# Wrapper module for _socket, providing some additional facilities
# implemented in Python.

"""\
This module provides socket operations and some related functions.
On Unix, it supports IP (Internet Protocol) and Unix domain sockets.
On other systems, it only supports IP. Functions specific for a
socket are available as methods of the socket object.

Functions:

socket() -- create a new socket object
socketpair() -- create a pair of new socket objects [*]
fromfd() -- create a socket object from an open file descriptor [*]
fromshare() -- create a socket object from data received from socket.share() [*]
gethostname() -- return the current hostname
gethostbyname() -- map a hostname to its IP number
gethostbyaddr() -- map an IP number or hostname to DNS info
getservbyname() -- map a service name and a protocol name to a port number
getprotobyname() -- map a protocol name (e.g. 'tcp') to a number
ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order
htons(), htonl() -- convert 16, 32 bit int from host to network byte order
inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format
inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89)
socket.getdefaulttimeout() -- get the default timeout value
socket.setdefaulttimeout() -- set the default timeout value
create_connection() -- connects to an address, with an optional timeout and
 optional source address.

 [*] not available on all platforms!

Special objects:

SocketType -- type object for socket objects
error -- exception raised for I/O errors
has_ipv6 -- boolean value indicating if IPv6 is supported

IntEnum constants:

AF_INET, AF_UNIX -- socket domains (first argument to socket() call)
SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument)

Integer constants:

Many other constants may be defined; these may be used in calls to
the setsockopt() and getsockopt() methods.
"""

import _socket
from _socket import *

import os, sys, io
from enum import IntEnum

try:
 import errno
except ImportError:
 errno = None
EBADF = getattr(errno, 'EBADF', 9)
EAGAIN = getattr(errno, 'EAGAIN', 11)
EWOULDBLOCK = getattr(errno, 'EWOULDBLOCK', 11)

__all__ = ["fromfd", "getfqdn", "create_connection",
 "AddressFamily", "SocketKind"]
__all__.extend(os._get_exports_list(_socket))

# Set up the socket.AF_* socket.SOCK_* constants as members of IntEnums for
# nicer string representations.
# Note that _socket only knows about the integer values. The public interface
# in this module understands the enums and translates them back from integers
# where needed (e.g. .family property of a socket object).
AddressFamily = IntEnum('AddressFamily',
 {name: value for name, value in globals().items()
 if name.isupper() and name.startswith('AF_')})
globals().update(AddressFamily.__members__)

SocketKind = IntEnum('SocketKind',
 {name: value for name, value in globals().items()
 if name.isupper() and name.startswith('SOCK_')})
globals().update(SocketKind.__members__)

def _intenum_converter(value, enum_klass):
 """Convert a numeric family value to an IntEnum member.

 If it's not a known member, return the numeric value itself.
 """
 try:
 return enum_klass(value)
 except ValueError:
 return value

_realsocket = socket

# WSA error codes
if sys.platform.lower().startswith("win"):
 errorTab = {}
 errorTab[10004] = "The operation was interrupted."
 errorTab[10009] = "A bad file handle was passed."
 errorTab[10013] = "Permission denied."
 errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT
 errorTab[10022] = "An invalid operation was attempted."
 errorTab[10035] = "The socket operation would block"
 errorTab[10036] = "A blocking operation is already in progress."
 errorTab[10048] = "The network address is in use."
 errorTab[10054] = "The connection has been reset."
 errorTab[10058] = "The network has been shut down."
 errorTab[10060] = "The operation timed out."
 errorTab[10061] = "Connection refused."
 errorTab[10063] = "The name is too long."
 errorTab[10064] = "The host is down."
 errorTab[10065] = "The host is unreachable."
 __all__.append("errorTab")


class socket(_socket.socket):

