# 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 binascii import struct import dns.exception import dns.immutable import dns.rdata @dns.immutable.immutable class NSEC3PARAM(dns.rdata.Rdata): """NSEC3PARAM record""" __slots__ = ["algorithm", "flags", "iterations", "salt"] def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt): super().__init__(rdclass, rdtype) self.algorithm = self._as_uint8(algorithm) self.flags = self._as_uint8(flags) self.iterations = self._as_uint16(iterations) self.salt = self._as_bytes(salt, True, 255) def to_text(self, origin=None, relativize=True, **kw): if self.salt == b"": salt = "-" else: salt = binascii.hexlify(self.salt).decode() return "%u %u %u %s" % (self.algorithm, self.flags, self.iterations, salt) @classmethod def from_text( cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None ): algorithm = tok.get_uint8() flags = tok.get_uint8() iterations = tok.get_uint16() salt = tok.get_string() if salt == "-": salt = "" else: salt = binascii.unhexlify(salt.encode()) return cls(rdclass, rdtype, algorithm, flags, iterations, salt) def _to_wire(self, file, compress=None, origin=None, canonicalize=False): l = len(self.salt) file.write(struct.pack("!BBHB", self.algorithm, self.flags, self.iterations, l)) file.write(self.salt) @classmethod def from_wire_parser(cls, rdclass, rdtype, parser, origin=None): (algorithm, flags, iterations) = parser.get_struct("!BBH") salt = parser.get_counted_bytes() return cls(rdclass, rdtype, algorithm, flags, iterations, salt)