Fixing up some of the upload code.
parent
5ee5f63f9b
commit
03e4e74829
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@ -1,7 +1,7 @@
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import time, types
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from TftpShared import *
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from TftpPacketFactory import *
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from TftpStates import TftpContextClientDownload
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from TftpStates import TftpContextClientDownload, TftpContextClientUpload
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class TftpClient(TftpSession):
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"""This class is an implementation of a tftp client. Once instantiated, a
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@ -63,185 +63,26 @@ class TftpClient(TftpSession):
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# Open the input file.
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# FIXME: As of the state machine, this is now broken. Need to
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# implement with new state machine.
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self.fileobj = open(input, "rb")
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recvpkt = None
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curblock = 0
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start_time = time.time()
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self.bytes = 0
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self.context = TftpContextClientUpload(self.host,
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self.iport,
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filename,
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input,
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self.options,
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packethook,
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timeout)
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self.context.start()
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# Upload happens here
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self.context.end()
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tftp_factory = TftpPacketFactory()
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.sock.settimeout(timeout)
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metrics = self.context.metrics
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self.filename = filename
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self.send_wrq()
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self.state.state = 'wrq'
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timeouts = 0
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while True:
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try:
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(buffer, (raddress, rport)) = self.sock.recvfrom(MAX_BLKSIZE)
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except socket.timeout, err:
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timeouts += 1
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if timeouts >= TIMEOUT_RETRIES:
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raise TftpException, "Hit max timeouts, giving up."
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else:
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if self.state.state == 'dat' or self.state.state == 'fin':
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logger.debug("Timing out on DAT. Need to resend.")
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self.send_dat(packethook,resend=True)
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elif self.state.state == 'wrq':
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logger.debug("Timing out on WRQ.")
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self.send_wrq(resend=True)
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else:
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tftpassert(False,
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"Timing out in unsupported state %s" %
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self.state.state)
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continue
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recvpkt = tftp_factory.parse(buffer)
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logger.debug("Received %d bytes from %s:%s"
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% (len(buffer), raddress, rport))
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# Check for known "connection".
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if raddress != self.address:
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logger.warn("Received traffic from %s, expected host %s. Discarding"
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% (raddress, self.host))
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continue
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if self.port and self.port != rport:
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logger.warn("Received traffic from %s:%s but we're "
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"connected to %s:%s. Discarding."
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% (raddress, rport,
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self.host, self.port))
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continue
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if not self.port and self.state.state == 'wrq':
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self.port = rport
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logger.debug("Set remote port for session to %s" % rport)
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# Next packet type
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if isinstance(recvpkt, TftpPacketACK):
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logger.debug("Received an ACK from the server.")
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# tftp on wrt54gl seems to answer with an ack to a wrq regardless
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# if we sent options.
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if recvpkt.blocknumber == 0 and self.state.state in ('oack','wrq'):
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logger.debug("Received ACK with 0 blocknumber, starting upload")
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self.state.state = 'dat'
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self.send_dat(packethook)
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else:
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if self.state.state == 'dat' or self.state.state == 'fin':
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if self.blocknumber == recvpkt.blocknumber:
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logger.info("Received ACK for block %d"
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% recvpkt.blocknumber)
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if self.state.state == 'fin':
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break
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else:
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self.send_dat(packethook)
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elif recvpkt.blocknumber < self.blocknumber:
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# Don't resend a DAT due to an old ACK. Fixes the
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# sorceror's apprentice problem.
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logger.warn("Received old ACK for block number %d"
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% recvpkt.blocknumber)
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else:
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logger.warn("Received ACK for block number "
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"%d, apparently from the future"
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% recvpkt.blocknumber)
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else:
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logger.error("Received ACK with block number %d "
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"while in state %s"
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% (recvpkt.blocknumber,
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self.state.state))
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# Check other packet types.
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elif isinstance(recvpkt, TftpPacketOACK):
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if not self.state.state == 'wrq':
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self.errors += 1
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logger.error("Received OACK in state %s" % self.state.state)
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continue
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self.state.state = 'oack'
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logger.info("Received OACK from server.")
