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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 base64
import struct
import dns.exception
import dns.immutable
import dns.rcode
import dns.rdata
@dns.immutable.immutable
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)
self.algorithm = self._as_name(algorithm)
self.time_signed = self._as_uint48(time_signed)
self.fudge = self._as_uint16(fudge)
self.mac = self._as_bytes(mac)
self.original_id = self._as_uint16(original_id)
self.error = dns.rcode.Rcode.make(error)
self.other = self._as_bytes(other)
def to_text(self, origin=None, relativize=True, **kw):
algorithm = self.algorithm.choose_relativity(origin, relativize)
error = dns.rcode.to_text(self.error, True)
text = (
f"{algorithm} {self.time_signed} {self.fudge} "
+ f"{len(self.mac)} {dns.rdata._base64ify(self.mac, 0)} "
+ f"{self.original_id} {error} {len(self.other)}"
)
if self.other:
text += f" {dns.rdata._base64ify(self.other, 0)}"
return text
@classmethod
def from_text(
cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
):
algorithm = tok.get_name(relativize=False)
time_signed = tok.get_uint48()
fudge = tok.get_uint16()
mac_len = tok.get_uint16()
mac = base64.b64decode(tok.get_string())
if len(mac) != mac_len:
raise SyntaxError("invalid MAC")
original_id = tok.get_uint16()
error = dns.rcode.from_text(tok.get_string())
other_len = tok.get_uint16()
if other_len > 0:
other = base64.b64decode(tok.get_string())
if len(other) != other_len:
raise SyntaxError("invalid other data")
else:
other = b""
return cls(
rdclass,
rdtype,
algorithm,
time_signed,
fudge,
mac,
original_id,
error,
other,
)
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()
time_signed = parser.get_uint48()
fudge = parser.get_uint16()
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,
)
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