1/* crypto/engine/eng_dyn.c */ 2/* 3 * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project 4 * 2001. 5 */ 6/* ==================================================================== 7 * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60#include "eng_int.h" 61#include <openssl/dso.h> 62 63/* 64 * Shared libraries implementing ENGINEs for use by the "dynamic" ENGINE 65 * loader should implement the hook-up functions with the following 66 * prototypes. 67 */ 68 69/* Our ENGINE handlers */ 70static int dynamic_init(ENGINE *e); 71static int dynamic_finish(ENGINE *e); 72static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, 73 void (*f) (void)); 74/* Predeclare our context type */ 75typedef struct st_dynamic_data_ctx dynamic_data_ctx; 76/* The implementation for the important control command */ 77static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx); 78 79#define DYNAMIC_CMD_SO_PATH ENGINE_CMD_BASE 80#define DYNAMIC_CMD_NO_VCHECK (ENGINE_CMD_BASE + 1) 81#define DYNAMIC_CMD_ID (ENGINE_CMD_BASE + 2) 82#define DYNAMIC_CMD_LIST_ADD (ENGINE_CMD_BASE + 3) 83#define DYNAMIC_CMD_DIR_LOAD (ENGINE_CMD_BASE + 4) 84#define DYNAMIC_CMD_DIR_ADD (ENGINE_CMD_BASE + 5) 85#define DYNAMIC_CMD_LOAD (ENGINE_CMD_BASE + 6) 86 87/* The constants used when creating the ENGINE */ 88static const char *engine_dynamic_id = "dynamic"; 89static const char *engine_dynamic_name = "Dynamic engine loading support"; 90static const ENGINE_CMD_DEFN dynamic_cmd_defns[] = { 91 {DYNAMIC_CMD_SO_PATH, 92 "SO_PATH", 93 "Specifies the path to the new ENGINE shared library", 94 ENGINE_CMD_FLAG_STRING}, 95 {DYNAMIC_CMD_NO_VCHECK, 96 "NO_VCHECK", 97 "Specifies to continue even if version checking fails (boolean)", 98 ENGINE_CMD_FLAG_NUMERIC}, 99 {DYNAMIC_CMD_ID, 100 "ID", 101 "Specifies an ENGINE id name for loading", 102 ENGINE_CMD_FLAG_STRING}, 103 {DYNAMIC_CMD_LIST_ADD, 104 "LIST_ADD", 105 "Whether to add a loaded ENGINE to the internal list (0=no,1=yes,2=mandatory)", 106 ENGINE_CMD_FLAG_NUMERIC}, 107 {DYNAMIC_CMD_DIR_LOAD, 108 "DIR_LOAD", 109 "Specifies whether to load from 'DIR_ADD' directories (0=no,1=yes,2=mandatory)", 110 ENGINE_CMD_FLAG_NUMERIC}, 111 {DYNAMIC_CMD_DIR_ADD, 112 "DIR_ADD", 113 "Adds a directory from which ENGINEs can be loaded", 114 ENGINE_CMD_FLAG_STRING}, 115 {DYNAMIC_CMD_LOAD, 116 "LOAD", 117 "Load up the ENGINE specified by other settings", 118 ENGINE_CMD_FLAG_NO_INPUT}, 119 {0, NULL, NULL, 0} 120}; 121 122static const ENGINE_CMD_DEFN dynamic_cmd_defns_empty[] = { 123 {0, NULL, NULL, 0} 124}; 125 126/* 127 * Loading code stores state inside the ENGINE structure via the "ex_data" 128 * element. We load all our state into a single structure and use that as a 129 * single context in the "ex_data" stack. 130 */ 131struct st_dynamic_data_ctx { 132 /* The DSO object we load that supplies the ENGINE code */ 133 DSO *dynamic_dso; 134 /* 135 * The function pointer to the version checking shared library function 136 */ 137 dynamic_v_check_fn v_check; 138 /* 139 * The function pointer to the engine-binding shared library function 140 */ 141 dynamic_bind_engine bind_engine; 142 /* The default name/path for loading the shared library */ 143 const char *DYNAMIC_LIBNAME; 144 /* Whether to continue loading on a version check failure */ 145 int no_vcheck; 146 /* If non-NULL, stipulates the 'id' of the ENGINE to be loaded */ 147 