XmlRpcBasicDOSProtector.cs

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using System.Net;
using Nwc.XmlRpc;
using OpenSim.Framework;


namespace OpenSim.Framework.Servers.HttpServer
{
    public class XmlRpcBasicDOSProtector
    {
        private readonly XmlRpcMethod _normalMethod;
        private readonly XmlRpcMethod _throttledMethod;
       
        private readonly BasicDosProtectorOptions _options;
        private readonly BasicDOSProtector _dosProtector;

        public XmlRpcBasicDOSProtector(XmlRpcMethod normalMethod, XmlRpcMethod throttledMethod,BasicDosProtectorOptions options)
        {
            _normalMethod = normalMethod;
            _throttledMethod = throttledMethod;
           
            _options = options;
            _dosProtector = new BasicDOSProtector(_options);

        }
        public XmlRpcResponse Process(XmlRpcRequest request, IPEndPoint client)
        {

            XmlRpcResponse resp = null;
            string clientstring = GetClientString(request, client);
            string endpoint = GetEndPoint(request, client);
            if (_dosProtector.Process(clientstring, endpoint))
                resp = _normalMethod(request, client);
            else
                resp = _throttledMethod(request, client);
            if (_options.MaxConcurrentSessions > 0)
                _dosProtector.ProcessEnd(clientstring, endpoint);
            return resp;
        }

        private string GetClientString(XmlRpcRequest request, IPEndPoint client)
        {
            string clientstring;
            if (_options.AllowXForwardedFor && request.Params.Count > 3)
            {
                object headerstr = request.Params[3];
                if (headerstr != null && !string.IsNullOrEmpty(headerstr.ToString()))
                    clientstring = request.Params[3].ToString();
                else
                    clientstring = client.Address.ToString();
            }
            else
                clientstring = client.Address.ToString();
            return clientstring;
        }

        private string GetEndPoint(XmlRpcRequest request, IPEndPoint client)
        {
             return client.Address.ToString();
        }

    }

    
}