Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/crypto/../../libssl/src/crypto/engine/eng_list.c	Lines:	81	159	50.9 %
Date:	2016-12-06	Branches:	37	72	51.4 %


/* $OpenBSD: eng_list.c,v 1.21 2015/07/19 00:56:48 bcook Exp $ */
/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * 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).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECDH support in OpenSSL originally developed by
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */

#include <string.h>
#include <unistd.h>

#include <openssl/opensslconf.h>

#include <openssl/err.h>

#include "cryptlib.h"
#include "eng_int.h"

/* The linked-list of pointers to engine types. engine_list_head
 * incorporates an implicit structural reference but engine_list_tail
 * does not - the latter is a computational niceity and only points
 * to something that is already pointed to by its predecessor in the
 * list (or engine_list_head itself). In the same way, the use of the
 * "prev" pointer in each ENGINE is to save excessive list iteration,
 * it doesn't correspond to an extra structural reference. Hence,
 * engine_list_head, and each non-null "next" pointer account for
 * the list itself assuming exactly 1 structural reference on each
 * list member. */
static ENGINE *engine_list_head = NULL;
static ENGINE *engine_list_tail = NULL;

/* This cleanup function is only needed internally. If it should be called, we
 * register it with the "ENGINE_cleanup()" stack to be called during cleanup. */

static void
engine_list_cleanup(void)
{
	ENGINE *iterator = engine_list_head;

	while (iterator != NULL && ENGINE_remove(iterator))
		iterator = engine_list_head;
}

/* These static functions starting with a lower case "engine_" always
 * take place when CRYPTO_LOCK_ENGINE has been locked up. */
static int
engine_list_add(ENGINE *e)
{
	int conflict = 0;
	ENGINE *iterator = NULL;

	if (e == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
		    ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
	iterator = engine_list_head;
	while (iterator && !conflict) {
		conflict = (strcmp(iterator->id, e->id) == 0);
		iterator = iterator->next;
	}
	if (conflict) {
		ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
		    ENGINE_R_CONFLICTING_ENGINE_ID);
		return 0;
	}
	if (engine_list_head == NULL) {
		/* We are adding to an empty list. */
		if (engine_list_tail) {
			ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
			    ENGINE_R_INTERNAL_LIST_ERROR);
			return 0;
		}
		engine_list_head = e;
		e->prev = NULL;
		/* The first time the list allocates, we should register the
		 * cleanup. */
		engine_cleanup_add_last(engine_list_cleanup);
	} else {
		/* We are adding to the tail of an existing list. */
		if ((engine_list_tail == NULL) ||
		    (engine_list_tail->next != NULL)) {
			ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
			    ENGINE_R_INTERNAL_LIST_ERROR);
			return 0;
		}
		engine_list_tail->next = e;
		e->prev = engine_list_tail;
	}
	/* Having the engine in the list assumes a structural
	 * reference. */
	e->struct_ref++;
	engine_ref_debug(e, 0, 1)
	/* However it came to be, e is the last item in the list. */
	engine_list_tail = e;
	e->next = NULL;
	return 1;
}

static int
engine_list_remove(ENGINE *e)
{
	ENGINE *iterator;

	if (e == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
		    ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
	/* We need to check that e is in our linked list! */
	iterator = engine_list_head;
	while (iterator && (iterator != e))
		iterator = iterator->next;
	if (iterator == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
		    ENGINE_R_ENGINE_IS_NOT_IN_LIST);
		return 0;
	}
	/* un-link e from the chain. */
	if (e->next)
		e->next->prev = e->prev;
	if (e->prev)
		e->prev->next = e->next;
	/* Correct our head/tail if necessary. */
	if (engine_list_head == e)
		engine_list_head = e->next;
	if (engine_list_tail == e)
		engine_list_tail = e->prev;
	engine_free_util(e, 0);
	return 1;
}

/* Get the first/last "ENGINE" type available. */
ENGINE *
ENGINE_get_first(void)
{
	ENGINE *ret;

	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	ret = engine_list_head;
	if (ret) {
		ret->struct_ref++;
		engine_ref_debug(ret, 0, 1)
	}
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
	return ret;
}

