Source

cpython-withatomic / Lib / socket.py

The branch '2.5' does not exist.
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
# 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() -- mape 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)
ssl() -- secure socket layer support (only available if configured)
socket.getdefaulttimeout() -- get the default timeout value
socket.setdefaulttimeout() -- set the default timeout value

 [*] 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 *

_have_ssl = False
try:
    import _ssl
    from _ssl import *
    _have_ssl = True
except ImportError:
    pass

import os, sys

try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO

try:
    from errno import EBADF
except ImportError:
    EBADF = 9

__all__ = ["getfqdn"]
__all__.extend(os._get_exports_list(_socket))
if _have_ssl:
    __all__.extend(os._get_exports_list(_ssl))

_realsocket = socket
if _have_ssl:
    _realssl = ssl
    def ssl(sock, keyfile=None, certfile=None):
        if hasattr(sock, "_sock"):
            sock = sock._sock
        return _realssl(sock, keyfile, certfile)

# 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")



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


_socketmethods = (
    'bind', 'connect', 'connect_ex', 'fileno', 'listen',
    'getpeername', 'getsockname', 'getsockopt', 'setsockopt',
    'sendall', 'setblocking',
    'settimeout', 'gettimeout', 'shutdown')

if sys.platform == "riscos":
    _socketmethods = _socketmethods + ('sleeptaskw',)

# All the method names that must be delegated to either the real socket
# object or the _closedsocket object.
_delegate_methods = ("recv", "recvfrom", "recv_into", "recvfrom_into",
                     "send", "sendto")

class _closedsocket(object):
    __slots__ = []
    def _dummy(*args):
        raise error(EBADF, 'Bad file descriptor')
    # All _delegate_methods must also be initialized here.
    send = recv = recv_into = sendto = recvfrom = recvfrom_into = _dummy
    __getattr__ = _dummy

class _socketobject(object):

    __doc__ = _realsocket.__doc__

    __slots__ = ["_sock", "__weakref__"] + list(_delegate_methods)

    def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, _sock=None):
        if _sock is None:
            _sock = _realsocket(family, type, proto)
        self._sock = _sock
        for method in _delegate_methods:
            setattr(self, method, getattr(_sock, method))

    def close(self):
        self._sock = _closedsocket()
        dummy = self._sock._dummy
        for method in _delegate_methods:
            setattr(self, method, dummy)
    close.__doc__ = _realsocket.close.__doc__

    def accept(self):
        sock, addr = self._sock.accept()
        return _socketobject(_sock=sock), addr
    accept.__doc__ = _realsocket.accept.__doc__

    def dup(self):
        """dup() -> socket object

        Return a new socket object connected to the same system resource."""
        return _socketobject(_sock=self._sock)

    def makefile(self, mode='r', bufsize=-1):
        """makefile([mode[, bufsize]]) -> file object

        Return a regular file object corresponding to the socket.  The mode
        and bufsize arguments are as for the built-in open() function."""
        return _fileobject(self._sock, mode, bufsize)

    family = property(lambda self: self._sock.family, doc="the socket family")
    type = property(lambda self: self._sock.type, doc="the socket type")
    proto = property(lambda self: self._sock.proto, doc="the socket protocol")

    _s = ("def %s(self, *args): return self._sock.%s(*args)\n\n"
          "%s.__doc__ = _realsocket.%s.__doc__\n")
    for _m in _socketmethods:
        exec _s % (_m, _m, _m, _m)
    del _m, _s

socket = SocketType = _socketobject

class _fileobject(object):
    """Faux file object attached to a socket object."""

    default_bufsize = 8192
    name = "<socket>"

    __slots__ = ["mode", "bufsize", "softspace",
                 # "closed" is a property, see below
                 "_sock", "_rbufsize", "_wbufsize", "_rbuf", "_wbuf",
                 "_close"]

    def __init__(self, sock, mode='rb', bufsize=-1, close=False):
        self._sock = sock
        self.mode = mode # Not actually used in this version
        if bufsize < 0:
            bufsize = self.default_bufsize
        self.bufsize = bufsize
        self.softspace = False
        # _rbufsize is the suggested recv buffer size.  It is *strictly*
        # obeyed within readline() for recv calls.  If it is larger than
        # default_bufsize it will be used for recv calls within read().
        if bufsize == 0:
            self._rbufsize = 1
        elif bufsize == 1:
            self._rbufsize = self.default_bufsize
        else:
            self._rbufsize = bufsize
        self._wbufsize = bufsize
        # We use StringIO for the read buffer to avoid holding a list
        # of variously sized string objects which have been known to
        # fragment the heap due to how they are malloc()ed and often
        # realloc()ed down much smaller than their original allocation.
        self._rbuf = StringIO()
        self._wbuf = [] # A list of strings
        self._close = close

    def _getclosed(self):
        return self._sock is None
    closed = property(_getclosed, doc="True if the file is closed")

    def close(self):
        try:
            if self._sock:
                self.flush()
        finally:
            if self._close:
                self._sock.close()
            self._sock = None

    def __del__(self):
        try:
            self.close()
        except:
            # close() may fail if __init__ didn't complete
            pass

    def flush(self):
        if self._wbuf:
            buffer = "".join(self._wbuf)
            self._wbuf = []
            self._sock.sendall(buffer)

    def fileno(self):
        return self._sock.fileno()

    def write(self, data):
        data = str(data) # XXX Should really reject non-string non-buffers
        if not data:
            return
        self._wbuf.append(data)
        if (self._wbufsize == 0 or
            self._wbufsize == 1 and '\n' in data or
            self._get_wbuf_len() >= self._wbufsize):
            self.flush()

