Source Code for Module dns.rdtypes.ANY.TLSA

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15   
16  import struct 
17  import binascii 
18   
19  import dns.rdata 
20  import dns.rdatatype 
21   
22   
23 -class TLSA(dns.rdata.Rdata): 
24   
25      """TLSA record 
26   
27      @ivar usage: The certificate usage 
28      @type usage: int 
29      @ivar selector: The selector field 
30      @type selector: int 
31      @ivar mtype: The 'matching type' field 
32      @type mtype: int 
33      @ivar cert: The 'Certificate Association Data' field 
34      @type cert: string 
35      @see: RFC 6698""" 
36   
37      __slots__ = ['usage', 'selector', 'mtype', 'cert'] 
38   
39 -    def __init__(self, rdclass, rdtype, usage, selector, 
40                   mtype, cert): 
41          super(TLSA, self).__init__(rdclass, rdtype) 
42          self.usage = usage 
43          self.selector = selector 
44          self.mtype = mtype 
45          self.cert = cert 
46   
47 -    def to_text(self, origin=None, relativize=True, **kw): 
48          return '%d %d %d %s' % (self.usage, 
49                                  self.selector, 
50                                  self.mtype, 
51                                  dns.rdata._hexify(self.cert, 
52                                                    chunksize=128)) 
53   
54      @classmethod 
55 -    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): 
56          usage = tok.get_uint8() 
57          selector = tok.get_uint8() 
58          mtype = tok.get_uint8() 
59          cert_chunks = [] 
60          while 1: 
61              t = tok.get().unescape() 
62              if t.is_eol_or_eof(): 
63                  break 
64              if not t.is_identifier(): 
65                  raise dns.exception.SyntaxError 
66              cert_chunks.append(t.value.encode()) 
67          cert = b''.join(cert_chunks) 
68          cert = binascii.unhexlify(cert) 
69          return cls(rdclass, rdtype, usage, selector, mtype, cert) 
70   
71 -    def to_wire(self, file, compress=None, origin=None): 
72          header = struct.pack("!BBB", self.usage, self.selector, self.mtype) 
73          file.write(header) 
74          file.write(self.cert) 
75   
76      @classmethod 
77 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): 
78          header = struct.unpack("!BBB", wire[current: current + 3]) 
79          current += 3 
80          rdlen -= 3 
81          cert = wire[current: current + rdlen].unwrap() 
82          return cls(rdclass, rdtype, header[0], header[1], header[2], cert) 
83