Python code coverage for Lib/uuid.py

#	count	content
1	n/a	r"""UUID objects (universally unique identifiers) according to RFC 4122.
2	n/a
3	n/a	This module provides immutable UUID objects (class UUID) and the functions
4	n/a	uuid1(), uuid3(), uuid4(), uuid5() for generating version 1, 3, 4, and 5
5	n/a	UUIDs as specified in RFC 4122.
6	n/a
7	n/a	If all you want is a unique ID, you should probably call uuid1() or uuid4().
8	n/a	Note that uuid1() may compromise privacy since it creates a UUID containing
9	n/a	the computer's network address. uuid4() creates a random UUID.
10	n/a
11	n/a	Typical usage:
12	n/a
13	n/a	>>> import uuid
14	n/a
15	n/a	# make a UUID based on the host ID and current time
16	n/a	>>> uuid.uuid1() # doctest: +SKIP
17	n/a	UUID('a8098c1a-f86e-11da-bd1a-00112444be1e')
18	n/a
19	n/a	# make a UUID using an MD5 hash of a namespace UUID and a name
20	n/a	>>> uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org')
21	n/a	UUID('6fa459ea-ee8a-3ca4-894e-db77e160355e')
22	n/a
23	n/a	# make a random UUID
24	n/a	>>> uuid.uuid4() # doctest: +SKIP
25	n/a	UUID('16fd2706-8baf-433b-82eb-8c7fada847da')
26	n/a
27	n/a	# make a UUID using a SHA-1 hash of a namespace UUID and a name
28	n/a	>>> uuid.uuid5(uuid.NAMESPACE_DNS, 'python.org')
29	n/a	UUID('886313e1-3b8a-5372-9b90-0c9aee199e5d')
30	n/a
31	n/a	# make a UUID from a string of hex digits (braces and hyphens ignored)
32	n/a	>>> x = uuid.UUID('{00010203-0405-0607-0809-0a0b0c0d0e0f}')
33	n/a
34	n/a	# convert a UUID to a string of hex digits in standard form
35	n/a	>>> str(x)
36	n/a	'00010203-0405-0607-0809-0a0b0c0d0e0f'
37	n/a
38	n/a	# get the raw 16 bytes of the UUID
39	n/a	>>> x.bytes
40	n/a	b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f'
41	n/a
42	n/a	# make a UUID from a 16-byte string
43	n/a	>>> uuid.UUID(bytes=x.bytes)
44	n/a	UUID('00010203-0405-0607-0809-0a0b0c0d0e0f')
45	n/a	"""
46	n/a
47	n/a	import os
48	n/a
49	n/a	__author__ = 'Ka-Ping Yee <ping@zesty.ca>'
50	n/a
51	n/a	RESERVED_NCS, RFC_4122, RESERVED_MICROSOFT, RESERVED_FUTURE = [
52	n/a	'reserved for NCS compatibility', 'specified in RFC 4122',
53	n/a	'reserved for Microsoft compatibility', 'reserved for future definition']
54	n/a
55	n/a	int_ = int # The built-in int type
56	n/a	bytes_ = bytes # The built-in bytes type
57	n/a
58	n/a	class UUID(object):
59	n/a	"""Instances of the UUID class represent UUIDs as specified in RFC 4122.
60	n/a	UUID objects are immutable, hashable, and usable as dictionary keys.
61	n/a	Converting a UUID to a string with str() yields something in the form
62	n/a	'12345678-1234-1234-1234-123456789abc'. The UUID constructor accepts
63	n/a	five possible forms: a similar string of hexadecimal digits, or a tuple
64	n/a	of six integer fields (with 32-bit, 16-bit, 16-bit, 8-bit, 8-bit, and
65	n/a	48-bit values respectively) as an argument named 'fields', or a string
66	n/a	of 16 bytes (with all the integer fields in big-endian order) as an
67	n/a	argument named 'bytes', or a string of 16 bytes (with the first three
68	n/a	fields in little-endian order) as an argument named 'bytes_le', or a
69	n/a	single 128-bit integer as an argument named 'int'.
