<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: connection.py.tar</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>opt/alt/python312/lib64/python3.12/multiprocessing/connection.py                                    0000644                 00000120666 15051712514 0020416 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       #
# 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.
#

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

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

import _multiprocessing

from . import util

from . import AuthenticationError, BufferTooShort
from .context import reduction
_ForkingPickler = reduction.ForkingPickler

try:
    import _winapi
    from _winapi import WAIT_OBJECT_0, WAIT_ABANDONED_0, WAIT_TIMEOUT, INFINITE
except ImportError:
    if sys.platform == 'win32':
        raise
    _winapi = 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 time.monotonic() + timeout

def _check_timeout(t):
    return time.monotonic() &gt; 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=util.get_temp_dir())
    elif family == 'AF_PIPE':
        return tempfile.mktemp(prefix=r'\\.\pipe\pyc-%d-%d-' %
                               (os.getpid(), next(_mmap_counter)), dir=&quot;&quot;)
    else:
        raise ValueError('unrecognized family')

def _validate_family(family):
    '''
    Checks if the family is valid for the current environment.
    '''
    if sys.platform != 'win32' and family == 'AF_PIPE':
        raise ValueError('Family %s is not recognized.' % family)

    if sys.platform == 'win32' and family == 'AF_UNIX':
        # double check
        if not hasattr(socket, family):
            raise ValueError('Family %s is not recognized.' % 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 or util.is_abstract_socket_namespace(address):
        return 'AF_UNIX'
    else:
        raise ValueError('address type of %r unrecognized' % address)

#
# Connection classes
#

class _ConnectionBase:
    _handle = None

    def __init__(self, handle, readable=True, writable=True):
        handle = handle.__index__()
        if handle &lt; 0:
            raise ValueError(&quot;invalid handle&quot;)
        if not readable and not writable:
            raise ValueError(
                &quot;at least one of `readable` and `writable` must be True&quot;)
        self._handle = handle
        self._readable = readable
        self._writable = writable

    # XXX should we use util.Finalize instead of a __del__?

    def __del__(self):
        if self._handle is not None:
            self._close()

    def _check_closed(self):
        if self._handle is None:
            raise OSError(&quot;handle is closed&quot;)

    def _check_readable(self):
        if not self._readable:
            raise OSError(&quot;connection is write-only&quot;)

    def _check_writable(self):
        if not self._writable:
            raise OSError(&quot;connection is read-only&quot;)

    def _bad_message_length(self):
        if self._writable:
            self._readable = False
        else:
            self.close()
        raise OSError(&quot;bad message length&quot;)

    @property
    def closed(self):
        &quot;&quot;&quot;True if the connection is closed&quot;&quot;&quot;
        return self._handle is None

    @property
    def readable(self):
        &quot;&quot;&quot;True if the connection is readable&quot;&quot;&quot;
        return self._readable

    @property
    def writable(self):
        &quot;&quot;&quot;True if the connection is writable&quot;&quot;&quot;
        return self._writable

    def fileno(self):
        &quot;&quot;&quot;File descriptor or handle of the connection&quot;&quot;&quot;
        self._check_closed()
        return self._handle

    def close(self):
        &quot;&quot;&quot;Close the connection&quot;&quot;&quot;
        if self._handle is not None:
            try:
                self._close()
            finally:
                self._handle = None

    def send_bytes(self, buf, offset=0, size=None):
        &quot;&quot;&quot;Send the bytes data from a bytes-like object&quot;&quot;&quot;
        self._check_closed()
        self._check_writable()
        m = memoryview(buf)
        if m.itemsize &gt; 1:
            m = m.cast('B')
        n = m.nbytes
        if offset &lt; 0:
            raise ValueError(&quot;offset is negative&quot;)
        if n &lt; offset:
            raise ValueError(&quot;buffer length &lt; offset&quot;)
        if size is None:
            size = n - offset
        elif size &lt; 0:
            raise ValueError(&quot;size is negative&quot;)
        elif offset + size &gt; n:
            raise ValueError(&quot;buffer length &lt; offset + size&quot;)
        self._send_bytes(m[offset:offset + size])

    def send(self, obj):
        &quot;&quot;&quot;Send a (picklable) object&quot;&quot;&quot;
        self._check_closed()
        self._check_writable()
        self._send_bytes(_ForkingPickler.dumps(obj))

    def recv_bytes(self, maxlength=None):
        &quot;&quot;&quot;
        Receive bytes data as a bytes object.
        &quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        if maxlength is not None and maxlength &lt; 0:
            raise ValueError(&quot;negative maxlength&quot;)
        buf = self._recv_bytes(maxlength)
        if buf is None:
            self._bad_message_length()
        return buf.getvalue()

    def recv_bytes_into(self, buf, offset=0):
        &quot;&quot;&quot;
        Receive bytes data into a writeable bytes-like object.
        Return the number of bytes read.
        &quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        with memoryview(buf) as m:
            # Get bytesize of arbitrary buffer
            itemsize = m.itemsize
            bytesize = itemsize * len(m)
            if offset &lt; 0:
                raise ValueError(&quot;negative offset&quot;)
            elif offset &gt; bytesize:
                raise ValueError(&quot;offset too large&quot;)
            result = self._recv_bytes()
            size = result.tell()
            if bytesize &lt; offset + size:
                raise BufferTooShort(result.getvalue())
            # Message can fit in dest
            result.seek(0)
            result.readinto(m[offset // itemsize :
                              (offset + size) // itemsize])
            return size

    def recv(self):
        &quot;&quot;&quot;Receive a (picklable) object&quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        buf = self._recv_bytes()
        return _ForkingPickler.loads(buf.getbuffer())

    def poll(self, timeout=0.0):
        &quot;&quot;&quot;Whether there is any input available to be read&quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        return self._poll(timeout)

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, exc_tb):
        self.close()


if _winapi:

    class PipeConnection(_ConnectionBase):
        &quot;&quot;&quot;
        Connection class based on a Windows named pipe.
        Overlapped I/O is used, so the handles must have been created
        with FILE_FLAG_OVERLAPPED.
        &quot;&quot;&quot;
        _got_empty_message = False
        _send_ov = None

        def _close(self, _CloseHandle=_winapi.CloseHandle):
            ov = self._send_ov
            if ov is not None:
                # Interrupt WaitForMultipleObjects() in _send_bytes()
                ov.cancel()
            _CloseHandle(self._handle)

        def _send_bytes(self, buf):
            if self._send_ov is not None:
                # A connection should only be used by a single thread
                raise ValueError(&quot;concurrent send_bytes() calls &quot;
                                 &quot;are not supported&quot;)
            ov, err = _winapi.WriteFile(self._handle, buf, overlapped=True)
            self._send_ov = ov
            try:
                if err == _winapi.ERROR_IO_PENDING:
                    waitres = _winapi.WaitForMultipleObjects(
                        [ov.event], False, INFINITE)
                    assert waitres == WAIT_OBJECT_0
            except:
                ov.cancel()
                raise
            finally:
                self._send_ov = None
                nwritten, err = ov.GetOverlappedResult(True)
            if err == _winapi.ERROR_OPERATION_ABORTED:
                # close() was called by another thread while
                # WaitForMultipleObjects() was waiting for the overlapped
                # operation.
                raise OSError(errno.EPIPE, &quot;handle is closed&quot;)
            assert err == 0
            assert nwritten == len(buf)

        def _recv_bytes(self, maxsize=None):
            if self._got_empty_message:
                self._got_empty_message = False
                return io.BytesIO()
            else:
                bsize = 128 if maxsize is None else min(maxsize, 128)
                try:
                    ov, err = _winapi.ReadFile(self._handle, bsize,
                                                overlapped=True)
                    try:
                        if err == _winapi.ERROR_IO_PENDING:
                            waitres = _winapi.WaitForMultipleObjects(
                                [ov.event], False, INFINITE)
                            assert waitres == WAIT_OBJECT_0
                    except:
                        ov.cancel()
                        raise
                    finally:
                        nread, err = ov.GetOverlappedResult(True)
                        if err == 0:
                            f = io.BytesIO()
                            f.write(ov.getbuffer())
                            return f
                        elif err == _winapi.ERROR_MORE_DATA:
                            return self._get_more_data(ov, maxsize)
                except OSError as e:
                    if e.winerror == _winapi.ERROR_BROKEN_PIPE:
                        raise EOFError
                    else:
                        raise
            raise RuntimeError(&quot;shouldn't get here; expected KeyboardInterrupt&quot;)

        def _poll(self, timeout):
            if (self._got_empty_message or
                        _winapi.PeekNamedPipe(self._handle)[0] != 0):
                return True
            return bool(wait([self], timeout))

        def _get_more_data(self, ov, maxsize):
            buf = ov.getbuffer()
            f = io.BytesIO()
            f.write(buf)
            left = _winapi.PeekNamedPipe(self._handle)[1]
            assert left &gt; 0
            if maxsize is not None and len(buf) + left &gt; maxsize:
                self._bad_message_length()
            ov, err = _winapi.ReadFile(self._handle, left, overlapped=True)
            rbytes, err = ov.GetOverlappedResult(True)
            assert err == 0
            assert rbytes == left
            f.write(ov.getbuffer())
            return f


class Connection(_ConnectionBase):
    &quot;&quot;&quot;
    Connection class based on an arbitrary file descriptor (Unix only), or
    a socket handle (Windows).
    &quot;&quot;&quot;

    if _winapi:
        def _close(self, _close=_multiprocessing.closesocket):
            _close(self._handle)
        _write = _multiprocessing.send
        _read = _multiprocessing.recv
    else:
        def _close(self, _close=os.close):
            _close(self._handle)
        _write = os.write
        _read = os.read

    def _send(self, buf, write=_write):
        remaining = len(buf)
        while True:
            n = write(self._handle, buf)
            remaining -= n
            if remaining == 0:
                break
            buf = buf[n:]

    def _recv(self, size, read=_read):
        buf = io.BytesIO()
        handle = self._handle
        remaining = size
        while remaining &gt; 0:
            chunk = read(handle, remaining)
            n = len(chunk)
            if n == 0:
                if remaining == size:
                    raise EOFError
                else:
                    raise OSError(&quot;got end of file during message&quot;)
            buf.write(chunk)
            remaining -= n
        return buf

    def _send_bytes(self, buf):
        n = len(buf)
        if n &gt; 0x7fffffff:
            pre_header = struct.pack(&quot;!i&quot;, -1)
            header = struct.pack(&quot;!Q&quot;, n)
            self._send(pre_header)
            self._send(header)
            self._send(buf)
        else:
            # For wire compatibility with 3.7 and lower
            header = struct.pack(&quot;!i&quot;, n)
            if n &gt; 16384:
                # The payload is large so Nagle's algorithm won't be triggered
                # and we'd better avoid the cost of concatenation.
                self._send(header)
                self._send(buf)
            else:
                # Issue #20540: concatenate before sending, to avoid delays due
                # to Nagle's algorithm on a TCP socket.
                # Also note we want to avoid sending a 0-length buffer separately,
                # to avoid &quot;broken pipe&quot; errors if the other end closed the pipe.
                self._send(header + buf)

    def _recv_bytes(self, maxsize=None):
        buf = self._recv(4)
        size, = struct.unpack(&quot;!i&quot;, buf.getvalue())
        if size == -1:
            buf = self._recv(8)
            size, = struct.unpack(&quot;!Q&quot;, buf.getvalue())
        if maxsize is not None and size &gt; maxsize:
            return None
        return self._recv(size)

    def _poll(self, timeout):
        r = wait([self], timeout)
        return bool(r)


#
# 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)

        _validate_family(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 OSError('listener is closed')

        c = self._listener.accept()
        if self._authkey is not None:
            deliver_challenge(c, self._authkey)
            answer_challenge(c, self._authkey)
        return c

    def close(self):
        '''
        Close the bound socket or named pipe of `self`.
        '''
        listener = self._listener
        if listener is not None:
            self._listener = None
            listener.close()

    @property
    def address(self):
        return self._listener._address

    @property
    def last_accepted(self):
        return self._listener._last_accepted

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, exc_tb):
        self.close()


def Client(address, family=None, authkey=None):
    '''
    Returns a connection to the address of a `Listener`
    '''
    family = family or address_type(address)
    _validate_family(family)
    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 = Connection(s1.detach())
            c2 = Connection(s2.detach())
        else:
            fd1, fd2 = os.pipe()
            c1 = Connection(fd1, writable=False)
            c2 = Connection(fd2, readable=False)

        return c1, c2

else:

    def Pipe(duplex=True):
        '''
        Returns pair of connection objects at either end of a pipe
        '''
        address = arbitrary_address('AF_PIPE')
        if duplex:
            openmode = _winapi.PIPE_ACCESS_DUPLEX
            access = _winapi.GENERIC_READ | _winapi.GENERIC_WRITE
            obsize, ibsize = BUFSIZE, BUFSIZE
        else:
            openmode = _winapi.PIPE_ACCESS_INBOUND
            access = _winapi.GENERIC_WRITE
            obsize, ibsize = 0, BUFSIZE

        h1 = _winapi.CreateNamedPipe(
            address, openmode | _winapi.FILE_FLAG_OVERLAPPED |
            _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE,
            _winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
            _winapi.PIPE_WAIT,
            1, obsize, ibsize, _winapi.NMPWAIT_WAIT_FOREVER,
            # default security descriptor: the handle cannot be inherited
            _winapi.NULL
            )
        h2 = _winapi.CreateFile(
            address, access, 0, _winapi.NULL, _winapi.OPEN_EXISTING,
            _winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
            )
        _winapi.SetNamedPipeHandleState(
            h2, _winapi.PIPE_READMODE_MESSAGE, None, None
            )

        overlapped = _winapi.ConnectNamedPipe(h1, overlapped=True)
        _, err = overlapped.GetOverlappedResult(True)
        assert err == 0

        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.setblocking(True)
            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' and not util.is_abstract_socket_namespace(address):
            # Linux abstract socket namespaces do not need to be explicitly unlinked
            self._unlink = util.Finalize(
                self, os.unlink, args=(address,), exitpriority=0
                )
        else:
            self._unlink = None

    def accept(self):
        s, self._last_accepted = self._socket.accept()
        s.setblocking(True)
        return Connection(s.detach())

    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 = address_type(address)
    with socket.socket( getattr(socket, family) ) as s:
        s.setblocking(True)
        s.connect(address)
        return Connection(s.detach())

#
# 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
            self._handle_queue = [self._new_handle(first=True)]

            self._last_accepted = None
            util.sub_debug('listener created with address=%r', self._address)
            self.close = util.Finalize(
                self, PipeListener._finalize_pipe_listener,
                args=(self._handle_queue, self._address), exitpriority=0
                )

        def _new_handle(self, first=False):
            flags = _winapi.PIPE_ACCESS_DUPLEX | _winapi.FILE_FLAG_OVERLAPPED
            if first:
                flags |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE
            return _winapi.CreateNamedPipe(
                self._address, flags,
                _winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
                _winapi.PIPE_WAIT,
                _winapi.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
                _winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL
                )

        def accept(self):
            self._handle_queue.append(self._new_handle())
            handle = self._handle_queue.pop(0)
            try:
                ov = _winapi.ConnectNamedPipe(handle, overlapped=True)
            except OSError as e:
                if e.winerror != _winapi.ERROR_NO_DATA:
                    raise
                # ERROR_NO_DATA can occur if a client has already connected,
                # written data and then disconnected -- see Issue 14725.
            else:
                try:
                    res = _winapi.WaitForMultipleObjects(
                        [ov.event], False, INFINITE)
                except:
                    ov.cancel()
                    _winapi.CloseHandle(handle)
                    raise
                finally:
                    _, err = ov.GetOverlappedResult(True)
                    assert err == 0
            return PipeConnection(handle)

