/* crypto/engine/eng_dyn.c */

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

  * project 2001.

  */

 /* ====================================================================

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

  *

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

  * modification, are permitted provided that the following conditions

  * are met:

  *

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

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

  *

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

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

  *    the documentation and/or other materials provided with the

  *    distribution.

  *

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

  *    software must display the following acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

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

  *

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

  *    endorse or promote products derived from this software without

  *    prior written permission. For written permission, please contact

  *    licensing@OpenSSL.org.

  *

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

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

  *    permission of the OpenSSL Project.

  *

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

  *    acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

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

  *

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

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

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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

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

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

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

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

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

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

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

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  * ====================================================================

  *

  * This product includes cryptographic software written by Eric Young

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

  * Hudson (tjh@cryptsoft.com).

  *

  */

 /*

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

  */

 #include "eng_int.h"

 #include <openssl/dso.h>

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

 #include "libcrypto_wsd_macros.h"

 #include "libcrypto_wsd.h"

 #endif

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

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

 /* Our ENGINE handlers */

 static int dynamic_init(ENGINE *e);

 static int dynamic_finish(ENGINE *e);

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

 /* Predeclare our context type */

 typedef struct st_dynamic_data_ctx dynamic_data_ctx;

 /* The implementation for the important control command */

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

 #define DYNAMIC_CMD_SO_PATH		ENGINE_CMD_BASE

 #define DYNAMIC_CMD_NO_VCHECK		(ENGINE_CMD_BASE + 1)

 #define DYNAMIC_CMD_ID			(ENGINE_CMD_BASE + 2)

 #define DYNAMIC_CMD_LIST_ADD		(ENGINE_CMD_BASE + 3)

 #define DYNAMIC_CMD_DIR_LOAD		(ENGINE_CMD_BASE + 4)

 #define DYNAMIC_CMD_DIR_ADD		(ENGINE_CMD_BASE + 5)

 #define DYNAMIC_CMD_LOAD		(ENGINE_CMD_BASE + 6)

 /* The constants used when creating the ENGINE */

 #ifndef EMULATOR

 static const char *engine_dynamic_id = "dynamic";

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

 #else

 static const char *const engine_dynamic_id = "dynamic";

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

 #endif

 static const ENGINE_CMD_DEFN dynamic_cmd_defns[] = {

 	{DYNAMIC_CMD_SO_PATH,

 		"SO_PATH",

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

 		ENGINE_CMD_FLAG_STRING},

 	{DYNAMIC_CMD_NO_VCHECK,

 		"NO_VCHECK",

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

 		ENGINE_CMD_FLAG_NUMERIC},

 	{DYNAMIC_CMD_ID,

 		"ID",

 		"Specifies an ENGINE id name for loading",

 		ENGINE_CMD_FLAG_STRING},

 	{DYNAMIC_CMD_LIST_ADD,

 		"LIST_ADD",

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

 		ENGINE_CMD_FLAG_NUMERIC},

 	{DYNAMIC_CMD_DIR_LOAD,

 		"DIR_LOAD",

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

 		ENGINE_CMD_FLAG_NUMERIC},

 	{DYNAMIC_CMD_DIR_ADD,

 		"DIR_ADD",

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

 		ENGINE_CMD_FLAG_STRING},

 	{DYNAMIC_CMD_LOAD,

 		"LOAD",

 		"Load up the ENGINE specified by other settings",

 		ENGINE_CMD_FLAG_NO_INPUT},

 	{0, NULL, NULL, 0}

 	};

 static const ENGINE_CMD_DEFN dynamic_cmd_defns_empty[] = {

 	{0, NULL, NULL, 0}

 	};

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

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

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

 struct st_dynamic_data_ctx

 	{

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

 	DSO *dynamic_dso;

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

 	dynamic_v_check_fn v_check;

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

 	dynamic_bind_engine bind_engine;

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

 	const char *DYNAMIC_LIBNAME;

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

 	int no_vcheck;

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

 	const char *engine_id;

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

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

 	int list_add_value;

 	/* The symbol name for the version checking function */

 	const char *DYNAMIC_F1;

 	/* The symbol name for the "initialise ENGINE structure" function */

 	const char *DYNAMIC_F2;

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

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

 	int dir_load;

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

 	STACK *dirs;

 	};

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

  * structure. */

 #ifndef EMULATOR 

 static int dynamic_ex_data_idx = -1;

 #else

 GET_STATIC_VAR_FROM_TLS(dynamic_ex_data_idx,eng_dyn,int)

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

 #endif

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

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

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

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

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

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

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

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

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

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

 	{

 	if(ptr)

 		{

 		dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr;

 		if(ctx->dynamic_dso)

 			DSO_free(ctx->dynamic_dso);

 		if(ctx->DYNAMIC_LIBNAME)

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

 		if(ctx->engine_id)

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

 		if(ctx->dirs)

 			sk_pop_free(ctx->dirs, int_free_str);

 		OPENSSL_free(ctx);

