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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# Copyright (C) 2001-2017 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.rdata
class TSIG(dns.rdata.Rdata):
"""TSIG record"""
__slots__ = ['algorithm', 'time_signed', 'fudge', 'mac',
'original_id', 'error', 'other']
def __init__(self, rdclass, rdtype, algorithm, time_signed, fudge, mac,
original_id, error, other):
"""Initialize a TSIG rdata.
*rdclass*, an ``int`` is the rdataclass of the Rdata.
*rdtype*, an ``int`` is the rdatatype of the Rdata.
*algorithm*, a ``dns.name.Name``.
*time_signed*, an ``int``.
*fudge*, an ``int`.
*mac*, a ``bytes``
*original_id*, an ``int``
*error*, an ``int``
*other*, a ``bytes``
"""
super().__init__(rdclass, rdtype)
object.__setattr__(self, 'algorithm', algorithm)
object.__setattr__(self, 'time_signed', time_signed)
object.__setattr__(self, 'fudge', fudge)
object.__setattr__(self, 'mac', dns.rdata._constify(mac))
object.__setattr__(self, 'original_id', original_id)
object.__setattr__(self, 'error', error)
object.__setattr__(self, 'other', dns.rdata._constify(other))
def to_text(self, origin=None, relativize=True, **kw):
algorithm = self.algorithm.choose_relativity(origin, relativize)
return f"{algorithm} {self.fudge} {self.time_signed} " + \
f"{len(self.mac)} {dns.rdata._base64ify(self.mac, 0)} " + \
f"{self.original_id} {self.error} " + \
f"{len(self.other)} {dns.rdata._base64ify(self.other, 0)}"
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
self.algorithm.to_wire(file, None, origin, False)
file.write(struct.pack('!HIHH',
(self.time_signed >> 32) & 0xffff,
self.time_signed & 0xffffffff,
self.fudge,
len(self.mac)))
file.write(self.mac)
file.write(struct.pack('!HHH', self.original_id, self.error,
len(self.other)))
file.write(self.other)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
algorithm = parser.get_name(origin)
(time_hi, time_lo, fudge) = parser.get_struct('!HIH')
time_signed = (time_hi << 32) + time_lo
mac = parser.get_counted_bytes(2)
(original_id, error) = parser.get_struct('!HH')
other = parser.get_counted_bytes(2)
return cls(rdclass, rdtype, algorithm, time_signed, fudge, mac,
original_id, error, other)