1# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
2
3# Copyright (C) 2003-2007, 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 binascii
19
20import dns.exception
21import dns.rdata
22import dns.tokenizer
23
24
25class NSAP(dns.rdata.Rdata):
26
27    """NSAP record."""
28
29    # see: RFC 1706
30
31    __slots__ = ['address']
32
33    def __init__(self, rdclass, rdtype, address):
34        super().__init__(rdclass, rdtype)
35        object.__setattr__(self, 'address', address)
36
37    def to_text(self, origin=None, relativize=True, **kw):
38        return "0x%s" % binascii.hexlify(self.address).decode()
39
40    @classmethod
41    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
42                  relativize_to=None):
43        address = tok.get_string()
44        tok.get_eol()
45        if address[0:2] != '0x':
46            raise dns.exception.SyntaxError('string does not start with 0x')
47        address = address[2:].replace('.', '')
48        if len(address) % 2 != 0:
49            raise dns.exception.SyntaxError('hexstring has odd length')
50        address = binascii.unhexlify(address.encode())
51        return cls(rdclass, rdtype, address)
52
53    def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
54        file.write(self.address)
55
56    @classmethod
57    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
58        address = parser.get_remaining()
59        return cls(rdclass, rdtype, address)
60