crypto/bio/bio_lib.c

   1 /*
   2  * Copyright 1995-2021 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 #define OPENSSL_SUPPRESS_DEPRECATED
  11
  12 #include <stdio.h>
  13 #include <errno.h>
  14 #include <openssl/crypto.h>
  15 #include "bio_local.h"
  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 #ifndef OPENSSL_NO_DEPRECATED_3_0
  25 # define HAS_CALLBACK(b) ((b)->callback != NULL || (b)->callback_ex != NULL)
  26 #else
  27 # define HAS_CALLBACK(b) ((b)->callback_ex != NULL)
  28 #endif
  29 /*
  30  * Helper function to work out whether to call the new style callback or the old
  31  * one, and translate between the two.
  32  *
  33  * This has a long return type for consistency with the old callback. Similarly
  34  * for the "long" used for "inret"
  35  */
  36 static long bio_call_callback(BIO *b, int oper, const char *argp, size_t len,
  37                               int argi, long argl, long inret,
  38                               size_t *processed)
  39 {
  40     long ret = inret;
  41 #ifndef OPENSSL_NO_DEPRECATED_3_0
  42     int bareoper;
  43
  44     if (b->callback_ex != NULL)
  45 #endif
  46         return b->callback_ex(b, oper, argp, len, argi, argl, inret, processed);
  47
  48 #ifndef OPENSSL_NO_DEPRECATED_3_0
  49     /* Strip off any BIO_CB_RETURN flag */
  50     bareoper = oper & ~BIO_CB_RETURN;
  51
  52     /*
  53      * We have an old style callback, so we will have to do nasty casts and
  54      * check for overflows.
  55      */
  56     if (HAS_LEN_OPER(bareoper)) {
  57         /* In this case |len| is set, and should be used instead of |argi| */
  58         if (len > INT_MAX)
  59             return -1;
  60
  61         argi = (int)len;
  62     }
  63
  64     if (inret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
  65         if (*processed > INT_MAX)
  66             return -1;
  67         inret = *processed;
  68     }
  69
  70     ret = b->callback(b, oper, argp, argi, argl, inret);
  71
  72     if (ret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
  73         *processed = (size_t)ret;
  74         ret = 1;
  75     }
  76 #endif
  77     return ret;
  78 }
  79
  80 BIO *BIO_new_ex(OSSL_LIB_CTX *libctx, const BIO_METHOD *method)
  81 {
  82     BIO *bio = OPENSSL_zalloc(sizeof(*bio));
  83
  84     if (bio == NULL) {
  85         ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
  86         return NULL;
  87     }
  88
  89     bio->libctx = libctx;
  90     bio->method = method;
  91     bio->shutdown = 1;
  92     bio->references = 1;
  93
  94     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data))
  95         goto err;
  96
  97     bio->lock = CRYPTO_THREAD_lock_new();
  98     if (bio->lock == NULL) {
  99         ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 100         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
 101         goto err;
 102     }
 103
 104     if (method->create != NULL && !method->create(bio)) {
 105         ERR_raise(ERR_LIB_BIO, ERR_R_INIT_FAIL);
 106         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
 107         CRYPTO_THREAD_lock_free(bio->lock);
 108         goto err;
 109     }
 110     if (method->create == NULL)
 111         bio->init = 1;
 112
 113     return bio;
