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