1# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
2
3# Copyright (C) 2006, 2007, 2009-2011 Nominum, Inc.
4#
5# Permission to use, copy, modify, and distribute this software and its
6# documentation for any purpose with or without fee is hereby granted,
7# provided that the above copyright notice and this permission notice
8# appear in all copies.
9#
10# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
16# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
18import struct
19import base64
20
21import dns.exception
22import dns.rdtypes.util
23
24
25class Gateway(dns.rdtypes.util.Gateway):
26    name = 'IPSECKEY gateway'
27
28class IPSECKEY(dns.rdata.Rdata):
29
30    """IPSECKEY record"""
31
32    # see: RFC 4025
33
34    __slots__ = ['precedence', 'gateway_type', 'algorithm', 'gateway', 'key']
35
36    def __init__(self, rdclass, rdtype, precedence, gateway_type, algorithm,
37                 gateway, key):
38        super().__init__(rdclass, rdtype)
39        Gateway(gateway_type, gateway).check()
40        object.__setattr__(self, 'precedence', precedence)
41        object.__setattr__(self, 'gateway_type', gateway_type)
42        object.__setattr__(self, 'algorithm', algorithm)
43        object.__setattr__(self, 'gateway', gateway)
44        object.__setattr__(self, 'key', key)
45
46    def to_text(self, origin=None, relativize=True, **kw):
47        gateway = Gateway(self.gateway_type, self.gateway).to_text(origin,
48                                                                   relativize)
49        return '%d %d %d %s %s' % (self.precedence, self.gateway_type,
50                                   self.algorithm, gateway,
51                                   dns.rdata._base64ify(self.key))
52
53    @classmethod
54    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
55                  relativize_to=None):
56        precedence = tok.get_uint8()
57        gateway_type = tok.get_uint8()
58        algorithm = tok.get_uint8()
59        gateway = Gateway(gateway_type).from_text(tok, origin, relativize,
60                                                  relativize_to)
61        b64 = tok.concatenate_remaining_identifiers().encode()
62        key = base64.b64decode(b64)
63        return cls(rdclass, rdtype, precedence, gateway_type, algorithm,
64                   gateway, key)
65
66    def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
67        header = struct.pack("!BBB", self.precedence, self.gateway_type,
68                             self.algorithm)
69        file.write(header)
70        Gateway(self.gateway_type, self.gateway).to_wire(file, compress,
71                                                         origin, canonicalize)
72        file.write(self.key)
73
74    @classmethod
75    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
76        header = parser.get_struct('!BBB')
77        gateway_type = header[1]
78        gateway = Gateway(gateway_type).from_wire_parser(parser, origin)
79        key = parser.get_remaining()
80        return cls(rdclass, rdtype, header[0], gateway_type, header[2],
81                   gateway, key)
82