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

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

 def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None):
 # For user code address family and type values are IntEnum members, but
 # for the underlying _socket.socket they're just integers. The
 # constructor of _socket.socket converts the given argument to an
 # integer automatically.
 _socket.socket.__init__(self, family, type, proto, fileno)
 self._io_refs = 0
 self._closed = False

 def __enter__(self):
 return self

 def __exit__(self, *args):
 if not self._closed:
 self.close()

 def __repr__(self):
 """Wrap __repr__() to reveal the real class name and socket
 address(es).
 """
 closed = getattr(self, '_closed', False)
 s = "<%s.%s%s fd=%i, family=%s, type=%s, proto=%i" \
 % (self.__class__.__module__,
 self.__class__.__name__,
 " [closed]" if closed else "",
 self.fileno(),
 self.family,
 self.type,
 self.proto)
 if not closed:
 try:
 laddr = self.getsockname()
 if laddr:
 s += ", laddr=%s" % str(laddr)
 except error:
 pass
 try:
 raddr = self.getpeername()
 if raddr:
 s += ", raddr=%s" % str(raddr)
 except error:
 pass
 s += '>'
 return s

 def __getstate__(self):
 raise TypeError("Cannot serialize socket object")

 def dup(self):
 """dup() -> socket object

 Duplicate the socket. Return a new socket object connected to the same
 system resource. The new socket is non-inheritable.
 """
 fd = dup(self.fileno())
 sock = self.__class__(self.family, self.type, self.proto, fileno=fd)
 sock.settimeout(self.gettimeout())
 return sock

 def accept(self):
 """accept() -> (socket object, address info)

 Wait for an incoming connection. Return a new socket
 representing the connection, and the address of the client.
 For IP sockets, the address info is a pair (hostaddr, port).
 """
 fd, addr = self._accept()
 sock = socket(self.family, self.type, self.proto, fileno=fd)
 # Issue #7995: if no default timeout is set and the listening
 # socket had a (non-zero) timeout, force the new socket in blocking
 # mode to override platform-specific socket flags inheritance.
 if getdefaulttimeout() is None and self.gettimeout():
 sock.setblocking(True)
 return sock, addr

 def makefile(self, mode="r", buffering=None, *,
 encoding=None, errors=None, newline=None):
 """makefile(...) -> an I/O stream connected to the socket

 The arguments are as for io.open() after the filename,
 except the only mode characters supported are 'r', 'w' and 'b'.
 The semantics are similar too. (XXX refactor to share code?)
 """
 if not set(mode) <= {"r", "w", "b"}:
 raise ValueError("invalid mode %r (only r, w, b allowed)" % (mode,))
 writing = "w" in mode
 reading = "r" in mode or not writing
 assert reading or writing
 binary = "b" in mode
 rawmode = ""
 if reading:
 rawmode += "r"
 if writing:
 rawmode += "w"
 raw = SocketIO(self, rawmode)
 self._io_refs += 1
 if buffering is None:
 buffering = -1
 if buffering < 0:
 buffering = io.DEFAULT_BUFFER_SIZE
 if buffering == 0:
 if not binary:
 raise ValueError("unbuffered streams must be binary")
 return raw
 if reading and writing:
 buffer = io.BufferedRWPair(raw, raw, buffering)
 elif reading:
 buffer = io.BufferedReader(raw, buffering)
 else:
 assert writing
 buffer = io.BufferedWriter(raw, buffering)
 if binary:
 return buffer
 text = io.TextIOWrapper(buffer, encoding, errors, newline)
 text.mode = mode
 return text

 def _decref_socketios(self):
 if self._io_refs > 0:
 self._io_refs -= 1
 if self._closed:
 self.close()

 def _real_close(self, _ss=_socket.socket):
 # This function should not reference any globals. See issue #808164.
 _ss.close(self)

 def close(self):
 # This function should not reference any globals. See issue #808164.
 self._closed = True
 if self._io_refs <= 0:
 self._real_close()

 def detach(self):
 """detach() -> file descriptor

 Close the socket object without closing the underlying file descriptor.
 The object cannot be used after this call, but the file descriptor
 can be reused for other purposes. The file descriptor is returned.
 """
 self._closed = True
 return super().detach()

