sqlcipher/src/loadext.c at sqlite-release · sqlcipher/sqlcipher · GitHub

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** 2006 June 7

** The author disclaims copyright to this source code. In place of

** a legal notice, here is a blessing:

** May you do good and not evil.

** May you find forgiveness for yourself and forgive others.

** May you share freely, never taking more than you give.

*************************************************************************

** This file contains code used to dynamically load extensions into

** the SQLite library.

#ifndef SQLITE_CORE

#define SQLITE_CORE 1 /* Disable the API redefinition in sqlite3ext.h */

#endif

#include "sqlite3ext.h"

#include "sqliteInt.h"

#ifndef SQLITE_OMIT_LOAD_EXTENSION

** Some API routines are omitted when various features are

** excluded from a build of SQLite. Substitute a NULL pointer

** for any missing APIs.

#ifndef SQLITE_ENABLE_COLUMN_METADATA

# define sqlite3_column_database_name 0

# define sqlite3_column_database_name16 0

# define sqlite3_column_table_name 0

# define sqlite3_column_table_name16 0

# define sqlite3_column_origin_name 0

# define sqlite3_column_origin_name16 0

#endif

#ifdef SQLITE_OMIT_AUTHORIZATION

# define sqlite3_set_authorizer 0

#endif

#ifdef SQLITE_OMIT_UTF16

# define sqlite3_bind_text16 0

# define sqlite3_collation_needed16 0

# define sqlite3_column_decltype16 0

# define sqlite3_column_name16 0

# define sqlite3_column_text16 0

# define sqlite3_complete16 0

# define sqlite3_create_collation16 0

# define sqlite3_create_function16 0

# define sqlite3_errmsg16 0

# define sqlite3_open16 0

# define sqlite3_prepare16 0

# define sqlite3_prepare16_v2 0

# define sqlite3_prepare16_v3 0

# define sqlite3_result_error16 0

# define sqlite3_result_text16 0

# define sqlite3_result_text16be 0

# define sqlite3_result_text16le 0

# define sqlite3_value_text16 0

# define sqlite3_value_text16be 0

# define sqlite3_value_text16le 0

# define sqlite3_column_database_name16 0

# define sqlite3_column_table_name16 0

# define sqlite3_column_origin_name16 0

#endif

#ifdef SQLITE_OMIT_COMPLETE

# define sqlite3_complete 0

# define sqlite3_complete16 0

#endif

#ifdef SQLITE_OMIT_DECLTYPE

# define sqlite3_column_decltype16 0

# define sqlite3_column_decltype 0

#endif

#ifdef SQLITE_OMIT_PROGRESS_CALLBACK

# define sqlite3_progress_handler 0

#endif

#ifdef SQLITE_OMIT_VIRTUALTABLE

# define sqlite3_create_module 0

# define sqlite3_create_module_v2 0

# define sqlite3_declare_vtab 0

# define sqlite3_vtab_config 0

# define sqlite3_vtab_on_conflict 0

# define sqlite3_vtab_collation 0

#endif

#ifdef SQLITE_OMIT_SHARED_CACHE

# define sqlite3_enable_shared_cache 0

#endif

#if defined(SQLITE_OMIT_TRACE) || defined(SQLITE_OMIT_DEPRECATED)

# define sqlite3_profile 0

# define sqlite3_trace 0

#endif

#ifdef SQLITE_OMIT_GET_TABLE

# define sqlite3_free_table 0

# define sqlite3_get_table 0

#endif

#ifdef SQLITE_OMIT_INCRBLOB

#define sqlite3_bind_zeroblob 0

#define sqlite3_blob_bytes 0

#define sqlite3_blob_close 0

#define sqlite3_blob_open 0

#define sqlite3_blob_read 0

#define sqlite3_blob_write 0

#define sqlite3_blob_reopen 0

#endif

#if defined(SQLITE_OMIT_TRACE)

