Return to fatalerrorhandler.cpp CVS log

Up to [truecrypt] / truecrypt / main

5.0

/*
 Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.4 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#include "System.h"
#include <wx/stackwalk.h>

#include "Main.h"
#include "UserInterface.h"
#include "GraphicUserInterface.h"

#ifdef TC_UNIX
#include <signal.h>
#endif

#ifdef TC_MACOSX
#	ifdef __ppc__
#		include <ppc/ucontext.h>
#	else
#		include <i386/ucontext.h>
#	endif
#endif

#include "FatalErrorHandler.h"

namespace TrueCrypt
{
	static terminate_handler DefaultTerminateHandler;

	struct FatalErrorReport
	{
		bool UnhandledException;
	};

#ifdef TC_UNIX
	static void OnFatalProgramErrorSignal (int, siginfo_t *signalInfo, void *contextArg)
	{
		ucontext_t *context = (ucontext_t *) contextArg;
		uint64 faultingInstructionAddress = 0;

#ifdef TC_LINUX
#	ifdef REG_EIP
		faultingInstructionAddress = context->uc_mcontext.gregs[REG_EIP];
#	elif defined (REG_RIP)
		faultingInstructionAddress = context->uc_mcontext.gregs[REG_RIP];
#	endif

#elif defined (TC_MACOSX)
#	ifdef __ppc__
		faultingInstructionAddress = context->uc_mcontext->ss.srr0;
#	elif defined (__x86_64__)
		faultingInstructionAddress = context->uc_mcontext->ss.rip;
#	else
		faultingInstructionAddress = context->uc_mcontext->ss.eip;
#	endif

#endif

		wstringstream vars;
		vars << L"err=" << signalInfo->si_signo;
		vars << L"&addr=" << hex << faultingInstructionAddress << dec;
		
#if wxUSE_STACKWALKER == 1

		class StackWalker : public wxStackWalker
		{
		public:
			StackWalker () : FrameCount (0) { }

			void OnStackFrame (const wxStackFrame &frame)
			{
				if (FrameCount > 8)
					return;

				StackVars << L"&st" << FrameCount++ << L"=" << hex << frame.GetAddress();
			}

			int FrameCount;
			wstringstream StackVars;
		};

		StackWalker stackWalker;
		stackWalker.Walk (1);
		if (!stackWalker.StackVars.str().empty())
			vars << stackWalker.StackVars.str();

#endif // wxUSE_STACKWALKER

		wxString url = Gui->GetHomepageLinkURL (L"err-report", vars.str());
		url.Replace (L"0x", L"");

		wxString msg = L"A critical error has occured and TrueCrypt must be terminated. If this is caused by a bug in TrueCrypt, we would like to fix it. To help us, you can send us an automatically generated error report containing the following items:\n\n- Program version\n- Operating system version\n- Hardware architecture\n- Error category\n- Error address\n";
#if wxUSE_STACKWALKER == 1
		msg += L"- TrueCrypt call stack\n";
#endif
		msg += L"\nIf you select 'Yes', the following URL (which contains the entire error report) will be opened in your default Internet browser.\n\n";
#ifdef __WXGTK__
		wxString fUrl = url;
		fUrl.Replace (L"&st", L" &st");
		msg += fUrl;
#else
		msg += url;
#endif
		msg += L"\n\nDo you want to send us the error report?";

		if (Gui->AskYesNo (msg, true))
			wxLaunchDefaultBrowser (url, wxBROWSER_NEW_WINDOW);

		_exit (1);
	}
#endif // TC_UNIX

	void FatalErrorHandler::Deregister()
	{
#ifdef TC_UNIX
		signal (SIGILL, SIG_DFL);
		signal (SIGFPE, SIG_DFL);
		signal (SIGSEGV, SIG_DFL);
		signal (SIGBUS, SIG_DFL);
		signal (SIGSYS, SIG_DFL);
#endif

#ifndef TC_WINDOWS
		std::set_terminate (DefaultTerminateHandler);
#endif
	}

	void FatalErrorHandler::OnTerminate ()
	{
		try
		{
			throw;
		}
		catch (UserAbort&)
		{
		}
		catch (Exception &e)
		{
			wxString vars;

			wxString exName = StringConverter::ToWide (StringConverter::GetTypeName (typeid (e)));
			if (exName.find (L"TrueCrypt::") != string::npos)
				exName = exName.Mid (11);

			wxString exPos = StringConverter::ToWide (e.what());
			if (exPos.find (L"TrueCrypt::") != string::npos)
				exPos = exPos.Mid (11);

			vars << L"&exception=" << exName;
			vars << L"&exlocation=" << exPos;
			vars.Replace (L"::", L".");
			vars.Replace (L":", L".");

			wxString url = Gui->GetHomepageLinkURL (L"err-report", vars);

			wxString msg = L"An unhandled exception has occured and TrueCrypt must be terminated. If this is caused by a bug in TrueCrypt, we would like to fix it. To help us, you can send us an automatically generated error report containing the following items:\n\n- Program version\n- Operating system version\n- Hardware architecture\n- Error description\n- Error location\n";
			msg += L"\nIf you select 'Yes', the following URL (which contains the entire error report) will be opened in your default Internet browser.\n\n";
			msg += url;
			msg += L"\n\nDo you want to send us the error report?";

			if (Gui->AskYesNo (msg, true))
				wxLaunchDefaultBrowser (url, wxBROWSER_NEW_WINDOW);

		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
		catch (...)
		{
			Gui->ShowError (_("Unknown exception occurred."));
		}

		_exit (1);
	}

	void FatalErrorHandler::Register ()
	{
#ifndef TC_WINDOWS
		 // OnUnhandledException() seems to be called only on Windows
		DefaultTerminateHandler = std::set_terminate (OnTerminate);
#endif

#ifdef TC_UNIX
		struct sigaction action;
		Memory::Zero (&action, sizeof (action));
		action.sa_flags = SA_SIGINFO;
		action.sa_sigaction = OnFatalProgramErrorSignal;

		throw_sys_if (sigaction (SIGILL, &action, nullptr) == -1);
		throw_sys_if (sigaction (SIGFPE, &action, nullptr) == -1);
		throw_sys_if (sigaction (SIGSEGV, &action, nullptr) == -1);
		throw_sys_if (sigaction (SIGBUS, &action, nullptr) == -1);
		throw_sys_if (sigaction (SIGSYS, &action, nullptr) == -1);
#endif
	}
}

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.