# 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 [*] 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 [*] 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: from errno import EBADF except ImportError: EBADF = 9 __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 __repr__(self): """Wrap __repr__() to reveal the real class name.""" s = _socket.socket.__repr__(self) if s.startswith(" socket object Return a new socket object connected to the same system resource. """ 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() return socket(self.family, self.type, self.proto, fileno=fd), 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): _socket.socket.close(self) def close(self): self._closed = True if self._io_refs <= 0: self._real_close() 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) 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 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() return self._sock.recv_into(b) 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() return self._sock.send(b) def readable(self): """True if the SocketIO is open for reading. """ return self._reading and not self.closed def writable(self): """True if the SocketIO is open for writing. """ return self._writing and not self.closed def fileno(self): """Return the file descriptor of the underlying socket. """ self._checkClosed() return self._sock.fileno() @property def name(self): return self.fileno() @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 __del__(self): if not self.closed: self._sock._decref_socketios() 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): """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. """ 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) 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")