/usr/lib/python2.7/dist-packages/sftpcloudfs/scp.py is in sftpcloudfs 0.12.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import optparse
import posixpath
import socket
import threading
from ftpcloudfs.fs import IOSError, parse_fspath
class SCPException(Exception):
def __init__(self, status, message):
self.status = status
super(Exception, self).__init__(message)
class SCPHandler(threading.Thread):
CHUNK_SIZE = 64*1024
TIMEOUT = 30.0 # seconds
def __init__(self, arguments, channel, fs, log):
super(SCPHandler, self).__init__()
self.log = log
self.channel = channel
self.channel.settimeout(self.TIMEOUT)
self.fs = fs
self.args = arguments
self.buffer = ""
@classmethod
def get_argparser(cls):
parser = optparse.OptionParser(
prog='scp',
description='Remote part of secure copy tool'
)
parser.add_option('-v', action='count', dest='verbose',
help='makes SCP verbose')
parser.add_option('-t', action='store_true', dest='copy_to')
parser.add_option('-f', action='store_true', dest='copy_from')
parser.add_option('-r', action='store_true', dest='recursive',
help='Recursively copy entire directories.')
# unused
parser.add_option('-p', action='store_true', dest='preserve',
help='Preserves modification times, access '
'times, and modes from the original file.')
parser.add_option('-d', action='store_true', dest='directory',
help='Target should be a directory')
parser.add_option('-E', action='store_true', dest='xargs',
help='Target should be a directory')
def ap_exit(status=0, message=""):
raise SCPException(status, message)
parser.exit = ap_exit
parser.error = lambda msg: ap_exit(2, msg)
return parser
def run(self):
try:
self.args, self.paths = SCPHandler.get_argparser().parse_args(self.args)
self.log.debug("SCP %r", self.args)
if self.args.copy_to and self.args.copy_from:
raise SCPException(4, "-t and -f can't be combined")
if len(self.paths) != 1:
raise SCPException(4, "scp takes exactly one path")
if self.args.copy_to:
self.receive()
elif self.args.copy_from:
path = self.paths[0]
try:
path_stat = self.fs.stat(path)
except IOSError, ex:
raise SCPException(1, ex)
self.send(path, path_stat)
else:
raise SCPException(4, "Missing -t or -f argument")
except SCPException, ex:
self.log.info("SCP reject: %s", ex)
self.send_status_and_close(msg=ex, status=ex.status)
except socket.timeout:
self.log.info("SCP timeout")
self.send_status_and_close(msg="%ss timeout" % self.TIMEOUT, status=1)
except:
self.log.exception("SCP internal exception")
self.send_status_and_close(msg="internal error", status=1)
else:
self.send_status_and_close()
def send_status_and_close(self, msg=None, status=0):
try:
if msg:
self.channel.sendall('\x01scp: ')
self.channel.sendall(str(msg))
self.channel.sendall('\n')
self.channel.send_exit_status(status)
except socket.error, ex:
self.log.warn("Failed to properly close the channel: %r" % ex.message)
finally:
try:
self.channel.close()
except socket.error:
pass
def recv(self, size):
if self.buffer:
result = self.buffer[:size]
self.buffer = self.buffer[size:]
return result
return self.channel.recv(size)
def recv_line(self):
if '\n' not in self.buffer:
while True:
chunk = self.channel.recv(1024)
self.buffer += chunk
if '\n' in chunk:
break
line, self.buffer = self.buffer.split('\n', 1)
return line
def receive(self):
# Ack the connection
self.channel.send('\x00')
if self.args.directory:
directory = self.paths[0]
filename = None
else:
directory, filename = posixpath.split(self.paths[0])
if not self.fs.isdir(directory):
raise SCPException(1, '%s is not a directory' % directory)
record = self.recv_line()
self.receive_inner(directory, record, override_name=filename)
def receive_inner(self, path, record, override_name=None):
if record[0] == 'T':
# We're going to ignore this record, but for compatibility, we'll
# confirm its arrival.
# mtime, mtime_u, atime, atime_u = record[1:].split()
# mtime = float(mtime) + float(mtime_u) / 100000
# atime = float(atime) + float(atime_u) / 100000
# ACK this file record
self.channel.send('\x00')
record = self.recv_line()
elif record[0] == 'C':
mode, size, name = record[1:].split(' ', 2)
try:
size = int(size)
except ValueError:
raise SCPException(1, 'invalid size')
target_path = path.rstrip('/') + '/' + (override_name or name)
if self.fs.isdir(target_path):
raise SCPException(1, '%s: directory exists' % target_path)
# we can't create files on the root, only inside a container
if not all(parse_fspath(target_path)):
raise SCPException(1, "%s: container required" % target_path)
# ACK this file record
self.channel.send('\x00')
fd = self.fs.open(target_path, 'w')
bytes_sent = 0
while bytes_sent < size:
chunk = self.recv(self.CHUNK_SIZE)
fd.write(chunk)
bytes_sent += len(chunk)
fd.close()
# ACK sending this file
self.channel.send('\x00')
#self.wait_for_ack()
elif record[0] == 'D':
mode, size, name = record[1:].split(' ', 2)
target_path = path.rstrip('/') + '/' + (override_name or name)
if self.fs.isfile(target_path):
raise SCPException(1, '%s: file exists', target_path)
# ACK this directory record
self.channel.send('\x00')
self.fs.mkdir(target_path)
while True:
record = self.recv_line()
if record[0] == 'E':
# ACK this file record
self.channel.send('\x00')
break
else:
self.receive_inner(target_path, record)
def send(self, path, path_stat):
self.log.debug('About to send %s', path)
if self.args.preserve:
self.channel.sendall("T%i 0 %i 0\n" % (
path_stat.st_mtime,
path_stat.st_atime))
self.wait_for_ack()
if stat.S_ISREG(path_stat.st_mode):
self.channel.sendall("C%04o %i %s\n" % (
path_stat.st_mode & 07777,
path_stat.st_size,
posixpath.basename(path)))
self.wait_for_ack()
fd = self.fs.open(path, 'r')
while True:
chunk = fd.read(self.CHUNK_SIZE)
if chunk:
self.channel.sendall(chunk)
else:
break
# signal the end of the transfer
self.channel.send('\x00')
self.wait_for_ack()
elif not self.args.recursive:
self.channel.sendall("scp: %s is not a regular file\n" % path)
return 1
else:
self.channel.send("D%04o %i %s\n" % (
path_stat.st_mode & 07777,
0,
posixpath.basename(path)))
self.wait_for_ack()
for subpath, subpath_stat in self.fs.listdir_with_stat(path):
subpath = path + "/" + subpath
self.send_inner(subpath, subpath_stat)
self.channel.send("E\n")
self.wait_for_ack()
def wait_for_ack(self):
""" Wait for the ack byte """
ack = self.channel.recv(1)
if ack != '\x00':
raise Exception("Command not acknowledged (%r)" % ack)
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