/*
* Event handler for clicks on the "Disconnect" in the contextMenuStrip
*/
private void disconnectServerToolStripMenuItem_Click(object sender, EventArgs e)
{
TcpClient toRemove = this.remoteHosts[ServerList.SelectedItem.ToString()]; /* The client to remove is the client current selected */
if (this.targetServer != null && this.targetServer.Equals(toRemove)) /*If we are removing the actual target server we have to assign null to tcpcl in order to avoid*/
{
this.targetServer = null; /*transfers toward a disconnected server.*/
}
try
{
if (toRemove != null && toRemove.Connected) /* Standards checks */
{
message msg = new message();
msg.messType = messageType.DISCONNECT; /* Message Type: Disconnect! */
byte[] buffer = SocketCommunication.rawSerialize(msg);
SocketCommunication.sendBufferToSocket(buffer, toRemove);
}
toRemove.Close(); /*Here we are closing the socket connected with the server to remove from ServerList*/
this.remoteHosts.Remove(ServerList.SelectedItem.ToString()); /* We have to remove the server from tme remoteHosts dictionary */
this.ServerList.Items.Remove(ServerList.SelectedItem.ToString()); /* And from the extern list! */
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
/*
* Button to close the application
*/
private void X_Click(object sender, EventArgs e)
{
/*
* First thing: sending a DISCONNECT message to all connected servers.
*/
if (remoteHosts != null)
{
foreach (TcpClient tc in this.remoteHosts.Values)
{
if (tc.Connected) /*If tc is still an active server*/
{
message msg = new message();
msg.messType = messageType.DISCONNECT;
byte[] buffer = SocketCommunication.rawSerialize(msg);
SocketCommunication.sendBufferToSocket(buffer, tc);
tc.Close(); /* Socket close! */
}
}
}
/*
* Here we close the application.
*/
Application.Exit();
}
/*
* Listener for mouse wheel in the "MouseArea box". Here we capture each mouse wheel in MouseArea box and we will send this event (mouse wheel)
* toward the server actually connected.
*/
private void MouseArea_MouseWheel(object sender, MouseEventArgs e)
{
message msg = new message();
try
{
if (targetServer != null && targetServer.Connected) /* If no server is actually connected, we have to sent nothing */
{
msg.act.eventype = EVENTYPE.MOUSE_WHEEL; /* Event type: Mouse Wheel! */
msg.act.wheelMovement = e.Delta; /* e.Delta contains the number of wheel rotations. */
msg.messType = messageType.ACTION; /* Type of message: mouse or keyboard action, that must be sent via SendInput by the Server. */
/*
* Here we send all data to the server via Socket.
*/
byte[] buffer = SocketCommunication.rawSerialize(msg); /*Raw Serialize: Struct Serialization*/
SocketCommunication.sendBufferToSocket(buffer, targetServer); /*Buffer sending*/
}
}
catch (Exception ex) /*If some exception occurs, we will show a message with the Error Description*/
{
MessageBox.Show(ex.Message);
}
}
/*
* Listener for mouse movements in the "MouseArea box". Here we capture each mouse movement and we send this event (mouse coordinates update)
* toward the server actually connected.
*/
private void MouseArea_MouseMove(object sender, MouseEventArgs e)
{
message msg = new message(); /* Message struct to send to the Server */
try
{
if (targetServer != null && targetServer.Connected) /* If no server is actually connected, we have to sent nothing */
{
msg.act.eventype = EVENTYPE.MOUSE_MOVEMENT; /* Type of event: mouse movement */
/*
* Mouse coordinates in the MouseArea box, that maps the server screen. The mouse coordinates ti send with SendInput are mapped
* in the value range 0 - 65536.
*/
msg.act.x = (Cursor.Position.X - MouseArea.Location.X) * 65536 / MouseArea.Width;
msg.act.y = (Cursor.Position.Y - MouseArea.Location.Y) * 65536 / MouseArea.Height;
msg.messType = messageType.ACTION; /* Type of message: mouse or keyboard action, that must be sent via SendInput by the Server. */
/*
* Here we send all data to the server via Socket.
*/
byte[] buffer = SocketCommunication.rawSerialize(msg); /*Raw Serialize: Struct Serialization*/
SocketCommunication.sendBufferToSocket(buffer, targetServer); /*Buffer sending*/
}
}
catch (Exception ex) /*If some exception occurs, we will show a message with the Error Description*/
{
MessageBox.Show(ex.Message);
}
}
/*
* Performing a double click in a server in the Server List, we will select this server as Target, and we will update
* the server clipboard with the clipboard data actually present in the client.
