crypto/bio/bio_lib.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <errno.h>
  12 #include <openssl/crypto.h>
  13 #include "bio_lcl.h"
  14 #include "internal/cryptlib.h"
  15
  16
  17 /*
  18  * Helper macro for the callback to determine whether an operator expects a
  19  * len parameter or not
  20  */
  21 #define HAS_LEN_OPER(o)        ((o) == BIO_CB_READ || (o) == BIO_CB_WRITE || \
  22                                 (o) == BIO_CB_GETS)
  23
  24 /*
  25  * Helper function to work out whether to call the new style callback or the old
  26  * one, and translate between the two.
  27  *
  28  * This has a long return type for consistency with the old callback. Similarly
  29  * for the "long" used for "inret"
  30  */
  31 static long bio_call_callback(BIO *b, int oper, const char *argp, size_t len,
  32                               int argi, long argl, long inret, size_t *processed)
  33 {
  34     long ret;
  35     int bareoper;
  36
  37     if (b->callback_ex != NULL) {
  38         return b->callback_ex(b, oper, argp, len, argi, argl, inret, processed);
  39     }
  40
  41     /* Strip off any BIO_CB_RETURN flag */
  42     bareoper = oper & ~BIO_CB_RETURN;
  43
  44     /*
  45      * We have an old style callback, so we will have to do nasty casts and
  46      * check for overflows.
  47      */
  48     if (HAS_LEN_OPER(bareoper)) {
  49         /* In this case |len| is set, and should be used instead of |argi| */
  50         if (len > INT_MAX)
  51             return -1;
  52
  53         argi = (int)len;
  54
  55         if (inret && (oper & BIO_CB_RETURN)) {
  56             if (*processed > INT_MAX)
  57                 return -1;
  58             inret = *processed;
  59         }
  60     }
  61
  62     ret = b->callback(b, oper, argp, argi, argl, inret);
  63
  64     if (ret >= 0 && (HAS_LEN_OPER(bareoper) || bareoper == BIO_CB_PUTS)) {
  65         *processed = (size_t)ret;
  66         ret = 1;
  67     }
  68
  69     return ret;
  70 }
  71
  72 BIO *BIO_new(const BIO_METHOD *method)
  73 {
  74     BIO *bio = OPENSSL_zalloc(sizeof(*bio));
  75
  76     if (bio == NULL) {
  77         BIOerr(BIO_F_BIO_NEW, ERR_R_MALLOC_FAILURE);
  78         return NULL;
  79     }
  80
  81     bio->method = method;
  82     bio->shutdown = 1;
  83     bio->references = 1;
  84
  85     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data))
  86         goto err;
  87
  88     bio->lock = CRYPTO_THREAD_lock_new();
  89     if (bio->lock == NULL) {
  90         BIOerr(BIO_F_BIO_NEW, ERR_R_MALLOC_FAILURE);
  91         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
  92         goto err;
  93     }
  94
  95     if (method->create != NULL && !method->create(bio)) {
  96         BIOerr(BIO_F_BIO_NEW, ERR_R_INIT_FAIL);
  97         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
  98         CRYPTO_THREAD_lock_free(bio->lock);
  99         goto err;
 100     }
 101     if (method->create == NULL)
 102         bio->init = 1;
 103
 104     return bio;
 105
 106 err:
 107     OPENSSL_free(bio);
 108     return NULL;
 109 }
 110
 111 int BIO_free(BIO *a)
 112 {
 113     int ret;
 114
 115     if (a == NULL)
 116         return 0;
 117
 118     if (CRYPTO_DOWN_REF(&a->references, &ret, a->lock) <= 0)
 119         return 0;
 120
 121     REF_PRINT_COUNT("BIO", a);
 122     if (ret > 0)
 123         return 1;
 124     REF_ASSERT_ISNT(ret < 0);
 125
 126     if (a->callback != NULL || a->callback_ex != NULL) {
 127         ret = (int)bio_call_callback(a, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL);
 128         if (ret <= 0)
 129             return ret;
 130     }
 131
 132     if ((a->method != NULL) && (a->method->destroy != NULL))
 133         a->method->destroy(a);
 134
 135     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
 136
 137     CRYPTO_THREAD_lock_free(a->lock);
 138
 139     OPENSSL_free(a);
 140
 141     return 1;
 142 }
 143
 144 void BIO_set_data(BIO *a, void *ptr)
 145 {
 146     a->ptr = ptr;
 147 }
 148
 149 void *BIO_get_data(BIO *a)
 150 {
 151     return a->ptr;
 152 }
