mirror of https://github.com/morpheus65535/bazarr
87 lines
3.4 KiB
Python
87 lines
3.4 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2006, 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 dns.exception
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import dns.immutable
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import dns.rdtypes.util
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class Relay(dns.rdtypes.util.Gateway):
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name = 'AMTRELAY relay'
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@property
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def relay(self):
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return self.gateway
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@dns.immutable.immutable
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class AMTRELAY(dns.rdata.Rdata):
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"""AMTRELAY record"""
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# see: RFC 8777
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__slots__ = ['precedence', 'discovery_optional', 'relay_type', 'relay']
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def __init__(self, rdclass, rdtype, precedence, discovery_optional,
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relay_type, relay):
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super().__init__(rdclass, rdtype)
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relay = Relay(relay_type, relay)
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self.precedence = self._as_uint8(precedence)
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self.discovery_optional = self._as_bool(discovery_optional)
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self.relay_type = relay.type
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self.relay = relay.relay
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def to_text(self, origin=None, relativize=True, **kw):
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relay = Relay(self.relay_type, self.relay).to_text(origin, relativize)
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return '%d %d %d %s' % (self.precedence, self.discovery_optional,
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self.relay_type, relay)
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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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precedence = tok.get_uint8()
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discovery_optional = tok.get_uint8()
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if discovery_optional > 1:
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raise dns.exception.SyntaxError('expecting 0 or 1')
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discovery_optional = bool(discovery_optional)
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relay_type = tok.get_uint8()
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if relay_type > 0x7f:
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raise dns.exception.SyntaxError('expecting an integer <= 127')
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relay = Relay.from_text(relay_type, tok, origin, relativize,
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relativize_to)
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return cls(rdclass, rdtype, precedence, discovery_optional, relay_type,
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relay.relay)
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def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
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relay_type = self.relay_type | (self.discovery_optional << 7)
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header = struct.pack("!BB", self.precedence, relay_type)
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file.write(header)
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Relay(self.relay_type, self.relay).to_wire(file, compress, origin,
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canonicalize)
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@classmethod
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def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
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(precedence, relay_type) = parser.get_struct('!BB')
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discovery_optional = bool(relay_type >> 7)
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relay_type &= 0x7f
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relay = Relay.from_wire_parser(relay_type, parser, origin)
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return cls(rdclass, rdtype, precedence, discovery_optional, relay_type,
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relay.relay)
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