70	n/a
71	n/a	UUIDs have these read-only attributes:
72	n/a
73	n/a	bytes the UUID as a 16-byte string (containing the six
74	n/a	integer fields in big-endian byte order)
75	n/a
76	n/a	bytes_le the UUID as a 16-byte string (with time_low, time_mid,
77	n/a	and time_hi_version in little-endian byte order)
78	n/a
79	n/a	fields a tuple of the six integer fields of the UUID,
80	n/a	which are also available as six individual attributes
81	n/a	and two derived attributes:
82	n/a
83	n/a	time_low the first 32 bits of the UUID
84	n/a	time_mid the next 16 bits of the UUID
85	n/a	time_hi_version the next 16 bits of the UUID
86	n/a	clock_seq_hi_variant the next 8 bits of the UUID
87	n/a	clock_seq_low the next 8 bits of the UUID
88	n/a	node the last 48 bits of the UUID
89	n/a
90	n/a	time the 60-bit timestamp
91	n/a	clock_seq the 14-bit sequence number
92	n/a
93	n/a	hex the UUID as a 32-character hexadecimal string
94	n/a
95	n/a	int the UUID as a 128-bit integer
96	n/a
97	n/a	urn the UUID as a URN as specified in RFC 4122
98	n/a
99	n/a	variant the UUID variant (one of the constants RESERVED_NCS,
100	n/a	RFC_4122, RESERVED_MICROSOFT, or RESERVED_FUTURE)
101	n/a
102	n/a	version the UUID version number (1 through 5, meaningful only
103	n/a	when the variant is RFC_4122)
104	n/a	"""
105	n/a
106	n/a	def __init__(self, hex=None, bytes=None, bytes_le=None, fields=None,
107	n/a	int=None, version=None):
108	n/a	r"""Create a UUID from either a string of 32 hexadecimal digits,
109	n/a	a string of 16 bytes as the 'bytes' argument, a string of 16 bytes
110	n/a	in little-endian order as the 'bytes_le' argument, a tuple of six
111	n/a	integers (32-bit time_low, 16-bit time_mid, 16-bit time_hi_version,
112	n/a	8-bit clock_seq_hi_variant, 8-bit clock_seq_low, 48-bit node) as
113	n/a	the 'fields' argument, or a single 128-bit integer as the 'int'
114	n/a	argument. When a string of hex digits is given, curly braces,
115	n/a	hyphens, and a URN prefix are all optional. For example, these
116	n/a	expressions all yield the same UUID:
117	n/a
118	n/a	UUID('{12345678-1234-5678-1234-567812345678}')
119	n/a	UUID('12345678123456781234567812345678')
120	n/a	UUID('urn:uuid:12345678-1234-5678-1234-567812345678')
121	n/a	UUID(bytes='\x12\x34\x56\x78'*4)
122	n/a	UUID(bytes_le='\x78\x56\x34\x12\x34\x12\x78\x56' +
123	n/a	'\x12\x34\x56\x78\x12\x34\x56\x78')
124	n/a	UUID(fields=(0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x567812345678))
125	n/a	UUID(int=0x12345678123456781234567812345678)
126	n/a
127	n/a	Exactly one of 'hex', 'bytes', 'bytes_le', 'fields', or 'int' must
128	n/a	be given. The 'version' argument is optional; if given, the resulting
129	n/a	UUID will have its variant and version set according to RFC 4122,
130	n/a	overriding the given 'hex', 'bytes', 'bytes_le', 'fields', or 'int'.
