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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;
/*
 * 3.4.2. WKS RDATA format

    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    ADDRESS                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |       PROTOCOL        |                       |
    +--+--+--+--+--+--+--+--+                       |
    |                                               |
    /                   <BIT MAP>                   /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where:

ADDRESS         An 32 bit Internet address

PROTOCOL        An 8 bit IP protocol number

<BIT MAP>       A variable length bit map.  The bit map must be a
                multiple of 8 bits long.

The WKS record is used to describe the well known services supported by
a particular protocol on a particular internet address.  The PROTOCOL
field specifies an IP protocol number, and the bit map has one bit per
port of the specified protocol.  The first bit corresponds to port 0,
the second to port 1, etc.  If the bit map does not include a bit for a
protocol of interest, that bit is assumed zero.  The appropriate values
and mnemonics for ports and protocols are specified in [RFC-1010].

For example, if PROTOCOL=TCP (6), the 26th bit corresponds to TCP port
25 (SMTP).  If this bit is set, a SMTP server should be listening on TCP
port 25; if zero, SMTP service is not supported on the specified
address.

The purpose of WKS RRs is to provide availability information for
servers for TCP and UDP.  If a server supports both TCP and UDP, or has
multiple Internet addresses, then multiple WKS RRs are used.

WKS RRs cause no additional section processing.

In master files, both ports and protocols are expressed using mnemonics
or decimal numbers.

 */
namespace Heijden.DNS
{
	public class RecordWKS : Record
	{
		public string ADDRESS;
		public int PROTOCOL;
		public byte[] BITMAP;

		public RecordWKS(RecordReader rr)
		{
			ushort length = rr.ReadShort(-2);
			ADDRESS = string.Format("{0}.{1}.{2}.{3}",
				rr.ReadByte(),
				rr.ReadByte(),
				rr.ReadByte(),
				rr.ReadByte());
			PROTOCOL = (int)rr.ReadByte();
			length -= 5;
			BITMAP = new byte[length];
			BITMAP = rr.ReadBytes(length);
		}

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

	}
}

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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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