发布：2022/12/13 12:17:17作者：管理员 来源：本站 浏览次数：480
namespace YourModuleNameHere
{
public class IPBlackList : IHttpModule
{
private EventHandler onBeginRequest;
public IPBlackList()
{
onBeginRequest = new EventHandler(this.HandleBeginRequest);
}
void IHttpModule.Dispose()
{
}
void IHttpModule.Init(HttpApplication context)
{
context.BeginRequest += onBeginRequest;
}
const string BLOCKEDIPSKEY = "blockedips";
const string BLOCKEDIPSFILE = "SiteConfig/blockedips.config";
public static StringDictionary GetBlockedIPs(HttpContext context)
{
StringDictionary ips = (StringDictionary)context.Cache[BLOCKEDIPSKEY ];
if (ips == null)
{
ips = GetBlockedIPs(GetBlockedIPsFilePathFromCurrentContext(context));
context.Cache.Insert(BLOCKEDIPSKEY , ips, new CacheDependency(GetBlockedIPsFilePathFromCurrentContext(context)));
}
return ips;
}
private static string BlockedIPFileName = null;
private static object blockedIPFileNameObject = new object();
public static string GetBlockedIPsFilePathFromCurrentContext(HttpContext context)
{
if (BlockedIPFileName != null)
return BlockedIPFileName;
lock(blockedIPFileNameObject)
{
if (BlockedIPFileName == null)
{
BlockedIPFileName = context.Server.MapPath(BLOCKEDIPSFILE);
}
}
return BlockedIPFileName;
}
public static StringDictionary GetBlockedIPs(string configPath)
{
StringDictionary retval = new StringDictionary();
using (StreamReader sr = new StreamReader(configPath))
{
String line;
while ((line = sr.ReadLine()) != null)
{
line = line.Trim();
if (line.Length != 0)
{
retval.Add(line, null);
}
}
}
return retval;
}
private void HandleBeginRequest( object sender, EventArgs evargs )
{
HttpApplication app = sender as HttpApplication;
if ( app != null )
{
string IPAddr = app.Context.Request.ServerVariables["REMOTE_ADDR"];
if (IPAddr == null || IPAddr.Length == 0)
{
return;
}
StringDictionary badIPs = GetBlockedIPs(app.Context);
if (badIPs != null && badIPs.ContainsKey(IPAddr))
{
app.Context.Response.StatusCode = 404;
app.Context.Response.SuppressContent = true;
app.Context.Response.End();
return;
}
}
}
}
}
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