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Extreme Optimization #1.1: Mapping IP addresses to country codes.

, 30 May 2003
Highly optimized classes for looking up the country code corresponding to an IP address
ipcountrylookup.zip
App.ico
bin
ConsoleApplication1
Extreme.IPCountryLookup.exe
obj
resources
Debug
Release
Debug
Release
temp
TempPE
temp
apnic.latest
arin.latest
lacnic.latest
ripencc.latest
ipcountrylookupsource.zip
App.ico
Extreme.IPCountryLookup.exe
// Copyright � 2003 by Jeffrey Sax
// All rights reserved.
// http://www.extremeoptimization.com/
// Filename: Test.cs
// Last modified: May 28, 2003.

using System;
using System.Collections;
using System.IO;
using System.Net;

namespace Extreme.IPCountryLookup
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	class Test
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			Int32 indexLength;
			if (args.Length < 1)
				indexLength = 16;
			else
				indexLength = Int32.Parse(args[0]);
			//ITCTest(1);
			//ITCTest(8);
			//ITCTest(12);
			ITCTest(indexLength);
			ITCTest2();
			Console.ReadLine();
		}
		/// <summary>
		/// This function lets you look up manually entered IP addresses.
		/// The function exits when you enter an empty line.
		/// </summary>
		public static void MyTest()
		{
			String host;
			Console.WriteLine("Enter host name or IP address:");
			while ((host = Console.ReadLine()).Length > 1)
			{
				try
				{
					TestIPCountryLookup(host);
				}
				catch (Exception e)
				{
					Console.Write("Error: ");
					Console.WriteLine(e.Message);
				}
			}
		}
		

		public static ArrayList LoadIpList(string name)
		{
			ArrayList result = new ArrayList(10000);

			FileStream fs = new FileStream(name, FileMode.Open);
			StreamReader sr = new StreamReader(fs);

			string line;

			while ((line = sr.ReadLine()) != null)
			{
				result.Add(line);
			}

			sr.Close();
			fs.Close();
	    
			return result;
		}

		static IPCountryTable table;

		public static void ITCTest(Int32 indexLength)
		{
			long initialmemory = GC.GetTotalMemory(true);
			Extreme.HiResTimer timer = new Extreme.HiResTimer();

			timer.Reset();
			timer.Start();
			table = new IPCountryTable(indexLength);
			table.LoadStatisticsFile(@"..\..\resources\ripencc.latest", true);
			table.LoadStatisticsFile(@"..\..\resources\arin.latest", true);
			table.LoadStatisticsFile(@"..\..\resources\apnic.latest", false);
			table.LoadStatisticsFile(@"..\..\resources\lacnic.latest", true);
			timer.Stop();
			Single dataLoadTime = timer.ElapsedSeconds;
			GC.Collect();
			GC.WaitForPendingFinalizers();
			long afterloadmemory = GC.GetTotalMemory(true);

			timer.Reset();
			timer.Start();
			ArrayList ips = LoadIpList(@"..\..\iplist.txt");
			timer.Stop();
			Single sampleLoadTime = timer.ElapsedSeconds;

			Console.WriteLine("Max memory taken by the tables: {0}KB", (afterloadmemory - initialmemory)/1024);
			Console.WriteLine("IP tables loaded in {0} ({1} networks)", dataLoadTime, table.NetworkCodeCount );
			Console.WriteLine("IP list loaded in {0} ({1} ip addresses)", 
				sampleLoadTime, 
				ips.Count);

			Console.WriteLine("Testing ip look-up speed...");

			timer.Reset();
			timer.Start();
			Int32 count = ips.Count;
			for (Int32 iteration = 0; iteration < 10; iteration++)
				foreach(String ip in ips)
					table.GetCountry(ip);
			timer.Stop();
			Single lookupTime = timer.ElapsedSeconds;

			Console.WriteLine("{0} addresses were translated in {1}s ({2} ip/s)", 
				ips.Count,  lookupTime,
				10 * (int)(ips.Count / lookupTime) );
			Console.WriteLine("Duration: {0}", lookupTime);

			Console.WriteLine("Country code for 195.149.21.72: {0}", table.GetCountry("195.149.21.72"));
			Console.WriteLine("Country code for 81.3.59.134: {0}", table.GetCountry("81.3.59.134"));
			Console.WriteLine("Country code for 194.134.233.72: {0}", table.GetCountry("194.134.233.72"));
		}

		/// <summary>
		/// A short test of several known IP - country code combinations.
		/// </summary>
		public static void ITCTest2()
		{
			Console.WriteLine("217.224.0.0 = {0}", table.GetCountry("217.224.0.0"));
			Console.WriteLine("217.224.133.25 = {0}", table.GetCountry("217.224.133.25"));

			Console.WriteLine("217.208.23.45 = {0} (SE)", table.GetCountry("217.208.23.45"));
			Console.WriteLine("195.96.96.111 = {0} (NL)", table.GetCountry("195.96.96.111"));
			Console.WriteLine("81.16.128.23 = {0} (RU)", table.GetCountry("81.16.128.23"));
			Console.WriteLine("62.4.160.87 = {0} (BE)", table.GetCountry("62.4.160.87"));
			// The following line mistakenly listed the country as 'ICI'
			Console.WriteLine("81.50.140.32 = {0} (FR)", table.GetCountry("81.50.140.32"));
			Console.WriteLine("81.70.12.45 = {0} (NL)", table.GetCountry("81.70.12.45"));
			Console.WriteLine("81.88.95.45 = {0} (KZ)", table.GetCountry("81.88.95.45"));
		}

		/// <summary>
		/// Looks up the country code for a host name or IP address.
		/// </summary>
		/// <param name="hostName">A <see cref="String"/> value
		/// containing the host name or IP address.</param>
		/// <remarks>If the first character of <paramref cref="hostName" />
		/// is not numerical, it is considered a domain name, and
		/// it is resolved using the .NET framework's built-in
		/// DNS lookup method.</remarks>
		static private void TestIPCountryLookup(String hostName)
		{
			IPAddress ip;

			if (hostName[0] > '9')
				ip = System.Net.Dns.Resolve(hostName).AddressList[0];
			else
				ip = IPAddress.Parse(hostName);

			String result = table.GetCountry(ip.ToString());
			Console.Write(" (");
			Console.Write(ip.ToString());
			Console.Write(") -> ");
			Console.WriteLine(result);
		}
	}
}

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About the Author

Jeffrey Sax
Founder Extreme Optimization
Canada Canada
Jeffrey has been writing numerical software for many years. He is founder and president of Extreme Optimization, a Toronto based provider of numerical component libraries for the .NET framework. He loves challenges, especially when it comes to making code run fast, and finding simplicity and elegance in what looks like complicated chaos.

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