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#undef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <Psapi.h>
#include <DbgHelp.h>
#include <iostream>
#include <memory>
#include <sstream>
#include "windows_crashcatcher.hpp"
#include "windows_crashmonitor.hpp"
#include "windows_crashshm.hpp"
#include <components/debug/debuglog.hpp>
namespace Crash
{
CrashMonitor::CrashMonitor(HANDLE shmHandle)
: mShmHandle(shmHandle)
{
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 monitor shared memory");
// accessing SHM without lock is OK here, the parent waits for a signal before continuing
mShmMutex = mShm->mStartup.mShmMutex;
mAppProcessHandle = mShm->mStartup.mAppProcessHandle;
mSignalAppEvent = mShm->mStartup.mSignalApp;
mSignalMonitorEvent = mShm->mStartup.mSignalMonitor;
}
CrashMonitor::~CrashMonitor()
{
if (mShm)
UnmapViewOfFile(mShm);
// the handles received from the app are duplicates, we must close them
if (mShmHandle)
CloseHandle(mShmHandle);
if (mShmMutex)
CloseHandle(mShmMutex);
if (mSignalAppEvent)
CloseHandle(mSignalAppEvent);
if (mSignalMonitorEvent)
CloseHandle(mSignalMonitorEvent);
}
void CrashMonitor::shmLock()
{
if (WaitForSingleObject(mShmMutex, CrashCatcherTimeout) != WAIT_OBJECT_0)
throw std::runtime_error("SHM monitor lock timed out");
}
void CrashMonitor::shmUnlock()
{
ReleaseMutex(mShmMutex);
}
void CrashMonitor::signalApp() const
{
SetEvent(mSignalAppEvent);
}
bool CrashMonitor::waitApp() const
{
return WaitForSingleObject(mSignalMonitorEvent, CrashCatcherTimeout) == WAIT_OBJECT_0;
}
bool CrashMonitor::isAppAlive() const
{
DWORD code = 0;
GetExitCodeProcess(mAppProcessHandle, &code);
return code == STILL_ACTIVE;
}
void CrashMonitor::run()
{
try
{
// app waits for monitor start up, let it continue
signalApp();
bool running = true;
while (isAppAlive() && running)
{
if (waitApp())
{
shmLock();
switch (mShm->mEvent)
{
case CrashSHM::Event::None:
break;
case CrashSHM::Event::Crashed:
handleCrash();
running = false;
break;
case CrashSHM::Event::Shutdown:
running = false;
break;
case CrashSHM::Event::Startup:
break;
}
shmUnlock();
}
}
}
catch (...)
{
Log(Debug::Error) << "Exception in crash monitor, exiting";
}
signalApp();
}
std::wstring utf8ToUtf16(const std::string& utf8)
{
const int nLenWide = MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), utf8.size(), nullptr, 0);
std::wstring utf16;
utf16.resize(nLenWide);
if (MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), utf8.size(), utf16.data(), nLenWide) != nLenWide)
return {};
return utf16;
}
void CrashMonitor::handleCrash()
{
DWORD processId = GetProcessId(mAppProcessHandle);
try
{
HMODULE dbghelp = LoadLibraryA("dbghelp.dll");
if (dbghelp == NULL)
return;
using MiniDumpWirteDumpFn = BOOL (WINAPI*)(
HANDLE hProcess, DWORD ProcessId, HANDLE hFile, MINIDUMP_TYPE DumpType, PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam, PMINIDUMP_CALLBACK_INFORMATION CallbackParam
);
MiniDumpWirteDumpFn miniDumpWriteDump = (MiniDumpWirteDumpFn)GetProcAddress(dbghelp, "MiniDumpWriteDump");
if (miniDumpWriteDump == NULL)
return;
std::wstring utf16Path = utf8ToUtf16(mShm->mStartup.mLogFilePath);
if (utf16Path.empty())
return;
if (utf16Path.length() > MAX_PATH)
utf16Path = LR"(\\?\)" + utf16Path;
HANDLE hCrashLog = CreateFileW(utf16Path.c_str(), GENERIC_READ | GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
if (hCrashLog == NULL || hCrashLog == INVALID_HANDLE_VALUE)
return;
if (auto err = GetLastError(); err != ERROR_ALREADY_EXISTS && err != 0)
return;
EXCEPTION_POINTERS exp;
exp.ContextRecord = &mShm->mCrashed.mContext;
exp.ExceptionRecord = &mShm->mCrashed.mExceptionRecord;
MINIDUMP_EXCEPTION_INFORMATION infos = {};
infos.ThreadId = mShm->mCrashed.mThreadId;
infos.ExceptionPointers = &exp;
infos.ClientPointers = FALSE;
MINIDUMP_TYPE type = (MINIDUMP_TYPE)(MiniDumpWithDataSegs | MiniDumpWithHandleData);
miniDumpWriteDump(mAppProcessHandle, processId, hCrashLog, type, &infos, 0, 0);
}
catch (const std::exception&e)
{
Log(Debug::Error) << "CrashMonitor: " << e.what();
}
catch (...)
{
Log(Debug::Error) << "CrashMonitor: unknown exception";
}
}
} // namespace Crash
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