120 lines
4.6 KiB
C#
120 lines
4.6 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 System.Collections;
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namespace OpenSim.Framework.Servers.HttpServer
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{
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public class GenericHTTPDOSProtector
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{
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private readonly GenericHTTPMethod _normalMethod;
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private readonly GenericHTTPMethod _throttledMethod;
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private readonly BasicDosProtectorOptions _options;
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private readonly BasicDOSProtector _dosProtector;
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public GenericHTTPDOSProtector(GenericHTTPMethod normalMethod, GenericHTTPMethod throttledMethod, BasicDosProtectorOptions options)
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{
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_normalMethod = normalMethod;
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_throttledMethod = throttledMethod;
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_options = options;
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_dosProtector = new BasicDOSProtector(_options);
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}
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public Hashtable Process(Hashtable request)
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{
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Hashtable process = null;
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string clientstring= GetClientString(request);
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string endpoint = GetRemoteAddr(request);
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if (_dosProtector.Process(clientstring, endpoint))
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process = _normalMethod(request);
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else
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process = _throttledMethod(request);
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if (_options.MaxConcurrentSessions>0)
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_dosProtector.ProcessEnd(clientstring, endpoint);
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return process;
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}
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private string GetRemoteAddr(Hashtable request)
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{
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string remoteaddr = "";
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if (!request.ContainsKey("headers"))
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return remoteaddr;
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Hashtable requestinfo = (Hashtable)request["headers"];
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if (!requestinfo.ContainsKey("remote_addr"))
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return remoteaddr;
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object remote_addrobj = requestinfo["remote_addr"];
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if (remote_addrobj != null)
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{
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if (!string.IsNullOrEmpty(remote_addrobj.ToString()))
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{
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remoteaddr = remote_addrobj.ToString();
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}
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}
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return remoteaddr;
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}
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private string GetClientString(Hashtable request)
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{
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string clientstring = "";
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if (!request.ContainsKey("headers"))
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return clientstring;
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Hashtable requestinfo = (Hashtable)request["headers"];
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if (_options.AllowXForwardedFor && requestinfo.ContainsKey("x-forwarded-for"))
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{
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object str = requestinfo["x-forwarded-for"];
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if (str != null)
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{
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if (!string.IsNullOrEmpty(str.ToString()))
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{
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return str.ToString();
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}
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}
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}
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if (!requestinfo.ContainsKey("remote_addr"))
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return clientstring;
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object remote_addrobj = requestinfo["remote_addr"];
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if (remote_addrobj != null)
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{
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if (!string.IsNullOrEmpty(remote_addrobj.ToString()))
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{
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clientstring = remote_addrobj.ToString();
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}
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}
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return clientstring;
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}
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}
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}
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