Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 1 | # Wrapper module for _socket, providing some additional facilities |
| 2 | # implemented in Python. |
| 3 | |
| 4 | """\ |
| 5 | This module provides socket operations and some related functions. |
| 6 | On Unix, it supports IP (Internet Protocol) and Unix domain sockets. |
Tim Peters | 495ad3c | 2001-01-15 01:36:40 +0000 | [diff] [blame] | 7 | On other systems, it only supports IP. Functions specific for a |
Martin v. Löwis | af484d5 | 2000-09-30 11:34:30 +0000 | [diff] [blame] | 8 | socket are available as methods of the socket object. |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 9 | |
| 10 | Functions: |
| 11 | |
| 12 | socket() -- create a new socket object |
Dave Cole | 331708b | 2004-08-09 04:51:41 +0000 | [diff] [blame] | 13 | socketpair() -- create a pair of new socket objects [*] |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 14 | fromfd() -- create a socket object from an open file descriptor [*] |
Kristján Valur Jónsson | 10f383a | 2012-04-07 11:23:31 +0000 | [diff] [blame] | 15 | fromshare() -- create a socket object from data received from socket.share() [*] |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 16 | gethostname() -- return the current hostname |
| 17 | gethostbyname() -- map a hostname to its IP number |
| 18 | gethostbyaddr() -- map an IP number or hostname to DNS info |
| 19 | getservbyname() -- map a service name and a protocol name to a port number |
Mark Dickinson | 5c91bf3 | 2009-06-02 07:41:26 +0000 | [diff] [blame] | 20 | getprotobyname() -- map a protocol name (e.g. 'tcp') to a number |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 21 | ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order |
| 22 | htons(), htonl() -- convert 16, 32 bit int from host to network byte order |
| 23 | inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format |
| 24 | inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89) |
Guido van Rossum | 9d0c8ce | 2002-07-18 17:08:35 +0000 | [diff] [blame] | 25 | socket.getdefaulttimeout() -- get the default timeout value |
| 26 | socket.setdefaulttimeout() -- set the default timeout value |
Gregory P. Smith | b406637 | 2010-01-03 03:28:29 +0000 | [diff] [blame] | 27 | create_connection() -- connects to an address, with an optional timeout and |
| 28 | optional source address. |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 29 | |
| 30 | [*] not available on all platforms! |
| 31 | |
| 32 | Special objects: |
| 33 | |
| 34 | SocketType -- type object for socket objects |
| 35 | error -- exception raised for I/O errors |
Guido van Rossum | 47dfa4a | 2003-04-25 05:48:32 +0000 | [diff] [blame] | 36 | has_ipv6 -- boolean value indicating if IPv6 is supported |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 37 | |
Ethan Furman | 7184bac | 2014-10-14 18:56:53 -0700 | [diff] [blame] | 38 | IntEnum constants: |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 39 | |
| 40 | AF_INET, AF_UNIX -- socket domains (first argument to socket() call) |
| 41 | SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument) |
| 42 | |
Ethan Furman | 7184bac | 2014-10-14 18:56:53 -0700 | [diff] [blame] | 43 | Integer constants: |
| 44 | |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 45 | Many other constants may be defined; these may be used in calls to |
| 46 | the setsockopt() and getsockopt() methods. |
| 47 | """ |
| 48 | |
Tim Peters | 18e6778 | 2002-02-17 04:25:24 +0000 | [diff] [blame] | 49 | import _socket |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 50 | from _socket import * |
Tim Peters | 18e6778 | 2002-02-17 04:25:24 +0000 | [diff] [blame] | 51 | |
Giampaolo Rodola' | 915d141 | 2014-06-11 03:54:30 +0200 | [diff] [blame] | 52 | import os, sys, io, selectors |
Ethan Furman | 40bed8a | 2016-09-11 13:34:42 -0700 | [diff] [blame] | 53 | from enum import IntEnum, IntFlag |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 54 | |
Fred Drake | 70d566b | 2003-04-29 19:50:25 +0000 | [diff] [blame] | 55 | try: |
Gregory P. Smith | aafdca8 | 2010-01-04 04:50:36 +0000 | [diff] [blame] | 56 | import errno |
Brett Cannon | cd171c8 | 2013-07-04 17:43:24 -0400 | [diff] [blame] | 57 | except ImportError: |
Gregory P. Smith | aafdca8 | 2010-01-04 04:50:36 +0000 | [diff] [blame] | 58 | errno = None |
| 59 | EBADF = getattr(errno, 'EBADF', 9) |
Antoine Pitrou | 98b4670 | 2010-09-18 22:59:00 +0000 | [diff] [blame] | 60 | EAGAIN = getattr(errno, 'EAGAIN', 11) |
| 61 | EWOULDBLOCK = getattr(errno, 'EWOULDBLOCK', 11) |
Fred Drake | 70d566b | 2003-04-29 19:50:25 +0000 | [diff] [blame] | 62 | |
Giampaolo Rodola | eb7e29f | 2019-04-09 00:34:02 +0200 | [diff] [blame] | 63 | __all__ = ["fromfd", "getfqdn", "create_connection", "create_server", |
| 64 | "has_dualstack_ipv6", "AddressFamily", "SocketKind"] |
Skip Montanaro | 0de6580 | 2001-02-15 22:15:14 +0000 | [diff] [blame] | 65 | __all__.extend(os._get_exports_list(_socket)) |
Thomas Wouters | 47b49bf | 2007-08-30 22:15:33 +0000 | [diff] [blame] | 66 | |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 67 | # Set up the socket.AF_* socket.SOCK_* constants as members of IntEnums for |
| 68 | # nicer string representations. |
| 69 | # Note that _socket only knows about the integer values. The public interface |
| 70 | # in this module understands the enums and translates them back from integers |
| 71 | # where needed (e.g. .family property of a socket object). |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 72 | |
orlnub123 | 0fb9fad | 2018-09-12 20:28:53 +0300 | [diff] [blame] | 73 | IntEnum._convert_( |
Ethan Furman | 24e837f | 2015-03-18 17:27:57 -0700 | [diff] [blame] | 74 | 'AddressFamily', |
| 75 | __name__, |
