Source Code for Module dns.rdtypes.ANY.NSEC3PARAM

 1  # Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license 
 2   
 3  # Copyright (C) 2004-2007, 2009-2011 Nominum, Inc. 
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17   
18  import struct 
19  import binascii 
20   
21  import dns.exception 
22  import dns.rdata 
23  from dns._compat import text_type 
24   
25   
26 -class NSEC3PARAM(dns.rdata.Rdata): 
27   
28      """NSEC3PARAM record 
29   
30      @ivar algorithm: the hash algorithm number 
31      @type algorithm: int 
32      @ivar flags: the flags 
33      @type flags: int 
34      @ivar iterations: the number of iterations 
35      @type iterations: int 
36      @ivar salt: the salt 
37      @type salt: string""" 
38   
39      __slots__ = ['algorithm', 'flags', 'iterations', 'salt'] 
40   
41 -    def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt): 
42          super(NSEC3PARAM, self).__init__(rdclass, rdtype) 
43          self.algorithm = algorithm 
44          self.flags = flags 
45          self.iterations = iterations 
46          if isinstance(salt, text_type): 
47              self.salt = salt.encode() 
48          else: 
49              self.salt = salt 
50   
51 -    def to_text(self, origin=None, relativize=True, **kw): 
52          if self.salt == b'': 
53              salt = '-' 
54          else: 
55              salt = binascii.hexlify(self.salt).decode() 
56          return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations, 
57                                  salt) 
58   
59      @classmethod 
60 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): 
61          algorithm = tok.get_uint8() 
62          flags = tok.get_uint8() 
63          iterations = tok.get_uint16() 
64          salt = tok.get_string() 
65          if salt == '-': 
66              salt = '' 
67          else: 
68              salt = binascii.unhexlify(salt.encode()) 
69          tok.get_eol() 
70          return cls(rdclass, rdtype, algorithm, flags, iterations, salt) 
71   
72 -    def to_wire(self, file, compress=None, origin=None): 
73          l = len(self.salt) 
74          file.write(struct.pack("!BBHB", self.algorithm, self.flags, 
75                                 self.iterations, l)) 
76          file.write(self.salt) 
77   
78      @classmethod 
79 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): 
80          (algorithm, flags, iterations, slen) = \ 
81               struct.unpack('!BBHB', 
82                             wire[current: current + 5]) 
83          current += 5 
84          rdlen -= 5 
85          salt = wire[current: current + slen].unwrap() 
86          current += slen 
87          rdlen -= slen 
88          if rdlen != 0: 
89              raise dns.exception.FormError 
90          return cls(rdclass, rdtype, algorithm, flags, iterations, salt) 
91