| # 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 SRV(dns.rdata.Rdata): |
| """SRV record |
| |
| @ivar priority: the priority |
| @type priority: int |
| @ivar weight: the weight |
| @type weight: int |
| @ivar port: the port of the service |
| @type port: int |
| @ivar target: the target host |
| @type target: dns.name.Name object |
| @see: RFC 2782""" |
| |
| __slots__ = ['priority', 'weight', 'port', 'target'] |
| |
| def __init__(self, rdclass, rdtype, priority, weight, port, target): |
| super(SRV, self).__init__(rdclass, rdtype) |
| self.priority = priority |
| self.weight = weight |
| self.port = port |
| self.target = target |
| |
| def to_text(self, origin=None, relativize=True, **kw): |
| target = self.target.choose_relativity(origin, relativize) |
| return '%d %d %d %s' % (self.priority, self.weight, self.port, |
| target) |
| |
| def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): |
| priority = tok.get_uint16() |
| weight = tok.get_uint16() |
| port = tok.get_uint16() |
| target = tok.get_name(None) |
| target = target.choose_relativity(origin, relativize) |
| tok.get_eol() |
| return cls(rdclass, rdtype, priority, weight, port, target) |
| |
| from_text = classmethod(from_text) |
| |
| def to_wire(self, file, compress = None, origin = None): |
| three_ints = struct.pack("!HHH", self.priority, self.weight, self.port) |
| file.write(three_ints) |
| self.target.to_wire(file, compress, origin) |
| |
| def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): |
| (priority, weight, port) = struct.unpack('!HHH', |
| wire[current : current + 6]) |
| current += 6 |
| rdlen -= 6 |
| (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, priority, weight, port, 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): |
| sp = struct.pack("!HHH", self.priority, self.weight, self.port) |
| op = struct.pack("!HHH", other.priority, other.weight, other.port) |
| v = cmp(sp, op) |
| if v == 0: |
| v = cmp(self.target, other.target) |
| return v |