| 76 | lambda C: C.isupper() and C.startswith('AF_')) |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 77 | |
orlnub123 | 0fb9fad | 2018-09-12 20:28:53 +0300 | [diff] [blame] | 78 | IntEnum._convert_( |
Ethan Furman | 24e837f | 2015-03-18 17:27:57 -0700 | [diff] [blame] | 79 | 'SocketKind', |
| 80 | __name__, |
| 81 | lambda C: C.isupper() and C.startswith('SOCK_')) |
Charles-François Natali | 98c745a | 2014-10-14 21:22:44 +0100 | [diff] [blame] | 82 | |
orlnub123 | 0fb9fad | 2018-09-12 20:28:53 +0300 | [diff] [blame] | 83 | IntFlag._convert_( |
Ethan Furman | 40bed8a | 2016-09-11 13:34:42 -0700 | [diff] [blame] | 84 | 'MsgFlag', |
| 85 | __name__, |
| 86 | lambda C: C.isupper() and C.startswith('MSG_')) |
| 87 | |
orlnub123 | 0fb9fad | 2018-09-12 20:28:53 +0300 | [diff] [blame] | 88 | IntFlag._convert_( |
Ethan Furman | 40bed8a | 2016-09-11 13:34:42 -0700 | [diff] [blame] | 89 | 'AddressInfo', |
| 90 | __name__, |
| 91 | lambda C: C.isupper() and C.startswith('AI_')) |
| 92 | |
Charles-François Natali | 98c745a | 2014-10-14 21:22:44 +0100 | [diff] [blame] | 93 | _LOCALHOST = '127.0.0.1' |
| 94 | _LOCALHOST_V6 = '::1' |
| 95 | |
| 96 | |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 97 | def _intenum_converter(value, enum_klass): |
| 98 | """Convert a numeric family value to an IntEnum member. |
| 99 | |
| 100 | If it's not a known member, return the numeric value itself. |
| 101 | """ |
| 102 | try: |
| 103 | return enum_klass(value) |
| 104 | except ValueError: |
| 105 | return value |
Thomas Wouters | 47b49bf | 2007-08-30 22:15:33 +0000 | [diff] [blame] | 106 | |
| 107 | _realsocket = socket |
Skip Montanaro | 0de6580 | 2001-02-15 22:15:14 +0000 | [diff] [blame] | 108 | |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 109 | # WSA error codes |
| 110 | if sys.platform.lower().startswith("win"): |
| 111 | errorTab = {} |
| 112 | errorTab[10004] = "The operation was interrupted." |
| 113 | errorTab[10009] = "A bad file handle was passed." |
| 114 | errorTab[10013] = "Permission denied." |
| 115 | errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT |
| 116 | errorTab[10022] = "An invalid operation was attempted." |
| 117 | errorTab[10035] = "The socket operation would block" |
| 118 | errorTab[10036] = "A blocking operation is already in progress." |
| 119 | errorTab[10048] = "The network address is in use." |
| 120 | errorTab[10054] = "The connection has been reset." |
| 121 | errorTab[10058] = "The network has been shut down." |
| 122 | errorTab[10060] = "The operation timed out." |
| 123 | errorTab[10061] = "Connection refused." |
| 124 | errorTab[10063] = "The name is too long." |
| 125 | errorTab[10064] = "The host is down." |
| 126 | errorTab[10065] = "The host is unreachable." |
Skip Montanaro | 64de1a4 | 2001-03-18 19:53:21 +0000 | [diff] [blame] | 127 | __all__.append("errorTab") |
Guido van Rossum | de7cade | 2002-08-08 15:25:28 +0000 | [diff] [blame] | 128 | |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 129 | |
Giampaolo Rodola' | 915d141 | 2014-06-11 03:54:30 +0200 | [diff] [blame] | 130 | class _GiveupOnSendfile(Exception): pass |
| 131 | |
| 132 | |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 133 | class socket(_socket.socket): |
| 134 | |
| 135 | """A subclass of _socket.socket adding the makefile() method.""" |
| 136 | |
Guido van Rossum | 86bc33c | 2007-11-14 22:32:02 +0000 | [diff] [blame] | 137 | __slots__ = ["__weakref__", "_io_refs", "_closed"] |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 138 | |
Christian Heimes | b6e43af | 2018-01-29 22:37:58 +0100 | [diff] [blame] | 139 | def __init__(self, family=-1, type=-1, proto=-1, fileno=None): |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 140 | # For user code address family and type values are IntEnum members, but |
| 141 | # for the underlying _socket.socket they're just integers. The |
| 142 | # constructor of _socket.socket converts the given argument to an |
| 143 | # integer automatically. |
Christian Heimes | b6e43af | 2018-01-29 22:37:58 +0100 | [diff] [blame] | 144 | if fileno is None: |
| 145 | if family == -1: |
| 146 | family = AF_INET |
| 147 | if type == -1: |
| 148 | type = SOCK_STREAM |
| 149 | if proto == -1: |
| 150 | proto = 0 |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 151 | _socket.socket.__init__(self, family, type, proto, fileno) |
Guido van Rossum | 86bc33c | 2007-11-14 22:32:02 +0000 | [diff] [blame] | 152 | self._io_refs = 0 |
| 153 | self._closed = False |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 154 | |
Giampaolo Rodolà | b383dbb | 2010-09-08 22:44:12 +0000 | [diff] [blame] | 155 | def __enter__(self): |
| 156 | return self |
| 157 | |
| 158 | def __exit__(self, *args): |
| 159 | if not self._closed: |
| 160 | self.close() |
| 161 | |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 162 | def __repr__(self): |
Giampaolo Rodola' | 50331cb | 2013-04-10 15:49:47 +0200 | [diff] [blame] | 163 | """Wrap __repr__() to reveal the real class name and socket |
| 164 | address(es). |
| 165 | """ |
| 166 | closed = getattr(self, '_closed', False) |
Giampaolo Rodola' | b628149 | 2013-10-03 21:01:43 +0200 | [diff] [blame] | 167 | s = "<%s.%s%s fd=%i, family=%s, type=%s, proto=%i" \ |
Giampaolo Rodola' | 50331cb | 2013-04-10 15:49:47 +0200 | [diff] [blame] | 168 | % (self.__class__.__module__, |
Serhiy Storchaka | 521e586 | 2014-07-22 15:00:37 +0300 | [diff] [blame] | 169 | self.__class__.__qualname__, |
Giampaolo Rodola' | 50331cb | 2013-04-10 15:49:47 +0200 | [diff] [blame] | 170 | " [closed]" if closed else "", |
| 171 | self.fileno(), |
| 172 | self.family, |
| 173 | self.type, |
| 174 | self.proto) |
| 175 | if not closed: |
| 176 | try: |
| 177 | laddr = self.getsockname() |
| 178 | if laddr: |