 153
 154 void BIO_set_init(BIO *a, int init)
 155 {
 156     a->init = init;
 157 }
 158
 159 int BIO_get_init(BIO *a)
 160 {
 161     return a->init;
 162 }
 163
 164 void BIO_set_shutdown(BIO *a, int shut)
 165 {
 166     a->shutdown = shut;
 167 }
 168
 169 int BIO_get_shutdown(BIO *a)
 170 {
 171     return a->shutdown;
 172 }
 173
 174 void BIO_vfree(BIO *a)
 175 {
 176     BIO_free(a);
 177 }
 178
 179 int BIO_up_ref(BIO *a)
 180 {
 181     int i;
 182
 183     if (CRYPTO_UP_REF(&a->references, &i, a->lock) <= 0)
 184         return 0;
 185
 186     REF_PRINT_COUNT("BIO", a);
 187     REF_ASSERT_ISNT(i < 2);
 188     return ((i > 1) ? 1 : 0);
 189 }
 190
 191 void BIO_clear_flags(BIO *b, int flags)
 192 {
 193     b->flags &= ~flags;
 194 }
 195
 196 int BIO_test_flags(const BIO *b, int flags)
 197 {
 198     return (b->flags & flags);
 199 }
 200
 201 void BIO_set_flags(BIO *b, int flags)
 202 {
 203     b->flags |= flags;
 204 }
 205
 206 BIO_callback_fn BIO_get_callback(const BIO *b)
 207 {
 208     return b->callback;
 209 }
 210
 211 void BIO_set_callback(BIO *b, BIO_callback_fn cb)
 212 {
 213     b->callback = cb;
 214 }
 215
 216 BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b)
 217 {
 218     return b->callback_ex;
 219 }
 220
 221 void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex cb)
 222 {
 223     b->callback_ex = cb;
 224 }
 225
 226 void BIO_set_callback_arg(BIO *b, char *arg)
 227 {
 228     b->cb_arg = arg;
 229 }
 230
 231 char *BIO_get_callback_arg(const BIO *b)
 232 {
 233     return b->cb_arg;
 234 }
 235
 236 const char *BIO_method_name(const BIO *b)
 237 {
 238     return b->method->name;
 239 }
 240
 241 int BIO_method_type(const BIO *b)
 242 {
 243     return b->method->type;
 244 }
 245
 246 /*
 247  * This is essentially the same as BIO_read_ex() except that it allows
 248  * 0 or a negative value to indicate failure (retryable or not) in the return.
 249  * This is for compatibility with the old style BIO_read(), where existing code
 250  * may make assumptions about the return value that it might get.
 251  */
 252 static int bio_read_intern(BIO *b, void *data, size_t dlen, size_t *readbytes)
 253 {
 254     int ret;
 255
 256     if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL)) {
 257         BIOerr(BIO_F_BIO_READ_INTERN, BIO_R_UNSUPPORTED_METHOD);
 258         return -2;
 259     }
 260
 261     if ((b->callback != NULL || b->callback_ex != NULL) &&
 262         ((ret = (int)bio_call_callback(b, BIO_CB_READ, data, dlen, 0, 0L, 1L,
 263                                        readbytes)) <= 0))
 264         return ret;
 265
 266     if (!b->init) {
 267         BIOerr(BIO_F_BIO_READ_INTERN, BIO_R_UNINITIALIZED);
 268         return -2;
 269     }
 270
 271     ret = b->method->bread(b, data, dlen, readbytes);
 272
 273     if (ret > 0)
 274         b->num_read += (uint64_t)*readbytes;
 275
 276     if (b->callback != NULL || b->callback_ex != NULL)
 277         ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, data,
 278                                      dlen, 0, 0L, ret, readbytes);
 279
 280     /* Shouldn't happen */
 281     if (ret > 0 && *readbytes > dlen) {
 282         BIOerr(BIO_F_BIO_READ_INTERN, ERR_R_INTERNAL_ERROR);
 283         return -1;
 284     }
 285
 286     return ret;
 287 }
 288
 289 int BIO_read(BIO *b, void *data, int dlen)
 290 {
 291     size_t readbytes;
 292     int ret;
 293
 294     if (dlen < 0)
 295         return 0;
 296
 297     ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
 298
 299     if (ret > 0) {
 300         /* *readbytes should always be <= dlen */
 301         ret = (int)readbytes;
 302     }
 303
 304     return ret;
 305 }
 306
 307 int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes)
 308 {
 309     int ret;
 310
 311     ret = bio_read_intern(b, data, dlen, readbytes);
 312
 313     if (ret > 0)
 314         ret = 1;
 315     else
 316         ret = 0;
 317
 318     return ret;
 319 }
 320
 321 static int bio_write_intern(BIO *b, const void *data, size_t dlen,
 322                             size_t *written)
