opensim – Blame information for rev 1
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1 | eva | 1 | /* |
2 | * Copyright (c) Contributors, http://opensimulator.org/ |
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3 | * See CONTRIBUTORS.TXT for a full list of copyright holders. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions are met: |
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7 | * * Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * * Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * * Neither the name of the OpenSimulator Project nor the |
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13 | * names of its contributors may be used to endorse or promote products |
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14 | * derived from this software without specific prior written permission. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY |
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17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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19 | * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY |
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20 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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23 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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25 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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26 | */ |
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27 | |||
28 | using System.Collections; |
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29 | |||
30 | namespace OpenSim.Framework.Servers.HttpServer |
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31 | { |
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32 | public class GenericHTTPDOSProtector |
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33 | { |
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34 | private readonly GenericHTTPMethod _normalMethod; |
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35 | private readonly GenericHTTPMethod _throttledMethod; |
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36 | |||
37 | private readonly BasicDosProtectorOptions _options; |
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38 | private readonly BasicDOSProtector _dosProtector; |
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39 | |||
40 | public GenericHTTPDOSProtector(GenericHTTPMethod normalMethod, GenericHTTPMethod throttledMethod, BasicDosProtectorOptions options) |
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41 | { |
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42 | _normalMethod = normalMethod; |
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43 | _throttledMethod = throttledMethod; |
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44 | |||
45 | _options = options; |
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46 | _dosProtector = new BasicDOSProtector(_options); |
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47 | } |
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48 | public Hashtable Process(Hashtable request) |
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49 | { |
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50 | Hashtable process = null; |
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51 | string clientstring= GetClientString(request); |
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52 | string endpoint = GetRemoteAddr(request); |
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53 | if (_dosProtector.Process(clientstring, endpoint)) |
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54 | process = _normalMethod(request); |
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55 | else |
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56 | process = _throttledMethod(request); |
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57 | |||
58 | if (_options.MaxConcurrentSessions>0) |
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59 | _dosProtector.ProcessEnd(clientstring, endpoint); |
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60 | |||
61 | return process; |
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62 | } |
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63 | |||
64 | private string GetRemoteAddr(Hashtable request) |
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65 | { |
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66 | string remoteaddr = ""; |
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67 | if (!request.ContainsKey("headers")) |
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68 | return remoteaddr; |
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69 | Hashtable requestinfo = (Hashtable)request["headers"]; |
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70 | if (!requestinfo.ContainsKey("remote_addr")) |
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71 | return remoteaddr; |
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72 | object remote_addrobj = requestinfo["remote_addr"]; |
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73 | if (remote_addrobj != null) |
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74 | { |
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75 | if (!string.IsNullOrEmpty(remote_addrobj.ToString())) |
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76 | { |
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77 | remoteaddr = remote_addrobj.ToString(); |
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78 | } |
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79 | |||
80 | } |
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81 | return remoteaddr; |
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82 | } |
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83 | |||
84 | private string GetClientString(Hashtable request) |
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85 | { |
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86 | string clientstring = ""; |
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87 | if (!request.ContainsKey("headers")) |
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88 | return clientstring; |
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89 | |||
90 | Hashtable requestinfo = (Hashtable)request["headers"]; |
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91 | if (_options.AllowXForwardedFor && requestinfo.ContainsKey("x-forwarded-for")) |
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92 | { |
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93 | object str = requestinfo["x-forwarded-for"]; |
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94 | if (str != null) |
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95 | { |
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96 | if (!string.IsNullOrEmpty(str.ToString())) |
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97 | { |
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98 | return str.ToString(); |
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99 | } |
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100 | } |
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101 | } |
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102 | if (!requestinfo.ContainsKey("remote_addr")) |
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103 | return clientstring; |
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104 | |||
105 | object remote_addrobj = requestinfo["remote_addr"]; |
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106 | if (remote_addrobj != null) |
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107 | { |
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108 | if (!string.IsNullOrEmpty(remote_addrobj.ToString())) |
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109 | { |
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110 | clientstring = remote_addrobj.ToString(); |
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111 | } |
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112 | } |
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113 | |||
114 | return clientstring; |
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115 | |||
116 | } |
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117 | |||
118 | } |
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119 | } |