*/
private void ServerList_MouseDoubleClick(object sender, MouseEventArgs e)
{
message msg = new message();
if (ServerList.SelectedItem == null)
{
return; /* If we perform a double click where there is no item, return here. */
}
TcpClient cl = remoteHosts[ServerList.SelectedItem.ToString()]; /*The new Server is the current selected server.*/
byte[] buffer;
try
{
if (this.targetServer == null || !this.targetServer.Equals(cl)) /* If we are selecting the same target server, we do not have to send TARGET_CHANGED and TARGET messages */
{
if (this.targetServer != null && this.targetServer.Connected) /*Here we are informing the old server that it is not longer the client target*/
{
msg.messType = messageType.TARGET_CHANGED; /* Type of message: Target_Changed! */
buffer = SocketCommunication.rawSerialize(msg);
SocketCommunication.sendBufferToSocket(buffer, targetServer);
}
/*
* Here we change the Server and we will inform the new server that it is the new client target!
*/
this.targetServer = cl; /*The new tcpcl is the selected Server cl*/
msg.messType = messageType.TARGET; /* Type of message: Target! */
buffer = SocketCommunication.rawSerialize(msg);
SocketCommunication.sendBufferToSocket(buffer, targetServer);
}
/*
* Performing this operation we will unblock the sender thread, that Will analyze the clipboard and will send clipboard
* data toward the new Server. Note that if we perform a double click on the current target server, this operation will be anyway performed.
*/
send.Set();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
/*
* The system calls this function every time a new keyboard input event is about to be posted into this thread input queue.
* In fact, this function is the keyboard listener, that send keyboards Events toward the current targete server.
*/
public int LowLevelKeyboardProc(int code, int wParam, ref keyboardHookStruct lParam)
{
message msg = new message();
byte[] buffer;
try
{
/* A code the hook procedure uses to determine how to process the message. If nCode is less than zero,
* the hook procedure must pass the message to the CallNextHookEx function without further processing and
* should return the value returned by CallNextHookEx. Obviously, to send the message tcpcl has to be connected and not null :)
*/
if (code >= 0 && targetServer != null && targetServer.Connected)
{
if ((wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN)) /* keydown case. We send toward the server both normal keys and system keys. */
{
msg.act.eventype = EVENTYPE.KEY_DOWN;
}
else if ((wParam == WM_KEYUP || wParam == WM_SYSKEYUP)) /* Keyup case. */
{
msg.act.eventype = EVENTYPE.KEY_UP;
}
msg.act.keypress = lParam.vkCode; /* vkCode of the kay that has been pressed. */
msg.messType = messageType.ACTION;
buffer = SocketCommunication.rawSerialize(msg);
SocketCommunication.sendBufferToSocket(buffer, targetServer);
return(1);
}
else
{
/*
* We do not perform any operation and we call the next function in the HookProcChain.
*/
return(CallNextHookEx(hhook, code, wParam, ref lParam));
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return(CallNextHookEx(hhook, code, wParam, ref lParam)); /*If an exception*/
}
}
/*
* Listener for "mouse ups" in the "MouseArea box". Here we capture each mouse up event in MouseArea box
* and we will send this event (mouse left/right up) toward the server actually connected.
*/
private void MouseArea_MouseUp(object sender, MouseEventArgs e)
{
message msg = new message();
try
{
if (targetServer != null && targetServer.Connected) /* If no server is actually connected, we have to sent nothing */
{
/*
* Here we have to Identify which mouse button has been released. MouseEventArgs contains this kind of information.
*/
if (e.Button == MouseButtons.Left)
{
msg.act.eventype = EVENTYPE.LEFT_UP;
}
else if (e.Button == MouseButtons.Right)
{
msg.act.eventype = EVENTYPE.RIGHT_UP;
}
else if (e.Button == MouseButtons.Middle)
{
msg.act.eventype = EVENTYPE.MIDDLE_UP;
}
msg.messType = messageType.ACTION; /* Type of message: mouse or keyboard action, that must be sent via SendInput by the Server. */
/*
* Here we send all data to the server via Socket.
