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 16 #ifndef SQLITE_CORE 17 #define SQLITE_CORE 1 /* Disable the API redefinition in sqlite3ext.h */ 18 #endif 19 #include "sqlite3ext.h" 20 #include "sqliteInt.h" 21 22 #ifndef SQLITE_OMIT_LOAD_EXTENSION 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 #endif 36 37 #ifdef SQLITE_OMIT_AUTHORIZATION 38 # define sqlite3_set_authorizer 0 39 #endif 40 41 #ifdef SQLITE_OMIT_UTF16 42 # define sqlite3_bind_text16 0 43 # define sqlite3_collation_needed16 0 44 # define sqlite3_column_decltype16 0 45 # define sqlite3_column_name16 0 46 # define sqlite3_column_text16 0 47 # define sqlite3_complete16 0 48 # define sqlite3_create_collation16 0 49 # define sqlite3_create_function16 0 50 # define sqlite3_errmsg16 0 51 # define sqlite3_open16 0 52 # define sqlite3_prepare16 0 53 # define sqlite3_prepare16_v2 0 54 # define sqlite3_prepare16_v3 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_DECLTYPE 73 # define sqlite3_column_decltype16 0 74 # define sqlite3_column_decltype 0 75 #endif 76 77 #ifdef SQLITE_OMIT_PROGRESS_CALLBACK 78 # define sqlite3_progress_handler 0 79 #endif 80 81 #ifdef SQLITE_OMIT_VIRTUALTABLE 82 # define sqlite3_create_module 0 83 # define sqlite3_create_module_v2 0 84 # define sqlite3_declare_vtab 0 85 # define sqlite3_vtab_config 0 86 # define sqlite3_vtab_on_conflict 0 87 # define sqlite3_vtab_collation 0 88 #endif 89 90 #ifdef SQLITE_OMIT_SHARED_CACHE 91 # define sqlite3_enable_shared_cache 0 92 #endif 93 94 #if defined(SQLITE_OMIT_TRACE) || defined(SQLITE_OMIT_DEPRECATED) 95 # define sqlite3_profile 0 96 # define sqlite3_trace 0 97 #endif 98 99 #ifdef SQLITE_OMIT_GET_TABLE 100 # define sqlite3_free_table 0 101 # define sqlite3_get_table 0 102 #endif 103 104 #ifdef SQLITE_OMIT_INCRBLOB 105 #define sqlite3_bind_zeroblob 0 106 #define sqlite3_blob_bytes 0 107 #define sqlite3_blob_close 0 108 #define sqlite3_blob_open 0 109 #define sqlite3_blob_read 0 110 #define sqlite3_blob_write 0 111 #define sqlite3_blob_reopen 0 112 #endif 113 114 #if defined(SQLITE_OMIT_TRACE) 115 # define sqlite3_trace_v2 0 116 #endif 117 118 /* 119 ** The following structure contains pointers to all SQLite API routines. 120 ** A pointer to this structure is passed into extensions when they are 121 ** loaded so that the extension can make calls back into the SQLite 122 ** library. 123 ** 124 ** When adding new APIs, add them to the bottom of this structure 125 ** in order to preserve backwards compatibility. 126 ** 127 ** Extensions that use newer APIs should first call the 128 ** sqlite3_libversion_number() to make sure that the API they 129 ** intend to use is supported by the library. Extensions should 130 ** also check to make sure that the pointer to the function is 131 ** not NULL before calling it. 132 */ 133 static const sqlite3_api_routines sqlite3Apis = { 134 sqlite3_aggregate_context, 135 #ifndef SQLITE_OMIT_DEPRECATED 136 sqlite3_aggregate_count, 137 #else 138 0, 139 #endif 140 sqlite3_bind_blob, 141 sqlite3_bind_double, 142 sqlite3_bind_int, 143 sqlite3_bind_int64, 144 sqlite3_bind_null, 145 sqlite3_bind_parameter_count, 146 sqlite3_bind_parameter_index, 147 