private static string GetMessage(PacketError code)
{
return(code switch
{
PacketError.ConversionError => "See the inner exception for details",
PacketError.Overflow => "Data length overflow",
PacketError.InvalidPath => "Path does not exist",
_ => "Undefined error",
});
private static string GetMessage(PacketError code)
{
switch (code)
{
case PacketError.ConvertError:
return("See inner exception for more information");
case PacketError.Overflow:
return("Data length overflow");
case PacketError.PathError:
return("Path not exists");
case PacketError.RecursiveError:
return("Recursion limit has been reached");
default:
return("Undefined error");
}
}
public PacketException(PacketError code) : base(GetMessage(code)) => error = code;
private void ProcessPackets(byte[] payloadData)
{
try
{
if (payloadData == null || payloadData.Length < 2)
{
return;
}
//get packetlength
byte[] tmparray = new byte[2];
tmparray[0] = payloadData[0];
tmparray[1] = payloadData[1];
ushort packetLength = BitConverter.ToUInt16(tmparray, 0);
if (payloadData.Length >= packetLength)
{
byte spacer = payloadData[2]; // skip 1 byte
byte[] packetData = new byte [payloadData.Length - 3];
//payloadData.CopyTo(packetData, 3);
Array.Copy(payloadData, 3, packetData, 0, packetLength - 3);
DecryptPacket(packetData);
byte[] packetBytes = packetData;
//Get packet id
L2RPacket packetReader = new L2RPacket(packetData);
ushort packetId = (ushort)(packetReader.ReadUInt16() - 1);
PacketFactory factory = new ConcretePacketFactory();
IL2RPacket l2rpckt = factory.GetPacket(packetId, packetReader);
/*** Fixed Queue ***/
_triggerEvent = true;
foreach (var id in _packetIdQueue)
{
if (id == packetId)
{
_triggerEvent = false;
}
}
_packetIdQueue.Enqueue(packetId);
if (_triggerEvent)
{
//FIRE L2RPacketArrivalEvent
L2RPacketArrivalEventArgs args = new L2RPacketArrivalEventArgs
{
ID = packetId,
Packet = l2rpckt,
PacketBytes = packetBytes
};
OnL2RPacketArrival(args);
//packetQue.Enqueue(l2rpckt);
}
/*** end Fixed Queue ***/
}
}
catch (Exception ex)
{
_incomingBuffer.Clear();
PacketError?.Invoke(this, new L2RPacketErrorEventArgs(ex));
}
}
/// <summary>
/// Checks for queued packets. If any exist it locks the QueueLock, saves a
/// reference of the current queue for itself, puts a new queue back into
/// place into PacketQueue and unlocks QueueLock. This is a minimal amount of
/// work done while the queue is locked.
///
/// The background thread can then process queue that it saved without holding
/// the queue lock.
/// </summary>
private void BackgroundThread()
{
while (!BackgroundThreadStop)
{
bool shouldSleep = true;
lock (QueueLock)
{
if (PacketQueue.Count != 0)
{
shouldSleep = false;
}
}
if (shouldSleep)
{
System.Threading.Thread.Sleep(250);
}
else // should process the queue
{
List <RawCapture> ourQueue;
lock (QueueLock)
{
// swap queues, giving the capture callback a new one
ourQueue = PacketQueue;
PacketQueue = new List <RawCapture>();
}
ProcessQueueTick?.Invoke(this, new L2RProcessQueueTickEventArgs(ourQueue.Count));
foreach (RawCapture packet in ourQueue)
{
// Here is where we can process our packets freely without
// holding off packet capture.
//
// NOTE: If the incoming packet rate is greater than
// the packet processing rate these queues will grow
// to enormous sizes. Packets should be dropped in these
// cases
try
{
PacketWrapper packetWrapper = new PacketWrapper(packetCount, packet);
Packet parsepacket = Packet.ParsePacket(packet.LinkLayerType, packet.Data);
TcpPacket tcpPacket = (TcpPacket)parsepacket.Extract(typeof(TcpPacket));
if (tcpPacket != null)
{
byte[] packetData = tcpPacket.PayloadData;
if (packetData != null)
{
ProcessPackets(packetData);
}
packetCount++;
}
if (statisticsUiNeedsUpdate)
{
UpdateCaptureStatistics();
statisticsUiNeedsUpdate = false;
}
}
catch (Exception ex)
{
PacketError?.Invoke(this, new L2RPacketErrorEventArgs(ex, packet));
throw;
}
}
}
}
}
void Client_DataReceived(object sender, DataReceivedEventArgs e)
{
Gtk.Application.Invoke(delegate
{
Console.WriteLine($"[<-] {e.Data}");
Packets.IPacket packet;
try
{
packet = ParserPacket.ParsePacket(e.Data);
}
catch (ParsePacketException ex)
{
Console.WriteLine(ex.ToString());
return;
}
switch (packet.Command)
{
case PacketType.Connected:
{
ChatWidget broadcastWidget = new ChatWidget(true, "Broadcast", client.SendPacket);
AddChatWidget(broadcastWidget);
// we want the list of users...
client.SendPacket(new PacketListUsers());
}
break;
case PacketType.Disconnected:
{
// handle leaving server
}
break;
case PacketType.ChatReceived:
{
PacketChatReceived chatPak = (PacketChatReceived)packet;
ShowBroadcastMessage(chatPak.FromUser, chatPak.Message);
}
break;
case PacketType.WhisperReceived:
{
PacketWhisperReceived whispPak = (PacketWhisperReceived)packet;
if (!ConnectedUsers.ContainsKey(whispPak.FromUser))
{
AddChatWidget(new ChatWidget(false, whispPak.FromUser, client.SendPacket));
}
ConnectedUsers[whispPak.FromUser].NewMessage(whispPak.FromUser, whispPak.Message);
UpdatePageLabel();
}
break;
case PacketType.WhisperSent:
{
PacketWhisperSent whispPak = (PacketWhisperSent)packet;
ConnectedUsers[whispPak.ToUser].NewMessage(Username, whispPak.Message);
UpdatePageLabel();
}
break;
case PacketType.Users:
{
PacketUsers usersPak = (PacketUsers)packet;
foreach (string user in usersPak.Users)
{
ChatWidget widget = new ChatWidget(false, user, client.SendPacket);
AddChatWidget(widget);
}
}
break;
case PacketType.UserJoined:
{
PacketUserJoined usrJnPak = (PacketUserJoined)packet;
if (!ConnectedUsers.ContainsKey(usrJnPak.Username))
{
AddChatWidget(new ChatWidget(false, usrJnPak.Username, client.SendPacket));
ShowBroadcastMessage("server", $"User '{usrJnPak.Username}' joined the server.");
}
}
break;
case PacketType.UserLeft:
{
PacketUserLeft usrLfPak = (PacketUserLeft)packet;
if (ConnectedUsers.ContainsKey(usrLfPak.Username))
{
ShowBroadcastMessage("server", $"User '{usrLfPak.Username}' left the server.");
RemoveChatWidget(ConnectedUsers[usrLfPak.Username]);
}
}
break;
case PacketType.Error:
{
PacketError errPak = (PacketError)packet;
ShowBroadcastMessage("ERROR", errPak.Message);
}
break;
case PacketType.FatalError:
{
PacketFatalError errPak = (PacketFatalError)packet;
ShowBroadcastMessage("FATAL ERROR", errPak.Message);
}
break;
}
});
}
public Protocol(string message)
{
_resultInfo = new PacketError();
_message = message;
TryParse();
}