ENGINE *
ENGINE_get_last(void)
{
	ENGINE *ret;

	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	ret = engine_list_tail;
	if (ret) {
		ret->struct_ref++;
		engine_ref_debug(ret, 0, 1)
	}
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
	return ret;
}

/* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
ENGINE *
ENGINE_get_next(ENGINE *e)
{
	ENGINE *ret = NULL;

	if (e == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_GET_NEXT,
		    ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	ret = e->next;
	if (ret) {
		/* Return a valid structural refernce to the next ENGINE */
		ret->struct_ref++;
		engine_ref_debug(ret, 0, 1)
	}
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
	/* Release the structural reference to the previous ENGINE */
	ENGINE_free(e);
	return ret;
}

ENGINE *
ENGINE_get_prev(ENGINE *e)
{
	ENGINE *ret = NULL;

	if (e == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_GET_PREV,
		    ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	ret = e->prev;
	if (ret) {
		/* Return a valid structural reference to the next ENGINE */
		ret->struct_ref++;
		engine_ref_debug(ret, 0, 1)
	}
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
	/* Release the structural reference to the previous ENGINE */
	ENGINE_free(e);
	return ret;
}

/* Add another "ENGINE" type into the list. */
int
ENGINE_add(ENGINE *e)
{
	int to_return = 1;

	if (e == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_ADD,
		    ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
	if ((e->id == NULL) || (e->name == NULL)) {
		ENGINEerr(ENGINE_F_ENGINE_ADD,
		    ENGINE_R_ID_OR_NAME_MISSING);
	}
	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	if (!engine_list_add(e)) {
		ENGINEerr(ENGINE_F_ENGINE_ADD,
		    ENGINE_R_INTERNAL_LIST_ERROR);
		to_return = 0;
	}
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
	return to_return;
}

/* Remove an existing "ENGINE" type from the array. */
int
ENGINE_remove(ENGINE *e)
{
	int to_return = 1;

	if (e == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_REMOVE,
		    ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	if (!engine_list_remove(e)) {
		ENGINEerr(ENGINE_F_ENGINE_REMOVE,
		    ENGINE_R_INTERNAL_LIST_ERROR);
		to_return = 0;
	}
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
	return to_return;
}

static void
engine_cpy(ENGINE *dest, const ENGINE *src)
{
	dest->id = src->id;
	dest->name = src->name;
#ifndef OPENSSL_NO_RSA
	dest->rsa_meth = src->rsa_meth;
#endif
#ifndef OPENSSL_NO_DSA
	dest->dsa_meth = src->dsa_meth;
#endif
#ifndef OPENSSL_NO_DH
	dest->dh_meth = src->dh_meth;
#endif
#ifndef OPENSSL_NO_ECDH
	dest->ecdh_meth = src->ecdh_meth;
#endif
#ifndef OPENSSL_NO_ECDSA
	dest->ecdsa_meth = src->ecdsa_meth;
#endif
	dest->rand_meth = src->rand_meth;
	dest->store_meth = src->store_meth;
	dest->ciphers = src->ciphers;
	dest->digests = src->digests;
	dest->pkey_meths = src->pkey_meths;
	dest->destroy = src->destroy;
	dest->init = src->init;
	dest->finish = src->finish;
	dest->ctrl = src->ctrl;
	dest->load_privkey = src->load_privkey;
	dest->load_pubkey = src->load_pubkey;
	dest->cmd_defns = src->cmd_defns;
	dest->flags = src->flags;
}

ENGINE *
ENGINE_by_id(const char *id)
{
	ENGINE *iterator;

	if (id == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_BY_ID,
		    ERR_R_PASSED_NULL_PARAMETER);
		return NULL;
	}
	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
	iterator = engine_list_head;
	while (iterator && (strcmp(id, iterator->id) != 0))
		iterator = iterator->next;
	if (iterator) {
		/* We need to return a structural reference. If this is an
		 * ENGINE type that returns copies, make a duplicate - otherwise
		 * increment the existing ENGINE's reference count. */
		if (iterator->flags & ENGINE_FLAGS_BY_ID_COPY) {
			ENGINE *cp = ENGINE_new();
			if (!cp)
				iterator = NULL;
			else {
				engine_cpy(cp, iterator);
				iterator = cp;
			}
		} else {
			iterator->struct_ref++;
			engine_ref_debug(iterator, 0, 1)
		}
	}
	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

