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# Copyright (C) 2003-2007, 2009-2011 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.
import struct
import dns.exception
import dns.rdata
import dns.name
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
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)
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)
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)
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)
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
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