1 /* crypto/engine/eng_dyn.c */

     2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL

     3  * project 2001.

     4  */

     5 /* ====================================================================

     6  * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.

     7  *

     8  * Redistribution and use in source and binary forms, with or without

     9  * modification, are permitted provided that the following conditions

    10  * are met:

    11  *

    12  * 1. Redistributions of source code must retain the above copyright

    13  *    notice, this list of conditions and the following disclaimer. 

    14  *

    15  * 2. Redistributions in binary form must reproduce the above copyright

    16  *    notice, this list of conditions and the following disclaimer in

    17  *    the documentation and/or other materials provided with the

    18  *    distribution.

    19  *

    20  * 3. All advertising materials mentioning features or use of this

    21  *    software must display the following acknowledgment:

    22  *    "This product includes software developed by the OpenSSL Project

    23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

    24  *

    25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

    26  *    endorse or promote products derived from this software without

    27  *    prior written permission. For written permission, please contact

    28  *    licensing@OpenSSL.org.

    29  *

    30  * 5. Products derived from this software may not be called "OpenSSL"

    31  *    nor may "OpenSSL" appear in their names without prior written

    32  *    permission of the OpenSSL Project.

    33  *

    34  * 6. Redistributions of any form whatsoever must retain the following

    35  *    acknowledgment:

    36  *    "This product includes software developed by the OpenSSL Project

    37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

    38  *

    39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

    40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

    43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

    45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

    48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

    50  * OF THE POSSIBILITY OF SUCH DAMAGE.

    51  * ====================================================================

    52  *

    53  * This product includes cryptographic software written by Eric Young

    54  * (eay@cryptsoft.com).  This product includes software written by Tim

    55  * Hudson (tjh@cryptsoft.com).

    56  *

    57  */

    58 

    59 /*

    60  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

    61  */

    62 

    63 

    64 #include "eng_int.h"

    65 #include <openssl/dso.h>

    66 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

    67 #include "libcrypto_wsd_macros.h"

    68 #include "libcrypto_wsd.h"

    69 #endif

    70 

    71 /* Shared libraries implementing ENGINEs for use by the "dynamic" ENGINE loader

    72  * should implement the hook-up functions with the following prototypes. */

    73 

    74 /* Our ENGINE handlers */

    75 static int dynamic_init(ENGINE *e);

    76 static int dynamic_finish(ENGINE *e);

    77 static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));

    78 /* Predeclare our context type */

    79 typedef struct st_dynamic_data_ctx dynamic_data_ctx;

    80 /* The implementation for the important control command */

    81 static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx);

    82 

    83 #define DYNAMIC_CMD_SO_PATH		ENGINE_CMD_BASE

    84 #define DYNAMIC_CMD_NO_VCHECK		(ENGINE_CMD_BASE + 1)

    85 #define DYNAMIC_CMD_ID			(ENGINE_CMD_BASE + 2)

    86 #define DYNAMIC_CMD_LIST_ADD		(ENGINE_CMD_BASE + 3)

    87 #define DYNAMIC_CMD_DIR_LOAD		(ENGINE_CMD_BASE + 4)

    88 #define DYNAMIC_CMD_DIR_ADD		(ENGINE_CMD_BASE + 5)

    89 #define DYNAMIC_CMD_LOAD		(ENGINE_CMD_BASE + 6)

    90 

    91 /* The constants used when creating the ENGINE */

    92 #ifndef EMULATOR

    93 static const char *engine_dynamic_id = "dynamic";

    94 static const char *engine_dynamic_name = "Dynamic engine loading support";

    95 #else

    96 static const char *const engine_dynamic_id = "dynamic";

    97 static const char *const engine_dynamic_name = "Dynamic engine loading support";