const char *engine_id; 148 /* 149 * If non-zero, a successfully loaded ENGINE should be added to the 150 * internal ENGINE list. If 2, the add must succeed or the entire load 151 * should fail. 152 */ 153 int list_add_value; 154 /* The symbol name for the version checking function */ 155 const char *DYNAMIC_F1; 156 /* The symbol name for the "initialise ENGINE structure" function */ 157 const char *DYNAMIC_F2; 158 /* 159 * Whether to never use 'dirs', use 'dirs' as a fallback, or only use 160 * 'dirs' for loading. Default is to use 'dirs' as a fallback. 161 */ 162 int dir_load; 163 /* A stack of directories from which ENGINEs could be loaded */ 164 STACK *dirs; 165}; 166 167/* 168 * This is the "ex_data" index we obtain and reserve for use with our context 169 * structure. 170 */ 171static int dynamic_ex_data_idx = -1; 172 173static void int_free_str(void *s) 174{ 175 OPENSSL_free(s); 176} 177 178/* 179 * Because our ex_data element may or may not get allocated depending on 180 * whether a "first-use" occurs before the ENGINE is freed, we have a memory 181 * leak problem to solve. We can't declare a "new" handler for the ex_data as 182 * we don't want a dynamic_data_ctx in *all* ENGINE structures of all types 183 * (this is a bug in the design of CRYPTO_EX_DATA). As such, we just declare 184 * a "free" handler and that will get called if an ENGINE is being destroyed 185 * and there was an ex_data element corresponding to our context type. 186 */ 187static void dynamic_data_ctx_free_func(void *parent, void *ptr, 188 CRYPTO_EX_DATA *ad, int idx, long argl, 189 void *argp) 190{ 191 if (ptr) { 192 dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr; 193 if (ctx->dynamic_dso) 194 DSO_free(ctx->dynamic_dso); 195 if (ctx->DYNAMIC_LIBNAME) 196 OPENSSL_free((void *)ctx->DYNAMIC_LIBNAME); 197 if (ctx->engine_id) 198 OPENSSL_free((void *)ctx->engine_id); 199 if (ctx->dirs) 200 sk_pop_free(ctx->dirs, int_free_str); 201 OPENSSL_free(ctx); 202 } 203} 204 205/* 206 * Construct the per-ENGINE context. We create it blindly and then use a lock 207 * to check for a race - if so, all but one of the threads "racing" will have 208 * wasted their time. The alternative involves creating everything inside the 209 * lock which is far worse. 210 */ 211static int dynamic_set_data_ctx(ENGINE *e, dynamic_data_ctx **ctx) 212{ 213 dynamic_data_ctx *c; 214 c = OPENSSL_malloc(sizeof(dynamic_data_ctx)); 215 if (!c) { 216 ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE); 217 return 0; 218 } 219 memset(c, 0, sizeof(dynamic_data_ctx)); 220 c->dynamic_dso = NULL; 221 c->v_check = NULL; 222 c->bind_engine = NULL; 223 c->DYNAMIC_LIBNAME = NULL; 224 c->no_vcheck = 0; 225 c->engine_id = NULL; 226 c->list_add_value = 0; 227 c->DYNAMIC_F1 = "v_check"; 228 c->DYNAMIC_F2 = "bind_engine"; 229 c->dir_load = 1; 230 c->dirs = sk_new_null(); 231 if (!c->dirs) { 232 ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE); 233 OPENSSL_free(c); 234 return 0; 235 } 236 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE); 237 if ((*ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, 238 dynamic_ex_data_idx)) 239 == NULL) { 240 /* Good, we're the first */ 241 ENGINE_set_ex_data(e, dynamic_ex_data_idx, c); 242 *ctx = c; 243 c = NULL; 244 } 245 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE); 246 /* 247 * If we lost the race to set the context, c