# define sqlite3_trace_v2 0

#endif

** The following structure contains pointers to all SQLite API routines.

** A pointer to this structure is passed into extensions when they are

** loaded so that the extension can make calls back into the SQLite

** library.

** When adding new APIs, add them to the bottom of this structure

** in order to preserve backwards compatibility.

** Extensions that use newer APIs should first call the

** sqlite3_libversion_number() to make sure that the API they

** intend to use is supported by the library. Extensions should

** also check to make sure that the pointer to the function is

** not NULL before calling it.

static const sqlite3_api_routines sqlite3Apis = {

sqlite3_aggregate_context,

#ifndef SQLITE_OMIT_DEPRECATED

sqlite3_aggregate_count,

#else

#endif

sqlite3_bind_blob,

sqlite3_bind_double,

sqlite3_bind_int,

sqlite3_bind_int64,

sqlite3_bind_null,

sqlite3_bind_parameter_count,

sqlite3_bind_parameter_index,

sqlite3_bind_parameter_name,

sqlite3_bind_text,

sqlite3_bind_text16,

sqlite3_bind_value,

sqlite3_busy_handler,

sqlite3_busy_timeout,

sqlite3_changes,

sqlite3_close,

sqlite3_collation_needed,

sqlite3_collation_needed16,

sqlite3_column_blob,

sqlite3_column_bytes,

sqlite3_column_bytes16,

sqlite3_column_count,

sqlite3_column_database_name,

sqlite3_column_database_name16,

sqlite3_column_decltype,

sqlite3_column_decltype16,

sqlite3_column_double,

sqlite3_column_int,

sqlite3_column_int64,

sqlite3_column_name,

sqlite3_column_name16,

sqlite3_column_origin_name,

sqlite3_column_origin_name16,

sqlite3_column_table_name,

sqlite3_column_table_name16,

sqlite3_column_text,

sqlite3_column_text16,

sqlite3_column_type,

sqlite3_column_value,

sqlite3_commit_hook,

sqlite3_complete,

sqlite3_complete16,

sqlite3_create_collation,

sqlite3_create_collation16,

sqlite3_create_function,

sqlite3_create_function16,

sqlite3_create_module,

sqlite3_data_count,

sqlite3_db_handle,

sqlite3_declare_vtab,

sqlite3_enable_shared_cache,

sqlite3_errcode,

sqlite3_errmsg,

sqlite3_errmsg16,

sqlite3_exec,

#ifndef SQLITE_OMIT_DEPRECATED

sqlite3_expired,

#else

#endif

sqlite3_finalize,

sqlite3_free,

sqlite3_free_table,

sqlite3_get_autocommit,

sqlite3_get_auxdata,

sqlite3_get_table,

0, /* Was sqlite3_global_recover(), but that function is deprecated */

sqlite3_interrupt,

sqlite3_last_insert_rowid,

sqlite3_libversion,

sqlite3_libversion_number,

sqlite3_malloc,

sqlite3_mprintf,

sqlite3_open,

sqlite3_open16,

sqlite3_prepare,

sqlite3_prepare16,

sqlite3_profile,

sqlite3_progress_handler,

sqlite3_realloc,

sqlite3_reset,

sqlite3_result_blob,

sqlite3_result_double,

sqlite3_result_error,

sqlite3_result_error16,

sqlite3_result_int,

sqlite3_result_int64,

sqlite3_result_null,

sqlite3_result_text,

sqlite3_result_text16,

sqlite3_result_text16be,

sqlite3_result_text16le,

sqlite3_result_value,

sqlite3_rollback_hook,

sqlite3_set_authorizer,

sqlite3_set_auxdata,

sqlite3_snprintf,

sqlite3_step,

sqlite3_table_column_metadata,

#ifndef SQLITE_OMIT_DEPRECATED

sqlite3_thread_cleanup,

#else

#endif

sqlite3_total_changes,

sqlite3_trace,

#ifndef SQLITE_OMIT_DEPRECATED

sqlite3_transfer_bindings,

#else

#endif

sqlite3_update_hook,

sqlite3_user_data,

sqlite3_value_blob,

sqlite3_value_bytes,

sqlite3_value_bytes16,

sqlite3_value_double,

sqlite3_value_int,

sqlite3_value_int64,

sqlite3_value_numeric_type,

sqlite3_value_text,