    def writelines(self, list):
        # XXX We could do better here for very long lists
        # XXX Should really reject non-string non-buffers
        self._wbuf.extend(filter(None, map(str, list)))
        if (self._wbufsize <= 1 or
            self._get_wbuf_len() >= self._wbufsize):
            self.flush()

    def _get_wbuf_len(self):
        buf_len = 0
        for x in self._wbuf:
            buf_len += len(x)
        return buf_len

    def read(self, size=-1):
        # Use max, disallow tiny reads in a loop as they are very inefficient.
        # We never leave read() with any leftover data from a new recv() call
        # in our internal buffer.
        rbufsize = max(self._rbufsize, self.default_bufsize)
        # Our use of StringIO rather than lists of string objects returned by
        # recv() minimizes memory usage and fragmentation that occurs when
        # rbufsize is large compared to the typical return value of recv().
        buf = self._rbuf
        buf.seek(0, 2)  # seek end
        if size < 0:
            # Read until EOF
            self._rbuf = StringIO()  # reset _rbuf.  we consume it via buf.
            while True:
                data = self._sock.recv(rbufsize)
                if not data:
                    break
                buf.write(data)
            return buf.getvalue()
        else:
            # Read until size bytes or EOF seen, whichever comes first
            buf_len = buf.tell()
            if buf_len >= size:
                # Already have size bytes in our buffer?  Extract and return.
                buf.seek(0)
                rv = buf.read(size)
                self._rbuf = StringIO()
                self._rbuf.write(buf.read())
                return rv

            self._rbuf = StringIO()  # reset _rbuf.  we consume it via buf.
            while True:
                left = size - buf_len
                # recv() will malloc the amount of memory given as its
                # parameter even though it often returns much less data
                # than that.  The returned data string is short lived
                # as we copy it into a StringIO and free it.  This avoids
                # fragmentation issues on many platforms.
                data = self._sock.recv(left)
                if not data:
                    break
                n = len(data)
                if n == size and not buf_len:
                    # Shortcut.  Avoid buffer data copies when:
                    # - We have no data in our buffer.
                    # AND
                    # - Our call to recv returned exactly the
                    #   number of bytes we were asked to read.
                    return data
                if n == left:
                    buf.write(data)
                    del data  # explicit free
                    break
                assert n <= left, "recv(%d) returned %d bytes" % (left, n)
                buf.write(data)
                buf_len += n
                del data  # explicit free
                #assert buf_len == buf.tell()
            return buf.getvalue()

    def readline(self, size=-1):
        buf = self._rbuf
        buf.seek(0, 2)  # seek end
        if buf.tell() > 0:
            # check if we already have it in our buffer
            buf.seek(0)
            bline = buf.readline(size)
            if bline.endswith('\n') or len(bline) == size:
                self._rbuf = StringIO()
                self._rbuf.write(buf.read())
                return bline
            del bline
        if size < 0:
            # Read until \n or EOF, whichever comes first
            if self._rbufsize <= 1:
                # Speed up unbuffered case
                buf.seek(0)
                buffers = [buf.read()]
                self._rbuf = StringIO()  # reset _rbuf.  we consume it via buf.
                data = None
                recv = self._sock.recv
                while data != "\n":
                    data = recv(1)
                    if not data:
                        break
                    buffers.append(data)
                return "".join(buffers)

            buf.seek(0, 2)  # seek end
            self._rbuf = StringIO()  # reset _rbuf.  we consume it via buf.
            while True:
                data = self._sock.recv(self._rbufsize)
                if not data:
                    break
                nl = data.find('\n')
                if nl >= 0:
                    nl += 1
                    buf.write(buffer(data, 0, nl))
                    self._rbuf.write(buffer(data, nl))
                    del data
                    break
                buf.write(data)
            return buf.getvalue()
        else:
            # Read until size bytes or \n or EOF seen, whichever comes first
            buf.seek(0, 2)  # seek end
            buf_len = buf.tell()
            if buf_len >= size:
                buf.seek(0)
                rv = buf.read(size)
                self._rbuf = StringIO()
                self._rbuf.write(buf.read())
                return rv
            self._rbuf = StringIO()  # reset _rbuf.  we consume it via buf.
            while True:
                data = self._sock.recv(self._rbufsize)
                if not data:
                    break
                left = size - buf_len
                # did we just receive a newline?
                nl = data.find('\n', 0, left)
                if nl >= 0:
                    nl += 1
                    # save the excess data to _rbuf
                    self._rbuf.write(buffer(data, nl))
                    if buf_len:
                        buf.write(buffer(data, 0, nl))
                        break
                    else:
                        # Shortcut.  Avoid data copy through buf when returning
                        # a substring of our first recv().
                        return data[:nl]
                n = len(data)
                if n == size and not buf_len:
                    # Shortcut.  Avoid data copy through buf when
                    # returning exactly all of our first recv().
                    return data
                if n >= left:
                    buf.write(buffer(data, 0, left))
                    self._rbuf.write(buffer(data, left))
                    break
                buf.write(data)
                buf_len += n
                #assert buf_len == buf.tell()
            return buf.getvalue()

    def readlines(self, sizehint=0):
        total = 0
        list = []
        while True:
            line = self.readline()
            if not line:
                break
            list.append(line)
            total += len(line)
            if sizehint and total >= sizehint:
                break
        return list

    # Iterator protocols

    def __iter__(self):
        return self

    def next(self):
        line = self.readline()
        if not line:
            raise StopIteration
        return line