131	n/a	"""
132	n/a
133	n/a	if [hex, bytes, bytes_le, fields, int].count(None) != 4:
134	n/a	raise TypeError('one of the hex, bytes, bytes_le, fields, '
135	n/a	'or int arguments must be given')
136	n/a	if hex is not None:
137	n/a	hex = hex.replace('urn:', '').replace('uuid:', '')
138	n/a	hex = hex.strip('{}').replace('-', '')
139	n/a	if len(hex) != 32:
140	n/a	raise ValueError('badly formed hexadecimal UUID string')
141	n/a	int = int_(hex, 16)
142	n/a	if bytes_le is not None:
143	n/a	if len(bytes_le) != 16:
144	n/a	raise ValueError('bytes_le is not a 16-char string')
145	n/a	bytes = (bytes_le[4-1::-1] + bytes_le[6-1:4-1:-1] +
146	n/a	bytes_le[8-1:6-1:-1] + bytes_le[8:])
147	n/a	if bytes is not None:
148	n/a	if len(bytes) != 16:
149	n/a	raise ValueError('bytes is not a 16-char string')
150	n/a	assert isinstance(bytes, bytes_), repr(bytes)
151	n/a	int = int_.from_bytes(bytes, byteorder='big')
152	n/a	if fields is not None:
153	n/a	if len(fields) != 6:
154	n/a	raise ValueError('fields is not a 6-tuple')
155	n/a	(time_low, time_mid, time_hi_version,
156	n/a	clock_seq_hi_variant, clock_seq_low, node) = fields
157	n/a	if not 0 <= time_low < 1<<32:
158	n/a	raise ValueError('field 1 out of range (need a 32-bit value)')
159	n/a	if not 0 <= time_mid < 1<<16:
160	n/a	raise ValueError('field 2 out of range (need a 16-bit value)')
161	n/a	if not 0 <= time_hi_version < 1<<16:
162	n/a	raise ValueError('field 3 out of range (need a 16-bit value)')
163	n/a	if not 0 <= clock_seq_hi_variant < 1<<8:
164	n/a	raise ValueError('field 4 out of range (need an 8-bit value)')
165	n/a	if not 0 <= clock_seq_low < 1<<8:
166	n/a	raise ValueError('field 5 out of range (need an 8-bit value)')
167	n/a	if not 0 <= node < 1<<48:
168	n/a	raise ValueError('field 6 out of range (need a 48-bit value)')
169	n/a	clock_seq = (clock_seq_hi_variant << 8) \| clock_seq_low
170	n/a	int = ((time_low << 96) \| (time_mid << 80) \|
171	n/a	(time_hi_version << 64) \| (clock_seq << 48) \| node)
172	n/a	if int is not None:
173	n/a	if not 0 <= int < 1<<128:
174	n/a	raise ValueError('int is out of range (need a 128-bit value)')
175	n/a	if version is not None:
176	n/a	if not 1 <= version <= 5:
177	n/a	raise ValueError('illegal version number')
178	n/a	# Set the variant to RFC 4122.
179	n/a	int &= ~(0xc000 << 48)
180	n/a	int \|= 0x8000 << 48
181	n/a	# Set the version number.
182	n/a	int &= ~(0xf000 << 64)
183	n/a	int \|= version << 76
184	n/a	self.__dict__['int'] = int
185	n/a
186	n/a	def __eq__(self, other):
187	n/a	if isinstance(other, UUID):
188	n/a	return self.int == other.int
189	n/a	return NotImplemented
190	n/a
191	n/a	# Q. What's the value of being able to sort UUIDs?
192	n/a	# A. Use them as keys in a B-Tree or similar mapping.
