Package dns :: Package rdtypes :: Module nsbase |
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# Source Code for Module dns.rdtypes.nsbase

     1  # Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc.
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     5  # provided that the above copyright notice and this permission notice
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     9  # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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    15
    16  """NS-like base classes."""
    17
    18  import cStringIO
    19
    20  import dns.exception
    21  import dns.rdata
    22  import dns.name
    23
    24 -class NSBase(dns.rdata.Rdata):
    25      """Base class for rdata that is like an NS record.
    26
    27      @ivar target: the target name of the rdata
    28      @type target: dns.name.Name object"""
    29
    30      __slots__ = ['target']
    31
    32 -    def __init__(self, rdclass, rdtype, target):
    33          super(NSBase, self).__init__(rdclass, rdtype)
    34          self.target = target
    35
    36 -    def to_text(self, origin=None, relativize=True, **kw):
    37          target = self.target.choose_relativity(origin, relativize)
    38          return str(target)
    39
    40 -    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
    41          target = tok.get_name()
    42          target = target.choose_relativity(origin, relativize)
    43          tok.get_eol()
    44          return cls(rdclass, rdtype, target)
    45
    46      from_text = classmethod(from_text)
    47
    48 -    def to_wire(self, file, compress = None, origin = None):
    49          self.target.to_wire(file, compress, origin)
    50
    51 -    def to_digestable(self, origin = None):
    52          return self.target.to_digestable(origin)
    53
    54 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
    55          (target, cused) = dns.name.from_wire(wire[: current + rdlen],
    56                                               current)
    57          if cused != rdlen:
    58              raise dns.exception.FormError
    59          if not origin is None:
    60              target = target.relativize(origin)
    61          return cls(rdclass, rdtype, target)
    62
    63      from_wire = classmethod(from_wire)
    64
    65 -    def choose_relativity(self, origin = None, relativize = True):
    66          self.target = self.target.choose_relativity(origin, relativize)
    67
    68 -    def _cmp(self, other):
    69          return cmp(self.target, other.target)
    70
    71 -class UncompressedNS(NSBase):
    72      """Base class for rdata that is like an NS record, but whose name
    73      is not compressed when convert to DNS wire format, and whose
    74      digestable form is not downcased."""
    75
    76 -    def to_wire(self, file, compress = None, origin = None):
    77          super(UncompressedNS, self).to_wire(file, None, origin)
    78
    79 -    def to_digestable(self, origin = None):
    80          f = cStringIO.StringIO()
    81          self.to_wire(f, None, origin)
    82          return f.getvalue()
    83