        @staticmethod
        def _finalize_pipe_listener(queue, address):
            util.sub_debug('closing listener with address=%r', address)
            for handle in queue:
                _winapi.CloseHandle(handle)

    def PipeClient(address):
        '''
        Return a connection object connected to the pipe given by `address`
        '''
        t = _init_timeout()
        while 1:
            try:
                _winapi.WaitNamedPipe(address, 1000)
                h = _winapi.CreateFile(
                    address, _winapi.GENERIC_READ | _winapi.GENERIC_WRITE,
                    0, _winapi.NULL, _winapi.OPEN_EXISTING,
                    _winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
                    )
            except OSError as e:
                if e.winerror not in (_winapi.ERROR_SEM_TIMEOUT,
                                      _winapi.ERROR_PIPE_BUSY) or _check_timeout(t):
                    raise
            else:
                break
        else:
            raise

        _winapi.SetNamedPipeHandleState(
            h, _winapi.PIPE_READMODE_MESSAGE, None, None
            )
        return PipeConnection(h)

#
# Authentication stuff
#

MESSAGE_LENGTH = 40  # MUST be &gt; 20

_CHALLENGE = b'#CHALLENGE#'
_WELCOME = b'#WELCOME#'
_FAILURE = b'#FAILURE#'

# multiprocessing.connection Authentication Handshake Protocol Description
# (as documented for reference after reading the existing code)
# =============================================================================
#
# On Windows: native pipes with &quot;overlapped IO&quot; are used to send the bytes,
# instead of the length prefix SIZE scheme described below. (ie: the OS deals
# with message sizes for us)
#
# Protocol error behaviors:
#
# On POSIX, any failure to receive the length prefix into SIZE, for SIZE greater
# than the requested maxsize to receive, or receiving fewer than SIZE bytes
# results in the connection being closed and auth to fail.
#
# On Windows, receiving too few bytes is never a low level _recv_bytes read
# error, receiving too many will trigger an error only if receive maxsize
# value was larger than 128 OR the if the data arrived in smaller pieces.
#
#      Serving side                           Client side
#     ------------------------------  ---------------------------------------
# 0.                                  Open a connection on the pipe.
# 1.  Accept connection.
# 2.  Random 20+ bytes -&gt; MESSAGE
#     Modern servers always send
#     more than 20 bytes and include
#     a {digest} prefix on it with
#     their preferred HMAC digest.
#     Legacy ones send ==20 bytes.
# 3.  send 4 byte length (net order)
#     prefix followed by:
#       b'#CHALLENGE#' + MESSAGE
# 4.                                  Receive 4 bytes, parse as network byte
#                                     order integer. If it is -1, receive an
#                                     additional 8 bytes, parse that as network
#                                     byte order. The result is the length of
#                                     the data that follows -&gt; SIZE.
# 5.                                  Receive min(SIZE, 256) bytes -&gt; M1
# 6.                                  Assert that M1 starts with:
#                                       b'#CHALLENGE#'
# 7.                                  Strip that prefix from M1 into -&gt; M2
# 7.1.                                Parse M2: if it is exactly 20 bytes in
#                                     length this indicates a legacy server
#                                     supporting only HMAC-MD5. Otherwise the
# 7.2.                                preferred digest is looked up from an
#                                     expected &quot;{digest}&quot; prefix on M2. No prefix
#                                     or unsupported digest? &lt;- AuthenticationError
# 7.3.                                Put divined algorithm name in -&gt; D_NAME
# 8.                                  Compute HMAC-D_NAME of AUTHKEY, M2 -&gt; C_DIGEST
# 9.                                  Send 4 byte length prefix (net order)
#                                     followed by C_DIGEST bytes.
# 10. Receive 4 or 4+8 byte length
#     prefix (#4 dance) -&gt; SIZE.
# 11. Receive min(SIZE, 256) -&gt; C_D.
# 11.1. Parse C_D: legacy servers
#     accept it as is, &quot;md5&quot; -&gt; D_NAME
# 11.2. modern servers check the length
#     of C_D, IF it is 16 bytes?
# 11.2.1. &quot;md5&quot; -&gt; D_NAME
#         and skip to step 12.
# 11.3. longer? expect and parse a &quot;{digest}&quot;
#     prefix into -&gt; D_NAME.
#     Strip the prefix and store remaining
#     bytes in -&gt; C_D.
# 11.4. Don't like D_NAME? &lt;- AuthenticationError
# 12. Compute HMAC-D_NAME of AUTHKEY,
#     MESSAGE into -&gt; M_DIGEST.
# 13. Compare M_DIGEST == C_D:
# 14a: Match? Send length prefix &amp;
#       b'#WELCOME#'
#    &lt;- RETURN
# 14b: Mismatch? Send len prefix &amp;
#       b'#FAILURE#'
#    &lt;- CLOSE &amp; AuthenticationError
# 15.                                 Receive 4 or 4+8 byte length prefix (net
#                                     order) again as in #4 into -&gt; SIZE.
# 16.                                 Receive min(SIZE, 256) bytes -&gt; M3.
# 17.                                 Compare M3 == b'#WELCOME#':
# 17a.                                Match? &lt;- RETURN
# 17b.                                Mismatch? &lt;- CLOSE &amp; AuthenticationError
#
# If this RETURNed, the connection remains open: it has been authenticated.
#
# Length prefixes are used consistently. Even on the legacy protocol, this
# was good fortune and allowed us to evolve the protocol by using the length
# of the opening challenge or length of the returned digest as a signal as
# to which protocol the other end supports.

_ALLOWED_DIGESTS = frozenset(
        {b'md5', b'sha256', b'sha384', b'sha3_256', b'sha3_384'})
_MAX_DIGEST_LEN = max(len(_) for _ in _ALLOWED_DIGESTS)

# Old hmac-md5 only server versions from Python &lt;=3.11 sent a message of this
# length. It happens to not match the length of any supported digest so we can
# use a message of this length to indicate that we should work in backwards
# compatible md5-only mode without a {digest_name} prefix on our response.
_MD5ONLY_MESSAGE_LENGTH = 20
_MD5_DIGEST_LEN = 16
_LEGACY_LENGTHS = (_MD5ONLY_MESSAGE_LENGTH, _MD5_DIGEST_LEN)


def _get_digest_name_and_payload(message):  # type: (bytes) -&gt; tuple[str, bytes]
    &quot;&quot;&quot;Returns a digest name and the payload for a response hash.

    If a legacy protocol is detected based on the message length
    or contents the digest name returned will be empty to indicate
    legacy mode where MD5 and no digest prefix should be sent.
    &quot;&quot;&quot;
    # modern message format: b&quot;{digest}payload&quot; longer than 20 bytes
    # legacy message format: 16 or 20 byte b&quot;payload&quot;
    if len(message) in _LEGACY_LENGTHS:
        # Either this was a legacy server challenge, or we're processing
        # a reply from a legacy client that sent an unprefixed 16-byte
        # HMAC-MD5 response. All messages using the modern protocol will
        # be longer than either of these lengths.
        return '', message
    if (message.startswith(b'{') and
        (curly := message.find(b'}', 1, _MAX_DIGEST_LEN+2)) &gt; 0):
        digest = message[1:curly]
        if digest in _ALLOWED_DIGESTS:
            payload = message[curly+1:]
            return digest.decode('ascii'), payload
    raise AuthenticationError(
            'unsupported message length, missing digest prefix, '
            f'or unsupported digest: {message=}')


def _create_response(authkey, message):
    &quot;&quot;&quot;Create a MAC based on authkey and message

    The MAC algorithm defaults to HMAC-MD5, unless MD5 is not available or
    the message has a '{digest_name}' prefix. For legacy HMAC-MD5, the response
    is the raw MAC, otherwise the response is prefixed with '{digest_name}',
    e.g. b'{sha256}abcdefg...'

    Note: The MAC protects the entire message including the digest_name prefix.
    &quot;&quot;&quot;
    import hmac
    digest_name = _get_digest_name_and_payload(message)[0]
    # The MAC protects the entire message: digest header and payload.
    if not digest_name:
        # Legacy server without a {digest} prefix on message.
        # Generate a legacy non-prefixed HMAC-MD5 reply.
        try:
            return hmac.new(authkey, message, 'md5').digest()
        except ValueError:
            # HMAC-MD5 is not available (FIPS mode?), fall back to
            # HMAC-SHA2-256 modern protocol. The legacy server probably
            # doesn't support it and will reject us anyways. :shrug:
            digest_name = 'sha256'
    # Modern protocol, indicate the digest used in the reply.
    response = hmac.new(authkey, message, digest_name).digest()
    return b'{%s}%s' % (digest_name.encode('ascii'), response)


def _verify_challenge(authkey, message, response):
    &quot;&quot;&quot;Verify MAC challenge

    If our message did not include a digest_name prefix, the client is allowed
    to select a stronger digest_name from _ALLOWED_DIGESTS.

    In case our message is prefixed, a client cannot downgrade to a weaker
    algorithm, because the MAC is calculated over the entire message
    including the '{digest_name}' prefix.
    &quot;&quot;&quot;
    import hmac
    response_digest, response_mac = _get_digest_name_and_payload(response)
    response_digest = response_digest or 'md5'
    try:
        expected = hmac.new(authkey, message, response_digest).digest()
    except ValueError:
        raise AuthenticationError(f'{response_digest=} unsupported')
    if len(expected) != len(response_mac):
        raise AuthenticationError(
                f'expected {response_digest!r} of length {len(expected)} '
                f'got {len(response_mac)}')
    if not hmac.compare_digest(expected, response_mac):
        raise AuthenticationError('digest received was wrong')


def deliver_challenge(connection, authkey: bytes, digest_name='sha256'):
    if not isinstance(authkey, bytes):
        raise ValueError(
            &quot;Authkey must be bytes, not {0!s}&quot;.format(type(authkey)))
    assert MESSAGE_LENGTH &gt; _MD5ONLY_MESSAGE_LENGTH, &quot;protocol constraint&quot;
    message = os.urandom(MESSAGE_LENGTH)
    message = b'{%s}%s' % (digest_name.encode('ascii'), message)
    # Even when sending a challenge to a legacy client that does not support
    # digest prefixes, they'll take the entire thing as a challenge and
    # respond to it with a raw HMAC-MD5.
    connection.send_bytes(_CHALLENGE + message)
    response = connection.recv_bytes(256)        # reject large message
    try:
        _verify_challenge(authkey, message, response)
    except AuthenticationError:
        connection.send_bytes(_FAILURE)
        raise
    else:
        connection.send_bytes(_WELCOME)


def answer_challenge(connection, authkey: bytes):
    if not isinstance(authkey, bytes):
        raise ValueError(
            &quot;Authkey must be bytes, not {0!s}&quot;.format(type(authkey)))
    message = connection.recv_bytes(256)         # reject large message
    if not message.startswith(_CHALLENGE):
        raise AuthenticationError(
                f'Protocol error, expected challenge: {message=}')
    message = message[len(_CHALLENGE):]
    if len(message) &lt; _MD5ONLY_MESSAGE_LENGTH:
        raise AuthenticationError(f'challenge too short: {len(message)} bytes')
    digest = _create_response(authkey, message)
    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('utf-8')

def _xml_loads(s):
    (obj,), method = xmlrpclib.loads(s.decode('utf-8'))
    return obj

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

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

#
# Wait
#

if sys.platform == 'win32':

    def _exhaustive_wait(handles, timeout):
        # Return ALL handles which are currently signalled.  (Only
        # returning the first signalled might create starvation issues.)
        L = list(handles)
        ready = []
        while L:
            res = _winapi.WaitForMultipleObjects(L, False, timeout)
            if res == WAIT_TIMEOUT:
                break
            elif WAIT_OBJECT_0 &lt;= res &lt; WAIT_OBJECT_0 + len(L):
                res -= WAIT_OBJECT_0
            elif WAIT_ABANDONED_0 &lt;= res &lt; WAIT_ABANDONED_0 + len(L):
                res -= WAIT_ABANDONED_0
            else:
                raise RuntimeError('Should not get here')
            ready.append(L[res])
            L = L[res+1:]
            timeout = 0
        return ready

    _ready_errors = {_winapi.ERROR_BROKEN_PIPE, _winapi.ERROR_NETNAME_DELETED}

    def wait(object_list, timeout=None):
        '''
        Wait till an object in object_list is ready/readable.

        Returns list of those objects in object_list which are ready/readable.
        '''
        if timeout is None:
            timeout = INFINITE
        elif timeout &lt; 0:
            timeout = 0
        else:
            timeout = int(timeout * 1000 + 0.5)

        object_list = list(object_list)
        waithandle_to_obj = {}
        ov_list = []
        ready_objects = set()
        ready_handles = set()

        try:
            for o in object_list:
                try:
                    fileno = getattr(o, 'fileno')
                except AttributeError:
                    waithandle_to_obj[o.__index__()] = o
                else:
                    # start an overlapped read of length zero
                    try:
                        ov, err = _winapi.ReadFile(fileno(), 0, True)
                    except OSError as e:
                        ov, err = None, e.winerror
                        if err not in _ready_errors:
                            raise
                    if err == _winapi.ERROR_IO_PENDING:
                        ov_list.append(ov)
                        waithandle_to_obj[ov.event] = o
                    else:
                        # If o.fileno() is an overlapped pipe handle and
                        # err == 0 then there is a zero length message
                        # in the pipe, but it HAS NOT been consumed...
                        if ov and sys.getwindowsversion()[:2] &gt;= (6, 2):
                            # ... except on Windows 8 and later, where
                            # the message HAS been consumed.
                            try:
                                _, err = ov.GetOverlappedResult(False)
                            except OSError as e:
                                err = e.winerror
                            if not err and hasattr(o, '_got_empty_message'):
                                o._got_empty_message = True
                        ready_objects.add(o)
                        timeout = 0

            ready_handles = _exhaustive_wait(waithandle_to_obj.keys(), timeout)
        finally:
            # request that overlapped reads stop
            for ov in ov_list:
                ov.cancel()

            # wait for all overlapped reads to stop
            for ov in ov_list:
                try:
                    _, err = ov.GetOverlappedResult(True)
                except OSError as e:
                    err = e.winerror
                    if err not in _ready_errors:
                        raise
                if err != _winapi.ERROR_OPERATION_ABORTED:
                    o = waithandle_to_obj[ov.event]
                    ready_objects.add(o)
                    if err == 0:
                        # If o.fileno() is an overlapped pipe handle then
                        # a zero length message HAS been consumed.
                        if hasattr(o, '_got_empty_message'):
                            o._got_empty_message = True

        ready_objects.update(waithandle_to_obj[h] for h in ready_handles)
        return [o for o in object_list if o in ready_objects]

else:

    import selectors

    # 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'):
        _WaitSelector = selectors.PollSelector
    else:
        _WaitSelector = selectors.SelectSelector

    def wait(object_list, timeout=None):
        '''
        Wait till an object in object_list is ready/readable.