193	n/a
194	n/a	def __lt__(self, other):
195	n/a	if isinstance(other, UUID):
196	n/a	return self.int < other.int
197	n/a	return NotImplemented
198	n/a
199	n/a	def __gt__(self, other):
200	n/a	if isinstance(other, UUID):
201	n/a	return self.int > other.int
202	n/a	return NotImplemented
203	n/a
204	n/a	def __le__(self, other):
205	n/a	if isinstance(other, UUID):
206	n/a	return self.int <= other.int
207	n/a	return NotImplemented
208	n/a
209	n/a	def __ge__(self, other):
210	n/a	if isinstance(other, UUID):
211	n/a	return self.int >= other.int
212	n/a	return NotImplemented
213	n/a
214	n/a	def __hash__(self):
215	n/a	return hash(self.int)
216	n/a
217	n/a	def __int__(self):
218	n/a	return self.int
219	n/a
220	n/a	def __repr__(self):
221	n/a	return '%s(%r)' % (self.__class__.__name__, str(self))
222	n/a
223	n/a	def __setattr__(self, name, value):
224	n/a	raise TypeError('UUID objects are immutable')
225	n/a
226	n/a	def __str__(self):
227	n/a	hex = '%032x' % self.int
228	n/a	return '%s-%s-%s-%s-%s' % (
229	n/a	hex[:8], hex[8:12], hex[12:16], hex[16:20], hex[20:])
230	n/a
231	n/a	@property
232	n/a	def bytes(self):
233	n/a	return self.int.to_bytes(16, 'big')
234	n/a
235	n/a	@property
236	n/a	def bytes_le(self):
237	n/a	bytes = self.bytes
238	n/a	return (bytes[4-1::-1] + bytes[6-1:4-1:-1] + bytes[8-1:6-1:-1] +
239	n/a	bytes[8:])
240	n/a
241	n/a	@property
242	n/a	def fields(self):
243	n/a	return (self.time_low, self.time_mid, self.time_hi_version,
244	n/a	self.clock_seq_hi_variant, self.clock_seq_low, self.node)
245	n/a
246	n/a	@property
247	n/a	def time_low(self):
248	n/a	return self.int >> 96
249	n/a
250	n/a	@property
251	n/a	def time_mid(self):
252	n/a	return (self.int >> 80) & 0xffff
253	n/a
254	n/a	@property
255	n/a	def time_hi_version(self):
256	n/a	return (self.int >> 64) & 0xffff
257	n/a
258	n/a	@property
259	n/a	def clock_seq_hi_variant(self):
260	n/a	return (self.int >> 56) & 0xff
261	n/a
262	n/a	@property
263	n/a	def clock_seq_low(self):
264	n/a	return (self.int >> 48) & 0xff
265	n/a
266	n/a	@property
267	n/a	def time(self):
268	n/a	return (((self.time_hi_version & 0x0fff) << 48) \|
269	n/a	(self.time_mid << 32) \| self.time_low)
270	n/a
271	n/a	@property
272	n/a	def clock_seq(self):
273	n/a	return (((self.clock_seq_hi_variant & 0x3f) << 8) \|
274	n/a	self.clock_seq_low)
275	n/a
276	n/a	@property
277	n/a	def node(self):
278	n/a	return self.int & 0xffffffffffff
279	n/a
280	n/a	@property
281	n/a	def hex(self):
282	n/a	return '%032x' % self.int
283	n/a
284	n/a	@property
285	n/a	def urn(self):
286	n/a	return 'urn:uuid:' + str(self)
287	n/a
288	n/a	@property
289	n/a	def variant(self):
290	n/a	if not self.int & (0x8000 << 48):
291	n/a	return RESERVED_NCS
292	n/a	elif not self.int & (0x4000 << 48):
293	n/a	return RFC_4122
294	n/a	elif not self.int & (0x2000 << 48):
295	n/a	return RESERVED_MICROSOFT
296	n/a	else:
297	n/a	return RESERVED_FUTURE
298	n/a
299	n/a	@property
300	n/a	def version(self):
301	n/a	# The version bits are only meaningful for RFC 4122 UUIDs.
