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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.
"""DNS Result Codes."""
import dns.enum
import dns.exception
class Rcode(dns.enum.IntEnum):
#: No error
NOERROR = 0
#: Format error
FORMERR = 1
#: Server failure
SERVFAIL = 2
#: Name does not exist ("Name Error" in RFC 1025 terminology).
NXDOMAIN = 3
#: Not implemented
NOTIMP = 4
#: Refused
REFUSED = 5
#: Name exists.
YXDOMAIN = 6
#: RRset exists.
YXRRSET = 7
#: RRset does not exist.
NXRRSET = 8
#: Not authoritative.
NOTAUTH = 9
#: Name not in zone.
NOTZONE = 10
#: DSO-TYPE Not Implemented
DSOTYPENI = 11
#: Bad EDNS version.
BADVERS = 16
#: TSIG Signature Failure
BADSIG = 16
#: Key not recognized.
BADKEY = 17
#: Signature out of time window.
BADTIME = 18
#: Bad TKEY Mode.
BADMODE = 19
#: Duplicate key name.
BADNAME = 20
#: Algorithm not supported.
BADALG = 21
#: Bad Truncation
BADTRUNC = 22
#: Bad/missing Server Cookie
BADCOOKIE = 23
@classmethod
def _maximum(cls):
return 4095
@classmethod
def _unknown_exception_class(cls):
return UnknownRcode
globals().update(Rcode.__members__)
class UnknownRcode(dns.exception.DNSException):
"""A DNS rcode is unknown."""
def from_text(text):
"""Convert text into an rcode.
*text*, a ``str``, the textual rcode or an integer in textual form.
Raises ``dns.rcode.UnknownRcode`` if the rcode mnemonic is unknown.
Returns an ``int``.
"""
return Rcode.from_text(text)
def from_flags(flags, ednsflags):
"""Return the rcode value encoded by flags and ednsflags.
*flags*, an ``int``, the DNS flags field.
*ednsflags*, an ``int``, the EDNS flags field.
Raises ``ValueError`` if rcode is < 0 or > 4095
Returns an ``int``.
"""
value = (flags & 0x000f) | ((ednsflags >> 20) & 0xff0)
if value < 0 or value > 4095:
raise ValueError('rcode must be >= 0 and <= 4095')
return value
def to_flags(value):
"""Return a (flags, ednsflags) tuple which encodes the rcode.
*value*, an ``int``, the rcode.
Raises ``ValueError`` if rcode is < 0 or > 4095.
Returns an ``(int, int)`` tuple.
"""
if value < 0 or value > 4095:
raise ValueError('rcode must be >= 0 and <= 4095')
v = value & 0xf
ev = (value & 0xff0) << 20
return (v, ev)
def to_text(value, tsig=False):
"""Convert rcode into text.
*value*, an ``int``, the rcode.
Raises ``ValueError`` if rcode is < 0 or > 4095.
Returns a ``str``.
"""
if tsig and value == Rcode.BADVERS:
return 'BADSIG'
return Rcode.to_text(value)