        Returns list of those objects in object_list which are ready/readable.
        '''
        with _WaitSelector() as selector:
            for obj in object_list:
                selector.register(obj, selectors.EVENT_READ)

            if timeout is not None:
                deadline = time.monotonic() + timeout

            while True:
                ready = selector.select(timeout)
                if ready:
                    return [key.fileobj for (key, events) in ready]
                else:
                    if timeout is not None:
                        timeout = deadline - time.monotonic()
                        if timeout &lt; 0:
                            return ready

#
# Make connection and socket objects shareable if possible
#

if sys.platform == 'win32':
    def reduce_connection(conn):
        handle = conn.fileno()
        with socket.fromfd(handle, socket.AF_INET, socket.SOCK_STREAM) as s:
            from . import resource_sharer
            ds = resource_sharer.DupSocket(s)
            return rebuild_connection, (ds, conn.readable, conn.writable)
    def rebuild_connection(ds, readable, writable):
        sock = ds.detach()
        return Connection(sock.detach(), readable, writable)
    reduction.register(Connection, reduce_connection)

    def reduce_pipe_connection(conn):
        access = ((_winapi.FILE_GENERIC_READ if conn.readable else 0) |
                  (_winapi.FILE_GENERIC_WRITE if conn.writable else 0))
        dh = reduction.DupHandle(conn.fileno(), access)
        return rebuild_pipe_connection, (dh, conn.readable, conn.writable)
    def rebuild_pipe_connection(dh, readable, writable):
        handle = dh.detach()
        return PipeConnection(handle, readable, writable)
    reduction.register(PipeConnection, reduce_pipe_connection)

else:
    def reduce_connection(conn):
        df = reduction.DupFd(conn.fileno())
        return rebuild_connection, (df, conn.readable, conn.writable)
    def rebuild_connection(df, readable, writable):
        fd = df.detach()
        return Connection(fd, readable, writable)
    reduction.register(Connection, reduce_connection)
                                                                          opt/alt/python-internal/lib64/python3.11/multiprocessing/connection.py                              0000644                 00000077213 15052012062 0021770 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       #
# 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.
#

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

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

import _multiprocessing

from . import util

from . import AuthenticationError, BufferTooShort
from .context import reduction
_ForkingPickler = reduction.ForkingPickler

try:
    import _winapi
    from _winapi import WAIT_OBJECT_0, WAIT_ABANDONED_0, WAIT_TIMEOUT, INFINITE
except ImportError:
    if sys.platform == 'win32':
        raise
    _winapi = 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 time.monotonic() + timeout

def _check_timeout(t):
    return time.monotonic() &gt; 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=util.get_temp_dir())
    elif family == 'AF_PIPE':
        return tempfile.mktemp(prefix=r'\\.\pipe\pyc-%d-%d-' %
                               (os.getpid(), next(_mmap_counter)), dir=&quot;&quot;)
    else:
        raise ValueError('unrecognized family')

def _validate_family(family):
    '''
    Checks if the family is valid for the current environment.
    '''
    if sys.platform != 'win32' and family == 'AF_PIPE':
        raise ValueError('Family %s is not recognized.' % family)

    if sys.platform == 'win32' and family == 'AF_UNIX':
        # double check
        if not hasattr(socket, family):
            raise ValueError('Family %s is not recognized.' % 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 or util.is_abstract_socket_namespace(address):
        return 'AF_UNIX'
    else:
        raise ValueError('address type of %r unrecognized' % address)

#
# Connection classes
#

class _ConnectionBase:
    _handle = None

    def __init__(self, handle, readable=True, writable=True):
        handle = handle.__index__()
        if handle &lt; 0:
            raise ValueError(&quot;invalid handle&quot;)
        if not readable and not writable:
            raise ValueError(
                &quot;at least one of `readable` and `writable` must be True&quot;)
        self._handle = handle
        self._readable = readable
        self._writable = writable

    # XXX should we use util.Finalize instead of a __del__?

    def __del__(self):
        if self._handle is not None:
            self._close()

    def _check_closed(self):
        if self._handle is None:
            raise OSError(&quot;handle is closed&quot;)

    def _check_readable(self):
        if not self._readable:
            raise OSError(&quot;connection is write-only&quot;)

    def _check_writable(self):
        if not self._writable:
            raise OSError(&quot;connection is read-only&quot;)

    def _bad_message_length(self):
        if self._writable:
            self._readable = False
        else:
            self.close()
        raise OSError(&quot;bad message length&quot;)

    @property
    def closed(self):
        &quot;&quot;&quot;True if the connection is closed&quot;&quot;&quot;
        return self._handle is None

    @property
    def readable(self):
        &quot;&quot;&quot;True if the connection is readable&quot;&quot;&quot;
        return self._readable

    @property
    def writable(self):
        &quot;&quot;&quot;True if the connection is writable&quot;&quot;&quot;
        return self._writable

    def fileno(self):
        &quot;&quot;&quot;File descriptor or handle of the connection&quot;&quot;&quot;
        self._check_closed()
        return self._handle

    def close(self):
        &quot;&quot;&quot;Close the connection&quot;&quot;&quot;
        if self._handle is not None:
            try:
                self._close()
            finally:
                self._handle = None

    def send_bytes(self, buf, offset=0, size=None):
        &quot;&quot;&quot;Send the bytes data from a bytes-like object&quot;&quot;&quot;
        self._check_closed()
        self._check_writable()
        m = memoryview(buf)
        if m.itemsize &gt; 1:
            m = m.cast('B')
        n = m.nbytes
        if offset &lt; 0:
            raise ValueError(&quot;offset is negative&quot;)
        if n &lt; offset:
            raise ValueError(&quot;buffer length &lt; offset&quot;)
        if size is None:
            size = n - offset
        elif size &lt; 0:
            raise ValueError(&quot;size is negative&quot;)
        elif offset + size &gt; n:
            raise ValueError(&quot;buffer length &lt; offset + size&quot;)
        self._send_bytes(m[offset:offset + size])

    def send(self, obj):
        &quot;&quot;&quot;Send a (picklable) object&quot;&quot;&quot;
        self._check_closed()
        self._check_writable()
        self._send_bytes(_ForkingPickler.dumps(obj))

    def recv_bytes(self, maxlength=None):
        &quot;&quot;&quot;
        Receive bytes data as a bytes object.
        &quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        if maxlength is not None and maxlength &lt; 0:
            raise ValueError(&quot;negative maxlength&quot;)
        buf = self._recv_bytes(maxlength)
        if buf is None:
            self._bad_message_length()
        return buf.getvalue()

    def recv_bytes_into(self, buf, offset=0):
        &quot;&quot;&quot;
        Receive bytes data into a writeable bytes-like object.
        Return the number of bytes read.
        &quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        with memoryview(buf) as m:
            # Get bytesize of arbitrary buffer
            itemsize = m.itemsize
            bytesize = itemsize * len(m)
            if offset &lt; 0:
                raise ValueError(&quot;negative offset&quot;)
            elif offset &gt; bytesize:
                raise ValueError(&quot;offset too large&quot;)
            result = self._recv_bytes()
            size = result.tell()
            if bytesize &lt; offset + size:
                raise BufferTooShort(result.getvalue())
            # Message can fit in dest
            result.seek(0)
            result.readinto(m[offset // itemsize :
                              (offset + size) // itemsize])
            return size

    def recv(self):
        &quot;&quot;&quot;Receive a (picklable) object&quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        buf = self._recv_bytes()
        return _ForkingPickler.loads(buf.getbuffer())

    def poll(self, timeout=0.0):
        &quot;&quot;&quot;Whether there is any input available to be read&quot;&quot;&quot;
        self._check_closed()
        self._check_readable()
        return self._poll(timeout)

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, exc_tb):
        self.close()


if _winapi:

    class PipeConnection(_ConnectionBase):
        &quot;&quot;&quot;
        Connection class based on a Windows named pipe.
        Overlapped I/O is used, so the handles must have been created
        with FILE_FLAG_OVERLAPPED.
        &quot;&quot;&quot;
        _got_empty_message = False
        _send_ov = None

        def _close(self, _CloseHandle=_winapi.CloseHandle):
            ov = self._send_ov
            if ov is not None:
                # Interrupt WaitForMultipleObjects() in _send_bytes()
                ov.cancel()
            _CloseHandle(self._handle)

        def _send_bytes(self, buf):
            if self._send_ov is not None:
                # A connection should only be used by a single thread
                raise ValueError(&quot;concurrent send_bytes() calls &quot;
                                 &quot;are not supported&quot;)
            ov, err = _winapi.WriteFile(self._handle, buf, overlapped=True)
            self._send_ov = ov
            try:
                if err == _winapi.ERROR_IO_PENDING:
                    waitres = _winapi.WaitForMultipleObjects(
                        [ov.event], False, INFINITE)
                    assert waitres == WAIT_OBJECT_0
            except:
                ov.cancel()
                raise
            finally:
                self._send_ov = None
                nwritten, err = ov.GetOverlappedResult(True)
            if err == _winapi.ERROR_OPERATION_ABORTED:
                # close() was called by another thread while
                # WaitForMultipleObjects() was waiting for the overlapped
                # operation.
                raise OSError(errno.EPIPE, &quot;handle is closed&quot;)
            assert err == 0
            assert nwritten == len(buf)

        def _recv_bytes(self, maxsize=None):
            if self._got_empty_message:
                self._got_empty_message = False
                return io.BytesIO()
            else:
                bsize = 128 if maxsize is None else min(maxsize, 128)
                try:
                    ov, err = _winapi.ReadFile(self._handle, bsize,
                                                overlapped=True)
                    try:
                        if err == _winapi.ERROR_IO_PENDING:
                            waitres = _winapi.WaitForMultipleObjects(
                                [ov.event], False, INFINITE)
                            assert waitres == WAIT_OBJECT_0
                    except:
                        ov.cancel()
                        raise
                    finally:
                        nread, err = ov.GetOverlappedResult(True)
                        if err == 0:
                            f = io.BytesIO()
                            f.write(ov.getbuffer())
                            return f
                        elif err == _winapi.ERROR_MORE_DATA:
                            return self._get_more_data(ov, maxsize)
                except OSError as e:
                    if e.winerror == _winapi.ERROR_BROKEN_PIPE:
                        raise EOFError
                    else:
                        raise
            raise RuntimeError(&quot;shouldn't get here; expected KeyboardInterrupt&quot;)

        def _poll(self, timeout):
            if (self._got_empty_message or
                        _winapi.PeekNamedPipe(self._handle)[0] != 0):
                return True
            return bool(wait([self], timeout))

        def _get_more_data(self, ov, maxsize):
            buf = ov.getbuffer()
            f = io.BytesIO()
            f.write(buf)
            left = _winapi.PeekNamedPipe(self._handle)[1]
            assert left &gt; 0
            if maxsize is not None and len(buf) + left &gt; maxsize:
                self._bad_message_length()
            ov, err = _winapi.ReadFile(self._handle, left, overlapped=True)
            rbytes, err = ov.GetOverlappedResult(True)
            assert err == 0
            assert rbytes == left
            f.write(ov.getbuffer())
            return f


class Connection(_ConnectionBase):
    &quot;&quot;&quot;
    Connection class based on an arbitrary file descriptor (Unix only), or
    a socket handle (Windows).
    &quot;&quot;&quot;

    if _winapi:
        def _close(self, _close=_multiprocessing.closesocket):
            _close(self._handle)
        _write = _multiprocessing.send
        _read = _multiprocessing.recv
    else:
        def _close(self, _close=os.close):
            _close(self._handle)
        _write = os.write
        _read = os.read

    def _send(self, buf, write=_write):
        remaining = len(buf)
        while True:
            n = write(self._handle, buf)
            remaining -= n
            if remaining == 0:
                break
            buf = buf[n:]

    def _recv(self, size, read=_read):
        buf = io.BytesIO()
        handle = self._handle
        remaining = size
        while remaining &gt; 0:
            chunk = read(handle, remaining)
            n = len(chunk)
            if n == 0:
                if remaining == size:
                    raise EOFError
                else:
                    raise OSError(&quot;got end of file during message&quot;)
            buf.write(chunk)
            remaining -= n
        return buf

    def _send_bytes(self, buf):
        n = len(buf)
        if n &gt; 0x7fffffff:
            pre_header = struct.pack(&quot;!i&quot;, -1)
            header = struct.pack(&quot;!Q&quot;, n)
            self._send(pre_header)
            self._send(header)
            self._send(buf)
        else:
            # For wire compatibility with 3.7 and lower
            header = struct.pack(&quot;!i&quot;, n)
            if n &gt; 16384:
                # The payload is large so Nagle's algorithm won't be triggered
                # and we'd better avoid the cost of concatenation.
                self._send(header)
                self._send(buf)
            else:
                # Issue #20540: concatenate before sending, to avoid delays due
                # to Nagle's algorithm on a TCP socket.
                # Also note we want to avoid sending a 0-length buffer separately,
                # to avoid &quot;broken pipe&quot; errors if the other end closed the pipe.
                self._send(header + buf)

    def _recv_bytes(self, maxsize=None):
        buf = self._recv(4)
        size, = struct.unpack(&quot;!i&quot;, buf.getvalue())
        if size == -1:
            buf = self._recv(8)
            size, = struct.unpack(&quot;!Q&quot;, buf.getvalue())
        if maxsize is not None and size &gt; maxsize:
            return None
        return self._recv(size)

    def _poll(self, timeout):
        r = wait([self], timeout)
        return bool(r)


#
# 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)

        _validate_family(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 OSError('listener is closed')

        c = self._listener.accept()
        if self._authkey is not None:
            deliver_challenge(c, self._authkey)
            answer_challenge(c, self._authkey)
        return c

    def close(self):
        '''
        Close the bound socket or named pipe of `self`.
        '''
        listener = self._listener
        if listener is not None:
            self._listener = None
            listener.close()

    @property
    def address(self):
        return self._listener._address

    @property
    def last_accepted(self):
        return self._listener._last_accepted

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, exc_tb):
        self.close()


def Client(address, family=None, authkey=None):
    '''
    Returns a connection to the address of a `Listener`
    '''
    family = family or address_type(address)
    _validate_family(family)
    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 = Connection(s1.detach())
            c2 = Connection(s2.detach())
        else:
            fd1, fd2 = os.pipe()
            c1 = Connection(fd1, writable=False)
            c2 = Connection(fd2, readable=False)

        return c1, c2

else:

    def Pipe(duplex=True):
        '''
        Returns pair of connection objects at either end of a pipe
        '''
        address = arbitrary_address('AF_PIPE')
        if duplex:
            openmode = _winapi.PIPE_ACCESS_DUPLEX
            access = _winapi.GENERIC_READ | _winapi.GENERIC_WRITE
            obsize, ibsize = BUFSIZE, BUFSIZE
        else:
            openmode = _winapi.PIPE_ACCESS_INBOUND
            access = _winapi.GENERIC_WRITE
            obsize, ibsize = 0, BUFSIZE

        h1 = _winapi.CreateNamedPipe(
            address, openmode | _winapi.FILE_FLAG_OVERLAPPED |
            _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE,
            _winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
            _winapi.PIPE_WAIT,
            1, obsize, ibsize, _winapi.NMPWAIT_WAIT_FOREVER,
            # default security descriptor: the handle cannot be inherited
            _winapi.NULL
            )
        h2 = _winapi.CreateFile(
            address, access, 0, _winapi.NULL, _winapi.OPEN_EXISTING,
            _winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
            )
        _winapi.SetNamedPipeHandleState(
            h2, _winapi.PIPE_READMODE_MESSAGE, None, None
            )

        overlapped = _winapi.ConnectNamedPipe(h1, overlapped=True)
        _, err = overlapped.GetOverlappedResult(True)
        assert err == 0

        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.setblocking(True)
            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' and not util.is_abstract_socket_namespace(address):
            # Linux abstract socket namespaces do not need to be explicitly unlinked
            self._unlink = util.Finalize(
                self, os.unlink, args=(address,), exitpriority=0
                )
        else:
            self._unlink = None

    def accept(self):
        s, self._last_accepted = self._socket.accept()
        s.setblocking(True)
        return Connection(s.detach())

    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 = address_type(address)
    with socket.socket( getattr(socket, family) ) as s:
        s.setblocking(True)
        s.connect(address)
        return Connection(s.detach())

