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DNS.NET Resolver (C#)

, 11 Mar 2013 CPOL
A full implementation of a reusable DNS resolver component and a Dig.Net example application.
Article_Demo.zip
Article_Demo
DnsDig.exe
nunit.framework.dll
article_src-noexe.zip
DnsDig
DnsDig.suo
DnsDig
bin
Debug
Article_Demo.zip
DnsDig.vshost.exe.manifest
Dns
Records
NotUsed
Obsolete
Root
DnsDig.csproj.user
Doc
obj
Debug
DnsDig.AboutForm.resources
DnsDig.MainForm.resources
DnsDig.Properties.Resources.resources
Properties
Settings.settings
article_src.zip
DnsDig.suo
Article_Demo.zip
DnsDig.exe
DnsDig.pdb
DnsDig.vshost.exe
DnsDig.vshost.exe.manifest
nunit.framework.dll
Release
DnsDig.csproj.user
DesignTimeResolveAssemblyReferencesInput.cache
DnsDig.AboutForm.resources
DnsDig.csproj.GenerateResource.Cache
DnsDig.csprojResolveAssemblyReference.cache
DnsDig.exe
DnsDig.MainForm.resources
DnsDig.pdb
DnsDig.Properties.Resources.resources
TempPE
Properties.Resources.Designer.cs.dll
Settings.settings
article_src.zip.zip
DnsDig.suo
DnsDig.csproj.user
DnsExperiment.AboutForm.resources
DnsExperiment.csproj.GenerateResource.Cache
DnsExperiment.MainForm.resources
DnsExperiment.Properties.Resources.resources
Refactor
Properties.Resources.Designer.cs.dll
Settings.settings
using System;
/*
 * http://tools.ietf.org/rfc/rfc2230.txt
 * 
 * 3.1 KX RDATA format

   The KX DNS record has the following RDATA format:

    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                  PREFERENCE                   |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                   EXCHANGER                   /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

   where:

   PREFERENCE      A 16 bit non-negative integer which specifies the
                   preference given to this RR among other KX records
                   at the same owner.  Lower values are preferred.

   EXCHANGER       A <domain-name> which specifies a host willing to
                   act as a mail exchange for the owner name.

   KX records MUST cause type A additional section processing for the
   host specified by EXCHANGER.  In the event that the host processing
   the DNS transaction supports IPv6, KX records MUST also cause type
   AAAA additional section processing.

   The KX RDATA field MUST NOT be compressed.

 */
namespace Heijden.DNS
{
	public class RecordKX : Record, IComparable
	{
		public ushort PREFERENCE;
		public string EXCHANGER;

		public RecordKX(RecordReader rr)
		{
			PREFERENCE = rr.ReadUInt16();
			EXCHANGER = rr.ReadDomainName();
		}

		public override string ToString()
		{
			return string.Format("{0} {1}", PREFERENCE, EXCHANGER);
		}

		public int CompareTo(object objA)
		{
			RecordKX recordKX = objA as RecordKX;
			if (recordKX == null)
				return -1;
			else if (this.PREFERENCE > recordKX.PREFERENCE)
				return 1;
			else if (this.PREFERENCE < recordKX.PREFERENCE)
				return -1;
			else // they are the same, now compare case insensitive names
				return string.Compare(this.EXCHANGER, recordKX.EXCHANGER, true);
		}

	}
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Alphons van der Heijden
Retired Van der Heijden Holding BV
Netherlands Netherlands
I'm Alphons van der Heijden, living in Lelystad, Netherlands, Europa, Earth. And currently I'm retiring from hard working ( ;- ), owning my own company. Because I'm full of energy, and a little to young to relax ...., I don't sit down, but create and recreate software solutions, that I like. Reinventing the wheel is my second nature. My interest is in the area of Internet technologies, .NET etc. I was there in 1992 when Mosaic came out, and from that point, my life changed dramatically, and so did the world, in fact. (Y)

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