573 lines
20 KiB
Python
573 lines
20 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() -- 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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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 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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from functools import partial
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from types import MethodType
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try:
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import _ssl
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except ImportError:
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# no SSL support
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pass
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else:
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def ssl(sock, keyfile=None, certfile=None):
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# we do an internal import here because the ssl
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# module imports the socket module
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import ssl as _realssl
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warnings.warn("socket.ssl() is deprecated. Use ssl.wrap_socket() instead.",
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DeprecationWarning, stacklevel=2)
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return _realssl.sslwrap_simple(sock, keyfile, certfile)
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# we need to import the same constants we used to...
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from _ssl import SSLError as sslerror
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from _ssl import \
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RAND_add, \
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RAND_egd, \
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RAND_status, \
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SSL_ERROR_ZERO_RETURN, \
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SSL_ERROR_WANT_READ, \
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SSL_ERROR_WANT_WRITE, \
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SSL_ERROR_WANT_X509_LOOKUP, \
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SSL_ERROR_SYSCALL, \
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SSL_ERROR_SSL, \
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SSL_ERROR_WANT_CONNECT, \
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SSL_ERROR_EOF, \
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SSL_ERROR_INVALID_ERROR_CODE
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import os, sys, warnings
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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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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EINTR = getattr(errno, 'EINTR', 4)
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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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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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_socketmethods = (
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'bind', 'connect', 'connect_ex', 'fileno', 'listen',
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'getpeername', 'getsockname', 'getsockopt', 'setsockopt',
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'sendall', 'setblocking',
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'settimeout', 'gettimeout', 'shutdown')
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if os.name == "nt":
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_socketmethods = _socketmethods + ('ioctl',)
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if sys.platform == "riscos":
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_socketmethods = _socketmethods + ('sleeptaskw',)
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# All the method names that must be delegated to either the real socket
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# object or the _closedsocket object.
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_delegate_methods = ("recv", "recvfrom", "recv_into", "recvfrom_into",
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"send", "sendto")
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class _closedsocket(object):
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__slots__ = []
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def _dummy(*args):
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raise error(EBADF, 'Bad file descriptor')
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# All _delegate_methods must also be initialized here.
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send = recv = recv_into = sendto = recvfrom = recvfrom_into = _dummy
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__getattr__ = _dummy
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# Wrapper around platform socket objects. This implements
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# a platform-independent dup() functionality. The
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# implementation currently relies on reference counting
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# to close the underlying socket object.
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class _socketobject(object):
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__doc__ = _realsocket.__doc__
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__slots__ = ["_sock", "__weakref__"] + list(_delegate_methods)
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def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, _sock=None):
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if _sock is None:
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_sock = _realsocket(family, type, proto)
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self._sock = _sock
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for method in _delegate_methods:
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setattr(self, method, getattr(_sock, method))
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def close(self, _closedsocket=_closedsocket,
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_delegate_methods=_delegate_methods, setattr=setattr):
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# This function should not reference any globals. See issue #808164.
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self._sock = _closedsocket()
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dummy = self._sock._dummy
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for method in _delegate_methods:
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setattr(self, method, dummy)
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close.__doc__ = _realsocket.close.__doc__
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def accept(self):
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sock, addr = self._sock.accept()
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return _socketobject(_sock=sock), addr
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accept.__doc__ = _realsocket.accept.__doc__
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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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return _socketobject(_sock=self._sock)
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def makefile(self, mode='r', bufsize=-1):
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"""makefile([mode[, bufsize]]) -> file object
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Return a regular file object corresponding to the socket. The mode
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and bufsize arguments are as for the built-in open() function."""
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return _fileobject(self._sock, mode, bufsize)
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family = property(lambda self: self._sock.family, doc="the socket family")
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type = property(lambda self: self._sock.type, doc="the socket type")
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proto = property(lambda self: self._sock.proto, doc="the socket protocol")
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def meth(name,self,*args):
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return getattr(self._sock,name)(*args)
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for _m in _socketmethods:
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p = partial(meth,_m)
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p.__name__ = _m
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p.__doc__ = getattr(_realsocket,_m).__doc__
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m = MethodType(p,None,_socketobject)
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setattr(_socketobject,_m,m)
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socket = SocketType = _socketobject
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class _fileobject(object):
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"""Faux file object attached to a socket object."""
