Source Code for Module dns.rdtypes.ANY.NSEC3PARAM

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