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Diffstat (limited to 'OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs')
-rw-r--r--OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs107
1 files changed, 107 insertions, 0 deletions
diff --git a/OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs b/OpenSim/Framework/Servers/HttpServer/BaseStreamHandlerBasicDOSProtector.cs
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@@ -0,0 +1,107 @@
1/*
2 * Copyright (c) Contributors, http://opensimulator.org/
3 * See CONTRIBUTORS.TXT for a full list of copyright holders.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the OpenSimulator Project nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27using OpenSim.Framework;
28using System.IO;
29
30namespace OpenSim.Framework.Servers.HttpServer
31{
32 /// <summary>
33 /// BaseStreamHandlerBasicDOSProtector Base streamed request handler.
34 /// </summary>
35 /// <remarks>
36 /// Inheriting classes should override ProcessRequest() rather than Handle()
37 /// </remarks>
38 public abstract class BaseStreamHandlerBasicDOSProtector : BaseRequestHandler, IStreamedRequestHandler
39 {
40
41 private readonly BasicDosProtectorOptions _options;
42 private readonly BasicDOSProtector _dosProtector;
43
44 protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, BasicDosProtectorOptions options) : this(httpMethod, path, null, null, options) {}
45
46 protected BaseStreamHandlerBasicDOSProtector(string httpMethod, string path, string name, string description, BasicDosProtectorOptions options)
47 : base(httpMethod, path, name, description)
48 {
49 _options = options;
50 _dosProtector = new BasicDOSProtector(_options);
51 }
52
53 public virtual byte[] Handle(
54 string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
55 {
56 byte[] result;
57 RequestsReceived++;
58 string clientstring = GetClientString(httpRequest);
59 string endpoint = GetRemoteAddr(httpRequest);
60 if (_dosProtector.Process(clientstring, endpoint))
61 result = ProcessRequest(path, request, httpRequest, httpResponse);
62 else
63 result = ThrottledRequest(path, request, httpRequest, httpResponse);
64 if (_options.MaxConcurrentSessions > 0)
65 _dosProtector.ProcessEnd(clientstring, endpoint);
66
67 RequestsHandled++;
68
69 return result;
70 }
71
72 protected virtual byte[] ProcessRequest(
73 string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
74 {
75 return null;
76 }
77
78 protected virtual byte[] ThrottledRequest(
79 string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
80 {
81 return new byte[0];
82 }
83
84
85 private string GetRemoteAddr(IOSHttpRequest httpRequest)
86 {
87 string remoteaddr = string.Empty;
88 if (httpRequest.Headers["remote_addr"] != null)
89 remoteaddr = httpRequest.Headers["remote_addr"];
90
91 return remoteaddr;
92 }
93
94 private string GetClientString(IOSHttpRequest httpRequest)
95 {
96 string clientstring = string.Empty;
97
98 if (_options.AllowXForwardedFor && httpRequest.Headers["x-forwarded-for"] != null)
99 clientstring = httpRequest.Headers["x-forwarded-for"];
100 else
101 clientstring = GetRemoteAddr(httpRequest);
102
103 return clientstring;
104
105 }
106 }
107}