/usr/lib/python2.7/dist-packages/billiard/py2/connection.py is in python-billiard 3.3.0.22-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# A higher level module for using sockets (or Windows named pipes)
#
# multiprocessing/connection.py
#
# Copyright (c) 2006-2008, R Oudkerk
# Licensed to PSF under a Contributor Agreement.
#
from __future__ import absolute_import
import os
import random
import sys
import socket
import string
import errno
import time
import tempfile
import itertools
from .. import AuthenticationError
from .. import reduction
from .._ext import _billiard, win32
from ..compat import get_errno, setblocking, bytes as cbytes
from ..five import monotonic
from ..forking import duplicate, close
from ..reduction import ForkingPickler
from ..util import get_temp_dir, Finalize, sub_debug, debug
try:
WindowsError = WindowsError # noqa
except NameError:
WindowsError = None # noqa
__all__ = ['Client', 'Listener', 'Pipe']
# global set later
xmlrpclib = None
Connection = getattr(_billiard, 'Connection', None)
PipeConnection = getattr(_billiard, 'PipeConnection', None)
#
#
#
BUFSIZE = 8192
# A very generous timeout when it comes to local connections...
CONNECTION_TIMEOUT = 20.
_mmap_counter = itertools.count()
default_family = 'AF_INET'
families = ['AF_INET']
if hasattr(socket, 'AF_UNIX'):
default_family = 'AF_UNIX'
families += ['AF_UNIX']
if sys.platform == 'win32':
default_family = 'AF_PIPE'
families += ['AF_PIPE']
def _init_timeout(timeout=CONNECTION_TIMEOUT):
return monotonic() + timeout
def _check_timeout(t):
return monotonic() > t
#
#
#
def arbitrary_address(family):
'''
Return an arbitrary free address for the given family
'''
if family == 'AF_INET':
return ('localhost', 0)
elif family == 'AF_UNIX':
return tempfile.mktemp(prefix='listener-', dir=get_temp_dir())
elif family == 'AF_PIPE':
randomchars = ''.join(
random.choice(string.ascii_lowercase + string.digits)
for i in range(6)
)
return r'\\.\pipe\pyc-%d-%d-%s' % (
os.getpid(), next(_mmap_counter), randomchars
)
else:
raise ValueError('unrecognized family')
def address_type(address):
'''
Return the types of the address
This can be 'AF_INET', 'AF_UNIX', or 'AF_PIPE'
'''
if type(address) == tuple:
return 'AF_INET'
elif type(address) is str and address.startswith('\\\\'):
return 'AF_PIPE'
elif type(address) is str:
return 'AF_UNIX'
else:
raise ValueError('address type of %r unrecognized' % address)
#
# Public functions
#
class Listener(object):
'''
Returns a listener object.
This is a wrapper for a bound socket which is 'listening' for
connections, or for a Windows named pipe.
'''
def __init__(self, address=None, family=None, backlog=1, authkey=None):
family = (family or
(address and address_type(address)) or
default_family)
address = address or arbitrary_address(family)
if family == 'AF_PIPE':
self._listener = PipeListener(address, backlog)
else:
self._listener = SocketListener(address, family, backlog)
if authkey is not None and not isinstance(authkey, bytes):
raise TypeError('authkey should be a byte string')
self._authkey = authkey
def accept(self):
'''
Accept a connection on the bound socket or named pipe of `self`.
Returns a `Connection` object.
'''
if self._listener is None:
raise IOError('listener is closed')
c = self._listener.accept()
if self._authkey:
deliver_challenge(c, self._authkey)
answer_challenge(c, self._authkey)
return c
def close(self):
'''
Close the bound socket or named pipe of `self`.
