// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace Microsoft.Extensions.ServiceDiscovery.Dns.Resolver;
 
/// <summary>
/// The response code (RCODE) in a DNS query response.
/// </summary>
internal enum QueryResponseCode : byte
{
    /// <summary>
    /// No error condition
    /// </summary>
    NoError = 0,
 
    /// <summary>
    /// The name server was unable to interpret the query.
    /// </summary>
    FormatError = 1,
 
    /// <summary>
    /// The name server was unable to process this query due to a problem with the name server.
    /// </summary>
    ServerFailure = 2,
 
    /// <summary>
    /// Meaningful only for responses from an authoritative name server, this
    /// code signifies that the domain name referenced in the query does not
    /// exist.
    /// </summary>
    NameError = 3,
 
    /// <summary>
    /// The name server does not support the requested kind of query.
    /// </summary>
    NotImplemented = 4,
 
    /// <summary>
    /// The name server refuses to perform the specified operation for policy reasons.
    /// </summary>
    Refused = 5,
}