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; |
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29 | using System.Collections.Generic; |
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30 | using System.Net.Sockets; |
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31 | using System.Net; |
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32 | using System.Net.NetworkInformation; |
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33 | using System.Reflection; |
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34 | using System.Text; |
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35 | using log4net; |
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36 | |||
37 | namespace OpenSim.Framework |
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38 | { |
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39 | /// <summary> |
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40 | /// Handles NAT translation in a 'manner of speaking' |
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41 | /// Allows you to return multiple different external |
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42 | /// hostnames depending on the requestors network |
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43 | /// |
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44 | /// This enables standard port forwarding techniques |
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45 | /// to work correctly with OpenSim. |
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46 | /// </summary> |
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47 | public static class NetworkUtil |
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48 | { |
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49 | // Logger |
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50 | private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); |
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51 | |||
52 | private static bool m_disabled = true; |
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53 | |||
54 | public static bool Enabled |
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55 | { |
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56 | set { m_disabled = value; } |
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57 | get { return m_disabled; } |
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58 | } |
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59 | |||
60 | // IPv4Address, Subnet |
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61 | static readonly Dictionary<IPAddress,IPAddress> m_subnets = new Dictionary<IPAddress, IPAddress>(); |
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62 | |||
63 | public static IPAddress GetIPFor(IPAddress user, IPAddress simulator) |
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64 | { |
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65 | if (m_disabled) |
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66 | return simulator; |
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67 | |||
68 | // Check if we're accessing localhost. |
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69 | foreach (IPAddress host in Dns.GetHostAddresses(Dns.GetHostName())) |
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70 | { |
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71 | if (host.Equals(user) && host.AddressFamily == AddressFamily.InterNetwork) |
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72 | { |
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73 | m_log.Info("[NetworkUtil] Localhost user detected, sending them '" + host + "' instead of '" + simulator + "'"); |
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74 | return host; |
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75 | } |
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76 | } |
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77 | |||
78 | // Check for same LAN segment |
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79 | foreach (KeyValuePair<IPAddress, IPAddress> subnet in m_subnets) |
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80 | { |
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81 | byte[] subnetBytes = subnet.Value.GetAddressBytes(); |
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82 | byte[] localBytes = subnet.Key.GetAddressBytes(); |
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83 | byte[] destBytes = user.GetAddressBytes(); |
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84 | |||
85 | if (subnetBytes.Length != destBytes.Length || subnetBytes.Length != localBytes.Length) |
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86 | return null; |
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87 | |||
88 | bool valid = true; |
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89 | |||
90 | for (int i = 0; i < subnetBytes.Length; i++) |
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91 | { |
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92 | if ((localBytes[i] & subnetBytes[i]) != (destBytes[i] & subnetBytes[i])) |
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93 | { |
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94 | valid = false; |
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95 | break; |
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96 | } |
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97 | } |
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98 | |||
99 | if (subnet.Key.AddressFamily != AddressFamily.InterNetwork) |
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100 | valid = false; |
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101 | |||
102 | if (valid) |
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103 | { |
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104 | m_log.Info("[NetworkUtil] Local LAN user detected, sending them '" + subnet.Key + "' instead of '" + simulator + "'"); |
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105 | return subnet.Key; |
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106 | } |
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107 | } |
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108 | |||
109 | // Otherwise, return outside address |
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110 | return simulator; |
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111 | } |
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112 | |||
113 | private static IPAddress GetExternalIPFor(IPAddress destination, string defaultHostname) |
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114 | { |
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115 | // Adds IPv6 Support (Not that any of the major protocols supports it...) |
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116 | if (destination.AddressFamily == AddressFamily.InterNetworkV6) |
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117 | { |
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118 | foreach (IPAddress host in Dns.GetHostAddresses(defaultHostname)) |
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119 | { |
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120 | if (host.AddressFamily == AddressFamily.InterNetworkV6) |
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121 | { |
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122 | m_log.Info("[NetworkUtil] Localhost user detected, sending them '" + host + "' instead of '" + defaultHostname + "'"); |
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123 | return host; |
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124 | } |
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125 | } |
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126 | } |
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127 | |||
128 | if (destination.AddressFamily != AddressFamily.InterNetwork) |
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129 | return null; |
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130 | |||
131 | // Check if we're accessing localhost. |
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132 | foreach (KeyValuePair<IPAddress, IPAddress> pair in m_subnets) |
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133 | { |
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134 | IPAddress host = pair.Value; |
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135 | if (host.Equals(destination) && host.AddressFamily == AddressFamily.InterNetwork) |
