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

 1  # Copyright (C) 2005-2007, 2009-2011 Nominum, Inc. 
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15   
16  import struct 
17   
18  import dns.rdata 
19  import dns.rdatatype 
20   
21 -class TLSA(dns.rdata.Rdata):
22 """TLSA record 23 24 @ivar usage: The certificate usage 25 @type usage: int 26 @ivar selector: The selector field 27 @type selector: int 28 @ivar mtype: The 'matching type' field 29 @type mtype: int 30 @ivar cert: The 'Certificate Association Data' field 31 @type cert: string 32 @see: RFC 6698""" 33 34 __slots__ = ['usage', 'selector', 'mtype', 'cert'] 35
36 - def __init__(self, rdclass, rdtype, usage, selector, 37 mtype, cert):
38 super(TLSA, self).__init__(rdclass, rdtype) 39 self.usage = usage 40 self.selector = selector 41 self.mtype = mtype 42 self.cert = cert
43
44 - def to_text(self, origin=None, relativize=True, **kw):
45 return '%d %d %d %s' % (self.usage, 46 self.selector, 47 self.mtype, 48 dns.rdata._hexify(self.cert, 49 chunksize=128))
50
51 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
52 usage = tok.get_uint8() 53 selector = tok.get_uint8() 54 mtype = tok.get_uint8() 55 cert_chunks = [] 56 while 1: 57 t = tok.get().unescape() 58 if t.is_eol_or_eof(): 59 break 60 if not t.is_identifier(): 61 raise dns.exception.SyntaxError 62 cert_chunks.append(t.value) 63 cert = ''.join(cert_chunks) 64 cert = cert.decode('hex_codec') 65 return cls(rdclass, rdtype, usage, selector, mtype, cert)
66 67 from_text = classmethod(from_text) 68
69 - def to_wire(self, file, compress = None, origin = None):
70 header = struct.pack("!BBB", self.usage, self.selector, self.mtype) 71 file.write(header) 72 file.write(self.cert)
73
74 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
75 header = struct.unpack("!BBB", wire[current : current + 3]) 76 current += 3 77 rdlen -= 3 78 cert = wire[current : current + rdlen].unwrap() 79 return cls(rdclass, rdtype, header[0], header[1], header[2], cert)
80 81 from_wire = classmethod(from_wire) 82
83 - def _cmp(self, other):
84 hs = struct.pack("!BBB", self.usage, self.selector, self.mtype) 85 ho = struct.pack("!BBB", other.usage, other.selector, other.mtype) 86 v = cmp(hs, ho) 87 if v == 0: 88 v = cmp(self.cert, other.cert) 89 return v
90