 323 {
 324     int ret;
 325
 326     if (b == NULL)
 327         return 0;
 328
 329     if ((b->method == NULL) || (b->method->bwrite == NULL)) {
 330         BIOerr(BIO_F_BIO_WRITE_INTERN, BIO_R_UNSUPPORTED_METHOD);
 331         return -2;
 332     }
 333
 334     if ((b->callback != NULL || b->callback_ex != NULL) &&
 335         ((ret = (int)bio_call_callback(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L,
 336                                        written)) <= 0))
 337         return ret;
 338
 339     if (!b->init) {
 340         BIOerr(BIO_F_BIO_WRITE_INTERN, BIO_R_UNINITIALIZED);
 341         return -2;
 342     }
 343
 344     ret = b->method->bwrite(b, data, dlen, written);
 345
 346     if (ret > 0)
 347         b->num_write += (uint64_t)*written;
 348
 349     if (b->callback != NULL || b->callback_ex != NULL)
 350         ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, data,
 351                                      dlen, 0, 0L, ret, written);
 352
 353     return ret;
 354 }
 355
 356 int BIO_write(BIO *b, const void *data, int dlen)
 357 {
 358     size_t written;
 359     int ret;
 360
 361     if (dlen < 0)
 362         return 0;
 363
 364     ret = bio_write_intern(b, data, (size_t)dlen, &written);
 365
 366     if (ret > 0) {
 367         /* *written should always be <= dlen */
 368         ret = (int)written;
 369     }
 370
 371     return ret;
 372 }
 373
 374 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
 375 {
 376     int ret;
 377
 378     ret = bio_write_intern(b, data, dlen, written);
 379
 380     if (ret > 0)
 381         ret = 1;
 382     else
 383         ret = 0;
 384
 385     return ret;
 386 }
 387
 388 int BIO_puts(BIO *b, const char *buf)
 389 {
 390     int ret;
 391     size_t written = 0;
 392
 393     if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL)) {
 394         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNSUPPORTED_METHOD);
 395         return -2;
 396     }
 397
 398     if (b->callback != NULL || b->callback_ex != NULL) {
 399         ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
 400         if (ret <= 0)
 401             return ret;
 402     }
 403
 404     if (!b->init) {
 405         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNINITIALIZED);
 406         return -2;
 407     }
 408
 409     ret = b->method->bputs(b, buf);
 410
 411     if (ret > 0) {
 412         b->num_write += (uint64_t)ret;
 413         written = ret;
 414         ret = 1;
 415     }
 416
 417     if (b->callback != NULL || b->callback_ex != NULL)
 418         ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
 419                                      0L, ret, &written);
 420
 421     if (ret > 0) {
 422         if (written > INT_MAX) {
 423             BIOerr(BIO_F_BIO_PUTS, BIO_R_LENGTH_TOO_LONG);
 424             ret = -1;
 425         } else {
 426             ret = (int)written;
 427         }
 428     }
 429
 430     return ret;
 431 }
 432
 433 int BIO_gets(BIO *b, char *buf, int size)
 434 {
 435     int ret;
 436     size_t readbytes = 0;
 437
 438     if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL)) {
 439         BIOerr(BIO_F_BIO_GETS, BIO_R_UNSUPPORTED_METHOD);
 440         return -2;
 441     }
 442
 443     if (size < 0) {
 444         BIOerr(BIO_F_BIO_GETS, BIO_R_INVALID_ARGUMENT);
 445         return 0;
 446     }
 447
 448     if (b->callback != NULL || b->callback_ex != NULL) {
 449         ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
 450         if (ret <= 0)
 451             return ret;
 452     }
 453
 454     if (!b->init) {
 455         BIOerr(BIO_F_BIO_GETS, BIO_R_UNINITIALIZED);
 456         return -2;
 457     }
 458
 459     ret = b->method->bgets(b, buf, size);
 460
 461     if (ret > 0) {
 462         readbytes = ret;
 463         ret = 1;
 464     }
 465
 466     if (b->callback != NULL || b->callback_ex != NULL)
 467         ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
 468                                      0, 0L, ret, &readbytes);
 469
 470     if (ret > 0) {
 471         /* Shouldn't happen */
