (#1337).
+ st_size = attrs.get("size", 0)
+
# We don't know how many links there really are to this object.
st_nlink = 1
return None
-class EncryptedTemporaryFile(PrefixingLogMixin):
- # not implemented: next, readline, readlines, xreadlines, writelines
-
- def __init__(self):
- PrefixingLogMixin.__init__(self, facility="tahoe.sftp")
- self.file = tempfile.TemporaryFile()
- self.key = os.urandom(16) # AES-128
-
- def _crypt(self, offset, data):
- # TODO: use random-access AES (pycryptopp ticket #18)
- offset_big = offset // 16
- offset_small = offset % 16
- iv = binascii.unhexlify("%032x" % offset_big)
- cipher = AES(self.key, iv=iv)
- cipher.process("\x00"*offset_small)
- return cipher.process(data)
-
- def close(self):
- self.file.close()
-
- def flush(self):
- self.file.flush()
-
- def seek(self, offset, whence=0): # 0 = SEEK_SET
- if noisy: self.log(".seek(%r, %r)" % (offset, whence), level=NOISY)
- self.file.seek(offset, whence)
-
- def tell(self):
- offset = self.file.tell()
- if noisy: self.log(".tell() = %r" % (offset,), level=NOISY)
- return offset
-
- def read(self, size=-1):
- if noisy: self.log(".read(%r)" % (size,), level=NOISY)
- index = self.file.tell()
- ciphertext = self.file.read(size)
- plaintext = self._crypt(index, ciphertext)
- return plaintext
-
- def write(self, plaintext):
- if noisy: self.log(".write(<data of length %r>)" % (len(plaintext),), level=NOISY)
- index = self.file.tell()
- ciphertext = self._crypt(index, plaintext)
- self.file.write(ciphertext)
-
- def truncate(self, newsize):
- if noisy: self.log(".truncate(%r)" % (newsize,), level=NOISY)
- self.file.truncate(newsize)
-
-
class OverwriteableFileConsumer(PrefixingLogMixin):
implements(IFinishableConsumer)
"""I act both as a consumer for the download of the original file contents, and as a
The caller must perform no more overwrites until the Deferred has fired."""
if noisy: self.log(".read(%r, %r), current_size = %r" % (offset, length, self.current_size), level=NOISY)
+
+ # Note that the overwrite method is synchronous. When a write request is processed
+ # (e.g. a writeChunk request on the async queue of GeneralSFTPFile), overwrite will
+ # be called and will update self.current_size if necessary before returning. Therefore,
+ # self.current_size will be up-to-date for a subsequent call to this read method, and
+ # so it is correct to do the check for a read past the end-of-file here.
if offset >= self.current_size:
def _eof(): raise EOFError("read past end of file")
return defer.execute(_eof)
else:
assert IFileNode.providedBy(filenode), filenode
- if filenode.is_mutable():
- self.async.addCallback(lambda ign: filenode.download_best_version())
- def _downloaded(data):
- self.consumer = OverwriteableFileConsumer(len(data), tempfile_maker)
- self.consumer.write(data)
- self.consumer.finish()
- return None
- self.async.addCallback(_downloaded)
- else:
- download_size = filenode.get_size()
- assert download_size is not None, "download_size is None"
+ self.async.addCallback(lambda ignored: filenode.get_best_readable_version())
+
+ def _read(version):
+ if noisy: self.log("_read", level=NOISY)
+ download_size = version.get_size()
+ assert download_size is not None
+
self.consumer = OverwriteableFileConsumer(download_size, tempfile_maker)
- def _read(ign):
- if noisy: self.log("_read immutable", level=NOISY)
- filenode.read(self.consumer, 0, None)
- self.async.addCallback(_read)
+
+ version.read(self.consumer, 0, None)
+ self.async.addCallback(_read)
eventually(self.async.callback, None)
abandoned = self.abandoned
parent = self.parent
childname = self.childname
-
+
# has_changed is set when writeChunk is called, not when the write occurs, so
# it is correct to optimize out the commit if it is False at the close call.
has_changed = self.has_changed
assert parent and childname, (parent, childname, self.metadata)
d2.addCallback(lambda ign: parent.set_metadata_for(childname, self.metadata))
- d2.addCallback(lambda ign: self.consumer.get_current_size())
- d2.addCallback(lambda size: self.consumer.read(0, size))
- d2.addCallback(lambda new_contents: self.filenode.overwrite(new_contents))
+ d2.addCallback(lambda ign: self.filenode.overwrite(MutableFileHandle(self.consumer.get_file())))
else:
def _add_file(ign):
self.log("_add_file childname=%r" % (childname,), level=OPERATIONAL)
def _abandon_any_heisenfiles(self, userpath, direntry):
request = "._abandon_any_heisenfiles(%r, %r)" % (userpath, direntry)
self.log(request, level=OPERATIONAL)
-
+
assert isinstance(userpath, str), userpath
# First we synchronously mark all heisenfiles matching the userpath or direntry
if hasattr(protocol, 'transport') and protocol.transport is None:
protocol.transport = FakeTransport() # work around Twisted bug
- d = defer.succeed(None)
- d.addCallback(lambda ign: protocol.write("This server supports only SFTP, not shell sessions.\n"))
- d.addCallback(lambda ign: protocol.processEnded(Reason(ProcessTerminated(exitCode=1))))
- return d
+ return self._unsupported(protocol)
def execCommand(self, protocol, cmd):
self.log(".execCommand(%r, %r)" % (protocol, cmd), level=OPERATIONAL)
d = defer.succeed(None)
if cmd == "df -P -k /":
d.addCallback(lambda ign: protocol.write(
- "Filesystem 1024-blocks Used Available Capacity Mounted on\n"
- "tahoe 628318530 314159265 314159265 50% /\n"))
+ "Filesystem 1024-blocks Used Available Capacity Mounted on\r\n"
+ "tahoe 628318530 314159265 314159265 50% /\r\n"))
d.addCallback(lambda ign: protocol.processEnded(Reason(ProcessDone(None))))
else:
- d.addCallback(lambda ign: protocol.processEnded(Reason(ProcessTerminated(exitCode=1))))
+ d.addCallback(lambda ign: self._unsupported(protocol))
+ return d
+
+ def _unsupported(self, protocol):
+ d = defer.succeed(None)
+ d.addCallback(lambda ign: protocol.errReceived(
+ "This server supports only the SFTP protocol. It does not support SCP,\r\n"
+ "interactive shell sessions, or commands other than one needed by sshfs.\r\n"))
+ d.addCallback(lambda ign: protocol.processEnded(Reason(ProcessTerminated(exitCode=1))))
return d
def windowChanged(self, newWindowSize):
projects / tahoe-lafs / tahoe-lafs.git / blobdiff