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 /* Version 3.30.0 and later */ 466 #ifndef SQLITE_OMIT_VIRTUALTABLE 467 sqlite3_drop_modules, 468 #else 469 0, 470 #endif 471 /* Version 3.31.0 and later */ 472 sqlite3_hard_heap_limit64, 473 sqlite3_uri_key, 474 sqlite3_filename_database, 475 sqlite3_filename_journal, 476 sqlite3_filename_wal, 477 /* Version 3.32.0 and later */ 478 sqlite3_create_filename, 479 sqlite3_free_filename, 480 sqlite3_database_file_object, 481 /* Version 3.34.0 and later */ 482 sqlite3_txn_state, 483 /* Version 3.36.1 and later */ 484 sqlite3_changes64, 485 sqlite3_total_changes64, 486 /* Version 3.37.0 and later */ 487 sqlite3_autovacuum_pages, 488 /* Version 3.38.0 and later */ 489 sqlite3_error_offset, 490 #ifndef SQLITE_OMIT_VIRTUALTABLE 491 sqlite3_vtab_rhs_value, 492 sqlite3_vtab_distinct, 493 sqlite3_vtab_in, 494 sqlite3_vtab_in_first, 495 sqlite3_vtab_in_next, 496 #else 497 0, 498 0, 499 0, 500 0, 501 0, 502 #endif 503 /* Version 3.39.0 and later */ 504 #ifndef SQLITE_OMIT_DESERIALIZE 505 sqlite3_deserialize, 506 sqlite3_serialize 507 #else 508 0, 509 0 510 #endif 511 }; 512 513 /* True if x is the directory separator character 514 */ 515 #if SQLITE_OS_WIN 516 # define DirSep(X) ((X)=='/'||(X)=='\\') 517 #else 518 # define DirSep(X) ((X)=='/') 519 #endif 520 521 /* 522 ** Attempt to load an SQLite extension library contained in the file 523 ** zFile. The entry point is zProc. zProc may be 0 in which case a 524 ** default entry point name (sqlite3_extension_init) is used. Use 525 ** of the default name is recommended. 526 ** 527 ** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong. 528 ** 529 ** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with 530 ** error message text. The calling function should free this memory 531 ** by calling sqlite3DbFree(db, ). 532 */ 533 static int sqlite3LoadExtension( 534 sqlite3 *db, /* Load the extension into this database connection */ 535 const char *zFile, /* Name of the shared library containing extension */ 536 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 537 char **pzErrMsg /* Put error message here if not 0 */ 538 ){ 539 sqlite3_vfs *pVfs = db->pVfs; 540 void *handle; 541 sqlite3_loadext_entry xInit; 542 char *zErrmsg = 0; 543 const char *zEntry; 544 char *zAltEntry = 0; 545 void **aHandle; 546 u64 nMsg = strlen(zFile); 547 int ii; 548 int rc; 549 550 /* Shared library endings to try if zFile cannot be loaded as written */ 551 static const char *azEndings[] = { 552 #if SQLITE_OS_WIN 553 "dll" 554 #elif defined(__APPLE__) 555 "dylib" 556 #else 557 "so" 558 #endif 559 }; 560 561 562 if( pzErrMsg ) *pzErrMsg = 0; 563 564 /* Ticket #1863. To avoid a creating security problems for older 565 ** applications that relink against newer versions of SQLite, the 566 ** ability to run load_extension is turned off by default. One 567 ** must call either sqlite3_enable_load_extension(db) or 568 ** sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, 1, 0) 569 ** to turn on extension loading. 