private void ReadFrameAsync()
{
try
{
//frame parameters
int signal;
BinaryNumber channelId = new BinaryNumber(new byte[32]);
byte[] dataLengthBuffer = new byte[2];
OffsetStream dataStream = new OffsetStream(_baseStream, 0, 0, true, false);
while (true)
{
#region read frame from base stream
//read frame signal
signal = _baseStream.ReadByte();
if (signal == -1)
{
return; //End of stream
}
//read channel id
_baseStream.ReadBytes(channelId.Value, 0, 32);
//read data length
_baseStream.ReadBytes(dataLengthBuffer, 0, 2);
dataStream.Reset(0, BitConverter.ToUInt16(dataLengthBuffer, 0), 0);
#endregion
switch ((ConnectionSignal)signal)
{
case ConnectionSignal.PingRequest:
WriteFrame(ConnectionSignal.PingResponse, channelId, null, 0, 0);
break;
case ConnectionSignal.PingResponse:
//do nothing!
break;
case ConnectionSignal.ConnectChannelMeshNetwork:
#region ConnectChannelMeshNetwork
lock (_channels)
{
if (_channels.ContainsKey(channelId))
{
WriteFrame(ConnectionSignal.DisconnectChannel, channelId, null, 0, 0);
}
else
{
ChannelStream channel = new ChannelStream(this, channelId.Clone());
_channels.Add(channel.ChannelId, channel);
ThreadPool.QueueUserWorkItem(delegate(object state)
{
try
{
//done async since the call is blocking and will block the current read thread which can cause DOS
_connectionManager.Node.MeshNetworkRequest(this, channel.ChannelId, channel);
}
catch (Exception ex)
{
Debug.Write(this.GetType().Name, ex);
channel.Dispose();
}
});
}
}
//check if tcp relay is hosted for the channel. reply back tcp relay peers list if available
Connection[] connections = _connectionManager.GetTcpRelayServerHostedNetworkConnections(channelId);
if (connections.Length > 0)
{
int count = connections.Length;
for (int i = 0; i < connections.Length; i++)
{
if (connections[i].RemotePeerEP.Equals(_remotePeerEP))
{
connections[i] = null;
count--;
break;
}
}
using (MemoryStream mS = new MemoryStream(128))
{
BinaryWriter bW = new BinaryWriter(mS);
bW.Write(Convert.ToByte(count));
foreach (Connection connection in connections)
{
if (connection != null)
{
connection.RemotePeerEP.WriteTo(bW);
}
}
byte[] data = mS.ToArray();
WriteFrame(ConnectionSignal.MeshNetworkPeers, channelId, data, 0, data.Length);
}
}
#endregion
break;
case ConnectionSignal.ChannelData:
#region ChannelData
try
{
ChannelStream channel = null;
lock (_channels)
{
channel = _channels[channelId];
}
channel.FeedReadBuffer(dataStream, _channelWriteTimeout);
}
catch
{ }
#endregion
break;
case ConnectionSignal.DisconnectChannel:
#region DisconnectChannel
try
{
ChannelStream channel;
lock (_channels)
{
channel = _channels[channelId];
_channels.Remove(channelId);
}
channel.SetDisconnected();
channel.Dispose();
}
catch
{ }
#endregion
break;
case ConnectionSignal.ConnectChannelTunnel:
#region ConnectChannelTunnel
if (IsStreamVirtualConnection(_baseStream))
{
//nesting virtual connections not allowed
WriteFrame(ConnectionSignal.DisconnectChannel, channelId, null, 0, 0);
}
else
{
ChannelStream remoteChannel1 = null;
lock (_channels)
{
if (_channels.ContainsKey(channelId))
{
WriteFrame(ConnectionSignal.DisconnectChannel, channelId, null, 0, 0);
}
else
{
//add first stream into list
remoteChannel1 = new ChannelStream(this, channelId.Clone());
_channels.Add(remoteChannel1.ChannelId, remoteChannel1);
}
}
if (remoteChannel1 != null)
{
EndPoint tunnelToRemotePeerEP = ConvertChannelIdToEp(channelId); //get remote peer ep
Connection remotePeerConnection = _connectionManager.GetExistingConnection(tunnelToRemotePeerEP); //get remote channel service
if (remotePeerConnection == null)
{
remoteChannel1.Dispose();
}
else
{
try
{
//get remote proxy connection channel stream
