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 BIO *BIO_new(const BIO_METHOD *method)
  17 {
  18     BIO *bio = OPENSSL_zalloc(sizeof(*bio));
  19
  20     if (bio == NULL) {
  21         BIOerr(BIO_F_BIO_NEW, ERR_R_MALLOC_FAILURE);
  22         return (NULL);
  23     }
  24
  25     bio->method = method;
  26     bio->shutdown = 1;
  27     bio->references = 1;
  28
  29     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data))
  30         goto err;
  31
  32     bio->lock = CRYPTO_THREAD_lock_new();
  33     if (bio->lock == NULL) {
  34         BIOerr(BIO_F_BIO_NEW, ERR_R_MALLOC_FAILURE);
  35         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
  36         goto err;
  37     }
  38
  39     if (method->create != NULL && !method->create(bio)) {
  40         BIOerr(BIO_F_BIO_NEW, ERR_R_INIT_FAIL);
  41         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
  42         CRYPTO_THREAD_lock_free(bio->lock);
  43         goto err;
  44     }
  45
  46     return bio;
  47
  48 err:
  49     OPENSSL_free(bio);
  50     return NULL;
  51 }
  52
  53 int BIO_free(BIO *a)
  54 {
  55     int i;
  56
  57     if (a == NULL)
  58         return 0;
  59
  60     if (CRYPTO_atomic_add(&a->references, -1, &i, a->lock) <= 0)
  61         return 0;
  62
  63     REF_PRINT_COUNT("BIO", a);
  64     if (i > 0)
  65         return 1;
  66     REF_ASSERT_ISNT(i < 0);
  67     if ((a->callback != NULL) &&
  68         ((i = (int)a->callback(a, BIO_CB_FREE, NULL, 0, 0L, 1L)) <= 0))
  69         return i;
  70
  71     if ((a->method != NULL) && (a->method->destroy != NULL))
  72         a->method->destroy(a);
  73
  74     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
  75
  76     CRYPTO_THREAD_lock_free(a->lock);
  77
  78     OPENSSL_free(a);
  79
  80     return 1;
  81 }
  82
  83 void BIO_set_data(BIO *a, void *ptr)
  84 {
  85     a->ptr = ptr;
  86 }
  87
  88 void *BIO_get_data(BIO *a)
  89 {
  90     return a->ptr;
  91 }
  92
  93 void BIO_set_init(BIO *a, int init)
  94 {
  95     a->init = init;
  96 }
  97
  98 int BIO_get_init(BIO *a)
  99 {
 100     return a->init;
 101 }
 102
 103 void BIO_set_shutdown(BIO *a, int shut)
 104 {
 105     a->shutdown = shut;
 106 }
 107
 108 int BIO_get_shutdown(BIO *a)
 109 {
 110     return a->shutdown;
 111 }
 112
 113 void BIO_vfree(BIO *a)
 114 {
 115     BIO_free(a);
 116 }
 117
 118 int BIO_up_ref(BIO *a)
 119 {
 120     int i;
 121
 122     if (CRYPTO_atomic_add(&a->references, 1, &i, a->lock) <= 0)
 123         return 0;
 124
 125     REF_PRINT_COUNT("BIO", a);
 126     REF_ASSERT_ISNT(i < 2);
 127     return ((i > 1) ? 1 : 0);
 128 }
 129
 130 void BIO_clear_flags(BIO *b, int flags)
 131 {
 132     b->flags &= ~flags;
 133 }
 134
 135 int BIO_test_flags(const BIO *b, int flags)
 136 {
 137     return (b->flags & flags);
 138 }
 139
 140 void BIO_set_flags(BIO *b, int flags)
 141 {
 142     b->flags |= flags;
 143 }
 144
 145 long (*BIO_get_callback(const BIO *b)) (struct bio_st *, int, const char *,
 146                                         int, long, long) {
 147     return b->callback;
 148 }
 149
 150 void BIO_set_callback(BIO *b,
 151                       long (*cb) (struct bio_st *, int, const char *, int,
 152                                   long, long))
 153 {
 154     b->callback = cb;
 155 }
 156
 157 void BIO_set_callback_arg(BIO *b, char *arg)
 158 {
 159     b->cb_arg = arg;
 160 }
 161
 162 char *BIO_get_callback_arg(const BIO *b)
 163 {
 164     return b->cb_arg;
 165 }
 166
 167 const char *BIO_method_name(const BIO *b)
 168 {
 169     return b->method->name;
 170 }
 171
 172 int BIO_method_type(const BIO *b)
 173 {
 174     return b->method->type;
 175 }
 176
 177 int BIO_read(BIO *b, void *out, int outl)