'''
if self._listener is not None:
self._listener.close()
self._listener = None
address = property(lambda self: self._listener._address)
last_accepted = property(lambda self: self._listener._last_accepted)
def __enter__(self):
return self
def __exit__(self, *exc_args):
self.close()
def Client(address, family=None, authkey=None):
'''
Returns a connection to the address of a `Listener`
'''
family = family or address_type(address)
if family == 'AF_PIPE':
c = PipeClient(address)
else:
c = SocketClient(address)
if authkey is not None and not isinstance(authkey, bytes):
raise TypeError('authkey should be a byte string')
if authkey is not None:
answer_challenge(c, authkey)
deliver_challenge(c, authkey)
return c
if sys.platform != 'win32':
def Pipe(duplex=True, rnonblock=False, wnonblock=False):
'''
Returns pair of connection objects at either end of a pipe
'''
if duplex:
s1, s2 = socket.socketpair()
s1.setblocking(not rnonblock)
s2.setblocking(not wnonblock)
c1 = Connection(os.dup(s1.fileno()))
c2 = Connection(os.dup(s2.fileno()))
s1.close()
s2.close()
else:
fd1, fd2 = os.pipe()
if rnonblock:
setblocking(fd1, 0)
if wnonblock:
setblocking(fd2, 0)
c1 = Connection(fd1, writable=False)
c2 = Connection(fd2, readable=False)
return c1, c2
else:
def Pipe(duplex=True, rnonblock=False, wnonblock=False): # noqa
'''
Returns pair of connection objects at either end of a pipe
'''
address = arbitrary_address('AF_PIPE')
if duplex:
openmode = win32.PIPE_ACCESS_DUPLEX
access = win32.GENERIC_READ | win32.GENERIC_WRITE
obsize, ibsize = BUFSIZE, BUFSIZE
else:
openmode = win32.PIPE_ACCESS_INBOUND
access = win32.GENERIC_WRITE
obsize, ibsize = 0, BUFSIZE
h1 = win32.CreateNamedPipe(
address, openmode,
win32.PIPE_TYPE_MESSAGE | win32.PIPE_READMODE_MESSAGE |
win32.PIPE_WAIT,
1, obsize, ibsize, win32.NMPWAIT_WAIT_FOREVER, win32.NULL
)
h2 = win32.CreateFile(
address, access, 0, win32.NULL, win32.OPEN_EXISTING, 0, win32.NULL
)
win32.SetNamedPipeHandleState(
h2, win32.PIPE_READMODE_MESSAGE, None, None
)
try:
win32.ConnectNamedPipe(h1, win32.NULL)
except WindowsError as exc:
if exc.args[0] != win32.ERROR_PIPE_CONNECTED:
raise
c1 = PipeConnection(h1, writable=duplex)
c2 = PipeConnection(h2, readable=duplex)
return c1, c2
#
# Definitions for connections based on sockets
#
class SocketListener(object):
'''
Representation of a socket which is bound to an address and listening
'''
def __init__(self, address, family, backlog=1):
self._socket = socket.socket(getattr(socket, family))
try:
# SO_REUSEADDR has different semantics on Windows (Issue #2550).
if os.name == 'posix':
self._socket.setsockopt(socket.SOL_SOCKET,
socket.SO_REUSEADDR, 1)
self._socket.bind(address)
self._socket.listen(backlog)
self._address = self._socket.getsockname()
except OSError:
self._socket.close()
raise
self._family = family
self._last_accepted = None
if family == 'AF_UNIX':
self._unlink = Finalize(
self, os.unlink, args=(address,), exitpriority=0
)
else:
self._unlink = None
def accept(self):
s, self._last_accepted = self._socket.accept()
fd = duplicate(s.fileno())
conn = Connection(fd)
s.close()
return conn
def close(self):
self._socket.close()
if self._unlink is not None:
self._unlink()
def SocketClient(address):
'''
Return a connection object connected to the socket given by `address`
'''
family = address_type(address)
s = socket.socket(getattr(socket, family))
t = _init_timeout()
while 1:
try:
s.connect(address)
except socket.error as exc:
if get_errno(exc) != errno.ECONNREFUSED or _check_timeout(t):
debug('failed to connect to address %s', address)
raise
time.sleep(0.01)
else:
break
else:
raise
fd = duplicate(s.fileno())
conn = Connection(fd)
s.close()
return conn
#
# Definitions for connections based on named pipes
#
if sys.platform == 'win32':
class PipeListener(object):
'''
Representation of a named pipe
'''
def __init__(self, address, backlog=None):
self._address = address
handle = win32.CreateNamedPipe(
address, win32.PIPE_ACCESS_DUPLEX,
win32.PIPE_TYPE_MESSAGE | win32.PIPE_READMODE_MESSAGE |
