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Direktori : /proc/self/root/lib64/python2.7/site-packages/dns/rdtypes/ANY/ |
Current File : //proc/self/root/lib64/python2.7/site-packages/dns/rdtypes/ANY/DNSKEY.py |
# Copyright (C) 2004-2007, 2009-2011 Nominum, Inc. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. import struct import dns.exception import dns.dnssec import dns.rdata # flag constants SEP = 0x0001 REVOKE = 0x0080 ZONE = 0x0100 _flag_by_text = { 'SEP': SEP, 'REVOKE': REVOKE, 'ZONE': ZONE } # We construct the inverse mapping programmatically to ensure that we # cannot make any mistakes (e.g. omissions, cut-and-paste errors) that # would cause the mapping not to be true inverse. _flag_by_value = dict([(y, x) for x, y in _flag_by_text.iteritems()]) def flags_to_text_set(flags): """Convert a DNSKEY flags value to set texts @rtype: set([string])""" flags_set = set() mask = 0x1 while mask <= 0x8000: if flags & mask: text = _flag_by_value.get(mask) if not text: text = hex(mask) flags_set.add(text) mask <<= 1 return flags_set def flags_from_text_set(texts_set): """Convert set of DNSKEY flag mnemonic texts to DNSKEY flag value @rtype: int""" flags = 0 for text in texts_set: try: flags += _flag_by_text[text] except KeyError: raise NotImplementedError( "DNSKEY flag '%s' is not supported" % text) return flags class DNSKEY(dns.rdata.Rdata): """DNSKEY record @ivar flags: the key flags @type flags: int @ivar protocol: the protocol for which this key may be used @type protocol: int @ivar algorithm: the algorithm used for the key @type algorithm: int @ivar key: the public key @type key: string""" __slots__ = ['flags', 'protocol', 'algorithm', 'key'] def __init__(self, rdclass, rdtype, flags, protocol, algorithm, key): super(DNSKEY, self).__init__(rdclass, rdtype) self.flags = flags self.protocol = protocol self.algorithm = algorithm self.key = key def to_text(self, origin=None, relativize=True, **kw): return '%d %d %d %s' % (self.flags, self.protocol, self.algorithm, dns.rdata._base64ify(self.key)) def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): flags = tok.get_uint16() protocol = tok.get_uint8() algorithm = dns.dnssec.algorithm_from_text(tok.get_string()) chunks = [] while 1: t = tok.get().unescape() if t.is_eol_or_eof(): break if not t.is_identifier(): raise dns.exception.SyntaxError chunks.append(t.value) b64 = ''.join(chunks) key = b64.decode('base64_codec') return cls(rdclass, rdtype, flags, protocol, algorithm, key) from_text = classmethod(from_text) def to_wire(self, file, compress = None, origin = None): header = struct.pack("!HBB", self.flags, self.protocol, self.algorithm) file.write(header) file.write(self.key) def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): if rdlen < 4: raise dns.exception.FormError header = struct.unpack('!HBB', wire[current : current + 4]) current += 4 rdlen -= 4 key = wire[current : current + rdlen].unwrap() return cls(rdclass, rdtype, header[0], header[1], header[2], key) from_wire = classmethod(from_wire) def _cmp(self, other): hs = struct.pack("!HBB", self.flags, self.protocol, self.algorithm) ho = struct.pack("!HBB", other.flags, other.protocol, other.algorithm) v = cmp(hs, ho) if v == 0: v = cmp(self.key, other.key) return v def flags_to_text_set(self): """Convert a DNSKEY flags value to set texts @rtype: set([string])""" return flags_to_text_set(self.flags)