# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2005-2007, 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 binascii
import struct
import dns.immutable
import dns.rdata
import dns.rdatatype
@dns.immutable.immutable
class TLSABase(dns.rdata.Rdata):
"""Base class for TLSA and SMIMEA records"""
# see: RFC 6698
__slots__ = ["usage", "selector", "mtype", "cert"]
def __init__(self, rdclass, rdtype, usage, selector, mtype, cert):
super().__init__(rdclass, rdtype)
self.usage = self._as_uint8(usage)
self.selector = self._as_uint8(selector)
self.mtype = self._as_uint8(mtype)
self.cert = self._as_bytes(cert)
def to_text(self, origin=None, relativize=True, **kw):
kw = kw.copy()
chunksize = kw.pop("chunksize", 128)
return "%d %d %d %s" % (
self.usage,
self.selector,
self.mtype,
dns.rdata._hexify(self.cert, chunksize=chunksize, **kw),
)
@classmethod
def from_text(
cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
):
usage = tok.get_uint8()
selector = tok.get_uint8()
mtype = tok.get_uint8()
cert = tok.concatenate_remaining_identifiers().encode()
cert = binascii.unhexlify(cert)
return cls(rdclass, rdtype, usage, selector, mtype, cert)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
header = struct.pack("!BBB", self.usage, self.selector, self.mtype)
file.write(header)
file.write(self.cert)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
header = parser.get_struct("BBB")
cert = parser.get_remaining()
return cls(rdclass, rdtype, header[0], header[1], header[2], cert)
