1 # Wrapper module for _socket, providing some additional facilities
2 # implemented in Python.
5 This module provides socket operations and some related functions.
6 On Unix, it supports IP (Internet Protocol) and Unix domain sockets.
7 On other systems, it only supports IP. Functions specific for a
8 socket are available as methods of the socket object.
12 socket() -- create a new socket object
13 socketpair() -- create a pair of new socket objects [*]
14 fromfd() -- create a socket object from an open file descriptor [*]
15 gethostname() -- return the current hostname
16 gethostbyname() -- map a hostname to its IP number
17 gethostbyaddr() -- map an IP number or hostname to DNS info
18 getservbyname() -- map a service name and a protocol name to a port number
19 getprotobyname() -- mape a protocol name (e.g. 'tcp') to a number
20 ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order
21 htons(), htonl() -- convert 16, 32 bit int from host to network byte order
22 inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format
23 inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89)
24 ssl() -- secure socket layer support (only available if configured)
25 socket.getdefaulttimeout() -- get the default timeout value
26 socket.setdefaulttimeout() -- set the default timeout value
28 [*] not available on all platforms!
32 SocketType -- type object for socket objects
33 error -- exception raised for I/O errors
34 has_ipv6 -- boolean value indicating if IPv6 is supported
38 AF_INET, AF_UNIX -- socket domains (first argument to socket() call)
39 SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument)
41 Many other constants may be defined; these may be used in calls to
42 the setsockopt() and getsockopt() methods.
59 from errno import EBADF
64 __all__.extend(os._get_exports_list(_socket))
66 __all__.extend(os._get_exports_list(_ssl))
71 def ssl(sock, keyfile=None, certfile=None):
72 if hasattr(sock, "_sock"):
74 return _realssl(sock, keyfile, certfile)
77 if sys.platform.lower().startswith("win"):
79 errorTab[10004] = "The operation was interrupted."
80 errorTab[10009] = "A bad file handle was passed."
81 errorTab[10013] = "Permission denied."
82 errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT
83 errorTab[10022] = "An invalid operation was attempted."
84 errorTab[10035] = "The socket operation would block"
85 errorTab[10036] = "A blocking operation is already in progress."
86 errorTab[10048] = "The network address is in use."
87 errorTab[10054] = "The connection has been reset."
88 errorTab[10058] = "The network has been shut down."
89 errorTab[10060] = "The operation timed out."
90 errorTab[10061] = "Connection refused."
91 errorTab[10063] = "The name is too long."
92 errorTab[10064] = "The host is down."
93 errorTab[10065] = "The host is unreachable."
94 __all__.append("errorTab")
99 """Get fully qualified domain name from name.
101 An empty argument is interpreted as meaning the local host.
103 First the hostname returned by gethostbyaddr() is checked, then
104 possibly existing aliases. In case no FQDN is available, hostname
105 from gethostname() is returned.
108 if not name or name == '0.0.0.0':
111 hostname, aliases, ipaddrs = gethostbyaddr(name)
115 aliases.insert(0, hostname)
125 'bind', 'connect', 'connect_ex', 'fileno', 'listen',
126 'getpeername', 'getsockname', 'getsockopt', 'setsockopt',
127 'sendall', 'setblocking',
128 'settimeout', 'gettimeout', 'shutdown')
130 if sys.platform == "riscos":
131 _socketmethods = _socketmethods + ('sleeptaskw',)
133 # All the method names that must be delegated to either the real socket
134 # object or the _closedsocket object.
135 _delegate_methods = ("recv", "recvfrom", "recv_into", "recvfrom_into",
138 class _closedsocket(object):
141 raise error(EBADF, 'Bad file descriptor')
142 # All _delegate_methods must also be initialized here.
143 send = recv = recv_into = sendto = recvfrom = recvfrom_into = _dummy
146 class _socketobject(object):
148 __doc__ = _realsocket.__doc__
150 __slots__ = ["_sock", "__weakref__"] + list(_delegate_methods)
152 def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, _sock=None):
154 _sock = _realsocket(family, type, proto)
156 for method in _delegate_methods:
157 setattr(self, method, getattr(_sock, method))
160 self._sock = _closedsocket()
161 dummy = self._sock._dummy
162 for method in _delegate_methods:
163 setattr(self, method, dummy)
164 close.__doc__ = _realsocket.close.__doc__
167 sock, addr = self._sock.accept()
168 return _socketobject(_sock=sock), addr
169 accept.__doc__ = _realsocket.accept.__doc__
172 """dup() -> socket object
174 Return a new socket object connected to the same system resource."""
175 return _socketobject(_sock=self._sock)
177 def makefile(self, mode='r', bufsize=-1):
178 """makefile([mode[, bufsize]]) -> file object
180 Return a regular file object corresponding to the socket. The mode
181 and bufsize arguments are as for the built-in open() function."""
