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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Net;
  5.  
  6. public class DDoSDetector
  7. {
  8.     private Dictionary<IPAddress, List<DateTime>> requestLog;
  9.     private readonly int threshold;
  10.     private readonly TimeSpan timeWindow;
  11.  
  12.     public DDoSDetector(int requestThreshold = 100, int timeWindowSeconds = 60)
  13.     {
  14.         requestLog = new Dictionary<IPAddress, List<DateTime>>();
  15.         threshold = requestThreshold;
  16.         timeWindow = TimeSpan.FromSeconds(timeWindowSeconds);
  17.     }
  18.  
  19.     public bool IsAttackDetected(IPAddress ipAddress)
  20.     {
  21.         var now = DateTime.UtcNow;
  22.         if (!requestLog.ContainsKey(ipAddress))
  23.         {
  24.             requestLog[ipAddress] = new List<DateTime>();
  25.         }
  26.         requestLog[ipAddress].Add(now);
  27.  
  28.         // Remove requests that are older than the time window
  29.         requestLog[ipAddress] = requestLog[ipAddress]
  30.             .Where(time => now - time <= timeWindow)
  31.             .ToList();
  32.  
  33.         return requestLog[ipAddress].Count > threshold;
  34.     }
  35.  
  36.     public void CleanupOldEntries()
  37.     {
  38.         var now = DateTime.UtcNow;
  39.         var keysToRemove = new List<IPAddress>();
  40.  
  41.         foreach (var entry in requestLog)
  42.         {
  43.             if (!entry.Value.Any(time => now - time <= timeWindow))
  44.             {
  45.                 keysToRemove.Add(entry.Key);
  46.             }
  47.         }
  48.  
  49.         foreach (var key in keysToRemove)
  50.         {
  51.             requestLog.Remove(key);
  52.         }
  53.     }
  54.  
  55.     // Main method added to start the program
  56.     public static void Main(string[] args)
  57.     {
  58.         Console.WriteLine("DDoS Detector started...");
  59.  
  60.         // Create an instance of DDoSDetector
  61.         var detector = new DDoSDetector();
  62.  
  63.         // Test with a sample IP address
  64.         var ip = IPAddress.Parse("192.168.1.1");
  65.         var isAttack = detector.IsAttackDetected(ip);
  66.         Console.WriteLine($"Is DDoS Attack Detected for {ip}: {isAttack}");
  67.  
  68.         // Cleanup old entries
  69.         detector.CleanupOldEntries();
  70.     }
  71. }
  72.  
Success #stdin #stdout 0.05s 30896KB
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stdin
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Standard input is empty
stdout
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DDoS Detector started...
Is DDoS Attack Detected for 192.168.1.1: False
https://ideone.com/ya90Wr
language:
C# (NET 6.0)
created:
14 hours ago
visibility:
public

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