#
# 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
            self._handle_queue = [self._new_handle(first=True)]

            self._last_accepted = None
            util.sub_debug('listener created with address=%r', self._address)
            self.close = util.Finalize(
                self, PipeListener._finalize_pipe_listener,
                args=(self._handle_queue, self._address), exitpriority=0
                )

        def _new_handle(self, first=False):
            flags = _winapi.PIPE_ACCESS_DUPLEX | _winapi.FILE_FLAG_OVERLAPPED
            if first:
                flags |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE
            return _winapi.CreateNamedPipe(
                self._address, flags,
                _winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
                _winapi.PIPE_WAIT,
                _winapi.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
                _winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL
                )

        def accept(self):
            self._handle_queue.append(self._new_handle())
            handle = self._handle_queue.pop(0)
            try:
                ov = _winapi.ConnectNamedPipe(handle, overlapped=True)
            except OSError as e:
                if e.winerror != _winapi.ERROR_NO_DATA:
                    raise
                # ERROR_NO_DATA can occur if a client has already connected,
                # written data and then disconnected -- see Issue 14725.
            else:
                try:
                    res = _winapi.WaitForMultipleObjects(
                        [ov.event], False, INFINITE)
                except:
                    ov.cancel()
                    _winapi.CloseHandle(handle)
                    raise
                finally:
                    _, err = ov.GetOverlappedResult(True)
                    assert err == 0
            return PipeConnection(handle)

        @staticmethod
        def _finalize_pipe_listener(queue, address):
            util.sub_debug('closing listener with address=%r', address)
            for handle in queue:
                _winapi.CloseHandle(handle)

    def PipeClient(address):
        '''
        Return a connection object connected to the pipe given by `address`
        '''
        t = _init_timeout()
        while 1:
            try:
                _winapi.WaitNamedPipe(address, 1000)
                h = _winapi.CreateFile(
                    address, _winapi.GENERIC_READ | _winapi.GENERIC_WRITE,
                    0, _winapi.NULL, _winapi.OPEN_EXISTING,
                    _winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
                    )
            except OSError as e:
                if e.winerror not in (_winapi.ERROR_SEM_TIMEOUT,
                                      _winapi.ERROR_PIPE_BUSY) or _check_timeout(t):
                    raise
            else:
                break
        else:
            raise

        _winapi.SetNamedPipeHandleState(
            h, _winapi.PIPE_READMODE_MESSAGE, None, None
            )
        return PipeConnection(h)

#
# Authentication stuff
#

MESSAGE_LENGTH = 20

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

def deliver_challenge(connection, authkey):
    import hmac
    if not isinstance(authkey, bytes):
        raise ValueError(
            &quot;Authkey must be bytes, not {0!s}&quot;.format(type(authkey)))
    message = os.urandom(MESSAGE_LENGTH)
    connection.send_bytes(CHALLENGE + message)
    digest = hmac.new(authkey, message, 'md5').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
    if not isinstance(authkey, bytes):
        raise ValueError(
            &quot;Authkey must be bytes, not {0!s}&quot;.format(type(authkey)))
    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, 'md5').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('utf-8')

def _xml_loads(s):
    (obj,), method = xmlrpclib.loads(s.decode('utf-8'))
    return obj

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

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

#
# Wait
#

if sys.platform == 'win32':

    def _exhaustive_wait(handles, timeout):
        # Return ALL handles which are currently signalled.  (Only
        # returning the first signalled might create starvation issues.)
        L = list(handles)
        ready = []
        while L:
            res = _winapi.WaitForMultipleObjects(L, False, timeout)
            if res == WAIT_TIMEOUT:
                break
            elif WAIT_OBJECT_0 &lt;= res &lt; WAIT_OBJECT_0 + len(L):
                res -= WAIT_OBJECT_0
            elif WAIT_ABANDONED_0 &lt;= res &lt; WAIT_ABANDONED_0 + len(L):
                res -= WAIT_ABANDONED_0
            else:
                raise RuntimeError('Should not get here')
            ready.append(L[res])
            L = L[res+1:]
            timeout = 0
        return ready

    _ready_errors = {_winapi.ERROR_BROKEN_PIPE, _winapi.ERROR_NETNAME_DELETED}

    def wait(object_list, timeout=None):
        '''
        Wait till an object in object_list is ready/readable.

        Returns list of those objects in object_list which are ready/readable.
        '''
        if timeout is None:
            timeout = INFINITE
        elif timeout &lt; 0:
            timeout = 0
        else:
            timeout = int(timeout * 1000 + 0.5)

        object_list = list(object_list)
        waithandle_to_obj = {}
        ov_list = []
        ready_objects = set()
        ready_handles = set()

        try:
            for o in object_list:
                try:
                    fileno = getattr(o, 'fileno')
                except AttributeError:
                    waithandle_to_obj[o.__index__()] = o
                else:
                    # start an overlapped read of length zero
                    try:
                        ov, err = _winapi.ReadFile(fileno(), 0, True)
                    except OSError as e:
                        ov, err = None, e.winerror
                        if err not in _ready_errors:
                            raise
                    if err == _winapi.ERROR_IO_PENDING:
                        ov_list.append(ov)
                        waithandle_to_obj[ov.event] = o
                    else:
                        # If o.fileno() is an overlapped pipe handle and
                        # err == 0 then there is a zero length message
                        # in the pipe, but it HAS NOT been consumed...
                        if ov and sys.getwindowsversion()[:2] &gt;= (6, 2):
                            # ... except on Windows 8 and later, where
                            # the message HAS been consumed.
                            try:
                                _, err = ov.GetOverlappedResult(False)
                            except OSError as e:
                                err = e.winerror
                            if not err and hasattr(o, '_got_empty_message'):
                                o._got_empty_message = True
                        ready_objects.add(o)
                        timeout = 0

            ready_handles = _exhaustive_wait(waithandle_to_obj.keys(), timeout)
        finally:
            # request that overlapped reads stop
            for ov in ov_list:
                ov.cancel()

            # wait for all overlapped reads to stop
            for ov in ov_list:
                try:
                    _, err = ov.GetOverlappedResult(True)
                except OSError as e:
                    err = e.winerror
                    if err not in _ready_errors:
                        raise
                if err != _winapi.ERROR_OPERATION_ABORTED:
                    o = waithandle_to_obj[ov.event]
                    ready_objects.add(o)
                    if err == 0:
                        # If o.fileno() is an overlapped pipe handle then
                        # a zero length message HAS been consumed.
                        if hasattr(o, '_got_empty_message'):
                            o._got_empty_message = True

        ready_objects.update(waithandle_to_obj[h] for h in ready_handles)
        return [o for o in object_list if o in ready_objects]

else:

    import selectors

    # 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'):
        _WaitSelector = selectors.PollSelector
    else:
        _WaitSelector = selectors.SelectSelector

    def wait(object_list, timeout=None):
        '''
        Wait till an object in object_list is ready/readable.

        Returns list of those objects in object_list which are ready/readable.
        '''
        with _WaitSelector() as selector:
            for obj in object_list:
                selector.register(obj, selectors.EVENT_READ)

            if timeout is not None:
                deadline = time.monotonic() + timeout

            while True:
                ready = selector.select(timeout)
                if ready:
                    return [key.fileobj for (key, events) in ready]
                else:
                    if timeout is not None:
                        timeout = deadline - time.monotonic()
                        if timeout &lt; 0:
                            return ready

#
# Make connection and socket objects shareable if possible
#

if sys.platform == 'win32':
    def reduce_connection(conn):
        handle = conn.fileno()
        with socket.fromfd(handle, socket.AF_INET, socket.SOCK_STREAM) as s:
            from . import resource_sharer
            ds = resource_sharer.DupSocket(s)
            return rebuild_connection, (ds, conn.readable, conn.writable)
    def rebuild_connection(ds, readable, writable):
        sock = ds.detach()
        return Connection(sock.detach(), readable, writable)
    reduction.register(Connection, reduce_connection)

    def reduce_pipe_connection(conn):
        access = ((_winapi.FILE_GENERIC_READ if conn.readable else 0) |
                  (_winapi.FILE_GENERIC_WRITE if conn.writable else 0))
        dh = reduction.DupHandle(conn.fileno(), access)
        return rebuild_pipe_connection, (dh, conn.readable, conn.writable)
    def rebuild_pipe_connection(dh, readable, writable):
        handle = dh.detach()
        return PipeConnection(handle, readable, writable)
    reduction.register(PipeConnection, reduce_pipe_connection)

else:
    def reduce_connection(conn):
        df = reduction.DupFd(conn.fileno())
        return rebuild_connection, (df, conn.readable, conn.writable)
    def rebuild_connection(df, readable, writable):
        fd = df.detach()
        return Connection(fd, readable, writable)
    reduction.register(Connection, reduce_connection)
                                                                                                                                                                                                                                                                                                                                                                                     opt/hc_python/lib/python3.12/site-packages/urllib3/connection.py                                    0000644                 00000115703 15052121140 0020537 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       from __future__ import annotations

import datetime
import http.client
import logging
import os
import re
import socket
import sys
import threading
import typing
import warnings
from http.client import HTTPConnection as _HTTPConnection
from http.client import HTTPException as HTTPException  # noqa: F401
from http.client import ResponseNotReady
from socket import timeout as SocketTimeout

if typing.TYPE_CHECKING:
    from .response import HTTPResponse
    from .util.ssl_ import _TYPE_PEER_CERT_RET_DICT
    from .util.ssltransport import SSLTransport

from ._collections import HTTPHeaderDict
from .http2 import probe as http2_probe
from .util.response import assert_header_parsing
from .util.timeout import _DEFAULT_TIMEOUT, _TYPE_TIMEOUT, Timeout
from .util.util import to_str
from .util.wait import wait_for_read

try:  # Compiled with SSL?
    import ssl

    BaseSSLError = ssl.SSLError
except (ImportError, AttributeError):
    ssl = None  # type: ignore[assignment]

    class BaseSSLError(BaseException):  # type: ignore[no-redef]
        pass


from ._base_connection import _TYPE_BODY
from ._base_connection import ProxyConfig as ProxyConfig
from ._base_connection import _ResponseOptions as _ResponseOptions
from ._version import __version__
from .exceptions import (
    ConnectTimeoutError,
    HeaderParsingError,
    NameResolutionError,
    NewConnectionError,
    ProxyError,
    SystemTimeWarning,
)
from .util import SKIP_HEADER, SKIPPABLE_HEADERS, connection, ssl_
from .util.request import body_to_chunks
from .util.ssl_ import assert_fingerprint as _assert_fingerprint
from .util.ssl_ import (
    create_urllib3_context,
    is_ipaddress,
    resolve_cert_reqs,
    resolve_ssl_version,
    ssl_wrap_socket,
)
from .util.ssl_match_hostname import CertificateError, match_hostname
from .util.url import Url

# Not a no-op, we're adding this to the namespace so it can be imported.
ConnectionError = ConnectionError
BrokenPipeError = BrokenPipeError


log = logging.getLogger(__name__)

port_by_scheme = {&quot;http&quot;: 80, &quot;https&quot;: 443}

# When it comes time to update this value as a part of regular maintenance
# (ie test_recent_date is failing) update it to ~6 months before the current date.
RECENT_DATE = datetime.date(2023, 6, 1)

_CONTAINS_CONTROL_CHAR_RE = re.compile(r&quot;[^-!#$%&amp;'*+.^_`|~0-9a-zA-Z]&quot;)


class HTTPConnection(_HTTPConnection):
    &quot;&quot;&quot;
    Based on :class:`http.client.HTTPConnection` but provides an extra constructor
    backwards-compatibility layer between older and newer Pythons.

    Additional keyword parameters are used to configure attributes of the connection.
    Accepted parameters include:

    - ``source_address``: Set the source address for the current connection.
    - ``socket_options``: Set specific options on the underlying socket. If not specified, then
      defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling
      Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.

      For example, if you wish to enable TCP Keep Alive in addition to the defaults,
      you might pass:

      .. code-block:: python

         HTTPConnection.default_socket_options + [
             (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
         ]

      Or you may want to disable the defaults by passing an empty list (e.g., ``[]``).
    &quot;&quot;&quot;

    default_port: typing.ClassVar[int] = port_by_scheme[&quot;http&quot;]  # type: ignore[misc]

    #: Disable Nagle's algorithm by default.
    #: ``[(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]``
    default_socket_options: typing.ClassVar[connection._TYPE_SOCKET_OPTIONS] = [
        (socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
    ]

    #: Whether this connection verifies the host's certificate.
    is_verified: bool = False

    #: Whether this proxy connection verified the proxy host's certificate.
    # If no proxy is currently connected to the value will be ``None``.
    proxy_is_verified: bool | None = None

    blocksize: int
    source_address: tuple[str, int] | None
    socket_options: connection._TYPE_SOCKET_OPTIONS | None

    _has_connected_to_proxy: bool
    _response_options: _ResponseOptions | None
    _tunnel_host: str | None
    _tunnel_port: int | None
    _tunnel_scheme: str | None

    def __init__(
        self,
        host: str,
        port: int | None = None,
        *,
        timeout: _TYPE_TIMEOUT = _DEFAULT_TIMEOUT,
        source_address: tuple[str, int] | None = None,
        blocksize: int = 16384,
        socket_options: None | (
            connection._TYPE_SOCKET_OPTIONS
        ) = default_socket_options,
        proxy: Url | None = None,
        proxy_config: ProxyConfig | None = None,
    ) -&gt; None:
        super().__init__(
            host=host,
            port=port,
            timeout=Timeout.resolve_default_timeout(timeout),
            source_address=source_address,
            blocksize=blocksize,
        )
        self.socket_options = socket_options
        self.proxy = proxy
        self.proxy_config = proxy_config

        self._has_connected_to_proxy = False
        self._response_options = None
        self._tunnel_host: str | None = None
        self._tunnel_port: int | None = None
        self._tunnel_scheme: str | None = None

    @property
    def host(self) -&gt; str:
        &quot;&quot;&quot;
        Getter method to remove any trailing dots that indicate the hostname is an FQDN.

        In general, SSL certificates don't include the trailing dot indicating a
        fully-qualified domain name, and thus, they don't validate properly when
        checked against a domain name that includes the dot. In addition, some
        servers may not expect to receive the trailing dot when provided.

        However, the hostname with trailing dot is critical to DNS resolution; doing a
        lookup with the trailing dot will properly only resolve the appropriate FQDN,
        whereas a lookup without a trailing dot will search the system's search domain
        list. Thus, it's important to keep the original host around for use only in
        those cases where it's appropriate (i.e., when doing DNS lookup to establish the
        actual TCP connection across which we're going to send HTTP requests).
        &quot;&quot;&quot;
        return self._dns_host.rstrip(&quot;.&quot;)

    @host.setter
    def host(self, value: str) -&gt; None:
        &quot;&quot;&quot;
        Setter for the `host` property.

        We assume that only urllib3 uses the _dns_host attribute; httplib itself
        only uses `host`, and it seems reasonable that other libraries follow suit.
        &quot;&quot;&quot;
        self._dns_host = value

    def _new_conn(self) -&gt; socket.socket:
        &quot;&quot;&quot;Establish a socket connection and set nodelay settings on it.