 472         if (readbytes > (size_t)size)
 473             ret = -1;
 474         else
 475             ret = (int)readbytes;
 476     }
 477
 478     return ret;
 479 }
 480
 481 int BIO_indent(BIO *b, int indent, int max)
 482 {
 483     if (indent < 0)
 484         indent = 0;
 485     if (indent > max)
 486         indent = max;
 487     while (indent--)
 488         if (BIO_puts(b, " ") != 1)
 489             return 0;
 490     return 1;
 491 }
 492
 493 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
 494 {
 495     int i;
 496
 497     i = iarg;
 498     return BIO_ctrl(b, cmd, larg, (char *)&i);
 499 }
 500
 501 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
 502 {
 503     void *p = NULL;
 504
 505     if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
 506         return NULL;
 507     else
 508         return p;
 509 }
 510
 511 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
 512 {
 513     long ret;
 514
 515     if (b == NULL)
 516         return 0;
 517
 518     if ((b->method == NULL) || (b->method->ctrl == NULL)) {
 519         BIOerr(BIO_F_BIO_CTRL, BIO_R_UNSUPPORTED_METHOD);
 520         return -2;
 521     }
 522
 523     if (b->callback != NULL || b->callback_ex != NULL) {
 524         ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
 525         if (ret <= 0)
 526             return ret;
 527     }
 528
 529     ret = b->method->ctrl(b, cmd, larg, parg);
 530
 531     if (b->callback != NULL || b->callback_ex != NULL)
 532         ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
 533                                 larg, ret, NULL);
 534
 535     return ret;
 536 }
 537
 538 long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
 539 {
 540     long ret;
 541
 542     if (b == NULL)
 543         return 0;
 544
 545     if ((b->method == NULL) || (b->method->callback_ctrl == NULL)) {
 546         BIOerr(BIO_F_BIO_CALLBACK_CTRL, BIO_R_UNSUPPORTED_METHOD);
 547         return -2;
 548     }
 549
 550     if (b->callback != NULL || b->callback_ex != NULL) {
 551         ret = bio_call_callback(b, BIO_CB_CTRL, (void *)&fp, 0, cmd, 0, 1L,
 552                                 NULL);
 553         if (ret <= 0)
 554             return ret;
 555     }
 556
 557     ret = b->method->callback_ctrl(b, cmd, fp);
 558
 559     if (b->callback != NULL || b->callback_ex != NULL)
 560         ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, 0,
 561                                 cmd, 0, ret, NULL);
 562
 563     return ret;
 564 }
 565
 566 /*
 567  * It is unfortunate to duplicate in functions what the BIO_(w)pending macros
 568  * do; but those macros have inappropriate return type, and for interfacing
 569  * from other programming languages, C macros aren't much of a help anyway.
 570  */
 571 size_t BIO_ctrl_pending(BIO *bio)
 572 {
 573     return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);
 574 }
 575
 576 size_t BIO_ctrl_wpending(BIO *bio)
 577 {
 578     return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);
 579 }
 580
 581 /* put the 'bio' on the end of b's list of operators */
 582 BIO *BIO_push(BIO *b, BIO *bio)
 583 {
 584     BIO *lb;
 585
 586     if (b == NULL)
 587         return bio;
 588     lb = b;
 589     while (lb->next_bio != NULL)
 590         lb = lb->next_bio;
 591     lb->next_bio = bio;
 592     if (bio != NULL)
 593         bio->prev_bio = lb;
 594     /* called to do internal processing */
 595     BIO_ctrl(b, BIO_CTRL_PUSH, 0, lb);
 596     return b;
 597 }
 598
 599 /* Remove the first and return the rest */
 600 BIO *BIO_pop(BIO *b)
 601 {
 602     BIO *ret;
 603
 604     if (b == NULL)
 605         return NULL;
 606     ret = b->next_bio;
 607
 608     BIO_ctrl(b, BIO_CTRL_POP, 0, b);
 609
 610     if (b->prev_bio != NULL)
 611         b->prev_bio->next_bio = b->next_bio;
 612     if (b->next_bio != NULL)
 613         b->next_bio->prev_bio = b->prev_bio;
 614
 615     b->next_bio = NULL;
 616     b->prev_bio = NULL;
 617     return ret;
 618 }
 619
 620 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
 621 {
 622     BIO *b, *last;
