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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;

namespace Heijden.DNS
{
	/*
	3.3.9. MX RDATA format

		+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
		|                  PREFERENCE                   |
		+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
		/                   EXCHANGE                    /
		/                                               /
		+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

	where:

	PREFERENCE      A 16 bit integer which specifies the preference given to
					this RR among others at the same owner.  Lower values
					are preferred.

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

	MX records cause type A additional section processing for the host
	specified by EXCHANGE.  The use of MX RRs is explained in detail in
	[RFC-974].
	*/

	public class RecordMX : Record, IComparable
	{
		public ushort PREFERENCE;
		public string EXCHANGE;

		public RecordMX(RecordReader rr)
		{
			PREFERENCE = rr.ReadUInt16();
			EXCHANGE = rr.ReadDomainName();
		}

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

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

	}
}

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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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