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if recvpkt.options.keys() > 0:
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if recvpkt.match_options(self.options):
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logger.info("Successful negotiation of options")
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for key in self.options:
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logger.info(" %s = %s" % (key, self.options[key]))
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logger.debug("sending ACK to OACK")
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ackpkt = TftpPacketACK()
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ackpkt.blocknumber = 0
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self.sock.sendto(ackpkt.encode().buffer, (self.host, self.port))
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self.state.state = 'dat'
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self.send_dat(packethook)
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else:
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logger.error("failed to negotiate options")
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self.senderror(self.sock, TftpErrors.FailedNegotiation, self.host, self.port)
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self.state.state = 'err'
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raise TftpException, "Failed to negotiate options"
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elif isinstance(recvpkt, TftpPacketERR):
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self.state.state = 'err'
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self.senderror(self.sock, TftpErrors.IllegalTftpOp, self.host, self.port)
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tftpassert(False, "Received ERR from server: " + str(recvpkt))
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elif isinstance(recvpkt, TftpPacketWRQ):
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self.state.state = 'err'
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self.senderror(self.sock, TftpErrors.IllegalTftpOp, self.host, self.port)
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tftpassert(False, "Received WRQ from server: " + str(recvpkt))
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else:
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self.state.state = 'err'
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self.senderror(self.sock, TftpErrors.IllegalTftpOp, self.host, self.port)
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tftpassert(False, "Received unknown packet type from server: "
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+ str(recvpkt))
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# end while
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self.fileobj.close()
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end_time = time.time()
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duration = end_time - start_time
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if duration == 0:
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# FIXME: Should we output this? Shouldn't we let the client control
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# output? This should be in the sample client, but not in the download
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# call.
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if metrics.duration == 0:
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logger.info("Duration too short, rate undetermined")
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else:
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logger.info('')
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logger.info("Uploaded %d bytes in %d seconds" % (self.bytes, duration))
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bps = (self.bytes * 8.0) / duration
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kbps = bps / 1024.0
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logger.info("Average rate: %.2f kbps" % kbps)
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def send_dat(self, packethook, resend=False):
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"""This method reads and sends a DAT packet based on what is in self.buffer."""
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if not resend:
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blksize = int(self.options['blksize'])
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self.buffer = self.fileobj.read(blksize)
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logger.debug("Read %d bytes into buffer" % len(self.buffer))
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if len(self.buffer) < blksize:
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logger.info("Reached EOF on file %s" % self.filename)
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self.state.state = 'fin'
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self.blocknumber += 1
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if self.blocknumber > 65535:
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logger.debug("Blocknumber rolled over to zero")
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self.blocknumber = 0
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self.bytes += len(self.buffer)
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else:
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logger.warn("Resending block number %d" % self.blocknumber)
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dat = TftpPacketDAT()
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dat.data = self.buffer
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dat.blocknumber = self.blocknumber
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logger.debug("Sending DAT packet %d" % self.blocknumber)
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self.sock.sendto(dat.encode().buffer, (self.host, self.port))
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self.timesent = time.time()
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if packethook:
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packethook(dat)
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def send_wrq(self, resend=False):
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"""This method sends a wrq"""
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logger.info("Sending tftp upload request to %s" % self.host)
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logger.info(" filename -> %s" % self.filename)
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wrq = TftpPacketWRQ()
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wrq.filename = self.filename
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wrq.mode = "octet" # FIXME - shouldn't hardcode this
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wrq.options = self.options
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self.sock.sendto(wrq.encode().buffer, (self.host, self.iport))
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logger.info("Downloaded %.2f bytes in %.2f seconds" % (metrics.bytes, metrics.duration))
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logger.info("Average rate: %.2f kbps" % metrics.kbps)
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logger.info("Received %d duplicate packets" % metrics.dupcount)
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@ -76,83 +76,37 @@ class TftpContext(object):
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ackpkt.blocknumber = blocknumber
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self.sock.sendto(ackpkt.encode().buffer, (self.host, self.tidport))
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def senderror(self, errorcode):
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def sendError(self, errorcode):
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"""This method uses the socket passed, and uses the errorcode to
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compose and send an error packet."""