| 179 | s += ", laddr=%s" % str(laddr) |
| 180 | except error: |
| 181 | pass |
| 182 | try: |
| 183 | raddr = self.getpeername() |
| 184 | if raddr: |
| 185 | s += ", raddr=%s" % str(raddr) |
| 186 | except error: |
| 187 | pass |
| 188 | s += '>' |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 189 | return s |
| 190 | |
Antoine Pitrou | 6d58d64 | 2011-03-20 23:56:36 +0100 | [diff] [blame] | 191 | def __getstate__(self): |
Serhiy Storchaka | 0353b4e | 2018-10-31 02:28:07 +0200 | [diff] [blame] | 192 | raise TypeError(f"cannot pickle {self.__class__.__name__!r} object") |
Antoine Pitrou | 6d58d64 | 2011-03-20 23:56:36 +0100 | [diff] [blame] | 193 | |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 194 | def dup(self): |
| 195 | """dup() -> socket object |
| 196 | |
Victor Stinner | daf4555 | 2013-08-28 00:53:59 +0200 | [diff] [blame] | 197 | Duplicate the socket. Return a new socket object connected to the same |
| 198 | system resource. The new socket is non-inheritable. |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 199 | """ |
| 200 | fd = dup(self.fileno()) |
| 201 | sock = self.__class__(self.family, self.type, self.proto, fileno=fd) |
| 202 | sock.settimeout(self.gettimeout()) |
| 203 | return sock |
| 204 | |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 205 | def accept(self): |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 206 | """accept() -> (socket object, address info) |
| 207 | |
| 208 | Wait for an incoming connection. Return a new socket |
| 209 | representing the connection, and the address of the client. |
| 210 | For IP sockets, the address info is a pair (hostaddr, port). |
| 211 | """ |
| 212 | fd, addr = self._accept() |
Yury Selivanov | 9818142 | 2017-12-18 20:02:54 -0500 | [diff] [blame] | 213 | sock = socket(self.family, self.type, self.proto, fileno=fd) |
Antoine Pitrou | 600232b | 2011-01-05 21:03:42 +0000 | [diff] [blame] | 214 | # Issue #7995: if no default timeout is set and the listening |
| 215 | # socket had a (non-zero) timeout, force the new socket in blocking |
| 216 | # mode to override platform-specific socket flags inheritance. |
| 217 | if getdefaulttimeout() is None and self.gettimeout(): |
| 218 | sock.setblocking(True) |
| 219 | return sock, addr |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 220 | |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 221 | def makefile(self, mode="r", buffering=None, *, |
Antoine Pitrou | 834bd81 | 2010-10-13 16:17:14 +0000 | [diff] [blame] | 222 | encoding=None, errors=None, newline=None): |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 223 | """makefile(...) -> an I/O stream connected to the socket |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 224 | |
Berker Peksag | 3fe64d0 | 2016-02-18 17:34:00 +0200 | [diff] [blame] | 225 | The arguments are as for io.open() after the filename, except the only |
| 226 | supported mode values are 'r' (default), 'w' and 'b'. |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 227 | """ |
Berker Peksag | 3fe64d0 | 2016-02-18 17:34:00 +0200 | [diff] [blame] | 228 | # XXX refactor to share code? |
Serhiy Storchaka | fca2fc0 | 2014-11-19 12:33:40 +0200 | [diff] [blame] | 229 | if not set(mode) <= {"r", "w", "b"}: |
| 230 | raise ValueError("invalid mode %r (only r, w, b allowed)" % (mode,)) |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 231 | writing = "w" in mode |
| 232 | reading = "r" in mode or not writing |
| 233 | assert reading or writing |
| 234 | binary = "b" in mode |
| 235 | rawmode = "" |
| 236 | if reading: |
| 237 | rawmode += "r" |
| 238 | if writing: |
| 239 | rawmode += "w" |
Guido van Rossum | 86bc33c | 2007-11-14 22:32:02 +0000 | [diff] [blame] | 240 | raw = SocketIO(self, rawmode) |
| 241 | self._io_refs += 1 |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 242 | if buffering is None: |
| 243 | buffering = -1 |
| 244 | if buffering < 0: |
| 245 | buffering = io.DEFAULT_BUFFER_SIZE |
| 246 | if buffering == 0: |
| 247 | if not binary: |
| 248 | raise ValueError("unbuffered streams must be binary") |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 249 | return raw |
| 250 | if reading and writing: |
| 251 | buffer = io.BufferedRWPair(raw, raw, buffering) |
| 252 | elif reading: |
| 253 | buffer = io.BufferedReader(raw, buffering) |
| 254 | else: |
| 255 | assert writing |
| 256 | buffer = io.BufferedWriter(raw, buffering) |
| 257 | if binary: |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 258 | return buffer |
Antoine Pitrou | 834bd81 | 2010-10-13 16:17:14 +0000 | [diff] [blame] | 259 | text = io.TextIOWrapper(buffer, encoding, errors, newline) |
Guido van Rossum | 93adc5d | 2007-07-17 20:41:19 +0000 | [diff] [blame] | 260 | text.mode = mode |
Guido van Rossum | 7d0a826 | 2007-05-21 23:13:11 +0000 | [diff] [blame] | 261 | return text |
| 262 | |
Giampaolo Rodola' | 915d141 | 2014-06-11 03:54:30 +0200 | [diff] [blame] | 263 | if hasattr(os, 'sendfile'): |
| 264 | |
| 265 | def _sendfile_use_sendfile(self, file, offset=0, count=None): |
| 266 | self._check_sendfile_params(file, offset, count) |
| 267 | sockno = self.fileno() |
| 268 | try: |
| 269 | fileno = file.fileno() |
| 270 | except (AttributeError, io.UnsupportedOperation) as err: |
| 271 | raise _GiveupOnSendfile(err) # not a regular file |
| 272 | try: |
| 273 | fsize = os.fstat(fileno).st_size |
Berker Peksag | bcfb35f | 2016-09-17 23:22:06 +0300 | [diff] [blame] | 274 | except OSError as err: |
Giampaolo Rodola' | 915d141 | 2014-06-11 03:54:30 +0200 | [diff] [blame] | 275 | raise _GiveupOnSendfile(err) # not a regular file |
| 276 | if not fsize: |
| 277 | return 0 # empty file |
| 278 | blocksize = fsize if not count else count |
| 279 | |
| 280 | timeout = self.gettimeout() |
| 281 | if timeout == 0: |
