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      1 # Copyright (C) 2006, 2007, 2009, 2010 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 dns.exception
     17 
     18 class DHCID(dns.rdata.Rdata):
     19     """DHCID record
     20 
     21     @ivar data: the data (the content of the RR is opaque as far as the
     22     DNS is concerned)
     23     @type data: string
     24     @see: RFC 4701"""
     25 
     26     __slots__ = ['data']
     27 
     28     def __init__(self, rdclass, rdtype, data):
     29         super(DHCID, self).__init__(rdclass, rdtype)
     30         self.data = data
     31 
     32     def to_text(self, origin=None, relativize=True, **kw):
     33         return dns.rdata._base64ify(self.data)
     34 
     35     def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
     36         chunks = []
     37         while 1:
     38             t = tok.get().unescape()
     39             if t.is_eol_or_eof():
     40                 break
     41             if not t.is_identifier():
     42                 raise dns.exception.SyntaxError
     43             chunks.append(t.value)
     44         b64 = ''.join(chunks)
     45         data = b64.decode('base64_codec')
     46         return cls(rdclass, rdtype, data)
     47 
     48     from_text = classmethod(from_text)
     49 
     50     def to_wire(self, file, compress = None, origin = None):
     51         file.write(self.data)
     52 
     53     def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
     54         data = wire[current : current + rdlen]
     55         return cls(rdclass, rdtype, data)
     56 
     57     from_wire = classmethod(from_wire)
     58 
     59     def _cmp(self, other):
     60         return cmp(self.data, other.data)
     61