 114
 115 err:
 116     OPENSSL_free(bio);
 117     return NULL;
 118 }
 119
 120 BIO *BIO_new(const BIO_METHOD *method)
 121 {
 122     return BIO_new_ex(NULL, method);
 123 }
 124
 125 int BIO_free(BIO *a)
 126 {
 127     int ret;
 128
 129     if (a == NULL)
 130         return 0;
 131
 132     if (CRYPTO_DOWN_REF(&a->references, &ret, a->lock) <= 0)
 133         return 0;
 134
 135     REF_PRINT_COUNT("BIO", a);
 136     if (ret > 0)
 137         return 1;
 138     REF_ASSERT_ISNT(ret < 0);
 139
 140     if (HAS_CALLBACK(a)) {
 141         ret = (int)bio_call_callback(a, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL);
 142         if (ret <= 0)
 143             return ret;
 144     }
 145
 146     if ((a->method != NULL) && (a->method->destroy != NULL))
 147         a->method->destroy(a);
 148
 149     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
 150
 151     CRYPTO_THREAD_lock_free(a->lock);
 152
 153     OPENSSL_free(a);
 154
 155     return 1;
 156 }
 157
 158 void BIO_set_data(BIO *a, void *ptr)
 159 {
 160     a->ptr = ptr;
 161 }
 162
 163 void *BIO_get_data(BIO *a)
 164 {
 165     return a->ptr;
 166 }
 167
 168 void BIO_set_init(BIO *a, int init)
 169 {
 170     a->init = init;
 171 }
 172
 173 int BIO_get_init(BIO *a)
 174 {
 175     return a->init;
 176 }
 177
 178 void BIO_set_shutdown(BIO *a, int shut)
 179 {
 180     a->shutdown = shut;
 181 }
 182
 183 int BIO_get_shutdown(BIO *a)
 184 {
 185     return a->shutdown;
 186 }
 187
 188 void BIO_vfree(BIO *a)
 189 {
 190     BIO_free(a);
 191 }
 192
 193 int BIO_up_ref(BIO *a)
 194 {
 195     int i;
 196
 197     if (CRYPTO_UP_REF(&a->references, &i, a->lock) <= 0)
 198         return 0;
 199
 200     REF_PRINT_COUNT("BIO", a);
 201     REF_ASSERT_ISNT(i < 2);
 202     return i > 1;
 203 }
 204
 205 void BIO_clear_flags(BIO *b, int flags)
 206 {
 207     b->flags &= ~flags;
 208 }
 209
 210 int BIO_test_flags(const BIO *b, int flags)
 211 {
 212     return (b->flags & flags);
 213 }
 214
 215 void BIO_set_flags(BIO *b, int flags)
 216 {
 217     b->flags |= flags;
 218 }
 219
 220 #ifndef OPENSSL_NO_DEPRECATED_3_0
 221 BIO_callback_fn BIO_get_callback(const BIO *b)
 222 {
 223     return b->callback;
 224 }
 225
 226 void BIO_set_callback(BIO *b, BIO_callback_fn cb)
 227 {
 228     b->callback = cb;
 229 }
 230 #endif
 231
 232 BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b)
 233 {
 234     return b->callback_ex;
 235 }
 236
 237 void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex cb)
 238 {
 239     b->callback_ex = cb;
 240 }
 241
 242 void BIO_set_callback_arg(BIO *b, char *arg)
 243 {
 244     b->cb_arg = arg;
 245 }
 246
 247 char *BIO_get_callback_arg(const BIO *b)
 248 {
 249     return b->cb_arg;
 250 }
 251
 252 const char *BIO_method_name(const BIO *b)
 253 {
 254     return b->method->name;
 255 }
 256
 257 int BIO_method_type(const BIO *b)
 258 {
 259     return b->method->type;
 260 }
 261
 262 /*
 263  * This is essentially the same as BIO_read_ex() except that it allows
 264  * 0 or a negative value to indicate failure (retryable or not) in the return.
 265  * This is for compatibility with the old style BIO_read(), where existing code
 266  * may make assumptions about the return value that it might get.