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logger.debug("In senderror, being asked to send error %d" % errorcode)
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logger.debug("In sendError, being asked to send error %d" % errorcode)
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errpkt = TftpPacketERR()
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errpkt.errorcode = errorcode
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sock.sendto(errpkt.encode().buffer, (self.host, self.tidport))
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self.sock.sendto(errpkt.encode().buffer, (self.host, self.tidport))
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class TftpContextServerDownload(TftpContext):
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"""The download context for the server during a download."""
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pass
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class TftpContextClientDownload(TftpContext):
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"""The download context for the client during a download."""
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def __init__(self, host, port, filename, output, options, packethook, timeout):
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class TftpContextClient(TftpContext):
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"""This class represents shared functionality by both the download and
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upload client contexts."""
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def __init__(self, host, port, filename, options, packethook, timeout):
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TftpContext.__init__(self, host, port)
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# FIXME - need to support alternate return formats than files?
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# File-like objects would be ideal, ala duck-typing.
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self.requested_file = filename
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self.fileobj = open(output, "wb")
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self.file_to_transfer = filename
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self.options = options
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self.packethook = packethook
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.sock.settimeout(timeout)
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self.state = None
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self.expected_block = 0
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self.next_block = 0
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############################
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# Logging
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############################
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logger.debug("TftpContextClientDownload.__init__()")
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logger.debug("requested_file = %s, options = %s" %
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(self.requested_file, self.options))
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def setExpectedBlock(self, block):
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def setNextBlock(self, block):
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if block > 2 ** 16:
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logger.debug("block number rollover to 0 again")
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block = 0
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self.__eblock = block
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def getExpectedBlock(self):
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def getNextBlock(self):
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return self.__eblock
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expected_block = property(getExpectedBlock, setExpectedBlock)
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def start(self):
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"""Initiate the download."""
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logger.info("sending tftp download request to %s" % self.host)
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logger.info(" filename -> %s" % self.requested_file)
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logger.info(" options -> %s" % self.options)
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self.metrics.start_time = time.time()
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logger.debug("set metrics.start_time to %s" % self.metrics.start_time)
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# FIXME: put this in a sendRRQ method?
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pkt = TftpPacketRRQ()
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pkt.filename = self.requested_file
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pkt.mode = "octet" # FIXME - shouldn't hardcode this
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pkt.options = self.options
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self.sock.sendto(pkt.encode().buffer, (self.host, self.port))
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self.expected_block = 1
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self.state = TftpStateSentRRQ(self)
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try:
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while self.state:
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logger.debug("state is %s" % self.state)
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self.cycle()
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finally:
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self.fileobj.close()
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def end(self):
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"""Finish up the context."""
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self.metrics.end_time = time.time()
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logger.debug("set metrics.end_time to %s" % self.metrics.end_time)
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self.metrics.compute()
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next_block = property(getNextBlock, setNextBlock)
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def cycle(self):
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"""Here we wait for a response from the server after sending it
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@ -196,6 +150,101 @@ class TftpContextClientDownload(TftpContext):
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# And handle it, possibly changing state.
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self.state = self.state.handle(recvpkt, raddress, rport)
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class TftpContextClientUpload(TftpContextClient):
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"""The upload context for the client during an upload."""
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def __init__(self, host, port, filename, input, options, packethook, timeout):
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TftpContextClient.__init__(self,
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host,
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port,
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filename,
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options,
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packethook,
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timeout)
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self.fileobj = open(input, "wb")
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logger.debug("TftpContextClientUpload.__init__()")
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logger.debug("file_to_transfer = %s, options = %s" %
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(self.file_to_transfer, self.options))
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def start(self):
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logger.info("sending tftp upload request to %s" % self.host)
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logger.info(" filename -> %s" % self.file_to_transfer)
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logger.info(" options -> %s" % self.options)
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self.metrics.start_time = time.time()
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logger.debug("set metrics.start_time to %s" % self.metrics.start_time)
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# FIXME: put this in a sendWRQ method?
