Source Code for Module dns.rdtypes.IN.PX

 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 PX(dns.rdata.Rdata): 
26   
27      """PX record. 
28   
29      @ivar preference: the preference value 
30      @type preference: int 
31      @ivar map822: the map822 name 
32      @type map822: dns.name.Name object 
33      @ivar mapx400: the mapx400 name 
34      @type mapx400: dns.name.Name object 
35      @see: RFC 2163""" 
36   
37      __slots__ = ['preference', 'map822', 'mapx400'] 
38   
39 -    def __init__(self, rdclass, rdtype, preference, map822, mapx400): 
40          super(PX, self).__init__(rdclass, rdtype) 
41          self.preference = preference 
42          self.map822 = map822 
43          self.mapx400 = mapx400 
44   
45 -    def to_text(self, origin=None, relativize=True, **kw): 
46          map822 = self.map822.choose_relativity(origin, relativize) 
47          mapx400 = self.mapx400.choose_relativity(origin, relativize) 
48          return '%d %s %s' % (self.preference, map822, mapx400) 
49   
50      @classmethod 
51 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): 
52          preference = tok.get_uint16() 
53          map822 = tok.get_name() 
54          map822 = map822.choose_relativity(origin, relativize) 
55          mapx400 = tok.get_name(None) 
56          mapx400 = mapx400.choose_relativity(origin, relativize) 
57          tok.get_eol() 
58          return cls(rdclass, rdtype, preference, map822, mapx400) 
59   
60 -    def to_wire(self, file, compress=None, origin=None): 
61          pref = struct.pack("!H", self.preference) 
62          file.write(pref) 
63          self.map822.to_wire(file, None, origin) 
64          self.mapx400.to_wire(file, None, origin) 
65   
66      @classmethod 
67 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): 
68          (preference, ) = struct.unpack('!H', wire[current: current + 2]) 
69          current += 2 
70          rdlen -= 2 
71          (map822, cused) = dns.name.from_wire(wire[: current + rdlen], 
72                                               current) 
73          if cused > rdlen: 
74              raise dns.exception.FormError 
75          current += cused 
76          rdlen -= cused 
77          if origin is not None: 
78              map822 = map822.relativize(origin) 
79          (mapx400, cused) = dns.name.from_wire(wire[: current + rdlen], 
80                                                current) 
81          if cused != rdlen: 
82              raise dns.exception.FormError 
83          if origin is not None: 
84              mapx400 = mapx400.relativize(origin) 
85          return cls(rdclass, rdtype, preference, map822, mapx400) 
86   
87 -    def choose_relativity(self, origin=None, relativize=True): 
88          self.map822 = self.map822.choose_relativity(origin, relativize) 
89          self.mapx400 = self.mapx400.choose_relativity(origin, relativize) 
90