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2b671586 1/* crypto/engine/eng_dyn.c */
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2/*
3 * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
4 * 2001.
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5 */
6/* ====================================================================
2b671586 7 * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
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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
0f113f3e 14 * notice, this list of conditions and the following disclaimer.
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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
14cfde9c 60#include "eng_int.h"
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61#include <openssl/dso.h>
62
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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 */
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68
69/* Our ENGINE handlers */
70static int dynamic_init(ENGINE *e);
71static int dynamic_finish(ENGINE *e);
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72static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p,
73 void (*f) (void));
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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
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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)
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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[] = {
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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};
9391f977 121
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122/*
123 * Loading code stores state inside the ENGINE structure via the "ex_data"
9391f977 124 * element. We load all our state into a single structure and use that as a
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125 * single context in the "ex_data" stack.
126 */
127struct st_dynamic_data_ctx {
128 /* The DSO object we load that supplies the ENGINE code */
129 DSO *dynamic_dso;
130 /*
131 * The function pointer to the version checking shared library function
132 */
133 dynamic_v_check_fn v_check;
134 /*
135 * The function pointer to the engine-binding shared library function
136 */
137 dynamic_bind_engine bind_engine;
138 /* The default name/path for loading the shared library */
b548a1f1 139 char *DYNAMIC_LIBNAME;
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140 /* Whether to continue loading on a version check failure */
141 int no_vcheck;
142 /* If non-NULL, stipulates the 'id' of the ENGINE to be loaded */
b548a1f1 143 char *engine_id;
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144 /*
145 * If non-zero, a successfully loaded ENGINE should be added to the
146 * internal ENGINE list. If 2, the add must succeed or the entire load
147 * should fail.
148 */
149 int list_add_value;
150 /* The symbol name for the version checking function */
151 const char *DYNAMIC_F1;
152 /* The symbol name for the "initialise ENGINE structure" function */
153 const char *DYNAMIC_F2;
154 /*
155 * Whether to never use 'dirs', use 'dirs' as a fallback, or only use
156 * 'dirs' for loading. Default is to use 'dirs' as a fallback.
157 */
158 int dir_load;
159 /* A stack of directories from which ENGINEs could be loaded */
160 STACK_OF(OPENSSL_STRING) *dirs;
161};
9391f977 162
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163/*
164 * This is the "ex_data" index we obtain and reserve for use with our context
165 * structure.
166 */
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167static int dynamic_ex_data_idx = -1;
168
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169static void int_free_str(char *s)
170{
171 OPENSSL_free(s);
172}
173
174/*
175 * Because our ex_data element may or may not get allocated depending on
176 * whether a "first-use" occurs before the ENGINE is freed, we have a memory
177 * leak problem to solve. We can't declare a "new" handler for the ex_data as
178 * we don't want a dynamic_data_ctx in *all* ENGINE structures of all types
179 * (this is a bug in the design of CRYPTO_EX_DATA). As such, we just declare
180 * a "free" handler and that will get called if an ENGINE is being destroyed
181 * and there was an ex_data element corresponding to our context type.
182 */
9391f977 183static void dynamic_data_ctx_free_func(void *parent, void *ptr,
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184 CRYPTO_EX_DATA *ad, int idx, long argl,
185 void *argp)
186{
187 if (ptr) {
188 dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr;
efa7dd64 189 DSO_free(ctx->dynamic_dso);
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190 OPENSSL_free(ctx->DYNAMIC_LIBNAME);
191 OPENSSL_free(ctx->engine_id);
25aaa98a 192 sk_OPENSSL_STRING_pop_free(ctx->dirs, int_free_str);
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193 OPENSSL_free(ctx);
194 }
195}
9391f977 196
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197/*
198 * Construct the per-ENGINE context. We create it blindly and then use a lock
199 * to check for a race - if so, all but one of the threads "racing" will have
9391f977 200 * wasted their time. The alternative involves creating everything inside the
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201 * lock which is far worse.