| 282 | raise ValueError("non-blocking sockets are not supported") |
| 283 | # poll/select have the advantage of not requiring any |
| 284 | # extra file descriptor, contrarily to epoll/kqueue |
| 285 | # (also, they require a single syscall). |
| 286 | if hasattr(selectors, 'PollSelector'): |
| 287 | selector = selectors.PollSelector() |
| 288 | else: |
| 289 | selector = selectors.SelectSelector() |
| 290 | selector.register(sockno, selectors.EVENT_WRITE) |
| 291 | |
| 292 | total_sent = 0 |
| 293 | # localize variable access to minimize overhead |
| 294 | selector_select = selector.select |
| 295 | os_sendfile = os.sendfile |
| 296 | try: |
| 297 | while True: |
| 298 | if timeout and not selector_select(timeout): |
| 299 | raise _socket.timeout('timed out') |
| 300 | if count: |
| 301 | blocksize = count - total_sent |
| 302 | if blocksize <= 0: |
| 303 | break |
| 304 | try: |
| 305 | sent = os_sendfile(sockno, fileno, offset, blocksize) |
| 306 | except BlockingIOError: |
| 307 | if not timeout: |
| 308 | # Block until the socket is ready to send some |
| 309 | # data; avoids hogging CPU resources. |
| 310 | selector_select() |
| 311 | continue |
| 312 | except OSError as err: |
| 313 | if total_sent == 0: |
| 314 | # We can get here for different reasons, the main |
| 315 | # one being 'file' is not a regular mmap(2)-like |
| 316 | # file, in which case we'll fall back on using |
| 317 | # plain send(). |
| 318 | raise _GiveupOnSendfile(err) |
| 319 | raise err from None |
| 320 | else: |
| 321 | if sent == 0: |
| 322 | break # EOF |
| 323 | offset += sent |
| 324 | total_sent += sent |
| 325 | return total_sent |
| 326 | finally: |
| 327 | if total_sent > 0 and hasattr(file, 'seek'): |
| 328 | file.seek(offset) |
| 329 | else: |
| 330 | def _sendfile_use_sendfile(self, file, offset=0, count=None): |
| 331 | raise _GiveupOnSendfile( |
| 332 | "os.sendfile() not available on this platform") |
| 333 | |
| 334 | def _sendfile_use_send(self, file, offset=0, count=None): |
| 335 | self._check_sendfile_params(file, offset, count) |
| 336 | if self.gettimeout() == 0: |
| 337 | raise ValueError("non-blocking sockets are not supported") |
| 338 | if offset: |
| 339 | file.seek(offset) |
| 340 | blocksize = min(count, 8192) if count else 8192 |
| 341 | total_sent = 0 |
| 342 | # localize variable access to minimize overhead |
| 343 | file_read = file.read |
| 344 | sock_send = self.send |
| 345 | try: |
| 346 | while True: |
| 347 | if count: |
| 348 | blocksize = min(count - total_sent, blocksize) |
| 349 | if blocksize <= 0: |
| 350 | break |
| 351 | data = memoryview(file_read(blocksize)) |
| 352 | if not data: |
| 353 | break # EOF |
| 354 | while True: |
| 355 | try: |
| 356 | sent = sock_send(data) |
| 357 | except BlockingIOError: |
| 358 | continue |
| 359 | else: |
| 360 | total_sent += sent |
| 361 | if sent < len(data): |
| 362 | data = data[sent:] |
| 363 | else: |
| 364 | break |
| 365 | return total_sent |
| 366 | finally: |
| 367 | if total_sent > 0 and hasattr(file, 'seek'): |
| 368 | file.seek(offset + total_sent) |
| 369 | |
| 370 | def _check_sendfile_params(self, file, offset, count): |
| 371 | if 'b' not in getattr(file, 'mode', 'b'): |
| 372 | raise ValueError("file should be opened in binary mode") |
| 373 | if not self.type & SOCK_STREAM: |
| 374 | raise ValueError("only SOCK_STREAM type sockets are supported") |
| 375 | if count is not None: |
| 376 | if not isinstance(count, int): |
| 377 | raise TypeError( |
| 378 | "count must be a positive integer (got {!r})".format(count)) |
| 379 | if count <= 0: |
| 380 | raise ValueError( |
| 381 | "count must be a positive integer (got {!r})".format(count)) |
| 382 | |
| 383 | def sendfile(self, file, offset=0, count=None): |
| 384 | """sendfile(file[, offset[, count]]) -> sent |
| 385 | |
| 386 | Send a file until EOF is reached by using high-performance |
| 387 | os.sendfile() and return the total number of bytes which |
| 388 | were sent. |
| 389 | *file* must be a regular file object opened in binary mode. |
| 390 | If os.sendfile() is not available (e.g. Windows) or file is |
| 391 | not a regular file socket.send() will be used instead. |
| 392 | *offset* tells from where to start reading the file. |
| 393 | If specified, *count* is the total number of bytes to transmit |
| 394 | as opposed to sending the file until EOF is reached. |
| 395 | File position is updated on return or also in case of error in |
| 396 | which case file.tell() can be used to figure out the number of |
| 397 | bytes which were sent. |
| 398 | The socket must be of SOCK_STREAM type. |
| 399 | Non-blocking sockets are not supported. |
| 400 | """ |
| 401 | try: |
| 402 | return self._sendfile_use_sendfile(file, offset, count) |
| 403 | except _GiveupOnSendfile: |
| 404 | return self._sendfile_use_send(file, offset, count) |
| 405 | |
Guido van Rossum | 86bc33c | 2007-11-14 22:32:02 +0000 | [diff] [blame] | 406 | def _decref_socketios(self): |
| 407 | if self._io_refs > 0: |
| 408 | self._io_refs -= 1 |
| 409 | if self._closed: |
| 410 | self.close() |
| 411 | |
Daniel Stutzbach | 19d6a4f | 2010-08-31 20:08:07 +0000 | [diff] [blame] | 412 | def _real_close(self, _ss=_socket.socket): |
Benjamin Peterson | 49203dc | 2010-08-31 20:10:55 +0000 | [diff] [blame] | 413 | # This function should not reference any globals. See issue #808164. |
Daniel Stutzbach | 19d6a4f | 2010-08-31 20:08:07 +0000 | [diff] [blame] | 414 | _ss.close(self) |
Bill Janssen | 54cc54c | 2007-12-14 22:08:56 +0000 | [diff] [blame] | 415 | |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 416 | def close(self): |
Benjamin Peterson | 49203dc | 2010-08-31 20:10:55 +0000 | [diff] [blame] | 417 | # This function should not reference any globals. See issue #808164. |
