Package dns :: Package rdtypes :: Package ANY :: Module NSEC3PARAM |
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# Source Code for Module dns.rdtypes.ANY.NSEC3PARAM

     1  # Copyright (C) 2004-2007, 2009, 2010 Nominum, Inc.
     2  #
     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.
     7  #
     8  # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
     9  # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    10  # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
    11  # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    12  # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    13  # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
    14  # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    15
    16  import cStringIO
    17  import struct
    18
    19  import dns.exception
    20  import dns.rdata
    21
    22 -class NSEC3PARAM(dns.rdata.Rdata):
    23      """NSEC3PARAM record
    24
    25      @ivar algorithm: the hash algorithm number
    26      @type algorithm: int
    27      @ivar flags: the flags
    28      @type flags: int
    29      @ivar iterations: the number of iterations
    30      @type iterations: int
    31      @ivar salt: the salt
    32      @type salt: string"""
    33
    34      __slots__ = ['algorithm', 'flags', 'iterations', 'salt']
    35
    36 -    def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt):
    37          super(NSEC3PARAM, self).__init__(rdclass, rdtype)
    38          self.algorithm = algorithm
    39          self.flags = flags
    40          self.iterations = iterations
    41          self.salt = salt
    42
    43 -    def to_text(self, origin=None, relativize=True, **kw):
    44          if self.salt == '':
    45              salt = '-'
    46          else:
    47              salt = self.salt.encode('hex-codec')
    48          return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations, salt)
    49
    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()
    55          if salt == '-':
    56              salt = ''
    57          else:
    58              salt = salt.decode('hex-codec')
    59          return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
    60
    61      from_text = classmethod(from_text)
    62
    63 -    def to_wire(self, file, compress = None, origin = None):
    64          l = len(self.salt)
    65          file.write(struct.pack("!BBHB", self.algorithm, self.flags,
    66                                 self.iterations, l))
    67          file.write(self.salt)
    68
    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])
    72          current += 5
    73          rdlen -= 5
    74          salt = wire[current : current + slen]
    75          current += slen
    76          rdlen -= slen
    77          if rdlen != 0:
    78              raise dns.exception.FormError
    79          return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
    80
    81      from_wire = classmethod(from_wire)
    82
    83 -    def _cmp(self, other):
    84          b1 = cStringIO.StringIO()
    85          self.to_wire(b1)
    86          b2 = cStringIO.StringIO()
    87          other.to_wire(b2)
    88          return cmp(b1.getvalue(), b2.getvalue())
    89