1cef7893435aa41160dd1255c43cb8498279738ccChris Craik# Copyright (C) 2004-2007, 2009, 2010 Nominum, Inc. 2cef7893435aa41160dd1255c43cb8498279738ccChris Craik# 3cef7893435aa41160dd1255c43cb8498279738ccChris Craik# Permission to use, copy, modify, and distribute this software and its 4cef7893435aa41160dd1255c43cb8498279738ccChris Craik# documentation for any purpose with or without fee is hereby granted, 5cef7893435aa41160dd1255c43cb8498279738ccChris Craik# provided that the above copyright notice and this permission notice 6cef7893435aa41160dd1255c43cb8498279738ccChris Craik# appear in all copies. 7cef7893435aa41160dd1255c43cb8498279738ccChris Craik# 8cef7893435aa41160dd1255c43cb8498279738ccChris Craik# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 9cef7893435aa41160dd1255c43cb8498279738ccChris Craik# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10cef7893435aa41160dd1255c43cb8498279738ccChris Craik# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR 11cef7893435aa41160dd1255c43cb8498279738ccChris Craik# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12cef7893435aa41160dd1255c43cb8498279738ccChris Craik# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13cef7893435aa41160dd1255c43cb8498279738ccChris Craik# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 14cef7893435aa41160dd1255c43cb8498279738ccChris Craik# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15cef7893435aa41160dd1255c43cb8498279738ccChris Craik 16cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport cStringIO 17cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport struct 18cef7893435aa41160dd1255c43cb8498279738ccChris Craik 19cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport dns.exception 20cef7893435aa41160dd1255c43cb8498279738ccChris Craikimport dns.rdata 21cef7893435aa41160dd1255c43cb8498279738ccChris Craik 22cef7893435aa41160dd1255c43cb8498279738ccChris Craikclass NSEC3PARAM(dns.rdata.Rdata): 23cef7893435aa41160dd1255c43cb8498279738ccChris Craik """NSEC3PARAM record 24cef7893435aa41160dd1255c43cb8498279738ccChris Craik 25cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar algorithm: the hash algorithm number 26cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type algorithm: int 27cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar flags: the flags 28cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type flags: int 29cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar iterations: the number of iterations 30cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type iterations: int 31cef7893435aa41160dd1255c43cb8498279738ccChris Craik @ivar salt: the salt 32cef7893435aa41160dd1255c43cb8498279738ccChris Craik @type salt: string""" 33cef7893435aa41160dd1255c43cb8498279738ccChris Craik 34cef7893435aa41160dd1255c43cb8498279738ccChris Craik __slots__ = ['algorithm', 'flags', 'iterations', 'salt'] 35cef7893435aa41160dd1255c43cb8498279738ccChris Craik 36cef7893435aa41160dd1255c43cb8498279738ccChris Craik def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt): 37cef7893435aa41160dd1255c43cb8498279738ccChris Craik super(NSEC3PARAM, self).