CLAMAPI void Scan_ReloadDatabase(BOOL bLoadMinDefs) {
if(InterlockedIncrement(&reload_waiters)==1) {
int reload_ok = 0;
logg("*Scan_ReloadDatabase: Database reload requested received, waiting for idle state\n");
while(1) {
unsigned int i;
struct cl_settings *settings;
if(WaitForSingleObject(reload_event, INFINITE) == WAIT_FAILED) {
logg("!Scan_ReloadDatabase: failed to wait on reload event\n");
continue;
}
logg("*Scan_ReloadDatabase: Now idle, acquiring engine lock\n");
if(lock_engine()) {
logg("!Scan_ReloadDatabase: failed to lock engine\n");
break;
}
if(!engine) {
logg("!Scan_ReloadDatabase: engine is NULL\n");
unlock_engine();
break;
}
logg("*Scan_ReloadDatabase: Engine locked, acquiring instance lock\n");
if(lock_instances()) {
logg("!Scan_ReloadDatabase: failed to lock instances\n");
unlock_engine();
break;
}
for(i=0; i<ninsts_total; i++) {
if(instances[i].inst && instances[i].refcnt)
break;
}
if(i!=ninsts_total) {
logg("Scan_ScanObjectByHandle: some instances are still in use\n");
ResetEvent(reload_event);
unlock_instances();
unlock_engine();
continue;
}
settings = cl_engine_settings_copy(engine);
if (!settings) {
logg("!Scan_ReloadDatabase: Not enough memory for engine settings\n");
unlock_instances();
unlock_engine();
break;
}
logg("Scan_ReloadDatabase: Destroying old engine\n");
cl_engine_free(engine);
minimal_definitions = bLoadMinDefs;
logg("Scan_ReloadDatabase: Loading new engine\n");
// NEW STUFF //
if(!(engine = cl_engine_new())) {
logg("!Scan_ReloadDatabase: Not enough memory for a new engine\n");
unlock_instances();
unlock_engine();
break;
}
cl_engine_settings_apply(engine, settings);
cl_engine_settings_free(settings);
load_db(); /* FIXME: FIAL? */
unlock_instances();
unlock_engine();
reload_ok = 1;
break;
}
if(reload_ok)
logg("Scan_ReloadDatabase: Database successfully reloaded\n");
else
logg("!Scan_ReloadDatabase: Database reload failed\n");
} else
logg("*Database reload requested received while reload is pending\n");
InterlockedDecrement(&reload_waiters);
}
static struct cl_engine *reload_db(struct cl_engine *engine, unsigned int dboptions, const struct optstruct *opts, int do_check, int *ret)
{
const char *dbdir;
int retval;
unsigned int sigs = 0;
struct cl_settings *settings = NULL;
*ret = 0;
if(do_check) {
if(!dbstat.entries) {
logg("No stats for Database check - forcing reload\n");
return engine;
}
if(cl_statchkdir(&dbstat) == 1) {
logg("SelfCheck: Database modification detected. Forcing reload.\n");
return engine;
} else {
logg("SelfCheck: Database status OK.\n");
return NULL;
}
}
/* release old structure */
if(engine) {
/* copy current settings */
settings = cl_engine_settings_copy(engine);
if(!settings)
logg("^Can't make a copy of the current engine settings\n");
thrmgr_setactiveengine(NULL);
cl_engine_free(engine);
}
dbdir = optget(opts, "DatabaseDirectory")->strarg;
logg("Reading databases from %s\n", dbdir);
if(dbstat.entries)
cl_statfree(&dbstat);
memset(&dbstat, 0, sizeof(struct cl_stat));
if((retval = cl_statinidir(dbdir, &dbstat))) {
logg("!cl_statinidir() failed: %s\n", cl_strerror(retval));
*ret = 1;
if(settings)
cl_engine_settings_free(settings);
return NULL;
}
if(!(engine = cl_engine_new())) {
logg("!Can't initialize antivirus engine\n");
*ret = 1;
if(settings)
cl_engine_settings_free(settings);
return NULL;
}
if(settings) {
retval = cl_engine_settings_apply(engine, settings);
if(retval != CL_SUCCESS) {
logg("^Can't apply previous engine settings: %s\n", cl_strerror(retval));
logg("^Using default engine settings\n");
}
cl_engine_settings_free(settings);
}
if((retval = cl_load(dbdir, engine, &sigs, dboptions))) {
logg("!reload db failed: %s\n", cl_strerror(retval));
cl_engine_free(engine);
*ret = 1;
return NULL;
}
if((retval = cl_engine_compile(engine)) != 0) {
logg("!Database initialization error: can't compile engine: %s\n", cl_strerror(retval));
cl_engine_free(engine);
*ret = 1;
return NULL;
}
logg("Database correctly reloaded (%u signatures)\n", sigs);
thrmgr_setactiveengine(engine);
return engine;
}