cpython/Lib/socket.py at 3.15 · python/cpython · GitHub

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# Wrapper module for _socket, providing some additional facilities

# implemented in Python.

"""\

This module provides socket operations and some related functions.

On Unix, it supports IP (Internet Protocol) and Unix domain sockets.

On other systems, it only supports IP. Functions specific for a

socket are available as methods of the socket object.

Functions:

socket() -- create a new socket object

socketpair() -- create a pair of new socket objects [*]

fromfd() -- create a socket object from an open file descriptor [*]

send_fds() -- Send file descriptor to the socket.

recv_fds() -- Receive file descriptors from the socket.

fromshare() -- create a socket object from data received from socket.share() [*]

gethostname() -- return the current hostname

gethostbyname() -- map a hostname to its IP number

gethostbyaddr() -- map an IP number or hostname to DNS info

getservbyname() -- map a service name and a protocol name to a port number

getprotobyname() -- map a protocol name (e.g. 'tcp') to a number

ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order

htons(), htonl() -- convert 16, 32 bit int from host to network byte order

inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format

inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89)

socket.getdefaulttimeout() -- get the default timeout value

socket.setdefaulttimeout() -- set the default timeout value

create_connection() -- connects to an address, with an optional timeout and

optional source address.

create_server() -- create a TCP socket and bind it to a specified address.

[*] not available on all platforms!

Special objects:

SocketType -- type object for socket objects

error -- exception raised for I/O errors

has_ipv6 -- boolean value indicating if IPv6 is supported

IntEnum constants:

AF_INET, AF_UNIX -- socket domains (first argument to socket() call)

SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument)

Integer constants:

Many other constants may be defined; these may be used in calls to

the setsockopt() and getsockopt() methods.

"""

import _socket

from _socket import *

import io

import os

import sys

from enum import IntEnum, IntFlag

from functools import partial

try:

import errno

except ImportError:

errno = None

EBADF = getattr(errno, 'EBADF', 9)

EAGAIN = getattr(errno, 'EAGAIN', 11)

EWOULDBLOCK = getattr(errno, 'EWOULDBLOCK', 11)

__all__ = ["fromfd", "getfqdn", "create_connection", "create_server",

"has_dualstack_ipv6", "AddressFamily", "SocketKind"]

__all__.extend(os._get_exports_list(_socket))

# Set up the socket.AF_* socket.SOCK_* constants as members of IntEnums for

# nicer string representations.

# Note that _socket only knows about the integer values. The public interface

# in this module understands the enums and translates them back from integers

# where needed (e.g. .family property of a socket object).

IntEnum._convert_(

'AddressFamily',

__name__,

lambda C: C.isupper() and C.startswith('AF_'))

IntEnum._convert_(

'SocketKind',

__name__,

lambda C: C.isupper() and C.startswith('SOCK_'))

IntFlag._convert_(

'MsgFlag',

__name__,

lambda C: C.isupper() and C.startswith('MSG_'))

IntFlag._convert_(

'AddressInfo',

__name__,

lambda C: C.isupper() and C.startswith('AI_'))

_LOCALHOST = '127.0.0.1'

_LOCALHOST_V6 = '::1'

def _intenum_converter(value, enum_klass):

"""Convert a numeric family value to an IntEnum member.

If it's not a known member, return the numeric value itself.

"""

try:

return enum_klass(value)

except ValueError:

return value

# WSA error codes

if sys.platform.lower().startswith("win"):

