done

Netch/3rd/DnsClient.NET/Protocol/AfsDbRecord.cs

@@ -0,0 +1,83 @@
+using System;
+namespace DnsClient.Protocol
+{
+    /* https://tools.ietf.org/html/rfc1183#section-1, https://tools.ietf.org/html/rfc5864
+    1. AFS Data Base location
+
+       This section defines an extension of the DNS to locate servers both
+       for AFS (AFS is a registered trademark of Transarc Corporation) and
+       for the Open Software Foundation's (OSF) Distributed Computing
+       Environment (DCE) authenticated naming system using HP/Apollo's NCA,
+       both to be components of the OSF DCE.  The discussion assumes that
+       the reader is familiar with AFS [5] and NCA [6].
+
+       The AFS (originally the Andrew File System) system uses the DNS to
+       map from a domain name to the name of an AFS cell database server.
+       The DCE Naming service uses the DNS for a similar function: mapping
+       from the domain name of a cell to authenticated name servers for that
+       cell.  The method uses a new RR type with mnemonic AFSDB and type
+       code of 18 (decimal).
+
+       AFSDB has the following format:
+
+       <owner> <ttl> <class> AFSDB <subtype> <hostname>
+    */
+
+    /// <summary>
+    /// A <see cref="DnsResourceRecord"/> representing an AFS database location.
+    /// </summary>
+    /// <seealso href="https://tools.ietf.org/html/rfc1183#section-1">RFC 1183</seealso>
+    /// <seealso href="https://tools.ietf.org/html/rfc5864">RFC 5864</seealso>
+    public class AfsDbRecord : DnsResourceRecord
+    {
+        /// <summary>
+        /// Gets the <see cref="AfsType"/>.
+        /// </summary>
+        /// <value>
+        /// The sub type.
+        /// </value>
+        public AfsType SubType { get; }
+
+        /// <summary>
+        /// Gets the hostname.
+        /// </summary>
+        /// <value>
+        /// The hostname.
+        /// </value>
+        public DnsString Hostname { get; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AfsDbRecord"/> class.
+        /// </summary>
+        /// <param name="info">The information.</param>
+        /// <param name="type">The type.</param>
+        /// <param name="name">The name.</param>
+        /// <exception cref="System.ArgumentNullException">If <paramref name="info"/> or <paramref name="name"/> is null.</exception>
+        public AfsDbRecord(ResourceRecordInfo info, AfsType type, DnsString name) : base(info)
+        {
+            SubType = type;
+            Hostname = name ?? throw new ArgumentNullException(nameof(name));
+        }
+
+        private protected override string RecordToString()
+        {
+            return $"{(int)SubType} {Hostname}";
+        }
+    }
+
+    /// <summary>
+    /// Type used by <see cref="AfsDbRecord"/>.
+    /// </summary>
+    public enum AfsType
+    {
+        /// <summary>
+        /// AFS is a registered trademark of Transarc Corporation
+        /// </summary>
+        Afs = 1,
+
+        /// <summary>
+        /// The Distributed Computing Environment
+        /// </summary>
+        Dce = 2
+    }
+}