is non-NULL and *ctx is the 248 * context of the thread that won. 249 */ 250 if (c) 251 OPENSSL_free(c); 252 return 1; 253} 254 255/* 256 * This function retrieves the context structure from an ENGINE's "ex_data", 257 * or if it doesn't exist yet, sets it up. 258 */ 259static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e) 260{ 261 dynamic_data_ctx *ctx; 262 if (dynamic_ex_data_idx < 0) { 263 /* 264 * Create and register the ENGINE ex_data, and associate our "free" 265 * function with it to ensure any allocated contexts get freed when 266 * an ENGINE goes underground. 267 */ 268 int new_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL, 269 dynamic_data_ctx_free_func); 270 if (new_idx == -1) { 271 ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX, ENGINE_R_NO_INDEX); 272 return NULL; 273 } 274 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE); 275 /* Avoid a race by checking again inside this lock */ 276 if (dynamic_ex_data_idx < 0) { 277 /* Good, someone didn't beat us to it */ 278 dynamic_ex_data_idx = new_idx; 279 new_idx = -1; 280 } 281 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE); 282 /* 283 * In theory we could "give back" the index here if (new_idx>-1), but 284 * it's not possible and wouldn't gain us much if it were. 285 */ 286 } 287 ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, dynamic_ex_data_idx); 288 /* Check if the context needs to be created */ 289 if ((ctx == NULL) && !dynamic_set_data_ctx(e, &ctx)) 290 /* "set_data" will set errors if necessary */ 291 return NULL; 292 return ctx; 293} 294 295static ENGINE *engine_dynamic(void) 296{ 297 ENGINE *ret = ENGINE_new(); 298 if (!ret) 299 return NULL; 300 if (!ENGINE_set_id(ret, engine_dynamic_id) || 301 !ENGINE_set_name(ret, engine_dynamic_name) || 302 !ENGINE_set_init_function(ret, dynamic_init) || 303 !ENGINE_set_finish_function(ret, dynamic_finish) || 304 !ENGINE_set_ctrl_function(ret, dynamic_ctrl) || 305 !ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) || 306 !ENGINE_set_cmd_defns(ret, dynamic_cmd_defns)) { 307 ENGINE_free(ret); 308 return NULL; 309 } 310 return ret; 311} 312 313void ENGINE_load_dynamic(void) 314{ 315 ENGINE *toadd = engine_dynamic(); 316 if (!toadd) 317 return; 318 ENGINE_add(toadd); 319 /* 320 * If the "add" worked, it gets a structural reference. So either way, we 321 * release our just-created reference. 322 */ 323 ENGINE_free(toadd); 324 /* 325 * If the "add" didn't work, it was probably a conflict because it was 326 * already added (eg. someone calling ENGINE_load_blah then calling 327 * ENGINE_load_builtin_engines() perhaps). 328 */ 329 ERR_clear_error(); 330} 331 332static int dynamic_init(ENGINE *e) 333{ 334 /* 335 * We always return failure - the "dyanamic" engine itself can't be used 336 * for anything. 337 */ 338 return 0; 339} 340 341static int dynamic_finish(ENGINE *e) 342{ 343 /* 344 * This should never be called on account of "dynamic_init" always 345 * failing. 346 */ 347 return 0; 348} 349 350static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void)) 351{ 352 dynamic_data_ctx *ctx = dynamic_get_data_ctx(e); 353 int initialised; 354 355 if (!ctx) { 356 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_NOT_LOADED); 357 return 0; 358 } 359 initialised = ((ctx->dynamic_dso == NULL) ? 