Guido van Rossum | 86bc33c | 2007-11-14 22:32:02 +0000 | [diff] [blame] | 418 | self._closed = True |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 419 | if self._io_refs <= 0: |
Bill Janssen | 54cc54c | 2007-12-14 22:08:56 +0000 | [diff] [blame] | 420 | self._real_close() |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 421 | |
Antoine Pitrou | 70deb3d | 2012-04-01 01:00:17 +0200 | [diff] [blame] | 422 | def detach(self): |
| 423 | """detach() -> file descriptor |
| 424 | |
| 425 | Close the socket object without closing the underlying file descriptor. |
| 426 | The object cannot be used after this call, but the file descriptor |
| 427 | can be reused for other purposes. The file descriptor is returned. |
| 428 | """ |
| 429 | self._closed = True |
| 430 | return super().detach() |
| 431 | |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 432 | @property |
| 433 | def family(self): |
| 434 | """Read-only access to the address family for this socket. |
| 435 | """ |
| 436 | return _intenum_converter(super().family, AddressFamily) |
| 437 | |
| 438 | @property |
| 439 | def type(self): |
| 440 | """Read-only access to the socket type. |
| 441 | """ |
Ethan Furman | 7184bac | 2014-10-14 18:56:53 -0700 | [diff] [blame] | 442 | return _intenum_converter(super().type, SocketKind) |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 443 | |
Victor Stinner | daf4555 | 2013-08-28 00:53:59 +0200 | [diff] [blame] | 444 | if os.name == 'nt': |
| 445 | def get_inheritable(self): |
| 446 | return os.get_handle_inheritable(self.fileno()) |
| 447 | def set_inheritable(self, inheritable): |
| 448 | os.set_handle_inheritable(self.fileno(), inheritable) |
| 449 | else: |
| 450 | def get_inheritable(self): |
| 451 | return os.get_inheritable(self.fileno()) |
| 452 | def set_inheritable(self, inheritable): |
| 453 | os.set_inheritable(self.fileno(), inheritable) |
| 454 | get_inheritable.__doc__ = "Get the inheritable flag of the socket" |
| 455 | set_inheritable.__doc__ = "Set the inheritable flag of the socket" |
| 456 | |
Guido van Rossum | 39eb8fa | 2007-11-16 01:24:05 +0000 | [diff] [blame] | 457 | def fromfd(fd, family, type, proto=0): |
| 458 | """ fromfd(fd, family, type[, proto]) -> socket object |
| 459 | |
| 460 | Create a socket object from a duplicate of the given file |
| 461 | descriptor. The remaining arguments are the same as for socket(). |
| 462 | """ |
| 463 | nfd = dup(fd) |
| 464 | return socket(family, type, proto, nfd) |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 465 | |
Kristján Valur Jónsson | 10f383a | 2012-04-07 11:23:31 +0000 | [diff] [blame] | 466 | if hasattr(_socket.socket, "share"): |
| 467 | def fromshare(info): |
| 468 | """ fromshare(info) -> socket object |
| 469 | |
Benjamin Peterson | 82f34ad | 2015-01-13 09:17:24 -0500 | [diff] [blame] | 470 | Create a socket object from the bytes object returned by |
Kristján Valur Jónsson | 10f383a | 2012-04-07 11:23:31 +0000 | [diff] [blame] | 471 | socket.share(pid). |
| 472 | """ |
| 473 | return socket(0, 0, 0, info) |
Ethan Furman | 8e120ac | 2014-10-18 15:10:49 -0700 | [diff] [blame] | 474 | __all__.append("fromshare") |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 475 | |
Antoine Pitrou | 9e0b864 | 2010-09-14 18:00:02 +0000 | [diff] [blame] | 476 | if hasattr(_socket, "socketpair"): |
| 477 | |
| 478 | def socketpair(family=None, type=SOCK_STREAM, proto=0): |
| 479 | """socketpair([family[, type[, proto]]]) -> (socket object, socket object) |
| 480 | |
| 481 | Create a pair of socket objects from the sockets returned by the platform |
| 482 | socketpair() function. |
| 483 | The arguments are the same as for socket() except the default family is |
| 484 | AF_UNIX if defined on the platform; otherwise, the default is AF_INET. |
| 485 | """ |
| 486 | if family is None: |
| 487 | try: |
| 488 | family = AF_UNIX |
| 489 | except NameError: |
| 490 | family = AF_INET |
| 491 | a, b = _socket.socketpair(family, type, proto) |
| 492 | a = socket(family, type, proto, a.detach()) |
| 493 | b = socket(family, type, proto, b.detach()) |
| 494 | return a, b |
| 495 | |
Charles-François Natali | 98c745a | 2014-10-14 21:22:44 +0100 | [diff] [blame] | 496 | else: |
| 497 | |
| 498 | # Origin: https://gist.github.com/4325783, by Geert Jansen. Public domain. |
| 499 | def socketpair(family=AF_INET, type=SOCK_STREAM, proto=0): |
| 500 | if family == AF_INET: |
| 501 | host = _LOCALHOST |
| 502 | elif family == AF_INET6: |
| 503 | host = _LOCALHOST_V6 |
| 504 | else: |
| 505 | raise ValueError("Only AF_INET and AF_INET6 socket address families " |
| 506 | "are supported") |
| 507 | if type != SOCK_STREAM: |
| 508 | raise ValueError("Only SOCK_STREAM socket type is supported") |
| 509 | if proto != 0: |
| 510 | raise ValueError("Only protocol zero is supported") |
| 511 | |
| 512 | # We create a connected TCP socket. Note the trick with |
| 513 | # setblocking(False) that prevents us from having to create a thread. |
| 514 | lsock = socket(family, type, proto) |
| 515 | try: |
| 516 | lsock.bind((host, 0)) |
| 517 | lsock.listen() |
| 518 | # On IPv6, ignore flow_info and scope_id |
| 519 | addr, port = lsock.getsockname()[:2] |
| 520 | csock = socket(family, type, proto) |
| 521 | try: |
| 522 | csock.setblocking(False) |
| 523 | try: |
| 524 | csock.connect((addr, port)) |
| 525 | except (BlockingIOError, InterruptedError): |
| 526 | pass |
| 527 | csock.setblocking(True) |
| 528 | ssock, _ = lsock.accept() |
| 529 | except: |
| 530 | csock.close() |
| 531 | raise |
| 532 | finally: |
| 533 | lsock.close() |
| 534 | return (ssock, csock) |
Victor Stinner | 3da5743 | 2016-08-17 14:40:08 +0200 | [diff] [blame] | 535 | __all__.append("socketpair") |
