private void PresenceHelloSend()
{
byte[] buffer;
TTNet.GeneratePresenceBuffer(MacAddress, out buffer, TTInstruction.Discovery_Hello, Settings.SettingsData.Name, DeviceType);
socketUDP.SendTo(buffer, PresenceEndPoint);
}
private void PresenceByeSend()
{
byte[] buffer;
TTNet.GeneratePresenceBuffer(MacAddress, out buffer, TTInstruction.Discovery_Bye);
socketUDP.SendTo(buffer, PresenceEndPoint);
}
private CommunicationResult TryRead(string ipPort, int count, bool doEncryption)
{
ReadResult result = server.ReadWithTimeout(maxPingMs, ipPort, count);
TTInstruction ins = TTInstruction.Empty;
byte[] buffer = null;
if (result.Status != ReadResultStatus.Success)
{
throw new FailedReceivingException($"Did not receive response ({result.Status}).");
}
if (doEncryption && clientEncryptor != null)
{
buffer = clientEncryptor.AESDecryptBytes(result.Data);
}
else
{
buffer = result.Data;
}
byte[] dat = null;
if (!TTNet.UnpackTCPBuffer(buffer, ref ins, ref dat))
{
throw new FailedReceivingException($"Received invalid response.");
}
return(new CommunicationResult(ins, dat));
}
private CommunicationResult TryRead(int count, int?overrideTimeoutMs = null)
{
int timeout = overrideTimeoutMs ?? maxPingMs;
ReadResult result = client.ReadWithTimeout(timeout, count);
if (result.Status != ReadResultStatus.Success)
{
throw new FailedReceivingException($"Did not receive response ({result.Status}).");
}
TTInstruction ins = TTInstruction.Empty;
byte[] dat = null;
if (!TTNet.UnpackTCPBuffer(result.Data, ref ins, ref dat))
{
throw new FailedReceivingException($"Received invalid response.");
}
return(new CommunicationResult(ins, dat));
}
private void Grid_Loaded(object sender, RoutedEventArgs e)
{
SetSendButtonEnabled(true);
InitializeNetworkInfo();
// TCP
transferServer = new TransferServer(IPAddress, Settings.SettingsData.NetworkTransferPort, Settings.SettingsData.MaxNetworkPingMs, Settings.SettingsData.MaxBufferSize, TransferProgress);
transferServer.OnRecordableEvent += OnRecordableEvent;
transferServer.Start();
transferClient = new TransferClient(Settings.SettingsData.NetworkTransferPort, Settings.SettingsData.MaxNetworkPingMs, Settings.SettingsData.MaxBufferSize, TransferProgress);
transferClient.OnRecordableEvent += OnRecordableEvent;
TTNet.GeneratePresenceBuffer(MacAddress, out PresenceBuffer, TTInstruction.Discovery_Present, Settings.SettingsData.Name, DeviceType);
PresenceTimer = new Timer(new TimerCallback(PresenceSend), null, 2000, Settings.SettingsData.PresenceSendPeriod);
PresenceTimeoutCheckTimer = new Timer(new TimerCallback(PresenceTimeoutTick), null, Settings.SettingsData.MaxNetworkPingMs, Settings.SettingsData.PresenceTimeoutCheckPeriod);
presenceReceiveThread = new Thread(new ThreadStart(PresenceReceiveLoop));
presenceReceiveThread.IsBackground = true;
presenceReceiveThread.Start();
PresenceHelloSend();
}
private void PresenceReceiveLoop()
{
IPEndPoint remoteIpEndPoint;
PhysicalAddressSerializable remoteMac;
TTInstruction instruction;
List <byte> data;
while (true)
{
remoteIpEndPoint = null;
remoteMac = null;
instruction = TTInstruction.Empty;
data = null;
if (TTNet.UnpackBuffer(clientUDP.Receive(ref remoteIpEndPoint), ref remoteMac, ref instruction, ref data))
{
//OnRecordableEvent($"Received presence from: {remoteIpEndPoint.Address.ToString()}", Console.ConsoleMessageType.Common);
// Skip if from self
if (remoteIpEndPoint.Address.ToString() == IPAddress.ToString())
{
continue;
}
// Add or update device in saved list
if (instruction == TTInstruction.Discovery_Hello || instruction == TTInstruction.Discovery_Present)
{
if (!Enum.IsDefined(typeof(DeviceType), (int)data[0]))
{
continue;
}
DeviceType deviceType = (DeviceType)data[0];
string deviceName = Encoding.UTF8.GetString(data.GetRange(1, data.Count - 1).ToArray());
Application.Current.Dispatcher.Invoke(() =>
{
Settings.SettingsData.AddUpdateDevice(remoteMac, deviceName, remoteIpEndPoint.Address, deviceType);
});
}
// Keep track of online status
switch (instruction)
{
case TTInstruction.Discovery_Hello:
OnlineDevices.SetOnline(remoteMac);
PresenceSend(null);
break;
