barrier/platform/CWin32Platform.cpp

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#include "CWin32Platform.h"
#include "CLock.h"
#include "CThread.h"
#include "CLog.h"
#include "stdvector.h"
#include <cstring>
#include <shlobj.h>
#include <tchar.h>
//
// CWin32Platform
//
HANDLE CWin32Platform::s_eventLog = NULL;
CWin32Platform* CWin32Platform::s_daemonPlatform = NULL;
CWin32Platform::CWin32Platform()
{
// do nothing
}
CWin32Platform::~CWin32Platform()
{
// do nothing
}
bool
CWin32Platform::isWindows95Family()
{
OSVERSIONINFO version;
version.dwOSVersionInfoSize = sizeof(version);
if (GetVersionEx(&version) == 0) {
log((CLOG_WARN "cannot determine OS: %d", GetLastError()));
return true;
}
return (version.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
}
void
CWin32Platform::setStatus(
SERVICE_STATUS_HANDLE handle,
DWORD state)
{
setStatus(handle, state, 0, 0);
}
void
CWin32Platform::setStatus(
SERVICE_STATUS_HANDLE handle,
DWORD state,
DWORD step,
DWORD waitHint)
{
SERVICE_STATUS status;
status.dwServiceType = SERVICE_WIN32_OWN_PROCESS |
SERVICE_INTERACTIVE_PROCESS;
status.dwCurrentState = state;
status.dwControlsAccepted = SERVICE_ACCEPT_STOP |
SERVICE_ACCEPT_PAUSE_CONTINUE |
SERVICE_ACCEPT_SHUTDOWN;
status.dwWin32ExitCode = NO_ERROR;
status.dwServiceSpecificExitCode = 0;
status.dwCheckPoint = step;
status.dwWaitHint = waitHint;
SetServiceStatus(handle, &status);
}
void
CWin32Platform::setStatusError(
SERVICE_STATUS_HANDLE handle,
DWORD error)
{
SERVICE_STATUS status;
status.dwServiceType = SERVICE_WIN32_OWN_PROCESS |
SERVICE_INTERACTIVE_PROCESS;
status.dwCurrentState = SERVICE_STOPPED;
status.dwControlsAccepted = SERVICE_ACCEPT_STOP |
SERVICE_ACCEPT_PAUSE_CONTINUE |
SERVICE_ACCEPT_SHUTDOWN;
status.dwWin32ExitCode = ERROR_SERVICE_SPECIFIC_ERROR;
status.dwServiceSpecificExitCode = error;
status.dwCheckPoint = 0;
status.dwWaitHint = 0;
SetServiceStatus(handle, &status);
}
bool
CWin32Platform::installDaemon(
const char* name,
const char* description,
const char* pathname,
const char* commandLine)
{
// windows 95 family services
if (isWindows95Family()) {
// open registry
HKEY key = open95ServicesKey();
if (key == NULL) {
log((CLOG_ERR "cannot open RunServices registry key", GetLastError()));
return false;
}
// construct entry
CString value;
value += "\"";
value += pathname;
value += "\" ";
value += commandLine;
// install entry
setValue(key, name, value);
// clean up
closeKey(key);
return true;
}
// windows NT family services
else {
// open service manager
SC_HANDLE mgr = OpenSCManager(NULL, NULL, GENERIC_WRITE);
if (mgr == NULL) {
log((CLOG_ERR "OpenSCManager failed with %d", GetLastError()));
return false;
}
// create the servie
SC_HANDLE service = CreateService(mgr,
name,
name,
0,
SERVICE_WIN32_OWN_PROCESS |
SERVICE_INTERACTIVE_PROCESS,
SERVICE_AUTO_START,
SERVICE_ERROR_NORMAL,
pathname,
NULL,
NULL,
NULL,
NULL,
NULL);
// done with service and manager
if (service != NULL) {
CloseServiceHandle(service);
CloseServiceHandle(mgr);
}
else {
log((CLOG_ERR "CreateService failed with %d", GetLastError()));
CloseServiceHandle(mgr);
return false;
}
// open the registry key for this service
HKEY key = openNTServicesKey();
key = openKey(key, name);
if (key == NULL) {
// can't open key
uninstallDaemon(name);
return false;
}
// set the description
setValue(key, "Description", description);
// set command line
key = openKey(key, "Parameters");
if (key == NULL) {
// can't open key
uninstallDaemon(name);
return false;
}
setValue(key, "CommandLine", commandLine);
// done with registry
closeKey(key);
return true;
}
}
IPlatform::EResult
CWin32Platform::uninstallDaemon(
const char* name)
{
// windows 95 family services
if (isWindows95Family()) {
// open registry
HKEY key = open95ServicesKey();
if (key == NULL) {
log((CLOG_ERR "cannot open RunServices registry key", GetLastError()));
return kAlready;
}
// remove entry
deleteValue(key, name);
// clean up
closeKey(key);
return kSuccess;
}
// windows NT family services
else {
// remove parameters for this service
HKEY key = openNTServicesKey();
key = openKey(key, name);
if (key != NULL) {
deleteKey(key, "Parameters");
closeKey(key);
}
// open service manager
SC_HANDLE mgr = OpenSCManager(NULL, NULL, GENERIC_WRITE);
if (mgr == NULL) {
log((CLOG_ERR "OpenSCManager failed with %d", GetLastError()));
return kFailed;
}
// open the service. oddly, you must open a service to delete it.
