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# Copyright (C) 2010 Nominum, Inc.
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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class DSBase(dns.rdata.Rdata):
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"""Base class for rdata that is like a DS record
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@ivar key_tag: the key tag
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@ivar algorithm: the algorithm
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@ivar digest_type: the digest type
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@type digest_type: int
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@ivar digest: the digest
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@see: draft-ietf-dnsext-delegation-signer-14.txt"""
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__slots__ = ['key_tag', 'algorithm', 'digest_type', 'digest']
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def __init__(self, rdclass, rdtype, key_tag, algorithm, digest_type,
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super(DSBase, self).__init__(rdclass, rdtype)
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self.key_tag = key_tag
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self.algorithm = algorithm
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self.digest_type = digest_type
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def to_text(self, origin=None, relativize=True, **kw):
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return '%d %d %d %s' % (self.key_tag, self.algorithm,
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dns.rdata._hexify(self.digest,
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def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
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key_tag = tok.get_uint16()
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algorithm = tok.get_uint8()
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digest_type = tok.get_uint8()
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t = tok.get().unescape()
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if not t.is_identifier():
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raise dns.exception.SyntaxError
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chunks.append(t.value)
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digest = ''.join(chunks)
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digest = digest.decode('hex_codec')
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return cls(rdclass, rdtype, key_tag, algorithm, digest_type,
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from_text = classmethod(from_text)
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def to_wire(self, file, compress = None, origin = None):
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header = struct.pack("!HBB", self.key_tag, self.algorithm,
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file.write(self.digest)
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def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
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header = struct.unpack("!HBB", wire[current : current + 4])
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digest = wire[current : current + rdlen]
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return cls(rdclass, rdtype, header[0], header[1], header[2], digest)
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from_wire = classmethod(from_wire)
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def _cmp(self, other):
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hs = struct.pack("!HBB", self.key_tag, self.algorithm,
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ho = struct.pack("!HBB", other.key_tag, other.algorithm,
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v = cmp(self.digest, other.digest)