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751 lines
27 KiB
Python
751 lines
27 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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IntEnum 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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Integer constants:
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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, selectors
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from enum import IntEnum, IntFlag
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try:
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import errno
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except ImportError:
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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__ = ["fromfd", "getfqdn", "create_connection",
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"AddressFamily", "SocketKind"]
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__all__.extend(os._get_exports_list(_socket))
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# Set up the socket.AF_* socket.SOCK_* constants as members of IntEnums for
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# nicer string representations.
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# Note that _socket only knows about the integer values. The public interface
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# in this module understands the enums and translates them back from integers
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# where needed (e.g. .family property of a socket object).
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IntEnum._convert(
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'AddressFamily',
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__name__,
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lambda C: C.isupper() and C.startswith('AF_'))
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IntEnum._convert(
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'SocketKind',
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__name__,
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lambda C: C.isupper() and C.startswith('SOCK_'))
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IntFlag._convert(
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'MsgFlag',
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__name__,
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lambda C: C.isupper() and C.startswith('MSG_'))
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IntFlag._convert(
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'AddressInfo',
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__name__,
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lambda C: C.isupper() and C.startswith('AI_'))
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_LOCALHOST = '127.0.0.1'
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_LOCALHOST_V6 = '::1'
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def _intenum_converter(value, enum_klass):
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"""Convert a numeric family value to an IntEnum member.
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If it's not a known member, return the numeric value itself.
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"""
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try:
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return enum_klass(value)
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except ValueError:
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return value
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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 _GiveupOnSendfile(Exception): pass
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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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# For user code address family and type values are IntEnum members, but
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# for the underlying _socket.socket they're just integers. The
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# constructor of _socket.socket converts the given argument to an
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# integer automatically.
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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=%s, type=%s, proto=%i" \
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% (self.__class__.__module__,
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self.__class__.__qualname__,
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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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Duplicate the socket. Return a new socket object connected to the same
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system resource. The new socket is non-inheritable.
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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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# If our type has the SOCK_NONBLOCK flag, we shouldn't pass it onto the
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# new socket. We do not currently allow passing SOCK_NONBLOCK to
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# accept4, so the returned socket is always blocking.
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type = self.type & ~globals().get("SOCK_NONBLOCK", 0)
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sock = socket(self.family, 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, except the only
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supported mode values are 'r' (default), 'w' and 'b'.
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"""
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# XXX refactor to share code?
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if not set(mode) <= {"r", "w", "b"}:
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raise ValueError("invalid mode %r (only r, w, b allowed)" % (mode,))
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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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if hasattr(os, 'sendfile'):
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def _sendfile_use_sendfile(self, file, offset=0, count=None):
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self._check_sendfile_params(file, offset, count)
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sockno = self.fileno()
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try:
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fileno = file.fileno()
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except (AttributeError, io.UnsupportedOperation) as err:
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raise _GiveupOnSendfile(err) # not a regular file
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try:
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fsize = os.fstat(fileno).st_size
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except OSError as err:
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raise _GiveupOnSendfile(err) # not a regular file
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if not fsize:
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return 0 # empty file
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blocksize = fsize if not count else count
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timeout = self.gettimeout()
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if timeout == 0:
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raise ValueError("non-blocking sockets are not supported")
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# poll/select have the advantage of not requiring any
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# extra file descriptor, contrarily to epoll/kqueue
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# (also, they require a single syscall).
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if hasattr(selectors, 'PollSelector'):
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selector = selectors.PollSelector()
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else:
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selector = selectors.SelectSelector()
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selector.register(sockno, selectors.EVENT_WRITE)
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total_sent = 0
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# localize variable access to minimize overhead
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selector_select = selector.select
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os_sendfile = os.sendfile
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try:
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while True:
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if timeout and not selector_select(timeout):
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raise _socket.timeout('timed out')
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if count:
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blocksize = count - total_sent
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if blocksize <= 0:
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break
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try:
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sent = os_sendfile(sockno, fileno, offset, blocksize)
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except BlockingIOError:
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if not timeout:
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# Block until the socket is ready to send some
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# data; avoids hogging CPU resources.
