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

     1  # Copyright (C) 2003-2007, 2009-2011 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
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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 SRV(dns.rdata.Rdata):
    24
    25      """SRV record
    26
    27      @ivar priority: the priority
    28      @type priority: int
    29      @ivar weight: the weight
    30      @type weight: int
    31      @ivar port: the port of the service
    32      @type port: int
    33      @ivar target: the target host
    34      @type target: dns.name.Name object
    35      @see: RFC 2782"""
    36
    37      __slots__ = ['priority', 'weight', 'port', 'target']
    38
    39 -    def __init__(self, rdclass, rdtype, priority, weight, port, target):
    40          super(SRV, self).__init__(rdclass, rdtype)
    41          self.priority = priority
    42          self.weight = weight
    43          self.port = port
    44          self.target = target
    45
    46 -    def to_text(self, origin=None, relativize=True, **kw):
    47          target = self.target.choose_relativity(origin, relativize)
    48          return '%d %d %d %s' % (self.priority, self.weight, self.port,
    49                                  target)
    50
    51      @classmethod
    52 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
    53          priority = tok.get_uint16()
    54          weight = tok.get_uint16()
    55          port = tok.get_uint16()
    56          target = tok.get_name(None)
    57          target = target.choose_relativity(origin, relativize)
    58          tok.get_eol()
    59          return cls(rdclass, rdtype, priority, weight, port, target)
    60
    61 -    def to_wire(self, file, compress=None, origin=None):
    62          three_ints = struct.pack("!HHH", self.priority, self.weight, self.port)
    63          file.write(three_ints)
    64          self.target.to_wire(file, compress, origin)
    65
    66      @classmethod
    67 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
    68          (priority, weight, port) = struct.unpack('!HHH',
    69                                                   wire[current: current + 6])
    70          current += 6
    71          rdlen -= 6
    72          (target, cused) = dns.name.from_wire(wire[: current + rdlen],
    73                                               current)
    74          if cused != rdlen:
    75              raise dns.exception.FormError
    76          if origin is not None:
    77              target = target.relativize(origin)
    78          return cls(rdclass, rdtype, priority, weight, port, target)
    79
    80 -    def choose_relativity(self, origin=None, relativize=True):
    81          self.target = self.target.choose_relativity(origin, relativize)
    82