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// SPDX-License-Identifier: GPL-3.0-or-later
#include "perflib.h"
#if defined(OS_WINDOWS)
#define REGISTRY_KEY "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib\\009"
typedef struct perflib_registry {
DWORD id;
char *key;
char *help;
} perfLibRegistryEntry;
static inline bool compare_perfLibRegistryEntry(const char *k1, const char *k2) {
return strcmp(k1, k2) == 0;
}
static inline const char *value2key_perfLibRegistryEntry(perfLibRegistryEntry *entry) {
return entry->key;
}
#define SIMPLE_HASHTABLE_COMPARE_KEYS_FUNCTION compare_perfLibRegistryEntry
#define SIMPLE_HASHTABLE_VALUE2KEY_FUNCTION value2key_perfLibRegistryEntry
#define SIMPLE_HASHTABLE_KEY_TYPE const char
#define SIMPLE_HASHTABLE_VALUE_TYPE perfLibRegistryEntry
#define SIMPLE_HASHTABLE_NAME _PERFLIB
#include "libnetdata/simple_hashtable/simple_hashtable.h"
static struct {
SPINLOCK spinlock;
size_t size;
perfLibRegistryEntry **array;
struct simple_hashtable_PERFLIB hashtable;
FILETIME lastWriteTime;
} names_globals = {
.spinlock = NETDATA_SPINLOCK_INITIALIZER,
.size = 0,
.array = NULL,
};
DWORD RegistryFindIDByName(const char *name) {
DWORD rc = PERFLIB_REGISTRY_NAME_NOT_FOUND;
spinlock_lock(&names_globals.spinlock);
XXH64_hash_t hash = XXH3_64bits((void *)name, strlen(name));
SIMPLE_HASHTABLE_SLOT_PERFLIB *sl = simple_hashtable_get_slot_PERFLIB(&names_globals.hashtable, hash, name, false);
perfLibRegistryEntry *e = SIMPLE_HASHTABLE_SLOT_DATA(sl);
if(e) rc = e->id;
spinlock_unlock(&names_globals.spinlock);
return rc;
}
static inline void RegistryAddToHashTable_unsafe(perfLibRegistryEntry *entry) {
XXH64_hash_t hash = XXH3_64bits((void *)entry->key, strlen(entry->key));
SIMPLE_HASHTABLE_SLOT_PERFLIB *sl = simple_hashtable_get_slot_PERFLIB(&names_globals.hashtable, hash, entry->key, true);
perfLibRegistryEntry *e = SIMPLE_HASHTABLE_SLOT_DATA(sl);
if(!e || e->id > entry->id)
simple_hashtable_set_slot_PERFLIB(&names_globals.hashtable, sl, hash, entry);
}
static void RegistrySetData_unsafe(DWORD id, const char *key, const char *help) {
if(id >= names_globals.size) {
// increase the size of the array
size_t old_size = names_globals.size;
if(!names_globals.size)
names_globals.size = 20000;
else
names_globals.size *= 2;
names_globals.array = reallocz(names_globals.array, names_globals.size * sizeof(perfLibRegistryEntry *));
memset(names_globals.array + old_size, 0, (names_globals.size - old_size) * sizeof(perfLibRegistryEntry *));
}
perfLibRegistryEntry *entry = names_globals.array[id];
if(!entry)
entry = names_globals.array[id] = (perfLibRegistryEntry *)calloc(1, sizeof(perfLibRegistryEntry));
bool add_to_hash = false;
if(key && !entry->key) {
entry->key = strdup(key);
add_to_hash = true;
}
if(help && !entry->help)
entry->help = strdup(help);
entry->id = id;
if(add_to_hash)
RegistryAddToHashTable_unsafe(entry);
}
const char *RegistryFindNameByID(DWORD id) {
const char *s = "";
spinlock_lock(&names_globals.spinlock);
if(id < names_globals.size) {
perfLibRegistryEntry *titleEntry = names_globals.array[id];
if(titleEntry && titleEntry->key)
s = titleEntry->key;
}
spinlock_unlock(&names_globals.spinlock);
return s;
}
const char *RegistryFindHelpByID(DWORD id) {
const char *s = "";
spinlock_lock(&names_globals.spinlock);
if(id < names_globals.size) {
perfLibRegistryEntry *titleEntry = names_globals.array[id];
if(titleEntry && titleEntry->help)
s = titleEntry->help;
}
spinlock_unlock(&names_globals.spinlock);
return s;
}
// ----------------------------------------------------------