        :return: New socket connection.
        &quot;&quot;&quot;
        try:
            sock = connection.create_connection(
                (self._dns_host, self.port),
                self.timeout,
                source_address=self.source_address,
                socket_options=self.socket_options,
            )
        except socket.gaierror as e:
            raise NameResolutionError(self.host, self, e) from e
        except SocketTimeout as e:
            raise ConnectTimeoutError(
                self,
                f&quot;Connection to {self.host} timed out. (connect timeout={self.timeout})&quot;,
            ) from e

        except OSError as e:
            raise NewConnectionError(
                self, f&quot;Failed to establish a new connection: {e}&quot;
            ) from e

        sys.audit(&quot;http.client.connect&quot;, self, self.host, self.port)

        return sock

    def set_tunnel(
        self,
        host: str,
        port: int | None = None,
        headers: typing.Mapping[str, str] | None = None,
        scheme: str = &quot;http&quot;,
    ) -&gt; None:
        if scheme not in (&quot;http&quot;, &quot;https&quot;):
            raise ValueError(
                f&quot;Invalid proxy scheme for tunneling: {scheme!r}, must be either 'http' or 'https'&quot;
            )
        super().set_tunnel(host, port=port, headers=headers)
        self._tunnel_scheme = scheme

    if sys.version_info &lt; (3, 11, 4):

        def _tunnel(self) -&gt; None:
            _MAXLINE = http.client._MAXLINE  # type: ignore[attr-defined]
            connect = b&quot;CONNECT %s:%d HTTP/1.0\r\n&quot; % (  # type: ignore[str-format]
                self._tunnel_host.encode(&quot;ascii&quot;),  # type: ignore[union-attr]
                self._tunnel_port,
            )
            headers = [connect]
            for header, value in self._tunnel_headers.items():  # type: ignore[attr-defined]
                headers.append(f&quot;{header}: {value}\r\n&quot;.encode(&quot;latin-1&quot;))
            headers.append(b&quot;\r\n&quot;)
            # Making a single send() call instead of one per line encourages
            # the host OS to use a more optimal packet size instead of
            # potentially emitting a series of small packets.
            self.send(b&quot;&quot;.join(headers))
            del headers

            response = self.response_class(self.sock, method=self._method)  # type: ignore[attr-defined]
            try:
                (version, code, message) = response._read_status()  # type: ignore[attr-defined]

                if code != http.HTTPStatus.OK:
                    self.close()
                    raise OSError(f&quot;Tunnel connection failed: {code} {message.strip()}&quot;)
                while True:
                    line = response.fp.readline(_MAXLINE + 1)
                    if len(line) &gt; _MAXLINE:
                        raise http.client.LineTooLong(&quot;header line&quot;)
                    if not line:
                        # for sites which EOF without sending a trailer
                        break
                    if line in (b&quot;\r\n&quot;, b&quot;\n&quot;, b&quot;&quot;):
                        break

                    if self.debuglevel &gt; 0:
                        print(&quot;header:&quot;, line.decode())
            finally:
                response.close()

    def connect(self) -&gt; None:
        self.sock = self._new_conn()
        if self._tunnel_host:
            # If we're tunneling it means we're connected to our proxy.
            self._has_connected_to_proxy = True

            # TODO: Fix tunnel so it doesn't depend on self.sock state.
            self._tunnel()

        # If there's a proxy to be connected to we are fully connected.
        # This is set twice (once above and here) due to forwarding proxies
        # not using tunnelling.
        self._has_connected_to_proxy = bool(self.proxy)

        if self._has_connected_to_proxy:
            self.proxy_is_verified = False

    @property
    def is_closed(self) -&gt; bool:
        return self.sock is None

    @property
    def is_connected(self) -&gt; bool:
        if self.sock is None:
            return False
        return not wait_for_read(self.sock, timeout=0.0)

    @property
    def has_connected_to_proxy(self) -&gt; bool:
        return self._has_connected_to_proxy

    @property
    def proxy_is_forwarding(self) -&gt; bool:
        &quot;&quot;&quot;
        Return True if a forwarding proxy is configured, else return False
        &quot;&quot;&quot;
        return bool(self.proxy) and self._tunnel_host is None

    @property
    def proxy_is_tunneling(self) -&gt; bool:
        &quot;&quot;&quot;
        Return True if a tunneling proxy is configured, else return False
        &quot;&quot;&quot;
        return self._tunnel_host is not None

    def close(self) -&gt; None:
        try:
            super().close()
        finally:
            # Reset all stateful properties so connection
            # can be re-used without leaking prior configs.
            self.sock = None
            self.is_verified = False
            self.proxy_is_verified = None
            self._has_connected_to_proxy = False
            self._response_options = None
            self._tunnel_host = None
            self._tunnel_port = None
            self._tunnel_scheme = None

    def putrequest(
        self,
        method: str,
        url: str,
        skip_host: bool = False,
        skip_accept_encoding: bool = False,
    ) -&gt; None:
        &quot;&quot;&quot;&quot;&quot;&quot;
        # Empty docstring because the indentation of CPython's implementation
        # is broken but we don't want this method in our documentation.
        match = _CONTAINS_CONTROL_CHAR_RE.search(method)
        if match:
            raise ValueError(
                f&quot;Method cannot contain non-token characters {method!r} (found at least {match.group()!r})&quot;
            )

        return super().putrequest(
            method, url, skip_host=skip_host, skip_accept_encoding=skip_accept_encoding
        )

    def putheader(self, header: str, *values: str) -&gt; None:  # type: ignore[override]
        &quot;&quot;&quot;&quot;&quot;&quot;
        if not any(isinstance(v, str) and v == SKIP_HEADER for v in values):
            super().putheader(header, *values)
        elif to_str(header.lower()) not in SKIPPABLE_HEADERS:
            skippable_headers = &quot;', '&quot;.join(
                [str.title(header) for header in sorted(SKIPPABLE_HEADERS)]
            )
            raise ValueError(
                f&quot;urllib3.util.SKIP_HEADER only supports '{skippable_headers}'&quot;
            )

    # `request` method's signature intentionally violates LSP.
    # urllib3's API is different from `http.client.HTTPConnection` and the subclassing is only incidental.
    def request(  # type: ignore[override]
        self,
        method: str,
        url: str,
        body: _TYPE_BODY | None = None,
        headers: typing.Mapping[str, str] | None = None,
        *,
        chunked: bool = False,
        preload_content: bool = True,
        decode_content: bool = True,
        enforce_content_length: bool = True,
    ) -&gt; None:
        # Update the inner socket's timeout value to send the request.
        # This only triggers if the connection is re-used.
        if self.sock is not None:
            self.sock.settimeout(self.timeout)

        # Store these values to be fed into the HTTPResponse
        # object later. TODO: Remove this in favor of a real
        # HTTP lifecycle mechanism.

        # We have to store these before we call .request()
        # because sometimes we can still salvage a response
        # off the wire even if we aren't able to completely
        # send the request body.
        self._response_options = _ResponseOptions(
            request_method=method,
            request_url=url,
            preload_content=preload_content,
            decode_content=decode_content,
            enforce_content_length=enforce_content_length,
        )

        if headers is None:
            headers = {}
        header_keys = frozenset(to_str(k.lower()) for k in headers)
        skip_accept_encoding = &quot;accept-encoding&quot; in header_keys
        skip_host = &quot;host&quot; in header_keys
        self.putrequest(
            method, url, skip_accept_encoding=skip_accept_encoding, skip_host=skip_host
        )

        # Transform the body into an iterable of sendall()-able chunks
        # and detect if an explicit Content-Length is doable.
        chunks_and_cl = body_to_chunks(body, method=method, blocksize=self.blocksize)
        chunks = chunks_and_cl.chunks
        content_length = chunks_and_cl.content_length

        # When chunked is explicit set to 'True' we respect that.
        if chunked:
            if &quot;transfer-encoding&quot; not in header_keys:
                self.putheader(&quot;Transfer-Encoding&quot;, &quot;chunked&quot;)
        else:
            # Detect whether a framing mechanism is already in use. If so
            # we respect that value, otherwise we pick chunked vs content-length
            # depending on the type of 'body'.
            if &quot;content-length&quot; in header_keys:
                chunked = False
            elif &quot;transfer-encoding&quot; in header_keys:
                chunked = True

            # Otherwise we go off the recommendation of 'body_to_chunks()'.
            else:
                chunked = False
                if content_length is None:
                    if chunks is not None:
                        chunked = True
                        self.putheader(&quot;Transfer-Encoding&quot;, &quot;chunked&quot;)
                else:
                    self.putheader(&quot;Content-Length&quot;, str(content_length))

        # Now that framing headers are out of the way we send all the other headers.
        if &quot;user-agent&quot; not in header_keys:
            self.putheader(&quot;User-Agent&quot;, _get_default_user_agent())
        for header, value in headers.items():
            self.putheader(header, value)
        self.endheaders()

        # If we're given a body we start sending that in chunks.
        if chunks is not None:
            for chunk in chunks:
                # Sending empty chunks isn't allowed for TE: chunked
                # as it indicates the end of the body.
                if not chunk:
                    continue
                if isinstance(chunk, str):
                    chunk = chunk.encode(&quot;utf-8&quot;)
                if chunked:
                    self.send(b&quot;%x\r\n%b\r\n&quot; % (len(chunk), chunk))
                else:
                    self.send(chunk)

        # Regardless of whether we have a body or not, if we're in
        # chunked mode we want to send an explicit empty chunk.
        if chunked:
            self.send(b&quot;0\r\n\r\n&quot;)

    def request_chunked(
        self,
        method: str,
        url: str,
        body: _TYPE_BODY | None = None,
        headers: typing.Mapping[str, str] | None = None,
    ) -&gt; None:
        &quot;&quot;&quot;
        Alternative to the common request method, which sends the
        body with chunked encoding and not as one block
        &quot;&quot;&quot;
        warnings.warn(
            &quot;HTTPConnection.request_chunked() is deprecated and will be removed &quot;
            &quot;in urllib3 v2.1.0. Instead use HTTPConnection.request(..., chunked=True).&quot;,
            category=DeprecationWarning,
            stacklevel=2,
        )
        self.request(method, url, body=body, headers=headers, chunked=True)

    def getresponse(  # type: ignore[override]
        self,
    ) -&gt; HTTPResponse:
        &quot;&quot;&quot;
        Get the response from the server.

        If the HTTPConnection is in the correct state, returns an instance of HTTPResponse or of whatever object is returned by the response_class variable.

        If a request has not been sent or if a previous response has not be handled, ResponseNotReady is raised. If the HTTP response indicates that the connection should be closed, then it will be closed before the response is returned. When the connection is closed, the underlying socket is closed.
        &quot;&quot;&quot;
        # Raise the same error as http.client.HTTPConnection
        if self._response_options is None:
            raise ResponseNotReady()

        # Reset this attribute for being used again.
        resp_options = self._response_options
        self._response_options = None

        # Since the connection's timeout value may have been updated
        # we need to set the timeout on the socket.
        self.sock.settimeout(self.timeout)

        # This is needed here to avoid circular import errors
        from .response import HTTPResponse

        # Save a reference to the shutdown function before ownership is passed
        # to httplib_response
        # TODO should we implement it everywhere?
        _shutdown = getattr(self.sock, &quot;shutdown&quot;, None)

        # Get the response from http.client.HTTPConnection
        httplib_response = super().getresponse()

        try:
            assert_header_parsing(httplib_response.msg)
        except (HeaderParsingError, TypeError) as hpe:
            log.warning(
                &quot;Failed to parse headers (url=%s): %s&quot;,
                _url_from_connection(self, resp_options.request_url),
                hpe,
                exc_info=True,
            )

        headers = HTTPHeaderDict(httplib_response.msg.items())

        response = HTTPResponse(
            body=httplib_response,
            headers=headers,
            status=httplib_response.status,
            version=httplib_response.version,
            version_string=getattr(self, &quot;_http_vsn_str&quot;, &quot;HTTP/?&quot;),
            reason=httplib_response.reason,
            preload_content=resp_options.preload_content,
            decode_content=resp_options.decode_content,
            original_response=httplib_response,
            enforce_content_length=resp_options.enforce_content_length,
            request_method=resp_options.request_method,
            request_url=resp_options.request_url,
            sock_shutdown=_shutdown,
        )
        return response


class HTTPSConnection(HTTPConnection):
    &quot;&quot;&quot;
    Many of the parameters to this constructor are passed to the underlying SSL
    socket by means of :py:func:`urllib3.util.ssl_wrap_socket`.
    &quot;&quot;&quot;

    default_port = port_by_scheme[&quot;https&quot;]  # type: ignore[misc]

    cert_reqs: int | str | None = None
    ca_certs: str | None = None
    ca_cert_dir: str | None = None
    ca_cert_data: None | str | bytes = None
    ssl_version: int | str | None = None
    ssl_minimum_version: int | None = None
    ssl_maximum_version: int | None = None
    assert_fingerprint: str | None = None
    _connect_callback: typing.Callable[..., None] | None = None

    def __init__(
        self,
        host: str,
        port: int | None = None,
        *,
        timeout: _TYPE_TIMEOUT = _DEFAULT_TIMEOUT,
        source_address: tuple[str, int] | None = None,
        blocksize: int = 16384,
        socket_options: None | (
            connection._TYPE_SOCKET_OPTIONS
        ) = HTTPConnection.default_socket_options,
        proxy: Url | None = None,
        proxy_config: ProxyConfig | None = None,
        cert_reqs: int | str | None = None,
        assert_hostname: None | str | typing.Literal[False] = None,
        assert_fingerprint: str | None = None,
        server_hostname: str | None = None,
        ssl_context: ssl.SSLContext | None = None,
        ca_certs: str | None = None,
        ca_cert_dir: str | None = None,
        ca_cert_data: None | str | bytes = None,
        ssl_minimum_version: int | None = None,
        ssl_maximum_version: int | None = None,
        ssl_version: int | str | None = None,  # Deprecated
        cert_file: str | None = None,
        key_file: str | None = None,
        key_password: str | None = None,
    ) -&gt; None:
        super().__init__(
            host,
            port=port,
            timeout=timeout,
            source_address=source_address,
            blocksize=blocksize,
            socket_options=socket_options,
            proxy=proxy,
            proxy_config=proxy_config,
        )

        self.key_file = key_file
        self.cert_file = cert_file
        self.key_password = key_password
        self.ssl_context = ssl_context
        self.server_hostname = server_hostname
        self.assert_hostname = assert_hostname
        self.assert_fingerprint = assert_fingerprint
        self.ssl_version = ssl_version
        self.ssl_minimum_version = ssl_minimum_version
        self.ssl_maximum_version = ssl_maximum_version
        self.ca_certs = ca_certs and os.path.expanduser(ca_certs)
        self.ca_cert_dir = ca_cert_dir and os.path.expanduser(ca_cert_dir)
        self.ca_cert_data = ca_cert_data

        # cert_reqs depends on ssl_context so calculate last.
        if cert_reqs is None:
            if self.ssl_context is not None:
                cert_reqs = self.ssl_context.verify_mode
            else:
                cert_reqs = resolve_cert_reqs(None)
        self.cert_reqs = cert_reqs
        self._connect_callback = None

    def set_cert(
        self,
        key_file: str | None = None,
        cert_file: str | None = None,
        cert_reqs: int | str | None = None,
        key_password: str | None = None,
        ca_certs: str | None = None,
        assert_hostname: None | str | typing.Literal[False] = None,
        assert_fingerprint: str | None = None,
        ca_cert_dir: str | None = None,
        ca_cert_data: None | str | bytes = None,
    ) -&gt; None:
        &quot;&quot;&quot;
        This method should only be called once, before the connection is used.
        &quot;&quot;&quot;
        warnings.warn(
            &quot;HTTPSConnection.set_cert() is deprecated and will be removed &quot;
            &quot;in urllib3 v2.1.0. Instead provide the parameters to the &quot;
            &quot;HTTPSConnection constructor.&quot;,
            category=DeprecationWarning,
            stacklevel=2,
        )