sqlite3_value_text16,

sqlite3_value_text16be,

sqlite3_value_text16le,

sqlite3_value_type,

sqlite3_vmprintf,

** The original API set ends here. All extensions can call any

** of the APIs above provided that the pointer is not NULL. But

** before calling APIs that follow, extension should check the

** sqlite3_libversion_number() to make sure they are dealing with

** a library that is new enough to support that API.

*************************************************************************

sqlite3_overload_function,

** Added after 3.3.13

sqlite3_prepare_v2,

sqlite3_prepare16_v2,

sqlite3_clear_bindings,

** Added for 3.4.1

sqlite3_create_module_v2,

** Added for 3.5.0

sqlite3_bind_zeroblob,

sqlite3_blob_bytes,

sqlite3_blob_close,

sqlite3_blob_open,

sqlite3_blob_read,

sqlite3_blob_write,

sqlite3_create_collation_v2,

sqlite3_file_control,

sqlite3_memory_highwater,

sqlite3_memory_used,

#ifdef SQLITE_MUTEX_OMIT

#else

sqlite3_mutex_alloc,

sqlite3_mutex_enter,

sqlite3_mutex_free,

sqlite3_mutex_leave,

sqlite3_mutex_try,

#endif

sqlite3_open_v2,

sqlite3_release_memory,

sqlite3_result_error_nomem,

sqlite3_result_error_toobig,

sqlite3_sleep,

sqlite3_soft_heap_limit,

sqlite3_vfs_find,

sqlite3_vfs_register,

sqlite3_vfs_unregister,

** Added for 3.5.8

sqlite3_threadsafe,

sqlite3_result_zeroblob,

sqlite3_result_error_code,

sqlite3_test_control,

sqlite3_randomness,

sqlite3_context_db_handle,

** Added for 3.6.0

sqlite3_extended_result_codes,

sqlite3_limit,

sqlite3_next_stmt,

sqlite3_sql,

sqlite3_status,

** Added for 3.7.4

sqlite3_backup_finish,

sqlite3_backup_init,

sqlite3_backup_pagecount,

sqlite3_backup_remaining,

sqlite3_backup_step,

#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS

sqlite3_compileoption_get,

sqlite3_compileoption_used,

#else

#endif

sqlite3_create_function_v2,

sqlite3_db_config,

sqlite3_db_mutex,

sqlite3_db_status,

sqlite3_extended_errcode,

sqlite3_log,

sqlite3_soft_heap_limit64,

sqlite3_sourceid,

sqlite3_stmt_status,

sqlite3_strnicmp,

#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY

sqlite3_unlock_notify,

#else

#endif

#ifndef SQLITE_OMIT_WAL

sqlite3_wal_autocheckpoint,

sqlite3_wal_checkpoint,

sqlite3_wal_hook,

#else

#endif

sqlite3_blob_reopen,

sqlite3_vtab_config,

sqlite3_vtab_on_conflict,

sqlite3_close_v2,

sqlite3_db_filename,

sqlite3_db_readonly,

sqlite3_db_release_memory,

sqlite3_errstr,

sqlite3_stmt_busy,

sqlite3_stmt_readonly,

sqlite3_stricmp,

sqlite3_uri_boolean,

sqlite3_uri_int64,

sqlite3_uri_parameter,

sqlite3_vsnprintf,

sqlite3_wal_checkpoint_v2,

/* Version 3.8.7 and later */

sqlite3_auto_extension,

sqlite3_bind_blob64,

sqlite3_bind_text64,

sqlite3_cancel_auto_extension,

sqlite3_load_extension,

sqlite3_malloc64,

sqlite3_msize,

sqlite3_realloc64,

sqlite3_reset_auto_extension,

sqlite3_result_blob64,

sqlite3_result_text64,

sqlite3_strglob,

/* Version 3.8.11 and later */

(sqlite3_value*(*)(const sqlite3_value*))sqlite3_value_dup,

sqlite3_value_free,

sqlite3_result_zeroblob64,

sqlite3_bind_zeroblob64,

/* Version 3.9.0 and later */

sqlite3_value_subtype,

sqlite3_result_subtype,

/* Version 3.10.0 and later */

sqlite3_status64,

sqlite3_strlike,

sqlite3_db_cacheflush,

/* Version 3.12.0 and later */

sqlite3_system_errno,

/* Version 3.14.0 and later */

sqlite3_trace_v2,

sqlite3_expanded_sql,

/* Version 3.18.0 and later */

sqlite3_set_last_insert_rowid,

