| # Copyright (C) 2004-2007, 2009, 2010 Nominum, Inc. |
| # |
| # Permission to use, copy, modify, and distribute this software and its |
| # documentation for any purpose with or without fee is hereby granted, |
| # provided that the above copyright notice and this permission notice |
| # appear in all copies. |
| # |
| # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES |
| # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR |
| # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| import cStringIO |
| import struct |
| |
| import dns.exception |
| import dns.rdata |
| |
| class NSEC3PARAM(dns.rdata.Rdata): |
| """NSEC3PARAM record |
| |
| @ivar algorithm: the hash algorithm number |
| @type algorithm: int |
| @ivar flags: the flags |
| @type flags: int |
| @ivar iterations: the number of iterations |
| @type iterations: int |
| @ivar salt: the salt |
| @type salt: string""" |
| |
| __slots__ = ['algorithm', 'flags', 'iterations', 'salt'] |
| |
| def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt): |
| super(NSEC3PARAM, self).__init__(rdclass, rdtype) |
| self.algorithm = algorithm |
| self.flags = flags |
| self.iterations = iterations |
| self.salt = salt |
| |
| def to_text(self, origin=None, relativize=True, **kw): |
| if self.salt == '': |
| salt = '-' |
| else: |
| salt = self.salt.encode('hex-codec') |
| return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations, salt) |
| |
| def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): |
| algorithm = tok.get_uint8() |
| flags = tok.get_uint8() |
| iterations = tok.get_uint16() |
| salt = tok.get_string() |
| if salt == '-': |
| salt = '' |
| else: |
| salt = salt.decode('hex-codec') |
| return cls(rdclass, rdtype, algorithm, flags, iterations, salt) |
| |
| from_text = classmethod(from_text) |
| |
| def to_wire(self, file, compress = None, origin = None): |
| l = len(self.salt) |
| file.write(struct.pack("!BBHB", self.algorithm, self.flags, |
| self.iterations, l)) |
| file.write(self.salt) |
| |
| def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): |
| (algorithm, flags, iterations, slen) = struct.unpack('!BBHB', |
| wire[current : current + 5]) |
| current += 5 |
| rdlen -= 5 |
| salt = wire[current : current + slen] |
| current += slen |
| rdlen -= slen |
| if rdlen != 0: |
| raise dns.exception.FormError |
| return cls(rdclass, rdtype, algorithm, flags, iterations, salt) |
| |
| from_wire = classmethod(from_wire) |
| |
| def _cmp(self, other): |
| b1 = cStringIO.StringIO() |
| self.to_wire(b1) |
| b2 = cStringIO.StringIO() |
| other.to_wire(b2) |
| return cmp(b1.getvalue(), b2.getvalue()) |