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default_bufsize = 8192
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name = "<socket>"
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__slots__ = ["mode", "bufsize", "softspace",
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# "closed" is a property, see below
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"_sock", "_rbufsize", "_wbufsize", "_rbuf", "_wbuf", "_wbuf_len",
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"_close"]
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def __init__(self, sock, mode='rb', bufsize=-1, close=False):
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self._sock = sock
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self.mode = mode # Not actually used in this version
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if bufsize < 0:
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bufsize = self.default_bufsize
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self.bufsize = bufsize
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self.softspace = False
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# _rbufsize is the suggested recv buffer size. It is *strictly*
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# obeyed within readline() for recv calls. If it is larger than
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# default_bufsize it will be used for recv calls within read().
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if bufsize == 0:
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self._rbufsize = 1
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elif bufsize == 1:
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self._rbufsize = self.default_bufsize
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else:
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self._rbufsize = bufsize
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self._wbufsize = bufsize
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# We use StringIO for the read buffer to avoid holding a list
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# of variously sized string objects which have been known to
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# fragment the heap due to how they are malloc()ed and often
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# realloc()ed down much smaller than their original allocation.
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self._rbuf = StringIO()
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self._wbuf = [] # A list of strings
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self._wbuf_len = 0
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self._close = close
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def _getclosed(self):
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return self._sock is None
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closed = property(_getclosed, doc="True if the file is closed")
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def close(self):
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try:
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if self._sock:
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self.flush()
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finally:
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if self._close:
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self._sock.close()
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self._sock = None
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def __del__(self):
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try:
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self.close()
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except:
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# close() may fail if __init__ didn't complete
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pass
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def flush(self):
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if self._wbuf:
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data = "".join(self._wbuf)
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self._wbuf = []
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self._wbuf_len = 0
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buffer_size = max(self._rbufsize, self.default_bufsize)
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data_size = len(data)
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write_offset = 0
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view = memoryview(data)
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try:
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while write_offset < data_size:
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self._sock.sendall(view[write_offset:write_offset+buffer_size])
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write_offset += buffer_size
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finally:
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if write_offset < data_size:
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remainder = data[write_offset:]
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del view, data # explicit free
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self._wbuf.append(remainder)
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self._wbuf_len = len(remainder)
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def fileno(self):
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return self._sock.fileno()
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def write(self, data):
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data = str(data) # XXX Should really reject non-string non-buffers
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if not data:
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return
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self._wbuf.append(data)
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self._wbuf_len += len(data)
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if (self._wbufsize == 0 or
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(self._wbufsize == 1 and '\n' in data) or
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(self._wbufsize > 1 and self._wbuf_len >= self._wbufsize)):
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self.flush()
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def writelines(self, list):
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# XXX We could do better here for very long lists
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# XXX Should really reject non-string non-buffers
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lines = filter(None, map(str, list))
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self._wbuf_len += sum(map(len, lines))
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self._wbuf.extend(lines)
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if (self._wbufsize <= 1 or
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self._wbuf_len >= self._wbufsize):
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self.flush()
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def read(self, size=-1):
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# Use max, disallow tiny reads in a loop as they are very inefficient.
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# We never leave read() with any leftover data from a new recv() call
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# in our internal buffer.
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rbufsize = max(self._rbufsize, self.default_bufsize)
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# Our use of StringIO rather than lists of string objects returned by
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# recv() minimizes memory usage and fragmentation that occurs when
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# rbufsize is large compared to the typical return value of recv().
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buf = self._rbuf
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buf.seek(0, 2) # seek end
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if size < 0:
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# Read until EOF
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self._rbuf = StringIO() # reset _rbuf. we consume it via buf.
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while True:
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try:
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data = self._sock.recv(rbufsize)
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except error, e:
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if e.args[0] == EINTR:
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continue
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raise
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if not data:
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break
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buf.write(data)
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return buf.getvalue()
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else:
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# Read until size bytes or EOF seen, whichever comes first
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buf_len = buf.tell()
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if buf_len >= size:
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# Already have size bytes in our buffer? Extract and return.
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buf.seek(0)
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rv = buf.read(size)
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self._rbuf = StringIO()
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self._rbuf.write(buf.read())
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return rv
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self._rbuf = StringIO() # reset _rbuf. we consume it via buf.
