1 # Copyright (c) Twisted Matrix Laboratories.
2 # See LICENSE for details.
5 This module contains interfaces defined for the L{twisted.conch} package.
8 from zope.interface import Interface, Attribute
10 class IConchUser(Interface):
12 A user who has been authenticated to Cred through Conch. This is
13 the interface between the SSH connection and the user.
16 conn = Attribute('The SSHConnection object for this user.')
18 def lookupChannel(channelType, windowSize, maxPacket, data):
20 The other side requested a channel of some sort.
21 channelType is the type of channel being requested,
22 windowSize is the initial size of the remote window,
23 maxPacket is the largest packet we should send,
24 data is any other packet data (often nothing).
26 We return a subclass of L{SSHChannel<ssh.channel.SSHChannel>}. If
27 an appropriate channel can not be found, an exception will be
28 raised. If a L{ConchError<error.ConchError>} is raised, the .value
29 will be the message, and the .data will be the error code.
31 @type channelType: C{str}
32 @type windowSize: C{int}
33 @type maxPacket: C{int}
35 @rtype: subclass of L{SSHChannel}/C{tuple}
38 def lookupSubsystem(subsystem, data):
40 The other side requested a subsystem.
41 subsystem is the name of the subsystem being requested.
42 data is any other packet data (often nothing).
44 We return a L{Protocol}.
47 def gotGlobalRequest(requestType, data):
49 A global request was sent from the other side.
51 By default, this dispatches to a method 'channel_channelType' with any
52 non-alphanumerics in the channelType replace with _'s. If it cannot
53 find a suitable method, it returns an OPEN_UNKNOWN_CHANNEL_TYPE error.
54 The method is called with arguments of windowSize, maxPacket, data.
57 class ISession(Interface):
59 def getPty(term, windowSize, modes):
61 Get a psuedo-terminal for use by a shell or command.
63 If a psuedo-terminal is not available, or the request otherwise
64 fails, raise an exception.
69 Open a shell and connect it to proto.
71 @param proto: a L{ProcessProtocol} instance.
74 def execCommand(proto, command):
78 @param proto: a L{ProcessProtocol} instance.
81 def windowChanged(newWindowSize):
83 Called when the size of the remote screen has changed.
88 Called when the other side has indicated no more data will be sent.
93 Called when the session is closed.
97 class ISFTPServer(Interface):
99 The only attribute of this class is "avatar". It is the avatar
100 returned by the Realm that we are authenticated with, and
101 represents the logged-in user. Each method should check to verify
102 that the user has permission for their actions.
105 def gotVersion(otherVersion, extData):
107 Called when the client sends their version info.
109 otherVersion is an integer representing the version of the SFTP
110 protocol they are claiming.
111 extData is a dictionary of extended_name : extended_data items.
112 These items are sent by the client to indicate additional features.
114 This method should return a dictionary of extended_name : extended_data
115 items. These items are the additional features (if any) supported
120 def openFile(filename, flags, attrs):
122 Called when the clients asks to open a file.
124 @param filename: a string representing the file to open.
126 @param flags: an integer of the flags to open the file with, ORed together.
127 The flags and their values are listed at the bottom of this file.
129 @param attrs: a list of attributes to open the file with. It is a
130 dictionary, consisting of 0 or more keys. The possible keys are::
132 size: the size of the file in bytes
133 uid: the user ID of the file as an integer
134 gid: the group ID of the file as an integer
135 permissions: the permissions of the file with as an integer.
136 the bit representation of this field is defined by POSIX.
137 atime: the access time of the file as seconds since the epoch.
138 mtime: the modification time of the file as seconds since the epoch.
139 ext_*: extended attributes. The server is not required to
140 understand this, but it may.
142 NOTE: there is no way to indicate text or binary files. it is up
143 to the SFTP client to deal with this.
145 This method returns an object that meets the ISFTPFile interface.
146 Alternatively, it can return a L{Deferred} that will be called back
150 def removeFile(filename):
152 Remove the given file.
154 This method returns when the remove succeeds, or a Deferred that is
155 called back when it succeeds.
157 @param filename: the name of the file as a string.
160 def renameFile(oldpath, newpath):
162 Rename the given file.
164 This method returns when the rename succeeds, or a L{Deferred} that is
165 called back when it succeeds. If the rename fails, C{renameFile} will
166 raise an implementation-dependent exception.
168 @param oldpath: the current location of the file.
169 @param newpath: the new file name.
172 def makeDirectory(path, attrs):
176 This method returns when the directory is created, or a Deferred that
177 is called back when it is created.
179 @param path: the name of the directory to create as a string.