win32.PIPE_WAIT,
win32.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
win32.NMPWAIT_WAIT_FOREVER, win32.NULL
)
self._handle_queue = [handle]
self._last_accepted = None
sub_debug('listener created with address=%r', self._address)
self.close = Finalize(
self, PipeListener._finalize_pipe_listener,
args=(self._handle_queue, self._address), exitpriority=0
)
def accept(self):
newhandle = win32.CreateNamedPipe(
self._address, win32.PIPE_ACCESS_DUPLEX,
win32.PIPE_TYPE_MESSAGE | win32.PIPE_READMODE_MESSAGE |
win32.PIPE_WAIT,
win32.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
win32.NMPWAIT_WAIT_FOREVER, win32.NULL
)
self._handle_queue.append(newhandle)
handle = self._handle_queue.pop(0)
try:
win32.ConnectNamedPipe(handle, win32.NULL)
except WindowsError as exc:
if exc.args[0] != win32.ERROR_PIPE_CONNECTED:
raise
return PipeConnection(handle)
@staticmethod
def _finalize_pipe_listener(queue, address):
sub_debug('closing listener with address=%r', address)
for handle in queue:
close(handle)
def PipeClient(address):
'''
Return a connection object connected to the pipe given by `address`
'''
t = _init_timeout()
while 1:
try:
win32.WaitNamedPipe(address, 1000)
h = win32.CreateFile(
address, win32.GENERIC_READ | win32.GENERIC_WRITE,
0, win32.NULL, win32.OPEN_EXISTING, 0, win32.NULL,
)
except WindowsError as exc:
if exc.args[0] not in (
win32.ERROR_SEM_TIMEOUT,
win32.ERROR_PIPE_BUSY) or _check_timeout(t):
raise
else:
break
else:
raise
win32.SetNamedPipeHandleState(
h, win32.PIPE_READMODE_MESSAGE, None, None
)
return PipeConnection(h)
#
# Authentication stuff
#
MESSAGE_LENGTH = 20
CHALLENGE = cbytes('#CHALLENGE#', 'ascii')
WELCOME = cbytes('#WELCOME#', 'ascii')
FAILURE = cbytes('#FAILURE#', 'ascii')
def deliver_challenge(connection, authkey):
import hmac
assert isinstance(authkey, bytes)
message = os.urandom(MESSAGE_LENGTH)
connection.send_bytes(CHALLENGE + message)
digest = hmac.new(authkey, message).digest()
response = connection.recv_bytes(256) # reject large message
if response == digest:
connection.send_bytes(WELCOME)
else:
connection.send_bytes(FAILURE)
raise AuthenticationError('digest received was wrong')
def answer_challenge(connection, authkey):
import hmac
assert isinstance(authkey, bytes)
message = connection.recv_bytes(256) # reject large message
assert message[:len(CHALLENGE)] == CHALLENGE, 'message = %r' % message
message = message[len(CHALLENGE):]
digest = hmac.new(authkey, message).digest()
connection.send_bytes(digest)
response = connection.recv_bytes(256) # reject large message
if response != WELCOME:
raise AuthenticationError('digest sent was rejected')
#
# Support for using xmlrpclib for serialization
#
class ConnectionWrapper(object):
def __init__(self, conn, dumps, loads):
self._conn = conn
self._dumps = dumps
self._loads = loads
for attr in ('fileno', 'close', 'poll', 'recv_bytes', 'send_bytes'):
obj = getattr(conn, attr)
setattr(self, attr, obj)
def send(self, obj):
s = self._dumps(obj)
self._conn.send_bytes(s)
def recv(self):
s = self._conn.recv_bytes()
return self._loads(s)
def _xml_dumps(obj):
return xmlrpclib.dumps((obj,), None, None, None, 1).encode('utf8')
def _xml_loads(s):
(obj,), method = xmlrpclib.loads(s.decode('utf8'))
return obj
class XmlListener(Listener):
def accept(self):
global xmlrpclib
import xmlrpclib # noqa
obj = Listener.accept(self)
return ConnectionWrapper(obj, _xml_dumps, _xml_loads)
def XmlClient(*args, **kwds):
global xmlrpclib
import xmlrpclib # noqa
return ConnectionWrapper(Client(*args, **kwds), _xml_dumps, _xml_loads)
if sys.platform == 'win32':
ForkingPickler.register(socket.socket, reduction.reduce_socket)
ForkingPickler.register(Connection, reduction.reduce_connection)
ForkingPickler.register(PipeConnection, reduction.reduce_pipe_connection)
else:
ForkingPickler.register(socket.socket, reduction.reduce_socket)
ForkingPickler.register(Connection, reduction.reduce_connection)
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