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while True:
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left = size - buf_len
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# recv() will malloc the amount of memory given as its
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# parameter even though it often returns much less data
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# than that. The returned data string is short lived
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# as we copy it into a StringIO and free it. This avoids
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# fragmentation issues on many platforms.
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try:
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data = self._sock.recv(left)
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except error, e:
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if e.args[0] == EINTR:
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continue
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raise
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if not data:
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break
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n = len(data)
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if n == size and not buf_len:
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# Shortcut. Avoid buffer data copies when:
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# - We have no data in our buffer.
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# AND
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# - Our call to recv returned exactly the
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# number of bytes we were asked to read.
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return data
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if n == left:
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buf.write(data)
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del data # explicit free
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break
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assert n <= left, "recv(%d) returned %d bytes" % (left, n)
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buf.write(data)
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buf_len += n
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del data # explicit free
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#assert buf_len == buf.tell()
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return buf.getvalue()
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def readline(self, size=-1):
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buf = self._rbuf
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buf.seek(0, 2) # seek end
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if buf.tell() > 0:
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# check if we already have it in our buffer
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buf.seek(0)
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bline = buf.readline(size)
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if bline.endswith('\n') or len(bline) == size:
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self._rbuf = StringIO()
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self._rbuf.write(buf.read())
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return bline
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del bline
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if size < 0:
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# Read until \n or EOF, whichever comes first
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if self._rbufsize <= 1:
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# Speed up unbuffered case
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buf.seek(0)
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buffers = [buf.read()]
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self._rbuf = StringIO() # reset _rbuf. we consume it via buf.
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data = None
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recv = self._sock.recv
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while True:
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try:
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while data != "\n":
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data = recv(1)
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if not data:
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break
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buffers.append(data)
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except error, e:
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# The try..except to catch EINTR was moved outside the
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# recv loop to avoid the per byte overhead.
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if e.args[0] == EINTR:
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continue
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raise
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break
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return "".join(buffers)
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buf.seek(0, 2) # seek end
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self._rbuf = StringIO() # reset _rbuf. we consume it via buf.
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while True:
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try:
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data = self._sock.recv(self._rbufsize)
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except error, e:
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if e.args[0] == EINTR:
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continue
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raise
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if not data:
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break
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nl = data.find('\n')
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if nl >= 0:
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nl += 1
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buf.write(data[:nl])
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self._rbuf.write(data[nl:])
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del data
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break
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buf.write(data)
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return buf.getvalue()
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else:
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# Read until size bytes or \n or EOF seen, whichever comes first
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buf.seek(0, 2) # seek end
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buf_len = buf.tell()
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if buf_len >= size:
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buf.seek(0)
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rv = buf.read(size)
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self._rbuf = StringIO()
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self._rbuf.write(buf.read())
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return rv
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self._rbuf = StringIO() # reset _rbuf. we consume it via buf.
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while True:
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try:
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data = self._sock.recv(self._rbufsize)
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except error, e:
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if e.args[0] == EINTR:
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continue
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raise
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if not data:
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break
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left = size - buf_len
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# did we just receive a newline?
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nl = data.find('\n', 0, left)
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if nl >= 0:
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nl += 1
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# save the excess data to _rbuf
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self._rbuf.write(data[nl:])
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if buf_len:
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buf.write(data[:nl])
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break
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else:
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# Shortcut. Avoid data copy through buf when returning
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# a substring of our first recv().
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return data[:nl]
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n = len(data)
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if n == size and not buf_len:
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# Shortcut. Avoid data copy through buf when
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# returning exactly all of our first recv().
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return data
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if n >= left:
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buf.write(data[:left])
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self._rbuf.write(data[left:])
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break
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buf.write(data)
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buf_len += n
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#assert buf_len == buf.tell()
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return buf.getvalue()
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def readlines(self, sizehint=0):
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total = 0
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list = []
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while True:
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line = self.readline()
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if not line:
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break
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list.append(line)
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total += len(line)
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if sizehint and total >= sizehint:
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break
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return list
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# Iterator protocols
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def __iter__(self):
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return self
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def next(self):
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line = self.readline()
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if not line:
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raise StopIteration
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return line
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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)
|
|
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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|
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except error as _:
|
|
err = _
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if sock is not None:
|
|
sock.close()
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|
|
if err is not None:
|
|
raise err
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else:
|
|
raise error("getaddrinfo returns an empty list")
|