    98 #endif

    99 static const ENGINE_CMD_DEFN dynamic_cmd_defns[] = {

   100 	{DYNAMIC_CMD_SO_PATH,

   101 		"SO_PATH",

   102 		"Specifies the path to the new ENGINE shared library",

   103 		ENGINE_CMD_FLAG_STRING},

   104 	{DYNAMIC_CMD_NO_VCHECK,

   105 		"NO_VCHECK",

   106 		"Specifies to continue even if version checking fails (boolean)",

   107 		ENGINE_CMD_FLAG_NUMERIC},

   108 	{DYNAMIC_CMD_ID,

   109 		"ID",

   110 		"Specifies an ENGINE id name for loading",

   111 		ENGINE_CMD_FLAG_STRING},

   112 	{DYNAMIC_CMD_LIST_ADD,

   113 		"LIST_ADD",

   114 		"Whether to add a loaded ENGINE to the internal list (0=no,1=yes,2=mandatory)",

   115 		ENGINE_CMD_FLAG_NUMERIC},

   116 	{DYNAMIC_CMD_DIR_LOAD,

   117 		"DIR_LOAD",

   118 		"Specifies whether to load from 'DIR_ADD' directories (0=no,1=yes,2=mandatory)",

   119 		ENGINE_CMD_FLAG_NUMERIC},

   120 	{DYNAMIC_CMD_DIR_ADD,

   121 		"DIR_ADD",

   122 		"Adds a directory from which ENGINEs can be loaded",

   123 		ENGINE_CMD_FLAG_STRING},

   124 	{DYNAMIC_CMD_LOAD,

   125 		"LOAD",

   126 		"Load up the ENGINE specified by other settings",

   127 		ENGINE_CMD_FLAG_NO_INPUT},

   128 	{0, NULL, NULL, 0}

   129 	};

   130 static const ENGINE_CMD_DEFN dynamic_cmd_defns_empty[] = {

   131 	{0, NULL, NULL, 0}

   132 	};

   133 

   134 /* Loading code stores state inside the ENGINE structure via the "ex_data"

   135  * element. We load all our state into a single structure and use that as a

   136  * single context in the "ex_data" stack. */

   137 struct st_dynamic_data_ctx

   138 	{

   139 	/* The DSO object we load that supplies the ENGINE code */

   140 	DSO *dynamic_dso;

   141 	/* The function pointer to the version checking shared library function */

   142 	dynamic_v_check_fn v_check;

   143 	/* The function pointer to the engine-binding shared library function */

   144 	dynamic_bind_engine bind_engine;

   145 	/* The default name/path for loading the shared library */

   146 	const char *DYNAMIC_LIBNAME;

   147 	/* Whether to continue loading on a version check failure */

   148 	int no_vcheck;

   149 	/* If non-NULL, stipulates the 'id' of the ENGINE to be loaded */

   150 	const char *engine_id;

   151 	/* If non-zero, a successfully loaded ENGINE should be added to the internal

   152 	 * ENGINE list. If 2, the add must succeed or the entire load should fail. */

   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 	/* Whether to never use 'dirs', use 'dirs' as a fallback, or only use

   159 	 * 'dirs' for loading. Default is to use 'dirs' as a fallback. */

   160 	int dir_load;

   161 	/* A stack of directories from which ENGINEs could be loaded */

   162 	STACK *dirs;

   163 	};

   164 

   165 /* This is the "ex_data" index we obtain and reserve for use with our context

   166  * structure. */

   167 #ifndef EMULATOR 

   168 static int dynamic_ex_data_idx = -1;

   169 #else

   170 GET_STATIC_VAR_FROM_TLS(dynamic_ex_data_idx,eng_dyn,int)

   171 #define dynamic_ex_data_idx (*GET_WSD_VAR_NAME(dynamic_ex_data_idx,eng_dyn, s)())

   172 #endif

   173 

   174 static void int_free_str(void *s) { OPENSSL_free(s); }

   175 /* Because our ex_data element may or may not get allocated depending on whether

   176  * a "first-use" occurs before the ENGINE is freed, we have a memory leak

   177  * problem to solve. We can't declare a "new" handler for the ex_data as we

   178  * don't want a dynamic_data_ctx in *all* ENGINE structures of all types (this

   179  * is a bug in the design of CRYPTO_EX_DATA). As such, we just declare a "free"

   180  * handler and that will get called if an ENGINE is being destroyed and there

   181  * was an ex_data element corresponding to our context type. */

   182 static void dynamic_data_ctx_free_func(void *parent, void *ptr,

   183 			CRYPTO_EX_DATA *ad, int idx, long argl, void *argp)

   184 	{

   185 	if(ptr)