302	n/a	if self.variant == RFC_4122:
303	n/a	return int((self.int >> 76) & 0xf)
304	n/a
305	n/a	def _popen(command, *args):
306	n/a	import os, shutil, subprocess
307	n/a	executable = shutil.which(command)
308	n/a	if executable is None:
309	n/a	path = os.pathsep.join(('/sbin', '/usr/sbin'))
310	n/a	executable = shutil.which(command, path=path)
311	n/a	if executable is None:
312	n/a	return None
313	n/a	# LC_ALL=C to ensure English output, stderr=DEVNULL to prevent output
314	n/a	# on stderr (Note: we don't have an example where the words we search
315	n/a	# for are actually localized, but in theory some system could do so.)
316	n/a	env = dict(os.environ)
317	n/a	env['LC_ALL'] = 'C'
318	n/a	proc = subprocess.Popen((executable,) + args,
319	n/a	stdout=subprocess.PIPE,
320	n/a	stderr=subprocess.DEVNULL,
321	n/a	env=env)
322	n/a	return proc
323	n/a
324	n/a	def _find_mac(command, args, hw_identifiers, get_index):
325	n/a	try:
326	n/a	proc = _popen(command, *args.split())
327	n/a	if not proc:
328	n/a	return
329	n/a	with proc:
330	n/a	for line in proc.stdout:
331	n/a	words = line.lower().rstrip().split()
332	n/a	for i in range(len(words)):
333	n/a	if words[i] in hw_identifiers:
334	n/a	try:
335	n/a	word = words[get_index(i)]
336	n/a	mac = int(word.replace(b':', b''), 16)
337	n/a	if mac:
338	n/a	return mac
339	n/a	except (ValueError, IndexError):
340	n/a	# Virtual interfaces, such as those provided by
341	n/a	# VPNs, do not have a colon-delimited MAC address
342	n/a	# as expected, but a 16-byte HWAddr separated by
343	n/a	# dashes. These should be ignored in favor of a
344	n/a	# real MAC address
345	n/a	pass
346	n/a	except OSError:
347	n/a	pass
348	n/a
349	n/a	def _ifconfig_getnode():
350	n/a	"""Get the hardware address on Unix by running ifconfig."""
351	n/a	# This works on Linux ('' or '-a'), Tru64 ('-av'), but not all Unixes.
352	n/a	for args in ('', '-a', '-av'):
353	n/a	mac = _find_mac('ifconfig', args, [b'hwaddr', b'ether'], lambda i: i+1)
354	n/a	if mac:
355	n/a	return mac
356	n/a
357	n/a	def _ip_getnode():
358	n/a	"""Get the hardware address on Unix by running ip."""
359	n/a	# This works on Linux with iproute2.
360	n/a	mac = _find_mac('ip', 'link list', [b'link/ether'], lambda i: i+1)
361	n/a	if mac:
362	n/a	return mac
363	n/a
364	n/a	def _arp_getnode():
365	n/a	"""Get the hardware address on Unix by running arp."""
366	n/a	import os, socket
367	n/a	try:
368	n/a	ip_addr = socket.gethostbyname(socket.gethostname())
369	n/a	except OSError:
370	n/a	return None
371	n/a
372	n/a	# Try getting the MAC addr from arp based on our IP address (Solaris).
373	n/a	return _find_mac('arp', '-an', [os.fsencode(ip_addr)], lambda i: -1)
374	n/a
375	n/a	def _lanscan_getnode():
376	n/a	"""Get the hardware address on Unix by running lanscan."""
377	n/a	# This might work on HP-UX.
378	n/a	return _find_mac('lanscan', '-ai', [b'lan0'], lambda i: 0)
379	n/a
380	n/a	def _netstat_getnode():
381	n/a	"""Get the hardware address on Unix by running netstat."""
382	n/a	# This might work on AIX, Tru64 UNIX and presumably on IRIX.