sqlite3_bind_parameter_name, 148 sqlite3_bind_text, 149 sqlite3_bind_text16, 150 sqlite3_bind_value, 151 sqlite3_busy_handler, 152 sqlite3_busy_timeout, 153 sqlite3_changes, 154 sqlite3_close, 155 sqlite3_collation_needed, 156 sqlite3_collation_needed16, 157 sqlite3_column_blob, 158 sqlite3_column_bytes, 159 sqlite3_column_bytes16, 160 sqlite3_column_count, 161 sqlite3_column_database_name, 162 sqlite3_column_database_name16, 163 sqlite3_column_decltype, 164 sqlite3_column_decltype16, 165 sqlite3_column_double, 166 sqlite3_column_int, 167 sqlite3_column_int64, 168 sqlite3_column_name, 169 sqlite3_column_name16, 170 sqlite3_column_origin_name, 171 sqlite3_column_origin_name16, 172 sqlite3_column_table_name, 173 sqlite3_column_table_name16, 174 sqlite3_column_text, 175 sqlite3_column_text16, 176 sqlite3_column_type, 177 sqlite3_column_value, 178 sqlite3_commit_hook, 179 sqlite3_complete, 180 sqlite3_complete16, 181 sqlite3_create_collation, 182 sqlite3_create_collation16, 183 sqlite3_create_function, 184 sqlite3_create_function16, 185 sqlite3_create_module, 186 sqlite3_data_count, 187 sqlite3_db_handle, 188 sqlite3_declare_vtab, 189 sqlite3_enable_shared_cache, 190 sqlite3_errcode, 191 sqlite3_errmsg, 192 sqlite3_errmsg16, 193 sqlite3_exec, 194 #ifndef SQLITE_OMIT_DEPRECATED 195 sqlite3_expired, 196 #else 197 0, 198 #endif 199 sqlite3_finalize, 200 sqlite3_free, 201 sqlite3_free_table, 202 sqlite3_get_autocommit, 203 sqlite3_get_auxdata, 204 sqlite3_get_table, 205 0, /* Was sqlite3_global_recover(), but that function is deprecated */ 206 sqlite3_interrupt, 207 sqlite3_last_insert_rowid, 208 sqlite3_libversion, 209 sqlite3_libversion_number, 210 sqlite3_malloc, 211 sqlite3_mprintf, 212 sqlite3_open, 213 sqlite3_open16, 214 sqlite3_prepare, 215 sqlite3_prepare16, 216 sqlite3_profile, 217 sqlite3_progress_handler, 218 sqlite3_realloc, 219 sqlite3_reset, 220 sqlite3_result_blob, 221 sqlite3_result_double, 222 sqlite3_result_error, 223 sqlite3_result_error16, 224 sqlite3_result_int, 225 sqlite3_result_int64, 226 sqlite3_result_null, 227 sqlite3_result_text, 228 sqlite3_result_text16, 229 sqlite3_result_text16be, 230 sqlite3_result_text16le, 231 sqlite3_result_value, 232 sqlite3_rollback_hook, 233 sqlite3_set_authorizer, 234 sqlite3_set_auxdata, 235 sqlite3_snprintf, 236 sqlite3_step, 237 sqlite3_table_column_metadata, 238 #ifndef SQLITE_OMIT_DEPRECATED 239 sqlite3_thread_cleanup, 240 #else 241 0, 242 #endif 243 sqlite3_total_changes, 244 sqlite3_trace, 245 #ifndef SQLITE_OMIT_DEPRECATED 246 sqlite3_transfer_bindings, 247 #else 248 0, 249 #endif 250 sqlite3_update_hook, 251 sqlite3_user_data, 252 sqlite3_value_blob, 253 sqlite3_value_bytes, 254 sqlite3_value_bytes16, 255 sqlite3_value_double, 256 sqlite3_value_int, 257 sqlite3_value_int64, 258 sqlite3_value_numeric_type, 259 sqlite3_value_text, 260 sqlite3_value_text16, 261 sqlite3_value_text16be, 262 sqlite3_value_text16le, 263 sqlite3_value_type, 264 sqlite3_vmprintf, 265 /* 266 ** The original API set ends here. All extensions can call any 267 ** of the APIs above provided that the pointer is not NULL. But 268 ** before calling APIs that follow, extension should check the 269 ** sqlite3_libversion_number() to make sure they are dealing with 270 ** a library that is new enough to support that API. 271 ************************************************************************* 272 */ 273 sqlite3_overload_function, 274 275 /* 276 ** Added after 3.3.13 277 */ 278 sqlite3_prepare_v2, 279 sqlite3_prepare16_v2, 280 sqlite3_clear_bindings, 281 282 /* 283 ** Added for 3.4.1 284 */ 285 sqlite3_create_module_v2, 286 287 /* 288 ** Added for 3.5.0 289 */ 290 sqlite3_bind_zeroblob, 291 sqlite3_blob_bytes, 292 sqlite3_blob_close, 293 sqlite3_blob_open, 294 sqlite3_blob_read, 295 sqlite3_blob_write, 296 sqlite3_create_collation_v2, 297 sqlite3_file_control, 298 sqlite3_memory_highwater, 299 sqlite3_memory_used, 300 #ifdef SQLITE_MUTEX_OMIT 301 0, 302 0, 303 0, 304 0, 305 0, 306 #else 307 sqlite3_mutex_alloc, 308 sqlite3_mutex_enter, 309 sqlite3_mutex_free, 310 sqlite3_mutex_leave, 311 sqlite3_mutex_try, 312 #endif 313 sqlite3_open_v2, 314 sqlite3_release_memory, 315 sqlite3_result_error_nomem, 316 sqlite3_result_error_toobig, 317 sqlite3_sleep, 318 sqlite3_soft_heap_limit, 319 sqlite3_vfs_find, 320 sqlite3_vfs_register, 321 sqlite3_vfs_unregister, 322 323 /* 324 ** Added for 3.5.8 325 */ 326 sqlite3_threadsafe, 327 sqlite3_result_zeroblob, 328 sqlite3_result_error_code, 329 sqlite3_test_control, 330 sqlite3_randomness, 331 sqlite3_context_db_handle, 332 333 /* 334 ** Added for 3.6.0 335 */ 336 sqlite3_extended_result_codes, 337 sqlite3_limit, 338 sqlite3_next_stmt, 339 sqlite3_sql, 340 sqlite3_status, 341 342 /* 343 ** Added for 3.7.4 344 */ 345 sqlite3_backup_finish, 346 sqlite3_backup_init, 347 sqlite3_backup_pagecount, 348 sqlite3_backup_remaining, 349 sqlite3_backup_step, 350 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS 351 sqlite3_compileoption_get, 352 sqlite3_compileoption_used, 353 #else 354 0, 355 0, 356 #endif 357 sqlite3_create_function_v2, 358 sqlite3_db_config, 359 sqlite3_db_mutex, 360 sqlite3_db_status, 361 sqlite3_extended_errcode, 362 sqlite3_log, 363 sqlite3_soft_heap_limit64, 364 sqlite3_sourceid, 365 sqlite3_stmt_status, 366 sqlite3_strnicmp, 367 #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY 368 sqlite3_unlock_notify, 369 #else 370 0, 371 #endif 372 #ifndef SQLITE_OMIT_WAL 373 sqlite3_wal_autocheckpoint, 374 sqlite3_wal_checkpoint, 375 sqlite3_wal_hook, 376 #else 377 0, 378 0, 379 0, 380 #endif 381 sqlite3_blob_reopen, 382 sqlite3_vtab_config, 383 sqlite3_vtab_on_conflict, 384 sqlite3_close_v2, 385 sqlite3_db_filename, 386 sqlite3_db_readonly, 387 sqlite3_db_release_memory, 388 sqlite3_errstr, 389 sqlite3_stmt_busy, 390 sqlite3_stmt_readonly, 391 sqlite3_stricmp, 392 sqlite3_uri_boolean, 393 sqlite3_uri_int64, 394 sqlite3_uri_parameter, 395 sqlite3_vsnprintf, 396 sqlite3_wal_checkpoint_v2, 397 /* Version 3.8.7 and later */ 398 sqlite3_auto_extension, 399 sqlite3_bind_blob64, 400 sqlite3_bind_text64, 401 sqlite3_cancel_auto_extension, 402 sqlite3_load_extension, 403 sqlite3_malloc64, 404 sqlite3_msize, 405 sqlite3_realloc64, 406 sqlite3_reset_auto_extension, 407 sqlite3_result_blob64, 408 sqlite3_result_text64, 409 sqlite3_strglob, 410 /* Version 3.8.11 and later */ 411 (sqlite3_value*(*)(const sqlite3_value*))sqlite3_value_dup, 412 sqlite3_value_free, 413 sqlite3_result_zeroblob64, 414 sqlite3_bind_zeroblob64, 415 /* Version 3.9.0 and later */ 416 sqlite3_value_subtype, 417 sqlite3_result_subtype, 418 /* Version 3.10.0 and later */ 419 sqlite3_status64, 420 sqlite3_strlike, 421 sqlite3_db_cacheflush, 422 /* Version 3.12.0 and later */ 423 sqlite3_system_errno, 424 /* Version 3.14.0 and later */ 425 sqlite3_trace_v2, 426 sqlite3_expanded_sql, 427 /* Version 3.18.0 and later */ 428 sqlite3_set_last_insert_rowid, 429 /* Version 3.20.0 and later */ 430 sqlite3_prepare_v3, 431 sqlite3_prepare16_v3, 432 sqlite3_bind_pointer, 433 sqlite3_result_pointer, 434 sqlite3_value_pointer, 435 /* Version 3.22.0 and later */ 436 sqlite3_vtab_nochange, 437 sqlite3_value_nochange, 438 sqlite3_vtab_collation, 439 /* Version 3.24.0 and later */ 440 sqlite3_keyword_count, 441 sqlite3_keyword_name, 442 sqlite3_keyword_check, 443 sqlite3_str_new, 444 sqlite3_str_finish, 445 sqlite3_str_appendf, 446 sqlite3_str_vappendf, 447 sqlite3_str_append, 448 sqlite3_str_appendall, 449 sqlite3_str_appendchar, 450 sqlite3_str_reset, 451 sqlite3_str_errcode, 452 sqlite3_str_length, 453 sqlite3_str_value, 454 /* Version 3.25.0 and later */ 455 sqlite3_create_window_function, 456 /* Version 3.26.0 and later */ 457 #ifdef SQLITE_ENABLE_NORMALIZE 458 sqlite3_normalized_sql, 459 #else 460 0, 461 #endif 462 /* Version 3.28.0 and later */ 463 sqlite3_stmt_isexplain, 464 sqlite3_value_frombind 465 }; 466 467 /* 468 ** Attempt to load an SQLite extension library contained in the file 469 ** zFile. The entry point is zProc. zProc may be 0 in which case a 470 ** default entry point name (sqlite3_extension_init) is used. Use 471 ** of the default name is recommended. 472 ** 473 ** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong. 474 ** 475 ** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with 476 ** error message text. The calling function should free this memory 477 ** by calling sqlite3DbFree(db, ). 478 */ 479 static int sqlite3LoadExtension( 480 sqlite3 *db, /* Load the extension into this database connection */ 481 const char *zFile, /* Name of the shared library containing extension */ 482 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 483 char **pzErrMsg /* Put error message here if not 0 */ 484 ){ 485 sqlite3_vfs *pVfs = db->pVfs; 486 void *handle; 487 sqlite3_loadext_entry xInit; 488 char *zErrmsg = 0; 489 const char *zEntry; 490 char *zAltEntry = 0; 491 void **aHandle; 492 u64 nMsg = 300 + sqlite3Strlen30(zFile); 493 int ii; 494 int rc; 495 496 /* Shared library endings to try if zFile cannot be loaded as written */ 497 static const char *azEndings[] = { 498 #if SQLITE_OS_WIN 499 "dll" 500 #elif defined(__APPLE__) 501 "dylib" 502 #else 503 "so" 504 #endif 505 }; 506 507 508 if( pzErrMsg ) *pzErrMsg = 0; 509 510 /* Ticket #1863. To avoid a creating security problems for older 511 ** applications that relink against newer versions of SQLite, the 512 ** ability to run load_extension is turned off by default. One 513 ** must call either sqlite3_enable_load_extension(db) or 514 ** sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, 1, 0) 515 ** to turn on extension loading. 