   186 		{

   187 		dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr;

   188 		if(ctx->dynamic_dso)

   189 			DSO_free(ctx->dynamic_dso);

   190 		if(ctx->DYNAMIC_LIBNAME)

   191 			OPENSSL_free((void*)ctx->DYNAMIC_LIBNAME);

   192 		if(ctx->engine_id)

   193 			OPENSSL_free((void*)ctx->engine_id);

   194 		if(ctx->dirs)

   195 			sk_pop_free(ctx->dirs, int_free_str);

   196 		OPENSSL_free(ctx);

   197 		}

   198 	}

   199 

   200 /* Construct the per-ENGINE context. We create it blindly and then use a lock to

   201  * check for a race - if so, all but one of the threads "racing" will have

   202  * wasted their time. The alternative involves creating everything inside the

   203  * lock which is far worse. */

   204 static int dynamic_set_data_ctx(ENGINE *e, dynamic_data_ctx **ctx)

   205 	{

   206 	dynamic_data_ctx *c;

   207 	c = OPENSSL_malloc(sizeof(dynamic_data_ctx));

   208 	if(!c)

   209 		{

   210 		ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX,ERR_R_MALLOC_FAILURE);

   211 		return 0;

   212 		}

   213 	memset(c, 0, sizeof(dynamic_data_ctx));

   214 	c->dynamic_dso = NULL;

   215 	c->v_check = NULL;

   216 	c->bind_engine = NULL;

   217 	c->DYNAMIC_LIBNAME = NULL;

   218 	c->no_vcheck = 0;

   219 	c->engine_id = NULL;

   220 	c->list_add_value = 0;

   221 	c->DYNAMIC_F1 = "v_check";

   222 	c->DYNAMIC_F2 = "bind_engine";

   223 	c->dir_load = 1;

   224 	c->dirs = sk_new_null();

   225 	if(!c->dirs)

   226 		{

   227 		ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX,ERR_R_MALLOC_FAILURE);

   228 		OPENSSL_free(c);

   229 		return 0;

   230 		}

   231 	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);

   232 	if((*ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e,

   233 				dynamic_ex_data_idx)) == NULL)

   234 		{

   235 		/* Good, we're the first */

   236 		ENGINE_set_ex_data(e, dynamic_ex_data_idx, c);

   237 		*ctx = c;

   238 		c = NULL;

   239 		}

   240 	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

   241 	/* If we lost the race to set the context, c is non-NULL and *ctx is the

   242 	 * context of the thread that won. */

   243 	if(c)

   244 		OPENSSL_free(c);

   245 	return 1;

   246 	}

   247 

   248 /* This function retrieves the context structure from an ENGINE's "ex_data", or

   249  * if it doesn't exist yet, sets it up. */

   250 static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e)

   251 	{

   252 	dynamic_data_ctx *ctx;

   253 	if(dynamic_ex_data_idx < 0)

   254 		{

   255 		/* Create and register the ENGINE ex_data, and associate our

   256 		 * "free" function with it to ensure any allocated contexts get

   257 		 * freed when an ENGINE goes underground. */

   258 		int new_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL,

   259 					dynamic_data_ctx_free_func);

   260 		if(new_idx == -1)

   261 			{

   262 			ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX,ENGINE_R_NO_INDEX);

   263 			return NULL;

   264 			}

   265 		CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);

   266 		/* Avoid a race by checking again inside this lock */

   267 		if(dynamic_ex_data_idx < 0)

   268 			{

   269 			/* Good, someone didn't beat us to it */

   270 			dynamic_ex_data_idx = new_idx;

   271 			new_idx = -1;

   272 			}

   273 		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

   274 		/* In theory we could "give back" the index here if

   275 		 * (new_idx>-1), but it's not possible and wouldn't gain us much

   276 		 * if it were. */

   277 		}

   278 	ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, dynamic_ex_data_idx);

   279 	/* Check if the context needs to be created */

   280 	if((ctx == NULL) && !dynamic_set_data_ctx(e, &ctx))

   281 		/* "set_data" will set errors if necessary */

   282 		return NULL;

   283 	return ctx;