 178 {
 179     int i;
 180     long (*cb) (BIO *, int, const char *, int, long, long);
 181
 182     if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL)) {
 183         BIOerr(BIO_F_BIO_READ, BIO_R_UNSUPPORTED_METHOD);
 184         return (-2);
 185     }
 186
 187     cb = b->callback;
 188     if ((cb != NULL) &&
 189         ((i = (int)cb(b, BIO_CB_READ, out, outl, 0L, 1L)) <= 0))
 190         return (i);
 191
 192     if (!b->init) {
 193         BIOerr(BIO_F_BIO_READ, BIO_R_UNINITIALIZED);
 194         return (-2);
 195     }
 196
 197     i = b->method->bread(b, out, outl);
 198
 199     if (i > 0)
 200         b->num_read += (uint64_t)i;
 201
 202     if (cb != NULL)
 203         i = (int)cb(b, BIO_CB_READ | BIO_CB_RETURN, out, outl, 0L, (long)i);
 204     return (i);
 205 }
 206
 207 int BIO_write(BIO *b, const void *in, int inl)
 208 {
 209     int i;
 210     long (*cb) (BIO *, int, const char *, int, long, long);
 211
 212     if (b == NULL)
 213         return (0);
 214
 215     cb = b->callback;
 216     if ((b->method == NULL) || (b->method->bwrite == NULL)) {
 217         BIOerr(BIO_F_BIO_WRITE, BIO_R_UNSUPPORTED_METHOD);
 218         return (-2);
 219     }
 220
 221     if ((cb != NULL) &&
 222         ((i = (int)cb(b, BIO_CB_WRITE, in, inl, 0L, 1L)) <= 0))
 223         return (i);
 224
 225     if (!b->init) {
 226         BIOerr(BIO_F_BIO_WRITE, BIO_R_UNINITIALIZED);
 227         return (-2);
 228     }
 229
 230     i = b->method->bwrite(b, in, inl);
 231
 232     if (i > 0)
 233         b->num_write += (uint64_t)i;
 234
 235     if (cb != NULL)
 236         i = (int)cb(b, BIO_CB_WRITE | BIO_CB_RETURN, in, inl, 0L, (long)i);
 237     return (i);
 238 }
 239
 240 int BIO_puts(BIO *b, const char *in)
 241 {
 242     int i;
 243     long (*cb) (BIO *, int, const char *, int, long, long);
 244
 245     if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL)) {
 246         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNSUPPORTED_METHOD);
 247         return (-2);
 248     }
 249
 250     cb = b->callback;
 251
 252     if ((cb != NULL) && ((i = (int)cb(b, BIO_CB_PUTS, in, 0, 0L, 1L)) <= 0))
 253         return (i);
 254
 255     if (!b->init) {
 256         BIOerr(BIO_F_BIO_PUTS, BIO_R_UNINITIALIZED);
 257         return (-2);
 258     }
 259
 260     i = b->method->bputs(b, in);
 261
 262     if (i > 0)
 263         b->num_write += (uint64_t)i;
 264
 265     if (cb != NULL)
 266         i = (int)cb(b, BIO_CB_PUTS | BIO_CB_RETURN, in, 0, 0L, (long)i);
 267     return (i);
 268 }
 269
 270 int BIO_gets(BIO *b, char *in, int inl)
 271 {
 272     int i;
 273     long (*cb) (BIO *, int, const char *, int, long, long);
 274
 275     if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL)) {
 276         BIOerr(BIO_F_BIO_GETS, BIO_R_UNSUPPORTED_METHOD);
 277         return (-2);
 278     }
 279
 280     cb = b->callback;
 281
 282     if ((cb != NULL) && ((i = (int)cb(b, BIO_CB_GETS, in, inl, 0L, 1L)) <= 0))
 283         return (i);
 284
 285     if (!b->init) {
 286         BIOerr(BIO_F_BIO_GETS, BIO_R_UNINITIALIZED);
 287         return (-2);
 288     }
 289
 290     i = b->method->bgets(b, in, inl);
 291
 292     if (cb != NULL)
 293         i = (int)cb(b, BIO_CB_GETS | BIO_CB_RETURN, in, inl, 0L, (long)i);
 294     return (i);
 295 }
 296
 297 int BIO_indent(BIO *b, int indent, int max)
 298 {
 299     if (indent < 0)
 300         indent = 0;
 301     if (indent > max)
 302         indent = max;
 303     while (indent--)
 304         if (BIO_puts(b, " ") != 1)
 305             return 0;
 306     return 1;
 307 }
 308
 309 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
 310 {
 311     int i;
 312
 313     i = iarg;