EResult result;
SC_HANDLE service = OpenService(mgr, name, DELETE);
if (service == NULL) {
const DWORD e = GetLastError();
log((CLOG_ERR "OpenService failed with %d", e));
result = (e == ERROR_SERVICE_DOES_NOT_EXIST) ? kAlready : kFailed;
}
else {
if (DeleteService(service) != 0) {
result = kSuccess;
}
else {
const DWORD e = GetLastError();
switch (e) {
case ERROR_SERVICE_MARKED_FOR_DELETE:
result = kAlready;
break;
default:
result = kFailed;
break;
}
}
CloseServiceHandle(service);
}
// close the manager
CloseServiceHandle(mgr);
return result;
}
}
int
CWin32Platform::daemonize(
const char* name,
DaemonFunc func)
{
assert(name != NULL);
assert(func != NULL);
// windows 95 family services
if (isWindows95Family()) {
typedef DWORD (WINAPI *RegisterServiceProcessT)(DWORD, DWORD);
// mark this process as a service so it's not killed when the
// user logs off.
HINSTANCE kernel = LoadLibrary("kernel32.dll");
if (kernel == NULL) {
log((CLOG_ERR "LoadLibrary failed with %d", GetLastError()));
return -1;
}
RegisterServiceProcessT RegisterServiceProcess =
reinterpret_cast<RegisterServiceProcessT>(
GetProcAddress(kernel,
_T("RegisterServiceProcess")));
if (RegisterServiceProcess == NULL) {
log((CLOG_ERR "can't lookup RegisterServiceProcess: %d", GetLastError()));
FreeLibrary(kernel);
return -1;
}
if (RegisterServiceProcess(NULL, 1) == 0) {
log((CLOG_ERR "RegisterServiceProcess failed with %d", GetLastError()));
FreeLibrary(kernel);
return -1;
}
FreeLibrary(kernel);
// now simply call the daemon function
return func(this, 1, &name);
}
// windows NT family services
else {
// save daemon function
m_daemonFunc = func;
// construct the service entry
SERVICE_TABLE_ENTRY entry[2];
entry[0].lpServiceName = const_cast<char*>(name);
entry[0].lpServiceProc = &CWin32Platform::serviceMainEntry;
entry[1].lpServiceName = NULL;
entry[1].lpServiceProc = NULL;
// hook us up to the service control manager. this won't return
// (if successful) until the processes have terminated.
s_daemonPlatform = this;
if (StartServiceCtrlDispatcher(entry)) {
s_daemonPlatform = NULL;
return m_daemonResult;
}
log((CLOG_ERR "StartServiceCtrlDispatcher failed with %d", GetLastError()));
s_daemonPlatform = NULL;
return -1;
}
}
void
CWin32Platform::installDaemonLogger(
const char* name)
{
if (!CWin32Platform::isWindows95Family()) {
// open event log and direct log messages to it
if (s_eventLog == NULL) {
s_eventLog = RegisterEventSource(NULL, name);
if (s_eventLog != NULL) {
CLog::setOutputter(&CWin32Platform::serviceLogger);
}
}
}
}
int
CWin32Platform::restart(
RestartFunc func,
int /*minErrorCode*/)
{
// FIXME -- start in separate process or thread. note that this
// isn't too critical as win32 doesn't force us to terminate for
// any reason so we should never have to restart.
