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-rwxr-xr-xlibraries/sqlite/win32/loadext.c516
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diff --git a/libraries/sqlite/win32/loadext.c b/libraries/sqlite/win32/loadext.c
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1/*
2** 2006 June 7
3**
4** The author disclaims copyright to this source code. In place of
5** a legal notice, here is a blessing:
6**
7** May you do good and not evil.
8** May you find forgiveness for yourself and forgive others.
9** May you share freely, never taking more than you give.
10**
11*************************************************************************
12** This file contains code used to dynamically load extensions into
13** the SQLite library.
14*/
15#ifndef SQLITE_OMIT_LOAD_EXTENSION
16
17#define SQLITE_CORE 1 /* Disable the API redefinition in sqlite3ext.h */
18#include "sqlite3ext.h"
19#include "sqliteInt.h"
20#include <string.h>
21#include <ctype.h>
22
23/*
24** Some API routines are omitted when various features are
25** excluded from a build of SQLite. Substitute a NULL pointer
26** for any missing APIs.
27*/
28#ifndef SQLITE_ENABLE_COLUMN_METADATA
29# define sqlite3_column_database_name 0
30# define sqlite3_column_database_name16 0
31# define sqlite3_column_table_name 0
32# define sqlite3_column_table_name16 0
33# define sqlite3_column_origin_name 0
34# define sqlite3_column_origin_name16 0
35# define sqlite3_table_column_metadata 0
36#endif
37
38#ifdef SQLITE_OMIT_AUTHORIZATION
39# define sqlite3_set_authorizer 0
40#endif
41
42#ifdef SQLITE_OMIT_UTF16
43# define sqlite3_bind_text16 0
44# define sqlite3_collation_needed16 0
45# define sqlite3_column_decltype16 0
46# define sqlite3_column_name16 0
47# define sqlite3_column_text16 0
48# define sqlite3_complete16 0
49# define sqlite3_create_collation16 0
50# define sqlite3_create_function16 0
51# define sqlite3_errmsg16 0
52# define sqlite3_open16 0
53# define sqlite3_prepare16 0
54# define sqlite3_prepare16_v2 0
55# define sqlite3_result_error16 0
56# define sqlite3_result_text16 0
57# define sqlite3_result_text16be 0
58# define sqlite3_result_text16le 0
59# define sqlite3_value_text16 0
60# define sqlite3_value_text16be 0
61# define sqlite3_value_text16le 0
62# define sqlite3_column_database_name16 0
63# define sqlite3_column_table_name16 0
64# define sqlite3_column_origin_name16 0
65#endif
66
67#ifdef SQLITE_OMIT_COMPLETE
68# define sqlite3_complete 0
69# define sqlite3_complete16 0
70#endif
71
72#ifdef SQLITE_OMIT_PROGRESS_CALLBACK
73# define sqlite3_progress_handler 0
74#endif
75
76#ifdef SQLITE_OMIT_VIRTUALTABLE
77# define sqlite3_create_module 0
78# define sqlite3_create_module_v2 0
79# define sqlite3_declare_vtab 0
80#endif
81
82#ifdef SQLITE_OMIT_SHARED_CACHE
83# define sqlite3_enable_shared_cache 0
84#endif
85
86#ifdef SQLITE_OMIT_TRACE
87# define sqlite3_profile 0
88# define sqlite3_trace 0
89#endif
90
91#ifdef SQLITE_OMIT_GET_TABLE
92# define sqlite3_free_table 0
93# define sqlite3_get_table 0
94#endif
95
96#ifdef SQLITE_OMIT_INCRBLOB
97#define sqlite3_bind_zeroblob 0
98#define sqlite3_blob_bytes 0
99#define sqlite3_blob_close 0
100#define sqlite3_blob_open 0
101#define sqlite3_blob_read 0
102#define sqlite3_blob_write 0
103#endif
104
105/*
106** The following structure contains pointers to all SQLite API routines.
107** A pointer to this structure is passed into extensions when they are
108** loaded so that the extension can make calls back into the SQLite
109** library.
110**
111** When adding new APIs, add them to the bottom of this structure
112** in order to preserve backwards compatibility.
113**
114** Extensions that use newer APIs should first call the
115** sqlite3_libversion_number() to make sure that the API they
116** intend to use is supported by the library. Extensions should
117** also check to make sure that the pointer to the function is
118** not NULL before calling it.