   284 	}

   285 

   286 static ENGINE *engine_dynamic(void)

   287 	{

   288 	ENGINE *ret = ENGINE_new();

   289 	if(!ret)

   290 		return NULL;

   291 	if(!ENGINE_set_id(ret, engine_dynamic_id) ||

   292 			!ENGINE_set_name(ret, engine_dynamic_name) ||

   293 			!ENGINE_set_init_function(ret, dynamic_init) ||

   294 			!ENGINE_set_finish_function(ret, dynamic_finish) ||

   295 			!ENGINE_set_ctrl_function(ret, dynamic_ctrl) ||

   296 			!ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) ||

   297 			!ENGINE_set_cmd_defns(ret, dynamic_cmd_defns))

   298 		{

   299 		ENGINE_free(ret);

   300 		return NULL;

   301 		}

   302 	return ret;

   303 	}

   304 

   305 EXPORT_C void ENGINE_load_dynamic(void)

   306 	{

   307 	ENGINE *toadd = engine_dynamic();

   308 	if(!toadd) return;

   309 	ENGINE_add(toadd);

   310 	/* If the "add" worked, it gets a structural reference. So either way,

   311 	 * we release our just-created reference. */

   312 	ENGINE_free(toadd);

   313 	/* If the "add" didn't work, it was probably a conflict because it was

   314 	 * already added (eg. someone calling ENGINE_load_blah then calling

   315 	 * ENGINE_load_builtin_engines() perhaps). */

   316 	ERR_clear_error();

   317 	}

   318 

   319 static int dynamic_init(ENGINE *e)

   320 	{

   321 	/* We always return failure - the "dyanamic" engine itself can't be used

   322 	 * for anything. */

   323 	return 0;

   324 	}

   325 

   326 static int dynamic_finish(ENGINE *e)

   327 	{

   328 	/* This should never be called on account of "dynamic_init" always

   329 	 * failing. */

   330 	return 0;

   331 	}

   332 

   333 static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))

   334 	{

   335 	dynamic_data_ctx *ctx = dynamic_get_data_ctx(e);

   336 	int initialised;

   337 	

   338 	if(!ctx)

   339 		{

   340 		ENGINEerr(ENGINE_F_DYNAMIC_CTRL,ENGINE_R_NOT_LOADED);

   341 		return 0;

   342 		}

   343 	initialised = ((ctx->dynamic_dso == NULL) ? 0 : 1);

   344 	/* All our control commands require the ENGINE to be uninitialised */

   345 	if(initialised)

   346 		{

   347 		ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

   348 			ENGINE_R_ALREADY_LOADED);

   349 		return 0;

   350 		}

   351 	switch(cmd)

   352 		{

   353 	case DYNAMIC_CMD_SO_PATH:

   354 		/* a NULL 'p' or a string of zero-length is the same thing */

   355 		if(p && (strlen((const char *)p) < 1))

   356 			p = NULL;

   357 		if(ctx->DYNAMIC_LIBNAME)

   358 			OPENSSL_free((void*)ctx->DYNAMIC_LIBNAME);

   359 		if(p)

   360 			ctx->DYNAMIC_LIBNAME = BUF_strdup(p);

   361 		else

   362 			ctx->DYNAMIC_LIBNAME = NULL;

   363 		return (ctx->DYNAMIC_LIBNAME ? 1 : 0);

   364 	case DYNAMIC_CMD_NO_VCHECK:

   365 		ctx->no_vcheck = ((i == 0) ? 0 : 1);

   366 		return 1;

   367 	case DYNAMIC_CMD_ID:

   368 		/* a NULL 'p' or a string of zero-length is the same thing */

   369 		if(p && (strlen((const char *)p) < 1))

   370 			p = NULL;

   371 		if(ctx->engine_id)

   372 			OPENSSL_free((void*)ctx->engine_id);

   373 		if(p)

   374 			ctx->engine_id = BUF_strdup(p);

   375 		else

   376 			ctx->engine_id = NULL;

   377 		return (ctx->engine_id ? 1 : 0);

   378 	case DYNAMIC_CMD_LIST_ADD:

   379 		if((i < 0) || (i > 2))

