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

     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.
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     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
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    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 SSHFP(dns.rdata.Rdata):
    22      """SSHFP record
    23
    24      @ivar algorithm: the algorithm
    25      @type algorithm: int
    26      @ivar fp_type: the digest type
    27      @type fp_type: int
    28      @ivar fingerprint: the fingerprint
    29      @type fingerprint: string
    30      @see: draft-ietf-secsh-dns-05.txt"""
    31
    32      __slots__ = ['algorithm', 'fp_type', 'fingerprint']
    33
    34 -    def __init__(self, rdclass, rdtype, algorithm, fp_type,
    35                   fingerprint):
    36          super(SSHFP, self).__init__(rdclass, rdtype)
    37          self.algorithm = algorithm
    38          self.fp_type = fp_type
    39          self.fingerprint = fingerprint
    40
    41 -    def to_text(self, origin=None, relativize=True, **kw):
    42          return '%d %d %s' % (self.algorithm,
    43                               self.fp_type,
    44                               dns.rdata._hexify(self.fingerprint,
    45                                                 chunksize=128))
    46
    47 -    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
    48          algorithm = tok.get_uint8()
    49          fp_type = tok.get_uint8()
    50          chunks = []
    51          while 1:
    52              t = tok.get().unescape()
    53              if t.is_eol_or_eof():
    54                  break
    55              if not t.is_identifier():
    56                  raise dns.exception.SyntaxError
    57              chunks.append(t.value)
    58          fingerprint = ''.join(chunks)
    59          fingerprint = fingerprint.decode('hex_codec')
    60          return cls(rdclass, rdtype, algorithm, fp_type, fingerprint)
    61
    62      from_text = classmethod(from_text)
    63
    64 -    def to_wire(self, file, compress = None, origin = None):
    65          header = struct.pack("!BB", self.algorithm, self.fp_type)
    66          file.write(header)
    67          file.write(self.fingerprint)
    68
    69 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
    70          header = struct.unpack("!BB", wire[current : current + 2])
    71          current += 2
    72          rdlen -= 2
    73          fingerprint = wire[current : current + rdlen].unwrap()
    74          return cls(rdclass, rdtype, header[0], header[1], fingerprint)
    75
    76      from_wire = classmethod(from_wire)
    77
    78 -    def _cmp(self, other):
    79          hs = struct.pack("!BB", self.algorithm, self.fp_type)
    80          ho = struct.pack("!BB", other.algorithm, other.fp_type)
    81          v = cmp(hs, ho)
    82          if v == 0:
    83              v = cmp(self.fingerprint, other.fingerprint)
    84          return v
    85