119*/
120const sqlite3_api_routines sqlite3_apis = {
121 sqlite3_aggregate_context,
122 sqlite3_aggregate_count,
123 sqlite3_bind_blob,
124 sqlite3_bind_double,
125 sqlite3_bind_int,
126 sqlite3_bind_int64,
127 sqlite3_bind_null,
128 sqlite3_bind_parameter_count,
129 sqlite3_bind_parameter_index,
130 sqlite3_bind_parameter_name,
131 sqlite3_bind_text,
132 sqlite3_bind_text16,
133 sqlite3_bind_value,
134 sqlite3_busy_handler,
135 sqlite3_busy_timeout,
136 sqlite3_changes,
137 sqlite3_close,
138 sqlite3_collation_needed,
139 sqlite3_collation_needed16,
140 sqlite3_column_blob,
141 sqlite3_column_bytes,
142 sqlite3_column_bytes16,
143 sqlite3_column_count,
144 sqlite3_column_database_name,
145 sqlite3_column_database_name16,
146 sqlite3_column_decltype,
147 sqlite3_column_decltype16,
148 sqlite3_column_double,
149 sqlite3_column_int,
150 sqlite3_column_int64,
151 sqlite3_column_name,
152 sqlite3_column_name16,
153 sqlite3_column_origin_name,
154 sqlite3_column_origin_name16,
155 sqlite3_column_table_name,
156 sqlite3_column_table_name16,
157 sqlite3_column_text,
158 sqlite3_column_text16,
159 sqlite3_column_type,
160 sqlite3_column_value,
161 sqlite3_commit_hook,
162 sqlite3_complete,
163 sqlite3_complete16,
164 sqlite3_create_collation,
165 sqlite3_create_collation16,
166 sqlite3_create_function,
167 sqlite3_create_function16,
168 sqlite3_create_module,
169 sqlite3_data_count,
170 sqlite3_db_handle,
171 sqlite3_declare_vtab,
172 sqlite3_enable_shared_cache,
173 sqlite3_errcode,
174 sqlite3_errmsg,
175 sqlite3_errmsg16,
176 sqlite3_exec,
177 sqlite3_expired,
178 sqlite3_finalize,
179 sqlite3_free,
180 sqlite3_free_table,
181 sqlite3_get_autocommit,
182 sqlite3_get_auxdata,
183 sqlite3_get_table,
184 0, /* Was sqlite3_global_recover(), but that function is deprecated */
185 sqlite3_interrupt,
186 sqlite3_last_insert_rowid,
187 sqlite3_libversion,
188 sqlite3_libversion_number,
189 sqlite3_malloc,
190 sqlite3_mprintf,
191 sqlite3_open,
192 sqlite3_open16,
193 sqlite3_prepare,
194 sqlite3_prepare16,
195 sqlite3_profile,
196 sqlite3_progress_handler,
197 sqlite3_realloc,
198 sqlite3_reset,
199 sqlite3_result_blob,
200 sqlite3_result_double,
201 sqlite3_result_error,
202 sqlite3_result_error16,
203 sqlite3_result_int,
204 sqlite3_result_int64,
205 sqlite3_result_null,
206 sqlite3_result_text,
207 sqlite3_result_text16,
208 sqlite3_result_text16be,
209 sqlite3_result_text16le,
210 sqlite3_result_value,
211 sqlite3_rollback_hook,
212 sqlite3_set_authorizer,
213 sqlite3_set_auxdata,
214 sqlite3_snprintf,
215 sqlite3_step,
216 sqlite3_table_column_metadata,
217 sqlite3_thread_cleanup,
218 sqlite3_total_changes,
219 sqlite3_trace,
220 sqlite3_transfer_bindings,
221 sqlite3_update_hook,
222 sqlite3_user_data,
223 sqlite3_value_blob,
224 sqlite3_value_bytes,
225 sqlite3_value_bytes16,
226 sqlite3_value_double,
227 sqlite3_value_int,
228 sqlite3_value_int64,
229 sqlite3_value_numeric_type,
230 sqlite3_value_text,
231 sqlite3_value_text16,
232 sqlite3_value_text16be,
233 sqlite3_value_text16le,
234 sqlite3_value_type,
235 sqlite3_vmprintf,
236 /*
237 ** The original API set ends here. All extensions can call any
238 ** of the APIs above provided that the pointer is not NULL. But
239 ** before calling APIs that follow, extension should check the
240 ** sqlite3_libversion_number() to make sure they are dealing with
241 ** a library that is new enough to support that API.
