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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;
namespace OpenSim.Framework
{
public sealed class ProxyCodec
{
public static void EncodeProxyMessage(byte[] bytes, ref int numBytes, EndPoint trueEP)
{
if (numBytes > 4090) // max UPD size = 4096
{
throw new Exception("ERROR: No space to encode the proxy EP");
}
ushort port = (ushort) ((IPEndPoint) trueEP).Port;
bytes[numBytes++] = (byte) (port % 256);
bytes[numBytes++] = (byte) (port / 256);
foreach (byte b in ((IPEndPoint) trueEP).Address.GetAddressBytes())
{
bytes[numBytes++] = b;
}
int x = numBytes;
DecodeProxyMessage(bytes, ref numBytes);
numBytes = x;
}
public static IPEndPoint DecodeProxyMessage(byte[] bytes, ref int numBytes)
{
// IPv4 Only
byte[] addr = new byte[4];
addr[3] = bytes[--numBytes];
addr[2] = bytes[--numBytes];
addr[1] = bytes[--numBytes];
addr[0] = bytes[--numBytes];
ushort port = (ushort) (bytes[--numBytes] * 256);
port += (ushort) bytes[--numBytes];
return new IPEndPoint(new IPAddress(addr), (int) port);
}
}
}
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