122 lines
3.0 KiB
C#
122 lines
3.0 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2017 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net.Sockets;
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namespace OpenRA.Server
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{
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public class Connection
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{
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public const int MaxOrderLength = 131072;
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public Socket Socket;
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public List<byte> Data = new List<byte>();
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public ReceiveState State = ReceiveState.Header;
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public int ExpectLength = 8;
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public int Frame = 0;
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public int MostRecentFrame = 0;
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public bool Validated;
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public long TimeSinceLastResponse { get { return Game.RunTime - lastReceivedTime; } }
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public bool TimeoutMessageShown = false;
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long lastReceivedTime = 0;
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/* client data */
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public int PlayerIndex;
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public byte[] PopBytes(int n)
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{
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var result = Data.GetRange(0, n);
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Data.RemoveRange(0, n);
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return result.ToArray();
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}
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bool ReadDataInner(Server server)
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{
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var rx = new byte[1024];
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var len = 0;
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for (;;)
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{
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try
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{
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// Poll the socket first to see if there's anything there.
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// This avoids the exception with SocketErrorCode == `SocketError.WouldBlock` thrown
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// from `socket.Receive(rx)`.
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if (!Socket.Poll(0, SelectMode.SelectRead)) break;
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if (0 < (len = Socket.Receive(rx)))
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Data.AddRange(rx.Take(len));
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else
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{
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if (len == 0)
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server.DropClient(this);
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break;
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}
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}
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catch (SocketException e)
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{
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// This should no longer be needed with the socket.Poll call above.
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if (e.SocketErrorCode == SocketError.WouldBlock) break;
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server.DropClient(this);
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Log.Write("server", "Dropping client {0} because reading the data failed: {1}", PlayerIndex, e);
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return false;
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}
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}
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lastReceivedTime = Game.RunTime;
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TimeoutMessageShown = false;
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return true;
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}
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public void ReadData(Server server)
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{
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if (ReadDataInner(server))
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while (Data.Count >= ExpectLength)
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{
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var bytes = PopBytes(ExpectLength);
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switch (State)
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{
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case ReceiveState.Header:
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{
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ExpectLength = BitConverter.ToInt32(bytes, 0) - 4;
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Frame = BitConverter.ToInt32(bytes, 4);
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State = ReceiveState.Data;
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if (ExpectLength < 0 || ExpectLength > MaxOrderLength)
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{
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server.DropClient(this);
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Log.Write("server", "Dropping client {0} for excessive order length = {1}", PlayerIndex, ExpectLength);
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return;
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}
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} break;
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case ReceiveState.Data:
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{
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if (MostRecentFrame < Frame)
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MostRecentFrame = Frame;
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server.DispatchOrders(this, Frame, bytes);
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ExpectLength = 8;
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State = ReceiveState.Header;
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} break;
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}
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}
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}
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}
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public enum ReceiveState { Header, Data }
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}
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