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""" The parent class for all the SSH Channels. Currently implemented channels are session, direct-tcp, and forwarded-tcp. Maintainer: Paul Swartz """ from __future__ import division, absolute_import from zope.interface import implementer from twisted.python import log from twisted.python.compat import nativeString, intToBytes from twisted.internet import interfaces @implementer(interfaces.ITransport) class SSHChannel(log.Logger): """ A class that represents a multiplexed channel over an SSH connection. The channel has a local window which is the maximum amount of data it will receive, and a remote which is the maximum amount of data the remote side will accept. There is also a maximum packet size for any individual data packet going each way. @ivar name: the name of the channel. @type name: L{bytes} @ivar localWindowSize: the maximum size of the local window in bytes. @type localWindowSize: L{int} @ivar localWindowLeft: how many bytes are left in the local window. @type localWindowLeft: L{int} @ivar localMaxPacket: the maximum size of packet we will accept in bytes. @type localMaxPacket: L{int} @ivar remoteWindowLeft: how many bytes are left in the remote window. @type remoteWindowLeft: L{int} @ivar remoteMaxPacket: the maximum size of a packet the remote side will accept in bytes. @type remoteMaxPacket: L{int} @ivar conn: the connection this channel is multiplexed through. @type conn: L{SSHConnection} @ivar data: any data to send to the other side when the channel is requested. @type data: L{bytes} @ivar avatar: an avatar for the logged-in user (if a server channel) @ivar localClosed: True if we aren't accepting more data. @type localClosed: L{bool} @ivar remoteClosed: True if the other side isn't accepting more data. @type remoteClosed: L{bool} """ name = None # only needed for client channels def __init__(self, localWindow = 0, localMaxPacket = 0, remoteWindow = 0, remoteMaxPacket = 0, conn = None, data=None, avatar = None): self.localWindowSize = localWindow or 131072 self.localWindowLeft = self.localWindowSize self.localMaxPacket = localMaxPacket or 32768 self.remoteWindowLeft = remoteWindow self.remoteMaxPacket = remoteMaxPacket self.areWriting = 1 self.conn = conn self.data = data self.avatar = avatar self.specificData = b'' self.buf = b'' self.extBuf = [] self.closing = 0 self.localClosed = 0 self.remoteClosed = 0 self.id = None # gets set later by SSHConnection def __str__(self): return nativeString(self.__bytes__()) def __bytes__(self): """ Return a byte string representation of the channel """ name = self.name if not name: name = b'None' return (b'') def logPrefix(self): id = (self.id is not None and str(self.id)) or "unknown" name = self.name if name: name = nativeString(name) return "SSHChannel %s (%s) on %s" % (name, id, self.conn.logPrefix()) def channelOpen(self, specificData): """ Called when the channel is opened. specificData is any data that the other side sent us when opening the channel. @type specificData: L{bytes} """ log.msg('channel open') def openFailed(self, reason): """ Called when the open failed for some reason. reason.desc is a string descrption, reason.code the SSH error code. @type reason: L{error.ConchError} """ log.msg('other side refused open\nreason: %s'% reason) def addWindowBytes(self, data): """ Called when bytes are added to the remote window. By default it clears the data buffers. @type data: L{bytes} """ self.remoteWindowLeft = self.remoteWindowLeft+data if not self.areWriting and not self.closing: self.areWriting = True self.startWriting() if self.buf: b = self.buf self.buf = b'' self.write(b) if self.extBuf: b = self.extBuf self.extBuf = [] for (type, data) in b: self.writeExtended(type, data) def requestReceived(self, requestType, data): """ Called when a request is sent to this channel. By default it delegates to self.request_. If this function returns true, the request succeeded, otherwise it failed. @type requestType: L{bytes} @type data: L{bytes} @rtype: L{bool} """ foo = nativeString(requestType.replace(b'-', b'_')) f = getattr(self, 'request_%s'%foo, None) if f: return f(data) log.msg('unhandled request for %s'%requestType) return 0 def dataReceived(self, data): """ Called when we receive data. @type data: L{bytes} """ log.msg('got data %s'%repr(data)) def extReceived(self, dataType, data): """ Called when we receive extended data (usually standard error). @type dataType: L{int} @type data: L{str} """ log.msg('got extended data %s %s'%(dataType, repr(data))) def eofReceived(self): """ Called when the other side will send no more data. """ log.msg('remote eof') def closeReceived(self): """ Called when the other side has closed the channel. """ log.msg('remote close') self.loseConnection() def closed(self): """ Called when the channel is closed. This means that both our side and the remote side have closed the channel. """ log.msg('closed') def write(self, data): """ Write some data to the channel. If there is not enough remote window available, buffer until it is. Otherwise, split the data into packets of length remoteMaxPacket and send them. @type data: L{bytes} """ if self.buf: self.buf += data return top = len(data) if top > self.remoteWindowLeft: data, self.buf = (data[:self.remoteWindowLeft], data[self.remoteWindowLeft:]) self.areWriting = 0 self.stopWriting() top = self.remoteWindowLeft rmp = self.remoteMaxPacket write = self.conn.sendData r = range(0, top, rmp) for offset in r: write(self, data[offset: offset+rmp]) self.remoteWindowLeft -= top if self.closing and not self.buf: self.loseConnection() # try again def writeExtended(self, dataType, data): """ Send extended data to this channel. If there is not enough remote window available, buffer until there is. Otherwise, split the data into packets of length remoteMaxPacket and send them. @type dataType: L{int} @type data: L{bytes} """ if self.extBuf: if self.extBuf[-1][0] == dataType: self.extBuf[-1][1] += data else: self.extBuf.append([dataType, data]) return if len(data) > self.remoteWindowLeft: data, self.extBuf = (data[:self.remoteWindowLeft], [[dataType, data[self.remoteWindowLeft:]]]) self.areWriting = 0 self.stopWriting() while len(data) > self.remoteMaxPacket: self.conn.sendExtendedData(self, dataType, data[:self.remoteMaxPacket]) data = data[self.remoteMaxPacket:] self.remoteWindowLeft -= self.remoteMaxPacket if data: self.conn.sendExtendedData(self, dataType, data) self.remoteWindowLeft -= len(data) if self.closing: self.loseConnection() # try again def writeSequence(self, data): """ Part of the Transport interface. Write a list of strings to the channel. @type data: C{list} of L{str} """ self.write(b''.join(data)) def loseConnection(self): """ Close the channel if there is no buferred data. Otherwise, note the request and return. """ self.closing = 1 if not self.buf and not self.extBuf: self.conn.sendClose(self) def getPeer(self): """ See: L{ITransport.getPeer} @return: The remote address of this connection. @rtype: L{SSHTransportAddress}. """ return self.conn.transport.getPeer() def getHost(self): """ See: L{ITransport.getHost} @return: An address describing this side of the connection. @rtype: L{SSHTransportAddress}. """ return self.conn.transport.getHost() def stopWriting(self): """ Called when the remote buffer is full, as a hint to stop writing. This can be ignored, but it can be helpful. """ def startWriting(self): """ Called when the remote buffer has more room, as a hint to continue writing. """