mirror of https://github.com/morpheus65535/bazarr
125 lines
4.6 KiB
Python
125 lines
4.6 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 base64
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import calendar
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import struct
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import time
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import dns.dnssec
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import dns.immutable
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import dns.exception
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import dns.rdata
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import dns.rdatatype
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class BadSigTime(dns.exception.DNSException):
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"""Time in DNS SIG or RRSIG resource record cannot be parsed."""
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def sigtime_to_posixtime(what):
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if len(what) <= 10 and what.isdigit():
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return int(what)
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if len(what) != 14:
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raise BadSigTime
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year = int(what[0:4])
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month = int(what[4:6])
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day = int(what[6:8])
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hour = int(what[8:10])
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minute = int(what[10:12])
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second = int(what[12:14])
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return calendar.timegm((year, month, day, hour, minute, second,
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0, 0, 0))
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def posixtime_to_sigtime(what):
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return time.strftime('%Y%m%d%H%M%S', time.gmtime(what))
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@dns.immutable.immutable
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class RRSIG(dns.rdata.Rdata):
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"""RRSIG record"""
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__slots__ = ['type_covered', 'algorithm', 'labels', 'original_ttl',
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'expiration', 'inception', 'key_tag', 'signer',
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'signature']
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def __init__(self, rdclass, rdtype, type_covered, algorithm, labels,
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original_ttl, expiration, inception, key_tag, signer,
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signature):
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super().__init__(rdclass, rdtype)
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self.type_covered = self._as_rdatatype(type_covered)
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self.algorithm = dns.dnssec.Algorithm.make(algorithm)
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self.labels = self._as_uint8(labels)
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self.original_ttl = self._as_ttl(original_ttl)
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self.expiration = self._as_uint32(expiration)
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self.inception = self._as_uint32(inception)
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self.key_tag = self._as_uint16(key_tag)
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self.signer = self._as_name(signer)
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self.signature = self._as_bytes(signature)
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def covers(self):
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return self.type_covered
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def to_text(self, origin=None, relativize=True, **kw):
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return '%s %d %d %d %s %s %d %s %s' % (
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dns.rdatatype.to_text(self.type_covered),
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self.algorithm,
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self.labels,
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self.original_ttl,
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posixtime_to_sigtime(self.expiration),
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posixtime_to_sigtime(self.inception),
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self.key_tag,
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self.signer.choose_relativity(origin, relativize),
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dns.rdata._base64ify(self.signature, **kw)
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)
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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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type_covered = dns.rdatatype.from_text(tok.get_string())
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algorithm = dns.dnssec.algorithm_from_text(tok.get_string())
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labels = tok.get_int()
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original_ttl = tok.get_ttl()
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expiration = sigtime_to_posixtime(tok.get_string())
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inception = sigtime_to_posixtime(tok.get_string())
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key_tag = tok.get_int()
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signer = tok.get_name(origin, relativize, relativize_to)
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b64 = tok.concatenate_remaining_identifiers().encode()
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signature = base64.b64decode(b64)
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return cls(rdclass, rdtype, type_covered, algorithm, labels,
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original_ttl, expiration, inception, key_tag, signer,
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signature)
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def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
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header = struct.pack('!HBBIIIH', self.type_covered,
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self.algorithm, self.labels,
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self.original_ttl, self.expiration,
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self.inception, self.key_tag)
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file.write(header)
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self.signer.to_wire(file, None, origin, canonicalize)
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file.write(self.signature)
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@classmethod
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def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
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header = parser.get_struct('!HBBIIIH')
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signer = parser.get_name(origin)
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signature = parser.get_remaining()
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return cls(rdclass, rdtype, *header, signer, signature)
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