Add support for Minecraft Service DNS Records

- Add DnDns library for performing DNS queries
 - Add query method for SRV record
 - Resolve Minecraft services

This allows resolving actual server addresses for
servers using SRV records on their domain names

SRV records are basically DNS redirection eg:

  myserver.net -> srv1.myserver.net:12345

Should solve #186 reported by sammyvsparks and many others.

MinecraftClient/Protocol/Dns/Records/AaaaRecord.cs

@@ -0,0 +1,97 @@
+/**********************************************************************
+ * Copyright (c) 2010, j. montgomery                                  *
+ * All rights reserved.                                               *
+ *                                                                    *
+ * Redistribution and use in source and binary forms, with or without *
+ * modification, are permitted provided that the following conditions *
+ * are met:                                                           *
+ *                                                                    *
+ * + Redistributions of source code must retain the above copyright   *
+ *   notice, this list of conditions and the following disclaimer.    *
+ *                                                                    *
+ * + Redistributions in binary form must reproduce the above copyright*
+ *   notice, this list of conditions and the following disclaimer     *
+ *   in the documentation and/or other materials provided with the    *
+ *   distribution.                                                    *
+ *                                                                    *
+ * + Neither the name of j. montgomery's employer nor the names of    *
+ *   its contributors may be used to endorse or promote products      *
+ *   derived from this software without specific prior written        *
+ *   permission.                                                      *
+ *                                                                    *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS*
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT  *
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS  *
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE     *
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,*
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES           *
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR *
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) *
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,*
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)      *
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED*
+ * OF THE POSSIBILITY OF SUCH DAMAGE.                                 *
+ **********************************************************************/
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+
+namespace DnDns.Records
+{
+    public sealed class AaaaRecord : DnsRecordBase
+    {
+        private string m_ipAddress;
+
+        internal AaaaRecord(RecordHeader dnsHeader) : base(dnsHeader) { }
+
+        public override void ParseRecord(ref MemoryStream ms)
+        {
+            // TODO: Test and incorporate BinToHex function below
+            m_ipAddress =
+                ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2") + ":" + ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2") + ":" +
+                ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2") + ":" + ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2") + ":" +
+                ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2") + ":" + ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2") + ":" +
+                ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2") + ":" + ms.ReadByte().ToString("x2") + ms.ReadByte().ToString("x2");
+            _answer = "IPv6 Address: " + m_ipAddress;
+        }
+
+        // TODO: converted from VB.NET, test to make sure it works properly
+        private static string BinToHex(byte[] data)
+        {
+            if (data != null)
+            {
+                StringBuilder sb = new System.Text.StringBuilder(1024);
+                for (int i = 0; i < data.Length; i++)
+                {
+                    sb.Append(data[i].ToString("X2"));
+                }
+                return sb.ToString();
+            }
+            else
+            {
+                return null;
+            }
+        }
+        
+        // TODO: converted from VB.NET, test to make sure it works properly
+        private static byte[] HexToBin(string s)
+        {
+            int arraySize = s.Length / 2;
+            byte[] bytes = new byte[arraySize - 1];
+            int counter = 0;
+
+            for (int i = 0; i < s.Length - 1; i = 2)
+            {
+                string hexValue = s.Substring(i, 2);
+
+                // Tell convert to interpret the string as a 16 bit hex value
+                int intValue = Convert.ToInt32(hexValue, 16);
+                // Convert the integer to a byte and store it in the array
+                bytes[counter] = Convert.ToByte(intValue);
+                counter += 1;
+            }
+            return bytes;
+        }
+    }
+}