| # 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. |
| |
| 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 |