 267  */
 268 static int bio_read_intern(BIO *b, void *data, size_t dlen, size_t *readbytes)
 269 {
 270     int ret;
 271
 272     if (b == NULL) {
 273         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 274         return -1;
 275     }
 276     if (b->method == NULL || b->method->bread == NULL) {
 277         ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
 278         return -2;
 279     }
 280
 281     if (HAS_CALLBACK(b) &&
 282         ((ret = (int)bio_call_callback(b, BIO_CB_READ, data, dlen, 0, 0L, 1L,
 283                                        NULL)) <= 0))
 284         return ret;
 285
 286     if (!b->init) {
 287         ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
 288         return -1;
 289     }
 290
 291     ret = b->method->bread(b, data, dlen, readbytes);
 292
 293     if (ret > 0)
 294         b->num_read += (uint64_t)*readbytes;
 295
 296     if (HAS_CALLBACK(b))
 297         ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, data,
 298                                      dlen, 0, 0L, ret, readbytes);
 299
 300     /* Shouldn't happen */
 301     if (ret > 0 && *readbytes > dlen) {
 302         ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
 303         return -1;
 304     }
 305
 306     return ret;
 307 }
 308
 309 int BIO_read(BIO *b, void *data, int dlen)
 310 {
 311     size_t readbytes;
 312     int ret;
 313
 314     if (dlen < 0)
 315         return 0;
 316
 317     ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
 318
 319     if (ret > 0) {
 320         /* *readbytes should always be <= dlen */
 321         ret = (int)readbytes;
 322     }
 323
 324     return ret;
 325 }
 326
 327 int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes)
 328 {
 329     return bio_read_intern(b, data, dlen, readbytes) > 0;
 330 }
 331
 332 static int bio_write_intern(BIO *b, const void *data, size_t dlen,
 333                             size_t *written)
 334 {
 335     int ret;
 336
 337     if (b == NULL) {
 338         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 339         return -1;
 340     }
 341     if (b->method == NULL || b->method->bwrite == NULL) {
 342         ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
 343         return -2;
 344     }
 345
 346     if (HAS_CALLBACK(b) &&
 347         ((ret = (int)bio_call_callback(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L,
 348                                        NULL)) <= 0))
 349         return ret;
 350
 351     if (!b->init) {
 352         ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
 353         return -1;
 354     }
 355
 356     ret = b->method->bwrite(b, data, dlen, written);
 357
 358     if (ret > 0)
 359         b->num_write += (uint64_t)*written;
 360
 361     if (HAS_CALLBACK(b))
 362         ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, data,
 363                                      dlen, 0, 0L, ret, written);
 364
 365     return ret;
 366 }
 367
 368 int BIO_write(BIO *b, const void *data, int dlen)
 369 {
 370     size_t written;
 371     int ret;
 372
 373     if (dlen < 0)
 374         return 0;
 375
 376     ret = bio_write_intern(b, data, (size_t)dlen, &written);
 377
 378     if (ret > 0) {
 379         /* *written should always be <= dlen */
 380         ret = (int)written;
 381     }
 382
 383     return ret;
 384 }
 385
 386 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
 387 {
 388     return bio_write_intern(b, data, dlen, written) > 0;
 389 }
 390
 391 int BIO_puts(BIO *b, const char *buf)
 392 {
 393     int ret;
 394     size_t written = 0;
 395
 396     if (b == NULL) {
 397         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 398         return -1;
 399     }
 400     if (b->method == NULL || b->method->bputs == NULL) {
 401         ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
 402         return -2;
 403     }
 404
 405     if (HAS_CALLBACK(b)) {
 406         ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
 407         if (ret <= 0)
 408             return ret;
 409     }
 410
 411     if (!b->init) {
 412         ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
 413         return -1;
 414     }
 415
 416     ret = b->method->bputs(b, buf);
 417
 418     if (ret > 0) {
 419         b->num_write += (uint64_t)ret;
 420         written = ret;
 421         ret = 1;
 422     }
 423
 424     if (HAS_CALLBACK(b))
 425         ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
 426                                      0L, ret, &written);
 427
 428     if (ret > 0) {
 429         if (written > INT_MAX) {
 430             ERR_raise(ERR_LIB_BIO, BIO_R_LENGTH_TOO_LONG);
 431             ret = -1;
 432         } else {
 433             ret = (int)written;
 434         }
 435     }
 436
 437     return ret;
 438 }
 439
 440 int BIO_gets(BIO *b, char *buf, int size)
 441 {
 442     int ret;