 		}

 	}

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

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

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

  * lock which is far worse. */

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

 	{

 	dynamic_data_ctx *c;

 	c = OPENSSL_malloc(sizeof(dynamic_data_ctx));

 	if(!c)

 		{

 		ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX,ERR_R_MALLOC_FAILURE);

 		return 0;

 		}

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

 	c->dynamic_dso = NULL;

 	c->v_check = NULL;

 	c->bind_engine = NULL;

 	c->DYNAMIC_LIBNAME = NULL;

 	c->no_vcheck = 0;

 	c->engine_id = NULL;

 	c->list_add_value = 0;

 	c->DYNAMIC_F1 = "v_check";

 	c->DYNAMIC_F2 = "bind_engine";

 	c->dir_load = 1;

 	c->dirs = sk_new_null();

 	if(!c->dirs)

 		{

 		ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX,ERR_R_MALLOC_FAILURE);

 		OPENSSL_free(c);

 		return 0;

 		}

 	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);

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

 				dynamic_ex_data_idx)) == NULL)

 		{

 		/* Good, we're the first */

 		ENGINE_set_ex_data(e, dynamic_ex_data_idx, c);

 		*ctx = c;

 		c = NULL;

 		}

 	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

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

 	 * context of the thread that won. */

 	if(c)

 		OPENSSL_free(c);

 	return 1;

 	}

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

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

 static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e)

 	{

 	dynamic_data_ctx *ctx;

 	if(dynamic_ex_data_idx < 0)

 		{

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

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

 		 * freed when an ENGINE goes underground. */

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

 					dynamic_data_ctx_free_func);

 		if(new_idx == -1)

 			{

 			ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX,ENGINE_R_NO_INDEX);

 			return NULL;

 			}

 		CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);

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

 		if(dynamic_ex_data_idx < 0)

 			{

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

 			dynamic_ex_data_idx = new_idx;

 			new_idx = -1;

 			}

 		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

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

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

 		 * if it were. */

 		}

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

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

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

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

 		return NULL;

 	return ctx;

 	}

 static ENGINE *engine_dynamic(void)

 	{

 	ENGINE *ret = ENGINE_new();

 	if(!ret)

 		return NULL;

 	if(!ENGINE_set_id(ret, engine_dynamic_id) ||

 			!ENGINE_set_name(ret, engine_dynamic_name) ||

 			!ENGINE_set_init_function(ret, dynamic_init) ||

 			!ENGINE_set_finish_function(ret, dynamic_finish) ||

 			!ENGINE_set_ctrl_function(ret, dynamic_ctrl) ||

 			!ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) ||

 			!ENGINE_set_cmd_defns(ret, dynamic_cmd_defns))

 		{

 		ENGINE_free(ret);

 		return NULL;

 		}

 	return ret;

 	}

 EXPORT_C void ENGINE_load_dynamic(void)

 	{

 	ENGINE *toadd = engine_dynamic();

 	if(!toadd) return;

 	ENGINE_add(toadd);

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

 	 * we release our just-created reference. */

 	ENGINE_free(toadd);

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

 	 * already added (eg. someone calling ENGINE_load_blah then calling

 	 * ENGINE_load_builtin_engines() perhaps). */

 	ERR_clear_error();

 	}

 static int dynamic_init(ENGINE *e)

 	{

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

 	 * for anything. */

 	return 0;

 	}

 static int dynamic_finish(ENGINE *e)

 	{

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

 	 * failing. */

 	return 0;

 	}

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

 	{

 	dynamic_data_ctx *ctx = dynamic_get_data_ctx(e);

 	int initialised;

 	if(!ctx)

 		{

 		ENGINEerr(ENGINE_F_DYNAMIC_CTRL,ENGINE_R_NOT_LOADED);

 		return 0;

 		}

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

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

 	if(initialised)

 		{

 		ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

 			ENGINE_R_ALREADY_LOADED);

 		return 0;

 		}

 	switch(cmd)

 		{

 	case DYNAMIC_CMD_SO_PATH:

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

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

 			p = NULL;

 		if(ctx->DYNAMIC_LIBNAME)

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

 		if(p)

 			ctx->DYNAMIC_LIBNAME = BUF_strdup(p);

 		else

 			ctx->DYNAMIC_LIBNAME = NULL;

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

 	case DYNAMIC_CMD_NO_VCHECK:

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

 		return 1;

 	case DYNAMIC_CMD_ID:

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

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

 			p = NULL;

 		if(ctx->engine_id)

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

 		if(p)

 			ctx->engine_id = BUF_strdup(p);

 		else

 			ctx->engine_id = NULL;

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

 	case DYNAMIC_CMD_LIST_ADD:

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

 			{

 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

 				ENGINE_R_INVALID_ARGUMENT);

 			return 0;

 			}

 		ctx->list_add_value = (int)i;

 		return 1;

 	case DYNAMIC_CMD_LOAD:

 		return dynamic_load(e, ctx);

 	case DYNAMIC_CMD_DIR_LOAD:

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

 			{

 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

 				ENGINE_R_INVALID_ARGUMENT);

 			return 0;