383	n/a	try:
384	n/a	proc = _popen('netstat', '-ia')
385	n/a	if not proc:
386	n/a	return
387	n/a	with proc:
388	n/a	words = proc.stdout.readline().rstrip().split()
389	n/a	try:
390	n/a	i = words.index(b'Address')
391	n/a	except ValueError:
392	n/a	return
393	n/a	for line in proc.stdout:
394	n/a	try:
395	n/a	words = line.rstrip().split()
396	n/a	word = words[i]
397	n/a	if len(word) == 17 and word.count(b':') == 5:
398	n/a	mac = int(word.replace(b':', b''), 16)
399	n/a	if mac:
400	n/a	return mac
401	n/a	except (ValueError, IndexError):
402	n/a	pass
403	n/a	except OSError:
404	n/a	pass
405	n/a
406	n/a	def _ipconfig_getnode():
407	n/a	"""Get the hardware address on Windows by running ipconfig.exe."""
408	n/a	import os, re
409	n/a	dirs = ['', r'c:\windows\system32', r'c:\winnt\system32']
410	n/a	try:
411	n/a	import ctypes
412	n/a	buffer = ctypes.create_string_buffer(300)
413	n/a	ctypes.windll.kernel32.GetSystemDirectoryA(buffer, 300)
414	n/a	dirs.insert(0, buffer.value.decode('mbcs'))
415	n/a	except:
416	n/a	pass
417	n/a	for dir in dirs:
418	n/a	try:
419	n/a	pipe = os.popen(os.path.join(dir, 'ipconfig') + ' /all')
420	n/a	except OSError:
421	n/a	continue
422	n/a	with pipe:
423	n/a	for line in pipe:
424	n/a	value = line.split(':')[-1].strip().lower()
425	n/a	if re.match('([0-9a-f][0-9a-f]-){5}[0-9a-f][0-9a-f]', value):
426	n/a	return int(value.replace('-', ''), 16)
427	n/a
428	n/a	def _netbios_getnode():
429	n/a	"""Get the hardware address on Windows using NetBIOS calls.
430	n/a	See http://support.microsoft.com/kb/118623 for details."""
431	n/a	import win32wnet, netbios
432	n/a	ncb = netbios.NCB()
433	n/a	ncb.Command = netbios.NCBENUM
434	n/a	ncb.Buffer = adapters = netbios.LANA_ENUM()
435	n/a	adapters._pack()
436	n/a	if win32wnet.Netbios(ncb) != 0:
437	n/a	return
438	n/a	adapters._unpack()
439	n/a	for i in range(adapters.length):
440	n/a	ncb.Reset()
441	n/a	ncb.Command = netbios.NCBRESET
442	n/a	ncb.Lana_num = ord(adapters.lana[i])
443	n/a	if win32wnet.Netbios(ncb) != 0:
444	n/a	continue
445	n/a	ncb.Reset()
446	n/a	ncb.Command = netbios.NCBASTAT
447	n/a	ncb.Lana_num = ord(adapters.lana[i])
448	n/a	ncb.Callname = '*'.ljust(16)
449	n/a	ncb.Buffer = status = netbios.ADAPTER_STATUS()
450	n/a	if win32wnet.Netbios(ncb) != 0:
451	n/a	continue
452	n/a	status._unpack()
453	n/a	bytes = status.adapter_address[:6]
454	n/a	if len(bytes) != 6:
455	n/a	continue
456	n/a	return int.from_bytes(bytes, 'big')
457	n/a
458	n/a	# Thanks to Thomas Heller for ctypes and for his help with its use here.
459	n/a
460	n/a	# If ctypes is available, use it to find system routines for UUID generation.
461	n/a	# XXX This makes the module non-thread-safe!
462	n/a	_uuid_generate_time = _UuidCreate = None
463	n/a	try:
464	n/a	import ctypes, ctypes.util
465	n/a	import sys
466	n/a
467	n/a	# The uuid_generate_* routines are provided by libuuid on at least
468	n/a	# Linux and FreeBSD, and provided by libc on Mac OS X.
