Защита памяти в VeraCrypt

/*
 Copyright (c) 2014 IDRIX. All rights reserved.

 Governed by the VeraCrypt License the full text of which is contained in
 the file License.txt included in VeraCrypt binary and source code distribution
 packages.
*/

#ifndef TC_HEADER_Main_Forms_WaitDialog
#define TC_HEADER_Main_Forms_WaitDialog

#include "Forms.h"
#include "Main/Main.h"
#include "Main/Application.h"
#include <wx/msgqueue.h>

namespace VeraCrypt
{

	DECLARE_LOCAL_EVENT_TYPE(wxEVT_COMMAND_WAITDIALOGTHREAD_COMPLETED, -1);
	DECLARE_LOCAL_EVENT_TYPE(wxEVT_COMMAND_WAITDIALOG_ADMIN_PASSWORD, -1);
	DECLARE_LOCAL_EVENT_TYPE(wxEVT_COMMAND_WAITDIALOG_PIN, -1);
	DECLARE_LOCAL_EVENT_TYPE(wxEVT_COMMAND_WAITDIALOG_SHOW_MSG, -1);
	
	class WaitDialog;



	class WaitThread : public wxThread
	{
	public:
		WaitThread(WaitDialog *handler, WaitThreadRoutine* pRoutine) : wxThread(wxTHREAD_DETACHED), m_pRoutine(pRoutine)
		{
			m_pHandler = handler;			
		}
		~WaitThread()
		{			
		}
		
	protected:
		virtual ExitCode Entry();
		WaitDialog *m_pHandler;
		WaitThreadRoutine* m_pRoutine;
	};

	class WaitDialog : public WaitDialogBase, public WaitThreadUI
	{
	public:
		WaitDialog (wxWindow *parent, const wxString& label, WaitThreadRoutine* pRoutine) 
			: WaitDialogBase(parent), WaitThreadUI(pRoutine), m_timer (this)
		{
			WaitStaticText->SetLabel (label);
			WaitProgessBar->Pulse();
			Layout();
			GetSizer()->Fit( this );
			Centre( wxBOTH );
			Connect( wxID_ANY, wxEVT_COMMAND_WAITDIALOGTHREAD_COMPLETED, wxCommandEventHandler( WaitDialog::OnThreadCompletion ) );
			Connect( wxID_ANY, wxEVT_COMMAND_WAITDIALOG_ADMIN_PASSWORD, wxCommandEventHandler( WaitDialog::OnAdminPasswordRequest ) );
			Connect( wxID_ANY, wxEVT_COMMAND_WAITDIALOG_PIN, wxCommandEventHandler( WaitDialog::OnPinRequest ) );
			Connect( wxID_ANY, wxEVT_COMMAND_WAITDIALOG_SHOW_MSG, wxCommandEventHandler( WaitDialog::OnShowMsg ) );
			
			Connect( wxEVT_TIMER, wxTimerEventHandler( WaitDialog::OnProgressTimer ), NULL, this );
			m_thread = new WaitThread(this, pRoutine);
		}
		
		~WaitDialog()
		{
			Disconnect( wxEVT_TIMER, wxTimerEventHandler( WaitDialog::OnProgressTimer ));
			Disconnect( wxID_ANY, wxEVT_COMMAND_WAITDIALOGTHREAD_COMPLETED, wxCommandEventHandler( WaitDialog::OnThreadCompletion ) );
			Disconnect( wxID_ANY, wxEVT_COMMAND_WAITDIALOG_ADMIN_PASSWORD, wxCommandEventHandler( WaitDialog::OnAdminPasswordRequest ) );
			Disconnect( wxID_ANY, wxEVT_COMMAND_WAITDIALOG_PIN, wxCommandEventHandler( WaitDialog::OnPinRequest ) );
			Disconnect( wxID_ANY, wxEVT_COMMAND_WAITDIALOG_SHOW_MSG, wxCommandEventHandler( WaitDialog::OnShowMsg ) );
		}

		virtual void OnWaitDialogInit( wxInitDialogEvent& event )
		{	
			m_thread->Run();
			m_timer.Start(100);
		}