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pkt = TftpPacketWRQ()
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pkt.filename = self.file_to_transfer
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pkt.mode = "octet" # FIXME - shouldn't hardcode this
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pkt.options = self.options
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self.sock.sendto(pkt.encode().buffer, (self.host, self.port))
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self.next_block = 1
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self.state = TftpStateSentWRQ(self)
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try:
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while self.state:
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logger.debug("state is %s" % self.state)
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self.cycle()
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finally:
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self.fileobj.close()
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def end(self):
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pass
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class TftpContextClientDownload(TftpContextClient):
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"""The download context for the client during a download."""
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def __init__(self, host, port, filename, output, options, packethook, timeout):
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TftpContextClient.__init__(self,
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host,
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port,
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filename,
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options,
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packethook,
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timeout)
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# FIXME - need to support alternate return formats than files?
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# File-like objects would be ideal, ala duck-typing.
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self.fileobj = open(output, "wb")
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logger.debug("TftpContextClientDownload.__init__()")
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logger.debug("file_to_transfer = %s, options = %s" %
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(self.file_to_transfer, self.options))
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def start(self):
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"""Initiate the download."""
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logger.info("sending tftp download request to %s" % self.host)
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logger.info(" filename -> %s" % self.file_to_transfer)
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logger.info(" options -> %s" % self.options)
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self.metrics.start_time = time.time()
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logger.debug("set metrics.start_time to %s" % self.metrics.start_time)
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# FIXME: put this in a sendRRQ method?
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pkt = TftpPacketRRQ()
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pkt.filename = self.file_to_transfer
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pkt.mode = "octet" # FIXME - shouldn't hardcode this
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pkt.options = self.options
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self.sock.sendto(pkt.encode().buffer, (self.host, self.port))
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self.next_block = 1
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self.state = TftpStateSentRRQ(self)
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try:
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while self.state:
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logger.debug("state is %s" % self.state)
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self.cycle()
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finally:
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self.fileobj.close()
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def end(self):
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"""Finish up the context."""
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self.metrics.end_time = time.time()
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logger.debug("set metrics.end_time to %s" % self.metrics.end_time)
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self.metrics.compute()
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###############################################################################
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# State classes
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###############################################################################
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@ -214,18 +263,60 @@ class TftpState(object):
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a TftpState object, either itself or a new state."""
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raise NotImplementedError, "Abstract method"
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def handleOACK(self, pkt):
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"""This method handles an OACK from the server, syncing any accepted
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options."""
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if pkt.options.keys() > 0:
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if pkt.match_options(self.context.options):
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logger.info("Successful negotiation of options")
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# Set options to OACK options
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self.context.options = pkt.options
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for key in self.context.options:
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logger.info(" %s = %s" % (key, self.context.options[key]))
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else:
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logger.error("failed to negotiate options")
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raise TftpException, "Failed to negotiate options"
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else:
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raise TftpException, "No options found in OACK"
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class TftpStateUpload(TftpState):
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"""A class holding common code for upload states."""
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def sendDat(self, resend=False):
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finished = False
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blocknumber = self.context.next_block
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if not resend:
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blksize = int(self.context.options['blksize'])
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buffer = self.context.fileobj.read(blksize)
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logger.debug("Read %d bytes into buffer" % len(buffer))
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if len(buffer) < blksize:
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logger.info("Reached EOF on file %s" % self.context.input)
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finished = True
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self.context.next_block += 1
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self.bytes += len(buffer)
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else:
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logger.warn("Resending block number %d" % blocknumber)
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dat = TftpPacketDAT()
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dat.data = buffer
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dat.blocknumber = blocknumber
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logger.debug("Sending DAT packet %d" % blocknumber)
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self.context.sock.sendto(dat.encode().buffer,
|
||||
(self.context.host, self.context.port))
|
||||
if self.context.packethook:
|
||||
self.context.packethook(dat)
|
||||
return finished
|
||||
|
||||
class TftpStateDownload(TftpState):
|
||||
"""A class holding common code for download states."""
|
||||
def handleDat(self, pkt):
|
||||
"""This method handles a DAT packet during a download."""