/* Version 3.20.0 and later */

sqlite3_prepare_v3,

sqlite3_prepare16_v3,

sqlite3_bind_pointer,

sqlite3_result_pointer,

sqlite3_value_pointer,

/* Version 3.22.0 and later */

sqlite3_vtab_nochange,

sqlite3_value_nochange,

sqlite3_vtab_collation,

/* Version 3.24.0 and later */

sqlite3_keyword_count,

sqlite3_keyword_name,

sqlite3_keyword_check,

sqlite3_str_new,

sqlite3_str_finish,

sqlite3_str_appendf,

sqlite3_str_vappendf,

sqlite3_str_append,

sqlite3_str_appendall,

sqlite3_str_appendchar,

sqlite3_str_reset,

sqlite3_str_errcode,

sqlite3_str_length,

sqlite3_str_value,

/* Version 3.25.0 and later */

sqlite3_create_window_function,

/* Version 3.26.0 and later */

#ifdef SQLITE_ENABLE_NORMALIZE

sqlite3_normalized_sql,

#else

#endif

/* Version 3.28.0 and later */

sqlite3_stmt_isexplain,

sqlite3_value_frombind,

/* Version 3.30.0 and later */

#ifndef SQLITE_OMIT_VIRTUALTABLE

sqlite3_drop_modules,

#else

#endif

/* Version 3.31.0 and later */

sqlite3_hard_heap_limit64,

sqlite3_uri_key,

sqlite3_filename_database,

sqlite3_filename_journal,

sqlite3_filename_wal,

/* Version 3.32.0 and later */

sqlite3_create_filename,

sqlite3_free_filename,

sqlite3_database_file_object,

/* Version 3.34.0 and later */

sqlite3_txn_state,

/* Version 3.36.1 and later */

sqlite3_changes64,

sqlite3_total_changes64,

/* Version 3.37.0 and later */

sqlite3_autovacuum_pages,

/* Version 3.38.0 and later */

sqlite3_error_offset,

#ifndef SQLITE_OMIT_VIRTUALTABLE

sqlite3_vtab_rhs_value,

sqlite3_vtab_distinct,

sqlite3_vtab_in,

sqlite3_vtab_in_first,

sqlite3_vtab_in_next,

#else

#endif

/* Version 3.39.0 and later */

#ifndef SQLITE_OMIT_DESERIALIZE

sqlite3_deserialize,

sqlite3_serialize,

#else

#endif

sqlite3_db_name,

/* Version 3.40.0 and later */

sqlite3_value_encoding,

/* Version 3.41.0 and later */

sqlite3_is_interrupted,

/* Version 3.43.0 and later */

sqlite3_stmt_explain,

/* Version 3.44.0 and later */

sqlite3_get_clientdata,

sqlite3_set_clientdata,

/* Version 3.50.0 and later */

sqlite3_setlk_timeout,

/* Version 3.51.0 and later */

sqlite3_set_errmsg,

sqlite3_db_status64,

/* Version 3.52.0 and later */

sqlite3_str_truncate,

sqlite3_str_free,

#ifdef SQLITE_ENABLE_CARRAY

sqlite3_carray_bind,

sqlite3_carray_bind_v2

#else

#endif

};

/* True if x is the directory separator character

#if SQLITE_OS_WIN

# define DirSep(X) ((X)=='/'||(X)=='\\')

#else

# define DirSep(X) ((X)=='/')

#endif

** 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;

sqlite3_loadext_entry xInit;

char *zErrmsg = 0;

const char *zEntry;

char *zAltEntry = 0;

void **aHandle;

u64 nMsg = strlen(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";

/* tag-20210611-1. Some dlopen() implementations will segfault if given

** an oversize filename. Most filesystems have a pathname limit of 4K,

** so limit the extension filename length to about twice that.

** https://sqlite.org/forum/forumpost/08a0d6d9bf

** Later (2023-03-25): Save an extra 6 bytes for the filename suffix.

** See https://sqlite.org/forum/forumpost/24083b579d.

if( nMsg>SQLITE_MAX_PATHLEN ) goto extension_not_found;

/* Do not allow sqlite3_load_extension() to link to a copy of the

** running application, by passing in an empty filename. */

if( nMsg==0 ) goto extension_not_found;

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;

if( nMsg+strlen(azEndings[ii])+1<=SQLITE_MAX_PATHLEN ){

handle = sqlite3OsDlOpen(pVfs, zAltFile);

