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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.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace OpenSim.ApplicationPlugins.LoadBalancer {
public class StateObject {
public Socket workSocket = null;
public const int BufferSize = 2048;
public byte[] buffer = new byte[BufferSize];
public MemoryStream ms_ptr = new MemoryStream();
public InternalPacketHeader header = null;
}
public class AsynchronousSocketListener {
public static string data = null;
public static ManualResetEvent allDone = new ManualResetEvent(false);
#region KIRYU
public delegate void PacketRecieveHandler(InternalPacketHeader header, byte[] buff);
public static PacketRecieveHandler PacketHandler = null;
#endregion
public AsynchronousSocketListener() { }
public static void StartListening(int port) {
IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, port);
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );
try {
listener.Bind(localEndPoint);
listener.Listen(100);
while (true) {
allDone.Reset();
listener.BeginAccept( new AsyncCallback(AcceptCallback), listener );
allDone.WaitOne();
}
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
/*
Console.WriteLine("\nPress ENTER to continue...");
Console.Read();
*/
}
public static void AcceptCallback(IAsyncResult ar) {
allDone.Set();
Socket listener = (Socket) ar.AsyncState;
Socket handler = listener.EndAccept(ar);
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
public static void ReadCallback(IAsyncResult ar) {
StateObject state = (StateObject) ar.AsyncState;
Socket handler = state.workSocket;
try
{
int bytesRead = handler.EndReceive(ar);
//MainLog.Instance.Verbose("TCPSERVER", "Received packet [{0}]", bytesRead);
if (bytesRead > 0) {
state.ms_ptr.Write(state.buffer, 0, bytesRead);
}
else
{
//MainLog.Instance.Verbose("TCPSERVER", "Connection terminated");
return;
}
long rest_size = state.ms_ptr.Length;
long current_pos = 0;
while (rest_size > TcpClient.internalPacketHeaderSize) {
if ((state.header == null) && (rest_size >= TcpClient.internalPacketHeaderSize))
{
//MainLog.Instance.Verbose("TCPSERVER", "Processing header");
// reading header
state.header = new InternalPacketHeader();
byte[] headerbytes = new byte[TcpClient.internalPacketHeaderSize];
state.ms_ptr.Position = current_pos;
state.ms_ptr.Read(headerbytes, 0, TcpClient.internalPacketHeaderSize);
state.ms_ptr.Seek(0, SeekOrigin.End);
state.header.FromBytes(headerbytes);
}
if ((state.header != null) && (rest_size >= state.header.numbytes + TcpClient.internalPacketHeaderSize))
{
//MainLog.Instance.Verbose("TCPSERVER", "Processing body");
// reading body
byte[] packet = new byte[state.header.numbytes];
state.ms_ptr.Position = current_pos + TcpClient.internalPacketHeaderSize;
state.ms_ptr.Read(packet, 0, state.header.numbytes);
/*
for(int i=0; i<state.header.numbytes; i++) {
System.Console.Write(packet[i] + " ");
}
System.Console.WriteLine();
*/
state.ms_ptr.Seek(0, SeekOrigin.End);
// call loadbarancer function
if (PacketHandler != null)
{
//MainLog.Instance.Verbose("TCPSERVER", "calling PacketHandler");
PacketHandler(state.header, packet);
}
else
{
//MainLog.Instance.Verbose("TCPSERVER", "PacketHandler not found");
}
int read_size = state.header.numbytes + TcpClient.internalPacketHeaderSize;
state.header = null;
rest_size -= read_size;
current_pos += read_size;
if (rest_size < TcpClient.internalPacketHeaderSize) {
byte[] rest_bytes = new byte[rest_size];
state.ms_ptr.Position = read_size;
state.ms_ptr.Read(rest_bytes, 0, (int)rest_size);
state.ms_ptr.Close();
state.ms_ptr = new MemoryStream();
state.ms_ptr.Write(rest_bytes, 0, (int)rest_size);
break;
}
}
} // while (true)
}
catch (Exception)
{
//MainLog.Instance.Verbose("TCPSERVER", e.ToString());
//MainLog.Instance.Verbose("TCPSERVER", e.StackTrace);
}
handler.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
}
public class TcpServer {
private int mPort = 11000;
public TcpServer() {
}
public TcpServer(int port) {
mPort = port;
}
public void start() {
AsynchronousSocketListener.StartListening(mPort);
}
}
}
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