Source code for dns.rdtypes.ANY.AMTRELAY

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2006, 2007, 2009-2011 Nominum, Inc.
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import struct

import dns.exception
import dns.immutable
import dns.rdtypes.util


class Relay(dns.rdtypes.util.Gateway):
    name = "AMTRELAY relay"

    @property
    def relay(self):
        return self.gateway


[docs] @dns.immutable.immutable class AMTRELAY(dns.rdata.Rdata): """AMTRELAY record""" # see: RFC 8777 __slots__ = ["precedence", "discovery_optional", "relay_type", "relay"] def __init__( self, rdclass, rdtype, precedence, discovery_optional, relay_type, relay ): super().__init__(rdclass, rdtype) relay = Relay(relay_type, relay) self.precedence = self._as_uint8(precedence) self.discovery_optional = self._as_bool(discovery_optional) self.relay_type = relay.type self.relay = relay.relay
[docs] def to_text(self, origin=None, relativize=True, **kw): relay = Relay(self.relay_type, self.relay).to_text(origin, relativize) return "%d %d %d %s" % ( self.precedence, self.discovery_optional, self.relay_type, relay, )
@classmethod def from_text( cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None ): precedence = tok.get_uint8() discovery_optional = tok.get_uint8() if discovery_optional > 1: raise dns.exception.SyntaxError("expecting 0 or 1") discovery_optional = bool(discovery_optional) relay_type = tok.get_uint8() if relay_type > 0x7F: raise dns.exception.SyntaxError("expecting an integer <= 127") relay = Relay.from_text(relay_type, tok, origin, relativize, relativize_to) return cls( rdclass, rdtype, precedence, discovery_optional, relay_type, relay.relay ) def _to_wire(self, file, compress=None, origin=None, canonicalize=False): relay_type = self.relay_type | (self.discovery_optional << 7) header = struct.pack("!BB", self.precedence, relay_type) file.write(header) Relay(self.relay_type, self.relay).to_wire(file, compress, origin, canonicalize) @classmethod def from_wire_parser(cls, rdclass, rdtype, parser, origin=None): (precedence, relay_type) = parser.get_struct("!BB") discovery_optional = bool(relay_type >> 7) relay_type &= 0x7F relay = Relay.from_wire_parser(relay_type, parser, origin) return cls( rdclass, rdtype, precedence, discovery_optional, relay_type, relay.relay )