mirror of https://github.com/morpheus65535/bazarr
72 lines
2.6 KiB
Python
72 lines
2.6 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2004-2007, 2009-2011 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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import struct
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import binascii
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import dns.exception
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import dns.immutable
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import dns.rdata
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@dns.immutable.immutable
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class NSEC3PARAM(dns.rdata.Rdata):
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"""NSEC3PARAM record"""
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__slots__ = ['algorithm', 'flags', 'iterations', 'salt']
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def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt):
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super().__init__(rdclass, rdtype)
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self.algorithm = self._as_uint8(algorithm)
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self.flags = self._as_uint8(flags)
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self.iterations = self._as_uint16(iterations)
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self.salt = self._as_bytes(salt, True, 255)
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def to_text(self, origin=None, relativize=True, **kw):
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if self.salt == b'':
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salt = '-'
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else:
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salt = binascii.hexlify(self.salt).decode()
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return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations,
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salt)
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@classmethod
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def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
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relativize_to=None):
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algorithm = tok.get_uint8()
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flags = tok.get_uint8()
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iterations = tok.get_uint16()
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salt = tok.get_string()
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if salt == '-':
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salt = ''
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else:
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salt = binascii.unhexlify(salt.encode())
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return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
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def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
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l = len(self.salt)
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file.write(struct.pack("!BBHB", self.algorithm, self.flags,
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self.iterations, l))
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file.write(self.salt)
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@classmethod
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def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
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(algorithm, flags, iterations) = parser.get_struct('!BBH')
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salt = parser.get_counted_bytes()
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return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
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