private void ProcessNetworkBuffer(NetworkConnection connection)
{
while (connection.NetworkBufferPosition >= 0x1C)
{
uint bufferSize = 0;
byte[] destinationArray;
lock (connection.NetworkBufferLock)
{
var indexes = new List<uint>
{
BitConverter.ToUInt32(connection.NetworkBuffer, 0),
BitConverter.ToUInt32(connection.NetworkBuffer, 4),
BitConverter.ToUInt32(connection.NetworkBuffer, 8),
BitConverter.ToUInt32(connection.NetworkBuffer, 12)
};
if ((indexes[0] != 0x41A05252) && ((indexes.Any(x => x != 0))))
{
AdjustNetworkBuffer(connection);
return;
}
bufferSize = BitConverter.ToUInt32(connection.NetworkBuffer, 0x18);
if ((bufferSize == 0) || (bufferSize > 0x10000))
{
AdjustNetworkBuffer(connection);
return;
}
if (connection.NetworkBufferPosition < bufferSize)
{
if (DateTime.Now.Subtract(connection.LastNetworkBufferUpdate)
.Seconds > 5)
{
AdjustNetworkBuffer(connection);
}
break;
}
destinationArray = new byte[bufferSize];
Array.Copy(connection.NetworkBuffer, destinationArray, bufferSize);
Array.Copy(connection.NetworkBuffer, bufferSize, connection.NetworkBuffer, 0L, connection.NetworkBufferPosition - bufferSize);
connection.NetworkBufferPosition -= (int) bufferSize;
connection.LastNetworkBufferUpdate = DateTime.Now;
}
if (bufferSize <= 40)
{
return;
}
var timeDifference = BitConverter.ToUInt64(destinationArray, 0x10);
var time = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds(timeDifference)
.ToLocalTime();
int limiter = BitConverter.ToInt16(destinationArray, 30);
int encoding = BitConverter.ToInt16(destinationArray, 0x20);
var bytes = new byte[0x10000];
int messageLength;
switch (encoding)
{
case 0:
case 1:
messageLength = ((int) bufferSize) - 40;
for (var i = 0; i < ((bufferSize / 4) - 10); i++)
{
Array.Copy(BitConverter.GetBytes(BitConverter.ToUInt32(destinationArray, (i * 4) + 40)), 0, bytes, i * 4, 4);
}
break;
default:
try
{
using (var decompressedStream = new DeflateStream(new MemoryStream(destinationArray, 0x2A, destinationArray.Length - 0x2A), CompressionMode.Decompress))
{
messageLength = decompressedStream.Read(bytes, 0, bytes.Length);
}
}
catch (Exception ex)
{
return;
}
break;
}
var position = 0;
try
{
for (var i = 0; i < limiter; i++)
{
if ((position + 4) > messageLength)
{
return;
}
var messageSize = BitConverter.ToUInt32(bytes, position);
if ((position + messageSize) > messageLength)
{
return;
}
if (messageSize > 0x18)
{
var networkPacket = new Common.Core.Network.NetworkPacket
{
Key = BitConverter.ToUInt32(bytes, position + 0x10),
Buffer = bytes,
CurrentPosition = position,
MessageSize = (int) messageSize,
PacketDate = time
};
AppContextHelper.Instance.RaiseNewPacket(networkPacket);
}
position += (int) messageSize;
}
}
catch (Exception ex)
{
return;
}
}
}
private void AdjustNetworkBuffer(NetworkConnection connection)
{
var startIndex = 1;
while ((BitConverter.ToUInt32(connection.NetworkBuffer, startIndex) != 0x41A05252) && (startIndex < connection.NetworkBufferPosition))
{
startIndex++;
}
if (startIndex >= connection.NetworkBufferPosition)
{
connection.NetworkBufferPosition = 0;
}
else
{
Array.Copy(connection.NetworkBuffer, startIndex, connection.NetworkBuffer, 0, connection.NetworkBufferPosition - startIndex);
connection.NetworkBufferPosition -= startIndex;
}
}
private void ParseData(SocketObject asyncState, byte[] byteData, int nReceived)
{
if ((byteData == null) || (byteData[9] != 6))
{
return;
}
var startIndex = (byte) ((byteData[0] & 15) * 4);
var lengthCheck = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(byteData, 2));
if ((nReceived < lengthCheck) || (startIndex > lengthCheck))
{
return;
}
var IP = new IPHeader(byteData, nReceived);
var TCP = new TCPHeader(byteData, nReceived);
var serverConnection = new ServerConnection
{
