crypto/bio/bio_lib.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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_local.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     /* Strip off any BIO_CB_RETURN flag */
  41     bareoper = oper & ~BIO_CB_RETURN;
  42
  43     /*
  44      * We have an old style callback, so we will have to do nasty casts and
  45      * check for overflows.
  46      */
  47     if (HAS_LEN_OPER(bareoper)) {
  48         /* In this case |len| is set, and should be used instead of |argi| */
  49         if (len > INT_MAX)
  50             return -1;
  51
  52         argi = (int)len;
  53     }
  54
  55     if (inret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
  56         if (*processed > INT_MAX)
  57             return -1;
  58         inret = *processed;
  59     }
  60
  61     ret = b->callback(b, oper, argp, argi, argl, inret);
  62
  63     if (ret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
  64         *processed = (size_t)ret;
  65         ret = 1;
  66     }
  67
  68     return ret;
  69 }
  70
  71 BIO *BIO_new(const BIO_METHOD *method)
  72 {
  73     BIO *bio = OPENSSL_zalloc(sizeof(*bio));
  74
  75     if (bio == NULL) {
  76         BIOerr(BIO_F_BIO_NEW, ERR_R_MALLOC_FAILURE);
  77         return NULL;
  78     }
  79
  80     bio->method = method;
  81     bio->shutdown = 1;
  82     bio->references = 1;
  83
  84     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data))
  85         goto err;
  86
  87     bio->lock = CRYPTO_THREAD_lock_new();
  88     if (bio->lock == NULL) {
  89         BIOerr(BIO_F_BIO_NEW, ERR_R_MALLOC_FAILURE);
  90         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
  91         goto err;
  92     }
  93
  94     if (method->create != NULL && !method->create(bio)) {
  95         BIOerr(BIO_F_BIO_NEW, ERR_R_INIT_FAIL);
  96         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
  97         CRYPTO_THREAD_lock_free(bio->lock);
  98         goto err;
  99     }
 100     if (method->create == NULL)
 101         bio->init = 1;
 102
 103     return bio;
 104
 105 err:
 106     OPENSSL_free(bio);
 107     return NULL;
 108 }
 109
 110 int BIO_free(BIO *a)
 111 {
 112     int ret;
 113
 114     if (a == NULL)
 115         return 0;
 116
 117     if (CRYPTO_DOWN_REF(&a->references, &ret, a->lock) <= 0)
 118         return 0;
 119
 120     REF_PRINT_COUNT("BIO", a);
 121     if (ret > 0)
 122         return 1;
 123     REF_ASSERT_ISNT(ret < 0);
 124
 125     if (a->callback != NULL || a->callback_ex != NULL) {
 126         ret = (int)bio_call_callback(a, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL);
 127         if (ret <= 0)
 128             return ret;
 129     }
 130
 131     if ((a->method != NULL) && (a->method->destroy != NULL))
 132         a->method->destroy(a);
 133
 134     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
 135
 136     CRYPTO_THREAD_lock_free(a->lock);
 137
 138     OPENSSL_free(a);
 139
 140     return 1;
 141 }
 142
 143 void BIO_set_data(BIO *a, void *ptr)
 144 {
 145     a->ptr = ptr;
 146 }
 147
 148 void *BIO_get_data(BIO *a)
 149 {
 150     return a->ptr;
 151 }
 152
 153 void BIO_set_init(BIO *a, int init)
 154 {
 155     a->init = init;
 156 }
 157
 158 int BIO_get_init(BIO *a)
 159 {
 160     return a->init;
 161 }
 162
 163 void BIO_set_shutdown(BIO *a, int shut)
 164 {
 165     a->shutdown = shut;
 166 }
 167
 168 int BIO_get_shutdown(BIO *a)
 169 {
 170     return a->shutdown;
 171 }
 172
 173 void BIO_vfree(BIO *a)
 174 {
 175     BIO_free(a);
 176 }
 177
 178 int BIO_up_ref(BIO *a)
 179 {
 180     int i;
 181
 182     if (CRYPTO_UP_REF(&a->references, &i, a->lock) <= 0)
 183         return 0;
 184
 185     REF_PRINT_COUNT("BIO", a);
 186     REF_ASSERT_ISNT(i < 2);
 187     return ((i > 1) ? 1 : 0);
 188 }
 189
 190 void BIO_clear_flags(BIO *b, int flags)
 191 {
 192     b->flags &= ~flags;
 193 }
 194
 195 int BIO_test_flags(const BIO *b, int flags)
 196 {
 197     return (b->flags & flags);
 198 }
 199
 200 void BIO_set_flags(BIO *b, int flags)
 201 {
 202     b->flags |= flags;
 203 }
 204
 205 BIO_callback_fn BIO_get_callback(const BIO *b)
 206 {
 207     return b->callback;
 208 }
 209
 210 void BIO_set_callback(BIO *b, BIO_callback_fn cb)
 211 {
 212     b->callback = cb;
 213 }
 214
 215 BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b)
 216 {
 217     return b->callback_ex;
 218 }
 219
 220 void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex cb)
 221 {
 222     b->callback_ex = cb;
 223 }
 224
 225 void BIO_set_callback_arg(BIO *b, char *arg)
 226 {
 227     b->cb_arg = arg;
 228 }
 229
 230 char *BIO_get_callback_arg(const BIO *b)
 231 {
 232     return b->cb_arg;
 233 }
 234
 235 const char *BIO_method_name(const BIO *b)
 236 {
 237     return b->method->name;
 238 }
 239
 240 int BIO_method_type(const BIO *b)
 241 {
 242     return b->method->type;
 243 }
 244
 245 /*
 246  * This is essentially the same as BIO_read_ex() except that it allows
 247  * 0 or a negative value to indicate failure (retryable or not) in the return.
