nssm.cpp

#include "nssm.h"

extern unsigned long tls_index;
extern BOOL is_admin;
extern imports_t imports;

static TCHAR unquoted_imagepath[PATH_LENGTH];
static TCHAR imagepath[PATH_LENGTH];
static TCHAR imageargv0[PATH_LENGTH];

void nssm_exit(int status)
{
	free_imports();
	unsetup_utf8();
	exit(status);
}

/* User requested us to print our version. */
static bool is_version(const TCHAR* s)
{
	if (!s || !*s) return false;
	/* /version */
	if (*s == '/') s++;
	else if (*s == '-')
	{
		/* -v, -V, -version, --version */
		s++;
		if (*s == '-') s++;
		else if (str_equiv(s, _T("v"))) return true;
	}
	if (str_equiv(s, _T("version"))) return true;
	return false;
}


/* How to use me correctly */
int usage(int ret)
{
	if ((!GetConsoleWindow() || !GetStdHandle(STD_OUTPUT_HANDLE)) && GetProcessWindowStation()) popup_message(0, MB_OK, NSSM_MESSAGE_USAGE, NSSM_VERSION, NSSM_CONFIGURATION, NSSM_DATE);
	else print_message(stderr, NSSM_MESSAGE_USAGE, NSSM_VERSION, NSSM_CONFIGURATION, NSSM_DATE);
	return(ret);
}

void check_admin()
{
	is_admin = false;

	/* Lifted from MSDN examples */
	PSID AdministratorsGroup;
	SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
	if (!AllocateAndInitializeSid(&NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &AdministratorsGroup)) return;
	CheckTokenMembership(0, AdministratorsGroup, /*XXX*/(PBOOL)&is_admin);
	FreeSid(AdministratorsGroup);
}

static int elevate(int argc, TCHAR** argv, unsigned long message)
{
	print_message(stderr, message);

	SHELLEXECUTEINFO sei;
	ZeroMemory(&sei, sizeof(sei));
	sei.cbSize = sizeof(sei);
	sei.lpVerb = _T("runas");
	sei.lpFile = (TCHAR*)nssm_imagepath();

	TCHAR* args = (TCHAR*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, EXE_LENGTH * sizeof(TCHAR));
	if (!args)
	{
		print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("GetCommandLine()"), _T("elevate()"));
		return 111;
	}

	/* Get command line, which includes the path to NSSM, and skip that part. */
	_sntprintf_s(args, EXE_LENGTH, _TRUNCATE, _T("%s"), GetCommandLine());
	size_t s = _tcslen(argv[0]) + 1;
	if (args[0] == _T('"')) s += 2;
	while (isspace(args[s])) s++;

	sei.lpParameters = args + s;
	sei.nShow = SW_SHOW;

	unsigned long exitcode = 0;
	if (!ShellExecuteEx(&sei)) exitcode = 100;

	HeapFree(GetProcessHeap(), 0, (void*)args);
	return exitcode;
}

int num_cpus()
{
	DWORD_PTR i, affinity, system_affinity;
	if (!GetProcessAffinityMask(GetCurrentProcess(), &affinity, &system_affinity)) return 64;
	for (i = 0; system_affinity & (1LL << i); i++) if (i == 64) break;
	return (int)i;
}

const TCHAR* nssm_unquoted_imagepath()
{
	return unquoted_imagepath;
}

const TCHAR* nssm_imagepath()
{
	return imagepath;
}

const TCHAR* nssm_exe()
{
	return imageargv0;
}

int _tmain(int argc, TCHAR** argv)
{
	if (check_console()) setup_utf8();

	/* Remember if we are admin */
	check_admin();

	/* Set up function pointers. */
	if (get_imports()) nssm_exit(111);

	/* Remember our path for later. */
	_sntprintf_s(imageargv0, _countof(imageargv0), _TRUNCATE, _T("%s"), argv[0]);
	PathQuoteSpaces(imageargv0);
	GetModuleFileName(0, unquoted_imagepath, _countof(unquoted_imagepath));
	GetModuleFileName(0, imagepath, _countof(imagepath));
	PathQuoteSpaces(imagepath);

