/**
* \param[in] argc argument count
* \param[in] argv argument array
* \return 0 on success, 1 on error
*
* \attention In daemon mode, it finishes immediately.
*/
int main(int argc, char** argv)
{
openlog(INCRON_DAEMON_NAME, INCRON_LOG_OPTS, INCRON_LOG_FACIL);
syslog(LOG_NOTICE, "starting service (version %s, built on %s %s)", INCRON_VERSION, __DATE__, __TIME__);
try {
Inotify in;
in.SetNonBlock(true);
EventDispatcher ed(&in);
try {
load_tables(&in, &ed);
} catch (InotifyException e) {
int err = e.GetErrorNumber();
syslog(LOG_CRIT, "%s: (%i) %s", e.GetMessage().c_str(), err, strerror(err));
syslog(LOG_NOTICE, "stopping service");
closelog();
return 1;
}
signal(SIGTERM, on_signal);
signal(SIGINT, on_signal);
signal(SIGCHLD, on_signal);
if (DAEMON)
daemon(0, 0);
uint32_t wm = IN_CLOSE_WRITE | IN_DELETE | IN_MOVE | IN_DELETE_SELF | IN_UNMOUNT;
InotifyWatch watch(INCRON_TABLE_BASE, wm);
in.Add(watch);
syslog(LOG_NOTICE, "ready to process filesystem events");
InotifyEvent e;
struct pollfd pfd;
pfd.fd = in.GetDescriptor();
pfd.events = (short) POLLIN;
pfd.revents = (short) 0;
while (!g_fFinish) {
int res = poll(&pfd, 1, -1);
if (res > 0) {
in.WaitForEvents(true);
}
else if (res < 0) {
if (errno != EINTR)
throw InotifyException("polling failed", errno, NULL);
}
UserTable::FinishDone();
while (in.GetEvent(e)) {
if (e.GetWatch() == &watch) {
if (e.IsType(IN_DELETE_SELF) || e.IsType(IN_UNMOUNT)) {
syslog(LOG_CRIT, "base directory destroyed, exitting");
g_fFinish = true;
}
else if (!e.GetName().empty()) {
SUT_MAP::iterator it = g_ut.find(e.GetName());
if (it != g_ut.end()) {
UserTable* pUt = (*it).second;
if (e.IsType(IN_CLOSE_WRITE) || e.IsType(IN_MOVED_TO)) {
syslog(LOG_INFO, "table for user %s changed, reloading", e.GetName().c_str());
pUt->Dispose();
pUt->Load();
}
else if (e.IsType(IN_MOVED_FROM) || e.IsType(IN_DELETE)) {
syslog(LOG_INFO, "table for user %s destroyed, removing", e.GetName().c_str());
delete pUt;
g_ut.erase(it);
}
}
else if (e.IsType(IN_CLOSE_WRITE) || e.IsType(IN_MOVED_TO)) {
if (check_user(e.GetName().c_str())) {
syslog(LOG_INFO, "table for user %s created, loading", e.GetName().c_str());
UserTable* pUt = new UserTable(&in, &ed, e.GetName());
g_ut.insert(SUT_MAP::value_type(e.GetName(), pUt));
pUt->Load();
}
}
}
}
else {
ed.DispatchEvent(e);
}
}
}
} catch (InotifyException e) {
int err = e.GetErrorNumber();
syslog(LOG_CRIT, "*** unhandled exception occurred ***");
syslog(LOG_CRIT, " %s", e.GetMessage().c_str());
syslog(LOG_CRIT, " error: (%i) %s", err, strerror(err));
}
syslog(LOG_NOTICE, "stopping service");
closelog();
return 0;
}
/**
* \param[in] argc argument count
* \param[in] argv argument array
* \return 0 on success, 1 on error
*
* \attention In daemon mode, it finishes immediately.
