251 lines
9.3 KiB
C#
251 lines
9.3 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.Net.Sockets;
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using System.Net;
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using System.Net.NetworkInformation;
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using System.Reflection;
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using System.Text;
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using log4net;
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namespace OpenSim.Framework
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{
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/// <summary>
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/// Handles NAT translation in a 'manner of speaking'
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/// Allows you to return multiple different external
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/// hostnames depending on the requestors network
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///
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/// This enables standard port forwarding techniques
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/// to work correctly with OpenSim.
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/// </summary>
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public static class NetworkUtil
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{
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// Logger
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private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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private static bool m_disabled = true;
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public static bool Enabled
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{
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set { m_disabled = value; }
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get { return m_disabled; }
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}
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// IPv4Address, Subnet
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static readonly Dictionary<IPAddress,IPAddress> m_subnets = new Dictionary<IPAddress, IPAddress>();
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public static IPAddress GetIPFor(IPAddress user, IPAddress simulator)
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{
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if (m_disabled)
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return simulator;
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// Check if we're accessing localhost.
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foreach (IPAddress host in Dns.GetHostAddresses(Dns.GetHostName()))
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{
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if (host.Equals(user) && host.AddressFamily == AddressFamily.InterNetwork)
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{
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m_log.Info("[NetworkUtil] Localhost user detected, sending them '" + host + "' instead of '" + simulator + "'");
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return host;
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}
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}
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// Check for same LAN segment
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foreach (KeyValuePair<IPAddress, IPAddress> subnet in m_subnets)
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{
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byte[] subnetBytes = subnet.Value.GetAddressBytes();
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byte[] localBytes = subnet.Key.GetAddressBytes();
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byte[] destBytes = user.GetAddressBytes();
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if (subnetBytes.Length != destBytes.Length || subnetBytes.Length != localBytes.Length)
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return null;
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bool valid = true;
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for (int i = 0; i < subnetBytes.Length; i++)
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{
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if ((localBytes[i] & subnetBytes[i]) != (destBytes[i] & subnetBytes[i]))
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{
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valid = false;
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break;
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}
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}
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if (subnet.Key.AddressFamily != AddressFamily.InterNetwork)
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valid = false;
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if (valid)
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{
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m_log.Info("[NetworkUtil] Local LAN user detected, sending them '" + subnet.Key + "' instead of '" + simulator + "'");
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return subnet.Key;
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}
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}
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// Otherwise, return outside address
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return simulator;
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}
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private static IPAddress GetExternalIPFor(IPAddress destination, string defaultHostname)
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{
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// Adds IPv6 Support (Not that any of the major protocols supports it...)
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if (destination.AddressFamily == AddressFamily.InterNetworkV6)
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{
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foreach (IPAddress host in Dns.GetHostAddresses(defaultHostname))
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{
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if (host.AddressFamily == AddressFamily.InterNetworkV6)
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{
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m_log.Info("[NetworkUtil] Localhost user detected, sending them '" + host + "' instead of '" + defaultHostname + "'");
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return host;
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}
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}
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}
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if (destination.AddressFamily != AddressFamily.InterNetwork)
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return null;
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// Check if we're accessing localhost.
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foreach (KeyValuePair<IPAddress, IPAddress> pair in m_subnets)
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{
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IPAddress host = pair.Value;
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if (host.Equals(destination) && host.AddressFamily == AddressFamily.InterNetwork)
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{
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m_log.Info("[NATROUTING] Localhost user detected, sending them '" + host + "' instead of '" + defaultHostname + "'");
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return destination;
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}
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}
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// Check for same LAN segment
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foreach (KeyValuePair<IPAddress, IPAddress> subnet in m_subnets)
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{
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byte[] subnetBytes = subnet.Value.GetAddressBytes();
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byte[] localBytes = subnet.Key.GetAddressBytes();
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byte[] destBytes = destination.GetAddressBytes();
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if (subnetBytes.Length != destBytes.Length || subnetBytes.Length != localBytes.Length)
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return null;
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bool valid = true;
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for (int i=0;i<subnetBytes.Length;i++)
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{
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if ((localBytes[i] & subnetBytes[i]) != (destBytes[i] & subnetBytes[i]))
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{
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valid = false;
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break;
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}
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}
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if (subnet.Key.AddressFamily != AddressFamily.InterNetwork)
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valid = false;
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if (valid)
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{
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m_log.Info("[NetworkUtil] Local LAN user detected, sending them '" + subnet.Key + "' instead of '" + defaultHostname + "'");
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return subnet.Key;
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}
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}
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// Check to see if we can find a IPv4 address.
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foreach (IPAddress host in Dns.GetHostAddresses(defaultHostname))
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{
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if (host.AddressFamily == AddressFamily.InterNetwork)
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return host;
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}
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// Unable to find anything.
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throw new ArgumentException("[NetworkUtil] Unable to resolve defaultHostname to an IPv4 address for an IPv4 client");
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}
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static NetworkUtil()
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{
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try
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{
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foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
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{
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foreach (UnicastIPAddressInformation address in ni.GetIPProperties().UnicastAddresses)
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{
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if (address.Address.AddressFamily == AddressFamily.InterNetwork)
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{
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if (address.IPv4Mask != null)
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{
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m_subnets.Add(address.Address, address.IPv4Mask);
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}
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}
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}
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}
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}
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catch (NotImplementedException)
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{
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// Mono Sucks.
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}
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}
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public static IPAddress GetIPFor(IPEndPoint user, string defaultHostname)
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{
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if (!m_disabled)
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{
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// Try subnet matching
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IPAddress rtn = GetExternalIPFor(user.Address, defaultHostname);
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if (rtn != null)
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return rtn;
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}
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// Otherwise use the old algorithm
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IPAddress ia;
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if (IPAddress.TryParse(defaultHostname, out ia))
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return ia;
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ia = null;
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foreach (IPAddress Adr in Dns.GetHostAddresses(defaultHostname))
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{
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if (Adr.AddressFamily == AddressFamily.InterNetwork)
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{
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ia = Adr;
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break;
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}
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}
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return ia;
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}
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public static string GetHostFor(IPAddress user, string defaultHostname)
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{
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if (!m_disabled)
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{
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IPAddress rtn = GetExternalIPFor(user, defaultHostname);
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if (rtn != null)
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return rtn.ToString();
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}
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return defaultHostname;
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}
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}
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}
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