case TTInstruction.Discovery_Present:
OnlineDevices.SetOnline(remoteMac);
break;
case TTInstruction.Discovery_Bye:
OnlineDevices.SetOffline(remoteMac);
break;
}
}
}
}
// General
private void InitializeNetworkInfo()
{
IPAddress internetIp;
using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 0))
{
socket.Connect("8.8.8.8", 65530);
IPEndPoint endPoint = socket.LocalEndPoint as IPEndPoint;
internetIp = endPoint.Address;
}
// Mac - this will either select the interface based on the selected mac address or the interface which will connect to internet
MacAddress = null;
PhysicalAddress backupMac = null;
IPAddress backupIp = null;
IPAddress backupMask = null;
var nics = TTNet.GetUsableNetworkInterfaces();
foreach (NetworkInterface nic in nics)
{
var interNetwork = nic.GetIPProperties().UnicastAddresses.Where(u => u.Address.AddressFamily == AddressFamily.InterNetwork);
IPAddress interfaceIp = interNetwork.Select(u => u.Address).FirstOrDefault();
IPAddress interfaceMask = interNetwork.Select(u => u.IPv4Mask).FirstOrDefault();
if (interfaceIp == null)
{
continue;
}
PhysicalAddress interfaceMac = nic.GetPhysicalAddress();
if (Settings.SettingsData.InterfaceMac != null && Settings.SettingsData.InterfaceMac.Equals(interfaceMac))
{
MacAddress = interfaceMac;
IPAddress = interfaceIp;
IPMask = interfaceMask;
break;
}
if (interfaceIp.ToString() == internetIp.ToString())
{
backupMac = interfaceMac;
backupIp = interfaceIp;
backupMask = interfaceMask;
}
}
// If interface with selected mac doesn't exist, select the one which connect to internet
if (MacAddress == null)
{
if (backupMac != null)
{
MacAddress = backupMac;
IPAddress = internetIp;
IPMask = backupMask;
Settings.SettingsData.InterfaceMac = MacAddress;
}
else
{
throw new Exception("Could not find a usable network interface.");
}
}
// Broadcast endpoint
PresenceEndPoint = new IPEndPoint(TTNet.GetBroadcastAddress(IPAddress, IPMask), Settings.SettingsData.NetworkPresencePort);
}
// Data
private async Task SendData()
{
transferStopwatch = new Stopwatch();
transferStopwatch.Start();
int totalItemCount = 0;
await Task.Run(() =>
{
// Send files info
byte[] infoBuffer = new byte[13];
infoBuffer[0] = (byte)TTInstruction.Transfer_TransferInfo;
totalItemCount = items.Count();
foreach (var item in items)
{
totalItemCount += item.GetTotalChildCount();
}
byte[] countBytes = BitConverter.GetBytes(totalItemCount);
Array.Copy(countBytes, 0, infoBuffer, 1, 4);
long totalSize = 0;
foreach (var item in items)
{
totalSize += item.GetTotalSize();
}
byte[] sizeBytes = BitConverter.GetBytes(totalSize);
Array.Copy(sizeBytes, 0, infoBuffer, 1 + 4, 8);
TrySend(infoBuffer, true);
// Send data
bytesSent = 0;
totalBytes = totalSize;
foreach (var item in items)
{
if (item.IsFolder)
{
SendFolder(item, "");
}
else
{
SendFile(item, "");
}
}
});
transferStopwatch.Stop();
OnRecordableEvent($"Sucessfully sent {totalItemCount} item/s ({ExplorerControl.FormatFileSize(bytesSent)}) in {TTNet.FormatTimeSpan(transferStopwatch.Elapsed)} at average { ExplorerControl.FormatFileSize(totalBytes * 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($"Established { (serverDevice.EncryptionEnabled ? "secure " : "")}connection with {serverDevice.Name}.", Console.ConsoleMessageType.Common);
});
}
// Data
private async Task ReceiveData()
{
transferStopwatch = new Stopwatch();
transferStopwatch.Start();
await Task.Run(() =>
{
// Receive info about transfer
int length = 13;
if (clientEncryptor != null)
{
length = DataEncryptor.PredictAESLength(length);
}
CommunicationResult res = TryRead(clientIpPort, length, true);
// Receive data
int itemCount = 0;
if (res.Instruction == TTInstruction.Transfer_TransferInfo)
{
// Receive files individually
itemCount = BitConverter.ToInt32(res.Data, 0);
totalBytes = BitConverter.ToInt64(res.Data, 4);
for (int i = 0; i < itemCount; i++)
{
ReceiveItem();
}
}
else
{
throw new FailedReceivingException("Client sent wrong instruction about transfer.");
}
transferStopwatch.Stop();
OnRecordableEvent($"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(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);
});
}
