Source code for pytomo.dns.rdtypes.ANY.CERT

# Copyright (C) 2003-2007, 2009, 2010 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.

from __future__ import absolute_import

import cStringIO
import struct

from ... import exception as dns_exception
from ... import dnssec as dns_dnssec
from ... import rdata as dns_rdata
#from ... import tokenizer as dns_tokenizer

_ctype_by_value = {
    1 : 'PKIX',
    2 : 'SPKI',
    3 : 'PGP',
    253 : 'URI',
    254 : 'OID',
    }

_ctype_by_name = {
    'PKIX' : 1,
    'SPKI' : 2,
    'PGP' : 3,
    'URI' : 253,
    'OID' : 254,
    }

def _ctype_from_text(what):
    v = _ctype_by_name.get(what)
    if not v is None:
        return v
    return int(what)

def _ctype_to_text(what):
    v = _ctype_by_value.get(what)
    if not v is None:
        return v
    return str(what)

[docs]class CERT(dns_rdata.Rdata): """CERT record @ivar certificate_type: certificate type @type certificate_type: int @ivar key_tag: key tag @type key_tag: int @ivar algorithm: algorithm @type algorithm: int @ivar certificate: the certificate or CRL @type certificate: string @see: RFC 2538""" __slots__ = ['certificate_type', 'key_tag', 'algorithm', 'certificate'] def __init__(self, rdclass, rdtype, certificate_type, key_tag, algorithm, certificate): super(CERT, self).__init__(rdclass, rdtype) self.certificate_type = certificate_type self.key_tag = key_tag self.algorithm = algorithm self.certificate = certificate
[docs] def to_text(self, origin=None, relativize=True, **kw): certificate_type = _ctype_to_text(self.certificate_type) return "%s %d %s %s" % (certificate_type, self.key_tag, dns_dnssec.algorithm_to_text(self.algorithm), dns_rdata._base64ify(self.certificate))
[docs] def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): certificate_type = _ctype_from_text(tok.get_string()) key_tag = tok.get_uint16() algorithm = dns_dnssec.algorithm_from_text(tok.get_string()) if algorithm < 0 or algorithm > 255: raise dns_exception.SyntaxError("bad algorithm type") 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) certificate = b64.decode('base64_codec') return cls(rdclass, rdtype, certificate_type, key_tag, algorithm, certificate)
from_text = classmethod(from_text)
[docs] def to_wire(self, file, compress = None, origin = None): prefix = struct.pack("!HHB", self.certificate_type, self.key_tag, self.algorithm) file.write(prefix) file.write(self.certificate)
[docs] def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): prefix = wire[current : current + 5] current += 5 rdlen -= 5 if rdlen < 0: raise dns_exception.FormError (certificate_type, key_tag, algorithm) = struct.unpack("!HHB", prefix) certificate = wire[current : current + rdlen] return cls(rdclass, rdtype, certificate_type, key_tag, algorithm, certificate)
from_wire = classmethod(from_wire) def _cmp(self, other): f = cStringIO.StringIO() self.to_wire(f) wire1 = f.getvalue() f.seek(0) f.truncate() other.to_wire(f) wire2 = f.getvalue() f.close() return cmp(wire1, wire2)