	if (iterator == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_BY_ID, ENGINE_R_NO_SUCH_ENGINE);
		ERR_asprintf_error_data("id=%s", id);
	}
	return iterator;
}

int
ENGINE_up_ref(ENGINE *e)
{
	if (e == NULL) {
		ENGINEerr(ENGINE_F_ENGINE_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}
	CRYPTO_add(&e->struct_ref, 1, CRYPTO_LOCK_ENGINE);
	return 1;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: eng_list.c,v 1.21 2015/07/19 00:56:48 bcook Exp $ */
2			/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
3			* project 2000.
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			* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60			* ECDH support in OpenSSL originally developed by
61			* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
62			*/
63
64			#include <string.h>
65			#include <unistd.h>
66
67			#include <openssl/opensslconf.h>
68
69			#include <openssl/err.h>
70
71			#include "cryptlib.h"
72			#include "eng_int.h"
73
74			/* The linked-list of pointers to engine types. engine_list_head
75			* incorporates an implicit structural reference but engine_list_tail
76			* does not - the latter is a computational niceity and only points
77			* to something that is already pointed to by its predecessor in the
78			* list (or engine_list_head itself). In the same way, the use of the
79			* "prev" pointer in each ENGINE is to save excessive list iteration,
80			* it doesn't correspond to an extra structural reference. Hence,
81			* engine_list_head, and each non-null "next" pointer account for
82			* the list itself assuming exactly 1 structural reference on each
83			* list member. */
84			static ENGINE *engine_list_head = NULL;
85			static ENGINE *engine_list_tail = NULL;
86
87			/* This cleanup function is only needed internally. If it should be called, we
88			* register it with the "ENGINE_cleanup()" stack to be called during cleanup. */
89
90			static void
91			engine_list_cleanup(void)
92		4	{
93		4	ENGINE *iterator = engine_list_head;
94
95	✗✓✗✗	8	while (iterator != NULL && ENGINE_remove(iterator))
96			iterator = engine_list_head;
97		4	}
98
99			/* These static functions starting with a lower case "engine_" always
100			* take place when CRYPTO_LOCK_ENGINE has been locked up. */
101			static int
102			engine_list_add(ENGINE *e)
103		518	{
104		518	int conflict = 0;
105		518	ENGINE *iterator = NULL;
106
107	✗✓	518	if (e == NULL) {
108			ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
109			ERR_R_PASSED_NULL_PARAMETER);
110			return 0;
111			}
112		518	iterator = engine_list_head;
113	✓✓	131855	while (iterator && !conflict) {
114		130819	conflict = (strcmp(iterator->id, e->id) == 0);
115		130819	iterator = iterator->next;
116			}
117	✓✓	518	if (conflict) {
118		1	ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
119			ENGINE_R_CONFLICTING_ENGINE_ID);
120		1	return 0;
121			}
122	✓✓	517	if (engine_list_head == NULL) {
123			/* We are adding to an empty list. */
124	✗✓	4	if (engine_list_tail) {
125			ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
126			ENGINE_R_INTERNAL_LIST_ERROR);
127			return 0;
128			}
129		4	engine_list_head = e;
130		4	e->prev = NULL;
131			/* The first time the list allocates, we should register the
132			* cleanup. */
133		4	engine_cleanup_add_last(engine_list_cleanup);
134			} else {
135			/* We are adding to the tail of an existing list. */
136	✓✗✗✓	513	if ((engine_list_tail == NULL) \|\|
137			(engine_list_tail->next != NULL)) {
138			ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
139			ENGINE_R_INTERNAL_LIST_ERROR);
140			return 0;
141			}