__init__(rdclass, rdtype) 38cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.algorithm = algorithm 39cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.flags = flags 40cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.iterations = iterations 41cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.salt = salt 42cef7893435aa41160dd1255c43cb8498279738ccChris Craik 43cef7893435aa41160dd1255c43cb8498279738ccChris Craik def to_text(self, origin=None, relativize=True, **kw): 44cef7893435aa41160dd1255c43cb8498279738ccChris Craik if self.salt == '': 45cef7893435aa41160dd1255c43cb8498279738ccChris Craik salt = '-' 46cef7893435aa41160dd1255c43cb8498279738ccChris Craik else: 47cef7893435aa41160dd1255c43cb8498279738ccChris Craik salt = self.salt.encode('hex-codec') 48cef7893435aa41160dd1255c43cb8498279738ccChris Craik return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations, salt) 49cef7893435aa41160dd1255c43cb8498279738ccChris Craik 50cef7893435aa41160dd1255c43cb8498279738ccChris Craik def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): 51cef7893435aa41160dd1255c43cb8498279738ccChris Craik algorithm = tok.get_uint8() 52cef7893435aa41160dd1255c43cb8498279738ccChris Craik flags = tok.get_uint8() 53cef7893435aa41160dd1255c43cb8498279738ccChris Craik iterations = tok.get_uint16() 54cef7893435aa41160dd1255c43cb8498279738ccChris Craik salt = tok.get_string() 55cef7893435aa41160dd1255c43cb8498279738ccChris Craik if salt == '-': 56cef7893435aa41160dd1255c43cb8498279738ccChris Craik salt = '' 57cef7893435aa41160dd1255c43cb8498279738ccChris Craik else: 58cef7893435aa41160dd1255c43cb8498279738ccChris Craik salt = salt.decode('hex-codec') 59cef7893435aa41160dd1255c43cb8498279738ccChris Craik return cls(rdclass, rdtype, algorithm, flags, iterations, salt) 60cef7893435aa41160dd1255c43cb8498279738ccChris Craik 61cef7893435aa41160dd1255c43cb8498279738ccChris Craik from_text = classmethod(from_text) 62cef7893435aa41160dd1255c43cb8498279738ccChris Craik 63cef7893435aa41160dd1255c43cb8498279738ccChris Craik def to_wire(self, file, compress = None, origin = None): 64cef7893435aa41160dd1255c43cb8498279738ccChris Craik l = len(self.salt) 65cef7893435aa41160dd1255c43cb8498279738ccChris Craik file.write(struct.pack("!BBHB", self.algorithm, self.flags, 66cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.iterations, l)) 67cef7893435aa41160dd1255c43cb8498279738ccChris Craik file.write(self.salt) 68cef7893435aa41160dd1255c43cb8498279738ccChris Craik 69cef7893435aa41160dd1255c43cb8498279738ccChris Craik def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): 70cef7893435aa41160dd1255c43cb8498279738ccChris Craik (algorithm, flags, iterations, slen) = struct.unpack('!BBHB', 71cef7893435aa41160dd1255c43cb8498279738ccChris Craik wire[current : current + 5]) 72cef7893435aa41160dd1255c43cb8498279738ccChris Craik current += 5 73cef7893435aa41160dd1255c43cb8498279738ccChris Craik rdlen -= 5 74cef7893435aa41160dd1255c43cb8498279738ccChris Craik salt = wire[current : current + slen] 75cef7893435aa41160dd1255c43cb8498279738ccChris Craik current += slen 76cef7893435aa41160dd1255c43cb8498279738ccChris Craik rdlen -= slen 77cef7893435aa41160dd1255c43cb8498279738ccChris Craik if rdlen != 0: 78cef7893435aa41160dd1255c43cb8498279738ccChris Craik raise dns.exception.FormError 79cef7893435aa41160dd1255c43cb8498279738ccChris Craik return cls(rdclass, rdtype, algorithm, flags, iterations, salt) 80cef7893435aa41160dd1255c43cb8498279738ccChris Craik 81cef7893435aa41160dd1255c43cb8498279738ccChris Craik from_wire = classmethod(from_wire) 82cef7893435aa41160dd1255c43cb8498279738ccChris Craik 83cef7893435aa41160dd1255c43cb8498279738ccChris Craik def _cmp(self, other): 84cef7893435aa41160dd1255c43cb8498279738ccChris Craik b1 = cStringIO.StringIO() 85cef7893435aa41160dd1255c43cb8498279738ccChris Craik self.to_wire(b1) 86cef7893435aa41160dd1255c43cb8498279738ccChris Craik b2 = cStringIO.StringIO() 87cef7893435aa41160dd1255c43cb8498279738ccChris Craik other.to_wire(b2) 88cef7893435aa41160dd1255c43cb8498279738ccChris Craik return cmp(b1.getvalue(), b2.getvalue()) 89