   380 			{

   381 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

   382 				ENGINE_R_INVALID_ARGUMENT);

   383 			return 0;

   384 			}

   385 		ctx->list_add_value = (int)i;

   386 		return 1;

   387 	case DYNAMIC_CMD_LOAD:

   388 		return dynamic_load(e, ctx);

   389 	case DYNAMIC_CMD_DIR_LOAD:

   390 		if((i < 0) || (i > 2))

   391 			{

   392 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

   393 				ENGINE_R_INVALID_ARGUMENT);

   394 			return 0;

   395 			}

   396 		ctx->dir_load = (int)i;

   397 		return 1;

   398 	case DYNAMIC_CMD_DIR_ADD:

   399 		/* a NULL 'p' or a string of zero-length is the same thing */

   400 		if(!p || (strlen((const char *)p) < 1))

   401 			{

   402 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

   403 				ENGINE_R_INVALID_ARGUMENT);

   404 			return 0;

   405 			}

   406 		{

   407 		char *tmp_str = BUF_strdup(p);

   408 		if(!tmp_str)

   409 			{

   410 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

   411 				ERR_R_MALLOC_FAILURE);

   412 			return 0;

   413 			}

   414 		sk_insert(ctx->dirs, tmp_str, -1);

   415 		}

   416 		return 1;

   417 	default:

   418 		break;

   419 		}

   420 	ENGINEerr(ENGINE_F_DYNAMIC_CTRL,ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);

   421 	return 0;

   422 	}

   423 

   424 static int int_load(dynamic_data_ctx *ctx)

   425 	{

   426 	int num, loop;

   427 	/* Unless told not to, try a direct load */

   428 	if((ctx->dir_load != 2) && (DSO_load(ctx->dynamic_dso,

   429 				ctx->DYNAMIC_LIBNAME, NULL, 0)) != NULL)

   430 		return 1;

   431 	/* If we're not allowed to use 'dirs' or we have none, fail */

   432 	if(!ctx->dir_load || ((num = sk_num(ctx->dirs)) < 1))

   433 		return 0;

   434 	for(loop = 0; loop < num; loop++)

   435 		{

   436 		const char *s = sk_value(ctx->dirs, loop);

   437 		char *merge = DSO_merge(ctx->dynamic_dso, ctx->DYNAMIC_LIBNAME, s);

   438 		if(!merge)

   439 			return 0;

   440 		if(DSO_load(ctx->dynamic_dso, merge, NULL, 0))

   441 			{

   442 			/* Found what we're looking for */

   443 			OPENSSL_free(merge);

   444 			return 1;

   445 			}

   446 		OPENSSL_free(merge);

   447 		}

   448 	return 0;

   449 	}

   450 

   451 static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx)

   452 	{

   453 	ENGINE cpy;

   454 	dynamic_fns fns;

   455 

   456 	if(!ctx->dynamic_dso)

   457 		ctx->dynamic_dso = DSO_new();

   458 	if(!ctx->DYNAMIC_LIBNAME)

   459 		{

   460 		if(!ctx->engine_id)

   461 			return 0;

   462 		ctx->DYNAMIC_LIBNAME =

   463 			DSO_convert_filename(ctx->dynamic_dso, ctx->engine_id);

   464 		}

   465 	if(!int_load(ctx))

   466 		{

   467 		ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

   468 			ENGINE_R_DSO_NOT_FOUND);

   469 		DSO_free(ctx->dynamic_dso);

   470 		ctx->dynamic_dso = NULL;

   471 		return 0;

   472 		}

   473 	/* We have to find a bind function otherwise it'll always end badly */

   474 	if(!(ctx->bind_engine = (dynamic_bind_engine)DSO_bind_func(

   475 					ctx->dynamic_dso, ctx->DYNAMIC_F2)))

   476 		{

   477 		ctx->bind_engine = NULL;

   478 		DSO_free(ctx->dynamic_dso);

   479 		ctx->dynamic_dso = NULL;

   480 		ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

   481 			ENGINE_R_DSO_FAILURE);

   482 		return 0;

   483 		}

   484 	/* Do we perform version checking? */

   485 	if(!ctx->no_vcheck)

   486 		{

   487 		unsigned long vcheck_res = 0;

