Your IP : 18.118.28.160
# Copyright (C) 2015 Red Hat, Inc.
# Author: Petr Spacek <pspacek@redhat.com>
#
# 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 RED HAT 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.
import binascii
import dns.rdata
from dns._compat import xrange
class EUIBase(dns.rdata.Rdata):
"""EUIxx record
@ivar fingerprint: xx-bit Extended Unique Identifier (EUI-xx)
@type fingerprint: string
@see: rfc7043.txt"""
__slots__ = ['eui']
# define these in subclasses
# byte_len = 6 # 0123456789ab (in hex)
# text_len = byte_len * 3 - 1 # 01-23-45-67-89-ab
def __init__(self, rdclass, rdtype, eui):
super(EUIBase, self).__init__(rdclass, rdtype)
if len(eui) != self.byte_len:
raise dns.exception.FormError('EUI%s rdata has to have %s bytes'
% (self.byte_len * 8, self.byte_len))
self.eui = eui
def to_text(self, origin=None, relativize=True, **kw):
return dns.rdata._hexify(self.eui, chunksize=2).replace(' ', '-')
@classmethod
def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
text = tok.get_string()
tok.get_eol()
if len(text) != cls.text_len:
raise dns.exception.SyntaxError(
'Input text must have %s characters' % cls.text_len)
expected_dash_idxs = xrange(2, cls.byte_len * 3 - 1, 3)
for i in expected_dash_idxs:
if text[i] != '-':
raise dns.exception.SyntaxError('Dash expected at position %s'
% i)
text = text.replace('-', '')
try:
data = binascii.unhexlify(text.encode())
except (ValueError, TypeError) as ex:
raise dns.exception.SyntaxError('Hex decoding error: %s' % str(ex))
return cls(rdclass, rdtype, data)
def to_wire(self, file, compress=None, origin=None):
file.write(self.eui)
@classmethod
def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
eui = wire[current:current + rdlen].unwrap()
return cls(rdclass, rdtype, eui)