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/*
* Copyright (C) 2015 Benjamin Fry <benjaminfry@me.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// there is not much to format in this file, and we don't want rustfmt to mess up the comments
//! All defined response codes in DNS
use std::fmt;
use std::fmt::{Display, Formatter};
/// The status code of the response to a query.
///
/// [RFC 1035, DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION, November 1987](https://tools.ietf.org/html/rfc1035)
///
/// ```text
/// RCODE Response code - this 4 bit field is set as part of
/// responses. The values have the following
/// interpretation:
///
/// 0 No error condition
///
/// 1 Format error - The name server was
/// unable to interpret the query.
///
/// 2 Server failure - The name server was
/// unable to process this query due to a
/// problem with the name server.
///
/// 3 Name Error - Meaningful only for
/// responses from an authoritative name
/// server, this code signifies that the
/// domain name referenced in the query does
/// not exist.
///
/// 4 Not Implemented - The name server does
/// not support the requested kind of query.
///
/// 5 Refused - The name server refuses to
/// perform the specified operation for
/// policy reasons. For example, a name
/// server may not wish to provide the
/// information to the particular requester,
/// or a name server may not wish to perform
/// a particular operation (e.g., zone
/// transfer) for particular data.
///
/// 6-15 Reserved for future use.
/// ```
#[derive(Debug, Eq, PartialEq, PartialOrd, Copy, Clone, Hash)]
#[allow(dead_code)]
pub enum ResponseCode {
/// No Error [RFC 1035](https://tools.ietf.org/html/rfc1035)
NoError,
/// Format Error [RFC 1035](https://tools.ietf.org/html/rfc1035)
FormErr,
/// Server Failure [RFC 1035](https://tools.ietf.org/html/rfc1035)
ServFail,
/// Non-Existent Domain [RFC 1035](https://tools.ietf.org/html/rfc1035)
NXDomain,
/// Not Implemented [RFC 1035](https://tools.ietf.org/html/rfc1035)
NotImp,
/// Query Refused [RFC 1035](https://tools.ietf.org/html/rfc1035)
Refused,
/// Name Exists when it should not [RFC 2136](https://tools.ietf.org/html/rfc2136)
YXDomain,
/// RR Set Exists when it should not [RFC 2136](https://tools.ietf.org/html/rfc2136)
YXRRSet,
/// RR Set that should exist does not [RFC 2136](https://tools.ietf.org/html/rfc2136)
NXRRSet,
/// Server Not Authoritative for zone [RFC 2136](https://tools.ietf.org/html/rfc2136)
/// or Not Authorized [RFC 2845](https://tools.ietf.org/html/rfc2845)
NotAuth,
/// Name not contained in zone [RFC 2136](https://tools.ietf.org/html/rfc2136)
NotZone,
/// Bad OPT Version [RFC 6891](https://tools.ietf.org/html/rfc6891#section-9)
BADVERS,
/// TSIG Signature Failure [RFC 2845](https://tools.ietf.org/html/rfc2845)
BADSIG,
/// Key not recognized [RFC 2845](https://tools.ietf.org/html/rfc2845)
BADKEY,
/// Signature out of time window [RFC 2845](https://tools.ietf.org/html/rfc2845)
BADTIME,
/// Bad TKEY Mode [RFC 2930](https://tools.ietf.org/html/rfc2930#section-2.6)
BADMODE,
/// Duplicate key name [RFC 2930](https://tools.ietf.org/html/rfc2930#section-2.6)
BADNAME,
/// Algorithm not supported [RFC 2930](https://tools.ietf.org/html/rfc2930#section-2.6)
BADALG,
/// Bad Truncation [RFC 4635](https://tools.ietf.org/html/rfc4635#section-4)
BADTRUNC,
/// Bad/missing server cookie [draft-ietf-dnsop-cookies](https://tools.ietf.org/html/draft-ietf-dnsop-cookies-10)
BADCOOKIE,
// 24-3840 Unassigned
// 3841-4095 Reserved for Private Use [RFC6895]
// 4096-65534 Unassigned
// 65535 Reserved, can be allocated by Standards Action [RFC6895]
/// An unknown or unregisterd response code was received.