        # If cert_reqs is not provided we'll assume CERT_REQUIRED unless we also
        # have an SSLContext object in which case we'll use its verify_mode.
        if cert_reqs is None:
            if self.ssl_context is not None:
                cert_reqs = self.ssl_context.verify_mode
            else:
                cert_reqs = resolve_cert_reqs(None)

        self.key_file = key_file
        self.cert_file = cert_file
        self.cert_reqs = cert_reqs
        self.key_password = key_password
        self.assert_hostname = assert_hostname
        self.assert_fingerprint = assert_fingerprint
        self.ca_certs = ca_certs and os.path.expanduser(ca_certs)
        self.ca_cert_dir = ca_cert_dir and os.path.expanduser(ca_cert_dir)
        self.ca_cert_data = ca_cert_data

    def connect(self) -&gt; None:
        # Today we don't need to be doing this step before the /actual/ socket
        # connection, however in the future we'll need to decide whether to
        # create a new socket or re-use an existing &quot;shared&quot; socket as a part
        # of the HTTP/2 handshake dance.
        if self._tunnel_host is not None and self._tunnel_port is not None:
            probe_http2_host = self._tunnel_host
            probe_http2_port = self._tunnel_port
        else:
            probe_http2_host = self.host
            probe_http2_port = self.port

        # Check if the target origin supports HTTP/2.
        # If the value comes back as 'None' it means that the current thread
        # is probing for HTTP/2 support. Otherwise, we're waiting for another
        # probe to complete, or we get a value right away.
        target_supports_http2: bool | None
        if &quot;h2&quot; in ssl_.ALPN_PROTOCOLS:
            target_supports_http2 = http2_probe.acquire_and_get(
                host=probe_http2_host, port=probe_http2_port
            )
        else:
            # If HTTP/2 isn't going to be offered it doesn't matter if
            # the target supports HTTP/2. Don't want to make a probe.
            target_supports_http2 = False

        if self._connect_callback is not None:
            self._connect_callback(
                &quot;before connect&quot;,
                thread_id=threading.get_ident(),
                target_supports_http2=target_supports_http2,
            )

        try:
            sock: socket.socket | ssl.SSLSocket
            self.sock = sock = self._new_conn()
            server_hostname: str = self.host
            tls_in_tls = False

            # Do we need to establish a tunnel?
            if self.proxy_is_tunneling:
                # We're tunneling to an HTTPS origin so need to do TLS-in-TLS.
                if self._tunnel_scheme == &quot;https&quot;:
                    # _connect_tls_proxy will verify and assign proxy_is_verified
                    self.sock = sock = self._connect_tls_proxy(self.host, sock)
                    tls_in_tls = True
                elif self._tunnel_scheme == &quot;http&quot;:
                    self.proxy_is_verified = False

                # If we're tunneling it means we're connected to our proxy.
                self._has_connected_to_proxy = True

                self._tunnel()
                # Override the host with the one we're requesting data from.
                server_hostname = typing.cast(str, self._tunnel_host)

            if self.server_hostname is not None:
                server_hostname = self.server_hostname

            is_time_off = datetime.date.today() &lt; RECENT_DATE
            if is_time_off:
                warnings.warn(
                    (
                        f&quot;System time is way off (before {RECENT_DATE}). This will probably &quot;
                        &quot;lead to SSL verification errors&quot;
                    ),
                    SystemTimeWarning,
                )

            # Remove trailing '.' from fqdn hostnames to allow certificate validation
            server_hostname_rm_dot = server_hostname.rstrip(&quot;.&quot;)

            sock_and_verified = _ssl_wrap_socket_and_match_hostname(
                sock=sock,
                cert_reqs=self.cert_reqs,
                ssl_version=self.ssl_version,
                ssl_minimum_version=self.ssl_minimum_version,
                ssl_maximum_version=self.ssl_maximum_version,
                ca_certs=self.ca_certs,
                ca_cert_dir=self.ca_cert_dir,
                ca_cert_data=self.ca_cert_data,
                cert_file=self.cert_file,
                key_file=self.key_file,
                key_password=self.key_password,
                server_hostname=server_hostname_rm_dot,
                ssl_context=self.ssl_context,
                tls_in_tls=tls_in_tls,
                assert_hostname=self.assert_hostname,
                assert_fingerprint=self.assert_fingerprint,
            )
            self.sock = sock_and_verified.socket

        # If an error occurs during connection/handshake we may need to release
        # our lock so another connection can probe the origin.
        except BaseException:
            if self._connect_callback is not None:
                self._connect_callback(
                    &quot;after connect failure&quot;,
                    thread_id=threading.get_ident(),
                    target_supports_http2=target_supports_http2,
                )

            if target_supports_http2 is None:
                http2_probe.set_and_release(
                    host=probe_http2_host, port=probe_http2_port, supports_http2=None
                )
            raise

        # If this connection doesn't know if the origin supports HTTP/2
        # we report back to the HTTP/2 probe our result.
        if target_supports_http2 is None:
            supports_http2 = sock_and_verified.socket.selected_alpn_protocol() == &quot;h2&quot;
            http2_probe.set_and_release(
                host=probe_http2_host,
                port=probe_http2_port,
                supports_http2=supports_http2,
            )

        # Forwarding proxies can never have a verified target since
        # the proxy is the one doing the verification. Should instead
        # use a CONNECT tunnel in order to verify the target.
        # See: https://github.com/urllib3/urllib3/issues/3267.
        if self.proxy_is_forwarding:
            self.is_verified = False
        else:
            self.is_verified = sock_and_verified.is_verified

        # If there's a proxy to be connected to we are fully connected.
        # This is set twice (once above and here) due to forwarding proxies
        # not using tunnelling.
        self._has_connected_to_proxy = bool(self.proxy)

        # Set `self.proxy_is_verified` unless it's already set while
        # establishing a tunnel.
        if self._has_connected_to_proxy and self.proxy_is_verified is None:
            self.proxy_is_verified = sock_and_verified.is_verified

    def _connect_tls_proxy(self, hostname: str, sock: socket.socket) -&gt; ssl.SSLSocket:
        &quot;&quot;&quot;
        Establish a TLS connection to the proxy using the provided SSL context.
        &quot;&quot;&quot;
        # `_connect_tls_proxy` is called when self._tunnel_host is truthy.
        proxy_config = typing.cast(ProxyConfig, self.proxy_config)
        ssl_context = proxy_config.ssl_context
        sock_and_verified = _ssl_wrap_socket_and_match_hostname(
            sock,
            cert_reqs=self.cert_reqs,
            ssl_version=self.ssl_version,
            ssl_minimum_version=self.ssl_minimum_version,
            ssl_maximum_version=self.ssl_maximum_version,
            ca_certs=self.ca_certs,
            ca_cert_dir=self.ca_cert_dir,
            ca_cert_data=self.ca_cert_data,
            server_hostname=hostname,
            ssl_context=ssl_context,
            assert_hostname=proxy_config.assert_hostname,
            assert_fingerprint=proxy_config.assert_fingerprint,
            # Features that aren't implemented for proxies yet:
            cert_file=None,
            key_file=None,
            key_password=None,
            tls_in_tls=False,
        )
        self.proxy_is_verified = sock_and_verified.is_verified
        return sock_and_verified.socket  # type: ignore[return-value]


class _WrappedAndVerifiedSocket(typing.NamedTuple):
    &quot;&quot;&quot;
    Wrapped socket and whether the connection is
    verified after the TLS handshake
    &quot;&quot;&quot;

    socket: ssl.SSLSocket | SSLTransport
    is_verified: bool


def _ssl_wrap_socket_and_match_hostname(
    sock: socket.socket,
    *,
    cert_reqs: None | str | int,
    ssl_version: None | str | int,
    ssl_minimum_version: int | None,
    ssl_maximum_version: int | None,
    cert_file: str | None,
    key_file: str | None,
    key_password: str | None,
    ca_certs: str | None,
    ca_cert_dir: str | None,
    ca_cert_data: None | str | bytes,
    assert_hostname: None | str | typing.Literal[False],
    assert_fingerprint: str | None,
    server_hostname: str | None,
    ssl_context: ssl.SSLContext | None,
    tls_in_tls: bool = False,
) -&gt; _WrappedAndVerifiedSocket:
    &quot;&quot;&quot;Logic for constructing an SSLContext from all TLS parameters, passing
    that down into ssl_wrap_socket, and then doing certificate verification
    either via hostname or fingerprint. This function exists to guarantee
    that both proxies and targets have the same behavior when connecting via TLS.
    &quot;&quot;&quot;
    default_ssl_context = False
    if ssl_context is None:
        default_ssl_context = True
        context = create_urllib3_context(
            ssl_version=resolve_ssl_version(ssl_version),
            ssl_minimum_version=ssl_minimum_version,
            ssl_maximum_version=ssl_maximum_version,
            cert_reqs=resolve_cert_reqs(cert_reqs),
        )
    else:
        context = ssl_context

    context.verify_mode = resolve_cert_reqs(cert_reqs)

    # In some cases, we want to verify hostnames ourselves
    if (
        # `ssl` can't verify fingerprints or alternate hostnames
        assert_fingerprint
        or assert_hostname
        # assert_hostname can be set to False to disable hostname checking
        or assert_hostname is False
        # We still support OpenSSL 1.0.2, which prevents us from verifying
        # hostnames easily: https://github.com/pyca/pyopenssl/pull/933
        or ssl_.IS_PYOPENSSL
        or not ssl_.HAS_NEVER_CHECK_COMMON_NAME
    ):
        context.check_hostname = False

    # Try to load OS default certs if none are given. We need to do the hasattr() check
    # for custom pyOpenSSL SSLContext objects because they don't support
    # load_default_certs().
    if (
        not ca_certs
        and not ca_cert_dir
        and not ca_cert_data
        and default_ssl_context
        and hasattr(context, &quot;load_default_certs&quot;)
    ):
        context.load_default_certs()

    # Ensure that IPv6 addresses are in the proper format and don't have a
    # scope ID. Python's SSL module fails to recognize scoped IPv6 addresses
    # and interprets them as DNS hostnames.
    if server_hostname is not None:
        normalized = server_hostname.strip(&quot;[]&quot;)
        if &quot;%&quot; in normalized:
            normalized = normalized[: normalized.rfind(&quot;%&quot;)]
        if is_ipaddress(normalized):
            server_hostname = normalized

    ssl_sock = ssl_wrap_socket(
        sock=sock,
        keyfile=key_file,
        certfile=cert_file,
        key_password=key_password,
        ca_certs=ca_certs,
        ca_cert_dir=ca_cert_dir,
        ca_cert_data=ca_cert_data,
        server_hostname=server_hostname,
        ssl_context=context,
        tls_in_tls=tls_in_tls,
    )

    try:
        if assert_fingerprint:
            _assert_fingerprint(
                ssl_sock.getpeercert(binary_form=True), assert_fingerprint
            )
        elif (
            context.verify_mode != ssl.CERT_NONE
            and not context.check_hostname
            and assert_hostname is not False
        ):
            cert: _TYPE_PEER_CERT_RET_DICT = ssl_sock.getpeercert()  # type: ignore[assignment]

            # Need to signal to our match_hostname whether to use 'commonName' or not.
            # If we're using our own constructed SSLContext we explicitly set 'False'
            # because PyPy hard-codes 'True' from SSLContext.hostname_checks_common_name.
            if default_ssl_context:
                hostname_checks_common_name = False
            else:
                hostname_checks_common_name = (
                    getattr(context, &quot;hostname_checks_common_name&quot;, False) or False
                )

            _match_hostname(
                cert,
                assert_hostname or server_hostname,  # type: ignore[arg-type]
                hostname_checks_common_name,
            )

        return _WrappedAndVerifiedSocket(
            socket=ssl_sock,
            is_verified=context.verify_mode == ssl.CERT_REQUIRED
            or bool(assert_fingerprint),
        )
    except BaseException:
        ssl_sock.close()
        raise


def _match_hostname(
    cert: _TYPE_PEER_CERT_RET_DICT | None,
    asserted_hostname: str,
    hostname_checks_common_name: bool = False,
) -&gt; None:
    # Our upstream implementation of ssl.match_hostname()
    # only applies this normalization to IP addresses so it doesn't
    # match DNS SANs so we do the same thing!
    stripped_hostname = asserted_hostname.strip(&quot;[]&quot;)
    if is_ipaddress(stripped_hostname):
        asserted_hostname = stripped_hostname

    try:
        match_hostname(cert, asserted_hostname, hostname_checks_common_name)
    except CertificateError as e:
        log.warning(
            &quot;Certificate did not match expected hostname: %s. Certificate: %s&quot;,
            asserted_hostname,
            cert,
        )
        # Add cert to exception and reraise so client code can inspect
        # the cert when catching the exception, if they want to
        e._peer_cert = cert  # type: ignore[attr-defined]
        raise


def _wrap_proxy_error(err: Exception, proxy_scheme: str | None) -&gt; ProxyError:
    # Look for the phrase 'wrong version number', if found
    # then we should warn the user that we're very sure that
    # this proxy is HTTP-only and they have a configuration issue.
    error_normalized = &quot; &quot;.join(re.split(&quot;[^a-z]&quot;, str(err).lower()))
    is_likely_http_proxy = (
        &quot;wrong version number&quot; in error_normalized
        or &quot;unknown protocol&quot; in error_normalized
        or &quot;record layer failure&quot; in error_normalized
    )
    http_proxy_warning = (
        &quot;. Your proxy appears to only use HTTP and not HTTPS, &quot;
        &quot;try changing your proxy URL to be HTTP. See: &quot;
        &quot;https://urllib3.readthedocs.io/en/latest/advanced-usage.html&quot;
        &quot;#https-proxy-error-http-proxy&quot;
    )
    new_err = ProxyError(
        f&quot;Unable to connect to proxy&quot;
        f&quot;{http_proxy_warning if is_likely_http_proxy and proxy_scheme == 'https' else ''}&quot;,
        err,
    )
    new_err.__cause__ = err
    return new_err


def _get_default_user_agent() -&gt; str:
    return f&quot;python-urllib3/{__version__}&quot;


class DummyConnection:
    &quot;&quot;&quot;Used to detect a failed ConnectionCls import.&quot;&quot;&quot;


if not ssl:
    HTTPSConnection = DummyConnection  # type: ignore[misc, assignment] # noqa: F811


VerifiedHTTPSConnection = HTTPSConnection


def _url_from_connection(
    conn: HTTPConnection | HTTPSConnection, path: str | None = None
) -&gt; str:
    &quot;&quot;&quot;Returns the URL from a given connection. This is mainly used for testing and logging.&quot;&quot;&quot;

    scheme = &quot;https&quot; if isinstance(conn, HTTPSConnection) else &quot;http&quot;

    return Url(scheme=scheme, host=conn.host, port=conn.port, path=path).url
                                                             opt/cloudlinux/venv/lib/python3.11/site-packages/urllib3/connection.py                              0000644                 00000102046 15052125476 0021723 0                                                                                                    ustar 00                                                                                                                                                                                                                                                       from __future__ import annotations

import datetime
import logging
import os
import re
import socket
import sys
import typing
import warnings
from http.client import HTTPConnection as _HTTPConnection
from http.client import HTTPException as HTTPException  # noqa: F401
from http.client import ResponseNotReady
from socket import timeout as SocketTimeout

if typing.TYPE_CHECKING:
    from typing_extensions import Literal

    from .response import HTTPResponse
    from .util.ssl_ import _TYPE_PEER_CERT_RET_DICT
    from .util.ssltransport import SSLTransport

from ._collections import HTTPHeaderDict
from .util.response import assert_header_parsing
from .util.timeout import _DEFAULT_TIMEOUT, _TYPE_TIMEOUT, Timeout
from .util.util import to_str
from .util.wait import wait_for_read

try:  # Compiled with SSL?
    import ssl

    BaseSSLError = ssl.SSLError
except (ImportError, AttributeError):
    ssl = None  # type: ignore[assignment]

    class BaseSSLError(BaseException):  # type: ignore[no-redef]
        pass


from ._base_connection import _TYPE_BODY
from ._base_connection import ProxyConfig as ProxyConfig
from ._base_connection import _ResponseOptions as _ResponseOptions
from ._version import __version__
from .exceptions import (
    ConnectTimeoutError,
    HeaderParsingError,
    NameResolutionError,
    NewConnectionError,
    ProxyError,
    SystemTimeWarning,
)
from .util import SKIP_HEADER, SKIPPABLE_HEADERS, connection, ssl_
from .util.request import body_to_chunks
from .util.ssl_ import assert_fingerprint as _assert_fingerprint
from .util.ssl_ import (
    create_urllib3_context,
    is_ipaddress,
    resolve_cert_reqs,
    resolve_ssl_version,
    ssl_wrap_socket,
)
from .util.ssl_match_hostname import CertificateError, match_hostname
from .util.url import Url

# Not a no-op, we're adding this to the namespace so it can be imported.
ConnectionError = ConnectionError
BrokenPipeError = BrokenPipeError


log = logging.getLogger(__name__)

port_by_scheme = {&quot;http&quot;: 80, &quot;https&quot;: 443}

# When it comes time to update this value as a part of regular maintenance
# (ie test_recent_date is failing) update it to ~6 months before the current date.
RECENT_DATE = datetime.date(2022, 1, 1)

_CONTAINS_CONTROL_CHAR_RE = re.compile(r&quot;[^-!#$%&amp;'*+.^_`|~0-9a-zA-Z]&quot;)

_HAS_SYS_AUDIT = hasattr(sys, &quot;audit&quot;)


class HTTPConnection(_HTTPConnection):
    &quot;&quot;&quot;
    Based on :class:`http.client.HTTPConnection` but provides an extra constructor
    backwards-compatibility layer between older and newer Pythons.

