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1 # Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license 2 3 # Copyright (C) 2004-2007, 2009-2011 Nominum, Inc. 4 # 5 # Permission to use, copy, modify, and distribute this software and its 6 # documentation for any purpose with or without fee is hereby granted, 7 # provided that the above copyright notice and this permission notice 8 # appear in all copies. 9 # 10 # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 11 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR 13 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 16 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 18 import struct 19 import binascii 20 21 import dns.exception 22 import dns.rdata 23 from dns._compat import text_type27 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'] 409142 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 = salt5052 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 @classmethod61 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)7173 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 @classmethod80 (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)
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