142		513	engine_list_tail->next = e;
143		513	e->prev = engine_list_tail;
144			}
145			/* Having the engine in the list assumes a structural
146			* reference. */
147		517	e->struct_ref++;
148			engine_ref_debug(e, 0, 1)
149			/* However it came to be, e is the last item in the list. */
150		517	engine_list_tail = e;
151		517	e->next = NULL;
152		517	return 1;
153			}
154
155			static int
156			engine_list_remove(ENGINE *e)
157		518	{
158			ENGINE *iterator;
159
160	✗✓	518	if (e == NULL) {
161			ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
162			ERR_R_PASSED_NULL_PARAMETER);
163			return 0;
164			}
165			/* We need to check that e is in our linked list! */
166		518	iterator = engine_list_head;
167	✓✓	1039	while (iterator && (iterator != e))
168		3	iterator = iterator->next;
169	✓✓	518	if (iterator == NULL) {
170		1	ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
171			ENGINE_R_ENGINE_IS_NOT_IN_LIST);
172		1	return 0;
173			}
174			/* un-link e from the chain. */
175	✓✓	517	if (e->next)
176		512	e->next->prev = e->prev;
177	✓✓	517	if (e->prev)
178		1	e->prev->next = e->next;
179			/* Correct our head/tail if necessary. */
180	✓✓	517	if (engine_list_head == e)
181		516	engine_list_head = e->next;
182	✓✓	517	if (engine_list_tail == e)
183		5	engine_list_tail = e->prev;
184		517	engine_free_util(e, 0);
185		517	return 1;
186			}
187
188			/* Get the first/last "ENGINE" type available. */
189			ENGINE *
190			ENGINE_get_first(void)
191		530	{
192			ENGINE *ret;
193
194		530	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
195		530	ret = engine_list_head;
196	✓✓	530	if (ret) {
197		518	ret->struct_ref++;
198			engine_ref_debug(ret, 0, 1)
199			}
200		530	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
201		530	return ret;
202			}
203
204			ENGINE *
205			ENGINE_get_last(void)
206			{
207			ENGINE *ret;
208
209			CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
210			ret = engine_list_tail;
211			if (ret) {
212			ret->struct_ref++;
213			engine_ref_debug(ret, 0, 1)
214			}
215			CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
216			return ret;
217			}
218
219			/* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
220			ENGINE *
221			ENGINE_get_next(ENGINE *e)
222		7	{
223		7	ENGINE *ret = NULL;
224
225	✗✓	7	if (e == NULL) {
226			ENGINEerr(ENGINE_F_ENGINE_GET_NEXT,
227			ERR_R_PASSED_NULL_PARAMETER);
228			return 0;
229			}
230		7	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
231		7	ret = e->next;
232	✓✓	7	if (ret) {
233			/* Return a valid structural refernce to the next ENGINE */
234		2	ret->struct_ref++;
235			engine_ref_debug(ret, 0, 1)
236			}
237		7	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
238			/* Release the structural reference to the previous ENGINE */
239		7	ENGINE_free(e);
240		7	return ret;
241			}
242
243			ENGINE *
244			ENGINE_get_prev(ENGINE *e)
245			{
246			ENGINE *ret = NULL;
247
248			if (e == NULL) {
249			ENGINEerr(ENGINE_F_ENGINE_GET_PREV,
250			ERR_R_PASSED_NULL_PARAMETER);
251			return 0;
252			}
253			CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
254			ret = e->prev;
255			if (ret) {
256			/* Return a valid structural reference to the next ENGINE */
257			ret->struct_ref++;
258			engine_ref_debug(ret, 0, 1)
259			}
260			CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
261			/* Release the structural reference to the previous ENGINE */
262			ENGINE_free(e);
263			return ret;
264			}
265
266			/* Add another "ENGINE" type into the list. */
267			int
268			ENGINE_add(ENGINE *e)
269		518	{
270		518	int to_return = 1;
271
272	✗✓	518	if (e == NULL) {