errorTab = {

6: "Specified event object handle is invalid.",

8: "Insufficient memory available.",

87: "One or more parameters are invalid.",

995: "Overlapped operation aborted.",

996: "Overlapped I/O event object not in signaled state.",

997: "Overlapped operation will complete later.",

10004: "The operation was interrupted.",

10009: "A bad file handle was passed.",

10013: "Permission denied.",

10014: "An invalid pointer was passed.",

10022: "An invalid operation was attempted.",

10024: "Too many open files.",

10035: "The socket operation would block.",

10036: "A blocking operation is already in progress.",

10037: "Operation already in progress.",

10038: "Socket operation on nonsocket.",

10039: "Destination address required.",

10040: "Message too long.",

10041: "Protocol wrong type for socket.",

10042: "Bad protocol option.",

10043: "Protocol not supported.",

10044: "Socket type not supported.",

10045: "Operation not supported.",

10046: "Protocol family not supported.",

10047: "Address family not supported by protocol family.",

10048: "The network address is in use.",

10049: "Cannot assign requested address.",

10050: "Network is down.",

10051: "Network is unreachable.",

10052: "Network dropped connection on reset.",

10053: "Software caused connection abort.",

10054: "The connection has been reset.",

10055: "No buffer space available.",

10056: "Socket is already connected.",

10057: "Socket is not connected.",

10058: "The network has been shut down.",

10059: "Too many references.",

10060: "The operation timed out.",

10061: "Connection refused.",

10062: "Cannot translate name.",

10063: "The name is too long.",

10064: "The host is down.",

10065: "The host is unreachable.",

10066: "Directory not empty.",

10067: "Too many processes.",

10068: "User quota exceeded.",

10069: "Disk quota exceeded.",

10070: "Stale file handle reference.",

10071: "Item is remote.",

10091: "Network subsystem is unavailable.",

10092: "Winsock.dll version out of range.",

10093: "Successful WSAStartup not yet performed.",

10101: "Graceful shutdown in progress.",

10102: "No more results from WSALookupServiceNext.",

10103: "Call has been canceled.",

10104: "Procedure call table is invalid.",

10105: "Service provider is invalid.",

10106: "Service provider failed to initialize.",

10107: "System call failure.",

10108: "Service not found.",

10109: "Class type not found.",

10110: "No more results from WSALookupServiceNext.",

10111: "Call was canceled.",

10112: "Database query was refused.",

11001: "Host not found.",

11002: "Nonauthoritative host not found.",

11003: "This is a nonrecoverable error.",

11004: "Valid name, no data record of requested type.",

11005: "QoS receivers.",

11006: "QoS senders.",

11007: "No QoS senders.",

11008: "QoS no receivers.",

11009: "QoS request confirmed.",

11010: "QoS admission error.",

11011: "QoS policy failure.",

11012: "QoS bad style.",

11013: "QoS bad object.",

11014: "QoS traffic control error.",

11015: "QoS generic error.",

11016: "QoS service type error.",

11017: "QoS flowspec error.",

11018: "Invalid QoS provider buffer.",

11019: "Invalid QoS filter style.",

11020: "Invalid QoS filter type.",

11021: "Incorrect QoS filter count.",

11022: "Invalid QoS object length.",

11023: "Incorrect QoS flow count.",

11024: "Unrecognized QoS object.",

11025: "Invalid QoS policy object.",

11026: "Invalid QoS flow descriptor.",

11027: "Invalid QoS provider-specific flowspec.",

11028: "Invalid QoS provider-specific filterspec.",

11029: "Invalid QoS shape discard mode object.",

11030: "Invalid QoS shaping rate object.",

11031: "Reserved policy QoS element type."

}

__all__.append("errorTab")

class _GiveupOnSendfile(Exception): pass

class socket(_socket.socket):

"""A subclass of _socket.socket adding the makefile() method."""

__slots__ = ["__weakref__", "_io_refs", "_closed"]

def __init__(self, family=-1, type=-1, proto=-1, fileno=None):

# For user code address family and type values are IntEnum members, but

# for the underlying _socket.socket they're just integers. The

# constructor of _socket.socket converts the given argument to an

# integer automatically.

if fileno is None:

if family == -1:

family = AF_INET

if type == -1:

type = SOCK_STREAM

if proto == -1:

proto = 0

_socket.socket.__init__(self, family, type, proto, fileno)

self._io_refs = 0

self._closed = False

def __enter__(self):

return self

def __exit__(self, *args):

if not self._closed:

self.close()

def __repr__(self):

"""Wrap __repr__() to reveal the real class name and socket

address(es).

"""

closed = getattr(self, '_closed', False)

s = "<%s.%s%s fd=%i, family=%s, type=%s, proto=%i" \

% (self.__class__.__module__,

self.__class__.__qualname__,

" [closed]" if closed else "",

self.fileno(),

self.family,

self.type,

self.proto)

if not closed:

# getsockname and getpeername may not be available on WASI.

try:

laddr = self.getsockname()

if laddr:

s += ", laddr=%s" % str(laddr)

except (error, AttributeError):

pass

try:

raddr = self.getpeername()

if raddr:

s += ", raddr=%s" % str(raddr)

except (error, AttributeError):

pass

s += '>'

return s

def __getstate__(self):

raise TypeError(f"cannot pickle {self.__class__.__name__!r} object")

def dup(self):

"""dup() -> socket object

Duplicate the socket. Return a new socket object connected to the same

system resource. The new socket is non-inheritable.