516 */ 517 if( (db->flags & SQLITE_LoadExtension)==0 ){ 518 if( pzErrMsg ){ 519 *pzErrMsg = sqlite3_mprintf("not authorized"); 520 } 521 return SQLITE_ERROR; 522 } 523 524 zEntry = zProc ? zProc : "sqlite3_extension_init"; 525 526 handle = sqlite3OsDlOpen(pVfs, zFile); 527 #if SQLITE_OS_UNIX || SQLITE_OS_WIN 528 for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){ 529 char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]); 530 if( zAltFile==0 ) return SQLITE_NOMEM_BKPT; 531 handle = sqlite3OsDlOpen(pVfs, zAltFile); 532 sqlite3_free(zAltFile); 533 } 534 #endif 535 if( handle==0 ){ 536 if( pzErrMsg ){ 537 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 538 if( zErrmsg ){ 539 sqlite3_snprintf(nMsg, zErrmsg, 540 "unable to open shared library [%s]", zFile); 541 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 542 } 543 } 544 return SQLITE_ERROR; 545 } 546 xInit = (sqlite3_loadext_entry)sqlite3OsDlSym(pVfs, handle, zEntry); 547 548 /* If no entry point was specified and the default legacy 549 ** entry point name "sqlite3_extension_init" was not found, then 550 ** construct an entry point name "sqlite3_X_init" where the X is 551 ** replaced by the lowercase value of every ASCII alphabetic 552 ** character in the filename after the last "/" upto the first ".", 553 ** and eliding the first three characters if they are "lib". 554 ** Examples: 555 ** 556 ** /usr/local/lib/libExample5.4.3.so ==> sqlite3_example_init 557 ** C:/lib/mathfuncs.dll ==> sqlite3_mathfuncs_init 558 */ 559 if( xInit==0 && zProc==0 ){ 560 int iFile, iEntry, c; 561 int ncFile = sqlite3Strlen30(zFile); 562 zAltEntry = sqlite3_malloc64(ncFile+30); 563 if( zAltEntry==0 ){ 564 sqlite3OsDlClose(pVfs, handle); 565 return SQLITE_NOMEM_BKPT; 566 } 567 memcpy(zAltEntry, "sqlite3_", 8); 568 for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){} 569 iFile++; 570 if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3; 571 for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){ 572 if( sqlite3Isalpha(c) ){ 573 zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c]; 574 } 575 } 576 memcpy(zAltEntry+iEntry, "_init", 6); 577 zEntry = zAltEntry; 578 xInit = (sqlite3_loadext_entry)sqlite3OsDlSym(pVfs, handle, zEntry); 579 } 580 if( xInit==0 ){ 581 if( pzErrMsg ){ 582 nMsg += sqlite3Strlen30(zEntry); 583 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 584 if( zErrmsg ){ 585 sqlite3_snprintf(nMsg, zErrmsg, 586 "no entry point [%s] in shared library [%s]", zEntry, zFile); 587 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 588 } 589 } 590 sqlite3OsDlClose(pVfs, handle); 591 sqlite3_free(zAltEntry); 592 return SQLITE_ERROR; 593 } 594 sqlite3_free(zAltEntry); 595 rc = xInit(db, &zErrmsg, &sqlite3Apis); 596 if( rc ){ 597 if( rc==SQLITE_OK_LOAD_PERMANENTLY ) return SQLITE_OK; 598 if( pzErrMsg ){ 599 *pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg); 600 } 601 sqlite3_free(zErrmsg); 602 sqlite3OsDlClose(pVfs, handle); 603 return SQLITE_ERROR; 604 } 605 606 /* Append the new shared library handle to the db->aExtension array. */ 607 aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1)); 