 @property
 def family(self):
 """Read-only access to the address family for this socket.
 """
 return _intenum_converter(super().family, AddressFamily)

 @property
 def type(self):
 """Read-only access to the socket type.
 """
 return _intenum_converter(super().type, SocketKind)

 if os.name == 'nt':
 def get_inheritable(self):
 return os.get_handle_inheritable(self.fileno())
 def set_inheritable(self, inheritable):
 os.set_handle_inheritable(self.fileno(), inheritable)
 else:
 def get_inheritable(self):
 return os.get_inheritable(self.fileno())
 def set_inheritable(self, inheritable):
 os.set_inheritable(self.fileno(), inheritable)
 get_inheritable.__doc__ = "Get the inheritable flag of the socket"
 set_inheritable.__doc__ = "Set the inheritable flag of the socket"

def fromfd(fd, family, type, proto=0):
 """ fromfd(fd, family, type[, proto]) -> socket object

 Create a socket object from a duplicate of the given file
 descriptor. The remaining arguments are the same as for socket().
 """
 nfd = dup(fd)
 return socket(family, type, proto, nfd)

if hasattr(_socket.socket, "share"):
 def fromshare(info):
 """ fromshare(info) -> socket object

 Create a socket object from the bytes object returned by
 socket.share(pid).
 """
 return socket(0, 0, 0, info)
 __all__.append("fromshare")

if hasattr(_socket, "socketpair"):

 def socketpair(family=None, type=SOCK_STREAM, proto=0):
 """socketpair([family[, type[, proto]]]) -> (socket object, socket object)

 Create a pair of socket objects from the sockets returned by the platform
 socketpair() function.
 The arguments are the same as for socket() except the default family is
 AF_UNIX if defined on the platform; otherwise, the default is AF_INET.
 """
 if family is None:
 try:
 family = AF_UNIX
 except NameError:
 family = AF_INET
 a, b = _socket.socketpair(family, type, proto)
 a = socket(family, type, proto, a.detach())
 b = socket(family, type, proto, b.detach())
 return a, b


_blocking_errnos = { EAGAIN, EWOULDBLOCK }

class SocketIO(io.RawIOBase):

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

 This class supports the makefile() method on sockets. It provides
 the raw I/O interface on top of a socket object.
 """

 # One might wonder why not let FileIO do the job instead. There are two
 # main reasons why FileIO is not adapted:
 # - it wouldn't work under Windows (where you can't used read() and
 # write() on a socket handle)
 # - it wouldn't work with socket timeouts (FileIO would ignore the
 # timeout and consider the socket non-blocking)

 # XXX More docs

 def __init__(self, sock, mode):
 if mode not in ("r", "w", "rw", "rb", "wb", "rwb"):
 raise ValueError("invalid mode: %r" % mode)
 io.RawIOBase.__init__(self)
 self._sock = sock
 if "b" not in mode:
 mode += "b"
 self._mode = mode
 self._reading = "r" in mode
 self._writing = "w" in mode
 self._timeout_occurred = False

 def readinto(self, b):
 """Read up to len(b) bytes into the writable buffer *b* and return
 the number of bytes read. If the socket is non-blocking and no bytes
 are available, None is returned.

 If *b* is non-empty, a 0 return value indicates that the connection
 was shutdown at the other end.
 """
 self._checkClosed()
 self._checkReadable()
 if self._timeout_occurred:
 raise OSError("cannot read from timed out object")
 while True:
 try:
 return self._sock.recv_into(b)
 except timeout:
 self._timeout_occurred = True
 raise
 except InterruptedError:
 continue
 except error as e:
 if e.args[0] in _blocking_errnos:
 return None
 raise