"""

fd = dup(self.fileno())

sock = self.__class__(self.family, self.type, self.proto, fileno=fd)

sock.settimeout(self.gettimeout())

return sock

def accept(self):

"""accept() -> (socket object, address info)

Wait for an incoming connection. Return a new socket

representing the connection, and the address of the client.

For IP sockets, the address info is a pair (hostaddr, port).

"""

fd, addr = self._accept()

sock = socket(self.family, self.type, self.proto, fileno=fd)

# Issue #7995: if no default timeout is set and the listening

# socket had a (non-zero) timeout, force the new socket in blocking

# mode to override platform-specific socket flags inheritance.

if getdefaulttimeout() is None and self.gettimeout():

sock.setblocking(True)

return sock, addr

def makefile(self, mode="r", buffering=None, *,

encoding=None, errors=None, newline=None):

"""makefile(...) -> an I/O stream connected to the socket

The arguments are as for io.open() after the filename, except the only

supported mode values are 'r' (default), 'w', 'b', or a combination of

those.

"""

# XXX refactor to share code?

if not set(mode) <= {"r", "w", "b"}:

raise ValueError("invalid mode %r (only r, w, b allowed)" % (mode,))

writing = "w" in mode

reading = "r" in mode or not writing

assert reading or writing

binary = "b" in mode

rawmode = ""

if reading:

rawmode += "r"

if writing:

rawmode += "w"

raw = SocketIO(self, rawmode)

self._io_refs += 1

if buffering is None:

buffering = -1

if buffering < 0:

buffering = io.DEFAULT_BUFFER_SIZE

if buffering == 0:

if not binary:

raise ValueError("unbuffered streams must be binary")

return raw

if reading and writing:

buffer = io.BufferedRWPair(raw, raw, buffering)

elif reading:

buffer = io.BufferedReader(raw, buffering)

else:

assert writing

buffer = io.BufferedWriter(raw, buffering)

if binary:

return buffer

encoding = io.text_encoding(encoding)

text = io.TextIOWrapper(buffer, encoding, errors, newline)

text.mode = mode

return text

def _sendfile_zerocopy(self, zerocopy_func, giveup_exc_type, file,

offset=0, count=None):

"""

Send a file using a zero-copy function.

"""

import selectors

self._check_sendfile_params(file, offset, count)

sockno = self.fileno()

try:

fileno = file.fileno()

except (AttributeError, io.UnsupportedOperation) as err:

raise giveup_exc_type(err) # not a regular file

try:

fsize = os.fstat(fileno).st_size

except OSError as err:

raise giveup_exc_type(err) # not a regular file

if not fsize:

return 0 # empty file

# Truncate to 1GiB to avoid OverflowError, see bpo-38319.

blocksize = min(count or fsize, 2 ** 30)

timeout = self.gettimeout()

if timeout == 0:

raise ValueError("non-blocking sockets are not supported")

# poll/select have the advantage of not requiring any

# extra file descriptor, contrarily to epoll/kqueue

# (also, they require a single syscall).

if hasattr(selectors, 'PollSelector'):

selector = selectors.PollSelector()

else:

selector = selectors.SelectSelector()

selector.register(sockno, selectors.EVENT_WRITE)

total_sent = 0

# localize variable access to minimize overhead

selector_select = selector.select

try:

while True:

if timeout and not selector_select(timeout):

raise TimeoutError('timed out')

if count:

blocksize = min(count - total_sent, blocksize)

if blocksize <= 0:

break

try:

sent = zerocopy_func(fileno, offset, blocksize)

except BlockingIOError:

if not timeout:

# Block until the socket is ready to send some

# data; avoids hogging CPU resources.

selector_select()

continue

except OSError as err:

if total_sent == 0:

# We can get here for different reasons, the main

# one being 'file' is not a regular mmap(2)-like

# file, in which case we'll fall back on using

# plain send().

raise giveup_exc_type(err)

raise err from None

else:

if sent == 0:

break # EOF

offset += sent

total_sent += sent

return total_sent

finally:

if total_sent > 0 and hasattr(file, 'seek'):

file.seek(offset)

if hasattr(os, 'sendfile'):

def _sendfile_use_sendfile(self, file, offset=0, count=None):

return self._sendfile_zerocopy(

partial(os.sendfile, self.fileno()),

_GiveupOnSendfile,

file, offset, count,

)

else:

def _sendfile_use_sendfile(self, file, offset=0, count=None):

raise _GiveupOnSendfile(

"os.sendfile() not available on this platform")

def _sendfile_use_send(self, file, offset=0, count=None):

self._check_sendfile_params(file, offset, count)

if self.gettimeout() == 0:

raise ValueError("non-blocking sockets are not supported")

if offset:

file.seek(offset)

blocksize = min(count, 8192) if count else 8192

total_sent = 0

# localize variable access to minimize overhead

file_read = file.read

sock_send = self.send

try:

while True:

if count:

blocksize = min(count - total_sent, blocksize)

if blocksize <= 0:

break

data = memoryview(file_read(blocksize))

if not data:

break # EOF

while True:

try:

sent = sock_send(data)

except BlockingIOError:

continue

else:

total_sent += sent

if sent < len(data):

data = data[sent:]

else:

break

return total_sent

finally:

if total_sent > 0 and hasattr(file, 'seek'):

file.seek(offset + total_sent)

def _check_sendfile_params(self, file, offset, count):

if 'b' not in getattr(file, 'mode', 'b'):

raise ValueError("file should be opened in binary mode")

if not self.type & SOCK_STREAM:

raise ValueError("only SOCK_STREAM type sockets are supported")

if count is not None:

if not isinstance(count, int):

raise TypeError(

"count must be a positive integer (got {!r})".format(count))

if count <= 0:

raise ValueError(

"count must be a positive integer (got {!r})".format(count))

def sendfile(self, file, offset=0, count=None):

"""sendfile(file[, offset[, count]]) -> sent

Send a file until EOF is reached by using high-performance

os.sendfile() and return the total number of bytes which

were sent.

*file* must be a regular file object opened in binary mode.

If os.sendfile() is not available (e.g. Windows) or file is

not a regular file socket.send() will be used instead.

*offset* tells from where to start reading the file.

If specified, *count* is the total number of bytes to transmit

as opposed to sending the file until EOF is reached.

File position is updated on return or also in case of error in

which case file.tell() can be used to figure out the number of

bytes which were sent.

The socket must be of SOCK_STREAM type.

Non-blocking sockets are not supported.

"""

try:

return self._sendfile_use_sendfile(file, offset, count)

except _GiveupOnSendfile:

return self._sendfile_use_send(file, offset, count)

def _decref_socketios(self):

if self._io_refs > 0:

self._io_refs -= 1

if self._closed:

self.close()

def _real_close(self, _ss=_socket.socket):

# This function should not reference any globals. See issue #808164.

_ss.close(self)

def close(self):

# This function should not reference any globals. See issue #808164.

self._closed = True

if self._io_refs <= 0:

self._real_close()

def detach(self):

"""detach() -> file descriptor

Close the socket object without closing the underlying file descriptor.

The object cannot be used after this call, but the file descriptor

can be reused for other purposes. The file descriptor is returned.

"""

self._closed = True

return super().detach()

@property

def family(self):

"""Read-only access to the address family for this socket.

"""

return _intenum_converter(super().family, AddressFamily)

@property

def type(self):

"""Read-only access to the socket type.

"""

return _intenum_converter(super().type, SocketKind)

if os.name == 'nt':

def get_inheritable(self):

return os.get_handle_inheritable(self.fileno())

def set_inheritable(self, inheritable):

os.set_handle_inheritable(self.fileno(), inheritable)

else:

def get_inheritable(self):

return os.get_inheritable(self.fileno())

def set_inheritable(self, inheritable):

os.set_inheritable(self.fileno(), inheritable)

get_inheritable.__doc__ = "Get the inheritable flag of the socket"

set_inheritable.__doc__ = "Set the inheritable flag of the socket"

def fromfd(fd, family, type, proto=0):

""" fromfd(fd, family, type[, proto]) -> socket object

Create a socket object from a duplicate of the given file

descriptor. The remaining arguments are the same as for socket().

"""

nfd = dup(fd)

return socket(family, type, proto, nfd)

if hasattr(_socket.socket, "sendmsg"):

def send_fds(sock, buffers, fds, flags=0, address=None):

""" send_fds(sock, buffers, fds[, flags[, address]]) -> integer

Send the list of file descriptors fds over an AF_UNIX socket.