return func();
}
const char*
CWin32Platform::getBasename(
const char* pathname) const
{
if (pathname == NULL) {
return NULL;
}
// check for last /
const char* basename = strrchr(pathname, '/');
if (basename != NULL) {
++basename;
}
else {
basename = pathname;
}
// check for last backslash
const char* basename2 = strrchr(pathname, '\\');
if (basename2 != NULL && basename2 > basename) {
basename = basename2 + 1;
}
return basename;
}
CString
CWin32Platform::getUserDirectory() const
{
// try %HOMEPATH%
TCHAR dir[MAX_PATH];
DWORD size = sizeof(dir) / sizeof(TCHAR);
DWORD result = GetEnvironmentVariable(_T("HOMEPATH"), dir, size);
if (result != 0 && result <= size) {
// sanity check -- if dir doesn't appear to start with a
// drive letter and isn't a UNC name then don't use it
// FIXME -- allow UNC names
if (dir[0] != '\0' && (dir[1] == ':' ||
((dir[0] == '\\' || dir[0] == '/') &&
(dir[1] == '\\' || dir[1] == '/')))) {
return dir;
}
}
// get the location of the personal files. that's as close to
// a home directory as we're likely to find.
ITEMIDLIST* idl;
if (SUCCEEDED(SHGetSpecialFolderLocation(NULL, CSIDL_PERSONAL, &idl))) {
TCHAR* path = NULL;
if (SHGetPathFromIDList(idl, dir)) {
DWORD attr = GetFileAttributes(dir);
if (attr != 0xffffffff && (attr & FILE_ATTRIBUTE_DIRECTORY) != 0)
path = dir;
}
IMalloc* shalloc;
if (SUCCEEDED(SHGetMalloc(&shalloc))) {
shalloc->Free(idl);
shalloc->Release();
}
if (path != NULL) {
return path;
}
}
// use root of C drive as a default
return "C:";
}
CString
CWin32Platform::getSystemDirectory() const
{
// get windows directory
char dir[MAX_PATH];
if (GetWindowsDirectory(dir, sizeof(dir)) != 0) {
return dir;
}
else {
// can't get it. use C:\ as a default.
return "C:";
}
}
CString
CWin32Platform::addPathComponent(
const CString& prefix,
const CString& suffix) const
{
CString path;
path.reserve(prefix.size() + 1 + suffix.size());
path += prefix;
if (path.size() == 0 ||
(path[path.size() - 1] != '\\' &&
path[path.size() - 1] != '/')) {
path += '\\';
}
path += suffix;
return path;
}
HKEY
CWin32Platform::openKey(
HKEY key,
const char* keyName)
{
// open next key
HKEY newKey;
LONG result = RegOpenKeyEx(key, keyName, 0,
KEY_WRITE | KEY_QUERY_VALUE, &newKey);
if (result != ERROR_SUCCESS) {
DWORD disp;
result = RegCreateKeyEx(key, keyName, 0, _T(""),
0, KEY_WRITE | KEY_QUERY_VALUE,
NULL, &newKey, &disp);
}
if (result != ERROR_SUCCESS) {
RegCloseKey(key);
return NULL;
}
// switch to new key
RegCloseKey(key);
return newKey;
}
HKEY
CWin32Platform::openKey(
HKEY key,
const char** keyNames)
{
for (UInt32 i = 0; key != NULL && keyNames[i] != NULL; ++i) {
// open next key
key = openKey(key, keyNames[i]);
}
return key;
}
void
CWin32Platform::closeKey(
HKEY key)
{
assert(key != NULL);
RegCloseKey(key);
}
void
CWin32Platform::deleteKey(
HKEY key,
const char* name)
{
assert(key != NULL);
assert(name != NULL);
RegDeleteKey(key, name);
}
void
CWin32Platform::deleteValue(
HKEY key,
const char* name)
{
assert(key != NULL);
assert(name != NULL);
RegDeleteValue(key, name);
}
void
CWin32Platform::setValue(
HKEY key,
const char* name,
const CString& value)
{
assert(key != NULL);
assert(name != NULL);
RegSetValueEx(key, name, 0, REG_SZ,
reinterpret_cast<const BYTE*>(value.c_str()),
value.size() + 1);
}
CString
CWin32Platform::readValueString(
HKEY key,
const char* name)
{
// get the size of the string
DWORD type;
DWORD size = 0;
LONG result = RegQueryValueEx(key, name, 0, &type, NULL, &size);
if (result != ERROR_SUCCESS || type != REG_SZ) {
return CString();
}
// allocate space
char* buffer = new char[size];
// read it
result = RegQueryValueEx(key, name, 0, &type,
reinterpret_cast<BYTE*>(buffer), &size);
if (result != ERROR_SUCCESS || type != REG_SZ) {
delete[] buffer;
return CString();
}
