ProxyCodec.cs 2.8 KB

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  1. /*
  2. * Copyright (c) Contributors, http://opensimulator.org/
  3. * See CONTRIBUTORS.TXT for a full list of copyright holders.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions are met:
  7. * * Redistributions of source code must retain the above copyright
  8. * notice, this list of conditions and the following disclaimer.
  9. * * Redistributions in binary form must reproduce the above copyright
  10. * notice, this list of conditions and the following disclaimer in the
  11. * documentation and/or other materials provided with the distribution.
  12. * * Neither the name of the OpenSimulator Project nor the
  13. * names of its contributors may be used to endorse or promote products
  14. * derived from this software without specific prior written permission.
  15. *
  16. * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
  17. * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18. * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19. * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
  20. * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21. * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26. */
  27. using System;
  28. using System.Net;
  29. namespace OpenSim.Framework
  30. {
  31. public sealed class ProxyCodec
  32. {
  33. public static void EncodeProxyMessage(byte[] bytes, ref int numBytes, EndPoint trueEP)
  34. {
  35. if (numBytes > 4090) // max UPD size = 4096
  36. {
  37. throw new Exception("ERROR: No space to encode the proxy EP");
  38. }
  39. ushort port = (ushort) ((IPEndPoint) trueEP).Port;
  40. bytes[numBytes++] = (byte) (port % 256);
  41. bytes[numBytes++] = (byte) (port / 256);
  42. foreach (byte b in ((IPEndPoint) trueEP).Address.GetAddressBytes())
  43. {
  44. bytes[numBytes++] = b;
  45. }
  46. }
  47. public static IPEndPoint DecodeProxyMessage(byte[] bytes, ref int numBytes)
  48. {
  49. // IPv4 Only
  50. byte[] addr = new byte[4];
  51. addr[3] = bytes[--numBytes];
  52. addr[2] = bytes[--numBytes];
  53. addr[1] = bytes[--numBytes];
  54. addr[0] = bytes[--numBytes];
  55. ushort port = (ushort) (bytes[--numBytes] * 256);
  56. port += (ushort) bytes[--numBytes];
  57. return new IPEndPoint(new IPAddress(addr), (int) port);
  58. }
  59. }
  60. }