202 */
9391f977 203static int dynamic_set_data_ctx(ENGINE *e, dynamic_data_ctx **ctx)
0f113f3e 204{
b51bce94 205 dynamic_data_ctx *c = OPENSSL_zalloc(sizeof(*c));
b4faea50 206
90945fa3 207 if (c == NULL) {
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208 ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE);
209 return 0;
210 }
0f113f3e 211 c->dirs = sk_OPENSSL_STRING_new_null();
90945fa3 212 if (c->dirs == NULL) {
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213 ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE);
214 OPENSSL_free(c);
215 return 0;
216 }
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217 c->DYNAMIC_F1 = "v_check";
218 c->DYNAMIC_F2 = "bind_engine";
219 c->dir_load = 1;
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220 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
221 if ((*ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e,
222 dynamic_ex_data_idx))
223 == NULL) {
224 /* Good, we're the first */
225 ENGINE_set_ex_data(e, dynamic_ex_data_idx, c);
226 *ctx = c;
227 c = NULL;
228 }
229 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
230 /*
231 * If we lost the race to set the context, c is non-NULL and *ctx is the
232 * context of the thread that won.
233 */
b548a1f1 234 OPENSSL_free(c);
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235 return 1;
236}
9391f977 237
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238/*
239 * This function retrieves the context structure from an ENGINE's "ex_data",
240 * or if it doesn't exist yet, sets it up.
241 */
9391f977 242static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e)
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243{
244 dynamic_data_ctx *ctx;
245 if (dynamic_ex_data_idx < 0) {
246 /*
247 * Create and register the ENGINE ex_data, and associate our "free"
248 * function with it to ensure any allocated contexts get freed when
249 * an ENGINE goes underground.
250 */
251 int new_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL,
252 dynamic_data_ctx_free_func);
253 if (new_idx == -1) {
254 ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX, ENGINE_R_NO_INDEX);
255 return NULL;
256 }
257 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
258 /* Avoid a race by checking again inside this lock */
259 if (dynamic_ex_data_idx < 0) {
260 /* Good, someone didn't beat us to it */
261 dynamic_ex_data_idx = new_idx;
262 new_idx = -1;
263 }
264 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
265 /*
266 * In theory we could "give back" the index here if (new_idx>-1), but
267 * it's not possible and wouldn't gain us much if it were.
268 */
269 }
270 ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, dynamic_ex_data_idx);
271 /* Check if the context needs to be created */
272 if ((ctx == NULL) && !dynamic_set_data_ctx(e, &ctx))
273 /* "set_data" will set errors if necessary */
274 return NULL;
275 return ctx;
276}
9391f977 277
b6d1e52d 278static ENGINE *engine_dynamic(void)
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279{
280 ENGINE *ret = ENGINE_new();
90945fa3 281 if (ret == NULL)
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282 return NULL;
283 if (!ENGINE_set_id(ret, engine_dynamic_id) ||
284 !ENGINE_set_name(ret, engine_dynamic_name) ||
285 !ENGINE_set_init_function(ret, dynamic_init) ||
286 !ENGINE_set_finish_function(ret, dynamic_finish) ||
287 !ENGINE_set_ctrl_function(ret, dynamic_ctrl) ||
288 !ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) ||
289 !ENGINE_set_cmd_defns(ret, dynamic_cmd_defns)) {
290 ENGINE_free(ret);
291 return NULL;
292 }
293 return ret;
294}
9391f977 295
b6d1e52d 296void ENGINE_load_dynamic(void)
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297{
298 ENGINE *toadd = engine_dynamic();
299 if (!toadd)
300 return;
301 ENGINE_add(toadd);
302 /*
303 * If the "add" worked, it gets a structural reference. So either way, we
304 * release our just-created reference.
305 */
306 ENGINE_free(toadd);
307 /*
308 * If the "add" didn't work, it was probably a conflict because it was
309 * already added (eg. someone calling ENGINE_load_blah then calling
310 * ENGINE_load_builtin_engines() perhaps).
311 */
312 ERR_clear_error();
313}
b6d1e52d 314
9391f977 315static int dynamic_init(ENGINE *e)
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316{
317 /*
318 * We always return failure - the "dyanamic" engine itself can't be used
319 * for anything.
320 */
321 return 0;
322}
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323
324static int dynamic_finish(ENGINE *e)
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325{
326 /*
327 * This should never be called on account of "dynamic_init" always
328 * failing.
