/// <summary>
/// Data received event handler
/// </summary>
/// <param name="iar">IAsyncResult of the data received event</param>
private void OnDataReceived(IAsyncResult iar)
{
var socketInfo = (SocketInfo)iar.AsyncState;
try
{
var received = socketInfo.Socket.EndReceive(iar);
if (received == 0)
{
OnClientDisconnected?.Invoke(this);
return;
}
socketInfo.Index += received;
if (socketInfo.Index == socketInfo.DataBuffer.Length)
{
switch (socketInfo.State)
{
case SocketInfo.StateEnum.Header:
if (socketInfo.IsNoEncryption)
{
var headerReader = new PacketReader(socketInfo.DataBuffer);
var packetHeader = headerReader.ReadShort();
socketInfo.State = SocketInfo.StateEnum.Content;
socketInfo.DataBuffer = new byte[packetHeader];
socketInfo.Index = 0;
WaitForData(socketInfo);
}
else
{
var headerReader = new PacketReader(socketInfo.DataBuffer);
var packetHeaderB = headerReader.ToArray();
var packetHeader = headerReader.ReadInt();
var packetLength = (short)MapleCrypto.GetPacketLength(packetHeader);
if (Type == SessionType.SERVER_TO_CLIENT &&
!RIV.CheckPacketToServer(BitConverter.GetBytes(packetHeader)))
{
Log.LogError("Packet check failed. Disconnecting client");
Socket.Close();
}
socketInfo.State = SocketInfo.StateEnum.Content;
socketInfo.DataBuffer = new byte[packetLength];
socketInfo.Index = 0;
WaitForData(socketInfo);
}
break;
case SocketInfo.StateEnum.Content:
var data = socketInfo.DataBuffer;
if (socketInfo.IsNoEncryption)
{
socketInfo.IsNoEncryption = false;
var reader = new PacketReader(data);
var version = reader.ReadShort();
var unknown = reader.ReadMapleString();
SIV = new MapleCrypto(reader.ReadBytes(4), version);
RIV = new MapleCrypto(reader.ReadBytes(4), version);
var serverType = reader.ReadByte();
if (Type == SessionType.CLIENT_TO_SERVER)
{
OnInitPacketReceived(version, serverType);
}
OnPacketReceived(new PacketReader(data), true);
WaitForData();
}
else
{
RIV.Crypt(data);
MapleCustomEncryption.Decrypt(data);
if (data.Length != 0)
{
OnPacketReceived?.Invoke(new PacketReader(data), false);
}
WaitForData();
}
break;
}
}
else
{
Log.LogWarning("Not enough data");
WaitForData(socketInfo);
}
}
catch (ObjectDisposedException e)
{
Log.LogError("Socket has been closed", e);
}
catch (SocketException se)
{
if (se.ErrorCode != 10054)
{
Log.LogError("Session.OnDataReceived", se);
}
}
catch (Exception e)
{
Log.LogError("Session.OnDataReceived", e);
}
}