*/
byte[] buffer = SocketCommunication.rawSerialize(msg); /*Raw Serialize: Struct Serialization*/
SocketCommunication.sendBufferToSocket(buffer, targetServer); /*Buffer sending*/
}
}
catch (Exception ex) /*If some exception occurs, we will show a message with the Error Description*/
{
MessageBox.Show(ex.Message.ToString());
}
}
/*
* Function of clipSender thread. This thread will stay blocked waiting for a condition variable set, performed by the main thread
* when the user perform a copy/cut operation.
*/
private void clipSenderFunction()
{
message msg = new message();
byte[] data = null;
while (enableClipSender) /*This function runs until the Application is active or the user makes a click on StopServerButton.*/
{
try
{
send.WaitOne(); /* Wait for a notification from the main thread */
if (!enableClipSender) /* If the main thread has set this boolean to false, this thread will terminate here. */
{
break;
}
IPEndPoint remoteIpEndPoint = clientSocket.Client.RemoteEndPoint as IPEndPoint; /* IP address of the client actually connected */
msg.messType = messageType.REMOTE_COPY; /* The operation to perform is a RemoteCopy! */
if (Clipboard.ContainsText()) /* The clipboard contains text! */
{
String text = Clipboard.GetText(); /* Here we get the text copied in the clipboard */
data = Encoding.Unicode.GetBytes(text); /* We have to get the byte array of the text, in order to send this through a socket. */
msg.cinf.ct = clipboardType.TEXT; /* We are sending text! */
}
else if (Clipboard.ContainsImage()) /*The clipboard contains an Image!*/
{
Image img = Clipboard.GetImage(); /*We have to get the image object..*/
data = SocketCommunication.serialize(img); /* and to serialize it! */
msg.cinf.ct = clipboardType.IMAGE; /*The data is an Image*/
}
else if (Clipboard.ContainsAudio()) /* The clipboard contains an audio stream! */
{
Stream audio = Clipboard.GetAudioStream(); /*We have to get the stream object..*/
data = SocketCommunication.serialize(audio); /* and to serialize it! */
msg.cinf.ct = clipboardType.AUDIO; /* The clipboard data is an audio stream! */
}
else if (Clipboard.ContainsFileDropList()) /* The clipboard contains files! */
{
string archPath = SocketCommunication.createArchive(); /*This function creates an archive with all files in the clipboard*/
FileInfo fi = new FileInfo(archPath); /* Object containing info about the archive */
if (fi.Length > 10 * 1024 * 1024) /* If the zip size is more than 10 MB */
{
DialogResult confirmResult = MessageBox.Show("Sei davvero sicuro di voler trasferire più di 10 MB di dati?",
"Conferma Trasferimento",
MessageBoxButtons.YesNo); /* We have to show a confirm button, in order to avoid network overhead. */
if (confirmResult == DialogResult.No) /* If the user doesn't want to transfer the file.. */
{
continue; /* We have to continue */
}
}
msg.cinf.ct = clipboardType.FILES; /* The clipboard data is a FileDropList! */
msg.cinf.size = (int)fi.Length; /* Size of the archive that is going to be sent */
using (clipClient = new TcpClient()) /* Socket used to send clipboard data to server */
{
clipClient.Connect(remoteIpEndPoint.Address, 9999); /* We have to connect to the target server, port 9999 */
SocketCommunication.sendBufferToSocket(SocketCommunication.rawSerialize(msg), clipClient);
SocketCommunication.sendFileToSocket(clipClient, archPath);
}
File.Delete(archPath);
continue;
}
else
{
msg.cinf.ct = clipboardType.NO_VALID_DATA;
data = new byte[4];
}
if (data.Length > 10 * 1024 * 1024) /* If the data size is more than 10 MB */
{
DialogResult confirmResult = MessageBox.Show("Sei davvero sicuro di voler trasferire più di 10 MB di dati?",
"Conferma Trasferimento",
MessageBoxButtons.YesNo); /* We have to show a confirm button, in order to avoid network overhead. */
if (confirmResult == DialogResult.No) /* If the user doesn't want to transfer the file.. */
{
continue; /* We have to continue */
}
}
msg.cinf.size = data.Length;
using (clipClient = new TcpClient())
{
clipClient.Connect(remoteIpEndPoint.Address, 9999);
SocketCommunication.sendBufferToSocket(SocketCommunication.rawSerialize(msg), clipClient); /*Struct Sending*/
SocketCommunication.sendChunks(clipClient, data); /* Data sending */
}
}
catch (SocketException) /* The exceptions that occurs will be catched here and the thread will not terminate! This thread has to remain active while the application ends */
{
continue;
}
catch (IOException)
{
continue;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
/*
* Server function. While main thread is waiting for user commands,
* this thread is listening for client connection/commands and eventually will inject events in system queue.
