private void ReceiveItem()
{
CommunicationResult res;
// Receive item info
int length = 1 + 8 + 1024;
if (clientEncryptor != null)
{
length = DataEncryptor.PredictAESLength(length);
}
res = TryRead(clientIpPort, length, true);
if (!(res.Instruction == TTInstruction.Transfer_FileInfo || res.Instruction == TTInstruction.Transfer_FolderInfo))
{
throw new FailedReceivingException("Client sent unsupported item info.");
}
// Receive item
long size = BitConverter.ToInt64(res.Data, 0);
string fullName = Encoding.UTF8.GetString(res.Data, 8, 512 - 9).Replace("\0", string.Empty);
if (res.Instruction == TTInstruction.Transfer_FileInfo)
{
ReceiveFile(fullName, size);
}
else
{
ReceiveFolder(fullName);
};
}
public void TerminateConnection()
{
if (terminatingConnection || client == null)
{
return;
}
terminatingConnection = true;
// TODO Cancellation token for sending
if (client != null)
{
client.Disconnect();
client = null;
}
serverEncryptor = null;
serverDevice = null;
OnRecordableEvent("Connection terminated.", Console.ConsoleMessageType.Common);
terminatingConnection = false;
}
private void TerminateConnection(string ipPort)
{
if (ipPort == "")
{
return;
}
// TODO Cancellation token for receiving
if (server.GetClients().Contains(ipPort))
{
server.DisconnectClient(ipPort);
}
if (clientIpPort == ipPort)
{
clientIpPort = "";
clientDevice = null;
clientEncryptor = null;
OnRecordableEvent("Connection terminated.", Console.ConsoleMessageType.Common);
}
}
// Data
private async Task ReceiveData()
{
transferStopwatch = new Stopwatch();
transferStopwatch.Start();
await Task.Run(() =>
{
// Receive info about transfer
int length = 13;
if (clientEncryptor != null)
{
length = DataEncryptor.PredictAESLength(length);
}
CommunicationResult res = TryRead(clientIpPort, length, true);
// Receive data
int itemCount = 0;
if (res.Instruction == TTInstruction.Transfer_TransferInfo)
{
// Receive files individually
itemCount = BitConverter.ToInt32(res.Data, 0);
totalBytes = BitConverter.ToInt64(res.Data, 4);
for (int i = 0; i < itemCount; i++)
{
ReceiveItem();
}
}
else
{
throw new FailedReceivingException("Client sent wrong instruction about transfer.");
}
transferStopwatch.Stop();
OnRecordableEvent($"Sucessfully received {itemCount} item/s ({Explorer.ExplorerControl.FormatFileSize(bytesReceived)}) in {TTNet.FormatTimeSpan(transferStopwatch.Elapsed)} at average { Explorer.ExplorerControl.FormatFileSize(bytesReceived * 1000 / transferStopwatch.ElapsedMilliseconds)}/s.", Console.ConsoleMessageType.Common);
});
}
private async Task EstablishConnection()
{
await Task.Run(() =>
{
CommunicationResult res = null;
byte[] buffer = null;
// Deny, accept, or askpass
res = TryRead(1, maxPingMs + Settings.SettingsData.MaxPermissionAskWaitMs);
// Denied
switch (res.Instruction)
{
case TTInstruction.Connection_RefuseBusy:
throw new FailedConnectingException($"Connection to {serverDevice.Name} failed because it's busy right now.");
case TTInstruction.Connection_RefuseDeny:
throw new FailedConnectingException($"Connection to {serverDevice.Name} failed because it hasn't allowed you to send them files.");
}
// Encryption
DataEncryptor encryptor = null;
if (serverDevice.EncryptionEnabled)
{
// Check if server also has password set
if (res.Instruction != TTInstruction.Connection_AskPass)
{
TrySend(new byte[] { (byte)TTInstruction.Connection_RefusePass }, false);
throw new FailedConnectingException($"Connection to {serverDevice.Name} refused because you have set a password and it has none.");
}
// Send password
encryptor = new DataEncryptor(serverDevice.EncryptionPassword);
