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

     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
     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
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    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 struct
    17
    18  import dns.exception
    19  import dns.rdata
    20  import dns.tokenizer
    21
    22
    23 -class CAA(dns.rdata.Rdata):
    24
    25      """CAA (Certification Authority Authorization) record
    26
    27      @ivar flags: the flags
    28      @type flags: int
    29      @ivar tag: the tag
    30      @type tag: string
    31      @ivar value: the value
    32      @type value: string
    33      @see: RFC 6844"""
    34
    35      __slots__ = ['flags', 'tag', 'value']
    36
    37 -    def __init__(self, rdclass, rdtype, flags, tag, value):
    38          super(CAA, self).__init__(rdclass, rdtype)
    39          self.flags = flags
    40          self.tag = tag
    41          self.value = value
    42
    43 -    def to_text(self, origin=None, relativize=True, **kw):
    44          return '%u %s "%s"' % (self.flags,
    45                                 dns.rdata._escapify(self.tag),
    46                                 dns.rdata._escapify(self.value))
    47
    48      @classmethod
    49 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
    50          flags = tok.get_uint8()
    51          tag = tok.get_string().encode()
    52          if len(tag) > 255:
    53              raise dns.exception.SyntaxError("tag too long")
    54          if not tag.isalnum():
    55              raise dns.exception.SyntaxError("tag is not alphanumeric")
    56          value = tok.get_string().encode()
    57          return cls(rdclass, rdtype, flags, tag, value)
    58
    59 -    def to_wire(self, file, compress=None, origin=None):
    60          file.write(struct.pack('!B', self.flags))
    61          l = len(self.tag)
    62          assert l < 256
    63          file.write(struct.pack('!B', l))
    64          file.write(self.tag)
    65          file.write(self.value)
    66
    67      @classmethod
    68 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
    69          (flags, l) = struct.unpack('!BB', wire[current: current + 2])
    70          current += 2
    71          tag = wire[current: current + l]
    72          value = wire[current + l:current + rdlen - 2]
    73          return cls(rdclass, rdtype, flags, tag, value)
    74