*/
private void listener_function()
{
message msg = new message();
byte[] data; /*Byte array containing received data*/
bool breaker; /*Boolean variable to break out of the inner loop*/
serverSocket.Start(); /*Initialization of server Socket*/
MessageBox.Show("Server Is Listening!");
while (connected)
{
try /* This try/catch block is in the while loop in order to avoid the listener thread termination due to some exception */
{
clientSocket = serverSocket.AcceptTcpClient(); /*The server is waiting for a client connection*/
data = SocketCommunication.receiveBufferFromSocket(clientSocket); /* First thing, the client sends to the server the password */
string psw = Encoding.Unicode.GetString(data); /* Get the password string from the byte array received */
if (psw.CompareTo(password) == 0) /* If the password is correct */
{
msg.messType = messageType.CONNECTION_ACCEPTED; /* The server reply with a "ConnectionAccepted message" */
}
else /* If the password is wrong */
{
msg.messType = messageType.CONNECTION_REFUSED;/* The server reply with a "Connection Refused Message" */
}
SocketCommunication.sendBufferToSocket(SocketCommunication.rawSerialize(msg), clientSocket);
if (msg.messType == messageType.CONNECTION_REFUSED) /* If the password was wrong, we must not accept client messages. */
{
throw new Exception("Wrong Password"); /* Then we have to listen for a new connection, showing to the user the message "Wrong Password" */
}
/*
* Here we are showing to the user info about the client actually connected
*/
Invoke(new editLabel(this.editLabel), new object[] { statusInfo, "CONNECTED WITH " + clientSocket.Client.RemoteEndPoint.ToString() });
this.target = true;
breaker = true; /* While the client is still active, we have to receive client messages. Breaker = false only if the client send to the server a "Disconnect" message */
while (breaker)
{
data = SocketCommunication.receiveBufferFromSocket(clientSocket); /* Wait for a client message */
msg = SocketCommunication.rawDeserialize <message>(data); /* Deserialization of the received byte array */
switch (msg.messType) /* We have to check which message has been received */
{
case messageType.ACTION: /* We received a message whith an input which has to be sent to the system queue */
inputSend(msg.act); /* Function that inject the input in the system */
break;
case messageType.DISCONNECT: /* We received a "Disconnect" message */
this.clientSocket.Close(); /* We have to close the TcpClient on which we are receiving the messages */
this.target = false; /* Obviously this server isn't longer the target! */
Invoke(new editLabel(this.editLabel), new object[] { statusInfo, "DISCONNECTED" }); /* The server status is now "DISCONNECTED" */
Invoke(new editLabel(this.editLabel), new object[] { targetInfo, "FALSE" }); /* And this server is not longer the target */
breaker = false; /* We have to break out from the inner loop in order to accept another client connection. */
break;
case messageType.TARGET_CHANGED: /* This server is not longer the target, but the client is still connected */
this.target = false;
Invoke(new editLabel(this.editLabel), new object[] { targetInfo, "FALSE" }); /* This server is not longer the target */
break;
case messageType.TARGET: /* This server is now the target! */
this.target = true;
Invoke(new editLabel(this.editLabel), new object[] { targetInfo, "TRUE" });
break;
}
}
}
catch (SocketException se)
{
if (se.ErrorCode == 123456789) /* If the error code is 123456789, the other side of the connection has probably chashed. Then we have to close the actual connection and to wait for a new client connection */
{
this.clientSocket.Close(); /* We have to close the socket (due to the crashing of the other connection side) */
this.target = false; /* And obviously this server is not longer the target. */
/*
* We have also to update the info to show to the user this server is not longer connected.
*/
Invoke(new editLabel(this.editLabel), new object[] { statusInfo, "DISCONNECTED" });
Invoke(new editLabel(this.editLabel), new object[] { targetInfo, "FALSE" });
breaker = false;
}
continue;
}
catch (IOException)
{
continue;
}
catch (ObjectDisposedException)
{
continue;
}
catch (Exception except)
{
MessageBox.Show(except.Message.ToString());
}
}
}
/*
* Function of clipSender thread. This thread will stay blocked waiting for a condition variable set, performed by the main thread
* when the user makes a double click on a server.