 443     size_t readbytes = 0;
 444
 445     if (b == NULL) {
 446         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 447         return -1;
 448     }
 449     if (b->method == NULL || b->method->bgets == NULL) {
 450         ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
 451         return -2;
 452     }
 453
 454     if (size < 0) {
 455         ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_ARGUMENT);
 456         return -1;
 457     }
 458
 459     if (HAS_CALLBACK(b)) {
 460         ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
 461         if (ret <= 0)
 462             return ret;
 463     }
 464
 465     if (!b->init) {
 466         ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
 467         return -1;
 468     }
 469
 470     ret = b->method->bgets(b, buf, size);
 471
 472     if (ret > 0) {
 473         readbytes = ret;
 474         ret = 1;
 475     }
 476
 477     if (HAS_CALLBACK(b))
 478         ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
 479                                      0, 0L, ret, &readbytes);
 480
 481     if (ret > 0) {
 482         /* Shouldn't happen */
 483         if (readbytes > (size_t)size)
 484             ret = -1;
 485         else
 486             ret = (int)readbytes;
 487     }
 488
 489     return ret;
 490 }
 491
 492 int BIO_get_line(BIO *bio, char *buf, int size)
 493 {
 494     int ret = 0;
 495     char *ptr = buf;
 496
 497     if (buf == NULL) {
 498         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 499         return -1;
 500     }
 501     if (size <= 0) {
 502         ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_ARGUMENT);
 503         return -1;
 504     }
 505     *buf = '\0';
 506
 507     if (bio == NULL) {
 508         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 509         return -1;
 510     }
 511     if (!bio->init) {
 512         ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
 513         return -1;
 514     }
 515
 516     while (size-- > 1 && (ret = BIO_read(bio, ptr, 1)) > 0)
 517         if (*ptr++ == '\n')
 518             break;
 519     *ptr = '\0';
 520     return ret > 0 || BIO_eof(bio) ? ptr - buf : ret;
 521 }
 522
 523 int BIO_indent(BIO *b, int indent, int max)
 524 {
 525     if (indent < 0)
 526         indent = 0;
 527     if (indent > max)
 528         indent = max;
 529     while (indent--)
 530         if (BIO_puts(b, " ") != 1)
 531             return 0;
 532     return 1;
 533 }
 534
 535 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
 536 {
 537     int i;
 538
 539     i = iarg;
 540     return BIO_ctrl(b, cmd, larg, (char *)&i);
 541 }
 542
 543 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
 544 {
 545     void *p = NULL;
 546
 547     if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
 548         return NULL;
 549     else
 550         return p;
 551 }
 552
 553 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
 554 {
 555     long ret;
 556
 557     if (b == NULL) {
 558         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 559         return -1;
 560     }
 561     if (b->method == NULL || b->method->ctrl == NULL) {
 562         ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
 563         return -2;
 564     }
 565
 566     if (HAS_CALLBACK(b)) {
 567         ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
 568         if (ret <= 0)
 569             return ret;
 570     }
 571
 572     ret = b->method->ctrl(b, cmd, larg, parg);
 573
 574     if (HAS_CALLBACK(b))
 575         ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
 576                                 larg, ret, NULL);
 577
 578     return ret;
 579 }
 580
 581 long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
 582 {
 583     long ret;
 584
 585     if (b == NULL) {
 586         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 587         return -2;
 588     }
 589     if (b->method == NULL || b->method->callback_ctrl == NULL
 590             || cmd != BIO_CTRL_SET_CALLBACK) {
 591         ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
 592         return -2;
 593     }
 594
 595     if (HAS_CALLBACK(b)) {
 596         ret = bio_call_callback(b, BIO_CB_CTRL, (void *)&fp, 0, cmd, 0, 1L,
 597                                 NULL);
 598         if (ret <= 0)
 599             return ret;
 600     }
 601
 602     ret = b->method->callback_ctrl(b, cmd, fp);
 603
 604     if (HAS_CALLBACK(b))
 605         ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, 0,
 606                                 cmd, 0, ret, NULL);
 607
 608     return ret;
 609 }
 610
 611 /*
 612  * It is unfortunate to duplicate in functions what the BIO_(w)pending macros
 613  * do; but those macros have inappropriate return type, and for interfacing
 614  * from other programming languages, C macros aren't much of a help anyway.
