# 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
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 *

try:
 import _ssl
except ImportError:
 # no SSL support
 pass
else:
 def ssl(sock, keyfile=None, certfile=None):
 # we do an internal import here because the ssl
 # module imports the socket module
 import ssl as _realssl
 warnings.warn("socket.ssl() is deprecated. Use ssl.wrap_socket() instead.",
 DeprecationWarning, stacklevel=2)
 return _realssl.sslwrap_simple(sock, keyfile, certfile)

 # we need to import the same constants we used to...
 from _ssl import SSLError as sslerror
 from _ssl import \
 RAND_add, \
 RAND_egd, \
 RAND_status, \
 SSL_ERROR_ZERO_RETURN, \
 SSL_ERROR_WANT_READ, \
 SSL_ERROR_WANT_WRITE, \
 SSL_ERROR_WANT_X509_LOOKUP, \
 SSL_ERROR_SYSCALL, \
 SSL_ERROR_SSL, \
 SSL_ERROR_WANT_CONNECT, \
 SSL_ERROR_EOF, \
 SSL_ERROR_INVALID_ERROR_CODE

import os, sys, warnings

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))


_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")



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 os.name == "nt":
 _socketmethods = _socketmethods + ('ioctl',)

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

# Wrapper around platform socket objects. This implements
# a platform-independent dup() functionality. The
# implementation currently relies on reference counting
# to close the underlying socket object.
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(data[:nl])
 self._rbuf.write(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(data[nl:])
 if buf_len:
 buf.write(data[: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(data[:left])
 self._rbuf.write(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

_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.
 """

 msg = "getaddrinfo returns an empty list"
 host, port = address
 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, msg:
 if sock is not None:
 sock.close()

 raise error, msg