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selector_select()
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continue
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except OSError as err:
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if total_sent == 0:
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# We can get here for different reasons, the main
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# one being 'file' is not a regular mmap(2)-like
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# file, in which case we'll fall back on using
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# plain send().
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raise _GiveupOnSendfile(err)
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raise err from None
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else:
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if sent == 0:
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break # EOF
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offset += sent
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total_sent += sent
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return total_sent
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finally:
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if total_sent > 0 and hasattr(file, 'seek'):
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file.seek(offset)
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else:
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def _sendfile_use_sendfile(self, file, offset=0, count=None):
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raise _GiveupOnSendfile(
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"os.sendfile() not available on this platform")
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def _sendfile_use_send(self, file, offset=0, count=None):
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self._check_sendfile_params(file, offset, count)
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if self.gettimeout() == 0:
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raise ValueError("non-blocking sockets are not supported")
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if offset:
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file.seek(offset)
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blocksize = min(count, 8192) if count else 8192
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total_sent = 0
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# localize variable access to minimize overhead
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file_read = file.read
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sock_send = self.send
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try:
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while True:
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if count:
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blocksize = min(count - total_sent, blocksize)
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if blocksize <= 0:
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break
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data = memoryview(file_read(blocksize))
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if not data:
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break # EOF
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while True:
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try:
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sent = sock_send(data)
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except BlockingIOError:
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continue
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else:
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total_sent += sent
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if sent < len(data):
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data = data[sent:]
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else:
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break
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return total_sent
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finally:
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if total_sent > 0 and hasattr(file, 'seek'):
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file.seek(offset + total_sent)
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def _check_sendfile_params(self, file, offset, count):
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if 'b' not in getattr(file, 'mode', 'b'):
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raise ValueError("file should be opened in binary mode")
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if not self.type & SOCK_STREAM:
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raise ValueError("only SOCK_STREAM type sockets are supported")
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if count is not None:
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if not isinstance(count, int):
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raise TypeError(
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"count must be a positive integer (got {!r})".format(count))
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if count <= 0:
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raise ValueError(
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"count must be a positive integer (got {!r})".format(count))
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def sendfile(self, file, offset=0, count=None):
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"""sendfile(file[, offset[, count]]) -> sent
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Send a file until EOF is reached by using high-performance
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os.sendfile() and return the total number of bytes which
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were sent.
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*file* must be a regular file object opened in binary mode.
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If os.sendfile() is not available (e.g. Windows) or file is
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not a regular file socket.send() will be used instead.
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*offset* tells from where to start reading the file.
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If specified, *count* is the total number of bytes to transmit
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as opposed to sending the file until EOF is reached.
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File position is updated on return or also in case of error in
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which case file.tell() can be used to figure out the number of
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bytes which were sent.
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The socket must be of SOCK_STREAM type.
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Non-blocking sockets are not supported.
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"""
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try:
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return self._sendfile_use_sendfile(file, offset, count)
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except _GiveupOnSendfile:
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return self._sendfile_use_send(file, offset, count)
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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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@property
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def family(self):
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"""Read-only access to the address family for this socket.
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"""
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return _intenum_converter(super().family, AddressFamily)
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@property
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def type(self):
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"""Read-only access to the socket type.
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"""
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return _intenum_converter(super().type, SocketKind)
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if os.name == 'nt':
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def get_inheritable(self):
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return os.get_handle_inheritable(self.fileno())
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def set_inheritable(self, inheritable):
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os.set_handle_inheritable(self.fileno(), inheritable)
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else:
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def get_inheritable(self):
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return os.get_inheritable(self.fileno())
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def set_inheritable(self, inheritable):
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os.set_inheritable(self.fileno(), inheritable)
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get_inheritable.__doc__ = "Get the inheritable flag of the socket"
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set_inheritable.__doc__ = "Set the inheritable flag of the socket"
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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 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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__all__.append("fromshare")
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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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else:
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# Origin: https://gist.github.com/4325783, by Geert Jansen. Public domain.
