108 lines
4.5 KiB
C#
108 lines
4.5 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using OpenSim.Framework;
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using System.IO;
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namespace OpenSim.Framework.Servers.HttpServer
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{
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/// <summary>
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/// BaseStreamHandlerBasicDOSProtector Base streamed request handler.
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/// </summary>
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/// <remarks>
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/// Inheriting classes should override ProcessRequest() rather than Handle()
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/// </remarks>
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public abstract class BaseStreamHandlerBasicDOSProtector : BaseRequestHandler, IStreamedRequestHandler
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{
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private readonly BasicDosProtectorOptions _options;
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private readonly BasicDOSProtector _dosProtector;
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protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, BasicDosProtectorOptions options) : this(httpMethod, path, null, null, options) {}
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protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, string name, string description, BasicDosProtectorOptions options)
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: base(httpMethod, path, name, description)
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{
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_options = options;
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_dosProtector = new BasicDOSProtector(_options);
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}
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public virtual byte[] Handle(
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string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
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{
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byte[] result;
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RequestsReceived++;
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string clientstring = GetClientString(httpRequest);
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string endpoint = GetRemoteAddr(httpRequest);
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if (_dosProtector.Process(clientstring, endpoint))
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result = ProcessRequest(path, request, httpRequest, httpResponse);
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else
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result = ThrottledRequest(path, request, httpRequest, httpResponse);
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if (_options.MaxConcurrentSessions > 0)
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_dosProtector.ProcessEnd(clientstring, endpoint);
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RequestsHandled++;
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return result;
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}
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protected virtual byte[] ProcessRequest(
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string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
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{
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return null;
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}
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protected virtual byte[] ThrottledRequest(
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string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
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{
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return new byte[0];
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}
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private string GetRemoteAddr(IOSHttpRequest httpRequest)
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{
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string remoteaddr = string.Empty;
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if (httpRequest.Headers["remote_addr"] != null)
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remoteaddr = httpRequest.Headers["remote_addr"];
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return remoteaddr;
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}
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private string GetClientString(IOSHttpRequest httpRequest)
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{
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string clientstring = string.Empty;
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if (_options.AllowXForwardedFor && httpRequest.Headers["x-forwarded-for"] != null)
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clientstring = httpRequest.Headers["x-forwarded-for"];
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else
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clientstring = GetRemoteAddr(httpRequest);
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return clientstring;
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}
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}
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}
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