180 @param attrs: a dictionary of attributes to create the directory with.
181 Its meaning is the same as the attrs in the L{openFile} method.
184 def removeDirectory(path):
186 Remove a directory (non-recursively)
188 It is an error to remove a directory that has files or directories in
191 This method returns when the directory is removed, or a Deferred that
192 is called back when it is removed.
194 @param path: the directory to remove.
197 def openDirectory(path):
199 Open a directory for scanning.
201 This method returns an iterable object that has a close() method,
202 or a Deferred that is called back with same.
204 The close() method is called when the client is finished reading
205 from the directory. At this point, the iterable will no longer
208 The iterable should return triples of the form (filename,
209 longname, attrs) or Deferreds that return the same. The
210 sequence must support __getitem__, but otherwise may be any
211 'sequence-like' object.
213 filename is the name of the file relative to the directory.
214 logname is an expanded format of the filename. The recommended format
216 -rwxr-xr-x 1 mjos staff 348911 Mar 25 14:29 t-filexfer
217 1234567890 123 12345678 12345678 12345678 123456789012
219 The first line is sample output, the second is the length of the field.
220 The fields are: permissions, link count, user owner, group owner,
221 size in bytes, modification time.
223 attrs is a dictionary in the format of the attrs argument to openFile.
225 @param path: the directory to open.
228 def getAttrs(path, followLinks):
230 Return the attributes for the given path.
232 This method returns a dictionary in the same format as the attrs
233 argument to openFile or a Deferred that is called back with same.
235 @param path: the path to return attributes for as a string.
236 @param followLinks: a boolean. If it is True, follow symbolic links
237 and return attributes for the real path at the base. If it is False,
238 return attributes for the specified path.
241 def setAttrs(path, attrs):
243 Set the attributes for the path.
245 This method returns when the attributes are set or a Deferred that is
246 called back when they are.
248 @param path: the path to set attributes for as a string.
249 @param attrs: a dictionary in the same format as the attrs argument to
255 Find the root of a set of symbolic links.
257 This method returns the target of the link, or a Deferred that
260 @param path: the path of the symlink to read.
263 def makeLink(linkPath, targetPath):
265 Create a symbolic link.
267 This method returns when the link is made, or a Deferred that
270 @param linkPath: the pathname of the symlink as a string.
271 @param targetPath: the path of the target of the link as a string.
276 Convert any path to an absolute path.
278 This method returns the absolute path as a string, or a Deferred
279 that returns the same.
281 @param path: the path to convert as a string.
284 def extendedRequest(extendedName, extendedData):
286 This is the extension mechanism for SFTP. The other side can send us
289 If we don't implement the request given by extendedName, raise
292 The return value is a string, or a Deferred that will be called
295 @param extendedName: the name of the request as a string.
296 @param extendedData: the data the other side sent with the request,
302 class IKnownHostEntry(Interface):
304 A L{IKnownHostEntry} is an entry in an OpenSSH-formatted C{known_hosts}
312 Return True if this entry matches the given Key object, False
315 @param key: The key object to match against.
316 @type key: L{twisted.conch.ssh.Key}
320 def matchesHost(hostname):
322 Return True if this entry matches the given hostname, False otherwise.
324 Note that this does no name resolution; if you want to match an IP
325 address, you have to resolve it yourself, and pass it in as a dotted
328 @param key: The hostname to match against.
335 @return: a serialized string representation of this entry, suitable for
336 inclusion in a known_hosts file. (Newline not included.)
343 class ISFTPFile(Interface):
345 This represents an open file on the server. An object adhering to this
346 interface should be returned from L{openFile}().
353 This method returns nothing if the close succeeds immediately, or a
354 Deferred that is called back when the close succeeds.
357 def readChunk(offset, length):
361 If EOF is reached before any data is read, raise EOFError.
363 This method returns the data as a string, or a Deferred that is
364 called back with same.
366 @param offset: an integer that is the index to start from in the file.
367 @param length: the maximum length of data to return. The actual amount
368 returned may less than this. For normal disk files, however,
369 this should read the requested number (up to the end of the file).
372 def writeChunk(offset, data):
376 This method returns when the write completes, or a Deferred that is
377 called when it completes.
379 @param offset: an integer that is the index to start from in the file.
380 @param data: a string that is the data to write.
385 Return the attributes for the file.
387 This method returns a dictionary in the same format as the attrs
388 argument to L{openFile} or a L{Deferred} that is called back with same.
393 Set the attributes for the file.
395 This method returns when the attributes are set or a Deferred that is
396 called back when they are.
398 @param attrs: a dictionary in the same format as the attrs argument to