+++ /dev/null
-# Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc.
-#
-# Permission to use, copy, modify, and distribute this software and its
-# documentation for any purpose with or without fee is hereby granted,
-# provided that the above copyright notice and this permission notice
-# appear in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
-# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
-"""IPv6 helper functions."""
-
-import re
-
-import dns.exception
-import dns.ipv4
-
-_leading_zero = re.compile(r'0+([0-9a-f]+)')
-
-def inet_ntoa(address):
- """Convert a network format IPv6 address into text.
-
- @param address: the binary address
- @type address: string
- @rtype: string
- @raises ValueError: the address isn't 16 bytes long
- """
-
- if len(address) != 16:
- raise ValueError("IPv6 addresses are 16 bytes long")
- hex = address.encode('hex_codec')
- chunks = []
- i = 0
- l = len(hex)
- while i < l:
- chunk = hex[i : i + 4]
- # strip leading zeros. we do this with an re instead of
- # with lstrip() because lstrip() didn't support chars until
- # python 2.2.2
- m = _leading_zero.match(chunk)
- if not m is None:
- chunk = m.group(1)
- chunks.append(chunk)
- i += 4
- #
- # Compress the longest subsequence of 0-value chunks to ::
- #
- best_start = 0
- best_len = 0
- start = -1
- last_was_zero = False
- for i in xrange(8):
- if chunks[i] != '0':
- if last_was_zero:
- end = i
- current_len = end - start
- if current_len > best_len:
- best_start = start
- best_len = current_len
- last_was_zero = False
- elif not last_was_zero:
- start = i
- last_was_zero = True
- if last_was_zero:
- end = 8
- current_len = end - start
- if current_len > best_len:
- best_start = start
- best_len = current_len
- if best_len > 0:
- if best_start == 0 and \
- (best_len == 6 or
- best_len == 5 and chunks[5] == 'ffff'):
- # We have an embedded IPv4 address
- if best_len == 6:
- prefix = '::'
- else:
- prefix = '::ffff:'
- hex = prefix + dns.ipv4.inet_ntoa(address[12:])
- else:
- hex = ':'.join(chunks[:best_start]) + '::' + \
- ':'.join(chunks[best_start + best_len:])
- else:
- hex = ':'.join(chunks)
- return hex
-
-_v4_ending = re.compile(r'(.*):(\d+)\.(\d+)\.(\d+)\.(\d+)$')
-_colon_colon_start = re.compile(r'::.*')
-_colon_colon_end = re.compile(r'.*::$')
-
-def inet_aton(text):
- """Convert a text format IPv6 address into network format.
-
- @param text: the textual address
- @type text: string
- @rtype: string
- @raises dns.exception.SyntaxError: the text was not properly formatted
- """
-
- #
- # Our aim here is not something fast; we just want something that works.
- #
-
- if text == '::':
- text = '0::'
- #
- # Get rid of the icky dot-quad syntax if we have it.
- #
- m = _v4_ending.match(text)
- if not m is None:
- text = "%s:%04x:%04x" % (m.group(1),
- int(m.group(2)) * 256 + int(m.group(3)),
- int(m.group(4)) * 256 + int(m.group(5)))
- #
- # Try to turn '::<whatever>' into ':<whatever>'; if no match try to
- # turn '<whatever>::' into '<whatever>:'
- #
- m = _colon_colon_start.match(text)
- if not m is None:
- text = text[1:]
- else:
- m = _colon_colon_end.match(text)
- if not m is None:
- text = text[:-1]
- #
- # Now canonicalize into 8 chunks of 4 hex digits each
- #
- chunks = text.split(':')
- l = len(chunks)
- if l > 8:
- raise dns.exception.SyntaxError
- seen_empty = False
- canonical = []
- for c in chunks:
- if c == '':
- if seen_empty:
- raise dns.exception.SyntaxError
- seen_empty = True
- for i in xrange(0, 8 - l + 1):
- canonical.append('0000')
- else:
- lc = len(c)
- if lc > 4:
- raise dns.exception.SyntaxError
- if lc != 4:
- c = ('0' * (4 - lc)) + c
- canonical.append(c)
- if l < 8 and not seen_empty:
- raise dns.exception.SyntaxError
- text = ''.join(canonical)
-
- #
- # Finally we can go to binary.
- #
- try:
- return text.decode('hex_codec')
- except TypeError:
- raise dns.exception.SyntaxError
git.samba.org / samba.git / blobdiff