570 */ 571 if( (db->flags & SQLITE_LoadExtension)==0 ){ 572 if( pzErrMsg ){ 573 *pzErrMsg = sqlite3_mprintf("not authorized"); 574 } 575 return SQLITE_ERROR; 576 } 577 578 zEntry = zProc ? zProc : "sqlite3_extension_init"; 579 580 /* tag-20210611-1. Some dlopen() implementations will segfault if given 581 ** an oversize filename. Most filesystems have a pathname limit of 4K, 582 ** so limit the extension filename length to about twice that. 583 ** https://sqlite.org/forum/forumpost/08a0d6d9bf */ 584 if( nMsg>SQLITE_MAX_PATHLEN ) goto extension_not_found; 585 586 handle = sqlite3OsDlOpen(pVfs, zFile); 587 #if SQLITE_OS_UNIX || SQLITE_OS_WIN 588 for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){ 589 char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]); 590 if( zAltFile==0 ) return SQLITE_NOMEM_BKPT; 591 handle = sqlite3OsDlOpen(pVfs, zAltFile); 592 sqlite3_free(zAltFile); 593 } 594 #endif 595 if( handle==0 ) goto extension_not_found; 596 xInit = (sqlite3_loadext_entry)sqlite3OsDlSym(pVfs, handle, zEntry); 597 598 /* If no entry point was specified and the default legacy 599 ** entry point name "sqlite3_extension_init" was not found, then 600 ** construct an entry point name "sqlite3_X_init" where the X is 601 ** replaced by the lowercase value of every ASCII alphabetic 602 ** character in the filename after the last "/" upto the first ".", 603 ** and eliding the first three characters if they are "lib". 604 ** Examples: 605 ** 606 ** /usr/local/lib/libExample5.4.3.so ==> sqlite3_example_init 607 ** C:/lib/mathfuncs.dll ==> sqlite3_mathfuncs_init 608 */ 609 if( xInit==0 && zProc==0 ){ 610 int iFile, iEntry, c; 611 int ncFile = sqlite3Strlen30(zFile); 612 zAltEntry = sqlite3_malloc64(ncFile+30); 613 if( zAltEntry==0 ){ 614 sqlite3OsDlClose(pVfs, handle); 615 return SQLITE_NOMEM_BKPT; 616 } 617 memcpy(zAltEntry, "sqlite3_", 8); 618 for(iFile=ncFile-1; iFile>=0 && !DirSep(zFile[iFile]); iFile--){} 619 iFile++; 620 if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3; 621 for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){ 622 if( sqlite3Isalpha(c) ){ 623 zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c]; 624 } 625 } 626 memcpy(zAltEntry+iEntry, "_init", 6); 627 zEntry = zAltEntry; 628 xInit = (sqlite3_loadext_entry)sqlite3OsDlSym(pVfs, handle, zEntry); 629 } 630 if( xInit==0 ){ 631 if( pzErrMsg ){ 632 nMsg += strlen(zEntry) + 300; 633 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 634 if( zErrmsg ){ 635 assert( nMsg<0x7fffffff ); /* zErrmsg would be NULL if not so */ 636 sqlite3_snprintf((int)nMsg, zErrmsg, 637 "no entry point [%s] in shared library [%s]", zEntry, zFile); 638 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 639 } 640 } 641 sqlite3OsDlClose(pVfs, handle); 642 sqlite3_free(zAltEntry); 643 return SQLITE_ERROR; 644 } 645 sqlite3_free(zAltEntry); 646 rc = xInit(db, &zErrmsg, &sqlite3Apis); 647 if( rc ){ 648 if( rc==SQLITE_OK_LOAD_PERMANENTLY ) return SQLITE_OK; 649 if( pzErrMsg ){ 650 *pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg); 651 } 652 sqlite3_free(zErrmsg); 653 sqlite3OsDlClose(pVfs, handle); 654 return SQLITE_ERROR; 655 } 656 657 /* Append the new shared library handle to the db->aExtension array. */ 658 aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1)); 659 if( aHandle==0 ){ 660 return SQLITE_NOMEM_BKPT; 661 } 662 if( db->nExtension>0 ){ 663 memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension); 664 } 665 sqlite3DbFree(db, db->aExtension); 666 db->aExtension = aHandle; 667 668 db->aExtension[db->nExtension++] = handle; 669 return SQLITE_OK; 670 671 extension_not_found: 672 if( pzErrMsg ){ 673 nMsg += 300; 674 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 675 if( zErrmsg ){ 676 assert( nMsg<0x7fffffff ); /* zErrmsg would be NULL if not so */ 677 sqlite3_snprintf((int)nMsg, zErrmsg, 678 "unable to open shared library [%.