// clean up and return value
CString value(buffer);
delete[] buffer;
return value;
}
HKEY
CWin32Platform::openNTServicesKey()
{
static const char* s_keyNames[] = {
_T("SYSTEM"),
_T("CurrentControlSet"),
_T("Services"),
NULL
};
return openKey(HKEY_LOCAL_MACHINE, s_keyNames);
}
HKEY
CWin32Platform::open95ServicesKey()
{
static const char* s_keyNames[] = {
_T("Software"),
_T("Microsoft"),
_T("Windows"),
_T("CurrentVersion"),
_T("RunServices"),
NULL
};
return openKey(HKEY_LOCAL_MACHINE, s_keyNames);
}
int
CWin32Platform::runDaemon(
RunFunc run,
StopFunc stop)
{
// should only be called from DaemonFunc
assert(m_serviceMutex != NULL);
CLock lock(m_serviceMutex);
try {
int result;
m_stop = stop;
m_serviceHandlerWaiting = false;
m_serviceRunning = false;
for (;;) {
// mark server as running
setStatus(m_statusHandle, SERVICE_RUNNING);
// run callback
m_serviceRunning = true;
result = run(m_serviceMutex);
m_serviceRunning = false;
// notify handler that the server stopped. if handler
// isn't waiting then we stopped unexpectedly and we
// quit.
if (m_serviceHandlerWaiting) {
m_serviceHandlerWaiting = false;
m_serviceState->broadcast();
}
else {
break;
}
// wait until we're told what to do next
while (*m_serviceState != SERVICE_RUNNING &&
*m_serviceState != SERVICE_STOPPED) {
m_serviceState->wait();
}
// exit loop if we've been told to stop
if (*m_serviceState == SERVICE_STOPPED) {
break;
}
}
// prevent daemonHandler from changing state
*m_serviceState = SERVICE_STOPPED;
// tell service control that the service is stopped.
// FIXME -- hopefully this will ensure that our handler won't
// be called again but i can't find documentation that
// verifies that. if it does it'll crash on the mutex that
// we're about to destroy.
setStatus(m_statusHandle, *m_serviceState);
// clean up
m_stop = NULL;
return result;
}
catch (...) {
// FIXME -- report error
// prevent serviceHandler from changing state
*m_serviceState = SERVICE_STOPPED;
// set status
setStatusError(m_statusHandle, 0);
// wake up serviceHandler if it's waiting then wait for it
if (m_serviceHandlerWaiting) {
m_serviceHandlerWaiting = false;
m_serviceState->broadcast();
m_serviceState->wait();
// serviceHandler has exited by now
}
throw;
}
}
void
CWin32Platform::serviceMain(
DWORD argc,
LPTSTR* argvIn)
{
typedef std::vector<LPCTSTR> ArgList;
typedef std::vector<CString> Arguments;
const char** argv = const_cast<const char**>(argvIn);
// open event log and direct log messages to it
installDaemonLogger(argv[0]);
// create synchronization objects
CThread::init();
m_serviceMutex = new CMutex;
m_serviceState = new CCondVar<DWORD>(m_serviceMutex, SERVICE_RUNNING);
// register our service handler functiom
m_statusHandle = RegisterServiceCtrlHandler(argv[0],
&CWin32Platform::serviceHandlerEntry);
if (m_statusHandle == NULL) {
// cannot start as service
m_daemonResult = -1;
delete m_serviceState;
delete m_serviceMutex;
return;
}
// tell service control manager that we're starting
setStatus(m_statusHandle, SERVICE_START_PENDING, 0, 1000);
// if no arguments supplied then try getting them from the registry.
// the first argument doesn't count because it's the service name.
Arguments args;
ArgList myArgv;
if (argc <= 1) {
// read command line
CString commandLine;
HKEY key = openNTServicesKey();
key = openKey(key, argv[0]);
key = openKey(key, "Parameters");
if (key != NULL) {
commandLine = readValueString(key, "CommandLine");
}
// if the command line isn't empty then parse and use it
if (!commandLine.empty()) {
// parse, honoring double quoted substrings
CString::size_type i = commandLine.find_first_not_of(" \t");
while (i != CString::npos && i != commandLine.size()) {
// find end of string
CString::size_type e;
if (commandLine[i] == '\"') {
// quoted. find closing quote.
