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  import binascii
    18
    19  import dns.rdata
    20  import dns.rdatatype
    21
    22
    23 -class TLSA(dns.rdata.Rdata):
    24
    25      """TLSA record
    26
    27      @ivar usage: The certificate usage
    28      @type usage: int
    29      @ivar selector: The selector field
    30      @type selector: int
    31      @ivar mtype: The 'matching type' field
    32      @type mtype: int
    33      @ivar cert: The 'Certificate Association Data' field
    34      @type cert: string
    35      @see: RFC 6698"""
    36
    37      __slots__ = ['usage', 'selector', 'mtype', 'cert']
    38
    39 -    def __init__(self, rdclass, rdtype, usage, selector,
    40                   mtype, cert):
    41          super(TLSA, self).__init__(rdclass, rdtype)
    42          self.usage = usage
    43          self.selector = selector
    44          self.mtype = mtype
    45          self.cert = cert
    46
    47 -    def to_text(self, origin=None, relativize=True, **kw):
    48          return '%d %d %d %s' % (self.usage,
    49                                  self.selector,
    50                                  self.mtype,
    51                                  dns.rdata._hexify(self.cert,
    52                                                    chunksize=128))
    53
    54      @classmethod
    55 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
    56          usage = tok.get_uint8()
    57          selector = tok.get_uint8()
    58          mtype = tok.get_uint8()
    59          cert_chunks = []
    60          while 1:
    61              t = tok.get().unescape()
    62              if t.is_eol_or_eof():
    63                  break
    64              if not t.is_identifier():
    65                  raise dns.exception.SyntaxError
    66              cert_chunks.append(t.value.encode())
    67          cert = b''.join(cert_chunks)
    68          cert = binascii.unhexlify(cert)
    69          return cls(rdclass, rdtype, usage, selector, mtype, cert)
    70
    71 -    def to_wire(self, file, compress=None, origin=None):
    72          header = struct.pack("!BBB", self.usage, self.selector, self.mtype)
    73          file.write(header)
    74          file.write(self.cert)
    75
    76      @classmethod
    77 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
    78          header = struct.unpack("!BBB", wire[current: current + 3])
    79          current += 3
    80          rdlen -= 3
    81          cert = wire[current: current + rdlen].unwrap()
    82          return cls(rdclass, rdtype, header[0], header[1], header[2], cert)
    83