ChannelStream remoteChannel2 = remotePeerConnection.MakeVirtualConnection(_remotePeerEP);
//join current and remote stream
Joint joint = new Joint(remoteChannel1, remoteChannel2);
joint.Disposed += delegate(object sender, EventArgs e)
{
lock (_tunnelJointList)
{
_tunnelJointList.Remove(sender as Joint);
}
};
lock (_tunnelJointList)
{
_tunnelJointList.Add(joint);
}
joint.Start();
}
catch (Exception ex)
{
Debug.Write(this.GetType().Name, ex);
remoteChannel1.Dispose();
}
}
}
}
#endregion
break;
case ConnectionSignal.ConnectChannelVirtualConnection:
#region ConnectChannelVirtualConnection
if (IsStreamVirtualConnection(_baseStream))
{
//nesting virtual connections not allowed
WriteFrame(ConnectionSignal.DisconnectChannel, channelId, null, 0, 0);
}
else
{
lock (_channels)
{
if (_channels.ContainsKey(channelId))
{
WriteFrame(ConnectionSignal.DisconnectChannel, channelId, null, 0, 0);
}
else
{
//add proxy channel stream into list
ChannelStream channel = new ChannelStream(this, channelId.Clone());
_channels.Add(channel.ChannelId, channel);
//pass channel as connection async
ThreadPool.QueueUserWorkItem(delegate(object state)
{
try
{
_connectionManager.AcceptConnectionInitiateProtocol(channel, ConvertChannelIdToEp(channel.ChannelId));
}
catch (Exception ex)
{
Debug.Write(this.GetType().Name, ex);
channel.Dispose();
}
});
}
}
}
#endregion
break;
case ConnectionSignal.TcpRelayServerRegisterHostedNetwork:
#region TcpRelayServerRegisterHostedNetwork
_connectionManager.TcpRelayServerRegisterHostedNetwork(this, channelId.Clone());
_tcpRelayServerModeEnabled = true;
#endregion
break;
case ConnectionSignal.TcpRelayServerUnregisterHostedNetwork:
#region TcpRelayServerUnregisterHostedNetwork
_connectionManager.TcpRelayServerUnregisterHostedNetwork(this, channelId);
#endregion
break;
case ConnectionSignal.MeshNetworkPeers:
#region MeshNetworkPeers
{
BinaryReader bR = new BinaryReader(dataStream);
int count = bR.ReadByte();
List <EndPoint> peerEPs = new List <EndPoint>(count);
for (int i = 0; i < count; i++)
{
peerEPs.Add(EndPointExtension.Parse(bR));
}
_connectionManager.Node.ReceivedMeshNetworkPeersViaTcpRelay(this, channelId, peerEPs);
}
#endregion
break;
default:
throw new IOException("Invalid frame signal.");
}
//discard any unread data
if (dataStream.Length > dataStream.Position)
{
dataStream.CopyTo(Stream.Null, 1024, Convert.ToInt32(dataStream.Length - dataStream.Position));
}
}
}
catch (ThreadAbortException)
{
//stopping
}
catch (Exception ex)
{
Debug.Write(this.GetType().Name, ex);
}
finally
{
Dispose();
}
}
private void ReadFrameAsync()
{
try
{
//frame parameters
int signalType;
BinaryID channelName = new BinaryID(new byte[20]);
int dataLength;
byte[] dataBuffer = new byte[BUFFER_SIZE];
while (true)
{
#region Read frame from base stream
//read frame signal
signalType = _baseStream.ReadByte();
if (signalType == -1)
{
return; //End of stream
}
//read channel name
OffsetStream.StreamRead(_baseStream, channelName.ID, 0, 20);
//read data length
OffsetStream.StreamRead(_baseStream, dataBuffer, 0, 2);
dataLength = BitConverter.ToUInt16(dataBuffer, 0);
//read data
if (dataLength > 0)
{
OffsetStream.StreamRead(_baseStream, dataBuffer, 0, dataLength);
}
#endregion
switch ((SignalType)signalType)
{
case SignalType.NOOP:
break;
case SignalType.ConnectChannelBitChatNetwork:
#region ConnectChannelBitChatNetwork
lock (_bitChatNetworkChannels)
{
if (_bitChatNetworkChannels.ContainsKey(channelName))
{
WriteFrame(SignalType.DisconnectChannelBitChatNetwork, channelName, null, 0, 0);
}
else
{
ChannelStream channel = new ChannelStream(this, channelName.Clone(), ChannelType.BitChatNetwork);
_bitChatNetworkChannels.Add(channel.ChannelName, channel);