}

sqlite3_free(zAltFile);

}

#endif

if( handle==0 ) goto extension_not_found;

xInit = (sqlite3_loadext_entry)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 "/" up to the first ".",

** and skipping 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 that still finds no entry point, repeat a second time but this

** time include both alphabetic and numeric characters up to the first

** ".". Example:

** /usr/local/lib/libExample5.4.3.so ==> sqlite3_example5_init

if( xInit==0 && zProc==0 ){

int iFile, iEntry, c;

int ncFile = sqlite3Strlen30(zFile);

int cnt = 0;

zAltEntry = sqlite3_malloc64(ncFile+30);

if( zAltEntry==0 ){

sqlite3OsDlClose(pVfs, handle);

return SQLITE_NOMEM_BKPT;

}

do{

memcpy(zAltEntry, "sqlite3_", 8);

for(iFile=ncFile-1; iFile>=0 && !DirSep(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) || (cnt && sqlite3Isdigit(c)) ){

zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c];

}

memcpy(zAltEntry+iEntry, "_init", 6);

zEntry = zAltEntry;

xInit = (sqlite3_loadext_entry)sqlite3OsDlSym(pVfs, handle, zEntry);

}while( xInit==0 && (++cnt)<2 );

}

if( xInit==0 ){

if( pzErrMsg ){

nMsg += strlen(zEntry) + 300;

*pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);

if( zErrmsg ){

assert( nMsg<0x7fffffff ); /* zErrmsg would be NULL if not so */

sqlite3_snprintf((int)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;

extension_not_found:

if( pzErrMsg ){

nMsg += 300;

*pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg);

if( zErrmsg ){

assert( nMsg<0x7fffffff ); /* zErrmsg would be NULL if not so */

sqlite3_snprintf((int)nMsg, zErrmsg,

"unable to open shared library [%.*s]", SQLITE_MAX_PATHLEN, zFile);

sqlite3OsDlError(pVfs, nMsg-1, zErrmsg);

}

return SQLITE_ERROR;

}

int sqlite3_load_extension(

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 */

){

int rc;

sqlite3_mutex_enter(db->mutex);

rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg);

rc = sqlite3ApiExit(db, rc);

sqlite3_mutex_leave(db->mutex);

return rc;

}

** Call this routine when the database connection is closing in order

** to clean up loaded extensions

void sqlite3CloseExtensions(sqlite3 *db){

int i;

assert( sqlite3_mutex_held(db->mutex) );

for(i=0; i<db->nExtension; i++){

sqlite3OsDlClose(db->pVfs, db->aExtension[i]);

}

sqlite3DbFree(db, db->aExtension);

}

** Enable or disable extension loading. Extension loading is disabled by

** default so as not to open security holes in older applications.

int sqlite3_enable_load_extension(sqlite3 *db, int onoff){

#ifdef SQLITE_ENABLE_API_ARMOR

if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;

#endif

sqlite3_mutex_enter(db->mutex);

if( onoff ){

db->flags |= SQLITE_LoadExtension|SQLITE_LoadExtFunc;

}else{

db->flags &= ~(u64)(SQLITE_LoadExtension|SQLITE_LoadExtFunc);

}

sqlite3_mutex_leave(db->mutex);

return SQLITE_OK;

}

#endif /* !defined(SQLITE_OMIT_LOAD_EXTENSION) */

** The following object holds the list of automatically loaded

** extensions.

** This list is shared across threads. The SQLITE_MUTEX_STATIC_MAIN

** mutex must be held while accessing this list.

typedef struct sqlite3AutoExtList sqlite3AutoExtList;

static SQLITE_WSD struct sqlite3AutoExtList {

u32 nExt; /* Number of entries in aExt[] */

void (**aExt)(void); /* Pointers to the extension init functions */

} sqlite3Autoext = { 0, 0 };

/* The "wsdAutoext" macro will resolve to the autoextension

** state vector. If writable static data is unsupported on the target,

** we have to locate the state vector at run-time. In the more common

** case where writable static data is supported, wsdStat can refer directly

** to the "sqlite3Autoext" state vector declared above.

#ifdef SQLITE_OMIT_WSD

# define wsdAutoextInit \

sqlite3AutoExtList *x = &GLOBAL(sqlite3AutoExtList,sqlite3Autoext)