Unknown(u16),
}
impl ResponseCode {
/// returns the lower 4 bits of the response code (for the original header portion of the code)
pub fn low(self) -> u8 {
(u16::from(self) & 0x000F) as u8
}
/// returns the high 8 bits for the EDNS portion of the response code
pub fn high(self) -> u8 {
((u16::from(self) & 0x0FF0) >> 4) as u8
}
/// DNS can not store the entire space of ResponseCodes in 4 bit space of the Header, this function
/// allows for a initial value of the first 4 bits to be set.
///
/// After the EDNS is read, the entire ResponseCode (12 bits) can be reconstructed for the full ResponseCode.
pub fn from_low(low: u8) -> Self {
((u16::from(low)) & 0x000F).into()
}
/// Combines the EDNS high and low from the Header to produce the Extended ResponseCode
pub fn from(high: u8, low: u8) -> Self {
((u16::from(high) << 4) | ((u16::from(low)) & 0x000F)).into()
}
/// Transforms the response code into the human message
pub fn to_str(self) -> &'static str {
match self {
Self::NoError => "No Error",
Self::FormErr => "Form Error", // 1 FormErr Format Error [RFC1035]
Self::ServFail => "Server Failure", // 2 ServFail Server Failure [RFC1035]
Self::NXDomain => "Non-Existent Domain", // 3 NXDomain Non-Existent Domain [RFC1035]
Self::NotImp => "Not Implemented", // 4 NotImp Not Implemented [RFC1035]
Self::Refused => "Query Refused", // 5 Refused Query Refused [RFC1035]
Self::YXDomain => "Name should not exist", // 6 YXDomain Name Exists when it should not [RFC2136][RFC6672]
Self::YXRRSet => "RR Set should not exist", // 7 YXRRSet RR Set Exists when it should not [RFC2136]
Self::NXRRSet => "RR Set does not exist", // 8 NXRRSet RR Set that should exist does not [RFC2136]
Self::NotAuth => "Not authorized", // 9 NotAuth Server Not Authoritative for zone [RFC2136]
Self::NotZone => "Name not in zone", // 10 NotZone Name not contained in zone [RFC2136]
Self::BADVERS => "Bad option verions", // 16 BADVERS Bad OPT Version [RFC6891]
Self::BADSIG => "TSIG Failure", // 16 BADSIG TSIG Signature Failure [RFC2845]
Self::BADKEY => "Key not recognized", // 17 BADKEY Key not recognized [RFC2845]
Self::BADTIME => "Signature out of time window", // 18 BADTIME Signature out of time window [RFC2845]
Self::BADMODE => "Bad TKEY mode", // 19 BADMODE Bad TKEY Mode [RFC2930]
Self::BADNAME => "Duplicate key name", // 20 BADNAME Duplicate key name [RFC2930]
Self::BADALG => "Algorithm not supported", // 21 BADALG Algorithm not supported [RFC2930]
Self::BADTRUNC => "Bad truncation", // 22 BADTRUNC Bad Truncation [RFC4635]
Self::BADCOOKIE => "Bad server cookie", // 23 BADCOOKIE (TEMPORARY - registered 2015-07-26, expires 2016-07-26) Bad/missing server cookie [draft-ietf-dnsop-cookies]
Self::Unknown(_) => "Unknown response code",
}
}
}
impl Default for ResponseCode {
fn default() -> Self {
Self::NoError
}
}
impl Display for ResponseCode {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
f.write_str(self.to_str())
}
}
/// Convert from `ResponseCode` to `u16`
///
/// ```
/// use std::convert::From;
/// use trust_dns_proto::op::response_code::ResponseCode;
///
/// let var: ResponseCode = From::from(0);
/// assert_eq!(ResponseCode::NoError, var);
///
/// let var: ResponseCode = 0.into();
/// assert_eq!(ResponseCode::NoError, var);
/// ```
impl From<ResponseCode> for u16 {
fn from(rt: ResponseCode) -> Self {
match rt {
ResponseCode::NoError => 0, // 0 NoError No Error [RFC1035]
ResponseCode::FormErr => 1, // 1 FormErr Format Error [RFC1035]
