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      1 # Copyright (C) 2003-2007, 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 import dns.rdata
     18 import dns.tokenizer
     19 
     20 class ISDN(dns.rdata.Rdata):
     21     """ISDN record
     22 
     23     @ivar address: the ISDN address
     24     @type address: string
     25     @ivar subaddress: the ISDN subaddress (or '' if not present)
     26     @type subaddress: string
     27     @see: RFC 1183"""
     28 
     29     __slots__ = ['address', 'subaddress']
     30 
     31     def __init__(self, rdclass, rdtype, address, subaddress):
     32         super(ISDN, self).__init__(rdclass, rdtype)
     33         self.address = address
     34         self.subaddress = subaddress
     35 
     36     def to_text(self, origin=None, relativize=True, **kw):
     37         if self.subaddress:
     38             return '"%s" "%s"' % (dns.rdata._escapify(self.address),
     39                                   dns.rdata._escapify(self.subaddress))
     40         else:
     41             return '"%s"' % dns.rdata._escapify(self.address)
     42 
     43     def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
     44         address = tok.get_string()
     45         t = tok.get()
     46         if not t.is_eol_or_eof():
     47             tok.unget(t)
     48             subaddress = tok.get_string()
     49         else:
     50             tok.unget(t)
     51             subaddress = ''
     52         tok.get_eol()
     53         return cls(rdclass, rdtype, address, subaddress)
     54 
     55     from_text = classmethod(from_text)
     56 
     57     def to_wire(self, file, compress = None, origin = None):
     58         l = len(self.address)
     59         assert l < 256
     60         byte = chr(l)
     61         file.write(byte)
     62         file.write(self.address)
     63         l = len(self.subaddress)
     64         if l > 0:
     65             assert l < 256
     66             byte = chr(l)
     67             file.write(byte)
     68             file.write(self.subaddress)
     69 
     70     def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
     71         l = ord(wire[current])
     72         current += 1
     73         rdlen -= 1
     74         if l > rdlen:
     75             raise dns.exception.FormError
     76         address = wire[current : current + l]
     77         current += l
     78         rdlen -= l
     79         if rdlen > 0:
     80             l = ord(wire[current])
     81             current += 1
     82             rdlen -= 1
     83             if l != rdlen:
     84                 raise dns.exception.FormError
     85             subaddress = wire[current : current + l]
     86         else:
     87             subaddress = ''
     88         return cls(rdclass, rdtype, address, subaddress)
     89 
     90     from_wire = classmethod(from_wire)
     91 
     92     def _cmp(self, other):
     93         v = cmp(self.address, other.address)
     94         if v == 0:
     95             v = cmp(self.subaddress, other.subaddress)
     96         return v
     97