 615  */
 616 size_t BIO_ctrl_pending(BIO *bio)
 617 {
 618     return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);
 619 }
 620
 621 size_t BIO_ctrl_wpending(BIO *bio)
 622 {
 623     return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);
 624 }
 625
 626 /* put the 'bio' on the end of b's list of operators */
 627 BIO *BIO_push(BIO *b, BIO *bio)
 628 {
 629     BIO *lb;
 630
 631     if (b == NULL)
 632         return bio;
 633     lb = b;
 634     while (lb->next_bio != NULL)
 635         lb = lb->next_bio;
 636     lb->next_bio = bio;
 637     if (bio != NULL)
 638         bio->prev_bio = lb;
 639     /* called to do internal processing */
 640     BIO_ctrl(b, BIO_CTRL_PUSH, 0, lb);
 641     return b;
 642 }
 643
 644 /* Remove the first and return the rest */
 645 BIO *BIO_pop(BIO *b)
 646 {
 647     BIO *ret;
 648
 649     if (b == NULL) {
 650         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 651         return NULL;
 652     }
 653     ret = b->next_bio;
 654
 655     BIO_ctrl(b, BIO_CTRL_POP, 0, b);
 656
 657     if (b->prev_bio != NULL)
 658         b->prev_bio->next_bio = b->next_bio;
 659     if (b->next_bio != NULL)
 660         b->next_bio->prev_bio = b->prev_bio;
 661
 662     b->next_bio = NULL;
 663     b->prev_bio = NULL;
 664     return ret;
 665 }
 666
 667 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
 668 {
 669     BIO *b, *last;
 670
 671     b = last = bio;
 672     for (;;) {
 673         if (!BIO_should_retry(b))
 674             break;
 675         last = b;
 676         b = b->next_bio;
 677         if (b == NULL)
 678             break;
 679     }
 680     if (reason != NULL)
 681         *reason = last->retry_reason;
 682     return last;
 683 }
 684
 685 int BIO_get_retry_reason(BIO *bio)
 686 {
 687     return bio->retry_reason;
 688 }
 689
 690 void BIO_set_retry_reason(BIO *bio, int reason)
 691 {
 692     bio->retry_reason = reason;
 693 }
 694
 695 BIO *BIO_find_type(BIO *bio, int type)
 696 {
 697     int mt, mask;
 698
 699     if (bio == NULL) {
 700         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 701         return NULL;
 702     }
 703     mask = type & 0xff;
 704     do {
 705         if (bio->method != NULL) {
 706             mt = bio->method->type;
 707
 708             if (!mask) {
 709                 if (mt & type)
 710                     return bio;
 711             } else if (mt == type) {
 712                 return bio;
 713             }
 714         }
 715         bio = bio->next_bio;
 716     } while (bio != NULL);
 717     return NULL;
 718 }
 719
 720 BIO *BIO_next(BIO *b)
 721 {
 722     if (b == NULL) {
 723         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 724         return NULL;
 725     }
 726     return b->next_bio;
 727 }
 728
 729 void BIO_set_next(BIO *b, BIO *next)
 730 {
 731     b->next_bio = next;
 732 }
 733
 734 void BIO_free_all(BIO *bio)
 735 {
 736     BIO *b;
 737     int ref;
 738
 739     while (bio != NULL) {
 740         b = bio;
 741         ref = b->references;
 742         bio = bio->next_bio;
 743         BIO_free(b);
 744         /* Since ref count > 1, don't free anyone else. */
 745         if (ref > 1)
 746             break;
 747     }
 748 }
 749
 750 BIO *BIO_dup_chain(BIO *in)
 751 {
 752     BIO *ret = NULL, *eoc = NULL, *bio, *new_bio;
 753
 754     for (bio = in; bio != NULL; bio = bio->next_bio) {
 755         if ((new_bio = BIO_new(bio->method)) == NULL)
 756             goto err;
 757 #ifndef OPENSSL_NO_DEPRECATED_3_0