ResponseCode::ServFail => 2, // 2 ServFail Server Failure [RFC1035]
ResponseCode::NXDomain => 3, // 3 NXDomain Non-Existent Domain [RFC1035]
ResponseCode::NotImp => 4, // 4 NotImp Not Implemented [RFC1035]
ResponseCode::Refused => 5, // 5 Refused Query Refused [RFC1035]
ResponseCode::YXDomain => 6, // 6 YXDomain Name Exists when it should not [RFC2136][RFC6672]
ResponseCode::YXRRSet => 7, // 7 YXRRSet RR Set Exists when it should not [RFC2136]
ResponseCode::NXRRSet => 8, // 8 NXRRSet RR Set that should exist does not [RFC2136]
ResponseCode::NotAuth => 9, // 9 NotAuth Server Not Authoritative for zone [RFC2136]
ResponseCode::NotZone => 10, // 10 NotZone Name not contained in zone [RFC2136]
//
// 11-15 Unassigned
//
// 16 BADVERS Bad OPT Version [RFC6891]
// 16 BADSIG TSIG Signature Failure [RFC2845]
ResponseCode::BADVERS | ResponseCode::BADSIG => 16,
ResponseCode::BADKEY => 17, // 17 BADKEY Key not recognized [RFC2845]
ResponseCode::BADTIME => 18, // 18 BADTIME Signature out of time window [RFC2845]
ResponseCode::BADMODE => 19, // 19 BADMODE Bad TKEY Mode [RFC2930]
ResponseCode::BADNAME => 20, // 20 BADNAME Duplicate key name [RFC2930]
ResponseCode::BADALG => 21, // 21 BADALG Algorithm not supported [RFC2930]
ResponseCode::BADTRUNC => 22, // 22 BADTRUNC Bad Truncation [RFC4635]
// 23 BADCOOKIE (TEMPORARY - registered 2015-07-26, expires 2016-07-26) Bad/missing server cookie [draft-ietf-dnsop-cookies]
ResponseCode::BADCOOKIE => 23,
ResponseCode::Unknown(code) => code,
}
}
}
/// Convert from `u16` to `ResponseCode`
///
/// ```
/// use std::convert::From;
/// use trust_dns_proto::op::response_code::ResponseCode;
///
/// let var: u16 = From::from(ResponseCode::NoError);
/// assert_eq!(0, var);
///
/// let var: u16 = ResponseCode::NoError.into();
/// assert_eq!(0, var);
/// ```
impl From<u16> for ResponseCode {
#[allow(clippy::unimplemented)]
fn from(value: u16) -> Self {
match value {
0 => Self::NoError, // 0 NoError No Error [RFC1035]
1 => Self::FormErr, // 1 FormErr Format Error [RFC1035]
2 => Self::ServFail, // 2 ServFail Server Failure [RFC1035]
3 => Self::NXDomain, // 3 NXDomain Non-Existent Domain [RFC1035]
4 => Self::NotImp, // 4 NotImp Not Implemented [RFC1035]
5 => Self::Refused, // 5 Refused Query Refused [RFC1035]
6 => Self::YXDomain, // 6 YXDomain Name Exists when it should not [RFC2136][RFC6672]
7 => Self::YXRRSet, // 7 YXRRSet RR Set Exists when it should not [RFC2136]
8 => Self::NXRRSet, // 8 NXRRSet RR Set that should exist does not [RFC2136]
9 => Self::NotAuth, // 9 NotAuth Server Not Authoritative for zone [RFC2136]
10 => Self::NotZone, // 10 NotZone Name not contained in zone [RFC2136]
// this looks to be backwards compat for 4 bit ResponseCodes.
// 16 BADVERS Bad OPT Version [RFC6891]
// 16 => ResponseCode::BADVERS,
16 => Self::BADSIG, // 16 BADSIG TSIG Signature Failure [RFC2845]
17 => Self::BADKEY, // 17 BADKEY Key not recognized [RFC2845]
18 => Self::BADTIME, // 18 BADTIME Signature out of time window [RFC2845]
19 => Self::BADMODE, // 19 BADMODE Bad TKEY Mode [RFC2930]
20 => Self::BADNAME, // 20 BADNAME Duplicate key name [RFC2930]
21 => Self::BADALG, // 21 BADALG Algorithm not supported [RFC2930]
22 => Self::BADTRUNC, // 22 BADTRUNC Bad Truncation [RFC4635]
23 => Self::BADCOOKIE, // 23 BADCOOKIE (TEMPORARY - registered 2015-07-26, expires 2016-07-26) Bad/missing server cookie [draft-ietf-dnsop-cookies]
code => Self::Unknown(code),
}
}
}