182 return _fileobject(self._sock, mode, bufsize)
184 family = property(lambda self: self._sock.family, doc="the socket family")
185 type = property(lambda self: self._sock.type, doc="the socket type")
186 proto = property(lambda self: self._sock.proto, doc="the socket protocol")
188 _s = ("def %s(self, *args): return self._sock.%s(*args)\n\n"
189 "%s.__doc__ = _realsocket.%s.__doc__\n")
190 for _m in _socketmethods:
191 exec _s % (_m, _m, _m, _m)
194 socket = SocketType = _socketobject
196 class _fileobject(object):
197 """Faux file object attached to a socket object."""
199 default_bufsize = 8192
202 __slots__ = ["mode", "bufsize", "softspace",
203 # "closed" is a property, see below
204 "_sock", "_rbufsize", "_wbufsize", "_rbuf", "_wbuf",
207 def __init__(self, sock, mode='rb', bufsize=-1, close=False):
209 self.mode = mode # Not actually used in this version
211 bufsize = self.default_bufsize
212 self.bufsize = bufsize
213 self.softspace = False
217 self._rbufsize = self.default_bufsize
219 self._rbufsize = bufsize
220 self._wbufsize = bufsize
221 self._rbuf = "" # A string
222 self._wbuf = [] # A list of strings
225 def _getclosed(self):
226 return self._sock is None
227 closed = property(_getclosed, doc="True if the file is closed")
242 # close() may fail if __init__ didn't complete
247 buffer = "".join(self._wbuf)
249 self._sock.sendall(buffer)
252 return self._sock.fileno()
254 def write(self, data):
255 data = str(data) # XXX Should really reject non-string non-buffers
258 self._wbuf.append(data)
259 if (self._wbufsize == 0 or
260 self._wbufsize == 1 and '\n' in data or
261 self._get_wbuf_len() >= self._wbufsize):
264 def writelines(self, list):
265 # XXX We could do better here for very long lists
266 # XXX Should really reject non-string non-buffers
267 self._wbuf.extend(filter(None, map(str, list)))
268 if (self._wbufsize <= 1 or
269 self._get_wbuf_len() >= self._wbufsize):
272 def _get_wbuf_len(self):
278 def read(self, size=-1):
286 if self._rbufsize <= 1:
287 recv_size = self.default_bufsize
289 recv_size = self._rbufsize
291 data = self._sock.recv(recv_size)
295 return "".join(buffers)
297 # Read until size bytes or EOF seen, whichever comes first
300 self._rbuf = data[size:]
307 left = size - buf_len
308 recv_size = max(self._rbufsize, left)
309 data = self._sock.recv(recv_size)
315 self._rbuf = data[left:]
316 buffers[-1] = data[:left]
319 return "".join(buffers)
321 def readline(self, size=-1):
324 # Read until \n or EOF, whichever comes first
325 if self._rbufsize <= 1:
326 # Speed up unbuffered case
329 recv = self._sock.recv
335 return "".join(buffers)
339 self._rbuf = data[nl:]
346 data = self._sock.recv(self._rbufsize)
353 self._rbuf = data[nl:]
354 buffers[-1] = data[:nl]
356 return "".join(buffers)
358 # Read until size bytes or \n or EOF seen, whichever comes first
359 nl = data.find('\n', 0, size)
362 self._rbuf = data[nl:]
366 self._rbuf = data[size:]
373 data = self._sock.recv(self._rbufsize)
377 left = size - buf_len
378 nl = data.find('\n', 0, left)
381 self._rbuf = data[nl:]
382 buffers[-1] = data[:nl]
386 self._rbuf = data[left:]
387 buffers[-1] = data[:left]
390 return "".join(buffers)
392 def readlines(self, sizehint=0):
396 line = self.readline()
401 if sizehint and total >= sizehint:
411 line = self.readline()