static inline void readRegistryKeys_unsafe(BOOL helps) {
TCHAR *pData = NULL;
HKEY hKey;
DWORD dwType;
DWORD dwSize = 0;
LONG lStatus;
LPCSTR valueName;
if(helps)
valueName = TEXT("help");
else
valueName = TEXT("CounterDefinition");
// Open the key for the English counters
lStatus = RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT(REGISTRY_KEY), 0, KEY_READ, &hKey);
if (lStatus != ERROR_SUCCESS) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"Failed to open registry key HKEY_LOCAL_MACHINE, subkey '%s', error %ld\n", REGISTRY_KEY, (long)lStatus);
return;
}
// Get the size of the 'Counters' data
lStatus = RegQueryValueEx(hKey, valueName, NULL, &dwType, NULL, &dwSize);
if (lStatus != ERROR_SUCCESS) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"Failed to get registry key HKEY_LOCAL_MACHINE, subkey '%s', value '%s', size of data, error %ld\n",
REGISTRY_KEY, (const char *)valueName, (long)lStatus);
goto cleanup;
}
// Allocate memory for the data
pData = mallocz(dwSize);
// Read the 'Counters' data
lStatus = RegQueryValueEx(hKey, valueName, NULL, &dwType, (LPBYTE)pData, &dwSize);
if (lStatus != ERROR_SUCCESS || dwType != REG_MULTI_SZ) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"Failed to get registry key HKEY_LOCAL_MACHINE, subkey '%s', value '%s', data, error %ld\n",
REGISTRY_KEY, (const char *)valueName, (long)lStatus);
goto cleanup;
}
// Process the counter data
TCHAR *ptr = pData;
while (*ptr) {
TCHAR *sid = ptr; // First string is the ID
ptr += lstrlen(ptr) + 1; // Move to the next string
TCHAR *name = ptr; // Second string is the name
ptr += lstrlen(ptr) + 1; // Move to the next pair
DWORD id = strtoul(sid, NULL, 10);
if(helps)
RegistrySetData_unsafe(id, NULL, name);
else
RegistrySetData_unsafe(id, name, NULL);
}
cleanup:
if(pData) freez(pData);
RegCloseKey(hKey);
}
static BOOL RegistryKeyModification(FILETIME *lastWriteTime) {
HKEY hKey;
LONG lResult;
BOOL ret = FALSE;
// Open the registry key
lResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT(REGISTRY_KEY), 0, KEY_READ, &hKey);
if (lResult != ERROR_SUCCESS) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"Failed to open registry key HKEY_LOCAL_MACHINE, subkey '%s', error %ld\n", REGISTRY_KEY, (long)lResult);
return FALSE;
}
// Get the last write time
lResult = RegQueryInfoKey(hKey, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, lastWriteTime);
if (lResult != ERROR_SUCCESS) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"Failed to query registry key HKEY_LOCAL_MACHINE, subkey '%s', last write time, error %ld\n", REGISTRY_KEY, (long)lResult);
ret = FALSE;
}
else
ret = TRUE;
RegCloseKey(hKey);
return ret;
}
static inline void RegistryFetchAll_unsafe(void) {
readRegistryKeys_unsafe(FALSE);
readRegistryKeys_unsafe(TRUE);
}
void PerflibNamesRegistryInitialize(void) {
spinlock_lock(&names_globals.spinlock);
simple_hashtable_init_PERFLIB(&names_globals.hashtable, 20000);
RegistryKeyModification(&names_globals.lastWriteTime);
RegistryFetchAll_unsafe();
spinlock_unlock(&names_globals.spinlock);
}
void PerflibNamesRegistryUpdate(void) {
FILETIME lastWriteTime = { 0 };
RegistryKeyModification(&lastWriteTime);
if(CompareFileTime(&lastWriteTime, &names_globals.lastWriteTime) > 0) {
spinlock_lock(&names_globals.spinlock);
if(CompareFileTime(&lastWriteTime, &names_globals.lastWriteTime) > 0) {
names_globals.lastWriteTime = lastWriteTime;
RegistryFetchAll_unsafe();
}
spinlock_unlock(&names_globals.spinlock);
}
}
#endif // OS_WINDOWS
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