From 0c3e69d71a9ce79fd0a2c53ae7a9e62c8ac390c4 Mon Sep 17 00:00:00 2001
From: jdomnitz <380352+jdomnitz@users.noreply.github.com>
Date: Mon, 5 Aug 2024 21:43:41 -0400
Subject: [PATCH] resolve #2 - Implement DName records

---
 TinyDNS/Records/DNameRecord.cs    | 50 +++++++++++++++++++++++++++++++
 TinyDNS/Records/ResourceRecord.cs |  6 ++++
 TinyDNS/TinyDNS.csproj            |  2 +-
 3 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 TinyDNS/Records/DNameRecord.cs

diff --git a/TinyDNS/Records/DNameRecord.cs b/TinyDNS/Records/DNameRecord.cs
new file mode 100644
index 0000000..1c51fed
--- /dev/null
+++ b/TinyDNS/Records/DNameRecord.cs
@@ -0,0 +1,50 @@
+// TinyDNS Copyright (C) 2024 
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or any later version.
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY, without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU Affero General Public License for more details.
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using TinyDNS.Enums;
+
+namespace TinyDNS.Records
+{
+    public class DNameRecord : ResourceRecord
+    {
+        public List<string> DNameLabels { get; }
+        public string DName { get { return string.Join('.', DNameLabels); } }
+
+        internal DNameRecord(ResourceRecordHeader header, Span<byte> buffer, ref int pos) : base(header)
+        {
+            pos += 2;
+            DNameLabels = DomainParser.Read(buffer, ref pos);
+        }
+
+        public DNameRecord(string dname, List<string> labels, DNSClass @class, uint ttl) : base(labels, DNSRecordType.DNAME, @class, ttl)
+        {
+            DNameLabels = DomainParser.Parse(dname);
+        }
+
+        public DNameRecord(ResourceRecordHeader header, string rdata) : base(header)
+        {
+            DNameLabels = DomainParser.Parse(rdata);
+        }
+
+        public override bool Equals(ResourceRecord? other)
+        {
+            if (other is DNameRecord otherDName)
+                return base.Equals(other) && DNameLabels.SequenceEqual(otherDName.DNameLabels);
+            return false;
+        }
+
+        public override string ToString()
+        {
+            return base.ToString() + $"\t{DName}";
+        }
+    }
+}
diff --git a/TinyDNS/Records/ResourceRecord.cs b/TinyDNS/Records/ResourceRecord.cs
index 158cf10..0c4c6d7 100644
--- a/TinyDNS/Records/ResourceRecord.cs
+++ b/TinyDNS/Records/ResourceRecord.cs
@@ -58,6 +58,9 @@ public static ResourceRecord Parse(Span<byte> buffer, ref int pos)
                 case DNSRecordType.CNAME:
                     record = new CNameRecord(header, buffer, ref pos);
                     break;
+                case DNSRecordType.DNAME:
+                    record = new DNameRecord(header, buffer, ref pos);
+                    break;
                 case DNSRecordType.NS:
                     record = new NSRecord(header, buffer, ref pos);
                     break;
@@ -100,6 +103,9 @@ internal static ResourceRecord Parse(string line)
                 case DNSRecordType.CNAME:
                     record = new CNameRecord(header, columns[3]);
                     break;
+                case DNSRecordType.DNAME:
+                    record = new DNameRecord(header, columns[3]);
+                    break;
                 case DNSRecordType.NS:
                     record = new NSRecord(header, columns[3]);
                     break;
diff --git a/TinyDNS/TinyDNS.csproj b/TinyDNS/TinyDNS.csproj
index bbcc50d..51a834d 100644
--- a/TinyDNS/TinyDNS.csproj
+++ b/TinyDNS/TinyDNS.csproj
@@ -4,7 +4,7 @@
     <TargetFrameworks>net80</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
-    <Version>0.7.2</Version>
+    <Version>0.7.3</Version>
     <PackageLicenseExpression>AGPL-3.0-or-later</PackageLicenseExpression>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <Authors>jdomnitz</Authors>