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DNS.NET Resolver (C#)

, 11 Mar 2013
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;
using System.Diagnostics;

using System.Threading;
using System.Globalization;

using Heijden.DNS;

namespace DnsDig
{
	class Dig
	{
		public Resolver resolver;

		public Dig()
		{
			resolver = new Resolver();
			resolver.OnVerbose += new Resolver.VerboseEventHandler(resolver_OnVerbose);
		}

		private void resolver_OnVerbose(object sender, Resolver.VerboseEventArgs e)
		{
			Console.WriteLine(e.Message);
		}

		public void DigIt(string name)
		{
			DigIt(name, QType.A, QClass.IN);
		}

		public void DigIt(string name, QType qtype)
		{
			DigIt(name, qtype, QClass.IN);
		}

		private delegate void DigItDelegate(string name, QType qtype, QClass qclass);
		public void BeginDigIt(string name, QType qtype, QClass qclass)
		{
			DigItDelegate d = new DigItDelegate(DigIt);
			d.BeginInvoke(name, qtype, qclass,null,null);
		}

		public void DigIt(string name, QType qtype, QClass qclass)
		{
			Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US", false);
			Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US", false);

			Console.WriteLine("; <<>> Dig.Net {0} <<>> @{1} {2} {3}", resolver.Version, resolver.DnsServer, qtype, name);
			Console.WriteLine(";; global options: printcmd");

			Stopwatch sw = new Stopwatch();

			sw.Start();
			Response response = resolver.Query(name, qtype, qclass);
			sw.Stop();

			if(response.Error != "")
			{
				Console.WriteLine(";; " + response.Error);
				return;
			}

			Console.WriteLine(";; Got answer:");

			Console.WriteLine(";; ->>HEADER<<- opcode: {0}, status: {1}, id: {2}",
				response.header.OPCODE,
				response.header.RCODE,
				response.header.ID);
			Console.WriteLine(";; flags: {0}{1}{2}{3}; QUERY: {4}, ANSWER: {5}, AUTHORITY: {6}, ADDITIONAL: {7}",
				response.header.QR ? " qr" : "",
				response.header.AA ? " aa" : "",
				response.header.RD ? " rd" : "",
				response.header.RA ? " ra" : "",
				response.header.QDCOUNT,
				response.header.ANCOUNT,
				response.header.NSCOUNT,
				response.header.ARCOUNT);
			Console.WriteLine("");

			if (response.header.QDCOUNT > 0)
			{
				Console.WriteLine(";; QUESTION SECTION:");
				foreach (Question question in response.Questions)
					Console.WriteLine(";{0}" , question);
				Console.WriteLine("");
			}

			if (response.header.ANCOUNT > 0)
			{
				Console.WriteLine(";; ANSWER SECTION:");
				foreach (AnswerRR answerRR in response.Answers)
					Console.WriteLine(answerRR);
				Console.WriteLine("");
			}

			if (response.header.NSCOUNT > 0)
			{
				Console.WriteLine(";; AUTHORITY SECTION:");
				foreach (AuthorityRR authorityRR in response.Authorities)
					Console.WriteLine(authorityRR);
				Console.WriteLine("");
			}

			if (response.header.ARCOUNT > 0)
			{
				Console.WriteLine(";; ADDITIONAL SECTION:");
				foreach (AdditionalRR additionalRR in response.Additionals)
					Console.WriteLine(additionalRR);
				Console.WriteLine("");
			}

			Console.WriteLine(";; Query time: {0} msec", sw.ElapsedMilliseconds);
			Console.WriteLine(";; SERVER: {0}#{1}({2})" ,response.Server.Address,response.Server.Port,response.Server.Address);
			Console.WriteLine(";; WHEN: " + response.TimeStamp.ToString("ddd MMM dd HH:mm:ss yyyy",new System.Globalization.CultureInfo("en-US")));
			Console.WriteLine(";; MSG SIZE rcvd: " + response.MessageSize);
		}
	}
}

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License

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

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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