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136 | { |
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137 | m_log.Info("[NATROUTING] Localhost user detected, sending them '" + host + "' instead of '" + defaultHostname + "'"); |
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138 | return destination; |
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139 | } |
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140 | } |
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141 | |||
142 | // Check for same LAN segment |
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143 | foreach (KeyValuePair<IPAddress, IPAddress> subnet in m_subnets) |
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144 | { |
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145 | byte[] subnetBytes = subnet.Value.GetAddressBytes(); |
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146 | byte[] localBytes = subnet.Key.GetAddressBytes(); |
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147 | byte[] destBytes = destination.GetAddressBytes(); |
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148 | |||
149 | if (subnetBytes.Length != destBytes.Length || subnetBytes.Length != localBytes.Length) |
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150 | return null; |
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151 | |||
152 | bool valid = true; |
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153 | |||
154 | for (int i=0;i<subnetBytes.Length;i++) |
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155 | { |
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156 | if ((localBytes[i] & subnetBytes[i]) != (destBytes[i] & subnetBytes[i])) |
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157 | { |
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158 | valid = false; |
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159 | break; |
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160 | } |
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161 | } |
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162 | |||
163 | if (subnet.Key.AddressFamily != AddressFamily.InterNetwork) |
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164 | valid = false; |
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165 | |||
166 | if (valid) |
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167 | { |
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168 | m_log.Info("[NetworkUtil] Local LAN user detected, sending them '" + subnet.Key + "' instead of '" + defaultHostname + "'"); |
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169 | return subnet.Key; |
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170 | } |
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171 | } |
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172 | |||
173 | // Check to see if we can find a IPv4 address. |
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174 | foreach (IPAddress host in Dns.GetHostAddresses(defaultHostname)) |
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175 | { |
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176 | if (host.AddressFamily == AddressFamily.InterNetwork) |
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177 | return host; |
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178 | } |
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179 | |||
180 | // Unable to find anything. |
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181 | throw new ArgumentException("[NetworkUtil] Unable to resolve defaultHostname to an IPv4 address for an IPv4 client"); |
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182 | } |
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183 | |||
184 | static NetworkUtil() |
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185 | { |
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186 | try |
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187 | { |
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188 | foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces()) |
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189 | { |
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190 | foreach (UnicastIPAddressInformation address in ni.GetIPProperties().UnicastAddresses) |
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191 | { |
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192 | if (address.Address.AddressFamily == AddressFamily.InterNetwork) |
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193 | { |
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194 | if (address.IPv4Mask != null) |
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195 | { |
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196 | m_subnets.Add(address.Address, address.IPv4Mask); |
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197 | } |
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198 | } |
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199 | } |
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200 | } |
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201 | } |
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202 | catch (NotImplementedException) |
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203 | { |
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204 | // Mono Sucks. |
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205 | } |
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206 | } |
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207 | |||
208 | public static IPAddress GetIPFor(IPEndPoint user, string defaultHostname) |
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209 | { |
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210 | if (!m_disabled) |
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211 | { |
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212 | // Try subnet matching |
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213 | IPAddress rtn = GetExternalIPFor(user.Address, defaultHostname); |
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214 | if (rtn != null) |
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215 | return rtn; |
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216 | } |
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217 | |||
218 | // Otherwise use the old algorithm |
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219 | IPAddress ia; |
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220 | |||
221 | if (IPAddress.TryParse(defaultHostname, out ia)) |
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222 | return ia; |
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223 | |||
224 | ia = null; |
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225 | |||
226 | foreach (IPAddress Adr in Dns.GetHostAddresses(defaultHostname)) |
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227 | { |
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228 | if (Adr.AddressFamily == AddressFamily.InterNetwork) |
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229 | { |
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230 | ia = Adr; |
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231 | break; |
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232 | } |
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233 | } |
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234 | |||
235 | return ia; |
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236 | } |
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237 | |||
238 | public static string GetHostFor(IPAddress user, string defaultHostname) |
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239 | { |
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240 | if (!m_disabled) |
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241 | { |
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242 | IPAddress rtn = GetExternalIPFor(user, defaultHostname); |
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243 | if (rtn != null) |
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244 | return rtn.ToString(); |
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245 | } |
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246 | return defaultHostname; |
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247 | } |
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248 | |||
249 | } |
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250 | } |