mirror of https://github.com/morpheus65535/bazarr
112 lines
4.0 KiB
Python
112 lines
4.0 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2004-2017 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 base64
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import binascii
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import struct
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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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import dns.rdatatype
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import dns.rdtypes.util
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b32_hex_to_normal = bytes.maketrans(b'0123456789ABCDEFGHIJKLMNOPQRSTUV',
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b'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567')
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b32_normal_to_hex = bytes.maketrans(b'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567',
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b'0123456789ABCDEFGHIJKLMNOPQRSTUV')
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# hash algorithm constants
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SHA1 = 1
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# flag constants
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OPTOUT = 1
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@dns.immutable.immutable
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class Bitmap(dns.rdtypes.util.Bitmap):
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type_name = 'NSEC3'
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@dns.immutable.immutable
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class NSEC3(dns.rdata.Rdata):
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"""NSEC3 record"""
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__slots__ = ['algorithm', 'flags', 'iterations', 'salt', 'next', 'windows']
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def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt,
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next, windows):
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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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self.next = self._as_bytes(next, True, 255)
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if not isinstance(windows, Bitmap):
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windows = Bitmap(windows)
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self.windows = tuple(windows.windows)
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def to_text(self, origin=None, relativize=True, **kw):
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next = base64.b32encode(self.next).translate(
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b32_normal_to_hex).lower().decode()
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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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text = Bitmap(self.windows).to_text()
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return '%u %u %u %s %s%s' % (self.algorithm, self.flags,
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self.iterations, salt, next, text)
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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 = b''
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else:
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salt = binascii.unhexlify(salt.encode('ascii'))
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next = tok.get_string().encode(
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'ascii').upper().translate(b32_hex_to_normal)
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next = base64.b32decode(next)
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bitmap = Bitmap.from_text(tok)
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return cls(rdclass, rdtype, algorithm, flags, iterations, salt, next,
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bitmap)
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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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l = len(self.next)
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file.write(struct.pack("!B", l))
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file.write(self.next)
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Bitmap(self.windows).to_wire(file)
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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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next = parser.get_counted_bytes()
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bitmap = Bitmap.from_wire_parser(parser)
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return cls(rdclass, rdtype, algorithm, flags, iterations, salt, next,
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bitmap)
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