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#region Copyright & License Information
/*
* Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
* This file is part of OpenRA, which is free software. It is made
* available to you under the terms of the GNU General Public License
* as published by the Free Software Foundation. For more information,
* see COPYING.
*/
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Net.NetworkInformation;
using System.Threading;
namespace OpenRA.Server
{
public class Connection
{
public Socket socket;
public List<byte> data = new List<byte>();
public ReceiveState State = ReceiveState.Header;
public int ExpectLength = 8;
public int Frame = 0;
public int MostRecentFrame = 0;
public const int MaxOrderLength = 4096;
/* client data */
public int PlayerIndex;
public byte[] PopBytes(int n)
{
var result = data.GetRange(0, n);
data.RemoveRange(0, n);
return result.ToArray();
}
bool ReadDataInner(Server server)
{
var rx = new byte[1024];
var len = 0;
for (; ; )
{
try
{
// NOTE(jsd): Poll the socket first to see if there's anything there.
// This avoids the exception with SocketErrorCode == `SocketError.WouldBlock` thrown
// from `socket.Receive(rx)`.
if (!socket.Poll(0, SelectMode.SelectRead)) break;
if (0 < (len = socket.Receive(rx)))
data.AddRange(rx.Take(len));
else
{
if (len == 0)
server.DropClient(this);
break;
}
}
catch (SocketException e)
{
// NOTE(jsd): This should no longer be needed with the socket.Poll call above.
if (e.SocketErrorCode == SocketError.WouldBlock) break;
server.DropClient(this);
Log.Write("server", "Dropping client {0} because reading the data failed: {1}", PlayerIndex, e);
return false;
}
}
return true;
}
public void ReadData(Server server)
{
if (ReadDataInner(server))
while (data.Count >= ExpectLength)
{
var bytes = PopBytes(ExpectLength);
switch (State)
{
case ReceiveState.Header:
{
ExpectLength = BitConverter.ToInt32(bytes, 0) - 4;
Frame = BitConverter.ToInt32(bytes, 4);
State = ReceiveState.Data;
if (ExpectLength < 0 || ExpectLength > MaxOrderLength)
{
server.DropClient(this);
Log.Write("server", "Dropping client {0} for excessive order length = {1}", PlayerIndex, ExpectLength);
return;
}
} break;
case ReceiveState.Data:
{
server.DispatchOrders(this, Frame, bytes);
MostRecentFrame = Frame;
ExpectLength = 8;
State = ReceiveState.Header;
server.UpdateInFlightFrames(this);
} break;
}
}
}
}
public enum ReceiveState { Header, Data };
}
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