Package dns :: Package rdtypes :: Package IN :: Module PX |
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# Source Code for Module dns.rdtypes.IN.PX

     1  # Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
     2  #
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     4  # documentation for any purpose with or without fee is hereby granted,
     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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    14  # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    15
    16  import struct
    17
    18  import dns.exception
    19  import dns.rdata
    20  import dns.name
    21
    22 -class PX(dns.rdata.Rdata):
    23      """PX record.
    24
    25      @ivar preference: the preference value
    26      @type preference: int
    27      @ivar map822: the map822 name
    28      @type map822: dns.name.Name object
    29      @ivar mapx400: the mapx400 name
    30      @type mapx400: dns.name.Name object
    31      @see: RFC 2163"""
    32
    33      __slots__ = ['preference', 'map822', 'mapx400']
    34
    35 -    def __init__(self, rdclass, rdtype, preference, map822, mapx400):
    36          super(PX, self).__init__(rdclass, rdtype)
    37          self.preference = preference
    38          self.map822 = map822
    39          self.mapx400 = mapx400
    40
    41 -    def to_text(self, origin=None, relativize=True, **kw):
    42          map822 = self.map822.choose_relativity(origin, relativize)
    43          mapx400 = self.mapx400.choose_relativity(origin, relativize)
    44          return '%d %s %s' % (self.preference, map822, mapx400)
    45
    46 -    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
    47          preference = tok.get_uint16()
    48          map822 = tok.get_name()
    49          map822 = map822.choose_relativity(origin, relativize)
    50          mapx400 = tok.get_name(None)
    51          mapx400 = mapx400.choose_relativity(origin, relativize)
    52          tok.get_eol()
    53          return cls(rdclass, rdtype, preference, map822, mapx400)
    54
    55      from_text = classmethod(from_text)
    56
    57 -    def to_wire(self, file, compress = None, origin = None):
    58          pref = struct.pack("!H", self.preference)
    59          file.write(pref)
    60          self.map822.to_wire(file, None, origin)
    61          self.mapx400.to_wire(file, None, origin)
    62
    63 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
    64          (preference, ) = struct.unpack('!H', wire[current : current + 2])
    65          current += 2
    66          rdlen -= 2
    67          (map822, cused) = dns.name.from_wire(wire[: current + rdlen],
    68                                                 current)
    69          if cused > rdlen:
    70              raise dns.exception.FormError
    71          current += cused
    72          rdlen -= cused
    73          if not origin is None:
    74              map822 = map822.relativize(origin)
    75          (mapx400, cused) = dns.name.from_wire(wire[: current + rdlen],
    76                                                current)
    77          if cused != rdlen:
    78              raise dns.exception.FormError
    79          if not origin is None:
    80              mapx400 = mapx400.relativize(origin)
    81          return cls(rdclass, rdtype, preference, map822, mapx400)
    82
    83      from_wire = classmethod(from_wire)
    84
    85 -    def choose_relativity(self, origin = None, relativize = True):
    86          self.map822 = self.map822.choose_relativity(origin, relativize)
    87          self.mapx400 = self.mapx400.choose_relativity(origin, relativize)
    88
    89 -    def _cmp(self, other):
    90          sp = struct.pack("!H", self.preference)
    91          op = struct.pack("!H", other.preference)
    92          v = cmp(sp, op)
    93          if v == 0:
    94              v = cmp(self.map822, other.map822)
    95              if v == 0:
    96                  v = cmp(self.mapx400, other.mapx400)
    97          return v
    98