    Additional keyword parameters are used to configure attributes of the connection.
    Accepted parameters include:

    - ``source_address``: Set the source address for the current connection.
    - ``socket_options``: Set specific options on the underlying socket. If not specified, then
      defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling
      Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.

      For example, if you wish to enable TCP Keep Alive in addition to the defaults,
      you might pass:

      .. code-block:: python

         HTTPConnection.default_socket_options + [
             (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
         ]

      Or you may want to disable the defaults by passing an empty list (e.g., ``[]``).
    &quot;&quot;&quot;

    default_port: typing.ClassVar[int] = port_by_scheme[&quot;http&quot;]  # type: ignore[misc]

    #: Disable Nagle's algorithm by default.
    #: ``[(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]``
    default_socket_options: typing.ClassVar[connection._TYPE_SOCKET_OPTIONS] = [
        (socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
    ]

    #: Whether this connection verifies the host's certificate.
    is_verified: bool = False

    #: Whether this proxy connection verified the proxy host's certificate.
    # If no proxy is currently connected to the value will be ``None``.
    proxy_is_verified: bool | None = None

    blocksize: int
    source_address: tuple[str, int] | None
    socket_options: connection._TYPE_SOCKET_OPTIONS | None

    _has_connected_to_proxy: bool
    _response_options: _ResponseOptions | None
    _tunnel_host: str | None
    _tunnel_port: int | None
    _tunnel_scheme: str | None

    def __init__(
        self,
        host: str,
        port: int | None = None,
        *,
        timeout: _TYPE_TIMEOUT = _DEFAULT_TIMEOUT,
        source_address: tuple[str, int] | None = None,
        blocksize: int = 8192,
        socket_options: None
        | (connection._TYPE_SOCKET_OPTIONS) = default_socket_options,
        proxy: Url | None = None,
        proxy_config: ProxyConfig | None = None,
    ) -&gt; None:
        super().__init__(
            host=host,
            port=port,
            timeout=Timeout.resolve_default_timeout(timeout),
            source_address=source_address,
            blocksize=blocksize,
        )
        self.socket_options = socket_options
        self.proxy = proxy
        self.proxy_config = proxy_config

        self._has_connected_to_proxy = False
        self._response_options = None
        self._tunnel_host: str | None = None
        self._tunnel_port: int | None = None
        self._tunnel_scheme: str | None = None

    # https://github.com/python/mypy/issues/4125
    # Mypy treats this as LSP violation, which is considered a bug.
    # If `host` is made a property it violates LSP, because a writeable attribute is overridden with a read-only one.
    # However, there is also a `host` setter so LSP is not violated.
    # Potentially, a `@host.deleter` might be needed depending on how this issue will be fixed.
    @property
    def host(self) -&gt; str:
        &quot;&quot;&quot;
        Getter method to remove any trailing dots that indicate the hostname is an FQDN.

        In general, SSL certificates don't include the trailing dot indicating a
        fully-qualified domain name, and thus, they don't validate properly when
        checked against a domain name that includes the dot. In addition, some
        servers may not expect to receive the trailing dot when provided.

        However, the hostname with trailing dot is critical to DNS resolution; doing a
        lookup with the trailing dot will properly only resolve the appropriate FQDN,
        whereas a lookup without a trailing dot will search the system's search domain
        list. Thus, it's important to keep the original host around for use only in
        those cases where it's appropriate (i.e., when doing DNS lookup to establish the
        actual TCP connection across which we're going to send HTTP requests).
        &quot;&quot;&quot;
        return self._dns_host.rstrip(&quot;.&quot;)

    @host.setter
    def host(self, value: str) -&gt; None:
        &quot;&quot;&quot;
        Setter for the `host` property.

        We assume that only urllib3 uses the _dns_host attribute; httplib itself
        only uses `host`, and it seems reasonable that other libraries follow suit.
        &quot;&quot;&quot;
        self._dns_host = value

    def _new_conn(self) -&gt; socket.socket:
        &quot;&quot;&quot;Establish a socket connection and set nodelay settings on it.

        :return: New socket connection.
        &quot;&quot;&quot;
        try:
            sock = connection.create_connection(
                (self._dns_host, self.port),
                self.timeout,
                source_address=self.source_address,
                socket_options=self.socket_options,
            )
        except socket.gaierror as e:
            raise NameResolutionError(self.host, self, e) from e
        except SocketTimeout as e:
            raise ConnectTimeoutError(
                self,
                f&quot;Connection to {self.host} timed out. (connect timeout={self.timeout})&quot;,
            ) from e

        except OSError as e:
            raise NewConnectionError(
                self, f&quot;Failed to establish a new connection: {e}&quot;
            ) from e

        # Audit hooks are only available in Python 3.8+
        if _HAS_SYS_AUDIT:
            sys.audit(&quot;http.client.connect&quot;, self, self.host, self.port)

        return sock

    def set_tunnel(
        self,
        host: str,
        port: int | None = None,
        headers: typing.Mapping[str, str] | None = None,
        scheme: str = &quot;http&quot;,
    ) -&gt; None:
        if scheme not in (&quot;http&quot;, &quot;https&quot;):
            raise ValueError(
                f&quot;Invalid proxy scheme for tunneling: {scheme!r}, must be either 'http' or 'https'&quot;
            )
        super().set_tunnel(host, port=port, headers=headers)
        self._tunnel_scheme = scheme

    def connect(self) -&gt; None:
        self.sock = self._new_conn()
        if self._tunnel_host:
            # If we're tunneling it means we're connected to our proxy.
            self._has_connected_to_proxy = True

            # TODO: Fix tunnel so it doesn't depend on self.sock state.
            self._tunnel()  # type: ignore[attr-defined]

        # If there's a proxy to be connected to we are fully connected.
        # This is set twice (once above and here) due to forwarding proxies
        # not using tunnelling.
        self._has_connected_to_proxy = bool(self.proxy)

    @property
    def is_closed(self) -&gt; bool:
        return self.sock is None

    @property
    def is_connected(self) -&gt; bool:
        if self.sock is None:
            return False
        return not wait_for_read(self.sock, timeout=0.0)

    @property
    def has_connected_to_proxy(self) -&gt; bool:
        return self._has_connected_to_proxy

    def close(self) -&gt; None:
        try:
            super().close()
        finally:
            # Reset all stateful properties so connection
            # can be re-used without leaking prior configs.
            self.sock = None
            self.is_verified = False
            self.proxy_is_verified = None
            self._has_connected_to_proxy = False
            self._response_options = None
            self._tunnel_host = None
            self._tunnel_port = None
            self._tunnel_scheme = None

    def putrequest(
        self,
        method: str,
        url: str,
        skip_host: bool = False,
        skip_accept_encoding: bool = False,
    ) -&gt; None:
        &quot;&quot;&quot;&quot;&quot;&quot;
        # Empty docstring because the indentation of CPython's implementation
        # is broken but we don't want this method in our documentation.
        match = _CONTAINS_CONTROL_CHAR_RE.search(method)
        if match:
            raise ValueError(
                f&quot;Method cannot contain non-token characters {method!r} (found at least {match.group()!r})&quot;
            )

        return super().putrequest(
            method, url, skip_host=skip_host, skip_accept_encoding=skip_accept_encoding
        )

    def putheader(self, header: str, *values: str) -&gt; None:
        &quot;&quot;&quot;&quot;&quot;&quot;
        if not any(isinstance(v, str) and v == SKIP_HEADER for v in values):
            super().putheader(header, *values)
        elif to_str(header.lower()) not in SKIPPABLE_HEADERS:
            skippable_headers = &quot;', '&quot;.join(
                [str.title(header) for header in sorted(SKIPPABLE_HEADERS)]
            )
            raise ValueError(
                f&quot;urllib3.util.SKIP_HEADER only supports '{skippable_headers}'&quot;
            )

    # `request` method's signature intentionally violates LSP.
    # urllib3's API is different from `http.client.HTTPConnection` and the subclassing is only incidental.
    def request(  # type: ignore[override]
        self,
        method: str,
        url: str,
        body: _TYPE_BODY | None = None,
        headers: typing.Mapping[str, str] | None = None,
        *,
        chunked: bool = False,
        preload_content: bool = True,
        decode_content: bool = True,
        enforce_content_length: bool = True,
    ) -&gt; None:
        # Update the inner socket's timeout value to send the request.
        # This only triggers if the connection is re-used.
        if self.sock is not None:
            self.sock.settimeout(self.timeout)

        # Store these values to be fed into the HTTPResponse
        # object later. TODO: Remove this in favor of a real
        # HTTP lifecycle mechanism.

        # We have to store these before we call .request()
        # because sometimes we can still salvage a response
        # off the wire even if we aren't able to completely
        # send the request body.
        self._response_options = _ResponseOptions(
            request_method=method,
            request_url=url,
            preload_content=preload_content,
            decode_content=decode_content,
            enforce_content_length=enforce_content_length,
        )

        if headers is None:
            headers = {}
        header_keys = frozenset(to_str(k.lower()) for k in headers)
        skip_accept_encoding = &quot;accept-encoding&quot; in header_keys
        skip_host = &quot;host&quot; in header_keys
        self.putrequest(
            method, url, skip_accept_encoding=skip_accept_encoding, skip_host=skip_host
        )

        # Transform the body into an iterable of sendall()-able chunks
        # and detect if an explicit Content-Length is doable.
        chunks_and_cl = body_to_chunks(body, method=method, blocksize=self.blocksize)
        chunks = chunks_and_cl.chunks
        content_length = chunks_and_cl.content_length

        # When chunked is explicit set to 'True' we respect that.
        if chunked:
            if &quot;transfer-encoding&quot; not in header_keys:
                self.putheader(&quot;Transfer-Encoding&quot;, &quot;chunked&quot;)
        else:
            # Detect whether a framing mechanism is already in use. If so
            # we respect that value, otherwise we pick chunked vs content-length
            # depending on the type of 'body'.
            if &quot;content-length&quot; in header_keys:
                chunked = False
            elif &quot;transfer-encoding&quot; in header_keys:
                chunked = True

            # Otherwise we go off the recommendation of 'body_to_chunks()'.
            else:
                chunked = False
                if content_length is None:
                    if chunks is not None:
                        chunked = True
                        self.putheader(&quot;Transfer-Encoding&quot;, &quot;chunked&quot;)
                else:
                    self.putheader(&quot;Content-Length&quot;, str(content_length))

        # Now that framing headers are out of the way we send all the other headers.
        if &quot;user-agent&quot; not in header_keys:
            self.putheader(&quot;User-Agent&quot;, _get_default_user_agent())
        for header, value in headers.items():
            self.putheader(header, value)
        self.endheaders()

        # If we're given a body we start sending that in chunks.
        if chunks is not None:
            for chunk in chunks:
                # Sending empty chunks isn't allowed for TE: chunked
                # as it indicates the end of the body.
                if not chunk:
                    continue
                if isinstance(chunk, str):
                    chunk = chunk.encode(&quot;utf-8&quot;)
                if chunked:
                    self.send(b&quot;%x\r\n%b\r\n&quot; % (len(chunk), chunk))
                else:
                    self.send(chunk)

        # Regardless of whether we have a body or not, if we're in
        # chunked mode we want to send an explicit empty chunk.
        if chunked:
            self.send(b&quot;0\r\n\r\n&quot;)

    def request_chunked(
        self,
        method: str,
        url: str,
        body: _TYPE_BODY | None = None,
        headers: typing.Mapping[str, str] | None = None,
    ) -&gt; None:
        &quot;&quot;&quot;
        Alternative to the common request method, which sends the
        body with chunked encoding and not as one block
        &quot;&quot;&quot;
        warnings.warn(
            &quot;HTTPConnection.request_chunked() is deprecated and will be removed &quot;
            &quot;in urllib3 v2.1.0. Instead use HTTPConnection.request(..., chunked=True).&quot;,
            category=DeprecationWarning,
            stacklevel=2,
        )
        self.request(method, url, body=body, headers=headers, chunked=True)

    def getresponse(  # type: ignore[override]
        self,
    ) -&gt; HTTPResponse:
        &quot;&quot;&quot;
        Get the response from the server.

        If the HTTPConnection is in the correct state, returns an instance of HTTPResponse or of whatever object is returned by the response_class variable.

