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Edit File : dnskeybase.py \| Size : 4.28 KB
# 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 base64 import struct import dns.exception import dns.dnssec import dns.rdata # wildcard import __all__ = ["SEP", "REVOKE", "ZONE", "flags_to_text_set", "flags_from_text_set"] # 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.items()) 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 DNSKEYBase(dns.rdata.Rdata): """Base class for rdata that is like a 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(DNSKEYBase, 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)) @classmethod 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.encode()) b64 = b''.join(chunks) key = base64.b64decode(b64) return cls(rdclass, rdtype, flags, protocol, algorithm, key) 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) @classmethod 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) def flags_to_text_set(self): """Convert a DNSKEY flags value to set texts @rtype: set([string])""" return flags_to_text_set(self.flags) Back

Edit File : dnskeybase.py | Size : 4.28 KB

# 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 base64
import struct

import dns.exception
import dns.dnssec
import dns.rdata

# wildcard import
__all__ = ["SEP", "REVOKE", "ZONE",
           "flags_to_text_set", "flags_from_text_set"]

# 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.items())

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 DNSKEYBase(dns.rdata.Rdata):

"""Base class for rdata that is like a 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(DNSKEYBase, 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))

@classmethod
    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.encode())
        b64 = b''.join(chunks)
        key = base64.b64decode(b64)
        return cls(rdclass, rdtype, flags, protocol, algorithm, key)

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)

@classmethod
    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)

def flags_to_text_set(self):
        """Convert a DNSKEY flags value to set texts
        @rtype: set([string])"""
        return flags_to_text_set(self.flags)

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