Charles-François Natali | 98c745a | 2014-10-14 21:22:44 +0100 | [diff] [blame] | 536 | |
| 537 | socketpair.__doc__ = """socketpair([family[, type[, proto]]]) -> (socket object, socket object) |
| 538 | Create a pair of socket objects from the sockets returned by the platform |
| 539 | socketpair() function. |
| 540 | The arguments are the same as for socket() except the default family is AF_UNIX |
| 541 | if defined on the platform; otherwise, the default is AF_INET. |
| 542 | """ |
Antoine Pitrou | 9e0b864 | 2010-09-14 18:00:02 +0000 | [diff] [blame] | 543 | |
Antoine Pitrou | 98b4670 | 2010-09-18 22:59:00 +0000 | [diff] [blame] | 544 | _blocking_errnos = { EAGAIN, EWOULDBLOCK } |
| 545 | |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 546 | class SocketIO(io.RawIOBase): |
| 547 | |
| 548 | """Raw I/O implementation for stream sockets. |
| 549 | |
| 550 | This class supports the makefile() method on sockets. It provides |
| 551 | the raw I/O interface on top of a socket object. |
| 552 | """ |
| 553 | |
Antoine Pitrou | 872b79d | 2010-09-15 08:39:25 +0000 | [diff] [blame] | 554 | # One might wonder why not let FileIO do the job instead. There are two |
| 555 | # main reasons why FileIO is not adapted: |
| 556 | # - it wouldn't work under Windows (where you can't used read() and |
| 557 | # write() on a socket handle) |
| 558 | # - it wouldn't work with socket timeouts (FileIO would ignore the |
| 559 | # timeout and consider the socket non-blocking) |
| 560 | |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 561 | # XXX More docs |
| 562 | |
Guido van Rossum | 86bc33c | 2007-11-14 22:32:02 +0000 | [diff] [blame] | 563 | def __init__(self, sock, mode): |
Benjamin Peterson | 44309e6 | 2008-11-22 00:41:45 +0000 | [diff] [blame] | 564 | if mode not in ("r", "w", "rw", "rb", "wb", "rwb"): |
Guido van Rossum | 5abbf75 | 2007-08-27 17:39:33 +0000 | [diff] [blame] | 565 | raise ValueError("invalid mode: %r" % mode) |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 566 | io.RawIOBase.__init__(self) |
| 567 | self._sock = sock |
Benjamin Peterson | 44309e6 | 2008-11-22 00:41:45 +0000 | [diff] [blame] | 568 | if "b" not in mode: |
| 569 | mode += "b" |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 570 | self._mode = mode |
Guido van Rossum | 5abbf75 | 2007-08-27 17:39:33 +0000 | [diff] [blame] | 571 | self._reading = "r" in mode |
| 572 | self._writing = "w" in mode |
Antoine Pitrou | 68e5c04 | 2011-02-25 23:07:44 +0000 | [diff] [blame] | 573 | self._timeout_occurred = False |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 574 | |
| 575 | def readinto(self, b): |
Antoine Pitrou | 5aa0d10 | 2010-09-15 09:32:45 +0000 | [diff] [blame] | 576 | """Read up to len(b) bytes into the writable buffer *b* and return |
| 577 | the number of bytes read. If the socket is non-blocking and no bytes |
| 578 | are available, None is returned. |
| 579 | |
| 580 | If *b* is non-empty, a 0 return value indicates that the connection |
| 581 | was shutdown at the other end. |
| 582 | """ |
Guido van Rossum | 5abbf75 | 2007-08-27 17:39:33 +0000 | [diff] [blame] | 583 | self._checkClosed() |
| 584 | self._checkReadable() |
Antoine Pitrou | 68e5c04 | 2011-02-25 23:07:44 +0000 | [diff] [blame] | 585 | if self._timeout_occurred: |
Andrew Svetlov | f7a17b4 | 2012-12-25 16:47:37 +0200 | [diff] [blame] | 586 | raise OSError("cannot read from timed out object") |
Gregory P. Smith | aafdca8 | 2010-01-04 04:50:36 +0000 | [diff] [blame] | 587 | while True: |
| 588 | try: |
| 589 | return self._sock.recv_into(b) |
Antoine Pitrou | 68e5c04 | 2011-02-25 23:07:44 +0000 | [diff] [blame] | 590 | except timeout: |
| 591 | self._timeout_occurred = True |
| 592 | raise |
Gregory P. Smith | aafdca8 | 2010-01-04 04:50:36 +0000 | [diff] [blame] | 593 | except error as e: |
Antoine Pitrou | 24d659d | 2011-10-23 23:49:42 +0200 | [diff] [blame] | 594 | if e.args[0] in _blocking_errnos: |
Antoine Pitrou | 98b4670 | 2010-09-18 22:59:00 +0000 | [diff] [blame] | 595 | return None |
Gregory P. Smith | aafdca8 | 2010-01-04 04:50:36 +0000 | [diff] [blame] | 596 | raise |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 597 | |
| 598 | def write(self, b): |
Antoine Pitrou | 5aa0d10 | 2010-09-15 09:32:45 +0000 | [diff] [blame] | 599 | """Write the given bytes or bytearray object *b* to the socket |
| 600 | and return the number of bytes written. This can be less than |
| 601 | len(b) if not all data could be written. If the socket is |
| 602 | non-blocking and no bytes could be written None is returned. |
| 603 | """ |
Guido van Rossum | 5abbf75 | 2007-08-27 17:39:33 +0000 | [diff] [blame] | 604 | self._checkClosed() |
| 605 | self._checkWritable() |
Antoine Pitrou | 98b4670 | 2010-09-18 22:59:00 +0000 | [diff] [blame] | 606 | try: |
| 607 | return self._sock.send(b) |
| 608 | except error as e: |
| 609 | # XXX what about EINTR? |
| 610 | if e.args[0] in _blocking_errnos: |
| 611 | return None |
| 612 | raise |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 613 | |
| 614 | def readable(self): |
Antoine Pitrou | 5aa0d10 | 2010-09-15 09:32:45 +0000 | [diff] [blame] | 615 | """True if the SocketIO is open for reading. |
| 616 | """ |
Antoine Pitrou | 1e7ee9d | 2012-09-14 17:28:10 +0200 | [diff] [blame] | 617 | if self.closed: |
| 618 | raise ValueError("I/O operation on closed socket.") |
| 619 | return self._reading |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 620 | |
| 621 | def writable(self): |
Antoine Pitrou | 5aa0d10 | 2010-09-15 09:32:45 +0000 | [diff] [blame] | 622 | """True if the SocketIO is open for writing. |
| 623 | """ |
Antoine Pitrou | 1e7ee9d | 2012-09-14 17:28:10 +0200 | [diff] [blame] | 624 | if self.closed: |
| 625 | raise ValueError("I/O operation on closed socket.") |
