Source code for pytomo.dns.rdtypes.IN.PX

# 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.

from __future__ import absolute_import

import struct

from ... import exception as dns_exception
from ... import rdata as dns_rdata
from ... import name as dns_name

[docs]class PX(dns_rdata.Rdata): """PX record. @ivar preference: the preference value @type preference: int @ivar map822: the map822 name @type map822: dns_name.Name object @ivar mapx400: the mapx400 name @type mapx400: dns_name.Name object @see: RFC 2163""" __slots__ = ['preference', 'map822', 'mapx400'] def __init__(self, rdclass, rdtype, preference, map822, mapx400): super(PX, self).__init__(rdclass, rdtype) self.preference = preference self.map822 = map822 self.mapx400 = mapx400
[docs] def to_text(self, origin=None, relativize=True, **kw): map822 = self.map822.choose_relativity(origin, relativize) mapx400 = self.mapx400.choose_relativity(origin, relativize) return '%d %s %s' % (self.preference, map822, mapx400)
[docs] def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): preference = tok.get_uint16() map822 = tok.get_name() map822 = map822.choose_relativity(origin, relativize) mapx400 = tok.get_name(None) mapx400 = mapx400.choose_relativity(origin, relativize) tok.get_eol() return cls(rdclass, rdtype, preference, map822, mapx400)
from_text = classmethod(from_text)
[docs] def to_wire(self, file, compress = None, origin = None): pref = struct.pack("!H", self.preference) file.write(pref) self.map822.to_wire(file, None, origin) self.mapx400.to_wire(file, None, origin)
[docs] def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): (preference, ) = struct.unpack('!H', wire[current : current + 2]) current += 2 rdlen -= 2 (map822, cused) = dns_name.from_wire(wire[: current + rdlen], current) if cused > rdlen: raise dns_exception.FormError current += cused rdlen -= cused if not origin is None: map822 = map822.relativize(origin) (mapx400, cused) = dns_name.from_wire(wire[: current + rdlen], current) if cused != rdlen: raise dns_exception.FormError if not origin is None: mapx400 = mapx400.relativize(origin) return cls(rdclass, rdtype, preference, map822, mapx400)
from_wire = classmethod(from_wire)
[docs] def choose_relativity(self, origin = None, relativize = True): self.map822 = self.map822.choose_relativity(origin, relativize) self.mapx400 = self.mapx400.choose_relativity(origin, relativize)
def _cmp(self, other): sp = struct.pack("!H", self.preference) op = struct.pack("!H", other.preference) v = cmp(sp, op) if v == 0: v = cmp(self.map822, other.map822) if v == 0: v = cmp(self.mapx400, other.mapx400) return v