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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include <windows.h>
#include <shlwapi.h>
#include <objbase.h>
#include <filesystem>
#include "../ScheduledTaskRemove.h"
#include "mozilla/CmdLineAndEnvUtils.h"
using namespace mozilla::default_agent;
// See BackgroundTask_defaultagent.sys.mjs for arguments.
int wmain(int argc, wchar_t** argv) {
// Firefox deescalates process permissions, so handle task unscheduling step
// here instead of the Firefox Background Tasks to ensure cleanup for other
if (!wcscmp(argv[1], L"uninstall")) {
if (argc < 3 || !argv[2]) {
return E_INVALIDARG;
}
HRESULT hr = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
if (FAILED(hr)) {
return hr;
}
RemoveTasks(argv[2], WhichTasks::AllTasksForInstallation);
CoUninitialize();
// Background Task handles remainder of uninstall.
}
std::vector<wchar_t> path(MAX_PATH, 0);
DWORD charsWritten = GetModuleFileNameW(nullptr, path.data(), path.size());
// GetModuleFileNameW returns the count of characters written including null
// when truncated, excluding null otherwise. Therefore the count will always
// be less than the buffer size when not truncated.
while (charsWritten == path.size()) {
path.resize(path.size() * 2, 0);
charsWritten = GetModuleFileNameW(nullptr, path.data(), path.size());
}
if (charsWritten == 0) {
return E_UNEXPECTED;
}
std::filesystem::path programPath = path.data();
programPath = programPath.parent_path();
programPath += L"\\" MOZ_APP_NAME L".exe";
std::vector<const wchar_t*> childArgv;
childArgv.push_back(programPath.c_str());
childArgv.push_back(L"--backgroundtask");
childArgv.push_back(L"defaultagent");
// Skip argv[0], path to this exectuable.
for (int i = 1; i < argc; i++) {
childArgv.push_back(argv[i]);
}
auto cmdLine = mozilla::MakeCommandLine(childArgv.size(), childArgv.data());
STARTUPINFOW si = {};
si.cb = sizeof(STARTUPINFOW);
PROCESS_INFORMATION pi = {};
// Runs `{program path} --backgoundtask defaultagent`.
CreateProcessW(programPath.c_str(), cmdLine.get(), nullptr, nullptr, false,
DETACHED_PROCESS | NORMAL_PRIORITY_CLASS, nullptr, nullptr,
&si, &pi);
// Wait until process exists so uninstalling doesn't interrupt the background
// task cleaning registry entries.
DWORD exitCode;
if (WaitForSingleObject(pi.hProcess, INFINITE) == WAIT_OBJECT_0 &&
::GetExitCodeProcess(pi.hProcess, &exitCode)) {
// Match EXIT_CODE in BackgroundTasksManager.sys.mjs and
// BackgroundTask_defaultagent.sys.mjs.
enum EXIT_CODE {
SUCCESS = 0,
NOT_FOUND = 2,
EXCEPTION = 3,
TIMEOUT = 4,
DISABLED_BY_POLICY = 11,
INVALID_ARGUMENT = 12,
MUTEX_NOT_LOCKABLE = 13,
};
switch (exitCode) {
case SUCCESS:
return S_OK;
case NOT_FOUND:
return E_UNEXPECTED;
case EXCEPTION:
return E_FAIL;
case TIMEOUT:
return E_FAIL;
case DISABLED_BY_POLICY:
return HRESULT_FROM_WIN32(ERROR_ACCESS_DISABLED_BY_POLICY);
case INVALID_ARGUMENT:
return E_INVALIDARG;
case MUTEX_NOT_LOCKABLE:
return HRESULT_FROM_WIN32(ERROR_SHARING_VIOLATION);
default:
return E_UNEXPECTED;
}
}
return E_UNEXPECTED;
}