|
||||
logger.info("handling DAT packet - block %d" % pkt.blocknumber)
|
||||
logger.debug("expecting block %s" % self.context.expected_block)
|
||||
if pkt.blocknumber == self.context.expected_block:
|
||||
logger.debug("expecting block %s" % self.context.next_block)
|
||||
if pkt.blocknumber == self.context.next_block:
|
||||
logger.debug("good, received block %d in sequence"
|
||||
% pkt.blocknumber)
|
||||
|
||||
self.context.sendAck(pkt.blocknumber)
|
||||
self.context.expected_block += 1
|
||||
self.context.next_block += 1
|
||||
|
||||
logger.debug("writing %d bytes to output file"
|
||||
% len(pkt.data))
|
||||
|
@ -236,7 +327,7 @@ class TftpStateDownload(TftpState):
|
|||
logger.info("end of file detected")
|
||||
return None
|
||||
|
||||
elif pkt.blocknumber < self.context.expected_block:
|
||||
elif pkt.blocknumber < self.context.next_block:
|
||||
logger.warn("dropping duplicate block %d" % pkt.blocknumber)
|
||||
if self.context.metrics.dups.has_key(pkt.blocknumber):
|
||||
self.context.metrics.dups[pkt.blocknumber] += 1
|
||||
|
@ -251,16 +342,87 @@ class TftpStateDownload(TftpState):
|
|||
else:
|
||||
# FIXME: should we be more tolerant and just discard instead?
|
||||
msg = "Whoa! Received future block %d but expected %d" \
|
||||
% (pkt.blocknumber, self.context.expected_block)
|
||||
% (pkt.blocknumber, self.context.next_block)
|
||||
logger.error(msg)
|
||||
raise TftpException, msg
|
||||
|
||||
# Default is to ack
|
||||
return TftpStateSentACK(self.context)
|
||||
|
||||
class TftpStateSentWRQ(TftpStateUpload):
|
||||
"""Just sent an WRQ packet for an upload."""
|
||||
def handle(self, pkt, raddress, rport):
|
||||
"""Handle a packet we just received."""
|
||||
if not self.context.tidport:
|
||||
self.context.tidport = rport
|
||||
logger.debug("Set remote port for session to %s" % rport)
|
||||
|
||||
# If we're going to successfully transfer the file, then we should see
|
||||
# either an OACK for accepted options, or an ACK to ignore options.
|
||||
if isinstance(pkt, TftpPacketOACK):
|
||||
logger.info("received OACK from server")
|
||||
try:
|
||||
self.handleOACK(pkt)
|
||||
except TftpException, err:
|
||||
logger.error("failed to negotiate options")
|
||||
self.context.sendError(TftpErrors.FailedNegotiation)
|
||||
raise
|
||||
else:
|
||||
logger.debug("sending first DAT packet")
|
||||
fin = self.context.sendDat()
|
||||
if fin:
|
||||
logger.info("Add done")
|
||||
return None
|
||||
else:
|
||||
logger.debug("Changing state to TftpStateSentDAT")
|
||||
return TftpStateSentDAT(self.context)
|
||||
|
||||
elif isinstance(pkt, TftpPacketACK):
|
||||
logger.info("received ACK from server")
|
||||
logger.debug("apparently the server ignored our options")
|
||||
# The block number should be zero.
|
||||
if pkt.blocknumber == 0:
|
||||
logger.debug("ack blocknumber is zero as expected")
|
||||
logger.debug("sending first DAT packet")
|
||||
fin = self.context.sendDat()
|
||||
if fin:
|
||||
logger.info("Add done")
|
||||
return None
|
||||
else:
|
||||
logger.debug("Changing state to TftpStateSentDAT")
|
||||
return TftpStateSentDAT(self.context)
|
||||
else:
|
||||
logger.warn("discarding ACK to block %s" % pkt.blocknumber)
|
||||
logger.debug("still waiting for valid response from server")
|
||||
return self
|
||||
|
||||
elif isinstance(pkt, TftpPacketERR):
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received ERR from server: " + str(pkt)
|
||||
|
||||
elif isinstance(pkt, TftpPacketRRQ):
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received RRQ from server while in upload"
|
||||
|
||||
elif isinstance(pkt, TftpPacketDAT):
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received DAT from server while in upload"
|
||||
|
||||
else:
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received unknown packet type from server: " + str(pkt)
|
||||
|
||||
# By default, no state change.
|
||||
return self
|
||||
|
||||
class TftpStateSentDAT(TftpStateUpload):
|
||||
"""This class represents the state of the transfer when a DAT was just
|
||||
sent, and we are waiting for an ACK from the server. This class is the
|
||||
same one used by the client during the upload, and the server during the
|
||||
download."""
