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

 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 SRV(dns.rdata.Rdata):
23 """SRV record 24 25 @ivar priority: the priority 26 @type priority: int 27 @ivar weight: the weight 28 @type weight: int 29 @ivar port: the port of the service 30 @type port: int 31 @ivar target: the target host 32 @type target: dns.name.Name object 33 @see: RFC 2782""" 34 35 __slots__ = ['priority', 'weight', 'port', 'target'] 36
37 - def __init__(self, rdclass, rdtype, priority, weight, port, target):
38 super(SRV, self).__init__(rdclass, rdtype) 39 self.priority = priority 40 self.weight = weight 41 self.port = port 42 self.target = target
43
44 - def to_text(self, origin=None, relativize=True, **kw):
45 target = self.target.choose_relativity(origin, relativize) 46 return '%d %d %d %s' % (self.priority, self.weight, self.port, 47 target)
48
49 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
50 priority = tok.get_uint16() 51 weight = tok.get_uint16() 52 port = tok.get_uint16() 53 target = tok.get_name(None) 54 target = target.choose_relativity(origin, relativize) 55 tok.get_eol() 56 return cls(rdclass, rdtype, priority, weight, port, target)
57 58 from_text = classmethod(from_text) 59
60 - def to_wire(self, file, compress = None, origin = None):
61 three_ints = struct.pack("!HHH", self.priority, self.weight, self.port) 62 file.write(three_ints) 63 self.target.to_wire(file, compress, origin)
64
65 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
66 (priority, weight, port) = struct.unpack('!HHH', 67 wire[current : current + 6]) 68 current += 6 69 rdlen -= 6 70 (target, cused) = dns.name.from_wire(wire[: current + rdlen], 71 current) 72 if cused != rdlen: 73 raise dns.exception.FormError 74 if not origin is None: 75 target = target.relativize(origin) 76 return cls(rdclass, rdtype, priority, weight, port, target)
77 78 from_wire = classmethod(from_wire) 79
80 - def choose_relativity(self, origin = None, relativize = True):
82
83 - def _cmp(self, other):
84 sp = struct.pack("!HHH", self.priority, self.weight, self.port) 85 op = struct.pack("!HHH", other.priority, other.weight, other.port) 86 v = cmp(sp, op) 87 if v == 0: 88 v = cmp(self.target, other.target) 89 return v
90