0 : 1); 360 /* All our control commands require the ENGINE to be uninitialised */ 361 if (initialised) { 362 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_ALREADY_LOADED); 363 return 0; 364 } 365 switch (cmd) { 366 case DYNAMIC_CMD_SO_PATH: 367 /* a NULL 'p' or a string of zero-length is the same thing */ 368 if (p && (strlen((const char *)p) < 1)) 369 p = NULL; 370 if (ctx->DYNAMIC_LIBNAME) 371 OPENSSL_free((void *)ctx->DYNAMIC_LIBNAME); 372 if (p) 373 ctx->DYNAMIC_LIBNAME = BUF_strdup(p); 374 else 375 ctx->DYNAMIC_LIBNAME = NULL; 376 return (ctx->DYNAMIC_LIBNAME ? 1 : 0); 377 case DYNAMIC_CMD_NO_VCHECK: 378 ctx->no_vcheck = ((i == 0) ? 0 : 1); 379 return 1; 380 case DYNAMIC_CMD_ID: 381 /* a NULL 'p' or a string of zero-length is the same thing */ 382 if (p && (strlen((const char *)p) < 1)) 383 p = NULL; 384 if (ctx->engine_id) 385 OPENSSL_free((void *)ctx->engine_id); 386 if (p) 387 ctx->engine_id = BUF_strdup(p); 388 else 389 ctx->engine_id = NULL; 390 return (ctx->engine_id ? 1 : 0); 391 case DYNAMIC_CMD_LIST_ADD: 392 if ((i < 0) || (i > 2)) { 393 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); 394 return 0; 395 } 396 ctx->list_add_value = (int)i; 397 return 1; 398 case DYNAMIC_CMD_LOAD: 399 return dynamic_load(e, ctx); 400 case DYNAMIC_CMD_DIR_LOAD: 401 if ((i < 0) || (i > 2)) { 402 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); 403 return 0; 404 } 405 ctx->dir_load = (int)i; 406 return 1; 407 case DYNAMIC_CMD_DIR_ADD: 408 /* a NULL 'p' or a string of zero-length is the same thing */ 409 if (!p || (strlen((const char *)p) < 1)) { 410 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); 411 return 0; 412 } 413 { 414 char *tmp_str = BUF_strdup(p); 415 if (!tmp_str) { 416 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ERR_R_MALLOC_FAILURE); 417 return 0; 418 } 419 sk_insert(ctx->dirs, tmp_str, -1); 420 } 421 return 1; 422 default: 423 break; 424 } 425 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED); 426 return 0; 427} 428 429static int int_load(dynamic_data_ctx *ctx) 430{ 431 int num, loop; 432 /* Unless told not to, try a direct load */ 433 if ((ctx->dir_load != 2) && (DSO_load(ctx->dynamic_dso, 434 ctx->DYNAMIC_LIBNAME, NULL, 435 0)) != NULL) 436 return 1; 437 /* If we're not allowed to use 'dirs' or we have none, fail */ 438 if (!ctx->dir_load || ((num = sk_num(ctx->dirs)) < 1)) 439 return 0; 440 for (loop = 0; loop < num; loop++) { 441 const char *s = sk_value(ctx->dirs, loop); 442 char *merge = DSO_merge(ctx->dynamic_dso, ctx->DYNAMIC_LIBNAME, s); 443 if (!merge) 444 return 0; 445 if (DSO_load(ctx->dynamic_dso, merge, NULL, 0)) { 446 /* Found what we're looking for */ 447 OPENSSL_free(merge); 448 return 1; 449 } 450 OPENSSL_free(merge); 451 } 452 return 0; 453} 454 455static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx) 456{ 457 ENGINE cpy; 458 dynamic_fns fns; 459 460 if (!ctx->dynamic_dso) 461 ctx->dynamic_dso = DSO_new(); 462 if (!ctx->DYNAMIC_LIBNAME) { 463 if (!ctx->engine_id) 464 return 0; 465 ctx->DYNAMIC_LIBNAME = 466 DSO_convert_filename(ctx->dynamic_dso, ctx->engine_id); 467 } 468 if (!int_load(ctx)) { 469 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_NOT_FOUND); 470 DSO_free(ctx->dynamic_dso); 471 ctx->dynamic_dso = NULL; 472 return 0; 473 } 474 /* We have to find a bind function otherwise it'll always end badly */ 475 if (! 