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