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

     1  # Copyright (C) 2005-2007, 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
    10  # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
    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.rdata
    19  import dns.rdatatype
    20
    21 -class TLSA(dns.rdata.Rdata):
    22      """TLSA record
    23
    24      @ivar usage: The certificate usage
    25      @type usage: int
    26      @ivar selector: The selector field
    27      @type selector: int
    28      @ivar mtype: The 'matching type' field
    29      @type mtype: int
    30      @ivar cert: The 'Certificate Association Data' field
    31      @type cert: string
    32      @see: RFC 6698"""
    33
    34      __slots__ = ['usage', 'selector', 'mtype', 'cert']
    35
    36 -    def __init__(self, rdclass, rdtype, usage, selector,
    37                   mtype, cert):
    38          super(TLSA, self).__init__(rdclass, rdtype)
    39          self.usage = usage
    40          self.selector = selector
    41          self.mtype = mtype
    42          self.cert = cert
    43
    44 -    def to_text(self, origin=None, relativize=True, **kw):
    45          return '%d %d %d %s' % (self.usage,
    46                                  self.selector,
    47                                  self.mtype,
    48                                  dns.rdata._hexify(self.cert,
    49                                                 chunksize=128))
    50
    51 -    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
    52          usage = tok.get_uint8()
    53          selector = tok.get_uint8()
    54          mtype = tok.get_uint8()
    55          cert_chunks = []
    56          while 1:
    57              t = tok.get().unescape()
    58              if t.is_eol_or_eof():
    59                  break
    60              if not t.is_identifier():
    61                  raise dns.exception.SyntaxError
    62              cert_chunks.append(t.value)
    63          cert = ''.join(cert_chunks)
    64          cert = cert.decode('hex_codec')
    65          return cls(rdclass, rdtype, usage, selector, mtype, cert)
    66
    67      from_text = classmethod(from_text)
    68
    69 -    def to_wire(self, file, compress = None, origin = None):
    70          header = struct.pack("!BBB", self.usage, self.selector, self.mtype)
    71          file.write(header)
    72          file.write(self.cert)
    73
    74 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
    75          header = struct.unpack("!BBB", wire[current : current + 3])
    76          current += 3
    77          rdlen -= 3
    78          cert = wire[current : current + rdlen].unwrap()
    79          return cls(rdclass, rdtype, header[0], header[1], header[2], cert)
    80
    81      from_wire = classmethod(from_wire)
    82
    83 -    def _cmp(self, other):
    84          hs = struct.pack("!BBB", self.usage, self.selector, self.mtype)
    85          ho = struct.pack("!BBB", other.usage, other.selector, other.mtype)
    86          v = cmp(hs, ho)
    87          if v == 0:
    88              v = cmp(self.cert, other.cert)
    89          return v
    90