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"""This module implements the TFTP Client functionality. Instantiate an
instance of the client, and then use its upload or download method. Logging is
performed via a standard logging object set in TftpShared."""
import time, types
from TftpShared import *
from TftpPacketFactory import *
from TftpStates import TftpContextClientDownload, TftpContextClientUpload
class TftpClient(TftpSession):
"""This class is an implementation of a tftp client. Once instantiated, a
download can be initiated via the download() method, or an upload via the
upload() method."""
def __init__(self, host, port, options={}):
TftpSession.__init__(self)
self.context = None
self.host = host
self.iport = port
self.filename = None
self.options = options
# FIXME: If the blksize is DEF_BLKSIZE, we should just skip sending
# it.
if self.options.has_key('blksize'):
size = self.options['blksize']
tftpassert(types.IntType == type(size), "blksize must be an int")
if size < MIN_BLKSIZE or size > MAX_BLKSIZE:
raise TftpException, "Invalid blksize: %d" % size
else:
self.options['blksize'] = DEF_BLKSIZE
def download(self, filename, output, packethook=None, timeout=SOCK_TIMEOUT):
"""This method initiates a tftp download from the configured remote
host, requesting the filename passed. It saves the file to a local
file specified in the output parameter. If a packethook is provided,
it must be a function that takes a single parameter, which will be a
copy of each DAT packet received in the form of a TftpPacketDAT
object. The timeout parameter may be used to override the default
SOCK_TIMEOUT setting, which is the amount of time that the client will
wait for a receive packet to arrive.
Note: If output is a hyphen then stdout is used."""
# We're downloading.
log.debug("Creating download context with the following params:")
log.debug("host = %s, port = %s, filename = %s, output = %s"
% (self.host, self.iport, filename, output))
log.debug("options = %s, packethook = %s, timeout = %s"
% (self.options, packethook, timeout))
self.context = TftpContextClientDownload(self.host,
self.iport,
filename,
output,
self.options,
packethook,
timeout)
self.context.start()
# Download happens here
self.context.end()
metrics = self.context.metrics
log.info('')
log.info("Download complete.")
if metrics.duration == 0:
log.info("Duration too short, rate undetermined")
else:
log.info("Downloaded %.2f bytes in %.2f seconds" % (metrics.bytes, metrics.duration))
log.info("Average rate: %.2f kbps" % metrics.kbps)
log.info("%.2f bytes in resent data" % metrics.resent_bytes)
log.info("Received %d duplicate packets" % metrics.dupcount)
def upload(self, filename, input, packethook=None, timeout=SOCK_TIMEOUT):
"""This method initiates a tftp upload to the configured remote host,
uploading the filename passed. If a packethook is provided, it must
be a function that takes a single parameter, which will be a copy of
each DAT packet sent in the form of a TftpPacketDAT object. The
timeout parameter may be used to override the default SOCK_TIMEOUT
setting, which is the amount of time that the client will wait for a
DAT packet to be ACKd by the server.
Note: If output is a hyphen then stdout is used."""
# Open the input file.
# FIXME: As of the state machine, this is now broken. Need to
# implement with new state machine.
self.context = TftpContextClientUpload(self.host,
self.iport,
filename,
input,
self.options,
packethook,
timeout)
self.context.start()
# Upload happens here
self.context.end()
metrics = self.context.metrics
log.info('')
log.info("Upload complete.")
if metrics.duration == 0:
log.info("Duration too short, rate undetermined")
else:
log.info("Uploaded %d bytes in %.2f seconds" % (metrics.bytes, metrics.duration))
log.info("Average rate: %.2f kbps" % metrics.kbps)
log.info("%.2f bytes in resent data" % metrics.resent_bytes)
log.info("Resent %d packets" % metrics.dupcount)
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