 			}

 		ctx->dir_load = (int)i;

 		return 1;

 	case DYNAMIC_CMD_DIR_ADD:

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

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

 			{

 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

 				ENGINE_R_INVALID_ARGUMENT);

 			return 0;

 			}

 		{

 		char *tmp_str = BUF_strdup(p);

 		if(!tmp_str)

 			{

 			ENGINEerr(ENGINE_F_DYNAMIC_CTRL,

 				ERR_R_MALLOC_FAILURE);

 			return 0;

 			}

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

 		}

 		return 1;

 	default:

 		break;

 		}

 	ENGINEerr(ENGINE_F_DYNAMIC_CTRL,ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);

 	return 0;

 	}

 static int int_load(dynamic_data_ctx *ctx)

 	{

 	int num, loop;

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

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

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

 		return 1;

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

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

 		return 0;

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

 		{

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

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

 		if(!merge)

 			return 0;

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

 			{

 			/* Found what we're looking for */

 			OPENSSL_free(merge);

 			return 1;

 			}

 		OPENSSL_free(merge);

 		}

 	return 0;

 	}

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

 	{

 	ENGINE cpy;

 	dynamic_fns fns;

 	if(!ctx->dynamic_dso)

 		ctx->dynamic_dso = DSO_new();

 	if(!ctx->DYNAMIC_LIBNAME)

 		{

 		if(!ctx->engine_id)

 			return 0;

 		ctx->DYNAMIC_LIBNAME =

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

 		}

 	if(!int_load(ctx))

 		{

 		ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

 			ENGINE_R_DSO_NOT_FOUND);

 		DSO_free(ctx->dynamic_dso);

 		ctx->dynamic_dso = NULL;

 		return 0;

 		}

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

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

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

 		{

 		ctx->bind_engine = NULL;

 		DSO_free(ctx->dynamic_dso);

 		ctx->dynamic_dso = NULL;

 		ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

 			ENGINE_R_DSO_FAILURE);

 		return 0;

 		}

 	/* Do we perform version checking? */

 	if(!ctx->no_vcheck)

 		{

 		unsigned long vcheck_res = 0;

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

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

 		ctx->v_check = (dynamic_v_check_fn)DSO_bind_func(

 				ctx->dynamic_dso, ctx->DYNAMIC_F1);

 		if(ctx->v_check)

 			vcheck_res = ctx->v_check(OSSL_DYNAMIC_VERSION);

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

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

 		 * too old. */

 		if(vcheck_res < OSSL_DYNAMIC_OLDEST)

 			{

 			/* Fail */

 			ctx->bind_engine = NULL;

 			ctx->v_check = NULL;

 			DSO_free(ctx->dynamic_dso);

 			ctx->dynamic_dso = NULL;

 			ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

 				ENGINE_R_VERSION_INCOMPATIBILITY);

 			return 0;

 			}

 		}

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

 	 * the hand-over fails */

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

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

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

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

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

 	 * would also increase opaqueness. */

 	fns.static_state = ENGINE_get_static_state();

 	fns.err_fns = ERR_get_implementation();

 	fns.ex_data_fns = CRYPTO_get_ex_data_implementation();

 	CRYPTO_get_mem_functions(&fns.mem_fns.malloc_cb,

 				&fns.mem_fns.realloc_cb,

 				&fns.mem_fns.free_cb);

 	fns.lock_fns.lock_locking_cb = CRYPTO_get_locking_callback();

 	fns.lock_fns.lock_add_lock_cb = CRYPTO_get_add_lock_callback();

 	fns.lock_fns.dynlock_create_cb = CRYPTO_get_dynlock_create_callback();

 	fns.lock_fns.dynlock_lock_cb = CRYPTO_get_dynlock_lock_callback();

 	fns.lock_fns.dynlock_destroy_cb = CRYPTO_get_dynlock_destroy_callback();

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

 	 * ENGINE elements will show through. */

 	engine_set_all_null(e);

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

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

 		{

 		ctx->bind_engine = NULL;

 		ctx->v_check = NULL;

 		DSO_free(ctx->dynamic_dso);

 		ctx->dynamic_dso = NULL;

 		ENGINEerr(ENGINE_F_DYNAMIC_LOAD,ENGINE_R_INIT_FAILED);

 		/* Copy the original ENGINE structure back */

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

 		return 0;

 		}

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

 	if(ctx->list_add_value > 0)

 		{

 		if(!ENGINE_add(e))

 			{

 			/* Do we tolerate this or fail? */

 			if(ctx->list_add_value > 1)

 				{

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

 				 * rollback, and trying to do so allows the

 				 * bind_engine() code to have created leaks. We

 				 * just have to fail where we are, after the

 				 * ENGINE has changed. */

 				ENGINEerr(ENGINE_F_DYNAMIC_LOAD,

 					ENGINE_R_CONFLICTING_ENGINE_ID);

 				return 0;

 				}

 			/* Tolerate */

 			ERR_clear_error();

 			}

 		}

 	return 1;

 	}