| # Copyright (C) 2006, 2007, 2009, 2010 Nominum, Inc. |
| # |
| # Permission to use, copy, modify, and distribute this software and its |
| # documentation for any purpose with or without fee is hereby granted, |
| # provided that the above copyright notice and this permission notice |
| # appear in all copies. |
| # |
| # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES |
| # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR |
| # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| """TXT-like base class.""" |
| |
| import dns.exception |
| import dns.rdata |
| import dns.tokenizer |
| |
| class TXTBase(dns.rdata.Rdata): |
| """Base class for rdata that is like a TXT record |
| |
| @ivar strings: the text strings |
| @type strings: list of string |
| @see: RFC 1035""" |
| |
| __slots__ = ['strings'] |
| |
| def __init__(self, rdclass, rdtype, strings): |
| super(TXTBase, self).__init__(rdclass, rdtype) |
| if isinstance(strings, str): |
| strings = [ strings ] |
| self.strings = strings[:] |
| |
| def to_text(self, origin=None, relativize=True, **kw): |
| txt = '' |
| prefix = '' |
| for s in self.strings: |
| txt += '%s"%s"' % (prefix, dns.rdata._escapify(s)) |
| prefix = ' ' |
| return txt |
| |
| def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): |
| strings = [] |
| while 1: |
| token = tok.get().unescape() |
| if token.is_eol_or_eof(): |
| break |
| if not (token.is_quoted_string() or token.is_identifier()): |
| raise dns.exception.SyntaxError("expected a string") |
| if len(token.value) > 255: |
| raise dns.exception.SyntaxError("string too long") |
| strings.append(token.value) |
| if len(strings) == 0: |
| raise dns.exception.UnexpectedEnd |
| return cls(rdclass, rdtype, strings) |
| |
| from_text = classmethod(from_text) |
| |
| def to_wire(self, file, compress = None, origin = None): |
| for s in self.strings: |
| l = len(s) |
| assert l < 256 |
| byte = chr(l) |
| file.write(byte) |
| file.write(s) |
| |
| def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): |
| strings = [] |
| while rdlen > 0: |
| l = ord(wire[current]) |
| current += 1 |
| rdlen -= 1 |
| if l > rdlen: |
| raise dns.exception.FormError |
| s = wire[current : current + l] |
| current += l |
| rdlen -= l |
| strings.append(s) |
| return cls(rdclass, rdtype, strings) |
| |
| from_wire = classmethod(from_wire) |
| |
| def _cmp(self, other): |
| return cmp(self.strings, other.strings) |