|
||||
|
||||
class TftpStateSentRRQ(TftpStateDownload):
|
||||
"""Just sent an RRQ packet."""
|
||||
|
||||
def handle(self, pkt, raddress, rport):
|
||||
"""Handle the packet in response to an RRQ to the server."""
|
||||
if not self.context.tidport:
|
||||
|
@ -269,24 +431,20 @@ class TftpStateSentRRQ(TftpStateDownload):
|
|||
|
||||
# Now check the packet type and dispatch it properly.
|
||||
if isinstance(pkt, TftpPacketOACK):
|
||||
logger.info("received OACK from server.")
|
||||
if pkt.options.keys() > 0:
|
||||
if pkt.match_options(self.context.options):
|
||||
logger.info("Successful negotiation of options")
|
||||
# Set options to OACK options
|
||||
self.context.options = pkt.options
|
||||
for key in self.context.options:
|
||||
logger.info(" %s = %s" % (key, self.context.options[key]))
|
||||
logger.info("received OACK from server")
|
||||
try:
|
||||
self.handleOACK(pkt)
|
||||
except TftpException, err:
|
||||
logger.error("failed to negotiate options: %s" % str(err))
|
||||
self.context.sendError(TftpErrors.FailedNegotiation)
|
||||
raise
|
||||
else:
|
||||
logger.debug("sending ACK to OACK")
|
||||
|
||||
self.context.sendAck(blocknumber=0)
|
||||
|
||||
logger.debug("Changing state to TftpStateSentACK")
|
||||
return TftpStateSentACK(self.context)
|
||||
else:
|
||||
logger.error("failed to negotiate options")
|
||||
self.senderror(self.sock, TftpErrors.FailedNegotiation, self.host, self.port)
|
||||
raise TftpException, "Failed to negotiate options"
|
||||
|
||||
elif isinstance(pkt, TftpPacketDAT):
|
||||
# If there are any options set, then the server didn't honour any
|
||||
|
@ -300,19 +458,19 @@ class TftpStateSentRRQ(TftpStateDownload):
|
|||
# Every other packet type is a problem.
|
||||
elif isinstance(recvpkt, TftpPacketACK):
|
||||
# Umm, we ACK, the server doesn't.
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received ACK from server while in download"
|
||||
|
||||
elif isinstance(recvpkt, TftpPacketWRQ):
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received WRQ from server while in download"
|
||||
|
||||
elif isinstance(recvpkt, TftpPacketERR):
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received ERR from server: " + str(recvpkt)
|
||||
|
||||
else:
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received unknown packet type from server: " + str(recvpkt)
|
||||
|
||||
# By default, no state change.
|
||||
|
@ -328,17 +486,17 @@ class TftpStateSentACK(TftpStateDownload):
|
|||
# Every other packet type is a problem.
|
||||
elif isinstance(recvpkt, TftpPacketACK):
|
||||
# Umm, we ACK, the server doesn't.
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received ACK from server while in download"
|
||||
|
||||
elif isinstance(recvpkt, TftpPacketWRQ):
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received WRQ from server while in download"
|
||||
|
||||
elif isinstance(recvpkt, TftpPacketERR):
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received ERR from server: " + str(recvpkt)
|
||||
|
||||
else:
|
||||
self.senderror(self.sock, TftpErrors.IllegalTftpOp)
|
||||
self.context.sendError(TftpErrors.IllegalTftpOp)
|
||||
raise TftpException, "Received unknown packet type from server: " + str(recvpkt)
|
||||
|
|
Reference in New Issue