*s]", SQLITE_MAX_PATHLEN, zFile); 679 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 680 } 681 } 682 return SQLITE_ERROR; 683 } 684 int sqlite3_load_extension( 685 sqlite3 *db, /* Load the extension into this database connection */ 686 const char *zFile, /* Name of the shared library containing extension */ 687 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 688 char **pzErrMsg /* Put error message here if not 0 */ 689 ){ 690 int rc; 691 sqlite3_mutex_enter(db->mutex); 692 rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg); 693 rc = sqlite3ApiExit(db, rc); 694 sqlite3_mutex_leave(db->mutex); 695 return rc; 696 } 697 698 /* 699 ** Call this routine when the database connection is closing in order 700 ** to clean up loaded extensions 701 */ 702 void sqlite3CloseExtensions(sqlite3 *db){ 703 int i; 704 assert( sqlite3_mutex_held(db->mutex) ); 705 for(i=0; i<db->nExtension; i++){ 706 sqlite3OsDlClose(db->pVfs, db->aExtension[i]); 707 } 708 sqlite3DbFree(db, db->aExtension); 709 } 710 711 /* 712 ** Enable or disable extension loading. Extension loading is disabled by 713 ** default so as not to open security holes in older applications. 714 */ 715 int sqlite3_enable_load_extension(sqlite3 *db, int onoff){ 716 sqlite3_mutex_enter(db->mutex); 717 if( onoff ){ 718 db->flags |= SQLITE_LoadExtension|SQLITE_LoadExtFunc; 719 }else{ 720 db->flags &= ~(u64)(SQLITE_LoadExtension|SQLITE_LoadExtFunc); 721 } 722 sqlite3_mutex_leave(db->mutex); 723 return SQLITE_OK; 724 } 725 726 #endif /* !defined(SQLITE_OMIT_LOAD_EXTENSION) */ 727 728 /* 729 ** The following object holds the list of automatically loaded 730 ** extensions. 731 ** 732 ** This list is shared across threads. The SQLITE_MUTEX_STATIC_MAIN 733 ** mutex must be held while accessing this list. 734 */ 735 typedef struct sqlite3AutoExtList sqlite3AutoExtList; 736 static SQLITE_WSD struct sqlite3AutoExtList { 737 u32 nExt; /* Number of entries in aExt[] */ 738 void (**aExt)(void); /* Pointers to the extension init functions */ 739 } sqlite3Autoext = { 0, 0 }; 740 741 /* The "wsdAutoext" macro will resolve to the autoextension 742 ** state vector. If writable static data is unsupported on the target, 743 ** we have to locate the state vector at run-time. In the more common 744 ** case where writable static data is supported, wsdStat can refer directly 745 ** to the "sqlite3Autoext" state vector declared above. 746 */ 747 #ifdef SQLITE_OMIT_WSD 748 # define wsdAutoextInit \ 749 sqlite3AutoExtList *x = &GLOBAL(sqlite3AutoExtList,sqlite3Autoext) 750 # define wsdAutoext x[0] 751 #else 752 # define wsdAutoextInit 753 # define wsdAutoext sqlite3Autoext 754 #endif 755 756 757 /* 758 ** Register a statically linked extension that is automatically 759 ** loaded by every new database connection. 