457 lines
15 KiB
Python
457 lines
15 KiB
Python
# Wrapper module for _socket, providing some additional facilities
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# implemented in Python.
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"""\
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This module provides socket operations and some related functions.
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On Unix, it supports IP (Internet Protocol) and Unix domain sockets.
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On other systems, it only supports IP. Functions specific for a
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socket are available as methods of the socket object.
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Functions:
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socket() -- create a new socket object
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socketpair() -- create a pair of new socket objects [*]
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fromfd() -- create a socket object from an open file descriptor [*]
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fromshare() -- create a socket object from data received from socket.share() [*]
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gethostname() -- return the current hostname
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gethostbyname() -- map a hostname to its IP number
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gethostbyaddr() -- map an IP number or hostname to DNS info
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getservbyname() -- map a service name and a protocol name to a port number
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getprotobyname() -- map a protocol name (e.g. 'tcp') to a number
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ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order
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htons(), htonl() -- convert 16, 32 bit int from host to network byte order
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inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format
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inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89)
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socket.getdefaulttimeout() -- get the default timeout value
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socket.setdefaulttimeout() -- set the default timeout value
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create_connection() -- connects to an address, with an optional timeout and
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optional source address.
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[*] not available on all platforms!
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Special objects:
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SocketType -- type object for socket objects
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error -- exception raised for I/O errors
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has_ipv6 -- boolean value indicating if IPv6 is supported
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Integer constants:
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AF_INET, AF_UNIX -- socket domains (first argument to socket() call)
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SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument)
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Many other constants may be defined; these may be used in calls to
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the setsockopt() and getsockopt() methods.
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"""
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import _socket
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from _socket import *
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import os, sys, io
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try:
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import errno
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except ModuleNotFoundError:
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errno = None
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EBADF = getattr(errno, 'EBADF', 9)
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EAGAIN = getattr(errno, 'EAGAIN', 11)
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EWOULDBLOCK = getattr(errno, 'EWOULDBLOCK', 11)
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__all__ = ["getfqdn", "create_connection"]
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__all__.extend(os._get_exports_list(_socket))
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_realsocket = socket
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# WSA error codes
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if sys.platform.lower().startswith("win"):
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errorTab = {}
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errorTab[10004] = "The operation was interrupted."
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errorTab[10009] = "A bad file handle was passed."
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errorTab[10013] = "Permission denied."
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errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT
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errorTab[10022] = "An invalid operation was attempted."
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errorTab[10035] = "The socket operation would block"
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errorTab[10036] = "A blocking operation is already in progress."
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errorTab[10048] = "The network address is in use."
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errorTab[10054] = "The connection has been reset."
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errorTab[10058] = "The network has been shut down."
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errorTab[10060] = "The operation timed out."
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errorTab[10061] = "Connection refused."
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errorTab[10063] = "The name is too long."
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errorTab[10064] = "The host is down."
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errorTab[10065] = "The host is unreachable."
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__all__.append("errorTab")
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class socket(_socket.socket):
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"""A subclass of _socket.socket adding the makefile() method."""
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__slots__ = ["__weakref__", "_io_refs", "_closed"]
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def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None):
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_socket.socket.__init__(self, family, type, proto, fileno)
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self._io_refs = 0
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self._closed = False
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def __enter__(self):
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return self
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def __exit__(self, *args):
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if not self._closed:
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self.close()
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def __repr__(self):
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"""Wrap __repr__() to reveal the real class name and socket
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address(es).
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"""
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closed = getattr(self, '_closed', False)
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s = "<%s.%s%s fd=%i, family=%i, type=%i, proto=%i" \
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% (self.__class__.__module__,
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self.__class__.__name__,
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" [closed]" if closed else "",
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self.fileno(),
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self.family,
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self.type,
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self.proto)
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if not closed:
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try:
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laddr = self.getsockname()
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if laddr:
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s += ", laddr=%s" % str(laddr)
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except error:
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pass
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try:
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raddr = self.getpeername()
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if raddr:
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s += ", raddr=%s" % str(raddr)
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except error:
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pass
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s += '>'
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return s
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def __getstate__(self):
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raise TypeError("Cannot serialize socket object")
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def dup(self):
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"""dup() -> socket object
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Return a new socket object connected to the same system resource.
