274 lines
7.5 KiB
Python
274 lines
7.5 KiB
Python
#-----------------------------------------------------------------------------
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# Copyright (c) 2008 by David P. D. Moss. All rights reserved.
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#
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# Released under the BSD license. See the LICENSE file for details.
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#-----------------------------------------------------------------------------
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"""
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IEEE 64-bit EUI (Extended Unique Indentifier) logic.
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"""
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import struct as _struct
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import re as _re
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from netaddr.core import AddrFormatError
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from netaddr.strategy import (
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valid_words as _valid_words, int_to_words as _int_to_words,
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words_to_int as _words_to_int, valid_bits as _valid_bits,
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bits_to_int as _bits_to_int, int_to_bits as _int_to_bits,
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valid_bin as _valid_bin, int_to_bin as _int_to_bin,
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bin_to_int as _bin_to_int)
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# This is a fake constant that doesn't really exist. Here for completeness.
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AF_EUI64 = 64
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#: The width (in bits) of this address type.
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width = 64
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#: The AF_* constant value of this address type.
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family = AF_EUI64
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#: A friendly string name address type.
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family_name = 'EUI-64'
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#: The version of this address type.
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version = 64
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#: The maximum integer value that can be represented by this address type.
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max_int = 2 ** width - 1
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#-----------------------------------------------------------------------------
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# Dialect classes.
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#-----------------------------------------------------------------------------
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class eui64_base(object):
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"""A standard IEEE EUI-64 dialect class."""
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#: The individual word size (in bits) of this address type.
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word_size = 8
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#: The number of words in this address type.
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num_words = width // word_size
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#: The maximum integer value for an individual word in this address type.
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max_word = 2 ** word_size - 1
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#: The separator character used between each word.
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word_sep = '-'
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#: The format string to be used when converting words to string values.
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word_fmt = '%.2X'
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#: The number base to be used when interpreting word values as integers.
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word_base = 16
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class eui64_unix(eui64_base):
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"""A UNIX-style MAC address dialect class."""
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word_size = 8
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num_words = width // word_size
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word_sep = ':'
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word_fmt = '%x'
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word_base = 16
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class eui64_unix_expanded(eui64_unix):
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"""A UNIX-style MAC address dialect class with leading zeroes."""
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word_fmt = '%.2x'
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class eui64_cisco(eui64_base):
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"""A Cisco 'triple hextet' MAC address dialect class."""
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word_size = 16
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num_words = width // word_size
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word_sep = '.'
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word_fmt = '%.4x'
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word_base = 16
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class eui64_bare(eui64_base):
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"""A bare (no delimiters) MAC address dialect class."""
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word_size = 64
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num_words = width // word_size
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word_sep = ''
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word_fmt = '%.16X'
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word_base = 16
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#: The default dialect to be used when not specified by the user.
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DEFAULT_EUI64_DIALECT = eui64_base
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#-----------------------------------------------------------------------------
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#: Regular expressions to match all supported MAC address formats.
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RE_EUI64_FORMATS = (
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# 2 bytes x 8 (UNIX, Windows, EUI-64)
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'^' + ':'.join(['([0-9A-F]{1,2})'] * 8) + '$',
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'^' + '-'.join(['([0-9A-F]{1,2})'] * 8) + '$',
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# 4 bytes x 4 (Cisco like)
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'^' + ':'.join(['([0-9A-F]{1,4})'] * 4) + '$',
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'^' + '-'.join(['([0-9A-F]{1,4})'] * 4) + '$',
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'^' + r'\.'.join(['([0-9A-F]{1,4})'] * 4) + '$',
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# 16 bytes (bare, no delimiters)
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'^(' + ''.join(['[0-9A-F]'] * 16) + ')$',
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)
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# For efficiency, each string regexp converted in place to its compiled
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# counterpart.
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RE_EUI64_FORMATS = [_re.compile(_, _re.IGNORECASE) for _ in RE_EUI64_FORMATS]
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def _get_match_result(address, formats):
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for regexp in formats:
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match = regexp.findall(address)
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if match:
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return match[0]
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def valid_str(addr):
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"""
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:param addr: An IEEE EUI-64 indentifier in string form.
