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#include <cassert>
#include <cwchar>
#include <iostream>
#include <sstream>
#include <thread>
#include "windows_crashcatcher.hpp"
#include "windows_crashmonitor.hpp"
#include "windows_crashshm.hpp"
#include <SDL_messagebox.h>
namespace Crash
{
HANDLE duplicateHandle(HANDLE handle)
{
HANDLE duplicate;
if (!DuplicateHandle(GetCurrentProcess(), handle,
GetCurrentProcess(), &duplicate,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
throw std::runtime_error("Crash monitor could not duplicate handle");
}
return duplicate;
}
CrashCatcher* CrashCatcher::sInstance = nullptr;
CrashCatcher::CrashCatcher(int argc, char **argv, const std::string& crashLogPath)
{
assert(sInstance == nullptr); // don't allow two instances
sInstance = this;
HANDLE shmHandle = nullptr;
for (int i=0; i<argc; ++i)
{
if (strcmp(argv[i], "--crash-monitor"))
continue;
if (i >= argc - 1)
throw std::runtime_error("Crash monitor is missing the SHM handle argument");
sscanf(argv[i + 1], "%p", &shmHandle);
break;
}
if (!shmHandle)
{
setupIpc();
startMonitorProcess(crashLogPath);
installHandler();
}
else
{
CrashMonitor(shmHandle).run();
exit(0);
}
}
CrashCatcher::~CrashCatcher()
{
sInstance = nullptr;
if (mShm && mSignalMonitorEvent)
{
shmLock();
mShm->mEvent = CrashSHM::Event::Shutdown;
shmUnlock();
SetEvent(mSignalMonitorEvent);
}
if (mShmHandle)
CloseHandle(mShmHandle);
}
void CrashCatcher::setupIpc()
{
SECURITY_ATTRIBUTES attributes;
ZeroMemory(&attributes, sizeof(attributes));
attributes.bInheritHandle = TRUE;
mSignalAppEvent = CreateEventW(&attributes, FALSE, FALSE, NULL);
mSignalMonitorEvent = CreateEventW(&attributes, FALSE, FALSE, NULL);
mShmHandle = CreateFileMappingW(INVALID_HANDLE_VALUE, &attributes, PAGE_READWRITE, HIWORD(sizeof(CrashSHM)), LOWORD(sizeof(CrashSHM)), NULL);
if (mShmHandle == nullptr)
throw std::runtime_error("Failed to allocate crash catcher shared memory");
mShm = reinterpret_cast<CrashSHM*>(MapViewOfFile(mShmHandle, FILE_MAP_ALL_ACCESS, 0, 0, sizeof(CrashSHM)));
if (mShm == nullptr)
throw std::runtime_error("Failed to map crash catcher shared memory");
mShmMutex = CreateMutexW(&attributes, FALSE, NULL);
if (mShmMutex == nullptr)
throw std::runtime_error("Failed to create crash catcher shared memory mutex");
}
void CrashCatcher::shmLock()
{
if (WaitForSingleObject(mShmMutex, CrashCatcherTimeout) != WAIT_OBJECT_0)
throw std::runtime_error("SHM lock timed out");
}
void CrashCatcher::shmUnlock()
{
ReleaseMutex(mShmMutex);
}
void CrashCatcher::waitMonitor()
{
if (WaitForSingleObject(mSignalAppEvent, CrashCatcherTimeout) != WAIT_OBJECT_0)
throw std::runtime_error("Waiting for monitor failed");
}
void CrashCatcher::signalMonitor()
{
SetEvent(mSignalMonitorEvent);
}
void CrashCatcher::installHandler()
{
SetUnhandledExceptionFilter(vectoredExceptionHandler);
}
void CrashCatcher::startMonitorProcess(const std::string& crashLogPath)
{
std::wstring executablePath;
DWORD copied = 0;
do {
executablePath.resize(executablePath.size() + MAX_PATH);
copied = GetModuleFileNameW(nullptr, executablePath.data(), static_cast<DWORD>(executablePath.size()));
} while (copied >= executablePath.size());
executablePath.resize(copied);
memset(mShm->mStartup.mLogFilePath, 0, sizeof(mShm->mStartup.mLogFilePath));
size_t length = crashLogPath.length();
if (length >= MAX_LONG_PATH) length = MAX_LONG_PATH - 1;
strncpy(mShm->mStartup.mLogFilePath, crashLogPath.c_str(), length);
mShm->mStartup.mLogFilePath[length] = '\0';
// note that we don't need to lock the SHM here, the other process has not started yet
mShm->mEvent = CrashSHM::Event::Startup;
mShm->mStartup.mShmMutex = duplicateHandle(mShmMutex);
mShm->mStartup.mAppProcessHandle = duplicateHandle(GetCurrentProcess());
mShm->mStartup.mSignalApp = duplicateHandle(mSignalAppEvent);
mShm->mStartup.mSignalMonitor = duplicateHandle(mSignalMonitorEvent);
std::wstringstream ss;
ss << "--crash-monitor " << std::hex << duplicateHandle(mShmHandle);
std::wstring arguments(ss.str());
STARTUPINFOW si;
ZeroMemory(&si, sizeof(si));
PROCESS_INFORMATION pi;
ZeroMemory(&pi, sizeof(pi));
if (!CreateProcessW(executablePath.data(), arguments.data(), NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi))
throw std::runtime_error("Could not start crash monitor process");
waitMonitor();
}
LONG CrashCatcher::vectoredExceptionHandler(PEXCEPTION_POINTERS info)
{
switch (info->ExceptionRecord->ExceptionCode)
{
case EXCEPTION_SINGLE_STEP:
case EXCEPTION_BREAKPOINT:
case DBG_PRINTEXCEPTION_C:
return EXCEPTION_EXECUTE_HANDLER;
}
if (!sInstance)
return EXCEPTION_EXECUTE_HANDLER;
sInstance->handleVectoredException(info);
_Exit(1);
}
void CrashCatcher::handleVectoredException(PEXCEPTION_POINTERS info)
{
shmLock();
mShm->mEvent = CrashSHM::Event::Crashed;
mShm->mCrashed.mThreadId = GetCurrentThreadId();
mShm->mCrashed.mContext = *info->ContextRecord;
mShm->mCrashed.mExceptionRecord = *info->ExceptionRecord;
shmUnlock();
signalMonitor();
// must remain until monitor has finished
waitMonitor();
std::string message = "OpenMW has encountered a fatal error.\nCrash log saved to '" + std::string(mShm->mStartup.mLogFilePath) + "'.\n Please report this to https://gitlab.com/OpenMW/openmw/issues !";
SDL_ShowSimpleMessageBox(0, "Fatal Error", message.c_str(), nullptr);
}
} // namespace Crash
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