 248  * This is for compatibility with the old style BIO_read(), where existing code
 249  * may make assumptions about the return value that it might get.
 250  */
 251 static int bio_read_intern(BIO *b, void *data, size_t dlen, size_t *readbytes)
 252 {
 253     int ret;
 254
 255     if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL)) {
 256         BIOerr(BIO_F_BIO_READ_INTERN, BIO_R_UNSUPPORTED_METHOD);
 257         return -2;
 258     }
 259
 260     if ((b->callback != NULL || b->callback_ex != NULL) &&
 261         ((ret = (int)bio_call_callback(b, BIO_CB_READ, data, dlen, 0, 0L, 1L,
 262                                        NULL)) <= 0))
 263         return ret;
 264
 265     if (!b->init) {
 266         BIOerr(BIO_F_BIO_READ_INTERN, BIO_R_UNINITIALIZED);
 267         return -2;
 268     }
 269
 270     ret = b->method->bread(b, data, dlen, readbytes);
 271
 272     if (ret > 0)
 273         b->num_read += (uint64_t)*readbytes;
 274
 275     if (b->callback != NULL || b->callback_ex != NULL)
 276         ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, data,
 277                                      dlen, 0, 0L, ret, readbytes);
 278
 279     /* Shouldn't happen */
 280     if (ret > 0 && *readbytes > dlen) {
 281         BIOerr(BIO_F_BIO_READ_INTERN, ERR_R_INTERNAL_ERROR);
 282         return -1;
 283     }
 284
 285     return ret;
 286 }
 287
 288 int BIO_read(BIO *b, void *data, int dlen)
 289 {
 290     size_t readbytes;
 291     int ret;
 292
 293     if (dlen < 0)
 294         return 0;
 295
 296     ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
 297
 298     if (ret > 0) {
 299         /* *readbytes should always be <= dlen */
 300         ret = (int)readbytes;
 301     }
 302
 303     return ret;
 304 }
 305
 306 int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes)
 307 {
 308     int ret;
 309
 310     ret = bio_read_intern(b, data, dlen, readbytes);
 311
 312     if (ret > 0)
 313         ret = 1;
 314     else
 315         ret = 0;
 316
 317     return ret;
 318 }
 319
 320 static int bio_write_intern(BIO *b, const void *data, size_t dlen,
 321                             size_t *written)
 322 {
 323     int ret;
 324
 325     if (b == NULL)
 326         return 0;
 327
 328     if ((b->method == NULL) || (b->method->bwrite == NULL)) {
 329         BIOerr(BIO_F_BIO_WRITE_INTERN, BIO_R_UNSUPPORTED_METHOD);
 330         return -2;
 331     }
 332
 333     if ((b->callback != NULL || b->callback_ex != NULL) &&
 334         ((ret = (int)bio_call_callback(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L,
 335                                        NULL)) <= 0))
 336         return ret;
 337
 338     if (!b->init) {
 339         BIOerr(BIO_F_BIO_WRITE_INTERN, BIO_R_UNINITIALIZED);
 340         return -2;
 341     }
 342
 343     ret = b->method->bwrite(b, data, dlen, written);
 344
 345     if (ret > 0)
 346         b->num_write += (uint64_t)*written;
 347
 348     if (b->callback != NULL || b->callback_ex != NULL)
 349         ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, data,
 350                                      dlen, 0, 0L, ret, written);
 351
 352     return ret;
 353 }
 354
 355 int BIO_write(BIO *b, const void *data, int dlen)
 356 {
 357     size_t written;
 358     int ret;
 359
 360     if (dlen < 0)
 361         return 0;
 362
 363     ret = bio_write_intern(b, data, (size_t)dlen, &written);
 364
 365     if (ret > 0) {
 366         /* *written should always be <= dlen */
 367         ret = (int)written;
 368     }
 369
 370     return ret;
 371 }
 372
 373 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
 374 {
 375     int ret;
 376
 377     ret = bio_write_intern(b, data, dlen, written);
 378
 379     if (ret > 0)
 380         ret = 1;
 381     else
 382         ret = 0;
 383
 384     return ret;
 385 }
 386
 387 int BIO_puts(BIO *b, const char *buf)
 388 {
 389     int ret;
 390     size_t written = 0;
