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//! Extended DNS Error
//------------ Extended Error Code -------------------------------------------
int_enum! {
/// Extended DNS error codes.
///
/// A complementary data can be put in EDNS opt, providing
/// additional information about the cause of DNS errors. Defined
/// in [RFC 8914]. Current registered values can be found in [IANA
/// registry].
///
/// [RFC 8914]: https://tools.ietf.org/html/rfc8914
/// [IANA registry]: https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#extended-dns-error-codes
=>
ExtendedErrorCode, u16;
/// The error in question falls into a category that does not
/// match known extended error codes. Implementations SHOULD
/// include an EXTRA-TEXT value to augment this error code with
/// additional information.
(OTHER => 0, "Other Error")
/// The resolver attempted to perform DNSSEC validation, but a DNSKEY
/// RRset contained only unsupported DNSSEC algorithms.
(UNSUPPORTED_DNSKEY_ALGORITHM => 1, "Unsupported DNSKEY Algorithm")
/// The resolver attempted to perform DNSSEC validation, but a DS
/// RRset contained only unsupported Digest Types.
(UNSUPPORTED_DS_DIGEST_TYPE => 2, "Unsupported DS Digest Type")
/// The resolver was unable to resolve the answer within its time
/// limits and decided to answer with previously cached data
/// instead of answering with an error. This is typically caused
/// by problems communicating with an authoritative server,
/// possibly as result of a denial of service (DoS) attack against
/// another network. (See also Code 19.)
(STALE_ANSWER => 3, "Stale Answer")
/// For policy reasons (legal obligation or malware filtering, for
/// instance), an answer was forged. Note that this should be
/// used when an answer is still provided, not when failure
/// codes are returned instead. See Blocked (15), Censored
/// (16), and Filtered (17) for use when returning other
/// response codes.
(FORGED_ANSWER => 4, "Forged Answer")
/// The resolver attempted to perform DNSSEC validation, but
/// validation ended in the Indeterminate state [RFC 4035].
///
/// [RFC 4035]: https://tools.ietf.org/html/rfc4035
(DNSSEC_INDETERMINATE => 5, "DNSSEC Indeterminate")
/// The resolver attempted to perform DNSSEC validation, but
/// validation ended in the Bogus state.
(DNSSEC_BOGUS => 6, "DNSSEC Bogus")
/// The resolver attempted to perform DNSSEC validation, but no
/// signatures are presently valid and some (often all) are
/// expired.
(SIGNATURE_EXPIRED => 7, "Signature Expired")
/// The resolver attempted to perform DNSSEC validation, but no
/// signatures are presently valid and at least some are not yet
/// valid.
(SIGNATURE_NOT_YET_VALID => 8, "Signature Not Yet Valid")
/// A DS record existed at a parent, but no supported matching
/// DNSKEY record could be found for the child.
(DNSKEY_MISSING => 9, "DNSKEY Missing")
/// The resolver attempted to perform DNSSEC validation, but no
/// RRSIGs could be found for at least one RRset where RRSIGs were
/// expected.
(RRSIGS_MISSING => 10, "RRSIGs Missing")
/// The resolver attempted to perform DNSSEC validation, but no
/// Zone Key Bit was set in a DNSKEY.
(NO_ZONE_KEY_BIT_SET => 11, "No Zone Key Bit Set")
/// The resolver attempted to perform DNSSEC validation, but the
/// requested data was missing and a covering NSEC or NSEC3 was
/// not provided.
(NSEC_MISSING => 12, "NSEC Missing")
/// The resolver is returning the SERVFAIL RCODE from its cache.
(CACHED_ERROR => 13, "Cached Error")
/// The server is unable to answer the query, as it was not fully
/// functional when the query was received.
(NOT_READY => 14, "Not Ready")
/// The server is unable to respond to the request because the
/// domain is on a blocklist due to an internal security policy
/// imposed by the operator of the server resolving or forwarding
/// the query.
(BLOCKED => 15, "Blocked")
/// The server is unable to respond to the request because the
/// domain is on a blocklist due to an external requirement
/// imposed by an entity other than the operator of the server
/// resolving or forwarding the query. Note that how the imposed
/// policy is applied is irrelevant (in-band DNS filtering, court
/// order, etc.).
(CENSORED => 16, "Censored")
/// The server is unable to respond to the request because the
/// domain is on a blocklist as requested by the client.
/// Functionally, this amounts to "you requested that we filter
/// domains like this one."
(FILTERED => 17, "Filtered")
/// An authoritative server or recursive resolver that receives a
/// query from an "unauthorized" client can annotate its REFUSED
/// message with this code. Examples of "unauthorized" clients are
/// recursive queries from IP addresses outside the network,
/// blocklisted IP addresses, local policy, etc.
(PROHIBITED => 18, "Prohibited")
/// The resolver was unable to resolve an answer within its
/// configured time limits and decided to answer with a previously
/// cached NXDOMAIN answer instead of answering with an error.
/// This may be caused, for example, by problems communicating
/// with an authoritative server, possibly as result of a denial
/// of service (DoS) attack against another network. (See also
/// Code 3.)
(STALE_NXDOMAIN_ANSWER => 19, "Stale NXDomain Answer")
/// An authoritative server that receives a query with the
/// Recursion Desired (RD) bit clear, or when it is not configured
/// for recursion for a domain for which it is not authoritative,
/// SHOULD include this EDE code in the REFUSED response. A
/// resolver that receives a query with the RD bit clear SHOULD
/// include this EDE code in the REFUSED response.
(NOT_AUTHORITATIVE => 20, "Not Authoritative")
/// The requested operation or query is not supported.
(NOT_SUPPORTED => 21, "Not Supported")
/// The resolver could not reach any of the authoritative name
/// servers (or they potentially refused to reply).
(NO_REACHABLE_AUTHORITY => 22, "No Reachable Authority")
/// An unrecoverable error occurred while communicating with
/// another server.
(NETWORK_ERROR => 23, "Network Error")
/// The authoritative server cannot answer with data for a zone it
/// is otherwise configured to support. Examples of this include
/// its most recent zone being too old or having expired.
(INVALID_DATA => 24, "Invalid Data")
/// The requested resource record type should not appear in a query.
(INVALID_QUERY_TYPE => 30, "Invalid Query Type")
}
/// Start of the private range for EDE codes.
///
/// ```text
/// Registration Procedures:
/// o 0 - 49151: First come, first served.
/// o 49152 - 65535: Private use.
/// ```
pub const EDE_PRIVATE_RANGE_BEGIN: u16 = 49152;
int_enum_str_with_prefix!(
ExtendedErrorCode,
"EDE",
b"EDE",
u16,
"unknown error code"
);