251 lines
9.2 KiB
C#
251 lines
9.2 KiB
C#
/*
|
|
* 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 System.Text;
|
|
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;
|
|
}
|
|
|
|
}
|
|
}
|