1 # Copyright (C) 2006, 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.
16 """TXT-like base class."""
22 class TXTBase(dns.rdata.Rdata):
23 """Base class for rdata that is like a TXT record
25 @ivar strings: the text strings
26 @type strings: list of string
29 __slots__ = ['strings']
31 def __init__(self, rdclass, rdtype, strings):
32 super(TXTBase, self).__init__(rdclass, rdtype)
33 if isinstance(strings, str):
35 self.strings = strings[:]
37 def to_text(self, origin=None, relativize=True, **kw):
40 for s in self.strings:
41 txt += '%s"%s"' % (prefix, dns.rdata._escapify(s))
45 def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
48 token = tok.get().unescape()
49 if token.is_eol_or_eof():
51 if not (token.is_quoted_string() or token.is_identifier()):
52 raise dns.exception.SyntaxError("expected a string")
53 if len(token.value) > 255:
54 raise dns.exception.SyntaxError("string too long")
55 strings.append(token.value)
57 raise dns.exception.UnexpectedEnd
58 return cls(rdclass, rdtype, strings)
60 from_text = classmethod(from_text)
62 def to_wire(self, file, compress = None, origin = None):
63 for s in self.strings:
70 def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
73 l = ord(wire[current])
77 raise dns.exception.FormError
78 s = wire[current : current + l]
82 return cls(rdclass, rdtype, strings)
84 from_wire = classmethod(from_wire)
86 def _cmp(self, other):
87 return cmp(self.strings, other.strings)