From 134f86e8d5c414409631b25b8c6f0ee45fbd8631 Mon Sep 17 00:00:00 2001
From: David Walter Seikel
Date: Thu, 3 Nov 2016 21:44:39 +1000
Subject: Initial update to OpenSim 0.8.2.1 source code.
---
.../BaseStreamHandlerBasicDOSProtector.cs | 107 +++++++++++++++++++++
1 file changed, 107 insertions(+)
create mode 100644 OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs
(limited to 'OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs')
diff --git a/OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs b/OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs
new file mode 100644
index 0000000..1b88545
--- /dev/null
+++ b/OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of the OpenSimulator Project nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+using OpenSim.Framework;
+using System.IO;
+
+namespace OpenSim.Framework.Servers.HttpServer
+{
+ ///
+ /// BaseStreamHandlerBasicDOSProtector Base streamed request handler.
+ ///
+ ///
+ /// Inheriting classes should override ProcessRequest() rather than Handle()
+ ///
+ public abstract class BaseStreamHandlerBasicDOSProtector : BaseRequestHandler, IStreamedRequestHandler
+ {
+
+ private readonly BasicDosProtectorOptions _options;
+ private readonly BasicDOSProtector _dosProtector;
+
+ protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, BasicDosProtectorOptions options) : this(httpMethod, path, null, null, options) {}
+
+ protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, string name, string description, BasicDosProtectorOptions options)
+ : base(httpMethod, path, name, description)
+ {
+ _options = options;
+ _dosProtector = new BasicDOSProtector(_options);
+ }
+
+ public virtual byte[] Handle(
+ string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
+ {
+ byte[] result;
+ RequestsReceived++;
+ string clientstring = GetClientString(httpRequest);
+ string endpoint = GetRemoteAddr(httpRequest);
+ if (_dosProtector.Process(clientstring, endpoint))
+ result = ProcessRequest(path, request, httpRequest, httpResponse);
+ else
+ result = ThrottledRequest(path, request, httpRequest, httpResponse);
+ if (_options.MaxConcurrentSessions > 0)
+ _dosProtector.ProcessEnd(clientstring, endpoint);
+
+ RequestsHandled++;
+
+ return result;
+ }
+
+ protected virtual byte[] ProcessRequest(
+ string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
+ {
+ return null;
+ }
+
+ protected virtual byte[] ThrottledRequest(
+ string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
+ {
+ return new byte[0];
+ }
+
+
+ private string GetRemoteAddr(IOSHttpRequest httpRequest)
+ {
+ string remoteaddr = string.Empty;
+ if (httpRequest.Headers["remote_addr"] != null)
+ remoteaddr = httpRequest.Headers["remote_addr"];
+
+ return remoteaddr;
+ }
+
+ private string GetClientString(IOSHttpRequest httpRequest)
+ {
+ string clientstring = string.Empty;
+
+ if (_options.AllowXForwardedFor && httpRequest.Headers["x-forwarded-for"] != null)
+ clientstring = httpRequest.Headers["x-forwarded-for"];
+ else
+ clientstring = GetRemoteAddr(httpRequest);
+
+ return clientstring;
+
+ }
+ }
+}
--
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