469	n/a	_libnames = ['uuid']
470	n/a	if not sys.platform.startswith('win'):
471	n/a	_libnames.append('c')
472	n/a	for libname in _libnames:
473	n/a	try:
474	n/a	lib = ctypes.CDLL(ctypes.util.find_library(libname))
475	n/a	except Exception:
476	n/a	continue
477	n/a	if hasattr(lib, 'uuid_generate_time'):
478	n/a	_uuid_generate_time = lib.uuid_generate_time
479	n/a	break
480	n/a	del _libnames
481	n/a
482	n/a	# The uuid_generate_* functions are broken on MacOS X 10.5, as noted
483	n/a	# in issue #8621 the function generates the same sequence of values
484	n/a	# in the parent process and all children created using fork (unless
485	n/a	# those children use exec as well).
486	n/a	#
487	n/a	# Assume that the uuid_generate functions are broken from 10.5 onward,
488	n/a	# the test can be adjusted when a later version is fixed.
489	n/a	if sys.platform == 'darwin':
490	n/a	if int(os.uname().release.split('.')[0]) >= 9:
491	n/a	_uuid_generate_time = None
492	n/a
493	n/a	# On Windows prior to 2000, UuidCreate gives a UUID containing the
494	n/a	# hardware address. On Windows 2000 and later, UuidCreate makes a
495	n/a	# random UUID and UuidCreateSequential gives a UUID containing the
496	n/a	# hardware address. These routines are provided by the RPC runtime.
497	n/a	# NOTE: at least on Tim's WinXP Pro SP2 desktop box, while the last
498	n/a	# 6 bytes returned by UuidCreateSequential are fixed, they don't appear
499	n/a	# to bear any relationship to the MAC address of any network device
500	n/a	# on the box.
501	n/a	try:
502	n/a	lib = ctypes.windll.rpcrt4
503	n/a	except:
504	n/a	lib = None
505	n/a	_UuidCreate = getattr(lib, 'UuidCreateSequential',
506	n/a	getattr(lib, 'UuidCreate', None))
507	n/a	except:
508	n/a	pass
509	n/a
510	n/a	def _unixdll_getnode():
511	n/a	"""Get the hardware address on Unix using ctypes."""
512	n/a	_buffer = ctypes.create_string_buffer(16)
513	n/a	_uuid_generate_time(_buffer)
514	n/a	return UUID(bytes=bytes_(_buffer.raw)).node
515	n/a
516	n/a	def _windll_getnode():
517	n/a	"""Get the hardware address on Windows using ctypes."""
518	n/a	_buffer = ctypes.create_string_buffer(16)
519	n/a	if _UuidCreate(_buffer) == 0:
520	n/a	return UUID(bytes=bytes_(_buffer.raw)).node
521	n/a
522	n/a	def _random_getnode():
523	n/a	"""Get a random node ID, with eighth bit set as suggested by RFC 4122."""
524	n/a	import random
525	n/a	return random.getrandbits(48) \| 0x010000000000
526	n/a
527	n/a	_node = None
528	n/a
529	n/a	def getnode():
530	n/a	"""Get the hardware address as a 48-bit positive integer.
531	n/a
532	n/a	The first time this runs, it may launch a separate program, which could
533	n/a	be quite slow. If all attempts to obtain the hardware address fail, we
534	n/a	choose a random 48-bit number with its eighth bit set to 1 as recommended
535	n/a	in RFC 4122.
536	n/a	"""
537	n/a
538	n/a	global _node
539	n/a	if _node is not None:
540	n/a	return _node
541	n/a
542	n/a	import sys
543	n/a	if sys.platform == 'win32':
544	n/a	getters = [_windll_getnode, _netbios_getnode, _ipconfig_getnode]
545	n/a	else:
546	n/a	getters = [_unixdll_getnode, _ifconfig_getnode, _ip_getnode,
547	n/a	_arp_getnode, _lanscan_getnode, _netstat_getnode]
548	n/a
549	n/a	for getter in getters + [_random_getnode]:
550	n/a	try:
551	n/a	_node = getter()
552	n/a	except:
553	n/a	continue
554	n/a	if _node is not None:
555	n/a	return _node
556	n/a
557	n/a	_last_timestamp = None
558	n/a
559	n/a	def uuid1(node=None, clock_seq=None):
560	n/a	"""Generate a UUID from a host ID, sequence number, and the current time.
