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