	/* Elevate */
	if (argc > 1)
	{
		/*
		  Valid commands are:
		  start, stop, pause, continue, install, edit, get, set, reset, unset, remove
		  status, statuscode, rotate, list, processes, version
		*/
		if (is_version(argv[1]))
		{
			_tprintf(_T("%s %s %s %s\n"), NSSM, NSSM_VERSION, NSSM_CONFIGURATION, NSSM_DATE);
			nssm_exit(0);
		}
		if (str_equiv(argv[1], _T("start"))) nssm_exit(control_service(NSSM_SERVICE_CONTROL_START, argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("stop"))) nssm_exit(control_service(SERVICE_CONTROL_STOP, argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("restart")))
		{
			int ret = control_service(SERVICE_CONTROL_STOP, argc - 2, argv + 2);
			if (ret) nssm_exit(ret);
			nssm_exit(control_service(NSSM_SERVICE_CONTROL_START, argc - 2, argv + 2));
		}
		if (str_equiv(argv[1], _T("pause"))) nssm_exit(control_service(SERVICE_CONTROL_PAUSE, argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("continue"))) nssm_exit(control_service(SERVICE_CONTROL_CONTINUE, argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("status"))) nssm_exit(control_service(SERVICE_CONTROL_INTERROGATE, argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("statuscode"))) nssm_exit(control_service(SERVICE_CONTROL_INTERROGATE, argc - 2, argv + 2, true));
		if (str_equiv(argv[1], _T("rotate"))) nssm_exit(control_service(NSSM_SERVICE_CONTROL_ROTATE, argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("install")))
		{
			if (!is_admin) nssm_exit(elevate(argc, argv, NSSM_MESSAGE_NOT_ADMINISTRATOR_CANNOT_INSTALL));
			create_messages();
			nssm_exit(pre_install_service(argc - 2, argv + 2));
		}
		if (str_equiv(argv[1], _T("edit")) || str_equiv(argv[1], _T("get")) || str_equiv(argv[1], _T("set")) || str_equiv(argv[1], _T("reset")) || str_equiv(argv[1], _T("unset")) || str_equiv(argv[1], _T("dump")))
		{
			int ret = pre_edit_service(argc - 1, argv + 1);
			if (ret == 3 && !is_admin && argc == 3) nssm_exit(elevate(argc, argv, NSSM_MESSAGE_NOT_ADMINISTRATOR_CANNOT_EDIT));
			/* There might be a password here. */
			for (int i = 0; i < argc; i++) SecureZeroMemory(argv[i], _tcslen(argv[i]) * sizeof(TCHAR));
			nssm_exit(ret);
		}
		if (str_equiv(argv[1], _T("list"))) nssm_exit(list_nssm_services(argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("processes"))) nssm_exit(service_process_tree(argc - 2, argv + 2));
		if (str_equiv(argv[1], _T("remove")) || str_equiv(argv[1], _T("delete")))
		{
			if (!is_admin) nssm_exit(elevate(argc, argv, NSSM_MESSAGE_NOT_ADMINISTRATOR_CANNOT_REMOVE));
			nssm_exit(pre_remove_service(argc - 2, argv + 2));
		}
	}

	/* Thread local storage for error message buffer */
	tls_index = TlsAlloc();

	/* Register messages */
	if (is_admin) create_messages();

	/*
	  Optimisation for Windows 2000:
	  When we're run from the command line the StartServiceCtrlDispatcher() call
	  will time out after a few seconds on Windows 2000.  On newer versions the
	  call returns instantly.  Check for stdin first and only try to call the
	  function if there's no input stream found.  Although it's possible that
	  we're running with input redirected it's much more likely that we're
	  actually running as a service.
	  This will save time when running with no arguments from a command prompt.
	*/
	if (!GetStdHandle(STD_INPUT_HANDLE))
	{
		/* Start service magic */
		SERVICE_TABLE_ENTRY table[] = { { NSSM, service_main }, { 0, 0 } };
		if (!StartServiceCtrlDispatcher(table))
		{
			unsigned long error = GetLastError();
			/* User probably ran nssm with no argument */
			if (error == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) nssm_exit(usage(1));
			log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_DISPATCHER_FAILED, error_string(error), 0);
			nssm_exit(100);
		}
	}
	else nssm_exit(usage(1));

	/* And nothing more to do */
	nssm_exit(0);
}