 314     return (BIO_ctrl(b, cmd, larg, (char *)&i));
 315 }
 316
 317 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
 318 {
 319     void *p = NULL;
 320
 321     if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
 322         return (NULL);
 323     else
 324         return (p);
 325 }
 326
 327 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
 328 {
 329     long ret;
 330     long (*cb) (BIO *, int, const char *, int, long, long);
 331
 332     if (b == NULL)
 333         return (0);
 334
 335     if ((b->method == NULL) || (b->method->ctrl == NULL)) {
 336         BIOerr(BIO_F_BIO_CTRL, BIO_R_UNSUPPORTED_METHOD);
 337         return (-2);
 338     }
 339
 340     cb = b->callback;
 341
 342     if ((cb != NULL) &&
 343         ((ret = cb(b, BIO_CB_CTRL, parg, cmd, larg, 1L)) <= 0))
 344         return (ret);
 345
 346     ret = b->method->ctrl(b, cmd, larg, parg);
 347
 348     if (cb != NULL)
 349         ret = cb(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, cmd, larg, ret);
 350     return (ret);
 351 }
 352
 353 long BIO_callback_ctrl(BIO *b, int cmd,
 354                        void (*fp) (struct bio_st *, int, const char *, int,
 355                                    long, long))
 356 {
 357     long ret;
 358     long (*cb) (BIO *, int, const char *, int, long, long);
 359
 360     if (b == NULL)
 361         return (0);
 362
 363     if ((b->method == NULL) || (b->method->callback_ctrl == NULL)) {
 364         BIOerr(BIO_F_BIO_CALLBACK_CTRL, BIO_R_UNSUPPORTED_METHOD);
 365         return (-2);
 366     }
 367
 368     cb = b->callback;
 369
 370     if ((cb != NULL) &&
 371         ((ret = cb(b, BIO_CB_CTRL, (void *)&fp, cmd, 0, 1L)) <= 0))
 372         return (ret);
 373
 374     ret = b->method->callback_ctrl(b, cmd, fp);
 375
 376     if (cb != NULL)
 377         ret = cb(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, cmd, 0, ret);
 378     return (ret);
 379 }
 380
 381 /*
 382  * It is unfortunate to duplicate in functions what the BIO_(w)pending macros
 383  * do; but those macros have inappropriate return type, and for interfacing
 384  * from other programming languages, C macros aren't much of a help anyway.
 385  */
 386 size_t BIO_ctrl_pending(BIO *bio)
 387 {
 388     return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);
 389 }
 390
 391 size_t BIO_ctrl_wpending(BIO *bio)
 392 {
 393     return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);
 394 }
 395
 396 /* put the 'bio' on the end of b's list of operators */
 397 BIO *BIO_push(BIO *b, BIO *bio)
 398 {
 399     BIO *lb;
 400
 401     if (b == NULL)
 402         return (bio);
 403     lb = b;
 404     while (lb->next_bio != NULL)
 405         lb = lb->next_bio;
 406     lb->next_bio = bio;
 407     if (bio != NULL)
 408         bio->prev_bio = lb;
 409     /* called to do internal processing */
 410     BIO_ctrl(b, BIO_CTRL_PUSH, 0, lb);
 411     return (b);
 412 }
 413
 414 /* Remove the first and return the rest */
 415 BIO *BIO_pop(BIO *b)
 416 {
 417     BIO *ret;
 418
 419     if (b == NULL)
 420         return (NULL);
 421     ret = b->next_bio;
 422
 423     BIO_ctrl(b, BIO_CTRL_POP, 0, b);
 424
 425     if (b->prev_bio != NULL)
 426         b->prev_bio->next_bio = b->next_bio;
 427     if (b->next_bio != NULL)
 428         b->next_bio->prev_bio = b->prev_bio;
 429
 430     b->next_bio = NULL;
 431     b->prev_bio = NULL;
 432     return (ret);
 433 }
 434
 435 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
 436 {
 437     BIO *b, *last;
 438
 439     b = last = bio;
 440     for (;;) {
 441         if (!BIO_should_retry(b))
 442             break;
 443         last = b;
 444         b = b->next_bio;
 445         if (b == NULL)
 446             break;
 447     }