 758         new_bio->callback = bio->callback;
 759 #endif
 760         new_bio->callback_ex = bio->callback_ex;
 761         new_bio->cb_arg = bio->cb_arg;
 762         new_bio->init = bio->init;
 763         new_bio->shutdown = bio->shutdown;
 764         new_bio->flags = bio->flags;
 765
 766         /* This will let SSL_s_sock() work with stdin/stdout */
 767         new_bio->num = bio->num;
 768
 769         if (!BIO_dup_state(bio, (char *)new_bio)) {
 770             BIO_free(new_bio);
 771             goto err;
 772         }
 773
 774         /* copy app data */
 775         if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new_bio->ex_data,
 776                                 &bio->ex_data)) {
 777             BIO_free(new_bio);
 778             goto err;
 779         }
 780
 781         if (ret == NULL) {
 782             eoc = new_bio;
 783             ret = eoc;
 784         } else {
 785             BIO_push(eoc, new_bio);
 786             eoc = new_bio;
 787         }
 788     }
 789     return ret;
 790  err:
 791     BIO_free_all(ret);
 792
 793     return NULL;
 794 }
 795
 796 void BIO_copy_next_retry(BIO *b)
 797 {
 798     BIO_set_flags(b, BIO_get_retry_flags(b->next_bio));
 799     b->retry_reason = b->next_bio->retry_reason;
 800 }
 801
 802 int BIO_set_ex_data(BIO *bio, int idx, void *data)
 803 {
 804     return CRYPTO_set_ex_data(&(bio->ex_data), idx, data);
 805 }
 806
 807 void *BIO_get_ex_data(const BIO *bio, int idx)
 808 {
 809     return CRYPTO_get_ex_data(&(bio->ex_data), idx);
 810 }
 811
 812 uint64_t BIO_number_read(BIO *bio)
 813 {
 814     if (bio)
 815         return bio->num_read;
 816     return 0;
 817 }
 818
 819 uint64_t BIO_number_written(BIO *bio)
 820 {
 821     if (bio)
 822         return bio->num_write;
 823     return 0;
 824 }
 825
 826 void bio_free_ex_data(BIO *bio)
 827 {
 828     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
 829 }
 830
 831 void bio_cleanup(void)
 832 {
 833 #ifndef OPENSSL_NO_SOCK
 834     bio_sock_cleanup_int();
 835     CRYPTO_THREAD_lock_free(bio_lookup_lock);
 836     bio_lookup_lock = NULL;
 837 #endif
 838     CRYPTO_THREAD_lock_free(bio_type_lock);
 839     bio_type_lock = NULL;
 840 }
 841
 842 /* Internal variant of the below BIO_wait() not calling BIOerr() */
 843 static int bio_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
 844 {
 845 #ifndef OPENSSL_NO_SOCK
 846     int fd;
 847 #endif
 848     long sec_diff;
 849
 850     if (max_time == 0) /* no timeout */
 851         return 1;
 852
 853 #ifndef OPENSSL_NO_SOCK
 854     if (BIO_get_fd(bio, &fd) > 0 && fd < FD_SETSIZE)
 855         return BIO_socket_wait(fd, BIO_should_read(bio), max_time);
 856 #endif
 857     /* fall back to polling since no sockets are available */
 858
 859     sec_diff = (long)(max_time - time(NULL)); /* might overflow */
 860     if (sec_diff < 0)
 861         return 0; /* clearly timeout */
 862
 863     /* now take a nap at most the given number of milliseconds */
 864     if (sec_diff == 0) { /* we are below the 1 seconds resolution of max_time */
 865         if (nap_milliseconds > 1000)
 866             nap_milliseconds = 1000;
 867     } else { /* for sec_diff > 0, take min(sec_diff * 1000, nap_milliseconds) */
 868         if ((unsigned long)sec_diff * 1000 < nap_milliseconds)
 869             nap_milliseconds = (unsigned int)sec_diff * 1000;
 870     }
 871     ossl_sleep(nap_milliseconds);
 872     return 1;
 873 }
 874
 875 /*-
 876  * Wait on (typically socket-based) BIO at most until max_time.
