diff options
Diffstat (limited to 'third_party/dnspython/dns/ipv6.py')
| -rw-r--r-- | third_party/dnspython/dns/ipv6.py | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/third_party/dnspython/dns/ipv6.py b/third_party/dnspython/dns/ipv6.py deleted file mode 100644 index 69db34a7dea..00000000000 --- a/third_party/dnspython/dns/ipv6.py +++ /dev/null @@ -1,163 +0,0 @@ -# Copyright (C) 2003-2007, 2009-2011 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: - b = dns.ipv4.inet_aton(m.group(2)) - text = "%s:%02x%02x:%02x%02x" % (m.group(1), ord(b[0]), ord(b[1]), - ord(b[2]), ord(b[3])) - # - # 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 |