BitChatNetworkChannelRequest.BeginInvoke(this, channel.ChannelName, channel, null, null);
}
}
//check if tcp relay is hosted for the channel. reply back tcp relay peers list if available
try
{
List <IPEndPoint> peerEPs = TcpRelayService.GetPeerEPs(channelName, this);
if ((peerEPs != null) && (peerEPs.Count > 0))
{
using (MemoryStream mS = new MemoryStream(128))
{
mS.WriteByte(Convert.ToByte(peerEPs.Count));
foreach (IPEndPoint peerEP in peerEPs)
{
IPEndPointParser.WriteTo(peerEP, mS);
}
byte[] data = mS.ToArray();
WriteFrame(SignalType.TcpRelayResponsePeerList, channelName, data, 0, data.Length);
}
}
}
catch
{ }
#endregion
break;
case SignalType.DataChannelBitChatNetwork:
#region DataChannelBitChatNetwork
try
{
ChannelStream channel = null;
lock (_bitChatNetworkChannels)
{
channel = _bitChatNetworkChannels[channelName];
}
channel.WriteBuffer(dataBuffer, 0, dataLength, _channelWriteTimeout);
}
catch
{ }
#endregion
break;
case SignalType.DisconnectChannelBitChatNetwork:
#region DisconnectChannelBitChatNetwork
try
{
ChannelStream channel;
lock (_bitChatNetworkChannels)
{
channel = _bitChatNetworkChannels[channelName];
_bitChatNetworkChannels.Remove(channelName);
}
channel.SetDisconnected();
channel.Dispose();
}
catch
{ }
#endregion
break;
case SignalType.ConnectChannelProxyTunnel:
#region ConnectChannelProxyTunnel
{
ChannelStream remoteChannel1 = null;
lock (_proxyChannels)
{
if (_proxyChannels.ContainsKey(channelName))
{
WriteFrame(SignalType.DisconnectChannelProxy, channelName, null, 0, 0);
}
else
{
//add first stream into list
remoteChannel1 = new ChannelStream(this, channelName.Clone(), ChannelType.ProxyTunnel);
_proxyChannels.Add(remoteChannel1.ChannelName, remoteChannel1);
}
}
if (remoteChannel1 != null)
{
IPEndPoint tunnelToRemotePeerEP = ConvertChannelNameToEp(channelName); //get remote peer ep
Connection remotePeerConnection = _connectionManager.GetExistingConnection(tunnelToRemotePeerEP); //get remote channel service
if (remotePeerConnection == null)
{
remoteChannel1.Dispose();
}
else
{
try
{
//get remote proxy connection channel stream
ChannelStream remoteChannel2 = remotePeerConnection.RequestProxyConnection(_remotePeerEP);
//join current and remote stream
Joint joint = new Joint(remoteChannel1, remoteChannel2);
joint.Disposed += joint_Disposed;
lock (_proxyTunnelJointList)
{
_proxyTunnelJointList.Add(joint);
}
joint.Start();
}
catch
{
remoteChannel1.Dispose();
}
}
}
}
#endregion
break;
case SignalType.ConnectChannelProxyConnection:
#region ConnectChannelProxyConnection
lock (_proxyChannels)
{
if (_proxyChannels.ContainsKey(channelName))
{
WriteFrame(SignalType.DisconnectChannelProxy, channelName, null, 0, 0);
}
else
{
//add proxy channel stream into list
ChannelStream channel = new ChannelStream(this, channelName.Clone(), ChannelType.ProxyTunnel);
_proxyChannels.Add(channel.ChannelName, channel);
//pass channel as connection async
ThreadPool.QueueUserWorkItem(AcceptProxyConnectionAsync, channel);
}
}
#endregion
break;
case SignalType.DataChannelProxy:
#region DataChannelProxy
try
{
ChannelStream channel = null;
lock (_proxyChannels)
{
channel = _proxyChannels[channelName];
}
channel.WriteBuffer(dataBuffer, 0, dataLength, _channelWriteTimeout);
}
catch
{ }
#endregion
break;
case SignalType.DisconnectChannelProxy:
#region DisconnectChannelProxy
try
{
ChannelStream channel;
lock (_proxyChannels)
{
channel = _proxyChannels[channelName];
_proxyChannels.Remove(channelName);
}
channel.SetDisconnected();
channel.Dispose();
}
catch
{ }
#endregion
break;
case SignalType.PeerStatusQuery:
#region PeerStatusQuery
try
{
if (_connectionManager.IsPeerConnectionAvailable(ConvertChannelNameToEp(channelName)))
{