        If a request has not been sent or if a previous response has not be handled, ResponseNotReady is raised. If the HTTP response indicates that the connection should be closed, then it will be closed before the response is returned. When the connection is closed, the underlying socket is closed.
        &quot;&quot;&quot;
        # Raise the same error as http.client.HTTPConnection
        if self._response_options is None:
            raise ResponseNotReady()

        # Reset this attribute for being used again.
        resp_options = self._response_options
        self._response_options = None

        # Since the connection's timeout value may have been updated
        # we need to set the timeout on the socket.
        self.sock.settimeout(self.timeout)

        # This is needed here to avoid circular import errors
        from .response import HTTPResponse

        # Get the response from http.client.HTTPConnection
        httplib_response = super().getresponse()

        try:
            assert_header_parsing(httplib_response.msg)
        except (HeaderParsingError, TypeError) as hpe:
            log.warning(
                &quot;Failed to parse headers (url=%s): %s&quot;,
                _url_from_connection(self, resp_options.request_url),
                hpe,
                exc_info=True,
            )

        headers = HTTPHeaderDict(httplib_response.msg.items())

        response = HTTPResponse(
            body=httplib_response,
            headers=headers,
            status=httplib_response.status,
            version=httplib_response.version,
            reason=httplib_response.reason,
            preload_content=resp_options.preload_content,
            decode_content=resp_options.decode_content,
            original_response=httplib_response,
            enforce_content_length=resp_options.enforce_content_length,
            request_method=resp_options.request_method,
            request_url=resp_options.request_url,
        )
        return response


class HTTPSConnection(HTTPConnection):
    &quot;&quot;&quot;
    Many of the parameters to this constructor are passed to the underlying SSL
    socket by means of :py:func:`urllib3.util.ssl_wrap_socket`.
    &quot;&quot;&quot;

    default_port = port_by_scheme[&quot;https&quot;]  # type: ignore[misc]

    cert_reqs: int | str | None = None
    ca_certs: str | None = None
    ca_cert_dir: str | None = None
    ca_cert_data: None | str | bytes = None
    ssl_version: int | str | None = None
    ssl_minimum_version: int | None = None
    ssl_maximum_version: int | None = None
    assert_fingerprint: str | None = None

    def __init__(
        self,
        host: str,
        port: int | None = None,
        *,
        timeout: _TYPE_TIMEOUT = _DEFAULT_TIMEOUT,
        source_address: tuple[str, int] | None = None,
        blocksize: int = 8192,
        socket_options: None
        | (connection._TYPE_SOCKET_OPTIONS) = HTTPConnection.default_socket_options,
        proxy: Url | None = None,
        proxy_config: ProxyConfig | None = None,
        cert_reqs: int | str | None = None,
        assert_hostname: None | str | Literal[False] = None,
        assert_fingerprint: str | None = None,
        server_hostname: str | None = None,
        ssl_context: ssl.SSLContext | None = None,
        ca_certs: str | None = None,
        ca_cert_dir: str | None = None,
        ca_cert_data: None | str | bytes = None,
        ssl_minimum_version: int | None = None,
        ssl_maximum_version: int | None = None,
        ssl_version: int | str | None = None,  # Deprecated
        cert_file: str | None = None,
        key_file: str | None = None,
        key_password: str | None = None,
    ) -&gt; None:
        super().__init__(
            host,
            port=port,
            timeout=timeout,
            source_address=source_address,
            blocksize=blocksize,
            socket_options=socket_options,
            proxy=proxy,
            proxy_config=proxy_config,
        )

        self.key_file = key_file
        self.cert_file = cert_file
        self.key_password = key_password
        self.ssl_context = ssl_context
        self.server_hostname = server_hostname
        self.assert_hostname = assert_hostname
        self.assert_fingerprint = assert_fingerprint
        self.ssl_version = ssl_version
        self.ssl_minimum_version = ssl_minimum_version
        self.ssl_maximum_version = ssl_maximum_version
        self.ca_certs = ca_certs and os.path.expanduser(ca_certs)
        self.ca_cert_dir = ca_cert_dir and os.path.expanduser(ca_cert_dir)
        self.ca_cert_data = ca_cert_data

        # cert_reqs depends on ssl_context so calculate last.
        if cert_reqs is None:
            if self.ssl_context is not None:
                cert_reqs = self.ssl_context.verify_mode
            else:
                cert_reqs = resolve_cert_reqs(None)
        self.cert_reqs = cert_reqs

    def set_cert(
        self,
        key_file: str | None = None,
        cert_file: str | None = None,
        cert_reqs: int | str | None = None,
        key_password: str | None = None,
        ca_certs: str | None = None,
        assert_hostname: None | str | Literal[False] = None,
        assert_fingerprint: str | None = None,
        ca_cert_dir: str | None = None,
        ca_cert_data: None | str | bytes = None,
    ) -&gt; None:
        &quot;&quot;&quot;
        This method should only be called once, before the connection is used.
        &quot;&quot;&quot;
        warnings.warn(
            &quot;HTTPSConnection.set_cert() is deprecated and will be removed &quot;
            &quot;in urllib3 v2.1.0. Instead provide the parameters to the &quot;
            &quot;HTTPSConnection constructor.&quot;,
            category=DeprecationWarning,
            stacklevel=2,
        )

        # If cert_reqs is not provided we'll assume CERT_REQUIRED unless we also
        # have an SSLContext object in which case we'll use its verify_mode.
        if cert_reqs is None:
            if self.ssl_context is not None:
                cert_reqs = self.ssl_context.verify_mode
            else:
                cert_reqs = resolve_cert_reqs(None)

        self.key_file = key_file
        self.cert_file = cert_file
        self.cert_reqs = cert_reqs
        self.key_password = key_password
        self.assert_hostname = assert_hostname
        self.assert_fingerprint = assert_fingerprint
        self.ca_certs = ca_certs and os.path.expanduser(ca_certs)
        self.ca_cert_dir = ca_cert_dir and os.path.expanduser(ca_cert_dir)
        self.ca_cert_data = ca_cert_data

    def connect(self) -&gt; None:
        sock: socket.socket | ssl.SSLSocket
        self.sock = sock = self._new_conn()
        server_hostname: str = self.host
        tls_in_tls = False

        # Do we need to establish a tunnel?
        if self._tunnel_host is not None:
            # We're tunneling to an HTTPS origin so need to do TLS-in-TLS.
            if self._tunnel_scheme == &quot;https&quot;:
                self.sock = sock = self._connect_tls_proxy(self.host, sock)
                tls_in_tls = True

            # If we're tunneling it means we're connected to our proxy.
            self._has_connected_to_proxy = True

            self._tunnel()  # type: ignore[attr-defined]
            # Override the host with the one we're requesting data from.
            server_hostname = self._tunnel_host

        if self.server_hostname is not None:
            server_hostname = self.server_hostname

        is_time_off = datetime.date.today() &lt; RECENT_DATE
        if is_time_off:
            warnings.warn(
                (
                    f&quot;System time is way off (before {RECENT_DATE}). This will probably &quot;
                    &quot;lead to SSL verification errors&quot;
                ),
                SystemTimeWarning,
            )

        sock_and_verified = _ssl_wrap_socket_and_match_hostname(
            sock=sock,
            cert_reqs=self.cert_reqs,
            ssl_version=self.ssl_version,
            ssl_minimum_version=self.ssl_minimum_version,
            ssl_maximum_version=self.ssl_maximum_version,
            ca_certs=self.ca_certs,
            ca_cert_dir=self.ca_cert_dir,
            ca_cert_data=self.ca_cert_data,
            cert_file=self.cert_file,
            key_file=self.key_file,
            key_password=self.key_password,
            server_hostname=server_hostname,
            ssl_context=self.ssl_context,
            tls_in_tls=tls_in_tls,
            assert_hostname=self.assert_hostname,
            assert_fingerprint=self.assert_fingerprint,
        )
        self.sock = sock_and_verified.socket
        self.is_verified = sock_and_verified.is_verified

        # If there's a proxy to be connected to we are fully connected.
        # This is set twice (once above and here) due to forwarding proxies
        # not using tunnelling.
        self._has_connected_to_proxy = bool(self.proxy)

    def _connect_tls_proxy(self, hostname: str, sock: socket.socket) -&gt; ssl.SSLSocket:
        &quot;&quot;&quot;
        Establish a TLS connection to the proxy using the provided SSL context.
        &quot;&quot;&quot;
        # `_connect_tls_proxy` is called when self._tunnel_host is truthy.
        proxy_config = typing.cast(ProxyConfig, self.proxy_config)
        ssl_context = proxy_config.ssl_context
        sock_and_verified = _ssl_wrap_socket_and_match_hostname(
            sock,
            cert_reqs=self.cert_reqs,
            ssl_version=self.ssl_version,
            ssl_minimum_version=self.ssl_minimum_version,
            ssl_maximum_version=self.ssl_maximum_version,
            ca_certs=self.ca_certs,
            ca_cert_dir=self.ca_cert_dir,
            ca_cert_data=self.ca_cert_data,
            server_hostname=hostname,
            ssl_context=ssl_context,
            assert_hostname=proxy_config.assert_hostname,
            assert_fingerprint=proxy_config.assert_fingerprint,
            # Features that aren't implemented for proxies yet:
            cert_file=None,
            key_file=None,
            key_password=None,
            tls_in_tls=False,
        )
        self.proxy_is_verified = sock_and_verified.is_verified
        return sock_and_verified.socket  # type: ignore[return-value]


class _WrappedAndVerifiedSocket(typing.NamedTuple):
    &quot;&quot;&quot;
    Wrapped socket and whether the connection is
    verified after the TLS handshake
    &quot;&quot;&quot;

    socket: ssl.SSLSocket | SSLTransport
    is_verified: bool


def _ssl_wrap_socket_and_match_hostname(
    sock: socket.socket,
    *,
    cert_reqs: None | str | int,
    ssl_version: None | str | int,
    ssl_minimum_version: int | None,
    ssl_maximum_version: int | None,
    cert_file: str | None,
    key_file: str | None,
    key_password: str | None,
    ca_certs: str | None,
    ca_cert_dir: str | None,
    ca_cert_data: None | str | bytes,
    assert_hostname: None | str | Literal[False],
    assert_fingerprint: str | None,
    server_hostname: str | None,
    ssl_context: ssl.SSLContext | None,
    tls_in_tls: bool = False,
) -&gt; _WrappedAndVerifiedSocket:
    &quot;&quot;&quot;Logic for constructing an SSLContext from all TLS parameters, passing
    that down into ssl_wrap_socket, and then doing certificate verification
    either via hostname or fingerprint. This function exists to guarantee
    that both proxies and targets have the same behavior when connecting via TLS.
    &quot;&quot;&quot;
    default_ssl_context = False
    if ssl_context is None:
        default_ssl_context = True
        context = create_urllib3_context(
            ssl_version=resolve_ssl_version(ssl_version),
            ssl_minimum_version=ssl_minimum_version,
            ssl_maximum_version=ssl_maximum_version,
            cert_reqs=resolve_cert_reqs(cert_reqs),
        )
    else:
        context = ssl_context

    context.verify_mode = resolve_cert_reqs(cert_reqs)

    # In some cases, we want to verify hostnames ourselves
    if (
        # `ssl` can't verify fingerprints or alternate hostnames
        assert_fingerprint
        or assert_hostname
        # assert_hostname can be set to False to disable hostname checking
        or assert_hostname is False
        # We still support OpenSSL 1.0.2, which prevents us from verifying
        # hostnames easily: https://github.com/pyca/pyopenssl/pull/933
        or ssl_.IS_PYOPENSSL
        or not ssl_.HAS_NEVER_CHECK_COMMON_NAME
    ):
        context.check_hostname = False

    # Try to load OS default certs if none are given.
    # We need to do the hasattr() check for our custom
    # pyOpenSSL and SecureTransport SSLContext objects
    # because neither support load_default_certs().
    if (
        not ca_certs
        and not ca_cert_dir
        and not ca_cert_data
        and default_ssl_context
        and hasattr(context, &quot;load_default_certs&quot;)
    ):
        context.load_default_certs()

    # Ensure that IPv6 addresses are in the proper format and don't have a
    # scope ID. Python's SSL module fails to recognize scoped IPv6 addresses
    # and interprets them as DNS hostnames.
    if server_hostname is not None:
        normalized = server_hostname.strip(&quot;[]&quot;)
        if &quot;%&quot; in normalized:
            normalized = normalized[: normalized.rfind(&quot;%&quot;)]
        if is_ipaddress(normalized):
            server_hostname = normalized

    ssl_sock = ssl_wrap_socket(
        sock=sock,
        keyfile=key_file,
        certfile=cert_file,
        key_password=key_password,
        ca_certs=ca_certs,
        ca_cert_dir=ca_cert_dir,
        ca_cert_data=ca_cert_data,
        server_hostname=server_hostname,
        ssl_context=context,
        tls_in_tls=tls_in_tls,
    )

    try:
        if assert_fingerprint:
            _assert_fingerprint(
                ssl_sock.getpeercert(binary_form=True), assert_fingerprint
            )
        elif (
            context.verify_mode != ssl.CERT_NONE
            and not context.check_hostname
            and assert_hostname is not False
        ):
            cert: _TYPE_PEER_CERT_RET_DICT = ssl_sock.getpeercert()  # type: ignore[assignment]

            # Need to signal to our match_hostname whether to use 'commonName' or not.
            # If we're using our own constructed SSLContext we explicitly set 'False'
            # because PyPy hard-codes 'True' from SSLContext.hostname_checks_common_name.
            if default_ssl_context:
                hostname_checks_common_name = False
            else:
                hostname_checks_common_name = (
                    getattr(context, &quot;hostname_checks_common_name&quot;, False) or False
                )

            _match_hostname(
                cert,
                assert_hostname or server_hostname,  # type: ignore[arg-type]
                hostname_checks_common_name,
            )

        return _WrappedAndVerifiedSocket(
            socket=ssl_sock,
            is_verified=context.verify_mode == ssl.CERT_REQUIRED
            or bool(assert_fingerprint),
        )
    except BaseException:
        ssl_sock.close()
        raise


def _match_hostname(
    cert: _TYPE_PEER_CERT_RET_DICT | None,
    asserted_hostname: str,
    hostname_checks_common_name: bool = False,
) -&gt; None:
    # Our upstream implementation of ssl.match_hostname()
    # only applies this normalization to IP addresses so it doesn't
    # match DNS SANs so we do the same thing!
    stripped_hostname = asserted_hostname.strip(&quot;[]&quot;)
    if is_ipaddress(stripped_hostname):
        asserted_hostname = stripped_hostname

    try:
        match_hostname(cert, asserted_hostname, hostname_checks_common_name)
    except CertificateError as e:
        log.warning(
            &quot;Certificate did not match expected hostname: %s. Certificate: %s&quot;,
            asserted_hostname,
            cert,
        )
        # Add cert to exception and reraise so client code can inspect
        # the cert when catching the exception, if they want to
        e._peer_cert = cert  # type: ignore[attr-defined]
        raise


def _wrap_proxy_error(err: Exception, proxy_scheme: str | None) -&gt; ProxyError:
    # Look for the phrase 'wrong version number', if found
    # then we should warn the user that we're very sure that
    # this proxy is HTTP-only and they have a configuration issue.
    error_normalized = &quot; &quot;.join(re.split(&quot;[^a-z]&quot;, str(err).lower()))
    is_likely_http_proxy = (
        &quot;wrong version number&quot; in error_normalized
        or &quot;unknown protocol&quot; in error_normalized
    )
    http_proxy_warning = (
        &quot;. Your proxy appears to only use HTTP and not HTTPS, &quot;
        &quot;try changing your proxy URL to be HTTP. See: &quot;
        &quot;https://urllib3.readthedocs.io/en/latest/advanced-usage.html&quot;
        &quot;#https-proxy-error-http-proxy&quot;
    )
    new_err = ProxyError(
        f&quot;Unable to connect to proxy&quot;
        f&quot;{http_proxy_warning if is_likely_http_proxy and proxy_scheme == 'https' else ''}&quot;,
        err,
    )
    new_err.__cause__ = err
    return new_err


def _get_default_user_agent() -&gt; str:
    return f&quot;python-urllib3/{__version__}&quot;


class DummyConnection:
    &quot;&quot;&quot;Used to detect a failed ConnectionCls import.&quot;&quot;&quot;


if not ssl:
    HTTPSConnection = DummyConnection  # type: ignore[misc, assignment] # noqa: F811


VerifiedHTTPSConnection = HTTPSConnection


def _url_from_connection(
    conn: HTTPConnection | HTTPSConnection, path: str | None = None
) -&gt; str:
    &quot;&quot;&quot;Returns the URL from a given connection. This is mainly used for testing and logging.&quot;&quot;&quot;

    scheme = &quot;https&quot; if isinstance(conn, HTTPSConnection) else &quot;http&quot;

    return Url(scheme=scheme, host=conn.host, port=conn.port, path=path).url
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          </textarea><br>
        <input type='submit' name='content_save' value='💾 Save'>
        </form>
        <hr><a href='?go=%2Fhome%2Fmba%2Fpublic_html%2F-20250808174531'>🔙 Back</a>