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# Copyright (C) 2003-2007, 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 cStringIO
import struct
import dns.exception
import dns.dnssec
import dns.rdata
import 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)
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
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))
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)
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)
def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
prefix = wire[current : current + 5].unwrap()
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].unwrap()
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)
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