"""

import array

return sock.sendmsg(buffers, [(_socket.SOL_SOCKET,

_socket.SCM_RIGHTS, array.array("i", fds))])

__all__.append("send_fds")

if hasattr(_socket.socket, "recvmsg"):

def recv_fds(sock, bufsize, maxfds, flags=0):

""" recv_fds(sock, bufsize, maxfds[, flags]) -> (data, list of file

descriptors, msg_flags, address)

Receive up to maxfds file descriptors returning the message

data and a list containing the descriptors.

"""

import array

# Array of ints

fds = array.array("i")

msg, ancdata, flags, addr = sock.recvmsg(bufsize,

_socket.CMSG_LEN(maxfds * fds.itemsize))

for cmsg_level, cmsg_type, cmsg_data in ancdata:

if (cmsg_level == _socket.SOL_SOCKET and cmsg_type == _socket.SCM_RIGHTS):

fds.frombytes(cmsg_data[:

len(cmsg_data) - (len(cmsg_data) % fds.itemsize)])

return msg, list(fds), flags, addr

__all__.append("recv_fds")

if hasattr(_socket.socket, "share"):

def fromshare(info):

""" fromshare(info) -> socket object

Create a socket object from the bytes object returned by

socket.share(pid).

"""

return socket(0, 0, 0, info)

__all__.append("fromshare")

# Origin: https://gist.github.com/4325783, by Geert Jansen. Public domain.

# This is used if _socket doesn't natively provide socketpair. It's

# always defined so that it can be patched in for testing purposes.

def _fallback_socketpair(family=AF_INET, type=SOCK_STREAM, proto=0):

if family == AF_INET:

host = _LOCALHOST

elif family == AF_INET6:

host = _LOCALHOST_V6

else:

raise ValueError("Only AF_INET and AF_INET6 socket address families "

"are supported")

if type != SOCK_STREAM:

raise ValueError("Only SOCK_STREAM socket type is supported")

if proto != 0:

raise ValueError("Only protocol zero is supported")

# We create a connected TCP socket. Note the trick with

# setblocking(False) that prevents us from having to create a thread.

lsock = socket(family, type, proto)

try:

lsock.bind((host, 0))

lsock.listen()

# On IPv6, ignore flow_info and scope_id

addr, port = lsock.getsockname()[:2]

csock = socket(family, type, proto)

try:

csock.setblocking(False)

try:

csock.connect((addr, port))

except (BlockingIOError, InterruptedError):

pass

csock.setblocking(True)

ssock, _ = lsock.accept()

except:

csock.close()

raise

finally:

lsock.close()

# Authenticating avoids using a connection from something else

# able to connect to {host}:{port} instead of us.

# We expect only AF_INET and AF_INET6 families.

# Note that we skip this on WASI because on that platorm the client socket

# may not have finished connecting by the time we've reached this point (gh-146139).

if sys.platform != "wasi":

try:

if (

ssock.getsockname() != csock.getpeername()

or csock.getsockname() != ssock.getpeername()

raise ConnectionError("Unexpected peer connection")

except:

# getsockname() and getpeername() can fail

# if either socket isn't connected.

ssock.close()

csock.close()

raise

return (ssock, csock)

if hasattr(_socket, "socketpair"):

def socketpair(family=None, type=SOCK_STREAM, proto=0):

if family is None:

try:

family = AF_UNIX

except NameError:

family = AF_INET

a, b = _socket.socketpair(family, type, proto)

a = socket(family, type, proto, a.detach())

b = socket(family, type, proto, b.detach())

return a, b

else:

socketpair = _fallback_socketpair

__all__.append("socketpair")

socketpair.__doc__ = """socketpair([family[, type[, proto]]]) -> (socket object, socket object)

Create a pair of socket objects from the sockets returned by the platform

socketpair() function.

The arguments are the same as for socket() except the default family is AF_UNIX

if defined on the platform; otherwise, the default is AF_INET.

"""

_blocking_errnos = { EAGAIN, EWOULDBLOCK }

class SocketIO(io.RawIOBase):

"""Raw I/O implementation for stream sockets.

This class supports the makefile() method on sockets. It provides

the raw I/O interface on top of a socket object.