byte[] timePassword = TTNet.GenerateTimePasswordBytes();
buffer = new byte[1] {
(byte)TTInstruction.Connection_SendPass
}.ToList().Concat(encryptor.AESEncryptBytes(timePassword)).ToArray();
TrySend(buffer, false);
// Receive password response
res = TryRead(1);
if (res.Instruction != TTInstruction.Connection_AcceptPass)
{
throw new FailedConnectingException($"Connection to {serverDevice.Name} failed because you do not have the right password.");
}
// Receive password
try
{
res = TryRead(TTNet.TimePasswordLength + 1);
}
catch (Exception e)
{
OnRecordableEvent("Caught " + e.Message, Console.ConsoleMessageType.Error);
throw new Exception();
}
// Check password
byte[] receivedTimePassword = encryptor.AESDecryptBytes(res.Data);
if (Enumerable.SequenceEqual(timePassword, receivedTimePassword) || !TTNet.CheckTimePasswordValid(receivedTimePassword, serverDevice, maxPingMs))
{
// TODO Send RefusePass to server
throw new FailedConnectingException($"Connection to {serverDevice.Name} refused because it did not have the correct password.");
}
}
else
{
// Check if server also doesn't use password
if (res.Instruction != TTInstruction.Connection_Accept)
{
TrySend(new byte[] { (byte)TTInstruction.Connection_RefuseDeny }, false); // TODO Doesn't work, server doesn't recognize this scenario
throw new FailedConnectingException($"Connection to {serverDevice.Name} failed because it requires a password and none is set.");
}
}
// Send connection accept
TrySend(new byte[] { (byte)TTInstruction.Connection_Accept }, false);
serverEncryptor = encryptor;
OnRecordableEvent($"Established { (serverDevice.EncryptionEnabled ? "secure " : "")}connection with {serverDevice.Name}.", Console.ConsoleMessageType.Common);
});
}
private void ReceiveFile(string fullName, long size)
{
string fileName = fullName;
int idx = fullName.LastIndexOf('\\');
if (idx != -1)
{
fileName = fullName.Substring(idx + 1);
}
// Receive
long bytesToReceive = size;
bool useEncryption = clientEncryptor != null;
TransferProgressReport report = new TransferProgressReport();
report.TotalBytes = totalBytes;
report.ActiveItem = fileName;
report.CurrentBytes = 0;
report.IsSender = false;
transferProgress.Report(report);
using (FileStream fs = File.Create($"{saveLocation}\\{fullName}"))
{
ReadResult result;
int bufferSize = 0;
while (bytesToReceive > 0)
{
try
{
bufferSize = (int)Math.Min(bytesToReceive, maxBufferSize);
byte[] receivedBuffer = null;
if (useEncryption)
{
result = server.Read(clientIpPort, DataEncryptor.PredictAESLength(bufferSize));
receivedBuffer = clientEncryptor.AESDecryptBytes(result.Data);
}
else
{
result = server.Read(clientIpPort, bufferSize);
receivedBuffer = result.Data;
}
if (result.Status != ReadResultStatus.Success)
{
fs.Flush();
throw new Exception("Did not receive data in time.");
}
fs.Write(receivedBuffer, 0, bufferSize);
}
catch (Exception e)
{
fs.Flush();
throw new FailedReceivingException($"Failed while receiving '{fileName}' ({e.Message}).");
}
bytesToReceive -= bufferSize;
bytesReceived += bufferSize;
if (bytesReceived >= report.CurrentBytes + (totalBytes / 100) || bytesToReceive == 0)
{
report.CurrentBytes = bytesReceived;
transferProgress.Report(report);
}
}
fs.Flush();
}
}
private async Task EstablishConnection(string ipPort)
{
await Task.Run(() =>
{
if (ipPort == null || ipPort == "")
{
throw new FailedConnectingException("Wrong IP.");
}
string[] ipParts = ipPort.Split(':');
if (ipParts.Length != 2)
{
throw new FailedConnectingException("Wrong IP.");
}
IPAddress deviceIP;
if (!IPAddress.TryParse(ipParts[0], out deviceIP))
{
throw new FailedConnectingException("Unknown IP.");