 391
 392     if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL)) {
 393         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNSUPPORTED_METHOD);
 394         return -2;
 395     }
 396
 397     if (b->callback != NULL || b->callback_ex != NULL) {
 398         ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
 399         if (ret <= 0)
 400             return ret;
 401     }
 402
 403     if (!b->init) {
 404         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNINITIALIZED);
 405         return -2;
 406     }
 407
 408     ret = b->method->bputs(b, buf);
 409
 410     if (ret > 0) {
 411         b->num_write += (uint64_t)ret;
 412         written = ret;
 413         ret = 1;
 414     }
 415
 416     if (b->callback != NULL || b->callback_ex != NULL)
 417         ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
 418                                      0L, ret, &written);
 419
 420     if (ret > 0) {
 421         if (written > INT_MAX) {
 422             BIOerr(BIO_F_BIO_PUTS, BIO_R_LENGTH_TOO_LONG);
 423             ret = -1;
 424         } else {
 425             ret = (int)written;
 426         }
 427     }
 428
 429     return ret;
 430 }
 431
 432 int BIO_gets(BIO *b, char *buf, int size)
 433 {
 434     int ret;
 435     size_t readbytes = 0;
 436
 437     if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL)) {
 438         BIOerr(BIO_F_BIO_GETS, BIO_R_UNSUPPORTED_METHOD);
 439         return -2;
 440     }
 441
 442     if (size < 0) {
 443         BIOerr(BIO_F_BIO_GETS, BIO_R_INVALID_ARGUMENT);
 444         return 0;
 445     }
 446
 447     if (b->callback != NULL || b->callback_ex != NULL) {
 448         ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
 449         if (ret <= 0)
 450             return ret;
 451     }
 452
 453     if (!b->init) {
 454         BIOerr(BIO_F_BIO_GETS, BIO_R_UNINITIALIZED);
 455         return -2;
 456     }
 457
 458     ret = b->method->bgets(b, buf, size);
 459
 460     if (ret > 0) {
 461         readbytes = ret;
 462         ret = 1;
 463     }
 464
 465     if (b->callback != NULL || b->callback_ex != NULL)
 466         ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
 467                                      0, 0L, ret, &readbytes);
 468
 469     if (ret > 0) {
 470         /* Shouldn't happen */
 471         if (readbytes > (size_t)size)
 472             ret = -1;
 473         else
 474             ret = (int)readbytes;
 475     }
 476
 477     return ret;
 478 }
 479
 480 int BIO_indent(BIO *b, int indent, int max)
 481 {
 482     if (indent < 0)
 483         indent = 0;
 484     if (indent > max)
 485         indent = max;
 486     while (indent--)
 487         if (BIO_puts(b, " ") != 1)
 488             return 0;
 489     return 1;
 490 }
 491
 492 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
 493 {
 494     int i;
 495
 496     i = iarg;
 497     return BIO_ctrl(b, cmd, larg, (char *)&i);
 498 }
 499
 500 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
 501 {
 502     void *p = NULL;
 503
 504     if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
 505         return NULL;
 506     else
 507         return p;
 508 }
 509
 510 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
 511 {
 512     long ret;
 513
 514     if (b == NULL)
 515         return 0;
 516
 517     if ((b->method == NULL) || (b->method->ctrl == NULL)) {
 518         BIOerr(BIO_F_BIO_CTRL, BIO_R_UNSUPPORTED_METHOD);
 519         return -2;
 520     }
 521
 522     if (b->callback != NULL || b->callback_ex != NULL) {
 523         ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
 524         if (ret <= 0)
 525             return ret;
 526     }
 527
 528     ret = b->method->ctrl(b, cmd, larg, parg);
 529
 530     if (b->callback != NULL || b->callback_ex != NULL)
 531         ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
 532                                 larg, ret, NULL);