242 *************************************************************************
243 */
244 sqlite3_overload_function,
245
246 /*
247 ** Added after 3.3.13
248 */
249 sqlite3_prepare_v2,
250 sqlite3_prepare16_v2,
251 sqlite3_clear_bindings,
252
253 /*
254 ** Added for 3.4.1
255 */
256 sqlite3_create_module_v2,
257
258 /*
259 ** Added for 3.5.0
260 */
261 sqlite3_bind_zeroblob,
262 sqlite3_blob_bytes,
263 sqlite3_blob_close,
264 sqlite3_blob_open,
265 sqlite3_blob_read,
266 sqlite3_blob_write,
267 sqlite3_create_collation_v2,
268 sqlite3_file_control,
269 sqlite3_memory_highwater,
270 sqlite3_memory_used,
271#ifdef SQLITE_MUTEX_NOOP
272 0,
273 0,
274 0,
275 0,
276 0,
277#else
278 sqlite3_mutex_alloc,
279 sqlite3_mutex_enter,
280 sqlite3_mutex_free,
281 sqlite3_mutex_leave,
282 sqlite3_mutex_try,
283#endif
284 sqlite3_open_v2,
285 sqlite3_release_memory,
286 sqlite3_result_error_nomem,
287 sqlite3_result_error_toobig,
288 sqlite3_sleep,
289 sqlite3_soft_heap_limit,
290 sqlite3_vfs_find,
291 sqlite3_vfs_register,
292 sqlite3_vfs_unregister,
293};
294
295/*
296** Attempt to load an SQLite extension library contained in the file
297** zFile. The entry point is zProc. zProc may be 0 in which case a
298** default entry point name (sqlite3_extension_init) is used. Use
299** of the default name is recommended.
300**
301** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong.
302**
303** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with
304** error message text. The calling function should free this memory
305** by calling sqlite3_free().
306*/
307static int sqlite3LoadExtension(
308 sqlite3 *db, /* Load the extension into this database connection */
309 const char *zFile, /* Name of the shared library containing extension */
310 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */
311 char **pzErrMsg /* Put error message here if not 0 */
312){
313 sqlite3_vfs *pVfs = db->pVfs;
314 void *handle;
315 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*);
316 char *zErrmsg = 0;
317 void **aHandle;
318
319 /* Ticket #1863. To avoid a creating security problems for older
320 ** applications that relink against newer versions of SQLite, the
321 ** ability to run load_extension is turned off by default. One
322 ** must call sqlite3_enable_load_extension() to turn on extension
323 ** loading. Otherwise you get the following error.
324 */
325 if( (db->flags & SQLITE_LoadExtension)==0 ){
326 if( pzErrMsg ){
327 *pzErrMsg = sqlite3_mprintf("not authorized");
328 }
329 return SQLITE_ERROR;
330 }
331
332 if( zProc==0 ){
333 zProc = "sqlite3_extension_init";
334 }
335
336 handle = sqlite3OsDlOpen(pVfs, zFile);
337 if( handle==0 ){
338 if( pzErrMsg ){
339 char zErr[256];
340 zErr[sizeof(zErr)-1] = '\0';
341 sqlite3_snprintf(sizeof(zErr)-1, zErr,
342 "unable to open shared library [%s]", zFile);
343 sqlite3OsDlError(pVfs, sizeof(zErr)-1, zErr);
344 *pzErrMsg = sqlite3DbStrDup(db, zErr);
345 }
346 return SQLITE_ERROR;
347 }
348 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*))
349 sqlite3OsDlSym(pVfs, handle, zProc);
350 if( xInit==0 ){
351 if( pzErrMsg ){
352 char zErr[256];
353 zErr[sizeof(zErr)-1] = '\0';
354 sqlite3_snprintf(sizeof(zErr)-1, zErr,
355 "no entry point [%s] in shared library [%s]", zProc,zFile);
356 sqlite3OsDlError(pVfs, sizeof(zErr)-1, zErr);
357 *pzErrMsg = sqlite3DbStrDup(db, zErr);
358 sqlite3OsDlClose(pVfs, handle);
359 }
360 return SQLITE_ERROR;
361 }else if( xInit(db, &zErrmsg, &sqlite3_apis) ){
362 if( pzErrMsg ){
363 *pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg);
364 }
365 sqlite3_free(zErrmsg);
366 sqlite3OsDlClose(pVfs, handle);
367 return SQLITE_ERROR;
368 }
369
370 /* Append the new shared library handle to the db->aExtension array. */
371 db->nExtension++;
372 aHandle = sqlite3DbMallocZero(db, sizeof(handle)*db->nExtension);
373 if( aHandle==0 ){
374 return SQLITE_NOMEM;
375 }
376 if( db->nExtension>0 ){
377 memcpy(aHandle, db->aExtension, sizeof(handle)*(db->nExtension-1));
378 }
379 sqlite3_free(db->aExtension);
380 db->aExtension = aHandle;
381
382 db->aExtension[db->nExtension-1] = handle;
383 return SQLITE_OK;
384}
385int sqlite3_load_extension(
386 sqlite3 *db, /* Load the extension into this database connection */
387 const char *zFile, /* Name of the shared library containing extension */
388 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */
389 char **pzErrMsg /* Put error message here if not 0 */
390){
391 int rc;
392 sqlite3_mutex_enter(db->mutex);
393 rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg);
394 sqlite3_mutex_leave(db->mutex);
395 return rc;
396}
397
398/*
399** Call this routine when the database connection is closing in order
400** to clean up loaded extensions
401*/
402void sqlite3CloseExtensions(sqlite3 *db){
403 int i;
404 assert( sqlite3_mutex_held(db->mutex) );
405 for(i=0; i<db->nExtension; i++){
406 sqlite3OsDlClose(db->pVfs, db->aExtension[i]);
407 }
408 sqlite3_free(db->aExtension);
409}
410
411/*
412** Enable or disable extension loading. Extension loading is disabled by
413** default so as not to open security holes in older applications.