476 (ctx->bind_engine = 477 (dynamic_bind_engine) DSO_bind_func(ctx->dynamic_dso, 478 ctx->DYNAMIC_F2))) { 479 ctx->bind_engine = NULL; 480 DSO_free(ctx->dynamic_dso); 481 ctx->dynamic_dso = NULL; 482 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_FAILURE); 483 return 0; 484 } 485 /* Do we perform version checking? */ 486 if (!ctx->no_vcheck) { 487 unsigned long vcheck_res = 0; 488 /* 489 * Now we try to find a version checking function and decide how to 490 * cope with failure if/when it fails. 491 */ 492 ctx->v_check = 493 (dynamic_v_check_fn) DSO_bind_func(ctx->dynamic_dso, 494 ctx->DYNAMIC_F1); 495 if (ctx->v_check) 496 vcheck_res = ctx->v_check(OSSL_DYNAMIC_VERSION); 497 /* 498 * We fail if the version checker veto'd the load *or* if it is 499 * deferring to us (by returning its version) and we think it is too 500 * old. 501 */ 502 if (vcheck_res < OSSL_DYNAMIC_OLDEST) { 503 /* Fail */ 504 ctx->bind_engine = NULL; 505 ctx->v_check = NULL; 506 DSO_free(ctx->dynamic_dso); 507 ctx->dynamic_dso = NULL; 508 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, 509 ENGINE_R_VERSION_INCOMPATIBILITY); 510 return 0; 511 } 512 } 513 /* 514 * First binary copy the ENGINE structure so that we can roll back if the 515 * hand-over fails 516 */ 517 memcpy(&cpy, e, sizeof(ENGINE)); 518 /* 519 * Provide the ERR, "ex_data", memory, and locking callbacks so the 520 * loaded library uses our state rather than its own. FIXME: As noted in 521 * engine.h, much of this would be simplified if each area of code 522 * provided its own "summary" structure of all related callbacks. It 523 * would also increase opaqueness. 524 */ 525 fns.static_state = ENGINE_get_static_state(); 526 fns.err_fns = ERR_get_implementation(); 527 fns.ex_data_fns = CRYPTO_get_ex_data_implementation(); 528 CRYPTO_get_mem_functions(&fns.mem_fns.malloc_cb, 529 &fns.mem_fns.realloc_cb, &fns.mem_fns.free_cb); 530 fns.lock_fns.lock_locking_cb = CRYPTO_get_locking_callback(); 531 fns.lock_fns.lock_add_lock_cb = CRYPTO_get_add_lock_callback(); 532 fns.lock_fns.dynlock_create_cb = CRYPTO_get_dynlock_create_callback(); 533 fns.lock_fns.dynlock_lock_cb = CRYPTO_get_dynlock_lock_callback(); 534 fns.lock_fns.dynlock_destroy_cb = CRYPTO_get_dynlock_destroy_callback(); 535 /* 536 * Now that we've loaded the dynamic engine, make sure no "dynamic" 537 * ENGINE elements will show through. 538 */ 539 engine_set_all_null(e); 540 541 /* Try to bind the ENGINE onto our own ENGINE structure */ 542 if (!ctx->bind_engine(e, ctx->engine_id, &fns)) { 543 ctx->bind_engine = NULL; 544 ctx->v_check = NULL; 545 DSO_free(ctx->dynamic_dso); 546 ctx->dynamic_dso = NULL; 547 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_INIT_FAILED); 548 /* Copy the original ENGINE structure back */ 549 memcpy(e, &cpy, sizeof(ENGINE)); 550 return 0; 551 } 552 /* Do we try to add this ENGINE to the internal list too? */ 553 if (ctx->list_add_value > 0) { 554 if (!ENGINE_add(e)) { 555 /* Do we tolerate this or fail? */ 556 if (ctx->list_add_value > 1) { 557 /* 558 * Fail - NB: By this time, it's too late to rollback, and 559 * trying to do so allows the bind_engine() code to have 560 * created leaks. We just have to fail where we are, after 561 * the ENGINE has changed. 562 */ 563 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, 564 ENGINE_R_CONFLICTING_ENGINE_ID); 565 return 0; 566 } 567 /* Tolerate */ 568 ERR_clear_error(); 569 } 570 } 571 return 1; 572} 573