Package dns :: Package rdtypes :: Package ANY :: Module NSEC3PARAM
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Source Code for Module dns.rdtypes.ANY.NSEC3PARAM

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15   
16  import cStringIO 
17  import struct 
18   
19  import dns.exception 
20  import dns.rdata 
21   
22 -class NSEC3PARAM(dns.rdata.Rdata):
23 """NSEC3PARAM record 24 25 @ivar algorithm: the hash algorithm number 26 @type algorithm: int 27 @ivar flags: the flags 28 @type flags: int 29 @ivar iterations: the number of iterations 30 @type iterations: int 31 @ivar salt: the salt 32 @type salt: string""" 33 34 __slots__ = ['algorithm', 'flags', 'iterations', 'salt'] 35
36 - def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt):
37 super(NSEC3PARAM, self).__init__(rdclass, rdtype) 38 self.algorithm = algorithm 39 self.flags = flags 40 self.iterations = iterations 41 self.salt = salt
42
43 - def to_text(self, origin=None, relativize=True, **kw):
44 if self.salt == '': 45 salt = '-' 46 else: 47 salt = self.salt.encode('hex-codec') 48 return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations, salt)
49
50 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
51 algorithm = tok.get_uint8() 52 flags = tok.get_uint8() 53 iterations = tok.get_uint16() 54 salt = tok.get_string() 55 if salt == '-': 56 salt = '' 57 else: 58 salt = salt.decode('hex-codec') 59 return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
60 61 from_text = classmethod(from_text) 62
63 - def to_wire(self, file, compress = None, origin = None):
64 l = len(self.salt) 65 file.write(struct.pack("!BBHB", self.algorithm, self.flags, 66 self.iterations, l)) 67 file.write(self.salt)
68
69 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
70 (algorithm, flags, iterations, slen) = struct.unpack('!BBHB', 71 wire[current : current + 5]) 72 current += 5 73 rdlen -= 5 74 salt = wire[current : current + slen].unwrap() 75 current += slen 76 rdlen -= slen 77 if rdlen != 0: 78 raise dns.exception.FormError 79 return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
80 81 from_wire = classmethod(from_wire) 82
83 - def _cmp(self, other):
84 b1 = cStringIO.StringIO() 85 self.to_wire(b1) 86 b2 = cStringIO.StringIO() 87 other.to_wire(b2) 88 return cmp(b1.getvalue(), b2.getvalue())
89