*/
int main(int argc, char** argv)
{
AppArgs::Init();
if (!( AppArgs::AddOption("about", '?', AAT_NO_VALUE, false)
&& AppArgs::AddOption("help", 'h', AAT_NO_VALUE, false)
&& AppArgs::AddOption("foreground", 'n', AAT_NO_VALUE, false)
&& AppArgs::AddOption("kill", 'k', AAT_NO_VALUE, false)
&& AppArgs::AddOption("config", 'f', AAT_MANDATORY_VALUE, false)
&& AppArgs::AddOption("version", 'V', AAT_NO_VALUE, false)))
{
fprintf(stderr, "error while initializing application");
return 1;
}
AppArgs::Parse(argc, argv);
if (AppArgs::ExistsOption("help")) {
fprintf(stderr, "%s\n", INCROND_HELP);
return 0;
}
if (AppArgs::ExistsOption("about")) {
fprintf(stderr, "%s\n", INCROND_DESCRIPTION);
return 0;
}
if (AppArgs::ExistsOption("version")) {
fprintf(stderr, "%s\n", INCROND_VERSION);
return 0;
}
IncronCfg::Init();
std::string cfg;
if (!AppArgs::GetOption("config", cfg))
cfg = INCRON_CONFIG;
IncronCfg::Load(cfg);
std::string lckdir;
IncronCfg::GetValue("lockfile_dir", lckdir);
std::string lckfile;
IncronCfg::GetValue("lockfile_name", lckfile);
AppInstance app(lckfile, lckdir);
if (AppArgs::ExistsOption("kill")) {
fprintf(stderr, "attempting to terminate a running instance of incrond...\n");
if (app.Terminate()) {
fprintf(stderr, "the instance notified, going down\n");
return 0;
}
else {
fprintf(stderr, "error - incrond probably not running\n");
return 1;
}
}
if (AppArgs::ExistsOption("foreground"))
g_daemon = false;
openlog(INCROND_NAME, INCRON_LOG_OPTS, INCRON_LOG_FACIL);
syslog(LOG_NOTICE, "starting service (version %s, built on %s %s)", INCRON_VERSION, __DATE__, __TIME__);
AppArgs::Destroy();
int ret = 0;
std::string sysBase;
std::string userBase;
if (!IncronCfg::GetValue("system_table_dir", sysBase))
throw InotifyException("configuration is corrupted", EINVAL);
if (access(sysBase.c_str(), R_OK) != 0) {
syslog(LOG_CRIT, "cannot read directory for system tables (%s): (%i) %s", sysBase.c_str(), errno, strerror(errno));
if (!g_daemon)
fprintf(stderr, "cannot read directory for system tables (%s): (%i) %s", sysBase.c_str(), errno, strerror(errno));
ret = 1;
goto error;
}
if (!IncronCfg::GetValue("user_table_dir", userBase))
throw InotifyException("configuration is corrupted", EINVAL);
if (access(userBase.c_str(), R_OK) != 0) {
syslog(LOG_CRIT, "cannot read directory for user tables (%s): (%i) %s", userBase.c_str(), errno, strerror(errno));
if (!g_daemon)
fprintf(stderr, "cannot read directory for user tables (%s): (%i) %s", userBase.c_str(), errno, strerror(errno));
ret = 1;
goto error;
}
try {
if (g_daemon)
if (daemon(0, 0) == -1) {
syslog(LOG_CRIT, "daemonizing failed: (%i) %s", errno, strerror(errno));
fprintf(stderr, "daemonizing failed: (%i) %s\n", errno, strerror(errno));
ret = 1;
goto error;
}
try {
if (!app.Lock()) {
syslog(LOG_CRIT, "another instance of incrond already running");
if (!g_daemon)
fprintf(stderr, "another instance of incrond already running\n");
ret = 1;
goto error;
}
} catch (AppInstException e) {
syslog(LOG_CRIT, "instance lookup failed: (%i) %s", e.GetErrorNumber(), strerror(e.GetErrorNumber()));
if (!g_daemon)
fprintf(stderr, "instance lookup failed: (%i) %s\n", e.GetErrorNumber(), strerror(e.GetErrorNumber()));
ret = 1;
goto error;
}
prepare_pipe();
Inotify in;
in.SetNonBlock(true);
in.SetCloseOnExec(true);
uint32_t wm = IN_CREATE | IN_CLOSE_WRITE | IN_DELETE | IN_MOVE | IN_DELETE_SELF | IN_UNMOUNT;
InotifyWatch stw(sysBase, wm);
in.Add(stw);
InotifyWatch utw(userBase, wm);
in.Add(utw);
EventDispatcher ed(g_cldPipe[0], &in, &stw, &utw);
try {
load_tables(&ed);
} catch (InotifyException e) {
int err = e.GetErrorNumber();
syslog(LOG_CRIT, "%s: (%i) %s", e.GetMessage().c_str(), err, strerror(err));
ret = 1;
goto error;
}
ed.Rebuild(); // not too efficient, but simple
signal(SIGTERM, on_signal);
signal(SIGINT, on_signal);
signal(SIGCHLD, on_signal);
syslog(LOG_NOTICE, "ready to process filesystem events");
while (!g_fFinish) {
int res = poll(ed.GetPollData(), ed.GetSize(), -1);
if (res > 0) {
if (ed.ProcessEvents())
UserTable::FinishDone();
}
else if (res < 0) {
switch (errno) {
case EINTR: // syscall interrupted - continue polling
break;
case EAGAIN: // not enough resources - wait a moment and try again
syslog(LOG_WARNING, "polling failed due to resource shortage, retrying later...");
sleep(POLL_EAGAIN_WAIT);
break;
default:
throw InotifyException("polling failed", errno, NULL);
}
}
}
free_tables(&ed);
if (g_cldPipe[0] != -1)
close(g_cldPipe[0]);
if (g_cldPipe[1] != -1)
close(g_cldPipe[1]);
} catch (InotifyException e) {
int err = e.GetErrorNumber();
syslog(LOG_CRIT, "*** unhandled exception occurred ***");
syslog(LOG_CRIT, " %s", e.GetMessage().c_str());
syslog(LOG_CRIT, " error: (%i) %s", err, strerror(err));
ret = 1;
}
error:
syslog(LOG_NOTICE, "stopping service");
closelog();
return ret;
}