561	n/a	If 'node' is not given, getnode() is used to obtain the hardware
562	n/a	address. If 'clock_seq' is given, it is used as the sequence number;
563	n/a	otherwise a random 14-bit sequence number is chosen."""
564	n/a
565	n/a	# When the system provides a version-1 UUID generator, use it (but don't
566	n/a	# use UuidCreate here because its UUIDs don't conform to RFC 4122).
567	n/a	if _uuid_generate_time and node is clock_seq is None:
568	n/a	_buffer = ctypes.create_string_buffer(16)
569	n/a	_uuid_generate_time(_buffer)
570	n/a	return UUID(bytes=bytes_(_buffer.raw))
571	n/a
572	n/a	global _last_timestamp
573	n/a	import time
574	n/a	nanoseconds = int(time.time() * 1e9)
575	n/a	# 0x01b21dd213814000 is the number of 100-ns intervals between the
576	n/a	# UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
577	n/a	timestamp = int(nanoseconds/100) + 0x01b21dd213814000
578	n/a	if _last_timestamp is not None and timestamp <= _last_timestamp:
579	n/a	timestamp = _last_timestamp + 1
580	n/a	_last_timestamp = timestamp
581	n/a	if clock_seq is None:
582	n/a	import random
583	n/a	clock_seq = random.getrandbits(14) # instead of stable storage
584	n/a	time_low = timestamp & 0xffffffff
585	n/a	time_mid = (timestamp >> 32) & 0xffff
586	n/a	time_hi_version = (timestamp >> 48) & 0x0fff
587	n/a	clock_seq_low = clock_seq & 0xff
588	n/a	clock_seq_hi_variant = (clock_seq >> 8) & 0x3f
589	n/a	if node is None:
590	n/a	node = getnode()
591	n/a	return UUID(fields=(time_low, time_mid, time_hi_version,
592	n/a	clock_seq_hi_variant, clock_seq_low, node), version=1)
593	n/a
594	n/a	def uuid3(namespace, name):
595	n/a	"""Generate a UUID from the MD5 hash of a namespace UUID and a name."""
596	n/a	from hashlib import md5
597	n/a	hash = md5(namespace.bytes + bytes(name, "utf-8")).digest()
598	n/a	return UUID(bytes=hash[:16], version=3)
599	n/a
600	n/a	def uuid4():
601	n/a	"""Generate a random UUID."""
602	n/a	return UUID(bytes=os.urandom(16), version=4)
603	n/a
604	n/a	def uuid5(namespace, name):
605	n/a	"""Generate a UUID from the SHA-1 hash of a namespace UUID and a name."""
606	n/a	from hashlib import sha1
607	n/a	hash = sha1(namespace.bytes + bytes(name, "utf-8")).digest()
608	n/a	return UUID(bytes=hash[:16], version=5)
609	n/a
610	n/a	# The following standard UUIDs are for use with uuid3() or uuid5().
611	n/a
612	n/a	NAMESPACE_DNS = UUID('6ba7b810-9dad-11d1-80b4-00c04fd430c8')
613	n/a	NAMESPACE_URL = UUID('6ba7b811-9dad-11d1-80b4-00c04fd430c8')
614	n/a	NAMESPACE_OID = UUID('6ba7b812-9dad-11d1-80b4-00c04fd430c8')
615	n/a	NAMESPACE_X500 = UUID('6ba7b814-9dad-11d1-80b4-00c04fd430c8')