1 # Copyright (C) 2004-2007, 2009, 2010 Nominum, Inc.
3 # Permission to use, copy, modify, and distribute this software and its
4 # documentation for any purpose with or without fee is hereby granted,
5 # provided that the above copyright notice and this permission notice
6 # appear in all copies.
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9 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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14 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 class NSEC3PARAM(dns.rdata.Rdata):
25 @ivar algorithm: the hash algorithm number
27 @ivar flags: the flags
29 @ivar iterations: the number of iterations
34 __slots__ = ['algorithm', 'flags', 'iterations', 'salt']
36 def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt):
37 super(NSEC3PARAM, self).__init__(rdclass, rdtype)
38 self.algorithm = algorithm
40 self.iterations = iterations
43 def to_text(self, origin=None, relativize=True, **kw):
47 salt = self.salt.encode('hex-codec')
48 return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations, salt)
50 def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
51 algorithm = tok.get_uint8()
52 flags = tok.get_uint8()
53 iterations = tok.get_uint16()
54 salt = tok.get_string()
58 salt = salt.decode('hex-codec')
59 return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
61 from_text = classmethod(from_text)
63 def to_wire(self, file, compress = None, origin = None):
65 file.write(struct.pack("!BBHB", self.algorithm, self.flags,
69 def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
70 (algorithm, flags, iterations, slen) = struct.unpack('!BBHB',
71 wire[current : current + 5])
74 salt = wire[current : current + slen]
78 raise dns.exception.FormError
79 return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
81 from_wire = classmethod(from_wire)
83 def _cmp(self, other):
84 b1 = cStringIO.StringIO()
86 b2 = cStringIO.StringIO()
88 return cmp(b1.getvalue(), b2.getvalue())