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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     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
    23 -class PX(dns.rdata.Rdata):
    24
    25      """PX record.
    26
    27      @ivar preference: the preference value
    28      @type preference: int
    29      @ivar map822: the map822 name
    30      @type map822: dns.name.Name object
    31      @ivar mapx400: the mapx400 name
    32      @type mapx400: dns.name.Name object
    33      @see: RFC 2163"""
    34
    35      __slots__ = ['preference', 'map822', 'mapx400']
    36
    37 -    def __init__(self, rdclass, rdtype, preference, map822, mapx400):
    38          super(PX, self).__init__(rdclass, rdtype)
    39          self.preference = preference
    40          self.map822 = map822
    41          self.mapx400 = mapx400
    42
    43 -    def to_text(self, origin=None, relativize=True, **kw):
    44          map822 = self.map822.choose_relativity(origin, relativize)
    45          mapx400 = self.mapx400.choose_relativity(origin, relativize)
    46          return '%d %s %s' % (self.preference, map822, mapx400)
    47
    48      @classmethod
    49 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
    50          preference = tok.get_uint16()
    51          map822 = tok.get_name()
    52          map822 = map822.choose_relativity(origin, relativize)
    53          mapx400 = tok.get_name(None)
    54          mapx400 = mapx400.choose_relativity(origin, relativize)
    55          tok.get_eol()
    56          return cls(rdclass, rdtype, preference, map822, mapx400)
    57
    58 -    def to_wire(self, file, compress=None, origin=None):
    59          pref = struct.pack("!H", self.preference)
    60          file.write(pref)
    61          self.map822.to_wire(file, None, origin)
    62          self.mapx400.to_wire(file, None, origin)
    63
    64      @classmethod
    65 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
    66          (preference, ) = struct.unpack('!H', wire[current: current + 2])
    67          current += 2
    68          rdlen -= 2
    69          (map822, cused) = dns.name.from_wire(wire[: current + rdlen],
    70                                               current)
    71          if cused > rdlen:
    72              raise dns.exception.FormError
    73          current += cused
    74          rdlen -= cused
    75          if origin is not None:
    76              map822 = map822.relativize(origin)
    77          (mapx400, cused) = dns.name.from_wire(wire[: current + rdlen],
    78                                                current)
    79          if cused != rdlen:
    80              raise dns.exception.FormError
    81          if origin is not None:
    82              mapx400 = mapx400.relativize(origin)
    83          return cls(rdclass, rdtype, preference, map822, mapx400)
    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