273			ENGINEerr(ENGINE_F_ENGINE_ADD,
274			ERR_R_PASSED_NULL_PARAMETER);
275			return 0;
276			}
277	✓✗✗✓	518	if ((e->id == NULL) \|\| (e->name == NULL)) {
278			ENGINEerr(ENGINE_F_ENGINE_ADD,
279			ENGINE_R_ID_OR_NAME_MISSING);
280			}
281		518	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
282	✓✓	518	if (!engine_list_add(e)) {
283		1	ENGINEerr(ENGINE_F_ENGINE_ADD,
284			ENGINE_R_INTERNAL_LIST_ERROR);
285		1	to_return = 0;
286			}
287		518	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
288		518	return to_return;
289			}
290
291			/* Remove an existing "ENGINE" type from the array. */
292			int
293			ENGINE_remove(ENGINE *e)
294		518	{
295		518	int to_return = 1;
296
297	✗✓	518	if (e == NULL) {
298			ENGINEerr(ENGINE_F_ENGINE_REMOVE,
299			ERR_R_PASSED_NULL_PARAMETER);
300			return 0;
301			}
302		518	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
303	✓✓	518	if (!engine_list_remove(e)) {
304		1	ENGINEerr(ENGINE_F_ENGINE_REMOVE,
305			ENGINE_R_INTERNAL_LIST_ERROR);
306		1	to_return = 0;
307			}
308		518	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
309		518	return to_return;
310			}
311
312			static void
313			engine_cpy(ENGINE dest, const ENGINE src)
314			{
315			dest->id = src->id;
316			dest->name = src->name;
317			#ifndef OPENSSL_NO_RSA
318			dest->rsa_meth = src->rsa_meth;
319			#endif
320			#ifndef OPENSSL_NO_DSA
321			dest->dsa_meth = src->dsa_meth;
322			#endif
323			#ifndef OPENSSL_NO_DH
324			dest->dh_meth = src->dh_meth;
325			#endif
326			#ifndef OPENSSL_NO_ECDH
327			dest->ecdh_meth = src->ecdh_meth;
328			#endif
329			#ifndef OPENSSL_NO_ECDSA
330			dest->ecdsa_meth = src->ecdsa_meth;
331			#endif
332			dest->rand_meth = src->rand_meth;
333			dest->store_meth = src->store_meth;
334			dest->ciphers = src->ciphers;
335			dest->digests = src->digests;
336			dest->pkey_meths = src->pkey_meths;
337			dest->destroy = src->destroy;
338			dest->init = src->init;
339			dest->finish = src->finish;
340			dest->ctrl = src->ctrl;
341			dest->load_privkey = src->load_privkey;
342			dest->load_pubkey = src->load_pubkey;
343			dest->cmd_defns = src->cmd_defns;
344			dest->flags = src->flags;
345			}
346
347			ENGINE *
348			ENGINE_by_id(const char *id)
349			{
350			ENGINE *iterator;
351
352			if (id == NULL) {
353			ENGINEerr(ENGINE_F_ENGINE_BY_ID,
354			ERR_R_PASSED_NULL_PARAMETER);
355			return NULL;
356			}
357			CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
358			iterator = engine_list_head;
359			while (iterator && (strcmp(id, iterator->id) != 0))
360			iterator = iterator->next;
361			if (iterator) {
362			/* We need to return a structural reference. If this is an
363			* ENGINE type that returns copies, make a duplicate - otherwise
364			* increment the existing ENGINE's reference count. */
365			if (iterator->flags & ENGINE_FLAGS_BY_ID_COPY) {
366			ENGINE *cp = ENGINE_new();
367			if (!cp)
368			iterator = NULL;
369			else {
370			engine_cpy(cp, iterator);
371			iterator = cp;
372			}
373			} else {
374			iterator->struct_ref++;
375			engine_ref_debug(iterator, 0, 1)
376			}
377			}
378			CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
379
380			if (iterator == NULL) {
381			ENGINEerr(ENGINE_F_ENGINE_BY_ID, ENGINE_R_NO_SUCH_ENGINE);
382			ERR_asprintf_error_data("id=%s", id);
383			}
384			return iterator;
385			}
386
387			int
388			ENGINE_up_ref(ENGINE *e)
389			{
390			if (e == NULL) {
391			ENGINEerr(ENGINE_F_ENGINE_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
392			return 0;
393			}
394			CRYPTO_add(&e->struct_ref, 1, CRYPTO_LOCK_ENGINE);
395			return 1;
396			}