608 if( aHandle==0 ){ 609 return SQLITE_NOMEM_BKPT; 610 } 611 if( db->nExtension>0 ){ 612 memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension); 613 } 614 sqlite3DbFree(db, db->aExtension); 615 db->aExtension = aHandle; 616 617 db->aExtension[db->nExtension++] = handle; 618 return SQLITE_OK; 619 } 620 int sqlite3_load_extension( 621 sqlite3 *db, /* Load the extension into this database connection */ 622 const char *zFile, /* Name of the shared library containing extension */ 623 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 624 char **pzErrMsg /* Put error message here if not 0 */ 625 ){ 626 int rc; 627 sqlite3_mutex_enter(db->mutex); 628 rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg); 629 rc = sqlite3ApiExit(db, rc); 630 sqlite3_mutex_leave(db->mutex); 631 return rc; 632 } 633 634 /* 635 ** Call this routine when the database connection is closing in order 636 ** to clean up loaded extensions 637 */ 638 void sqlite3CloseExtensions(sqlite3 *db){ 639 int i; 640 assert( sqlite3_mutex_held(db->mutex) ); 641 for(i=0; i<db->nExtension; i++){ 642 sqlite3OsDlClose(db->pVfs, db->aExtension[i]); 643 } 644 sqlite3DbFree(db, db->aExtension); 645 } 646 647 /* 648 ** Enable or disable extension loading. Extension loading is disabled by 649 ** default so as not to open security holes in older applications. 650 */ 651 int sqlite3_enable_load_extension(sqlite3 *db, int onoff){ 652 sqlite3_mutex_enter(db->mutex); 653 if( onoff ){ 654 db->flags |= SQLITE_LoadExtension|SQLITE_LoadExtFunc; 655 }else{ 656 db->flags &= ~(u64)(SQLITE_LoadExtension|SQLITE_LoadExtFunc); 657 } 658 sqlite3_mutex_leave(db->mutex); 659 return SQLITE_OK; 660 } 661 662 #endif /* !defined(SQLITE_OMIT_LOAD_EXTENSION) */ 663 664 /* 665 ** The following object holds the list of automatically loaded 666 ** extensions. 667 ** 668 ** This list is shared across threads. The SQLITE_MUTEX_STATIC_MASTER 669 ** mutex must be held while accessing this list. 670 */ 671 typedef struct sqlite3AutoExtList sqlite3AutoExtList; 672 static SQLITE_WSD struct sqlite3AutoExtList { 673 u32 nExt; /* Number of entries in aExt[] */ 674 void (**aExt)(void); /* Pointers to the extension init functions */ 675 } sqlite3Autoext = { 0, 0 }; 676 677 /* The "wsdAutoext" macro will resolve to the autoextension 678 ** state vector. If writable static data is unsupported on the target, 679 ** we have to locate the state vector at run-time. In the more common 680 ** case where writable static data is supported, wsdStat can refer directly 681 ** to the "sqlite3Autoext" state vector declared above. 682 */ 683 #ifdef SQLITE_OMIT_WSD 684 # define wsdAutoextInit \ 685 sqlite3AutoExtList *x = &GLOBAL(sqlite3AutoExtList,sqlite3Autoext) 686 # define wsdAutoext x[0] 687 #else 688 # define wsdAutoextInit 689 # define wsdAutoext sqlite3Autoext 690 #endif 691 692 693 /* 694 ** Register a statically linked extension that is automatically 695 ** loaded by every new database connection. 