/*
** Attempt to load an SQLite extension library contained in the file
** zFile. The entry point is zProc. zProc may be 0 in which case a
** default entry point name (sqlite3_extension_init) is used. Use
** of the default name is recommended.
**
** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong.
**
** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with
** error message text. The calling function should free this memory
** by calling sqlite3DbFree(db, ).
*/
static int sqlite3LoadExtension(
sqlite3 *db, /* Load the extension into this database connection */
const char *zFile, /* Name of the shared library containing extension */
const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */
char **pzErrMsg /* Put error message here if not 0 */
){
sqlite3_vfs *pVfs = db->pVfs;
void *handle;
int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*);
char *zErrmsg = 0;
const char *zEntry;
char *zAltEntry = 0;
void **aHandle;
u64 nMsg = 300 + sqlite3Strlen30(zFile);
int ii;
int rc;
/* Shared library endings to try if zFile cannot be loaded as written */
static const char *azEndings[] = {
#if SQLITE_OS_WIN
"dll"
#elif defined(__APPLE__)
"dylib"
#else
"so"
#endif
};
if( pzErrMsg ) *pzErrMsg = 0;
/* Ticket #1863. To avoid a creating security problems for older
** applications that relink against newer versions of SQLite, the
** ability to run load_extension is turned off by default. One
** must call either sqlite3_enable_load_extension(db) or
** sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, 1, 0)
** to turn on extension loading.
*/
if( (db->flags & SQLITE_LoadExtension)==0 ){
if( pzErrMsg ){
*pzErrMsg = sqlite3_mprintf("not authorized");
}
return SQLITE_ERROR;
}
zEntry = zProc ? zProc : "sqlite3_extension_init";
handle = sqlite3OsDlOpen(pVfs, zFile);
#if SQLITE_OS_UNIX || SQLITE_OS_WIN
for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){
char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]);
if( zAltFile==0 ) return SQLITE_NOMEM_BKPT;
handle = sqlite3OsDlOpen(pVfs, zAltFile);
sqlite3_free(zAltFile);
}
#endif
if( handle==0 ){
if( pzErrMsg ){
*pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);
if( zErrmsg ){
sqlite3_snprintf(nMsg, zErrmsg,
"unable to open shared library [%s]", zFile);
sqlite3OsDlError(pVfs, nMsg-1, zErrmsg);
}
}
return SQLITE_ERROR;
}
xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*))
sqlite3OsDlSym(pVfs, handle, zEntry);
/* If no entry point was specified and the default legacy
** entry point name "sqlite3_extension_init" was not found, then
** construct an entry point name "sqlite3_X_init" where the X is
** replaced by the lowercase value of every ASCII alphabetic
** character in the filename after the last "/" upto the first ".",
** and eliding the first three characters if they are "lib".
** Examples:
**
** /usr/local/lib/libExample5.4.3.so ==> sqlite3_example_init
** C:/lib/mathfuncs.dll ==> sqlite3_mathfuncs_init
*/
if( xInit==0 && zProc==0 ){
int iFile, iEntry, c;
int ncFile = sqlite3Strlen30(zFile);
zAltEntry = sqlite3_malloc64(ncFile+30);
if( zAltEntry==0 ){
sqlite3OsDlClose(pVfs, handle);
return SQLITE_NOMEM_BKPT;
}
memcpy(zAltEntry, "sqlite3_", 8);
for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){}
iFile++;
if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3;
for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){
if( sqlite3Isalpha(c) ){
zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c];
}
}
memcpy(zAltEntry+iEntry, "_init", 6);
zEntry = zAltEntry;
xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*))
sqlite3OsDlSym(pVfs, handle, zEntry);
}
if( xInit==0 ){
if( pzErrMsg ){
nMsg += sqlite3Strlen30(zEntry);
*pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);
if( zErrmsg ){
sqlite3_snprintf(nMsg, zErrmsg,
"no entry point [%s] in shared library [%s]", zEntry, zFile);
sqlite3OsDlError(pVfs, nMsg-1, zErrmsg);
}
}
sqlite3OsDlClose(pVfs, handle);
sqlite3_free(zAltEntry);
return SQLITE_ERROR;
}
sqlite3_free(zAltEntry);
rc = xInit(db, &zErrmsg, &sqlite3Apis);
if( rc ){
if( rc==SQLITE_OK_LOAD_PERMANENTLY ) return SQLITE_OK;
if( pzErrMsg ){
*pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg);
}
sqlite3_free(zErrmsg);
sqlite3OsDlClose(pVfs, handle);
return SQLITE_ERROR;
}
/* Append the new shared library handle to the db->aExtension array. */
aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1));
if( aHandle==0 ){
return SQLITE_NOMEM_BKPT;
}
if( db->nExtension>0 ){
memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension);
}
sqlite3DbFree(db, db->aExtension);
db->aExtension = aHandle;
db->aExtension[db->nExtension++] = handle;
return SQLITE_OK;