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"""
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fd = dup(self.fileno())
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sock = self.__class__(self.family, self.type, self.proto, fileno=fd)
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sock.settimeout(self.gettimeout())
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return sock
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def accept(self):
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"""accept() -> (socket object, address info)
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Wait for an incoming connection. Return a new socket
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representing the connection, and the address of the client.
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For IP sockets, the address info is a pair (hostaddr, port).
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"""
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fd, addr = self._accept()
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sock = socket(self.family, self.type, self.proto, fileno=fd)
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# Issue #7995: if no default timeout is set and the listening
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# socket had a (non-zero) timeout, force the new socket in blocking
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# mode to override platform-specific socket flags inheritance.
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if getdefaulttimeout() is None and self.gettimeout():
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sock.setblocking(True)
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return sock, addr
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def makefile(self, mode="r", buffering=None, *,
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encoding=None, errors=None, newline=None):
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"""makefile(...) -> an I/O stream connected to the socket
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The arguments are as for io.open() after the filename,
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except the only mode characters supported are 'r', 'w' and 'b'.
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The semantics are similar too. (XXX refactor to share code?)
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"""
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for c in mode:
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if c not in {"r", "w", "b"}:
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raise ValueError("invalid mode %r (only r, w, b allowed)")
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writing = "w" in mode
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reading = "r" in mode or not writing
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assert reading or writing
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binary = "b" in mode
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rawmode = ""
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if reading:
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rawmode += "r"
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if writing:
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rawmode += "w"
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raw = SocketIO(self, rawmode)
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self._io_refs += 1
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if buffering is None:
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buffering = -1
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if buffering < 0:
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buffering = io.DEFAULT_BUFFER_SIZE
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if buffering == 0:
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if not binary:
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raise ValueError("unbuffered streams must be binary")
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return raw
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if reading and writing:
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buffer = io.BufferedRWPair(raw, raw, buffering)
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elif reading:
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buffer = io.BufferedReader(raw, buffering)
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else:
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assert writing
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buffer = io.BufferedWriter(raw, buffering)
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if binary:
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return buffer
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text = io.TextIOWrapper(buffer, encoding, errors, newline)
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text.mode = mode
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return text
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def _decref_socketios(self):
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if self._io_refs > 0:
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self._io_refs -= 1
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if self._closed:
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self.close()
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def _real_close(self, _ss=_socket.socket):
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# This function should not reference any globals. See issue #808164.
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_ss.close(self)
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def close(self):
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# This function should not reference any globals. See issue #808164.
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self._closed = True
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if self._io_refs <= 0:
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self._real_close()
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def detach(self):
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"""detach() -> file descriptor
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Close the socket object without closing the underlying file descriptor.
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The object cannot be used after this call, but the file descriptor
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can be reused for other purposes. The file descriptor is returned.
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"""
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self._closed = True
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return super().detach()
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def fromfd(fd, family, type, proto=0):
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""" fromfd(fd, family, type[, proto]) -> socket object
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Create a socket object from a duplicate of the given file
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descriptor. The remaining arguments are the same as for socket().
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"""
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nfd = dup(fd)
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return socket(family, type, proto, nfd)
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if hasattr(_socket.socket, "share"):
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def fromshare(info):
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""" fromshare(info) -> socket object
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Create a socket object from a the bytes object returned by
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socket.share(pid).
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"""
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return socket(0, 0, 0, info)
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if hasattr(_socket, "socketpair"):
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def socketpair(family=None, type=SOCK_STREAM, proto=0):
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"""socketpair([family[, type[, proto]]]) -> (socket object, socket object)
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Create a pair of socket objects from the sockets returned by the platform
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socketpair() function.
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The arguments are the same as for socket() except the default family is
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AF_UNIX if defined on the platform; otherwise, the default is AF_INET.
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"""
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if family is None:
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try:
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family = AF_UNIX
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except NameError:
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family = AF_INET
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a, b = _socket.socketpair(family, type, proto)
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a = socket(family, type, proto, a.detach())
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b = socket(family, type, proto, b.detach())
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return a, b
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_blocking_errnos = { EAGAIN, EWOULDBLOCK }
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class SocketIO(io.RawIOBase):
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"""Raw I/O implementation for stream sockets.
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This class supports the makefile() method on sockets. It provides
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the raw I/O interface on top of a socket object.