 533
 534     return ret;
 535 }
 536
 537 long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
 538 {
 539     long ret;
 540
 541     if (b == NULL)
 542         return 0;
 543
 544     if ((b->method == NULL) || (b->method->callback_ctrl == NULL)
 545             || (cmd != BIO_CTRL_SET_CALLBACK)) {
 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 }
 787
 788 /* Internal variant of the below BIO_wait() not calling BIOerr() */
 789 static int bio_wait(BIO *bio, time_t max_time, unsigned int milliseconds)
 790 {
 791     int fd;
 792
 793     if (max_time == 0)
 794         return 1;
 795
 796 #ifndef OPENSSL_NO_SOCK
 797     if (BIO_get_fd(bio, &fd) > 0)
 798         return BIO_socket_wait(fd, BIO_should_read(bio), max_time);
 799 #endif
 800     if (milliseconds > 1000) {
 801         long sec_diff = (long)(max_time - time(NULL)); /* might overflow */
 802
 803         if (sec_diff <= 0)
 804             return 0; /* timeout */
 805         if ((unsigned long)sec_diff < milliseconds / 1000)
 806             milliseconds = (unsigned long)sec_diff * 1000;
 807     }
 808     ossl_sleep(milliseconds);
 809     return 1;
 810 }
 811
 812 /*
 813  * Wait on (typically socket-based) BIO at most until max_time.
 814  * Succeed immediately if max_time == 0. If sockets are not available succeed
 815  * after waiting at most given milliseconds in order to avoid a tight busy loop.
 816  * Call BIOerr(...) unless success.
 817  * Returns -1 on error, 0 on timeout, and 1 on success.
 818  */
 819 int BIO_wait(BIO *bio, time_t max_time, unsigned int milliseconds)
 820 {
 821     int rv = bio_wait(bio, max_time, milliseconds);
 822
 823     if (rv <= 0)
 824         BIOerr(0, rv == 0 ? BIO_R_TRANSFER_TIMEOUT : BIO_R_TRANSFER_ERROR);
 825     return rv;
 826 }
 827
 828 /*
 829  * Connect via given BIO using BIO_do_handshake() until success/timeout/error.
 830  * Parameter timeout == 0 means infinite, < 0 leads to immediate timeout error.
 831  * Returns -1 on error, 0 on timeout, and 1 on success.
 832  */
 833 int BIO_connect_retry(BIO *bio, int timeout)
 834 {
 835     int blocking = timeout == 0;
 836     time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
 837     int rv;
 838
 839     if (bio == NULL) {
 840         BIOerr(0, ERR_R_PASSED_NULL_PARAMETER);
 841         return -1;
 842     }
 843
 844     if (timeout < 0) {
 845         BIOerr(0, BIO_R_CONNECT_TIMEOUT);
 846         return 0;
 847     }
 848
 849     if (!blocking)
 850         BIO_set_nbio(bio, 1);
 851
 852  retry: /* it does not help here to set SSL_MODE_AUTO_RETRY */
 853     rv = BIO_do_handshake(bio); /* This indirectly calls ERR_clear_error(); */
 854
 855     if (rv <= 0) {
 856         if (get_last_sys_error() == ETIMEDOUT) {
 857             /*
 858              * if blocking, despite blocking BIO, BIO_do_handshake() timed out
 859              * when non-blocking, BIO_do_handshake() timed out early
 860              * with rv == -1 and get_last_sys_error() == 0
 861              */
 862             ERR_clear_error();
 863             (void)BIO_reset(bio);
 864             /*
 865              * unless using BIO_reset(), blocking next connect() may crash and
 866              * non-blocking next BIO_do_handshake() will fail
 867              */
 868             goto retry;
 869         } else if (BIO_should_retry(bio)) {
 870             /* will not actually wait if timeout == 0 (i.e., blocking BIO) */
 871             rv = bio_wait(bio, max_time, 100 /* milliseconds */);
 872             if (rv > 0)
 873                 goto retry;
 874             BIOerr(0, rv == 0 ? BIO_R_CONNECT_TIMEOUT : BIO_R_CONNECT_ERROR);
 875         } else {
 876             rv = -1;
 877             if (ERR_peek_error() == 0) /* missing error queue entry */
 878                 BIOerr(0, BIO_R_CONNECT_ERROR); /* workaround: general error */
 879         }
 880     }
 881
 882     return rv;
 883 }