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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 OpenSim 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.Net;
using System.Reflection;
using log4net;
using OpenMetaverse;
using OpenSim.Framework;
namespace OpenSim.Region.Framework.Scenes.Hypergrid
{
public class HGHyperlink
{
private static readonly ILog m_log =
LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
private static Random random = new Random();
public static RegionInfo TryLinkRegionToCoords(Scene m_scene, IClientAPI client, string mapName, uint xloc, uint yloc)
{
string host = "127.0.0.1";
string portstr;
string regionName = "";
uint port = 9000;
string[] parts = mapName.Split(new char[] { ':' });
if (parts.Length >= 1)
{
host = parts[0];
}
if (parts.Length >= 2)
{
portstr = parts[1];
if (!UInt32.TryParse(portstr, out port))
regionName = parts[1];
}
// always take the last one
if (parts.Length >= 3)
{
regionName = parts[2];
}
// Sanity check. Don't ever link to this sim.
IPAddress ipaddr = null;
try
{
ipaddr = Util.GetHostFromDNS(host);
}
catch { }
if ((ipaddr != null) &&
!((m_scene.RegionInfo.ExternalEndPoint.Address.Equals(ipaddr)) && (m_scene.RegionInfo.HttpPort == port)))
{
RegionInfo regInfo;
bool success = TryCreateLink(m_scene, client, xloc, yloc, regionName, port, host, out regInfo);
if (success)
{
regInfo.RegionName = mapName;
return regInfo;
}
}
return null;
}
public static RegionInfo TryLinkRegion(Scene m_scene, IClientAPI client, string mapName)
{
uint xloc = (uint)(random.Next(0, Int16.MaxValue));
return TryLinkRegionToCoords(m_scene, client, mapName, xloc, 0);
}
public static bool TryCreateLink(Scene m_scene, IClientAPI client, uint xloc, uint yloc,
string externalRegionName, uint externalPort, string externalHostName, out RegionInfo regInfo)
{
m_log.DebugFormat("[HGrid]: Link to {0}:{1}, in {2}-{3}", externalHostName, externalPort, xloc, yloc);
regInfo = new RegionInfo();
regInfo.RegionName = externalRegionName;
regInfo.HttpPort = externalPort;
regInfo.ExternalHostName = externalHostName;
regInfo.RegionLocX = xloc;
regInfo.RegionLocY = yloc;
try
{
regInfo.InternalEndPoint = new IPEndPoint(IPAddress.Parse("0.0.0.0"), (int)0);
}
catch (Exception e)
{
m_log.Warn("[HGrid]: Wrong format for link-region: " + e.Message);
return false;
}
regInfo.RemotingAddress = regInfo.ExternalEndPoint.Address.ToString();
// Finally, link it
try
{
m_scene.CommsManager.GridService.RegisterRegion(regInfo);
}
catch (Exception e)
{
m_log.Warn("[HGrid]: Unable to link region: " + e.Message);
return false;
}
uint x, y;
if (!Check4096(m_scene, regInfo, out x, out y))
{
m_scene.CommsManager.GridService.DeregisterRegion(regInfo);
if (client != null)
client.SendAlertMessage("Region is too far (" + x + ", " + y + ")");
m_log.Info("[HGrid]: Unable to link, region is too far (" + x + ", " + y + ")");
return false;
}
if (!CheckCoords(m_scene.RegionInfo.RegionLocX, m_scene.RegionInfo.RegionLocY, x, y))
{
m_scene.CommsManager.GridService.DeregisterRegion(regInfo);
if (client != null)
client.SendAlertMessage("Region has incompatible coordinates (" + x + ", " + y + ")");
m_log.Info("[HGrid]: Unable to link, region has incompatible coordinates (" + x + ", " + y + ")");
return false;
}
m_log.Debug("[HGrid]: link region succeeded");
return true;
}
/// <summary>
/// Cope with this viewer limitation.
/// </summary>
/// <param name="regInfo"></param>
/// <returns></returns>
public static bool Check4096(Scene m_scene, RegionInfo regInfo, out uint x, out uint y)
{
ulong realHandle;
if (UInt64.TryParse(regInfo.regionSecret, out realHandle))
{
Utils.LongToUInts(realHandle, out x, out y);
x = x / Constants.RegionSize;
y = y / Constants.RegionSize;
if ((Math.Abs((int)m_scene.RegionInfo.RegionLocX - (int)x) >= 4096) ||
(Math.Abs((int)m_scene.RegionInfo.RegionLocY - (int)y) >= 4096))
{
return false;
}
return true;
}
else
{
m_scene.CommsManager.GridService.RegisterRegion(regInfo);
m_log.Debug("[HGrid]: Gnomes. Region deregistered.");
x = y = 0;
return false;
}
}
public static bool CheckCoords(uint thisx, uint thisy, uint x, uint y)
{
if ((thisx == x) && (thisy == y))
return false;
return true;
}
}
}
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