   488 		/* Now we try to find a version checking function and decide how

   489 		 * to cope with failure if/when it fails. */

   490 		ctx->v_check = (dynamic_v_check_fn)DSO_bind_func(

   491 				ctx->dynamic_dso, ctx->DYNAMIC_F1);

   492 		if(ctx->v_check)

   493 			vcheck_res = ctx->v_check(OSSL_DYNAMIC_VERSION);

   494 		/* We fail if the version checker veto'd the load *or* if it is

   495 		 * deferring to us (by returning its version) and we think it is

   496 		 * too old. */

   497 		if(vcheck_res < OSSL_DYNAMIC_OLDEST)

   498 			{

   499 			/* Fail */

   500 			ctx->bind_engine = NULL;

   501 			ctx->v_check = NULL;

   502 			DSO_free(ctx->dynamic_dso);

   503 			ctx->dynamic_dso = NULL;

   504 			ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

   505 				ENGINE_R_VERSION_INCOMPATIBILITY);

   506 			return 0;

   507 			}

   508 		}

   509 	/* First binary copy the ENGINE structure so that we can roll back if

   510 	 * the hand-over fails */

   511 	memcpy(&cpy, e, sizeof(ENGINE));

   512 	/* Provide the ERR, "ex_data", memory, and locking callbacks so the

   513 	 * loaded library uses our state rather than its own. FIXME: As noted in

   514 	 * engine.h, much of this would be simplified if each area of code

   515 	 * provided its own "summary" structure of all related callbacks. It

   516 	 * would also increase opaqueness. */

   517 	fns.static_state = ENGINE_get_static_state();

   518 	fns.err_fns = ERR_get_implementation();

   519 	fns.ex_data_fns = CRYPTO_get_ex_data_implementation();

   520 	CRYPTO_get_mem_functions(&fns.mem_fns.malloc_cb,

   521 				&fns.mem_fns.realloc_cb,

   522 				&fns.mem_fns.free_cb);

   523 	fns.lock_fns.lock_locking_cb = CRYPTO_get_locking_callback();

   524 	fns.lock_fns.lock_add_lock_cb = CRYPTO_get_add_lock_callback();

   525 	fns.lock_fns.dynlock_create_cb = CRYPTO_get_dynlock_create_callback();

   526 	fns.lock_fns.dynlock_lock_cb = CRYPTO_get_dynlock_lock_callback();

   527 	fns.lock_fns.dynlock_destroy_cb = CRYPTO_get_dynlock_destroy_callback();

   528 	/* Now that we've loaded the dynamic engine, make sure no "dynamic"

   529 	 * ENGINE elements will show through. */

   530 	engine_set_all_null(e);

   531 

   532 	/* Try to bind the ENGINE onto our own ENGINE structure */

   533 	if(!ctx->bind_engine(e, ctx->engine_id, &fns))

   534 		{

   535 		ctx->bind_engine = NULL;

   536 		ctx->v_check = NULL;

   537 		DSO_free(ctx->dynamic_dso);

   538 		ctx->dynamic_dso = NULL;

   539 		ENGINEerr(ENGINE_F_DYNAMIC_LOAD,ENGINE_R_INIT_FAILED);

   540 		/* Copy the original ENGINE structure back */

   541 		memcpy(e, &cpy, sizeof(ENGINE));

   542 		return 0;

   543 		}

   544 	/* Do we try to add this ENGINE to the internal list too? */

   545 	if(ctx->list_add_value > 0)

   546 		{

   547 		if(!ENGINE_add(e))

   548 			{

   549 			/* Do we tolerate this or fail? */

   550 			if(ctx->list_add_value > 1)

   551 				{

   552 				/* Fail - NB: By this time, it's too late to

   553 				 * rollback, and trying to do so allows the

   554 				 * bind_engine() code to have created leaks. We

   555 				 * just have to fail where we are, after the

   556 				 * ENGINE has changed. */

   557 				ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

   558 					ENGINE_R_CONFLICTING_ENGINE_ID);

   559 				return 0;

   560 				}

   561 			/* Tolerate */

   562 			ERR_clear_error();

   563 			}

   564 		}

   565 	return 1;

   566 	}