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Web.config

<httpModules>
<!–Url重寫–>
<add type=”UrlRewriter.RewriterHttpModule, UrlRewriter” name=”UrlRewriter”/>
<!–防類似DDOS攻擊–>
<add type=”UrlRewriter.DDosAttackModule, UrlRewriter” name=”DDosAttackModule”/>
</httpModules>

using System; using System.Web; using System.Collections.Generic; using System.Collections.Specialized; using System.Timers;namespace UrlRewriter {/// <summary>/// 阻止攻擊IP地址的回應/// </summary>public class DosAttackModule : IHttpModule{void IHttpModule.Dispose() { }void IHttpModule.Init(HttpApplication context){context.BeginRequest += new EventHandler(context_BeginRequest);}private static Dictionary<string, short> _IpAdresses = new Dictionary<string, short>();private static Stack<string> _Banned = new Stack<string>();private static Timer _Timer = CreateTimer();private static Timer _BannedTimer = CreateBanningTimer();private const int BANNED_REQUESTS = 1; //規定時間內訪問的最大次數private const int REDUCTION_INTERVAL = 1000; // 1 秒（檢查訪問次數的時間段）private const int RELEASE_INTERVAL = 5 * 60 * 1000; // 5 分鐘（清除一個禁止IP的時間段）private void context_BeginRequest(object sender, EventArgs e){string ip = HttpContext.Current.Request.UserHostAddress;if (_Banned.Contains(ip)){HttpContext.Current.Response.StatusCode = 403;HttpContext.Current.Response.End();}CheckIpAddress(ip);}/// <summary>/// 檢查訪問IP/// </summary>private static void CheckIpAddress(string ip){if (!_IpAdresses.ContainsKey(ip)) //如果沒有當前訪問IP的記錄就將訪問次數設為1{_IpAdresses[ip] = 1;}else if (_IpAdresses[ip] == BANNED_REQUESTS) //如果當前IP訪問次數等于規定時間段的最大訪問次數就拉于“黑名單”{_Banned.Push(ip);_IpAdresses.Remove(ip);}else //正常訪問就加次數 1{_IpAdresses[ip]++;}}#region Timers/// <summary>/// 創建計時器，從_IpAddress減去一個請求。/// </summary>private static Timer CreateTimer(){Timer timer = GetTimer(REDUCTION_INTERVAL);timer.Elapsed += new ElapsedEventHandler(TimerElapsed);return timer;}/// <summary>/// 創建定時器，消除一個禁止的IP地址/// </summary>/// <returns></returns>private static Timer CreateBanningTimer(){Timer timer = GetTimer(RELEASE_INTERVAL);timer.Elapsed += delegate { _Banned.Pop(); }; //消除一個禁止IPreturn timer;}/// <summary>/// 創建一個時間器，并啟動它/// </summary>/// <param name="interval">以毫秒為單位的時間間隔</param>private static Timer GetTimer(int interval){Timer timer = new Timer();timer.Interval = interval;timer.Start();return timer;}/// <summary>/// 減去從集合中的每個IP地址的請求/// </summary>private static void TimerElapsed(object sender, ElapsedEventArgs e){foreach (string key in _IpAdresses.Keys){_IpAdresses[key]--;if (_IpAdresses[key] == 0)_IpAdresses.Remove(key);}}#endregion} }

http://blog.wuaiwei.com/2011/04/02/asp-neté2?±????ddos??????￡??/#more-118

轉載于:https://www.cnblogs.com/jamin/archive/2011/04/11/2012254.html

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