# define wsdAutoext x[0]

#else

# define wsdAutoextInit

# define wsdAutoext sqlite3Autoext

#endif

** Register a statically linked extension that is automatically

** loaded by every new database connection.

int sqlite3_auto_extension(

void (*xInit)(void)

){

int rc = SQLITE_OK;

#ifdef SQLITE_ENABLE_API_ARMOR

if( xInit==0 ) return SQLITE_MISUSE_BKPT;

#endif

#ifndef SQLITE_OMIT_AUTOINIT

rc = sqlite3_initialize();

if( rc ){

return rc;

}else

#endif

{

u32 i;

#if SQLITE_THREADSAFE

sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);

#endif

wsdAutoextInit;

sqlite3_mutex_enter(mutex);

for(i=0; i<wsdAutoext.nExt; i++){

if( wsdAutoext.aExt[i]==xInit ) break;

}

if( i==wsdAutoext.nExt ){

u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]);

void (**aNew)(void);

aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte);

if( aNew==0 ){

rc = SQLITE_NOMEM_BKPT;

}else{

wsdAutoext.aExt = aNew;

wsdAutoext.aExt[wsdAutoext.nExt] = xInit;

wsdAutoext.nExt++;

}

sqlite3_mutex_leave(mutex);

assert( (rc&0xff)==rc );

return rc;

}

** Cancel a prior call to sqlite3_auto_extension. Remove xInit from the

** set of routines that is invoked for each new database connection, if it

** is currently on the list. If xInit is not on the list, then this

** routine is a no-op.

** Return 1 if xInit was found on the list and removed. Return 0 if xInit

** was not on the list.

int sqlite3_cancel_auto_extension(

void (*xInit)(void)

){

#if SQLITE_THREADSAFE

sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);

#endif

int i;

int n = 0;

wsdAutoextInit;

#ifdef SQLITE_ENABLE_API_ARMOR

if( xInit==0 ) return 0;

#endif

sqlite3_mutex_enter(mutex);

for(i=(int)wsdAutoext.nExt-1; i>=0; i--){

if( wsdAutoext.aExt[i]==xInit ){

wsdAutoext.nExt--;

wsdAutoext.aExt[i] = wsdAutoext.aExt[wsdAutoext.nExt];

n++;

break;

}

sqlite3_mutex_leave(mutex);

return n;

}

** Reset the automatic extension loading mechanism.

void sqlite3_reset_auto_extension(void){

#ifndef SQLITE_OMIT_AUTOINIT

if( sqlite3_initialize()==SQLITE_OK )

#endif

{

#if SQLITE_THREADSAFE

sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);

#endif

wsdAutoextInit;

sqlite3_mutex_enter(mutex);

sqlite3_free(wsdAutoext.aExt);

wsdAutoext.aExt = 0;

wsdAutoext.nExt = 0;

sqlite3_mutex_leave(mutex);

}

** Load all automatic extensions.

** If anything goes wrong, set an error in the database connection.

void sqlite3AutoLoadExtensions(sqlite3 *db){

u32 i;

int go = 1;

int rc;

sqlite3_loadext_entry xInit;

wsdAutoextInit;

if( wsdAutoext.nExt==0 ){

/* Common case: early out without every having to acquire a mutex */

return;

}

for(i=0; go; i++){

char *zErrmsg;

#if SQLITE_THREADSAFE

sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN);

#endif

#ifdef SQLITE_OMIT_LOAD_EXTENSION

const sqlite3_api_routines *pThunk = 0;

#else

const sqlite3_api_routines *pThunk = &sqlite3Apis;

#endif

sqlite3_mutex_enter(mutex);

if( i>=wsdAutoext.nExt ){

xInit = 0;

go = 0;

}else{

xInit = (sqlite3_loadext_entry)wsdAutoext.aExt[i];

}

sqlite3_mutex_leave(mutex);

zErrmsg = 0;

if( xInit && (rc = xInit(db, &zErrmsg, pThunk))!=0 ){

sqlite3ErrorWithMsg(db, rc,

"automatic extension loading failed: %s", zErrmsg);

go = 0;

}

sqlite3_free(zErrmsg);

}

sqlcipher/src/loadext.c at sqlite-release · sqlcipher/sqlcipher · GitHub

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