| 626 | return self._writing |
| 627 | |
| 628 | def seekable(self): |
| 629 | """True if the SocketIO is open for seeking. |
| 630 | """ |
| 631 | if self.closed: |
| 632 | raise ValueError("I/O operation on closed socket.") |
| 633 | return super().seekable() |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 634 | |
| 635 | def fileno(self): |
Antoine Pitrou | 5aa0d10 | 2010-09-15 09:32:45 +0000 | [diff] [blame] | 636 | """Return the file descriptor of the underlying socket. |
| 637 | """ |
Gregory P. Smith | de3369f | 2009-01-12 04:50:11 +0000 | [diff] [blame] | 638 | self._checkClosed() |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 639 | return self._sock.fileno() |
| 640 | |
Amaury Forgeot d'Arc | 9d24ff0 | 2008-11-20 23:15:52 +0000 | [diff] [blame] | 641 | @property |
| 642 | def name(self): |
Victor Stinner | c3a51ec | 2011-01-04 11:00:45 +0000 | [diff] [blame] | 643 | if not self.closed: |
| 644 | return self.fileno() |
| 645 | else: |
| 646 | return -1 |
Amaury Forgeot d'Arc | 9d24ff0 | 2008-11-20 23:15:52 +0000 | [diff] [blame] | 647 | |
| 648 | @property |
| 649 | def mode(self): |
| 650 | return self._mode |
| 651 | |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 652 | def close(self): |
Antoine Pitrou | 5aa0d10 | 2010-09-15 09:32:45 +0000 | [diff] [blame] | 653 | """Close the SocketIO object. This doesn't close the underlying |
| 654 | socket, except if all references to it have disappeared. |
| 655 | """ |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 656 | if self.closed: |
| 657 | return |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 658 | io.RawIOBase.close(self) |
Gregory P. Smith | de3369f | 2009-01-12 04:50:11 +0000 | [diff] [blame] | 659 | self._sock._decref_socketios() |
| 660 | self._sock = None |
Jeremy Hylton | 5accbdb | 2007-08-03 20:40:09 +0000 | [diff] [blame] | 661 | |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 662 | |
| 663 | def getfqdn(name=''): |
| 664 | """Get fully qualified domain name from name. |
| 665 | |
| 666 | An empty argument is interpreted as meaning the local host. |
| 667 | |
| 668 | First the hostname returned by gethostbyaddr() is checked, then |
| 669 | possibly existing aliases. In case no FQDN is available, hostname |
Brett Cannon | 01668a1 | 2005-03-11 00:04:17 +0000 | [diff] [blame] | 670 | from gethostname() is returned. |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 671 | """ |
| 672 | name = name.strip() |
Peter Schneider-Kamp | 2d2785a | 2000-08-16 20:30:21 +0000 | [diff] [blame] | 673 | if not name or name == '0.0.0.0': |
Fred Drake | a6070f0 | 2000-08-16 14:14:32 +0000 | [diff] [blame] | 674 | name = gethostname() |
| 675 | try: |
| 676 | hostname, aliases, ipaddrs = gethostbyaddr(name) |
| 677 | except error: |
| 678 | pass |
| 679 | else: |
| 680 | aliases.insert(0, hostname) |
| 681 | for name in aliases: |
| 682 | if '.' in name: |
| 683 | break |
| 684 | else: |
| 685 | name = hostname |
| 686 | return name |
| 687 | |
| 688 | |
Georg Brandl | f78e02b | 2008-06-10 17:40:04 +0000 | [diff] [blame] | 689 | _GLOBAL_DEFAULT_TIMEOUT = object() |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 690 | |
Gregory P. Smith | b406637 | 2010-01-03 03:28:29 +0000 | [diff] [blame] | 691 | def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT, |
| 692 | source_address=None): |
Georg Brandl | f78e02b | 2008-06-10 17:40:04 +0000 | [diff] [blame] | 693 | """Connect to *address* and return the socket object. |
| 694 | |
| 695 | Convenience function. Connect to *address* (a 2-tuple ``(host, |
| 696 | port)``) and return the socket object. Passing the optional |
| 697 | *timeout* parameter will set the timeout on the socket instance |
| 698 | before attempting to connect. If no *timeout* is supplied, the |
| 699 | global default timeout setting returned by :func:`getdefaulttimeout` |
Gregory P. Smith | b406637 | 2010-01-03 03:28:29 +0000 | [diff] [blame] | 700 | is used. If *source_address* is set it must be a tuple of (host, port) |
| 701 | for the socket to bind as a source address before making the connection. |
Serhiy Storchaka | 6a7b3a7 | 2016-04-17 08:32:47 +0300 | [diff] [blame] | 702 | A host of '' or port 0 tells the OS to use the default. |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 703 | """ |
| 704 | |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 705 | host, port = address |
Antoine Pitrou | 4b92b5f | 2010-09-07 21:05:49 +0000 | [diff] [blame] | 706 | err = None |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 707 | for res in getaddrinfo(host, port, 0, SOCK_STREAM): |
| 708 | af, socktype, proto, canonname, sa = res |
| 709 | sock = None |
| 710 | try: |
| 711 | sock = socket(af, socktype, proto) |
Georg Brandl | f78e02b | 2008-06-10 17:40:04 +0000 | [diff] [blame] | 712 | if timeout is not _GLOBAL_DEFAULT_TIMEOUT: |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 713 | sock.settimeout(timeout) |
Gregory P. Smith | b406637 | 2010-01-03 03:28:29 +0000 | [diff] [blame] | 714 | if source_address: |
| 715 | sock.bind(source_address) |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 716 | sock.connect(sa) |
Victor Stinner | acb9fa7 | 2017-09-13 10:10:10 -0700 | [diff] [blame] | 717 | # Break explicitly a reference cycle |
| 718 | err = None |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 719 | return sock |
| 720 | |
Antoine Pitrou | 4b92b5f | 2010-09-07 21:05:49 +0000 | [diff] [blame] | 721 | except error as _: |
| 722 | err = _ |
Guido van Rossum | d8faa36 | 2007-04-27 19:54:29 +0000 | [diff] [blame] | 723 | if sock is not None: |
| 724 | sock.close() |
| 725 | |
Antoine Pitrou | 4b92b5f | 2010-09-07 21:05:49 +0000 | [diff] [blame] | 726 | if err is not None: |
| 727 | raise err |