 448     if (reason != NULL)
 449         *reason = last->retry_reason;
 450     return (last);
 451 }
 452
 453 int BIO_get_retry_reason(BIO *bio)
 454 {
 455     return (bio->retry_reason);
 456 }
 457
 458 void BIO_set_retry_reason(BIO *bio, int reason)
 459 {
 460     bio->retry_reason = reason;
 461 }
 462
 463 BIO *BIO_find_type(BIO *bio, int type)
 464 {
 465     int mt, mask;
 466
 467     if (bio == NULL)
 468         return NULL;
 469     mask = type & 0xff;
 470     do {
 471         if (bio->method != NULL) {
 472             mt = bio->method->type;
 473
 474             if (!mask) {
 475                 if (mt & type)
 476                     return (bio);
 477             } else if (mt == type)
 478                 return (bio);
 479         }
 480         bio = bio->next_bio;
 481     } while (bio != NULL);
 482     return (NULL);
 483 }
 484
 485 BIO *BIO_next(BIO *b)
 486 {
 487     if (b == NULL)
 488         return NULL;
 489     return b->next_bio;
 490 }
 491
 492 void BIO_set_next(BIO *b, BIO *next)
 493 {
 494     b->next_bio = next;
 495 }
 496
 497 void BIO_free_all(BIO *bio)
 498 {
 499     BIO *b;
 500     int ref;
 501
 502     while (bio != NULL) {
 503         b = bio;
 504         ref = b->references;
 505         bio = bio->next_bio;
 506         BIO_free(b);
 507         /* Since ref count > 1, don't free anyone else. */
 508         if (ref > 1)
 509             break;
 510     }
 511 }
 512
 513 BIO *BIO_dup_chain(BIO *in)
 514 {
 515     BIO *ret = NULL, *eoc = NULL, *bio, *new_bio;
 516
 517     for (bio = in; bio != NULL; bio = bio->next_bio) {
 518         if ((new_bio = BIO_new(bio->method)) == NULL)
 519             goto err;
 520         new_bio->callback = bio->callback;
 521         new_bio->cb_arg = bio->cb_arg;
 522         new_bio->init = bio->init;
 523         new_bio->shutdown = bio->shutdown;
 524         new_bio->flags = bio->flags;
 525
 526         /* This will let SSL_s_sock() work with stdin/stdout */
 527         new_bio->num = bio->num;
 528
 529         if (!BIO_dup_state(bio, (char *)new_bio)) {
 530             BIO_free(new_bio);
 531             goto err;
 532         }
 533
 534         /* copy app data */
 535         if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new_bio->ex_data,
 536                                 &bio->ex_data)) {
 537             BIO_free(new_bio);
 538             goto err;
 539         }
 540
 541         if (ret == NULL) {
 542             eoc = new_bio;
 543             ret = eoc;
 544         } else {
 545             BIO_push(eoc, new_bio);
 546             eoc = new_bio;
 547         }
 548     }
 549     return (ret);
 550  err:
 551     BIO_free_all(ret);
 552
 553     return (NULL);
 554 }
 555
 556 void BIO_copy_next_retry(BIO *b)
 557 {
 558     BIO_set_flags(b, BIO_get_retry_flags(b->next_bio));
 559     b->retry_reason = b->next_bio->retry_reason;
 560 }
 561
 562 int BIO_set_ex_data(BIO *bio, int idx, void *data)
 563 {
 564     return (CRYPTO_set_ex_data(&(bio->ex_data), idx, data));
 565 }
 566
 567 void *BIO_get_ex_data(BIO *bio, int idx)
 568 {
 569     return (CRYPTO_get_ex_data(&(bio->ex_data), idx));
 570 }
 571
 572 uint64_t BIO_number_read(BIO *bio)
 573 {
 574     if (bio)
 575         return bio->num_read;
 576     return 0;
 577 }
 578
 579 uint64_t BIO_number_written(BIO *bio)
 580 {
 581     if (bio)
 582         return bio->num_write;
 583     return 0;
 584 }
 585
 586 void bio_free_ex_data(BIO *bio)
 587 {
 588     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
 589 }
 590
 591 void bio_cleanup(void)
 592 {
 593 #ifndef OPENSSL_NO_SOCK
 594     bio_sock_cleanup_int();
 595     CRYPTO_THREAD_lock_free(bio_lookup_lock);
 596     bio_lookup_lock = NULL;
 597 #endif
 598 }