crypto/bio/bio_lib.c

   1 /*
   2  * Copyright 1995-2016 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
 102     return bio;
 103
 104 err:
 105     OPENSSL_free(bio);
 106     return NULL;
 107 }
 108
 109 int BIO_free(BIO *a)
 110 {
 111     int ret;
 112
 113     if (a == NULL)
 114         return 0;
 115
 116     if (CRYPTO_DOWN_REF(&a->references, &ret, a->lock) <= 0)
 117         return 0;
 118
 119     REF_PRINT_COUNT("BIO", a);
 120     if (ret > 0)
 121         return 1;
 122     REF_ASSERT_ISNT(ret < 0);
 123
 124     if (a->callback != NULL || a->callback_ex != NULL) {
 125         ret = (int)bio_call_callback(a, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL);
 126         if (ret <= 0)
 127             return ret;
 128     }
 129
 130     if ((a->method != NULL) && (a->method->destroy != NULL))
 131         a->method->destroy(a);
 132
 133     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
 134
 135     CRYPTO_THREAD_lock_free(a->lock);
 136
 137     OPENSSL_free(a);
 138
 139     return 1;
 140 }
 141
 142 void BIO_set_data(BIO *a, void *ptr)
 143 {
 144     a->ptr = ptr;
 145 }
 146
 147 void *BIO_get_data(BIO *a)
 148 {
 149     return a->ptr;
 150 }
 151
 152 void BIO_set_init(BIO *a, int init)
 153 {
 154     a->init = init;
 155 }
 156
 157 int BIO_get_init(BIO *a)
 158 {
 159     return a->init;
 160 }
 161
 162 void BIO_set_shutdown(BIO *a, int shut)
 163 {
 164     a->shutdown = shut;
 165 }
 166
 167 int BIO_get_shutdown(BIO *a)
 168 {
 169     return a->shutdown;
 170 }
 171
 172 void BIO_vfree(BIO *a)
 173 {
 174     BIO_free(a);
 175 }
 176
 177 int BIO_up_ref(BIO *a)
 178 {
 179     int i;
 180
 181     if (CRYPTO_UP_REF(&a->references, &i, a->lock) <= 0)
 182         return 0;
 183
 184     REF_PRINT_COUNT("BIO", a);
 185     REF_ASSERT_ISNT(i < 2);
 186     return ((i > 1) ? 1 : 0);
 187 }
 188
 189 void BIO_clear_flags(BIO *b, int flags)
 190 {
 191     b->flags &= ~flags;
 192 }
 193
 194 int BIO_test_flags(const BIO *b, int flags)
 195 {
 196     return (b->flags & flags);
 197 }
 198
 199 void BIO_set_flags(BIO *b, int flags)
 200 {
 201     b->flags |= flags;
 202 }
 203
 204 BIO_callback_fn BIO_get_callback(const BIO *b)
 205 {
 206     return b->callback;
 207 }
 208
 209 void BIO_set_callback(BIO *b, BIO_callback_fn cb)
 210 {
 211     b->callback = cb;
 212 }
 213
 214 BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b)
 215 {
 216     return b->callback_ex;
 217 }
 218
 219 void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex cb)
 220 {
 221     b->callback_ex = cb;
 222 }
 223
 224 void BIO_set_callback_arg(BIO *b, char *arg)
 225 {
 226     b->cb_arg = arg;
 227 }
 228
 229 char *BIO_get_callback_arg(const BIO *b)
 230 {
 231     return b->cb_arg;
 232 }
 233
 234 const char *BIO_method_name(const BIO *b)
 235 {
 236     return b->method->name;
 237 }
 238
 239 int BIO_method_type(const BIO *b)
 240 {
 241     return b->method->type;
 242 }
 243
 244 /*
 245  * This is essentially the same as BIO_read_ex() except that it allows
 246  * 0 or a negative value to indicate failure (retryable or not) in the return.
 247  * This is for compatibility with the old style BIO_read(), where existing code
 248  * may make assumptions about the return value that it might get.
