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Edit File : connection.py \| Size : 14.66 KB
# # A higher level module for using sockets (or Windows named pipes) # # multiprocessing/connection.py # # Copyright (c) 2006-2008, R Oudkerk # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # 3. Neither the name of author nor the names of any contributors may be # used to endorse or promote products derived from this software # without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # SUCH DAMAGE. # __all__ = [ 'Client', 'Listener', 'Pipe' ] import os import sys import socket import errno import time import tempfile import itertools import _multiprocessing from multiprocessing import current_process, AuthenticationError from multiprocessing.util import get_temp_dir, Finalize, sub_debug, debug from multiprocessing.forking import duplicate, close # # # BUFSIZE = 8192 # A very generous timeout when it comes to local connections... CONNECTION_TIMEOUT = 20. # The hmac module implicitly defaults to using MD5. # Support using a stronger algorithm for the challenge/response code: HMAC_DIGEST_NAME='sha256' _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 time.time() + timeout def _check_timeout(t): return time.time() > 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': return tempfile.mktemp(prefix=r'\\.\pipe\pyc-%d-%d-' % (os.getpid(), _mmap_counter.next()), dir="") 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. ''' 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`. ''' return self._listener.close() address = property(lambda self: self._listener._address) last_accepted = property(lambda self: self._listener._last_accepted) 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): ''' Returns pair of connection objects at either end of a pipe ''' if duplex: s1, s2 = socket.socketpair() s1.setblocking(True) s2.setblocking(True) c1 = _multiprocessing.Connection(os.dup(s1.fileno())) c2 = _multiprocessing.Connection(os.dup(s2.fileno())) s1.close() s2.close() else: fd1, fd2 = os.pipe() c1 = _multiprocessing.Connection(fd1, writable=False) c2 = _multiprocessing.Connection(fd2, readable=False) return c1, c2 else: from _multiprocessing import win32 def Pipe(duplex=True): ''' 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, e: if e.args[0] != win32.ERROR_PIPE_CONNECTED: raise c1 = _multiprocessing.PipeConnection(h1, writable=duplex) c2 = _multiprocessing.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: self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) self._socket.setblocking(True) self._socket.bind(address) self._socket.listen(backlog) self._address = self._socket.getsockname() except socket.error: 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): while True: try: s, self._last_accepted = self._socket.accept() except socket.error as e: if e.args[0] != errno.EINTR: raise else: break s.setblocking(True) fd = duplicate(s.fileno()) conn = _multiprocessing.Connection(fd) s.close() return conn def close(self): try: self._socket.close() finally: unlink = self._unlink if unlink is not None: self._unlink = None unlink() def SocketClient(address): ''' Return a connection object connected to the socket given by `address` ''' family = getattr(socket, address_type(address)) t = _init_timeout() while 1: s = socket.socket(family) s.setblocking(True) try: s.connect(address) except socket.error, e: s.close() if e.args[0] != 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 = _multiprocessing.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, e: # ERROR_NO_DATA can occur if a client has already connected, # written data and then disconnected -- see Issue 14725. if e.args[0] not in (win32.ERROR_PIPE_CONNECTED, win32.ERROR_NO_DATA): raise return _multiprocessing.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, e: if e.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 _multiprocessing.PipeConnection(h) # # Authentication stuff # MESSAGE_LENGTH = 20 CHALLENGE = b'#CHALLENGE#' WELCOME = b'#WELCOME#' FAILURE = b'#FAILURE#' def get_digestmod_for_hmac(): import hashlib return getattr(hashlib, HMAC_DIGEST_NAME) 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, get_digestmod_for_hmac()).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, get_digestmod_for_hmac()).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) def _xml_loads(s): (obj,), method = xmlrpclib.loads(s) return obj class XmlListener(Listener): def accept(self): global xmlrpclib import xmlrpclib obj = Listener.accept(self) return ConnectionWrapper(obj, _xml_dumps, _xml_loads) def XmlClient(args, kwds): global xmlrpclib import xmlrpclib return ConnectionWrapper(Client(args, **kwds), _xml_dumps, _xml_loads) Back

Edit File : connection.py | Size : 14.66 KB

#
# A higher level module for using sockets (or Windows named pipes)
#
# multiprocessing/connection.py
#
# Copyright (c) 2006-2008, R Oudkerk
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of author nor the names of any contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

__all__ = [ 'Client', 'Listener', 'Pipe' ]

import os
import sys
import socket
import errno
import time
import tempfile
import itertools

import _multiprocessing
from multiprocessing import current_process, AuthenticationError
from multiprocessing.util import get_temp_dir, Finalize, sub_debug, debug
from multiprocessing.forking import duplicate, close

#
#
#

BUFSIZE = 8192
# A very generous timeout when it comes to local connections...
CONNECTION_TIMEOUT = 20.

