338 lines
10 KiB
Python
338 lines
10 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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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() -- mape 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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ssl() -- secure socket layer support (only available if configured)
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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
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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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_have_ssl = False
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try:
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import _ssl
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from _ssl import *
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_have_ssl = True
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except ImportError:
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pass
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import os, sys, io
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try:
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from errno import EBADF
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except ImportError:
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EBADF = 9
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__all__ = ["getfqdn"]
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__all__.extend(os._get_exports_list(_socket))
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if _have_ssl:
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__all__.extend(os._get_exports_list(_ssl))
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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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# True if os.dup() can duplicate socket descriptors.
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# (On Windows at least, os.dup only works on files)
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_can_dup_socket = hasattr(_socket.socket, "dup")
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if _can_dup_socket:
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def fromfd(fd, family=AF_INET, type=SOCK_STREAM, proto=0):
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nfd = os.dup(fd)
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return socket(family, type, proto, fileno=nfd)
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class SocketCloser:
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"""Helper to manage socket close() logic for makefile().
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The OS socket should not be closed until the socket and all
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of its makefile-children are closed. If the refcount is zero
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when socket.close() is called, this is easy: Just close the
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socket. If the refcount is non-zero when socket.close() is
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called, then the real close should not occur until the last
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makefile-child is closed.
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"""
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def __init__(self, sock):
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self._sock = sock
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self._makefile_refs = 0
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# Test whether the socket is open.
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try:
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sock.fileno()
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self._socket_open = True
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except error:
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self._socket_open = False
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def socket_close(self):
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self._socket_open = False
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self.close()
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def makefile_open(self):
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self._makefile_refs += 1
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def makefile_close(self):
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self._makefile_refs -= 1
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self.close()
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def close(self):
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if not (self._socket_open or self._makefile_refs):
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self._sock._real_close()
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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__", "_closer"]
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if not _can_dup_socket:
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__slots__.append("_base")
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def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None):
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if fileno is None:
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_socket.socket.__init__(self, family, type, proto)
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else:
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_socket.socket.__init__(self, family, type, proto, fileno)
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# Defer creating a SocketCloser until makefile() is actually called.
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self._closer = None
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def __repr__(self):
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"""Wrap __repr__() to reveal the real class name."""
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s = _socket.socket.__repr__(self)
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if s.startswith("<socket object"):
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s = "<%s.%s%s" % (self.__class__.__module__,
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self.__class__.__name__,
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s[7:])
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return s
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def accept(self):
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"""Wrap accept() to give the connection the right type."""
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conn, addr = _socket.socket.accept(self)
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fd = conn.fileno()
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nfd = fd
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if _can_dup_socket:
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nfd = os.dup(fd)
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wrapper = socket(self.family, self.type, self.proto, fileno=nfd)
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if fd == nfd:
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wrapper._base = conn # Keep the base alive
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else:
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conn.close()
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return wrapper, addr
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def makefile(self, mode="r", buffering=None, *,
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encoding=None, newline=None):
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"""Return 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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if self._closer is None:
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self._closer = SocketCloser(self)
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raw = SocketIO(self, rawmode, self._closer)
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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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raw.name = self.fileno()
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raw.mode = mode
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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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buffer.name = self.fileno()
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buffer.mode = mode
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return buffer
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text = io.TextIOWrapper(buffer, encoding, newline)
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text.name = self.fileno()
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text.mode = mode
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return text
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def close(self):
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if self._closer is None:
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self._real_close()
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else:
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self._closer.socket_close()
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# _real_close calls close on the _socket.socket base class.
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if not _can_dup_socket:
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def _real_close(self):
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_socket.socket.close(self)
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base = getattr(self, "_base", None)
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if base is not None:
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self._base = None
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base.close()
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else:
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def _real_close(self):
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_socket.socket.close(self)
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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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# XXX More docs
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def __init__(self, sock, mode, closer):
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assert mode in ("r", "w", "rw")
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io.RawIOBase.__init__(self)
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self._sock = sock
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self._mode = mode
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self._closer = closer
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closer.makefile_open()
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def readinto(self, b):
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return self._sock.recv_into(b)
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def write(self, b):
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return self._sock.send(b)
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def readable(self):
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return "r" in self._mode
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def writable(self):
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return "w" in self._mode
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def fileno(self):
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return self._sock.fileno()
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def close(self):
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if self.closed:
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return
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self._closer.makefile_close()
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io.RawIOBase.close(self)
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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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def create_connection(address, timeout=None):
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"""Connect to address (host, port) with an optional timeout.
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Provides access to socketobject timeout for higher-level
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protocols. Passing a timeout will set the timeout on the
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socket instance (if not present, or passed as None, the
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default global timeout setting will be used).
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"""
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msg = "getaddrinfo returns an empty list"
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host, port = address
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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 None:
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sock.settimeout(timeout)
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sock.connect(sa)
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return sock
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except error as err:
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msg = err
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if sock is not None:
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sock.close()
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raise error(msg)
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