1cef7893435aa41160dd1255c43cb8498279738ccChris Craik# Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc. 2cef7893435aa41160dd1255c43cb8498279738ccChris Craik# 3cef7893435aa41160dd1255c43cb8498279738ccChris Craik# Permission to use, copy, modify, and distribute this software and its 4cef7893435aa41160dd1255c43cb8498279738ccChris Craik# documentation for any purpose with or without fee is hereby granted, 5cef7893435aa41160dd1255c43cb8498279738ccChris Craik# provided that the above copyright notice and this permission notice 6cef7893435aa41160dd1255c43cb8498279738ccChris Craik# appear in all copies. 7cef7893435aa41160dd1255c43cb8498279738ccChris Craik# 8cef7893435aa41160dd1255c43cb8498279738ccChris Craik# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 9cef7893435aa41160dd1255c43cb8498279738ccChris Craik# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10cef7893435aa41160dd1255c43cb8498279738ccChris Craik# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR 11cef7893435aa41160dd1255c43cb8498279738ccChris Craik# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12cef7893435aa41160dd1255c43cb8498279738ccChris Craik# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13cef7893435aa41160dd1255c43cb8498279738ccChris Craik# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 14cef7893435aa41160dd1255c43cb8498279738ccChris Craik# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15cef7893435aa41160dd1255c43cb8498279738ccChris Craik 16cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport struct 17cef7893435aa41160dd1255c43cb8498279738ccChris Craik 18cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport dns.exception 19cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport dns.rdata 20cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport dns.name 21cef7893435aa41160dd1255c43cb8498279738ccChris Craik 22cef7893435aa41160dd1255c43cb8498279738ccChris Craikclass SRV(dns.rdata.Rdata): 23cef7893435aa41160dd1255c43cb8498279738ccChris Craik """SRV record 24cef7893435aa41160dd1255c43cb8498279738ccChris Craik 25cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar priority: the priority 26cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type priority: int 27cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar weight: the weight 28cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type weight: int 29cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar port: the port of the service 30cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type port: int 31cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar target: the target host 32cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type target: dns.name.Name object 33cef7893435aa41160dd1255c43cb8498279738ccChris Craik @see: RFC 2782""" 34cef7893435aa41160dd1255c43cb8498279738ccChris Craik 35cef7893435aa41160dd1255c43cb8498279738ccChris Craik __slots__ = ['priority', 'weight', 'port', 'target'] 36cef7893435aa41160dd1255c43cb8498279738ccChris Craik 37cef7893435aa41160dd1255c43cb8498279738ccChris Craik def __init__(self, rdclass, rdtype, priority, weight, port, target): 38cef7893435aa41160dd1255c43cb8498279738ccChris Craik super(SRV, self).__init__(rdclass, rdtype) 39cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.priority = priority 40cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.weight = weight 41cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.port = port 42cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.target = target 43cef7893435aa41160dd1255c43cb8498279738ccChris Craik 44cef7893435aa41160dd1255c43cb8498279738ccChris Craik def to_text(self, origin=None, relativize=True, **kw): 45cef7893435aa41160dd1255c43cb8498279738ccChris Craik target = self.target.choose_relativity(origin, relativize) 46cef7893435aa41160dd1255c43cb8498279738ccChris Craik return '%d %d %d %s' % (self.priority, self.weight, self.port, 47cef7893435aa41160dd1255c43cb8498279738ccChris Craik target) 48cef7893435aa41160dd1255c43cb8498279738ccChris Craik 49cef7893435aa41160dd1255c43cb8498279738ccChris Craik def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): 50cef7893435aa41160dd1255c43cb8498279738ccChris Craik priority = tok.get_uint16() 51cef7893435aa41160dd1255c43cb8498279738ccChris Craik weight = tok.get_uint16() 52cef7893435aa41160dd1255c43cb8498279738ccChris Craik port = tok.get_uint16() 53cef7893435aa41160dd1255c43cb8498279738ccChris Craik target = tok.get_name(None) 54cef7893435aa41160dd1255c43cb8498279738ccChris Craik target = target.choose_relativity(origin, relativize) 55cef7893435aa41160dd1255c43cb8498279738ccChris Craik tok.get_eol() 56cef7893435aa41160dd1255c43cb8498279738ccChris Craik return cls(rdclass, rdtype, priority, weight, port, target) 57cef7893435aa41160dd1255c43cb8498279738ccChris Craik 58cef7893435aa41160dd1255c43cb8498279738ccChris Craik from_text = classmethod(from_text) 59cef7893435aa41160dd1255c43cb8498279738ccChris Craik 60cef7893435aa41160dd1255c43cb8498279738ccChris Craik def to_wire(self, file, compress = None, origin = None): 61cef7893435aa41160dd1255c43cb8498279738ccChris Craik three_ints = struct.pack("!HHH", self.priority, self.weight, self.port) 62cef7893435aa41160dd1255c43cb8498279738ccChris Craik file.write(three_ints) 63cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.target.to_wire(file, compress, origin) 64cef7893435aa41160dd1255c43cb8498279738ccChris Craik 65cef7893435aa41160dd1255c43cb8498279738ccChris Craik def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): 66cef7893435aa41160dd1255c43cb8498279738ccChris Craik (priority, weight, port) = struct.unpack('!HHH', 67cef7893435aa41160dd1255c43cb8498279738ccChris Craik wire[current : current + 6]) 68cef7893435aa41160dd1255c43cb8498279738ccChris Craik current += 6 69cef7893435aa41160dd1255c43cb8498279738ccChris Craik rdlen -= 6 70cef7893435aa41160dd1255c43cb8498279738ccChris Craik (target, cused) = dns.name.from_wire(wire[: current + rdlen], 71cef7893435aa41160dd1255c43cb8498279738ccChris Craik current) 72cef7893435aa41160dd1255c43cb8498279738ccChris Craik if cused != rdlen: 73cef7893435aa41160dd1255c43cb8498279738ccChris Craik raise dns.exception.FormError 74cef7893435aa41160dd1255c43cb8498279738ccChris Craik if not origin is None: 75cef7893435aa41160dd1255c43cb8498279738ccChris Craik target = target.relativize(origin) 76cef7893435aa41160dd1255c43cb8498279738ccChris Craik return cls(rdclass, rdtype, priority, weight, port, target) 77cef7893435aa41160dd1255c43cb8498279738ccChris Craik 78cef7893435aa41160dd1255c43cb8498279738ccChris Craik from_wire = classmethod(from_wire) 79cef7893435aa41160dd1255c43cb8498279738ccChris Craik 80cef7893435aa41160dd1255c43cb8498279738ccChris Craik def choose_relativity(self, origin = None, relativize = True): 81cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.target = self.target.choose_relativity(origin, relativize) 82cef7893435aa41160dd1255c43cb8498279738ccChris Craik 83cef7893435aa41160dd1255c43cb8498279738ccChris Craik def _cmp(self, other): 84cef7893435aa41160dd1255c43cb8498279738ccChris Craik sp = struct.pack("!HHH", self.priority, self.weight, self.port) 85cef7893435aa41160dd1255c43cb8498279738ccChris Craik op = struct.pack("!HHH", other.priority, other.weight, other.port) 86cef7893435aa41160dd1255c43cb8498279738ccChris Craik v = cmp(sp, op) 87cef7893435aa41160dd1255c43cb8498279738ccChris Craik if v == 0: 88cef7893435aa41160dd1255c43cb8498279738ccChris Craik v = cmp(self.target, other.target) 89cef7893435aa41160dd1255c43cb8498279738ccChris Craik return v 90