++i;
e = commandLine.find("\"", i);
// whitespace must follow closing quote
if (e == CString::npos ||
(e + 1 != commandLine.size() &&
commandLine[e + 1] != ' ' &&
commandLine[e + 1] != '\t')) {
args.clear();
break;
}
// extract
args.push_back(commandLine.substr(i, e - i));
i = e + 1;
}
else {
// unquoted. find next whitespace.
e = commandLine.find_first_of(" \t", i);
if (e == CString::npos) {
e = commandLine.size();
}
// extract
args.push_back(commandLine.substr(i, e - i));
i = e + 1;
}
// next argument
i = commandLine.find_first_not_of(" \t", i);
}
// service name goes first
myArgv.push_back(argv[0]);
// get pointers
for (UInt32 i = 0; i < args.size(); ++i) {
myArgv.push_back(args[i].c_str());
}
// adjust argc/argv
argc = myArgv.size();
argv = &myArgv[0];
}
}
try {
// invoke daemon function
m_daemonResult = m_daemonFunc(this, static_cast<int>(argc), argv);
}
catch (CDaemonFailed& e) {
setStatusError(m_statusHandle, e.m_result);
m_daemonResult = -1;
}
catch (...) {
setStatusError(m_statusHandle, 1);
m_daemonResult = -1;
}
// clean up
delete m_serviceState;
delete m_serviceMutex;
// FIXME -- close event log?
}
void WINAPI
CWin32Platform::serviceMainEntry(
DWORD argc,
LPTSTR* argv)
{
s_daemonPlatform->serviceMain(argc, argv);
}
void
CWin32Platform::serviceHandler(
DWORD ctrl)
{
assert(m_serviceMutex != NULL);
assert(m_serviceState != NULL);
CLock lock(m_serviceMutex);
// ignore request if service is already stopped
if (*m_serviceState == SERVICE_STOPPED) {
setStatus(m_statusHandle, *m_serviceState);
return;
}
switch (ctrl) {
case SERVICE_CONTROL_PAUSE:
// update state
*m_serviceState = SERVICE_PAUSE_PENDING;
setStatus(m_statusHandle, *m_serviceState, 0, 1000);
// stop run callback if running and wait for it to finish
if (m_serviceRunning) {
m_serviceHandlerWaiting = true;
m_stop();
m_serviceState->wait();
}
// update state if service hasn't stopped while we were waiting
if (*m_serviceState != SERVICE_STOPPED) {
*m_serviceState = SERVICE_PAUSED;
}
m_serviceState->broadcast();
break;
case SERVICE_CONTROL_CONTINUE:
// required status update
setStatus(m_statusHandle, *m_serviceState);
// update state but let main loop send RUNNING notification
*m_serviceState = SERVICE_RUNNING;
m_serviceState->broadcast();
return;
case SERVICE_CONTROL_STOP:
case SERVICE_CONTROL_SHUTDOWN:
// update state
*m_serviceState = SERVICE_STOP_PENDING;
setStatus(m_statusHandle, *m_serviceState, 0, 1000);
// stop run callback if running and wait for it to finish
if (m_serviceRunning) {
m_serviceHandlerWaiting = true;
m_stop();
m_serviceState->wait();
}
// update state
*m_serviceState = SERVICE_STOPPED;
m_serviceState->broadcast();
break;
default:
log((CLOG_WARN "unknown service command: %d", ctrl));
// fall through
case SERVICE_CONTROL_INTERROGATE:
break;
}
// send update
setStatus(m_statusHandle, *m_serviceState);
}
void WINAPI
CWin32Platform::serviceHandlerEntry(
DWORD ctrl)
{
s_daemonPlatform->serviceHandler(ctrl);
}
bool
CWin32Platform::serviceLogger(
int priority,
const char* msg)
{
if (s_eventLog == NULL) {
return false;
}
// convert priority
WORD type;
switch (priority) {
case CLog::kFATAL:
case CLog::kERROR:
type = EVENTLOG_ERROR_TYPE;
break;
case CLog::kWARNING:
type = EVENTLOG_WARNING_TYPE;
break;
default:
type = EVENTLOG_INFORMATION_TYPE;
break;
}
// log it
// FIXME -- win32 wants to use a message table to look up event
// strings. log messages aren't organized that way so we'll
// just dump our string into the raw data section of the event
// so users can at least see the message. note that we use our
// priority as the event category.
ReportEvent(s_eventLog, type, static_cast<WORD>(priority),
0, // event ID
NULL,
0,
strlen(msg + 1), // raw data size
NULL,
const_cast<char*>(msg));// raw data
return true;
}