 249  */
 250 static int bio_read_intern(BIO *b, void *data, size_t dlen, size_t *readbytes)
 251 {
 252     int ret;
 253
 254     if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL)) {
 255         BIOerr(BIO_F_BIO_READ_INTERN, BIO_R_UNSUPPORTED_METHOD);
 256         return -2;
 257     }
 258
 259     if ((b->callback != NULL || b->callback_ex != NULL) &&
 260         ((ret = (int)bio_call_callback(b, BIO_CB_READ, data, dlen, 0, 0L, 1L,
 261                                        readbytes)) <= 0))
 262         return ret;
 263
 264     if (!b->init) {
 265         BIOerr(BIO_F_BIO_READ_INTERN, BIO_R_UNINITIALIZED);
 266         return -2;
 267     }
 268
 269     ret = b->method->bread(b, data, dlen, readbytes);
 270
 271     if (ret > 0)
 272         b->num_read += (uint64_t)*read;
 273
 274     if (b->callback != NULL || b->callback_ex != NULL)
 275         ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, data,
 276                                      dlen, 0, 0L, ret, readbytes);
 277
 278     /* Shouldn't happen */
 279     if (ret > 0 && *readbytes > dlen) {
 280         BIOerr(BIO_F_BIO_READ_INTERN, ERR_R_INTERNAL_ERROR);
 281         return -1;
 282     }
 283
 284     return ret;
 285 }
 286
 287 int BIO_read(BIO *b, void *data, int dlen)
 288 {
 289     size_t readbytes;
 290     int ret;
 291
 292     if (dlen < 0)
 293         return 0;
 294
 295     ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
 296
 297     if (ret > 0) {
 298         /* *readbytes should always be <= dlen */
 299         ret = (int)readbytes;
 300     }
 301
 302     return ret;
 303 }
 304
 305 int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes)
 306 {
 307     int ret;
 308
 309     ret = bio_read_intern(b, data, dlen, readbytes);
 310
 311     if (ret > 0)
 312         ret = 1;
 313     else
 314         ret = 0;
 315
 316     return ret;
 317 }
 318
 319 static int bio_write_intern(BIO *b, const void *data, size_t dlen,
 320                             size_t *written)
 321 {
 322     int ret;
 323
 324     if (b == NULL)
 325         return 0;
 326
 327     if ((b->method == NULL) || (b->method->bwrite == NULL)) {
 328         BIOerr(BIO_F_BIO_WRITE_INTERN, BIO_R_UNSUPPORTED_METHOD);
 329         return -2;
 330     }
 331
 332     if ((b->callback != NULL || b->callback_ex != NULL) &&
 333         ((ret = (int)bio_call_callback(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L,
 334                                        written)) <= 0))
 335         return ret;
 336
 337     if (!b->init) {
 338         BIOerr(BIO_F_BIO_WRITE_INTERN, BIO_R_UNINITIALIZED);
 339         return -2;
 340     }
 341
 342     ret = b->method->bwrite(b, data, dlen, written);
 343
 344     if (ret > 0)
 345         b->num_write += (uint64_t)*written;
 346
 347     if (b->callback != NULL || b->callback_ex != NULL)
 348         ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, data,
 349                                      dlen, 0, 0L, ret, written);
 350
 351     return ret;
 352 }
 353
 354 int BIO_write(BIO *b, const void *data, int dlen)
 355 {
 356     size_t written;
 357     int ret;
 358
 359     if (dlen < 0)
 360         return 0;
 361
 362     ret = bio_write_intern(b, data, (size_t)dlen, &written);
 363
 364     if (ret > 0) {
 365         /* *written should always be <= dlen */
 366         ret = (int)written;
 367     }
 368
 369     return ret;
 370 }
 371
 372 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
 373 {
 374     int ret;
 375
 376     ret = bio_write_intern(b, data, dlen, written);
 377
 378     if (ret > 0)
 379         ret = 1;
 380     else
 381         ret = 0;
 382
 383     return ret;
 384 }
 385
 386 int BIO_puts(BIO *b, const char *buf)
 387 {
 388     int ret;
 389     size_t written = 0;
 390
 391     if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL)) {
 392         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNSUPPORTED_METHOD);
 393         return -2;
 394     }
 395
