1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 import struct
17
18 import dns.rdata
19 import dns.rdatatype
20
22 """Base class for rdata that is like a DS record
23
24 @ivar key_tag: the key tag
25 @type key_tag: int
26 @ivar algorithm: the algorithm
27 @type algorithm: int
28 @ivar digest_type: the digest type
29 @type digest_type: int
30 @ivar digest: the digest
31 @type digest: int
32 @see: draft-ietf-dnsext-delegation-signer-14.txt"""
33
34 __slots__ = ['key_tag', 'algorithm', 'digest_type', 'digest']
35
36 - def __init__(self, rdclass, rdtype, key_tag, algorithm, digest_type,
37 digest):
43
44 - def to_text(self, origin=None, relativize=True, **kw):
45 return '%d %d %d %s' % (self.key_tag, self.algorithm,
46 self.digest_type,
47 dns.rdata._hexify(self.digest,
48 chunksize=128))
49
50 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
51 key_tag = tok.get_uint16()
52 algorithm = tok.get_uint8()
53 digest_type = tok.get_uint8()
54 chunks = []
55 while 1:
56 t = tok.get().unescape()
57 if t.is_eol_or_eof():
58 break
59 if not t.is_identifier():
60 raise dns.exception.SyntaxError
61 chunks.append(t.value)
62 digest = ''.join(chunks)
63 digest = digest.decode('hex_codec')
64 return cls(rdclass, rdtype, key_tag, algorithm, digest_type,
65 digest)
66
67 from_text = classmethod(from_text)
68
69 - def to_wire(self, file, compress = None, origin = None):
74
75 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
76 header = struct.unpack("!HBB", wire[current : current + 4])
77 current += 4
78 rdlen -= 4
79 digest = wire[current : current + rdlen].unwrap()
80 return cls(rdclass, rdtype, header[0], header[1], header[2], digest)
81
82 from_wire = classmethod(from_wire)
83
84 - def _cmp(self, other):
93