"""

# One might wonder why not let FileIO do the job instead. There are two

# main reasons why FileIO is not adapted:

# - it wouldn't work under Windows (where you can't used read() and

# write() on a socket handle)

# - it wouldn't work with socket timeouts (FileIO would ignore the

# timeout and consider the socket non-blocking)

# XXX More docs

def __init__(self, sock, mode):

if mode not in ("r", "w", "rw", "rb", "wb", "rwb"):

raise ValueError("invalid mode: %r" % mode)

io.RawIOBase.__init__(self)

self._sock = sock

if "b" not in mode:

mode += "b"

self._mode = mode

self._reading = "r" in mode

self._writing = "w" in mode

self._timeout_occurred = False

def readinto(self, b):

"""Read up to len(b) bytes into the writable buffer *b* and return

the number of bytes read. If the socket is non-blocking and no bytes

are available, None is returned.

If *b* is non-empty, a 0 return value indicates that the connection

was shutdown at the other end.

"""

self._checkClosed()

self._checkReadable()

if self._timeout_occurred:

raise OSError("cannot read from timed out object")

try:

return self._sock.recv_into(b)

except timeout:

self._timeout_occurred = True

raise

except error as e:

if e.errno in _blocking_errnos:

return None

raise

def write(self, b):

"""Write the given bytes or bytearray object *b* to the socket

and return the number of bytes written. This can be less than

len(b) if not all data could be written. If the socket is

non-blocking and no bytes could be written None is returned.

"""

self._checkClosed()

self._checkWritable()

try:

return self._sock.send(b)

except error as e:

# XXX what about EINTR?

if e.errno in _blocking_errnos:

return None

raise

def readable(self):

"""True if the SocketIO is open for reading.

"""

if self.closed:

raise ValueError("I/O operation on closed socket.")

return self._reading

def writable(self):

"""True if the SocketIO is open for writing.

"""

if self.closed:

raise ValueError("I/O operation on closed socket.")

return self._writing

def seekable(self):

"""True if the SocketIO is open for seeking.

"""

if self.closed:

raise ValueError("I/O operation on closed socket.")

return super().seekable()

def fileno(self):

"""Return the file descriptor of the underlying socket.

"""

self._checkClosed()

return self._sock.fileno()

@property

def name(self):

if not self.closed:

return self.fileno()

else:

return -1

@property

def mode(self):

return self._mode

def close(self):

"""Close the SocketIO object. This doesn't close the underlying

socket, except if all references to it have disappeared.

"""

if self.closed:

return

io.RawIOBase.close(self)

self._sock._decref_socketios()

self._sock = None

def getfqdn(name=''):

"""Get fully qualified domain name from name.

An empty argument is interpreted as meaning the local host.

First the hostname returned by gethostbyaddr() is checked, then

possibly existing aliases. In case no FQDN is available and `name`

was given, it is returned unchanged. If `name` was empty, '0.0.0.0' or '::',

hostname from gethostname() is returned.

"""

name = name.strip()

if not name or name in ('0.0.0.0', '::'):

name = gethostname()

try:

hostname, aliases, ipaddrs = gethostbyaddr(name)

except error:

pass

else:

aliases.insert(0, hostname)

for name in aliases:

if '.' in name:

break

else:

name = hostname

return name

_GLOBAL_DEFAULT_TIMEOUT = object()

def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,

source_address=None, *, all_errors=False):

"""Connect to *address* and return the socket object.

Convenience function. Connect to *address* (a 2-tuple ``(host,

port)``) and return the socket object. Passing the optional

*timeout* parameter will set the timeout on the socket instance

before attempting to connect. If no *timeout* is supplied, the

global default timeout setting returned by :func:`getdefaulttimeout`

is used. If *source_address* is set it must be a tuple of (host, port)

for the socket to bind as a source address before making the connection.

A host of '' or port 0 tells the OS to use the default. When a connection

cannot be created, raises the last error if *all_errors* is False,

and an ExceptionGroup of all errors if *all_errors* is True.

"""

host, port = address

exceptions = []

for res in getaddrinfo(host, port, 0, SOCK_STREAM):

af, socktype, proto, canonname, sa = res

sock = None

try:

sock = socket(af, socktype, proto)

if timeout is not _GLOBAL_DEFAULT_TIMEOUT:

sock.settimeout(timeout)

if source_address:

sock.bind(source_address)

sock.connect(sa)

# Break explicitly a reference cycle

exceptions.clear()

return sock

except error as exc:

if not all_errors:

exceptions.clear() # raise only the last error

exceptions.append(exc)

if sock is not None:

sock.close()

if len(exceptions):

try:

if not all_errors:

raise exceptions[0]

raise ExceptionGroup("create_connection failed", exceptions)

finally:

# Break explicitly a reference cycle

exceptions.clear()

else:

raise error("getaddrinfo returns an empty list")

def has_dualstack_ipv6():

"""Return True if the platform supports creating a SOCK_STREAM socket

which can handle both AF_INET and AF_INET6 (IPv4 / IPv6) connections.