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def socketpair(family=AF_INET, type=SOCK_STREAM, proto=0):
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if family == AF_INET:
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host = _LOCALHOST
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elif family == AF_INET6:
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host = _LOCALHOST_V6
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else:
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raise ValueError("Only AF_INET and AF_INET6 socket address families "
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"are supported")
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if type != SOCK_STREAM:
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raise ValueError("Only SOCK_STREAM socket type is supported")
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if proto != 0:
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raise ValueError("Only protocol zero is supported")
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# We create a connected TCP socket. Note the trick with
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# setblocking(False) that prevents us from having to create a thread.
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lsock = socket(family, type, proto)
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try:
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lsock.bind((host, 0))
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|
lsock.listen()
|
|
# On IPv6, ignore flow_info and scope_id
|
|
addr, port = lsock.getsockname()[:2]
|
|
csock = socket(family, type, proto)
|
|
try:
|
|
csock.setblocking(False)
|
|
try:
|
|
csock.connect((addr, port))
|
|
except (BlockingIOError, InterruptedError):
|
|
pass
|
|
csock.setblocking(True)
|
|
ssock, _ = lsock.accept()
|
|
except:
|
|
csock.close()
|
|
raise
|
|
finally:
|
|
lsock.close()
|
|
return (ssock, csock)
|
|
__all__.append("socketpair")
|
|
|
|
socketpair.__doc__ = """socketpair([family[, type[, proto]]]) -> (socket object, socket object)
|
|
Create a pair of socket objects from the sockets returned by the platform
|
|
socketpair() function.
|
|
The arguments are the same as for socket() except the default family is AF_UNIX
|
|
if defined on the platform; otherwise, the default is AF_INET.
|
|
"""
|
|
|
|
_blocking_errnos = { EAGAIN, EWOULDBLOCK }
|
|
|
|
class SocketIO(io.RawIOBase):
|
|
|
|
"""Raw I/O implementation for stream sockets.
|
|
|
|
This class supports the makefile() method on sockets. It provides
|
|
the raw I/O interface on top of a socket object.
|
|
"""
|
|
|
|
# One might wonder why not let FileIO do the job instead. There are two
|
|
# main reasons why FileIO is not adapted:
|
|
# - it wouldn't work under Windows (where you can't used read() and
|
|
# write() on a socket handle)
|
|
# - it wouldn't work with socket timeouts (FileIO would ignore the
|
|
# timeout and consider the socket non-blocking)
|
|
|
|
# XXX More docs
|
|
|
|
def __init__(self, sock, mode):
|
|
if mode not in ("r", "w", "rw", "rb", "wb", "rwb"):
|
|
raise ValueError("invalid mode: %r" % mode)
|
|
io.RawIOBase.__init__(self)
|
|
self._sock = sock
|
|
if "b" not in mode:
|
|
mode += "b"
|
|
self._mode = mode
|
|
self._reading = "r" in mode
|
|
self._writing = "w" in mode
|
|
self._timeout_occurred = False
|
|
|
|
def readinto(self, b):
|
|
"""Read up to len(b) bytes into the writable buffer *b* and return
|
|
the number of bytes read. If the socket is non-blocking and no bytes
|
|
are available, None is returned.
|
|
|
|
If *b* is non-empty, a 0 return value indicates that the connection
|
|
was shutdown at the other end.
|
|
"""
|
|
self._checkClosed()
|
|
self._checkReadable()
|
|
if self._timeout_occurred:
|
|
raise OSError("cannot read from timed out object")
|
|
while True:
|
|
try:
|
|
return self._sock.recv_into(b)
|
|
except timeout:
|
|
self._timeout_occurred = True
|
|
raise
|
|
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.
|
|
A 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)
|
|
# Break explicitly a reference cycle
|
|
err = None
|
|
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
|