# The hmac module implicitly defaults to using MD5.
# Support using a stronger algorithm for the challenge/response code:
HMAC_DIGEST_NAME='sha256'

_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 time.time() + timeout

def _check_timeout(t):
    return time.time() > 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':
        return tempfile.mktemp(prefix=r'\\.\pipe\pyc-%d-%d-' %
                               (os.getpid(), _mmap_counter.next()), dir="")
    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.
        '''
        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`.
        '''
        return self._listener.close()

address = property(lambda self: self._listener._address)
    last_accepted = property(lambda self: self._listener._last_accepted)

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):
        '''
        Returns pair of connection objects at either end of a pipe
        '''
        if duplex:
            s1, s2 = socket.socketpair()
            s1.setblocking(True)
            s2.setblocking(True)
            c1 = _multiprocessing.Connection(os.dup(s1.fileno()))
            c2 = _multiprocessing.Connection(os.dup(s2.fileno()))
            s1.close()
            s2.close()
        else:
            fd1, fd2 = os.pipe()
            c1 = _multiprocessing.Connection(fd1, writable=False)
            c2 = _multiprocessing.Connection(fd2, readable=False)

return c1, c2

else:
    from _multiprocessing import win32

def Pipe(duplex=True):
        '''
        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, e:
            if e.args[0] != win32.ERROR_PIPE_CONNECTED:
                raise

c1 = _multiprocessing.PipeConnection(h1, writable=duplex)
        c2 = _multiprocessing.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:
            self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            self._socket.setblocking(True)
            self._socket.bind(address)
            self._socket.listen(backlog)
            self._address = self._socket.getsockname()
        except socket.error:
            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):
        while True:
            try:
                s, self._last_accepted = self._socket.accept()
            except socket.error as e:
                if e.args[0] != errno.EINTR:
                    raise
            else:
                break
        s.setblocking(True)
        fd = duplicate(s.fileno())
        conn = _multiprocessing.Connection(fd)
        s.close()
        return conn

def close(self):
        try:
            self._socket.close()
        finally:
            unlink = self._unlink
            if unlink is not None:
                self._unlink = None
                unlink()

def SocketClient(address):
    '''
    Return a connection object connected to the socket given by `address`
    '''
    family = getattr(socket, address_type(address))
    t = _init_timeout()

while 1:
        s = socket.socket(family)
        s.setblocking(True)
        try:
            s.connect(address)
        except socket.error, e:
            s.close()
            if e.args[0] != 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 = _multiprocessing.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, e:
                # ERROR_NO_DATA can occur if a client has already connected,
                # written data and then disconnected -- see Issue 14725.
                if e.args[0] not in (win32.ERROR_PIPE_CONNECTED,
                                     win32.ERROR_NO_DATA):
                    raise
            return _multiprocessing.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, e:
                if e.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 _multiprocessing.PipeConnection(h)

#
# Authentication stuff
#

MESSAGE_LENGTH = 20

CHALLENGE = b'#CHALLENGE#'
WELCOME = b'#WELCOME#'
FAILURE = b'#FAILURE#'

def get_digestmod_for_hmac():
    import hashlib
    return getattr(hashlib, HMAC_DIGEST_NAME)

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, get_digestmod_for_hmac()).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, get_digestmod_for_hmac()).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)

def _xml_loads(s):
    (obj,), method = xmlrpclib.loads(s)
    return obj

class XmlListener(Listener):
    def accept(self):
        global xmlrpclib
        import xmlrpclib
        obj = Listener.accept(self)
        return ConnectionWrapper(obj, _xml_dumps, _xml_loads)

def XmlClient(*args, **kwds):
    global xmlrpclib
    import xmlrpclib
    return ConnectionWrapper(Client(*args, **kwds), _xml_dumps, _xml_loads)

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