opensim – Blame information for rev 1

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1 eva 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 */
27  
28 using System.Collections;
29  
30 namespace OpenSim.Framework.Servers.HttpServer
31 {
32 public class GenericHTTPDOSProtector
33 {
34 private readonly GenericHTTPMethod _normalMethod;
35 private readonly GenericHTTPMethod _throttledMethod;
36  
37 private readonly BasicDosProtectorOptions _options;
38 private readonly BasicDOSProtector _dosProtector;
39  
40 public GenericHTTPDOSProtector(GenericHTTPMethod normalMethod, GenericHTTPMethod throttledMethod, BasicDosProtectorOptions options)
41 {
42 _normalMethod = normalMethod;
43 _throttledMethod = throttledMethod;
44  
45 _options = options;
46 _dosProtector = new BasicDOSProtector(_options);
47 }
48 public Hashtable Process(Hashtable request)
49 {
50 Hashtable process = null;
51 string clientstring= GetClientString(request);
52 string endpoint = GetRemoteAddr(request);
53 if (_dosProtector.Process(clientstring, endpoint))
54 process = _normalMethod(request);
55 else
56 process = _throttledMethod(request);
57  
58 if (_options.MaxConcurrentSessions>0)
59 _dosProtector.ProcessEnd(clientstring, endpoint);
60  
61 return process;
62 }
63  
64 private string GetRemoteAddr(Hashtable request)
65 {
66 string remoteaddr = "";
67 if (!request.ContainsKey("headers"))
68 return remoteaddr;
69 Hashtable requestinfo = (Hashtable)request["headers"];
70 if (!requestinfo.ContainsKey("remote_addr"))
71 return remoteaddr;
72 object remote_addrobj = requestinfo["remote_addr"];
73 if (remote_addrobj != null)
74 {
75 if (!string.IsNullOrEmpty(remote_addrobj.ToString()))
76 {
77 remoteaddr = remote_addrobj.ToString();
78 }
79  
80 }
81 return remoteaddr;
82 }
83  
84 private string GetClientString(Hashtable request)
85 {
86 string clientstring = "";
87 if (!request.ContainsKey("headers"))
88 return clientstring;
89  
90 Hashtable requestinfo = (Hashtable)request["headers"];
91 if (_options.AllowXForwardedFor && requestinfo.ContainsKey("x-forwarded-for"))
92 {
93 object str = requestinfo["x-forwarded-for"];
94 if (str != null)
95 {
96 if (!string.IsNullOrEmpty(str.ToString()))
97 {
98 return str.ToString();
99 }
100 }
101 }
102 if (!requestinfo.ContainsKey("remote_addr"))
103 return clientstring;
104  
105 object remote_addrobj = requestinfo["remote_addr"];
106 if (remote_addrobj != null)
107 {
108 if (!string.IsNullOrEmpty(remote_addrobj.ToString()))
109 {
110 clientstring = remote_addrobj.ToString();
111 }
112 }
113  
114 return clientstring;
115  
116 }
117  
118 }
119 }