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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.""" | |
| from typing import Tuple | |
| 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 | |
| def _maximum(cls): | |
| return 4095 | |
| def _unknown_exception_class(cls): | |
| return UnknownRcode | |
| class UnknownRcode(dns.exception.DNSException): | |
| """A DNS rcode is unknown.""" | |
| def from_text(text: str) -> Rcode: | |
| """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 a ``dns.rcode.Rcode``. | |
| """ | |
| return Rcode.from_text(text) | |
| def from_flags(flags: int, ednsflags: int) -> Rcode: | |
| """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 a ``dns.rcode.Rcode``. | |
| """ | |
| value = (flags & 0x000F) | ((ednsflags >> 20) & 0xFF0) | |
| return Rcode.make(value) | |
| def to_flags(value: Rcode) -> Tuple[int, int]: | |
| """Return a (flags, ednsflags) tuple which encodes the rcode. | |
| *value*, a ``dns.rcode.Rcode``, 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: Rcode, tsig: bool = False) -> str: | |
| """Convert rcode into text. | |
| *value*, a ``dns.rcode.Rcode``, 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) | |
| ### BEGIN generated Rcode constants | |
| NOERROR = Rcode.NOERROR | |
| FORMERR = Rcode.FORMERR | |
| SERVFAIL = Rcode.SERVFAIL | |
| NXDOMAIN = Rcode.NXDOMAIN | |
| NOTIMP = Rcode.NOTIMP | |
| REFUSED = Rcode.REFUSED | |
| YXDOMAIN = Rcode.YXDOMAIN | |
| YXRRSET = Rcode.YXRRSET | |
| NXRRSET = Rcode.NXRRSET | |
| NOTAUTH = Rcode.NOTAUTH | |
| NOTZONE = Rcode.NOTZONE | |
| DSOTYPENI = Rcode.DSOTYPENI | |
| BADVERS = Rcode.BADVERS | |
| BADSIG = Rcode.BADSIG | |
| BADKEY = Rcode.BADKEY | |
| BADTIME = Rcode.BADTIME | |
| BADMODE = Rcode.BADMODE | |
| BADNAME = Rcode.BADNAME | |
| BADALG = Rcode.BADALG | |
| BADTRUNC = Rcode.BADTRUNC | |
| BADCOOKIE = Rcode.BADCOOKIE | |
| ### END generated Rcode constants | |