Package dns :: Package rdtypes :: Package IN :: Module PX
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Source Code for Module dns.rdtypes.IN.PX

 1  # Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. 
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15   
16  import struct 
17   
18  import dns.exception 
19  import dns.rdata 
20  import dns.name 
21   
22 -class PX(dns.rdata.Rdata):
23 """PX record. 24 25 @ivar preference: the preference value 26 @type preference: int 27 @ivar map822: the map822 name 28 @type map822: dns.name.Name object 29 @ivar mapx400: the mapx400 name 30 @type mapx400: dns.name.Name object 31 @see: RFC 2163""" 32 33 __slots__ = ['preference', 'map822', 'mapx400'] 34
35 - def __init__(self, rdclass, rdtype, preference, map822, mapx400):
36 super(PX, self).__init__(rdclass, rdtype) 37 self.preference = preference 38 self.map822 = map822 39 self.mapx400 = mapx400
40
41 - def to_text(self, origin=None, relativize=True, **kw):
45
46 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
54 55 from_text = classmethod(from_text) 56
57 - def to_wire(self, file, compress = None, origin = None):
58 pref = struct.pack("!H", self.preference) 59 file.write(pref) 60 self.map822.to_wire(file, None, origin) 61 self.mapx400.to_wire(file, None, origin)
62
63 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
64 (preference, ) = struct.unpack('!H', wire[current : current + 2]) 65 current += 2 66 rdlen -= 2 67 (map822, cused) = dns.name.from_wire(wire[: current + rdlen], 68 current) 69 if cused > rdlen: 70 raise dns.exception.FormError 71 current += cused 72 rdlen -= cused 73 if not origin is None: 74 map822 = map822.relativize(origin) 75 (mapx400, cused) = dns.name.from_wire(wire[: current + rdlen], 76 current) 77 if cused != rdlen: 78 raise dns.exception.FormError 79 if not origin is None: 80 mapx400 = mapx400.relativize(origin) 81 return cls(rdclass, rdtype, preference, map822, mapx400)
82 83 from_wire = classmethod(from_wire) 84
85 - def choose_relativity(self, origin = None, relativize = True):
88
89 - def _cmp(self, other):
90 sp = struct.pack("!H", self.preference) 91 op = struct.pack("!H", other.preference) 92 v = cmp(sp, op) 93 if v == 0: 94 v = cmp(self.map822, other.map822) 95 if v == 0: 96 v = cmp(self.mapx400, other.mapx400) 97 return v
98