Source Code for Module dns.rdtypes.IN.SRV

 1  # Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license 
 2   
 3  # Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. 
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17   
18  import struct 
19   
20  import dns.exception 
21  import dns.rdata 
22  import dns.name 
23   
24   
25 -class SRV(dns.rdata.Rdata): 
26   
27      """SRV record 
28   
29      @ivar priority: the priority 
30      @type priority: int 
31      @ivar weight: the weight 
32      @type weight: int 
33      @ivar port: the port of the service 
34      @type port: int 
35      @ivar target: the target host 
36      @type target: dns.name.Name object 
37      @see: RFC 2782""" 
38   
39      __slots__ = ['priority', 'weight', 'port', 'target'] 
40   
41 -    def __init__(self, rdclass, rdtype, priority, weight, port, target): 
42          super(SRV, self).__init__(rdclass, rdtype) 
43          self.priority = priority 
44          self.weight = weight 
45          self.port = port 
46          self.target = target 
47   
48 -    def to_text(self, origin=None, relativize=True, **kw): 
49          target = self.target.choose_relativity(origin, relativize) 
50          return '%d %d %d %s' % (self.priority, self.weight, self.port, 
51                                  target) 
52   
53      @classmethod 
54 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): 
55          priority = tok.get_uint16() 
56          weight = tok.get_uint16() 
57          port = tok.get_uint16() 
58          target = tok.get_name(None) 
59          target = target.choose_relativity(origin, relativize) 
60          tok.get_eol() 
61          return cls(rdclass, rdtype, priority, weight, port, target) 
62   
63 -    def to_wire(self, file, compress=None, origin=None): 
64          three_ints = struct.pack("!HHH", self.priority, self.weight, self.port) 
65          file.write(three_ints) 
66          self.target.to_wire(file, compress, origin) 
67   
68      @classmethod 
69 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): 
70          (priority, weight, port) = struct.unpack('!HHH', 
71                                                   wire[current: current + 6]) 
72          current += 6 
73          rdlen -= 6 
74          (target, cused) = dns.name.from_wire(wire[: current + rdlen], 
75                                               current) 
76          if cused != rdlen: 
77              raise dns.exception.FormError 
78          if origin is not None: 
79              target = target.relativize(origin) 
80          return cls(rdclass, rdtype, priority, weight, port, target) 
81   
82 -    def choose_relativity(self, origin=None, relativize=True): 
83          self.target = self.target.choose_relativity(origin, relativize) 
84