 623
 624     b = last = bio;
 625     for (;;) {
 626         if (!BIO_should_retry(b))
 627             break;
 628         last = b;
 629         b = b->next_bio;
 630         if (b == NULL)
 631             break;
 632     }
 633     if (reason != NULL)
 634         *reason = last->retry_reason;
 635     return last;
 636 }
 637
 638 int BIO_get_retry_reason(BIO *bio)
 639 {
 640     return bio->retry_reason;
 641 }
 642
 643 void BIO_set_retry_reason(BIO *bio, int reason)
 644 {
 645     bio->retry_reason = reason;
 646 }
 647
 648 BIO *BIO_find_type(BIO *bio, int type)
 649 {
 650     int mt, mask;
 651
 652     if (bio == NULL)
 653         return NULL;
 654     mask = type & 0xff;
 655     do {
 656         if (bio->method != NULL) {
 657             mt = bio->method->type;
 658
 659             if (!mask) {
 660                 if (mt & type)
 661                     return bio;
 662             } else if (mt == type)
 663                 return bio;
 664         }
 665         bio = bio->next_bio;
 666     } while (bio != NULL);
 667     return NULL;
 668 }
 669
 670 BIO *BIO_next(BIO *b)
 671 {
 672     if (b == NULL)
 673         return NULL;
 674     return b->next_bio;
 675 }
 676
 677 void BIO_set_next(BIO *b, BIO *next)
 678 {
 679     b->next_bio = next;
 680 }
 681
 682 void BIO_free_all(BIO *bio)
 683 {
 684     BIO *b;
 685     int ref;
 686
 687     while (bio != NULL) {
 688         b = bio;
 689         ref = b->references;
 690         bio = bio->next_bio;
 691         BIO_free(b);
 692         /* Since ref count > 1, don't free anyone else. */
 693         if (ref > 1)
 694             break;
 695     }
 696 }
 697
 698 BIO *BIO_dup_chain(BIO *in)
 699 {
 700     BIO *ret = NULL, *eoc = NULL, *bio, *new_bio;
 701
 702     for (bio = in; bio != NULL; bio = bio->next_bio) {
 703         if ((new_bio = BIO_new(bio->method)) == NULL)
 704             goto err;
 705         new_bio->callback = bio->callback;
 706         new_bio->callback_ex = bio->callback_ex;
 707         new_bio->cb_arg = bio->cb_arg;
 708         new_bio->init = bio->init;
 709         new_bio->shutdown = bio->shutdown;
 710         new_bio->flags = bio->flags;
 711
 712         /* This will let SSL_s_sock() work with stdin/stdout */
 713         new_bio->num = bio->num;
 714
 715         if (!BIO_dup_state(bio, (char *)new_bio)) {
 716             BIO_free(new_bio);
 717             goto err;
 718         }
 719
 720         /* copy app data */
 721         if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new_bio->ex_data,
 722                                 &bio->ex_data)) {
 723             BIO_free(new_bio);
 724             goto err;
 725         }
 726
 727         if (ret == NULL) {
 728             eoc = new_bio;
 729             ret = eoc;
 730         } else {
 731             BIO_push(eoc, new_bio);
 732             eoc = new_bio;
 733         }
 734     }
 735     return ret;
 736  err:
 737     BIO_free_all(ret);
 738
 739     return NULL;
 740 }
 741
 742 void BIO_copy_next_retry(BIO *b)
 743 {
 744     BIO_set_flags(b, BIO_get_retry_flags(b->next_bio));
 745     b->retry_reason = b->next_bio->retry_reason;
 746 }
 747
 748 int BIO_set_ex_data(BIO *bio, int idx, void *data)
 749 {
 750     return CRYPTO_set_ex_data(&(bio->ex_data), idx, data);
 751 }
 752
 753 void *BIO_get_ex_data(BIO *bio, int idx)
 754 {
 755     return CRYPTO_get_ex_data(&(bio->ex_data), idx);
 756 }
 757
 758 uint64_t BIO_number_read(BIO *bio)
 759 {
 760     if (bio)
 761         return bio->num_read;
 762     return 0;
 763 }
 764
 765 uint64_t BIO_number_written(BIO *bio)
 766 {
 767     if (bio)
 768         return bio->num_write;
 769     return 0;
 770 }
 771
 772 void bio_free_ex_data(BIO *bio)
 773 {
 774     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
 775 }
 776
 777 void bio_cleanup(void)
 778 {
 779 #ifndef OPENSSL_NO_SOCK
 780     bio_sock_cleanup_int();
 781     CRYPTO_THREAD_lock_free(bio_lookup_lock);
 782     bio_lookup_lock = NULL;
 783 #endif
 784     CRYPTO_THREAD_lock_free(bio_type_lock);
 785     bio_type_lock = NULL;
 786 }