| 728 | else: |
| 729 | raise error("getaddrinfo returns an empty list") |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 730 | |
Giampaolo Rodola | eb7e29f | 2019-04-09 00:34:02 +0200 | [diff] [blame] | 731 | |
| 732 | def has_dualstack_ipv6(): |
| 733 | """Return True if the platform supports creating a SOCK_STREAM socket |
| 734 | which can handle both AF_INET and AF_INET6 (IPv4 / IPv6) connections. |
| 735 | """ |
| 736 | if not has_ipv6 \ |
| 737 | or not hasattr(_socket, 'IPPROTO_IPV6') \ |
| 738 | or not hasattr(_socket, 'IPV6_V6ONLY'): |
| 739 | return False |
| 740 | try: |
| 741 | with socket(AF_INET6, SOCK_STREAM) as sock: |
| 742 | sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 0) |
| 743 | return True |
| 744 | except error: |
| 745 | return False |
| 746 | |
| 747 | |
Giampaolo Rodola | 8702b67 | 2019-04-09 04:42:06 +0200 | [diff] [blame] | 748 | def create_server(address, *, family=AF_INET, backlog=None, reuse_port=False, |
Giampaolo Rodola | eb7e29f | 2019-04-09 00:34:02 +0200 | [diff] [blame] | 749 | dualstack_ipv6=False): |
| 750 | """Convenience function which creates a SOCK_STREAM type socket |
| 751 | bound to *address* (a 2-tuple (host, port)) and return the socket |
| 752 | object. |
| 753 | |
| 754 | *family* should be either AF_INET or AF_INET6. |
| 755 | *backlog* is the queue size passed to socket.listen(). |
| 756 | *reuse_port* dictates whether to use the SO_REUSEPORT socket option. |
| 757 | *dualstack_ipv6*: if true and the platform supports it, it will |
| 758 | create an AF_INET6 socket able to accept both IPv4 or IPv6 |
| 759 | connections. When false it will explicitly disable this option on |
| 760 | platforms that enable it by default (e.g. Linux). |
| 761 | |
| 762 | >>> with create_server((None, 8000)) as server: |
| 763 | ... while True: |
| 764 | ... conn, addr = server.accept() |
| 765 | ... # handle new connection |
| 766 | """ |
| 767 | if reuse_port and not hasattr(_socket, "SO_REUSEPORT"): |
| 768 | raise ValueError("SO_REUSEPORT not supported on this platform") |
| 769 | if dualstack_ipv6: |
| 770 | if not has_dualstack_ipv6(): |
| 771 | raise ValueError("dualstack_ipv6 not supported on this platform") |
| 772 | if family != AF_INET6: |
| 773 | raise ValueError("dualstack_ipv6 requires AF_INET6 family") |
| 774 | sock = socket(family, SOCK_STREAM) |
| 775 | try: |
| 776 | # Note about Windows. We don't set SO_REUSEADDR because: |
| 777 | # 1) It's unnecessary: bind() will succeed even in case of a |
| 778 | # previous closed socket on the same address and still in |
| 779 | # TIME_WAIT state. |
| 780 | # 2) If set, another socket is free to bind() on the same |
| 781 | # address, effectively preventing this one from accepting |
| 782 | # connections. Also, it may set the process in a state where |
| 783 | # it'll no longer respond to any signals or graceful kills. |
| 784 | # See: msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx |
| 785 | if os.name not in ('nt', 'cygwin') and \ |
| 786 | hasattr(_socket, 'SO_REUSEADDR'): |
| 787 | try: |
| 788 | sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) |
| 789 | except error: |
| 790 | # Fail later on bind(), for platforms which may not |
| 791 | # support this option. |
| 792 | pass |
| 793 | if reuse_port: |
| 794 | sock.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1) |
| 795 | if has_ipv6 and family == AF_INET6: |
| 796 | if dualstack_ipv6: |
| 797 | sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 0) |
| 798 | elif hasattr(_socket, "IPV6_V6ONLY") and \ |
| 799 | hasattr(_socket, "IPPROTO_IPV6"): |
| 800 | sock.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 1) |
| 801 | try: |
| 802 | sock.bind(address) |
| 803 | except error as err: |
| 804 | msg = '%s (while attempting to bind on address %r)' % \ |
| 805 | (err.strerror, address) |
| 806 | raise error(err.errno, msg) from None |
Giampaolo Rodola | 8702b67 | 2019-04-09 04:42:06 +0200 | [diff] [blame] | 807 | if backlog is None: |
| 808 | sock.listen() |
| 809 | else: |
| 810 | sock.listen(backlog) |
Giampaolo Rodola | eb7e29f | 2019-04-09 00:34:02 +0200 | [diff] [blame] | 811 | return sock |
| 812 | except error: |
| 813 | sock.close() |
| 814 | raise |
| 815 | |
| 816 | |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 817 | def getaddrinfo(host, port, family=0, type=0, proto=0, flags=0): |
| 818 | """Resolve host and port into list of address info entries. |
| 819 | |
| 820 | Translate the host/port argument into a sequence of 5-tuples that contain |
| 821 | all the necessary arguments for creating a socket connected to that service. |
| 822 | host is a domain name, a string representation of an IPv4/v6 address or |
| 823 | None. port is a string service name such as 'http', a numeric port number or |
| 824 | None. By passing None as the value of host and port, you can pass NULL to |
| 825 | the underlying C API. |
| 826 | |
| 827 | The family, type and proto arguments can be optionally specified in order to |
| 828 | narrow the list of addresses returned. Passing zero as a value for each of |
| 829 | these arguments selects the full range of results. |
| 830 | """ |
| 831 | # We override this function since we want to translate the numeric family |
| 832 | # and socket type values to enum constants. |
| 833 | addrlist = [] |
| 834 | for res in _socket.getaddrinfo(host, port, family, type, proto, flags): |
| 835 | af, socktype, proto, canonname, sa = res |
| 836 | addrlist.append((_intenum_converter(af, AddressFamily), |
Ethan Furman | 7184bac | 2014-10-14 18:56:53 -0700 | [diff] [blame] | 837 | _intenum_converter(socktype, SocketKind), |
Eli Bendersky | b2ff3cf | 2013-08-31 15:13:30 -0700 | [diff] [blame] | 838 | proto, canonname, sa)) |
| 839 | return addrlist |