329 */
330 return 0;
331}
332
333static 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;
9391f977 337
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338 if (!ctx) {
339 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_NOT_LOADED);
340 return 0;
341 }
342 initialised = ((ctx->dynamic_dso == NULL) ? 0 : 1);
343 /* All our control commands require the ENGINE to be uninitialised */
344 if (initialised) {
345 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_ALREADY_LOADED);
346 return 0;
347 }
348 switch (cmd) {
349 case DYNAMIC_CMD_SO_PATH:
350 /* a NULL 'p' or a string of zero-length is the same thing */
351 if (p && (strlen((const char *)p) < 1))
352 p = NULL;
b548a1f1 353 OPENSSL_free(ctx->DYNAMIC_LIBNAME);
0f113f3e 354 if (p)
7644a9ae 355 ctx->DYNAMIC_LIBNAME = OPENSSL_strdup(p);
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356 else
357 ctx->DYNAMIC_LIBNAME = NULL;
358 return (ctx->DYNAMIC_LIBNAME ? 1 : 0);
359 case DYNAMIC_CMD_NO_VCHECK:
360 ctx->no_vcheck = ((i == 0) ? 0 : 1);
361 return 1;
362 case DYNAMIC_CMD_ID:
363 /* a NULL 'p' or a string of zero-length is the same thing */
364 if (p && (strlen((const char *)p) < 1))
365 p = NULL;
b548a1f1 366 OPENSSL_free(ctx->engine_id);
0f113f3e 367 if (p)
7644a9ae 368 ctx->engine_id = OPENSSL_strdup(p);
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369 else
370 ctx->engine_id = NULL;
371 return (ctx->engine_id ? 1 : 0);
372 case DYNAMIC_CMD_LIST_ADD:
373 if ((i < 0) || (i > 2)) {
374 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT);
375 return 0;
376 }
377 ctx->list_add_value = (int)i;
378 return 1;
379 case DYNAMIC_CMD_LOAD:
380 return dynamic_load(e, ctx);
381 case DYNAMIC_CMD_DIR_LOAD:
382 if ((i < 0) || (i > 2)) {
383 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT);
384 return 0;
385 }
386 ctx->dir_load = (int)i;
387 return 1;
388 case DYNAMIC_CMD_DIR_ADD:
389 /* a NULL 'p' or a string of zero-length is the same thing */
390 if (!p || (strlen((const char *)p) < 1)) {
391 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT);
392 return 0;
393 }
394 {
7644a9ae 395 char *tmp_str = OPENSSL_strdup(p);
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396 if (!tmp_str) {
397 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ERR_R_MALLOC_FAILURE);
398 return 0;
399 }
400 sk_OPENSSL_STRING_insert(ctx->dirs, tmp_str, -1);
401 }
402 return 1;
403 default:
404 break;
405 }
406 ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);
407 return 0;
408}
9391f977 409
02acf140 410static int int_load(dynamic_data_ctx *ctx)
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411{
412 int num, loop;
413 /* Unless told not to, try a direct load */
414 if ((ctx->dir_load != 2) && (DSO_load(ctx->dynamic_dso,
415 ctx->DYNAMIC_LIBNAME, NULL,
416 0)) != NULL)
417 return 1;
418 /* If we're not allowed to use 'dirs' or we have none, fail */
419 if (!ctx->dir_load || (num = sk_OPENSSL_STRING_num(ctx->dirs)) < 1)
420 return 0;
421 for (loop = 0; loop < num; loop++) {
422 const char *s = sk_OPENSSL_STRING_value(ctx->dirs, loop);
423 char *merge = DSO_merge(ctx->dynamic_dso, ctx->DYNAMIC_LIBNAME, s);
424 if (!merge)
425 return 0;
426 if (DSO_load(ctx->dynamic_dso, merge, NULL, 0)) {
427 /* Found what we're looking for */
428 OPENSSL_free(merge);
429 return 1;
430 }
431 OPENSSL_free(merge);
432 }
433 return 0;
434}
02acf140 435
9391f977 436static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx)
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437{
438 ENGINE cpy;
439 dynamic_fns fns;
9391f977 440
90945fa3 441 if (ctx->dynamic_dso == NULL)
0f113f3e 442 ctx->dynamic_dso = DSO_new();
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MC
443 if (ctx->dynamic_dso == NULL)
444 return 0;
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445 if (!ctx->DYNAMIC_LIBNAME) {
446 if (!ctx->engine_id)
447 return 0;
448 ctx->DYNAMIC_LIBNAME =
449 DSO_convert_filename(ctx->dynamic_dso, ctx->engine_id);
450 }
451 if (!int_load(ctx)) {
452 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_NOT_FOUND);
453 DSO_free(ctx->dynamic_dso);
454 ctx->dynamic_dso = NULL;
455 return 0;
456 }
457 /* We have to find a bind function otherwise it'll always end badly */
458 if (!