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:return: ``True`` if EUI-64 indentifier is valid, ``False`` otherwise.
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"""
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try:
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if _get_match_result(addr, RE_EUI64_FORMATS):
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return True
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except TypeError:
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pass
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return False
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def str_to_int(addr):
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"""
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:param addr: An IEEE EUI-64 indentifier in string form.
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:return: An unsigned integer that is equivalent to value represented
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by EUI-64 string address formatted according to the dialect
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"""
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words = []
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try:
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words = _get_match_result(addr, RE_EUI64_FORMATS)
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if not words:
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raise TypeError
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except TypeError:
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raise AddrFormatError('invalid IEEE EUI-64 identifier: %r!' % (addr,))
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if isinstance(words, tuple):
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pass
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else:
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words = (words,)
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if len(words) == 8:
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# 2 bytes x 8 (UNIX, Windows, EUI-48)
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int_val = int(''.join(['%.2x' % int(w, 16) for w in words]), 16)
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elif len(words) == 4:
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# 4 bytes x 4 (Cisco like)
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int_val = int(''.join(['%.4x' % int(w, 16) for w in words]), 16)
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elif len(words) == 1:
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# 16 bytes (bare, no delimiters)
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int_val = int('%016x' % int(words[0], 16), 16)
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else:
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raise AddrFormatError(
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'bad word count for EUI-64 identifier: %r!' % addr)
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return int_val
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def int_to_str(int_val, dialect=None):
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"""
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:param int_val: An unsigned integer.
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:param dialect: (optional) a Python class defining formatting options
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:return: An IEEE EUI-64 identifier that is equivalent to unsigned integer.
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"""
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if dialect is None:
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dialect = eui64_base
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words = int_to_words(int_val, dialect)
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tokens = [dialect.word_fmt % i for i in words]
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addr = dialect.word_sep.join(tokens)
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return addr
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def int_to_packed(int_val):
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"""
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:param int_val: the integer to be packed.
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:return: a packed string that is equivalent to value represented by an
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unsigned integer.
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"""
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words = int_to_words(int_val)
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return _struct.pack('>8B', *words)
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def packed_to_int(packed_int):
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"""
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:param packed_int: a packed string containing an unsigned integer.
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It is assumed that string is packed in network byte order.
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:return: An unsigned integer equivalent to value of network address
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represented by packed binary string.
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"""
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words = list(_struct.unpack('>8B', packed_int))
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int_val = 0
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for i, num in enumerate(reversed(words)):
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word = num
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word = word << 8 * i
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int_val = int_val | word
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return int_val
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def valid_words(words, dialect=None):
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if dialect is None:
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dialect = DEFAULT_EUI64_DIALECT
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return _valid_words(words, dialect.word_size, dialect.num_words)
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def int_to_words(int_val, dialect=None):
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if dialect is None:
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dialect = DEFAULT_EUI64_DIALECT
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return _int_to_words(int_val, dialect.word_size, dialect.num_words)
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def words_to_int(words, dialect=None):
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if dialect is None:
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dialect = DEFAULT_EUI64_DIALECT
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return _words_to_int(words, dialect.word_size, dialect.num_words)
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def valid_bits(bits, dialect=None):
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if dialect is None:
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dialect = DEFAULT_EUI64_DIALECT
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return _valid_bits(bits, width, dialect.word_sep)
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def bits_to_int(bits, dialect=None):
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if dialect is None:
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dialect = DEFAULT_EUI64_DIALECT
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return _bits_to_int(bits, width, dialect.word_sep)
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def int_to_bits(int_val, dialect=None):
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if dialect is None:
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dialect = DEFAULT_EUI64_DIALECT
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return _int_to_bits(
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int_val, dialect.word_size, dialect.num_words, dialect.word_sep)
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def valid_bin(bin_val, dialect=None):
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if dialect is None:
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dialect = DEFAULT_EUI64_DIALECT
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return _valid_bin(bin_val, width)
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def int_to_bin(int_val):
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return _int_to_bin(int_val, width)
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def bin_to_int(bin_val):
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return _bin_to_int(bin_val, width)
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