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"""
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# One might wonder why not let FileIO do the job instead. There are two
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# main reasons why FileIO is not adapted:
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# - it wouldn't work under Windows (where you can't used read() and
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# write() on a socket handle)
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# - it wouldn't work with socket timeouts (FileIO would ignore the
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# timeout and consider the socket non-blocking)
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# XXX More docs
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def __init__(self, sock, mode):
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if mode not in ("r", "w", "rw", "rb", "wb", "rwb"):
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raise ValueError("invalid mode: %r" % mode)
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io.RawIOBase.__init__(self)
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self._sock = sock
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if "b" not in mode:
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mode += "b"
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self._mode = mode
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self._reading = "r" in mode
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self._writing = "w" in mode
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self._timeout_occurred = False
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def readinto(self, b):
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"""Read up to len(b) bytes into the writable buffer *b* and return
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the number of bytes read. If the socket is non-blocking and no bytes
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are available, None is returned.
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If *b* is non-empty, a 0 return value indicates that the connection
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was shutdown at the other end.
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"""
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self._checkClosed()
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self._checkReadable()
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if self._timeout_occurred:
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raise OSError("cannot read from timed out object")
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while True:
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try:
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return self._sock.recv_into(b)
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except timeout:
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self._timeout_occurred = True
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raise
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except InterruptedError:
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continue
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except error as e:
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if e.args[0] in _blocking_errnos:
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return None
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raise
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def write(self, b):
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"""Write the given bytes or bytearray object *b* to the socket
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and return the number of bytes written. This can be less than
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len(b) if not all data could be written. If the socket is
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non-blocking and no bytes could be written None is returned.
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"""
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self._checkClosed()
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self._checkWritable()
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try:
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return self._sock.send(b)
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except error as e:
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# XXX what about EINTR?
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if e.args[0] in _blocking_errnos:
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return None
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raise
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def readable(self):
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"""True if the SocketIO is open for reading.
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"""
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if self.closed:
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raise ValueError("I/O operation on closed socket.")
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return self._reading
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def writable(self):
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"""True if the SocketIO is open for writing.
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"""
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if self.closed:
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raise ValueError("I/O operation on closed socket.")
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return self._writing
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def seekable(self):
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"""True if the SocketIO is open for seeking.
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"""
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if self.closed:
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raise ValueError("I/O operation on closed socket.")
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return super().seekable()
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def fileno(self):
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"""Return the file descriptor of the underlying socket.
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"""
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self._checkClosed()
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return self._sock.fileno()
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@property
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def name(self):
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if not self.closed:
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return self.fileno()
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else:
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return -1
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@property
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def mode(self):
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return self._mode
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def close(self):
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"""Close the SocketIO object. This doesn't close the underlying
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socket, except if all references to it have disappeared.
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"""
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if self.closed:
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return
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io.RawIOBase.close(self)
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self._sock._decref_socketios()
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self._sock = None
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def getfqdn(name=''):
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"""Get fully qualified domain name from name.
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An empty argument is interpreted as meaning the local host.
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First the hostname returned by gethostbyaddr() is checked, then
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possibly existing aliases. In case no FQDN is available, hostname
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from gethostname() is returned.
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"""
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name = name.strip()
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if not name or name == '0.0.0.0':
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name = gethostname()
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try:
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hostname, aliases, ipaddrs = gethostbyaddr(name)
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except error:
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pass
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else:
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aliases.insert(0, hostname)
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for name in aliases:
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if '.' in name:
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break
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else:
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name = hostname
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return name
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_GLOBAL_DEFAULT_TIMEOUT = object()
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def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
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source_address=None):
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"""Connect to *address* and return the socket object.
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Convenience function. Connect to *address* (a 2-tuple ``(host,
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port)``) and return the socket object. Passing the optional
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*timeout* parameter will set the timeout on the socket instance
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before attempting to connect. If no *timeout* is supplied, the
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global default timeout setting returned by :func:`getdefaulttimeout`
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is used. If *source_address* is set it must be a tuple of (host, port)
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for the socket to bind as a source address before making the connection.
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An host of '' or port 0 tells the OS to use the default.
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"""
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host, port = address
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err = None
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for res in getaddrinfo(host, port, 0, SOCK_STREAM):
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af, socktype, proto, canonname, sa = res
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sock = None
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try:
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sock = socket(af, socktype, proto)
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if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
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sock.settimeout(timeout)
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if source_address:
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sock.bind(source_address)
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sock.connect(sa)
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return sock
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except error as _:
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err = _
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if sock is not None:
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sock.close()
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if err is not None:
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raise err
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else:
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raise error("getaddrinfo returns an empty list")
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