459 (ctx->bind_engine =
460 (dynamic_bind_engine) DSO_bind_func(ctx->dynamic_dso,
461 ctx->DYNAMIC_F2))) {
462 ctx->bind_engine = NULL;
463 DSO_free(ctx->dynamic_dso);
464 ctx->dynamic_dso = NULL;
465 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_FAILURE);
466 return 0;
467 }
468 /* Do we perform version checking? */
469 if (!ctx->no_vcheck) {
470 unsigned long vcheck_res = 0;
471 /*
472 * Now we try to find a version checking function and decide how to
473 * cope with failure if/when it fails.
474 */
475 ctx->v_check =
476 (dynamic_v_check_fn) DSO_bind_func(ctx->dynamic_dso,
477 ctx->DYNAMIC_F1);
478 if (ctx->v_check)
479 vcheck_res = ctx->v_check(OSSL_DYNAMIC_VERSION);
480 /*
481 * We fail if the version checker veto'd the load *or* if it is
482 * deferring to us (by returning its version) and we think it is too
483 * old.
484 */
485 if (vcheck_res < OSSL_DYNAMIC_OLDEST) {
486 /* Fail */
487 ctx->bind_engine = NULL;
488 ctx->v_check = NULL;
489 DSO_free(ctx->dynamic_dso);
490 ctx->dynamic_dso = NULL;
491 ENGINEerr(ENGINE_F_DYNAMIC_LOAD,
492 ENGINE_R_VERSION_INCOMPATIBILITY);
493 return 0;
494 }
495 }
496 /*
497 * First binary copy the ENGINE structure so that we can roll back if the
498 * hand-over fails
499 */
500 memcpy(&cpy, e, sizeof(ENGINE));
501 /*
502 * Provide the ERR, "ex_data", memory, and locking callbacks so the
503 * loaded library uses our state rather than its own. FIXME: As noted in
504 * engine.h, much of this would be simplified if each area of code
505 * provided its own "summary" structure of all related callbacks. It
506 * would also increase opaqueness.
507 */
508 fns.static_state = ENGINE_get_static_state();
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509 CRYPTO_get_mem_functions(&fns.mem_fns.malloc_cb,
510 &fns.mem_fns.realloc_cb, &fns.mem_fns.free_cb);
511 fns.lock_fns.lock_locking_cb = CRYPTO_get_locking_callback();
512 fns.lock_fns.lock_add_lock_cb = CRYPTO_get_add_lock_callback();
513 fns.lock_fns.dynlock_create_cb = CRYPTO_get_dynlock_create_callback();
514 fns.lock_fns.dynlock_lock_cb = CRYPTO_get_dynlock_lock_callback();
515 fns.lock_fns.dynlock_destroy_cb = CRYPTO_get_dynlock_destroy_callback();
516 /*
517 * Now that we've loaded the dynamic engine, make sure no "dynamic"
518 * ENGINE elements will show through.
519 */
520 engine_set_all_null(e);
5b8a57ec 521
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MC
522 /* Try to bind the ENGINE onto our own ENGINE structure */
523 if (!ctx->bind_engine(e, ctx->engine_id, &fns)) {
524 ctx->bind_engine = NULL;
525 ctx->v_check = NULL;
526 DSO_free(ctx->dynamic_dso);
527 ctx->dynamic_dso = NULL;
528 ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_INIT_FAILED);
529 /* Copy the original ENGINE structure back */
530 memcpy(e, &cpy, sizeof(ENGINE));
531 return 0;
532 }
533 /* Do we try to add this ENGINE to the internal list too? */
534 if (ctx->list_add_value > 0) {
535 if (!ENGINE_add(e)) {
536 /* Do we tolerate this or fail? */
537 if (ctx->list_add_value > 1) {
538 /*
539 * Fail - NB: By this time, it's too late to rollback, and
540 * trying to do so allows the bind_engine() code to have
541 * created leaks. We just have to fail where we are, after
542 * the ENGINE has changed.
543 */
544 ENGINEerr(ENGINE_F_DYNAMIC_LOAD,
545 ENGINE_R_CONFLICTING_ENGINE_ID);
546 return 0;
547 }
548 /* Tolerate */
549 ERR_clear_error();
550 }
551 }
552 return 1;
553}