1 # Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc.
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.
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.
21 class NXT(dns.rdata.Rdata):
24 @ivar next: the next name
25 @type next: dns.name.Name object
26 @ivar bitmap: the type bitmap
30 __slots__ = ['next', 'bitmap']
32 def __init__(self, rdclass, rdtype, next, bitmap):
33 super(NXT, self).__init__(rdclass, rdtype)
37 def to_text(self, origin=None, relativize=True, **kw):
38 next = self.next.choose_relativity(origin, relativize)
40 for i in xrange(0, len(self.bitmap)):
41 byte = ord(self.bitmap[i])
42 for j in xrange(0, 8):
43 if byte & (0x80 >> j):
44 bits.append(dns.rdatatype.to_text(i * 8 + j))
46 return '%s %s' % (next, text)
48 def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
50 next = next.choose_relativity(origin, relativize)
51 bitmap = ['\x00', '\x00', '\x00', '\x00',
52 '\x00', '\x00', '\x00', '\x00',
53 '\x00', '\x00', '\x00', '\x00',
54 '\x00', '\x00', '\x00', '\x00' ]
56 token = tok.get().unescape()
57 if token.is_eol_or_eof():
59 if token.value.isdigit():
60 nrdtype = int(token.value)
62 nrdtype = dns.rdatatype.from_text(token.value)
64 raise dns.exception.SyntaxError("NXT with bit 0")
66 raise dns.exception.SyntaxError("NXT with bit > 127")
68 bitmap[i] = chr(ord(bitmap[i]) | (0x80 >> (nrdtype % 8)))
69 bitmap = dns.rdata._truncate_bitmap(bitmap)
70 return cls(rdclass, rdtype, next, bitmap)
72 from_text = classmethod(from_text)
74 def to_wire(self, file, compress = None, origin = None):
75 self.next.to_wire(file, None, origin)
76 file.write(self.bitmap)
78 def to_digestable(self, origin = None):
79 return self.next.to_digestable(origin) + self.bitmap
81 def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
82 (next, cused) = dns.name.from_wire(wire[: current + rdlen], current)
85 bitmap = wire[current : current + rdlen]
86 if not origin is None:
87 next = next.relativize(origin)
88 return cls(rdclass, rdtype, next, bitmap)
90 from_wire = classmethod(from_wire)
92 def choose_relativity(self, origin = None, relativize = True):
93 self.next = self.next.choose_relativity(origin, relativize)
95 def _cmp(self, other):
96 v = cmp(self.next, other.next)
98 v = cmp(self.bitmap, other.bitmap)