 396     if (b->callback != NULL || b->callback_ex != NULL) {
 397         ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
 398         if (ret <= 0)
 399             return ret;
 400     }
 401
 402     if (!b->init) {
 403         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNINITIALIZED);
 404         return -2;
 405     }
 406
 407     ret = b->method->bputs(b, buf);
 408
 409     if (ret > 0) {
 410         b->num_write += (uint64_t)ret;
 411         written = ret;
 412         ret = 1;
 413     }
 414
 415     if (b->callback != NULL || b->callback_ex != NULL)
 416         ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
 417                                      0L, ret, &written);
 418
 419     if (ret > 0) {
 420         if (written > INT_MAX) {
 421             BIOerr(BIO_F_BIO_PUTS, BIO_R_LENGTH_TOO_LONG);
 422             ret = -1;
 423         } else {
 424             ret = (int)written;
 425         }
 426     }
 427
 428     return ret;
 429 }
 430
 431 int BIO_gets(BIO *b, char *buf, int size)
 432 {
 433     int ret;
 434     size_t readbytes = 0;
 435
 436     if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL)) {
 437         BIOerr(BIO_F_BIO_GETS, BIO_R_UNSUPPORTED_METHOD);
 438         return (-2);
 439     }
 440
 441     if (size < 0) {
 442         BIOerr(BIO_F_BIO_GETS, BIO_R_INVALID_ARGUMENT);
 443         return 0;
 444     }
 445
 446     if (b->callback != NULL || b->callback_ex != NULL) {
 447         ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
 448         if (ret <= 0)
 449             return ret;
 450     }
 451
 452     if (!b->init) {
 453         BIOerr(BIO_F_BIO_GETS, BIO_R_UNINITIALIZED);
 454         return (-2);
 455     }
 456
 457     ret = b->method->bgets(b, buf, size);
 458
 459     if (ret > 0) {
 460         readbytes = ret;
 461         ret = 1;
 462     }
 463
 464     if (b->callback != NULL || b->callback_ex != NULL)
 465         ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
 466                                      0, 0L, ret, &readbytes);
 467
 468     if (ret > 0) {
 469         /* Shouldn't happen */
 470         if (readbytes > (size_t)size)
 471             ret = -1;
 472         else
 473             ret = (int)readbytes;
 474     }
 475
 476     return ret;
 477 }
 478
 479 int BIO_indent(BIO *b, int indent, int max)
 480 {
 481     if (indent < 0)
 482         indent = 0;
 483     if (indent > max)
 484         indent = max;
 485     while (indent--)
 486         if (BIO_puts(b, " ") != 1)
 487             return 0;
 488     return 1;
 489 }
 490
 491 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
 492 {
 493     int i;
 494
 495     i = iarg;
 496     return (BIO_ctrl(b, cmd, larg, (char *)&i));
 497 }
 498
 499 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
 500 {
 501     void *p = NULL;
 502
 503     if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
 504         return (NULL);
 505     else
 506         return (p);
 507 }
 508
 509 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
 510 {
 511     long ret;
 512
 513     if (b == NULL)
 514         return 0;
 515
 516     if ((b->method == NULL) || (b->method->ctrl == NULL)) {
 517         BIOerr(BIO_F_BIO_CTRL, BIO_R_UNSUPPORTED_METHOD);
 518         return -2;
 519     }
 520
 521     if (b->callback != NULL || b->callback_ex != NULL) {
 522         ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
 523         if (ret <= 0)
 524             return ret;
 525     }
 526
 527     ret = b->method->ctrl(b, cmd, larg, parg);
 528
 529     if (b->callback != NULL || b->callback_ex != NULL)
 530         ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
 531                                 larg, ret, NULL);
 532
 533     return ret;
 534 }
 535
 536 long BIO_callback_ctrl(BIO *b, int cmd,
 537                        void (*fp) (struct bio_st *, int, const char *, int,
 538                                    long, long))
 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 }