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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2004-2007, 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.
import dns.exception
import dns.immutable
import dns.rdata
import dns.rdatatype
import dns.name
import dns.rdtypes.util
@dns.immutable.immutable
class Bitmap(dns.rdtypes.util.Bitmap):
type_name = 'NSEC'
@dns.immutable.immutable
class NSEC(dns.rdata.Rdata):
"""NSEC record"""
__slots__ = ['next', 'windows']
def __init__(self, rdclass, rdtype, next, windows):
super().__init__(rdclass, rdtype)
self.next = self._as_name(next)
if not isinstance(windows, Bitmap):
windows = Bitmap(windows)
self.windows = tuple(windows.windows)
def to_text(self, origin=None, relativize=True, **kw):
next = self.next.choose_relativity(origin, relativize)
text = Bitmap(self.windows).to_text()
return '{}{}'.format(next, text)
@classmethod
def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
relativize_to=None):
next = tok.get_name(origin, relativize, relativize_to)
windows = Bitmap.from_text(tok)
return cls(rdclass, rdtype, next, windows)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
# Note that NSEC downcasing, originally mandated by RFC 4034
# section 6.2 was removed by RFC 6840 section 5.1.
self.next.to_wire(file, None, origin, False)
Bitmap(self.windows).to_wire(file)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
next = parser.get_name(origin)
bitmap = Bitmap.from_wire_parser(parser)
return cls(rdclass, rdtype, next, bitmap)
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