"""

if not has_ipv6 \

or not hasattr(_socket, 'IPPROTO_IPV6') \

or not hasattr(_socket, 'IPV6_V6ONLY'):

return False

try:

with socket(AF_INET6, SOCK_STREAM) as sock:

sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 0)

# On some platforms (e.g. DragonFly BSD) setting IPV6_V6ONLY to 0

# silently has no effect, so check that it was actually cleared.

return sock.getsockopt(IPPROTO_IPV6, IPV6_V6ONLY) == 0

except error:

return False

def create_server(address, *, family=AF_INET, backlog=None, reuse_port=False,

dualstack_ipv6=False):

"""Convenience function which creates a SOCK_STREAM type socket

bound to *address* (a 2-tuple (host, port)) and return the socket

object.

*family* should be either AF_INET or AF_INET6.

*backlog* is the queue size passed to socket.listen().

*reuse_port* dictates whether to use the SO_REUSEPORT socket option.

*dualstack_ipv6*: if true and the platform supports it, it will

create an AF_INET6 socket able to accept both IPv4 or IPv6

connections. When false it will explicitly disable this option on

platforms that enable it by default (e.g. Linux).

>>> with create_server(('', 8000)) as server:

... while True:

... conn, addr = server.accept()

... # handle new connection

"""

if reuse_port and not hasattr(_socket, "SO_REUSEPORT"):

raise ValueError("SO_REUSEPORT not supported on this platform")

if dualstack_ipv6:

if not has_dualstack_ipv6():

raise ValueError("dualstack_ipv6 not supported on this platform")

if family != AF_INET6:

raise ValueError("dualstack_ipv6 requires AF_INET6 family")

sock = socket(family, SOCK_STREAM)

try:

# Note about Windows. We don't set SO_REUSEADDR because:

# 1) It's unnecessary: bind() will succeed even in case of a

# previous closed socket on the same address and still in

# TIME_WAIT state.

# 2) If set, another socket is free to bind() on the same

# address, effectively preventing this one from accepting

# connections. Also, it may set the process in a state where

# it'll no longer respond to any signals or graceful kills.

# See: https://learn.microsoft.com/windows/win32/winsock/using-so-reuseaddr-and-so-exclusiveaddruse

if os.name not in ('nt', 'cygwin') and \

hasattr(_socket, 'SO_REUSEADDR'):

try:

sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)

except error:

# Fail later on bind(), for platforms which may not

# support this option.

pass

# Since Linux 6.12.9, SO_REUSEPORT is not allowed

# on other address families than AF_INET/AF_INET6.

if reuse_port and family in (AF_INET, AF_INET6):

sock.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)

if has_ipv6 and family == AF_INET6:

if dualstack_ipv6:

sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 0)

elif hasattr(_socket, "IPV6_V6ONLY") and \

hasattr(_socket, "IPPROTO_IPV6"):

sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 1)

try:

sock.bind(address)

except error as err:

msg = '%s (while attempting to bind on address %r)' % \

(err.strerror, address)

raise error(err.errno, msg) from None

if backlog is None:

sock.listen()

else:

sock.listen(backlog)

return sock

except error:

sock.close()

raise

def getaddrinfo(host, port, family=0, type=0, proto=0, flags=0):

"""Resolve host and port into list of address info entries.

Translate the host/port argument into a sequence of 5-tuples that contain

all the necessary arguments for creating a socket connected to that service.

host is a domain name, a string representation of an IPv4/v6 address or

None. port is a string service name such as 'http', a numeric port number or

None. By passing None as the value of host and port, you can pass NULL to

the underlying C API.

The family, type and proto arguments can be optionally specified in order to

narrow the list of addresses returned. Passing zero as a value for each of

these arguments selects the full range of results.

"""

# We override this function since we want to translate the numeric family

# and socket type values to enum constants.

addrlist = []

for res in _socket.getaddrinfo(host, port, family, type, proto, flags):

af, socktype, proto, canonname, sa = res

addrlist.append((_intenum_converter(af, AddressFamily),

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