| # Copyright (C) 2003-2007, 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. |
| |
| """NS-like base classes.""" |
| |
| import cStringIO |
| |
| import dns.exception |
| import dns.rdata |
| import dns.name |
| |
| class NSBase(dns.rdata.Rdata): |
| """Base class for rdata that is like an NS record. |
| |
| @ivar target: the target name of the rdata |
| @type target: dns.name.Name object""" |
| |
| __slots__ = ['target'] |
| |
| def __init__(self, rdclass, rdtype, target): |
| super(NSBase, self).__init__(rdclass, rdtype) |
| self.target = target |
| |
| def to_text(self, origin=None, relativize=True, **kw): |
| target = self.target.choose_relativity(origin, relativize) |
| return str(target) |
| |
| def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): |
| target = tok.get_name() |
| target = target.choose_relativity(origin, relativize) |
| tok.get_eol() |
| return cls(rdclass, rdtype, target) |
| |
| from_text = classmethod(from_text) |
| |
| def to_wire(self, file, compress = None, origin = None): |
| self.target.to_wire(file, compress, origin) |
| |
| def to_digestable(self, origin = None): |
| return self.target.to_digestable(origin) |
| |
| def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): |
| (target, cused) = dns.name.from_wire(wire[: current + rdlen], |
| current) |
| if cused != rdlen: |
| raise dns.exception.FormError |
| if not origin is None: |
| target = target.relativize(origin) |
| return cls(rdclass, rdtype, target) |
| |
| from_wire = classmethod(from_wire) |
| |
| def choose_relativity(self, origin = None, relativize = True): |
| self.target = self.target.choose_relativity(origin, relativize) |
| |
| def _cmp(self, other): |
| return cmp(self.target, other.target) |
| |
| class UncompressedNS(NSBase): |
| """Base class for rdata that is like an NS record, but whose name |
| is not compressed when convert to DNS wire format, and whose |
| digestable form is not downcased.""" |
| |
| def to_wire(self, file, compress = None, origin = None): |
| super(UncompressedNS, self).to_wire(file, None, origin) |
| |
| def to_digestable(self, origin = None): |
| f = cStringIO.StringIO() |
| self.to_wire(f, None, origin) |
| return f.getvalue() |