 877  * Succeed immediately if max_time == 0.
 878  * If sockets are not available support polling: succeed after waiting at most
 879  * the number of nap_milliseconds in order to avoid a tight busy loop.
 880  * Call BIOerr(...) on timeout or error.
 881  * Returns -1 on error, 0 on timeout, and 1 on success.
 882  */
 883 int BIO_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
 884 {
 885     int rv = bio_wait(bio, max_time, nap_milliseconds);
 886
 887     if (rv <= 0)
 888         ERR_raise(ERR_LIB_BIO,
 889                   rv == 0 ? BIO_R_TRANSFER_TIMEOUT : BIO_R_TRANSFER_ERROR);
 890     return rv;
 891 }
 892
 893 /*
 894  * Connect via given BIO using BIO_do_connect() until success/timeout/error.
 895  * Parameter timeout == 0 means no timeout, < 0 means exactly one try.
 896  * For non-blocking and potentially even non-socket BIOs perform polling with
 897  * the given density: between polls sleep nap_milliseconds using BIO_wait()
 898  * in order to avoid a tight busy loop.
 899  * Returns -1 on error, 0 on timeout, and 1 on success.
 900  */
 901 int BIO_do_connect_retry(BIO *bio, int timeout, int nap_milliseconds)
 902 {
 903     int blocking = timeout <= 0;
 904     time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
 905     int rv;
 906
 907     if (bio == NULL) {
 908         ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
 909         return -1;
 910     }
 911
 912     if (nap_milliseconds < 0)
 913         nap_milliseconds = 100;
 914     BIO_set_nbio(bio, !blocking);
 915
 916  retry:
 917     ERR_set_mark();
 918     rv = BIO_do_connect(bio);
 919
 920     if (rv <= 0) { /* could be timeout or retryable error or fatal error */
 921         int err = ERR_peek_last_error();
 922         int reason = ERR_GET_REASON(err);
 923         int do_retry = BIO_should_retry(bio); /* may be 1 only if !blocking */
 924
 925         if (ERR_GET_LIB(err) == ERR_LIB_BIO) {
 926             switch (reason) {
 927             case ERR_R_SYS_LIB:
 928                 /*
 929                  * likely retryable system error occurred, which may be
 930                  * EAGAIN (resource temporarily unavailable) some 40 secs after
 931                  * calling getaddrinfo(): Temporary failure in name resolution
 932                  * or a premature ETIMEDOUT, some 30 seconds after connect()
 933                  */
 934             case BIO_R_CONNECT_ERROR:
 935             case BIO_R_NBIO_CONNECT_ERROR:
 936                 /* some likely retryable connection error occurred */
 937                 (void)BIO_reset(bio); /* often needed to avoid retry failure */
 938                 do_retry = 1;
 939                 break;
 940             default:
 941                 break;
 942             }
 943         }
 944         if (timeout >= 0 && do_retry) {
 945             ERR_pop_to_mark();
 946             /* will not actually wait if timeout == 0 (i.e., blocking BIO): */
 947             rv = bio_wait(bio, max_time, nap_milliseconds);
 948             if (rv > 0)
 949                 goto retry;
 950             ERR_raise(ERR_LIB_BIO,
 951                       rv == 0 ? BIO_R_CONNECT_TIMEOUT : BIO_R_CONNECT_ERROR);
 952         } else {
 953             ERR_clear_last_mark();
 954             rv = -1;
 955             if (err == 0) /* missing error queue entry */
 956                 /* workaround: general error */
 957                 ERR_raise(ERR_LIB_BIO, BIO_R_CONNECT_ERROR);
 958         }
 959     } else {
 960         ERR_clear_last_mark();
 961     }
 962
 963     return rv;
 964 }