		int GetCharWidth (wxWindow *window) const
		{
			int width;
			int height;
			window->GetTextExtent (L"a", &width, &height);

			if (width < 1)
				return 7;

			return width;
		}

		class ShowMessageParam
		{
		public:
			wxString m_message;
			wxString m_caption;
			long m_style;
			bool m_topMost;
			ShowMessageParam(const wxString &message, const wxString &caption,long style, bool topMost)
				: m_message(message), m_caption(caption), m_style(style), m_topMost(topMost)
			{}
		};

		int RequestShowMessage (const wxString &message, const wxString &caption,long style, bool topMost)
		{
			long lResult = -1;
			if (m_queue.IsOk())
			{
				wxString sResult;
				ShowMessageParam* pParam = new ShowMessageParam(message, caption, style, topMost);
				wxCommandEvent* pEvent = new wxCommandEvent( wxEVT_COMMAND_WAITDIALOG_SHOW_MSG,0);
				pEvent->SetClientData (pParam);
				wxQueueEvent (this, pEvent);
				m_queue.Receive (sResult);
				sResult.ToLong(&lResult);
			}	
			return (int) lResult;
		}

		void RequestAdminPassword (wxString& adminPassword)
		{
			if (m_queue.IsOk())
			{
				wxQueueEvent (this, new wxCommandEvent( wxEVT_COMMAND_WAITDIALOG_ADMIN_PASSWORD,0));
				if (wxMSGQUEUE_NO_ERROR != m_queue.Receive (adminPassword))
					adminPassword = wxT("");
			}
			else
				adminPassword = wxT("");
		}

		void RequestPin (wxString& pin)
		{
			if (m_queue.IsOk())
			{
				wxCommandEvent* pEvent = new wxCommandEvent( wxEVT_COMMAND_WAITDIALOG_PIN,0);
				pEvent->SetString (pin);
				wxQueueEvent (this, pEvent);
				if (wxMSGQUEUE_NO_ERROR != m_queue.Receive (pin))
					pin = wxT("");
			}
			else
				pin = wxT("");
		}
		
		// virtual void OnWaitDialogClose( wxCloseEvent& event ) { }
		void OnThreadCompletion(wxCommandEvent &)
		{
			m_queue.Clear();
			EndModal(0);
		}

		void OnAdminPasswordRequest(wxCommandEvent &)
		{

			wxPasswordEntryDialog dialog (this, _("Enter your user password or administrator password:"), _("Administrator privileges required"));
			if (dialog.ShowModal() != wxID_OK)
				m_queue.Post(wxT(""));
			else
				m_queue.Post(dialog.GetValue());
		}



		void OnPinRequest(wxCommandEvent &e)
		{

			wxPasswordEntryDialog dialog (this, wxString::Format (LangString["ENTER_TOKEN_PASSWORD"], e.GetString()), LangString["IDD_TOKEN_PASSWORD"]);
			dialog.SetSize (wxSize (GetCharWidth (&dialog) * 50, -1));

			if (dialog.ShowModal() != wxID_OK)
				m_queue.Post(wxT(""));
			else
				m_queue.Post(dialog.GetValue());
		}

		void OnShowMsg(wxCommandEvent &e)
		{
			ShowMessageParam* pParam = (ShowMessageParam*) e.GetClientData();
			if (pParam->m_topMost)
			{
				if (!IsActive())
					RequestUserAttention (wxUSER_ATTENTION_ERROR);

				pParam->m_style |= wxSTAY_ON_TOP;
			}

			int iResult = wxMessageBox (pParam->m_message, pParam->m_caption, pParam->m_style, this);
			delete pParam;		
			m_queue.Post(wxString::Format(wxT("%d"), iResult));
		}
		
		void OnProgressTimer(wxTimerEvent& event)
		{
			WaitProgessBar->Pulse();
		}

		virtual void Run(void) { ShowModal(); if (m_pRoutine->HasException()) ThrowException(m_pRoutine->m_pException); }

		void ThrowException(Exception* ex);

	protected:
		WaitThread* m_thread;
		wxTimer m_timer;
		wxMessageQueue<wxString> m_queue;
	};
}

#endif // TC_HEADER_Main_Forms_WaitDialog