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

 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 SSHFP(dns.rdata.Rdata):
22 """SSHFP record 23 24 @ivar algorithm: the algorithm 25 @type algorithm: int 26 @ivar fp_type: the digest type 27 @type fp_type: int 28 @ivar fingerprint: the fingerprint 29 @type fingerprint: string 30 @see: draft-ietf-secsh-dns-05.txt""" 31 32 __slots__ = ['algorithm', 'fp_type', 'fingerprint'] 33
34 - def __init__(self, rdclass, rdtype, algorithm, fp_type, 35 fingerprint):
36 super(SSHFP, self).__init__(rdclass, rdtype) 37 self.algorithm = algorithm 38 self.fp_type = fp_type 39 self.fingerprint = fingerprint
40
41 - def to_text(self, origin=None, relativize=True, **kw):
42 return '%d %d %s' % (self.algorithm, 43 self.fp_type, 44 dns.rdata._hexify(self.fingerprint, 45 chunksize=128))
46
47 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
48 algorithm = tok.get_uint8() 49 fp_type = tok.get_uint8() 50 chunks = [] 51 while 1: 52 t = tok.get().unescape() 53 if t.is_eol_or_eof(): 54 break 55 if not t.is_identifier(): 56 raise dns.exception.SyntaxError 57 chunks.append(t.value) 58 fingerprint = ''.join(chunks) 59 fingerprint = fingerprint.decode('hex_codec') 60 return cls(rdclass, rdtype, algorithm, fp_type, fingerprint)
61 62 from_text = classmethod(from_text) 63
64 - def to_wire(self, file, compress = None, origin = None):
65 header = struct.pack("!BB", self.algorithm, self.fp_type) 66 file.write(header) 67 file.write(self.fingerprint)
68
69 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
70 header = struct.unpack("!BB", wire[current : current + 2]) 71 current += 2 72 rdlen -= 2 73 fingerprint = wire[current : current + rdlen].unwrap() 74 return cls(rdclass, rdtype, header[0], header[1], fingerprint)
75 76 from_wire = classmethod(from_wire) 77
78 - def _cmp(self, other):
79 hs = struct.pack("!BB", self.algorithm, self.fp_type) 80 ho = struct.pack("!BB", other.algorithm, other.fp_type) 81 v = cmp(hs, ho) 82 if v == 0: 83 v = cmp(self.fingerprint, other.fingerprint) 84 return v
85