414*/
415int sqlite3_enable_load_extension(sqlite3 *db, int onoff){
416 sqlite3_mutex_enter(db->mutex);
417 if( onoff ){
418 db->flags |= SQLITE_LoadExtension;
419 }else{
420 db->flags &= ~SQLITE_LoadExtension;
421 }
422 sqlite3_mutex_leave(db->mutex);
423 return SQLITE_OK;
424}
425
426/*
427** The following object holds the list of automatically loaded
428** extensions.
429**
430** This list is shared across threads. The SQLITE_MUTEX_STATIC_MASTER
431** mutex must be held while accessing this list.
432*/
433static struct {
434 int nExt; /* Number of entries in aExt[] */
435 void **aExt; /* Pointers to the extension init functions */
436} autoext = { 0, 0 };
437
438
439/*
440** Register a statically linked extension that is automatically
441** loaded by every new database connection.
442*/
443int sqlite3_auto_extension(void *xInit){
444 int i;
445 int rc = SQLITE_OK;
446 sqlite3_mutex *mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER);
447 sqlite3_mutex_enter(mutex);
448 for(i=0; i<autoext.nExt; i++){
449 if( autoext.aExt[i]==xInit ) break;
450 }
451 if( i==autoext.nExt ){
452 int nByte = (autoext.nExt+1)*sizeof(autoext.aExt[0]);
453 void **aNew;
454 aNew = sqlite3_realloc(autoext.aExt, nByte);
455 if( aNew==0 ){
456 rc = SQLITE_NOMEM;
457 }else{
458 autoext.aExt = aNew;
459 autoext.aExt[autoext.nExt] = xInit;
460 autoext.nExt++;
461 }
462 }
463 sqlite3_mutex_leave(mutex);
464 assert( (rc&0xff)==rc );
465 return rc;
466}
467
468/*
469** Reset the automatic extension loading mechanism.
470*/
471void sqlite3_reset_auto_extension(void){
472 sqlite3_mutex *mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER);
473 sqlite3_mutex_enter(mutex);
474 sqlite3_free(autoext.aExt);
475 autoext.aExt = 0;
476 autoext.nExt = 0;
477 sqlite3_mutex_leave(mutex);
478}
479
480/*
481** Load all automatic extensions.
482*/
483int sqlite3AutoLoadExtensions(sqlite3 *db){
484 int i;
485 int go = 1;
486 int rc = SQLITE_OK;
487 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*);
488
489 if( autoext.nExt==0 ){
490 /* Common case: early out without every having to acquire a mutex */
491 return SQLITE_OK;
492 }
493 for(i=0; go; i++){
494 char *zErrmsg = 0;
495 sqlite3_mutex *mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER);
496 sqlite3_mutex_enter(mutex);
497 if( i>=autoext.nExt ){
498 xInit = 0;
499 go = 0;
500 }else{
501 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*))
502 autoext.aExt[i];
503 }
504 sqlite3_mutex_leave(mutex);
505 if( xInit && xInit(db, &zErrmsg, &sqlite3_apis) ){
506 sqlite3Error(db, SQLITE_ERROR,
507 "automatic extension loading failed: %s", zErrmsg);
508 go = 0;
509 rc = SQLITE_ERROR;
510 sqlite3_free(zErrmsg);
511 }
512 }
513 return rc;
514}
515
516#endif /* SQLITE_OMIT_LOAD_EXTENSION */
generated by cgit v1.1 at 2024-12-22 04:41:56 +0000