SourceAddress = (uint) BitConverter.ToInt32(byteData, 12),
DestinationAddress = (uint) BitConverter.ToInt32(byteData, 16),
SourcePort = (ushort) BitConverter.ToInt16(byteData, startIndex),
DestinationPort = (ushort) BitConverter.ToInt16(byteData, startIndex + 2),
TimeStamp = DateTime.Now
/*
// these don't return the right ports for some reason
DestinationAddress = BitConverter.ToUInt32(IP.DestinationAddress.GetAddressBytes(), 0),
DestinationPort = Convert.ToUInt16(TCP.DestinationPort),
SourcePort = Convert.ToUInt16(TCP.SourcePort),
SourceAddress = BitConverter.ToUInt32(IP.SourceAddress.GetAddressBytes(), 0),
TimeStamp = DateTime.Now
*/
};
lock (Lock)
{
var found = Enumerable.Contains(ServerConnections, serverConnection);
if (!found)
{
if (Enumerable.Contains(DroppedConnections, serverConnection))
{
return;
}
UpdateConnectionList();
if (!Enumerable.Contains(ServerConnections, serverConnection))
{
DroppedConnections.Add(serverConnection);
return;
}
}
}
if ((startIndex + 12) > nReceived)
{
return;
}
var nextTCPSequence = (uint) IPAddress.NetworkToHostOrder(BitConverter.ToInt32(byteData, startIndex + 4));
var cut = (byte) (((byteData[startIndex + 12] & 240) >> 4) * 4);
var length = (nReceived - startIndex) - cut;
if ((length < 0) || (length > 0x10000))
{
return;
}
if (lengthCheck == startIndex + cut)
{
return;
}
lock (asyncState.SocketLock)
{
var connection = asyncState.Connections.FirstOrDefault(x => x.Equals(serverConnection));
if (connection == null)
{
connection = new NetworkConnection
{
SourceAddress = serverConnection.SourceAddress,
SourcePort = serverConnection.SourcePort,
DestinationAddress = serverConnection.DestinationAddress,
DestinationPort = serverConnection.DestinationPort
};
asyncState.Connections.Add(connection);
}
if (length == 0)
{
return;
}
var destinationBuffer = new byte[length];
Array.Copy(byteData, startIndex + cut, destinationBuffer, 0, length);
if (connection.StalePackets.ContainsKey(nextTCPSequence))
{
connection.StalePackets.Remove(nextTCPSequence);
}
var packet = new NetworkPacket
{
TCPSequence = nextTCPSequence,
Buffer = destinationBuffer,
Push = (byteData[startIndex + 13] & 8) != 0
};
connection.StalePackets.Add(nextTCPSequence, packet);
if (!connection.NextTCPSequence.HasValue)
{
connection.NextTCPSequence = nextTCPSequence;
}
if (connection.StalePackets.Count == 1)
{
connection.LastGoodNetworkPacketTime = DateTime.Now;
}
if (!connection.StalePackets.Any(x => (x.Key <= connection.NextTCPSequence.Value)))
{
if (DateTime.Now.Subtract(connection.LastGoodNetworkPacketTime)
.TotalSeconds <= 10.0)
{
return;
}
connection.NextTCPSequence = connection.StalePackets.Min(x => x.Key);
}
while (connection.StalePackets.Any(x => x.Key <= connection.NextTCPSequence.Value))
{
NetworkPacket stalePacket;
uint sequenceLength = 0;
if (connection.StalePackets.ContainsKey(connection.NextTCPSequence.Value))
{
stalePacket = connection.StalePackets[connection.NextTCPSequence.Value];
}
else
{
stalePacket = (connection.StalePackets.Where(x => x.Key <= connection.NextTCPSequence.Value)
.OrderBy(x => x.Key)).FirstOrDefault()
.Value;
sequenceLength = connection.NextTCPSequence.Value - stalePacket.TCPSequence;
}
connection.StalePackets.Remove(stalePacket.TCPSequence);
if (connection.NetworkBufferPosition == 0)
{
connection.LastNetworkBufferUpdate = DateTime.Now;
}
if (sequenceLength >= stalePacket.Buffer.Length)
{
continue;
}
connection.NextTCPSequence = stalePacket.TCPSequence + ((uint) stalePacket.Buffer.Length);
Array.Copy(stalePacket.Buffer, sequenceLength, connection.NetworkBuffer, connection.NetworkBufferPosition, stalePacket.Buffer.Length - sequenceLength);
connection.NetworkBufferPosition += stalePacket.Buffer.Length - ((int) sequenceLength);
if (stalePacket.Push)
{
ProcessNetworkBuffer(connection);
}
}
}
}