WriteFrame(SignalType.PeerStatusAvailable, channelName, null, 0, 0);
}
}
catch
{ }
#endregion
break;
case SignalType.PeerStatusAvailable:
#region PeerStatusAvailable
try
{
lock (_peerStatusLockList)
{
object lockObject = _peerStatusLockList[channelName];
lock (lockObject)
{
Monitor.Pulse(lockObject);
}
}
}
catch
{ }
#endregion
break;
case SignalType.StartTcpRelay:
#region StartTcpRelay
{
BinaryID[] networkIDs;
Uri[] trackerURIs;
using (MemoryStream mS = new MemoryStream(dataBuffer, 0, dataLength, false))
{
//read network id list
networkIDs = new BinaryID[mS.ReadByte()];
byte[] XORnetworkID = new byte[20];
for (int i = 0; i < networkIDs.Length; i++)
{
mS.Read(XORnetworkID, 0, 20);
byte[] networkID = new byte[20];
for (int j = 0; j < 20; j++)
{
networkID[j] = (byte)(channelName.ID[j] ^ XORnetworkID[j]);
}
networkIDs[i] = new BinaryID(networkID);
}
//read tracker uri list
trackerURIs = new Uri[mS.ReadByte()];
byte[] data = new byte[255];
for (int i = 0; i < trackerURIs.Length; i++)
{
int length = mS.ReadByte();
mS.Read(data, 0, length);
trackerURIs[i] = new Uri(Encoding.UTF8.GetString(data, 0, length));
}
}
lock (_tcpRelays)
{
foreach (BinaryID networkID in networkIDs)
{
if (!_tcpRelays.ContainsKey(networkID))
{
TcpRelayService relay = TcpRelayService.StartTcpRelay(networkID, this, _connectionManager.LocalPort, _connectionManager.DhtClient, trackerURIs);
_tcpRelays.Add(networkID, relay);
}
}
}
WriteFrame(SignalType.TcpRelayResponseSuccess, channelName, null, 0, 0);
}
#endregion
break;
case SignalType.StopTcpRelay:
#region StopTcpRelay
{
BinaryID[] networkIDs;
using (MemoryStream mS = new MemoryStream(dataBuffer, 0, dataLength, false))
{
//read network id list
networkIDs = new BinaryID[mS.ReadByte()];
byte[] XORnetworkID = new byte[20];
for (int i = 0; i < networkIDs.Length; i++)
{
mS.Read(XORnetworkID, 0, 20);
byte[] networkID = new byte[20];
for (int j = 0; j < 20; j++)
{
networkID[j] = (byte)(channelName.ID[j] ^ XORnetworkID[j]);
}
networkIDs[i] = new BinaryID(networkID);
}
}
lock (_tcpRelays)
{
foreach (BinaryID networkID in networkIDs)
{
if (_tcpRelays.ContainsKey(networkID))
{
_tcpRelays[networkID].StopTcpRelay(this);
_tcpRelays.Remove(networkID);
}
}
}
WriteFrame(SignalType.TcpRelayResponseSuccess, channelName, null, 0, 0);
}
#endregion
break;
case SignalType.TcpRelayResponseSuccess:
#region TcpRelayResponseSuccess
try
{
lock (_tcpRelayRequestLockList)
{
object lockObject = _tcpRelayRequestLockList[channelName];
lock (lockObject)
{
Monitor.Pulse(lockObject);
}
}
}
catch
{ }
#endregion
break;
case SignalType.TcpRelayResponsePeerList:
#region TcpRelayResponsePeerList
using (MemoryStream mS = new MemoryStream(dataBuffer, 0, dataLength, false))
{
int count = mS.ReadByte();
List <IPEndPoint> peerEPs = new List <IPEndPoint>(count);
for (int i = 0; i < count; i++)
{
peerEPs.Add(IPEndPointParser.Parse(mS));
}
TcpRelayPeersAvailable.BeginInvoke(this, channelName.Clone(), peerEPs, null, null);
}
#endregion
break;
case SignalType.DhtPacketData:
#region DhtPacketData
byte[] response = _connectionManager.DhtClient.ProcessPacket(dataBuffer, 0, dataLength, _remotePeerEP.Address);
if (response != null)
{
WriteFrame(SignalType.DhtPacketData, BinaryID.GenerateRandomID160(), response, 0, response.Length);
}
#endregion
break;
case SignalType.BitChatNetworkInvitation:
#region ChannelInvitationBitChatNetwork
if (_connectionManager.Profile.AllowInboundInvitations)
{
BitChatNetworkInvitation.BeginInvoke(channelName.Clone(), _remotePeerEP, Encoding.UTF8.GetString(dataBuffer, 0, dataLength), null, null);
}
#endregion
break;
default:
throw new IOException("Invalid frame signal type.");
}
}
}
catch
{ }
finally
{
Dispose();
}
}