}
/*
** Close the dynamic library handle pHandle.
*/
static void tvfsDlClose(sqlite3_vfs *pVfs, void *pHandle){
sqlite3OsDlClose(PARENTVFS(pVfs), pHandle);
}
static void devsymDlClose(sqlite3_vfs *pVfs, void *pHandle){
sqlite3OsDlClose(g.pVfs, pHandle);
}
/*
** Attempt to load an SQLite extension library contained in the file
** zFile. The entry point is zProc. zProc may be 0 in which case a
** default entry point name (sqlite3_extension_init) is used. Use
** of the default name is recommended.
**
** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong.
**
** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with
** error message text. The calling function should free this memory
** by calling sqlite3DbFree(db, ).
*/
static int sqlite3LoadExtension(
sqlite3 *db, /* Load the extension into this database connection */
const char *zFile, /* Name of the shared library containing extension */
const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */
char **pzErrMsg /* Put error message here if not 0 */
){
sqlite3_vfs *pVfs = db->pVfs;
void *handle;
int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*);
char *zErrmsg = 0;
void **aHandle;
/* Ticket #1863. To avoid a creating security problems for older
** applications that relink against newer versions of SQLite, the
** ability to run load_extension is turned off by default. One
** must call sqlite3_enable_load_extension() to turn on extension
** loading. Otherwise you get the following error.
*/
if( (db->flags & SQLITE_LoadExtension)==0 ){
if( pzErrMsg ){
*pzErrMsg = sqlite3_mprintf("not authorized");
}
return SQLITE_ERROR;
}
if( zProc==0 ){
zProc = "sqlite3_extension_init";
}
handle = sqlite3OsDlOpen(pVfs, zFile);
if( handle==0 ){
if( pzErrMsg ){
char zErr[256];
zErr[sizeof(zErr)-1] = '\0';
sqlite3_snprintf(sizeof(zErr)-1, zErr,
"unable to open shared library [%s]", zFile);
sqlite3OsDlError(pVfs, sizeof(zErr)-1, zErr);
*pzErrMsg = sqlite3DbStrDup(0, zErr);
}
return SQLITE_ERROR;
}
xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*))
sqlite3OsDlSym(pVfs, handle, zProc);
if( xInit==0 ){
if( pzErrMsg ){
char zErr[256];
zErr[sizeof(zErr)-1] = '\0';
sqlite3_snprintf(sizeof(zErr)-1, zErr,
"no entry point [%s] in shared library [%s]", zProc,zFile);
sqlite3OsDlError(pVfs, sizeof(zErr)-1, zErr);
*pzErrMsg = sqlite3DbStrDup(0, zErr);
sqlite3OsDlClose(pVfs, handle);
}
return SQLITE_ERROR;
}else if( xInit(db, &zErrmsg, &sqlite3Apis) ){
if( pzErrMsg ){
*pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg);
}
sqlite3_free(zErrmsg);
sqlite3OsDlClose(pVfs, handle);
return SQLITE_ERROR;
}
/* Append the new shared library handle to the db->aExtension array. */
aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1));
if( aHandle==0 ){
return SQLITE_NOMEM;
}
if( db->nExtension>0 ){
memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension);
}
sqlite3DbFree(db, db->aExtension);
db->aExtension = aHandle;
db->aExtension[db->nExtension++] = handle;
return SQLITE_OK;
}