 def write(self, b):
 """Write the given bytes or bytearray object *b* to the socket
 and return the number of bytes written. This can be less than
 len(b) if not all data could be written. If the socket is
 non-blocking and no bytes could be written None is returned.
 """
 self._checkClosed()
 self._checkWritable()
 try:
 return self._sock.send(b)
 except error as e:
 # XXX what about EINTR?
 if e.args[0] in _blocking_errnos:
 return None
 raise

 def readable(self):
 """True if the SocketIO is open for reading.
 """
 if self.closed:
 raise ValueError("I/O operation on closed socket.")
 return self._reading

 def writable(self):
 """True if the SocketIO is open for writing.
 """
 if self.closed:
 raise ValueError("I/O operation on closed socket.")
 return self._writing

 def seekable(self):
 """True if the SocketIO is open for seeking.
 """
 if self.closed:
 raise ValueError("I/O operation on closed socket.")
 return super().seekable()

 def fileno(self):
 """Return the file descriptor of the underlying socket.
 """
 self._checkClosed()
 return self._sock.fileno()

 @property
 def name(self):
 if not self.closed:
 return self.fileno()
 else:
 return -1

 @property
 def mode(self):
 return self._mode

 def close(self):
 """Close the SocketIO object. This doesn't close the underlying
 socket, except if all references to it have disappeared.
 """
 if self.closed:
 return
 io.RawIOBase.close(self)
 self._sock._decref_socketios()
 self._sock = None


def getfqdn(name=''):
 """Get fully qualified domain name from name.

 An empty argument is interpreted as meaning the local host.

 First the hostname returned by gethostbyaddr() is checked, then
 possibly existing aliases. In case no FQDN is available, hostname
 from gethostname() is returned.
 """
 name = name.strip()
 if not name or name == '0.0.0.0':
 name = gethostname()
 try:
 hostname, aliases, ipaddrs = gethostbyaddr(name)
 except error:
 pass
 else:
 aliases.insert(0, hostname)
 for name in aliases:
 if '.' in name:
 break
 else:
 name = hostname
 return name


_GLOBAL_DEFAULT_TIMEOUT = object()

def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
 source_address=None):
 """Connect to *address* and return the socket object.

 Convenience function. Connect to *address* (a 2-tuple ``(host,
 port)``) and return the socket object. Passing the optional
 *timeout* parameter will set the timeout on the socket instance
 before attempting to connect. If no *timeout* is supplied, the
 global default timeout setting returned by :func:`getdefaulttimeout`
 is used. If *source_address* is set it must be a tuple of (host, port)
 for the socket to bind as a source address before making the connection.
 An host of '' or port 0 tells the OS to use the default.
 """

 host, port = address
 err = None
 for res in getaddrinfo(host, port, 0, SOCK_STREAM):
 af, socktype, proto, canonname, sa = res
 sock = None
 try:
 sock = socket(af, socktype, proto)
 if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
 sock.settimeout(timeout)
 if source_address:
 sock.bind(source_address)
 sock.connect(sa)
 return sock

 except error as _:
 err = _
 if sock is not None:
 sock.close()

 if err is not None:
 raise err
 else:
 raise error("getaddrinfo returns an empty list")

def getaddrinfo(host, port, family=0, type=0, proto=0, flags=0):
 """Resolve host and port into list of address info entries.

 Translate the host/port argument into a sequence of 5-tuples that contain
 all the necessary arguments for creating a socket connected to that service.
 host is a domain name, a string representation of an IPv4/v6 address or
 None. port is a string service name such as 'http', a numeric port number or
 None. By passing None as the value of host and port, you can pass NULL to
 the underlying C API.

 The family, type and proto arguments can be optionally specified in order to
 narrow the list of addresses returned. Passing zero as a value for each of
 these arguments selects the full range of results.
 """
 # We override this function since we want to translate the numeric family
 # and socket type values to enum constants.
 addrlist = []
 for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
 af, socktype, proto, canonname, sa = res
 addrlist.append((_intenum_converter(af, AddressFamily),
 _intenum_converter(socktype, SocketKind),
 proto, canonname, sa))
 return addrlist