*/
private void clipSenderFunction()
{
byte[] data;
while (true) /*This function runs until the Application is active.*/
{
try
{
Invoke(new makeInvisible(makeInvisible), remotePasteProgressBar); /* If a remote paste progress bar is visible, we have to make it invisible */
send.WaitOne(); /*Wait for a notification from the main thread*/
Invoke(new makeVisible(makeVisible), remotePasteProgressBar); /* Because we have to send data toward the targetServer, we show the progressBar to inform the user on the transfer */
IPEndPoint remoteServerIpEndPoint = targetServer.Client.RemoteEndPoint as IPEndPoint; /*Get ip address of the server actually connected*/
message msg = new message();
msg.messType = messageType.REMOTE_PASTE; /* The operation to perform is a remote paste! */
if (Clipboard.ContainsText()) /* The clipboard contains text! */
{
String text = Clipboard.GetText(); /* Here we get the text copied in the clipboard */
data = Encoding.Unicode.GetBytes(text); /* We have to get the byte array of the text, in order to send this through a socket. */
msg.cinf.ct = clipboardType.TEXT; /* We are sending text! */
msg.cinf.size = data.Length; /* We have to sent even the amount of text bytes in order to receive the whole array */
}
else if (Clipboard.ContainsImage()) /*The clipboard contains an Image!*/
{
Image img = Clipboard.GetImage(); /*We have to get the image object..*/
data = SocketCommunication.serialize(img); /* and to serialize it! */
msg.cinf.ct = clipboardType.IMAGE; /*The data is an Image*/
msg.cinf.size = data.Length;
}
else if (Clipboard.ContainsAudio()) /* The clipboard contains an audio stream! */
{
Stream audio = Clipboard.GetAudioStream(); /*We have to get the stream object..*/
data = SocketCommunication.serialize(audio); /* and to serialize it! */
msg.cinf.ct = clipboardType.AUDIO; /* Tha clipboard data is an audio stream! */
msg.cinf.size = data.Length;
}
else if (Clipboard.ContainsFileDropList()) /* The clipboard contains files! */
{
string archPath = SocketCommunication.createArchive(); /*This function creates an archive with all files in the clipboard*/
FileInfo fi = new FileInfo(archPath); /* Object containing info about the archive */
if (fi.Length > 10 * 1024 * 1024) /* If the zip size is more than 10 MB */
{
DialogResult confirmResult = MessageBox.Show("Sei davvero sicuro di voler trasferire più di 10 MB di dati?",
"Conferma Trasferimento",
MessageBoxButtons.YesNo); /* We have to show a confirm button, in order to avoid network overhead. */
if (confirmResult == DialogResult.No) /* If the user doesn't want to transfer the file.. */
{
continue; /* We have to continue */
}
}
msg.cinf.ct = clipboardType.FILES; /* The clipboard data is a FileDropList! */
msg.cinf.size = (int)fi.Length; /* Size of the archive that is going to be sent */
using (TcpClient clientSendData = new TcpClient()) /*Socket used to send clipboard data to server */
{
clientSendData.Connect(remoteServerIpEndPoint.Address, 9998); /* We have to connect to the target server, port 9998 */
SocketCommunication.sendBufferToSocket(SocketCommunication.rawSerialize(msg), clientSendData);
SocketCommunication.sendFileToSocket(clientSendData, archPath);
clientSendData.Close();
}
continue;
}
else
{
msg.cinf.ct = clipboardType.NO_VALID_DATA;
data = new byte[4];
}
if (data.Length > 10 * 1024 * 1024) /* If the clipboard data is bigger than 10 MB */
{
DialogResult confirmResult = MessageBox.Show("Sei davvero sicuro di voler trasferire più di 10 MB di dati?",
"Conferma Trasferimento",
MessageBoxButtons.YesNo); /* We have to show a confirm button, in order to avoid network overhead. */
if (confirmResult == DialogResult.No) /* If the user doesn't want to transfer the file.. */
{
continue; /* We have to continue */
}
}
using (TcpClient clientSendData = new TcpClient()) /*Socket used to send clipboard data to server */
{
clientSendData.Connect(remoteServerIpEndPoint.Address, 9998); /* We have to connect to the target server, port 9998 */
SocketCommunication.sendBufferToSocket(SocketCommunication.rawSerialize(msg), clientSendData); /* Struct Sending */
SocketCommunication.sendChunks(clientSendData, data); /* Data sending */
clientSendData.Close();
}
}
catch (SocketException) /* The exceptions that occurs will be catched here and the thread will not terminate! This thread has to remain active while the application ends */
{
continue;
}
catch (IOException)
{
continue;
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}
}