696 */ 697 int sqlite3_auto_extension( 698 void (*xInit)(void) 699 ){ 700 int rc = SQLITE_OK; 701 #ifndef SQLITE_OMIT_AUTOINIT 702 rc = sqlite3_initialize(); 703 if( rc ){ 704 return rc; 705 }else 706 #endif 707 { 708 u32 i; 709 #if SQLITE_THREADSAFE 710 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 711 #endif 712 wsdAutoextInit; 713 sqlite3_mutex_enter(mutex); 714 for(i=0; i<wsdAutoext.nExt; i++){ 715 if( wsdAutoext.aExt[i]==xInit ) break; 716 } 717 if( i==wsdAutoext.nExt ){ 718 u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]); 719 void (**aNew)(void); 720 aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte); 721 if( aNew==0 ){ 722 rc = SQLITE_NOMEM_BKPT; 723 }else{ 724 wsdAutoext.aExt = aNew; 725 wsdAutoext.aExt[wsdAutoext.nExt] = xInit; 726 wsdAutoext.nExt++; 727 } 728 } 729 sqlite3_mutex_leave(mutex); 730 assert( (rc&0xff)==rc ); 731 return rc; 732 } 733 } 734 735 /* 736 ** Cancel a prior call to sqlite3_auto_extension. Remove xInit from the 737 ** set of routines that is invoked for each new database connection, if it 738 ** is currently on the list. If xInit is not on the list, then this 739 ** routine is a no-op. 740 ** 741 ** Return 1 if xInit was found on the list and removed. Return 0 if xInit 742 ** was not on the list. 743 */ 744 int sqlite3_cancel_auto_extension( 745 void (*xInit)(void) 746 ){ 747 #if SQLITE_THREADSAFE 748 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 749 #endif 750 int i; 751 int n = 0; 752 wsdAutoextInit; 753 sqlite3_mutex_enter(mutex); 754 for(i=(int)wsdAutoext.nExt-1; i>=0; i--){ 755 if( wsdAutoext.aExt[i]==xInit ){ 756 wsdAutoext.nExt--; 757 wsdAutoext.aExt[i] = wsdAutoext.aExt[wsdAutoext.nExt]; 758 n++; 759 break; 760 } 761 } 762 sqlite3_mutex_leave(mutex); 763 return n; 764 } 765 766 /* 767 ** Reset the automatic extension loading mechanism. 768 */ 769 void sqlite3_reset_auto_extension(void){ 770 #ifndef SQLITE_OMIT_AUTOINIT 771 if( sqlite3_initialize()==SQLITE_OK ) 772 #endif 773 { 774 #if SQLITE_THREADSAFE 775 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 776 #endif 777 wsdAutoextInit; 778 sqlite3_mutex_enter(mutex); 779 sqlite3_free(wsdAutoext.aExt); 780 wsdAutoext.aExt = 0; 781 wsdAutoext.nExt = 0; 782 sqlite3_mutex_leave(mutex); 783 } 784 } 785 786 /* 787 ** Load all automatic extensions. 788 ** 789 ** If anything goes wrong, set an error in the database connection. 790 */ 791 void sqlite3AutoLoadExtensions(sqlite3 *db){ 792 u32 i; 793 int go = 1; 794 int rc; 795 sqlite3_loadext_entry xInit; 796 797 wsdAutoextInit; 798 if( wsdAutoext.nExt==0 ){ 799 /* Common case: early out without every having to acquire a mutex */ 800 return; 801 } 802 for(i=0; go; i++){ 803 char *zErrmsg; 804 #if SQLITE_THREADSAFE 805 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 806 #endif 807 #ifdef SQLITE_OMIT_LOAD_EXTENSION 808 const sqlite3_api_routines *pThunk = 0; 809 #else 810 const sqlite3_api_routines *pThunk = &sqlite3Apis; 811 #endif 812 sqlite3_mutex_enter(mutex); 813 if( i>=wsdAutoext.nExt ){ 814 xInit = 0; 815 go = 0; 816 }else{ 817 xInit = (sqlite3_loadext_entry)wsdAutoext.aExt[i]; 818 } 819 sqlite3_mutex_leave(mutex); 820 zErrmsg = 0; 821 if( xInit && (rc = xInit(db, &zErrmsg, pThunk))!=0 ){ 822 sqlite3ErrorWithMsg(db, rc, 823 "automatic extension loading failed: %s", zErrmsg); 824 go = 0; 825 } 826 sqlite3_free(zErrmsg); 827 } 828 } 829