760 */ 761 int sqlite3_auto_extension( 762 void (*xInit)(void) 763 ){ 764 int rc = SQLITE_OK; 765 #ifndef SQLITE_OMIT_AUTOINIT 766 rc = sqlite3_initialize(); 767 if( rc ){ 768 return rc; 769 }else 770 #endif 771 { 772 u32 i; 773 #if SQLITE_THREADSAFE 774 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); 775 #endif 776 wsdAutoextInit; 777 sqlite3_mutex_enter(mutex); 778 for(i=0; i<wsdAutoext.nExt; i++){ 779 if( wsdAutoext.aExt[i]==xInit ) break; 780 } 781 if( i==wsdAutoext.nExt ){ 782 u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]); 783 void (**aNew)(void); 784 aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte); 785 if( aNew==0 ){ 786 rc = SQLITE_NOMEM_BKPT; 787 }else{ 788 wsdAutoext.aExt = aNew; 789 wsdAutoext.aExt[wsdAutoext.nExt] = xInit; 790 wsdAutoext.nExt++; 791 } 792 } 793 sqlite3_mutex_leave(mutex); 794 assert( (rc&0xff)==rc ); 795 return rc; 796 } 797 } 798 799 /* 800 ** Cancel a prior call to sqlite3_auto_extension. Remove xInit from the 801 ** set of routines that is invoked for each new database connection, if it 802 ** is currently on the list. If xInit is not on the list, then this 803 ** routine is a no-op. 804 ** 805 ** Return 1 if xInit was found on the list and removed. Return 0 if xInit 806 ** was not on the list. 807 */ 808 int sqlite3_cancel_auto_extension( 809 void (*xInit)(void) 810 ){ 811 #if SQLITE_THREADSAFE 812 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); 813 #endif 814 int i; 815 int n = 0; 816 wsdAutoextInit; 817 sqlite3_mutex_enter(mutex); 818 for(i=(int)wsdAutoext.nExt-1; i>=0; i--){ 819 if( wsdAutoext.aExt[i]==xInit ){ 820 wsdAutoext.nExt--; 821 wsdAutoext.aExt[i] = wsdAutoext.aExt[wsdAutoext.nExt]; 822 n++; 823 break; 824 } 825 } 826 sqlite3_mutex_leave(mutex); 827 return n; 828 } 829 830 /* 831 ** Reset the automatic extension loading mechanism. 832 */ 833 void sqlite3_reset_auto_extension(void){ 834 #ifndef SQLITE_OMIT_AUTOINIT 835 if( sqlite3_initialize()==SQLITE_OK ) 836 #endif 837 { 838 #if SQLITE_THREADSAFE 839 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); 840 #endif 841 wsdAutoextInit; 842 sqlite3_mutex_enter(mutex); 843 sqlite3_free(wsdAutoext.aExt); 844 wsdAutoext.aExt = 0; 845 wsdAutoext.nExt = 0; 846 sqlite3_mutex_leave(mutex); 847 } 848 } 849 850 /* 851 ** Load all automatic extensions. 852 ** 853 ** If anything goes wrong, set an error in the database connection. 854 */ 855 void sqlite3AutoLoadExtensions(sqlite3 *db){ 856 u32 i; 857 int go = 1; 858 int rc; 859 sqlite3_loadext_entry xInit; 860 861 wsdAutoextInit; 862 if( wsdAutoext.nExt==0 ){ 863 /* Common case: early out without every having to acquire a mutex */ 864 return; 865 } 866 for(i=0; go; i++){ 867 char *zErrmsg; 868 #if SQLITE_THREADSAFE 869 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN); 870 #endif 871 #ifdef SQLITE_OMIT_LOAD_EXTENSION 872 const sqlite3_api_routines *pThunk = 0; 873 #else 874 const sqlite3_api_routines *pThunk = &sqlite3Apis; 875 #endif 876 sqlite3_mutex_enter(mutex); 877 if( i>=wsdAutoext.nExt ){ 878 xInit = 0; 879 go = 0; 880 }else{ 881 xInit = (sqlite3_loadext_entry)wsdAutoext.aExt[i]; 882 } 883 sqlite3_mutex_leave(mutex); 884 zErrmsg = 0; 885 if( xInit && (rc = xInit(db, &zErrmsg, pThunk))!=0 ){ 886 sqlite3ErrorWithMsg(db, rc, 887 "automatic extension loading failed: %s", zErrmsg); 888 go = 0; 889 } 890 sqlite3_free(zErrmsg); 891 } 892 } 893