}
Device remoteDevice = Settings.SettingsData.GetDevice(deviceIP);
if (remoteDevice == null)
{
throw new FailedConnectingException("Unknown IP.");
}
CommunicationResult res = null;
byte[] buffer = null;
// Check busy
if (IsBusy)
{
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_RefuseBusy });
throw new FailedConnectingException($"Connection from {remoteDevice.Name} refused because busy.");
}
// Check permission
if (remoteDevice.ReceiveMode == DeviceReceiveMode.Deny)
{
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_RefuseDeny });
throw new FailedConnectingException($"Connection from {remoteDevice.Name} refused because it's not allowed.");
}
if (remoteDevice.ReceiveMode == DeviceReceiveMode.AskEachTime)
{
timer = new Timer(Settings.SettingsData.MaxPermissionAskWaitMs);
timer.Elapsed += Events_TimerPermissionAskTimeout;
timer.Start();
bool allowed = false;
Application.Current.Dispatcher.Invoke(() =>
{
confirmationDialog = new Settings.ConfirmationDialog("Accept connection?", $"Do you want to accept a connection from '{remoteDevice.Name}'?", "Yes", "No");
confirmationDialog.Owner = Application.Current.MainWindow;
allowed = confirmationDialog.ShowDialog() ?? false;
});
timer.Stop();
timer.Dispose();
if (!allowed)
{
timer.Stop();
timer.Dispose();
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_RefuseDeny });
throw new FailedConnectingException($"Connection from {remoteDevice.Name} refused because you refused it.");
}
}
// Encryption
DataEncryptor encryptor = null;
if (remoteDevice.EncryptionEnabled)
{
encryptor = new DataEncryptor(remoteDevice.EncryptionPassword);
// Ask for password
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_AskPass });
// Receive password
res = TryRead(ipPort, 1 + TTNet.TimePasswordLength, false);
if (res.Instruction != TTInstruction.Connection_SendPass)
{
if (res.Instruction == TTInstruction.Connection_RefuseDeny)
{
throw new FailedConnectingException($"Connection from {remoteDevice.Name} refused refused because it did not have a password.");
}
}
// Check password
byte[] receivedTimePassword = encryptor.AESDecryptBytes(res.Data);
if (!TTNet.CheckTimePasswordValid(receivedTimePassword, remoteDevice, maxPingMs))
{
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_RefusePass });
throw new FailedConnectingException($"Connection from {remoteDevice.Name} refused because it did not have the correct password.");
}
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_AcceptPass });
// Send password
byte[] timePassword = TTNet.GenerateTimePasswordBytes();
buffer = new byte[1] {
(byte)TTInstruction.Connection_SendPass
}.ToList().Concat(encryptor.AESEncryptBytes(timePassword)).ToArray();
TrySend(ipPort, buffer);
}
else
{
// Send connection accept
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_Accept });
}
// Wait if client accepted connection
res = TryRead(ipPort, 1, false);
if (res.Instruction != TTInstruction.Connection_Accept)
{
if (res.Instruction == TTInstruction.Connection_RefusePass)
{
throw new FailedConnectingException($"Connection from {remoteDevice.Name} refused because it requires a password and none is set.");
}
}
// Check busy again
if (IsBusy)
{
TrySend(ipPort, new byte[] { (byte)TTInstruction.Connection_RefuseBusy });
throw new FailedConnectingException($"Refused connection from {remoteDevice.Name} because busy.");
}
clientDevice = remoteDevice;
clientIpPort = ipPort;
clientEncryptor = encryptor;
OnRecordableEvent($"Established { (clientDevice.EncryptionEnabled ? "secure " : "")}connection with {remoteDevice.Name}.", Console.ConsoleMessageType.Common);
});
}
