2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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
12 #include <openssl/crypto.h>
13 #include "bio_local.h"
14 #include "internal/cryptlib.h"
17 * Helper macro for the callback to determine whether an operator expects a
18 * len parameter or not
20 #define HAS_LEN_OPER(o) ((o) == BIO_CB_READ || (o) == BIO_CB_WRITE \
21 || (o) == BIO_CB_GETS)
24 * Helper function to work out whether to call the new style callback or the old
25 * one, and translate between the two.
27 * This has a long return type for consistency with the old callback. Similarly
28 * for the "long" used for "inret"
30 static long bio_call_callback(BIO *b, int oper, const char *argp, size_t len,
31 int argi, long argl, long inret,
37 if (b->callback_ex != NULL)
38 return b->callback_ex(b, oper, argp, len, argi, argl, inret, processed);
40 /* Strip off any BIO_CB_RETURN flag */
41 bareoper = oper & ~BIO_CB_RETURN;
44 * We have an old style callback, so we will have to do nasty casts and
45 * check for overflows.
47 if (HAS_LEN_OPER(bareoper)) {
48 /* In this case |len| is set, and should be used instead of |argi| */
55 if (inret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
56 if (*processed > INT_MAX)
61 ret = b->callback(b, oper, argp, argi, argl, inret);
63 if (ret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
64 *processed = (size_t)ret;
71 BIO *BIO_new(const BIO_METHOD *method)
73 BIO *bio = OPENSSL_zalloc(sizeof(*bio));
76 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
84 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data))
87 bio->lock = CRYPTO_THREAD_lock_new();
88 if (bio->lock == NULL) {
89 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
90 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
94 if (method->create != NULL && !method->create(bio)) {
95 ERR_raise(ERR_LIB_BIO, ERR_R_INIT_FAIL);
96 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
97 CRYPTO_THREAD_lock_free(bio->lock);
100 if (method->create == NULL)
117 if (CRYPTO_DOWN_REF(&a->references, &ret, a->lock) <= 0)
120 REF_PRINT_COUNT("BIO", a);
123 REF_ASSERT_ISNT(ret < 0);
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);
131 if ((a->method != NULL) && (a->method->destroy != NULL))
132 a->method->destroy(a);
134 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
136 CRYPTO_THREAD_lock_free(a->lock);
143 void BIO_set_data(BIO *a, void *ptr)
148 void *BIO_get_data(BIO *a)
153 void BIO_set_init(BIO *a, int init)
158 int BIO_get_init(BIO *a)
163 void BIO_set_shutdown(BIO *a, int shut)
168 int BIO_get_shutdown(BIO *a)
173 void BIO_vfree(BIO *a)
178 int BIO_up_ref(BIO *a)
182 if (CRYPTO_UP_REF(&a->references, &i, a->lock) <= 0)
185 REF_PRINT_COUNT("BIO", a);
186 REF_ASSERT_ISNT(i < 2);
190 void BIO_clear_flags(BIO *b, int flags)
195 int BIO_test_flags(const BIO *b, int flags)
197 return (b->flags & flags);
200 void BIO_set_flags(BIO *b, int flags)
205 BIO_callback_fn BIO_get_callback(const BIO *b)
210 void BIO_set_callback(BIO *b, BIO_callback_fn cb)
215 BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b)
217 return b->callback_ex;
220 void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex cb)
225 void BIO_set_callback_arg(BIO *b, char *arg)
230 char *BIO_get_callback_arg(const BIO *b)
235 const char *BIO_method_name(const BIO *b)
237 return b->method->name;
240 int BIO_method_type(const BIO *b)
242 return b->method->type;
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.
251 static int bio_read_intern(BIO *b, void *data, size_t dlen, size_t *readbytes)
256 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
259 if (b->method == NULL || b->method->bread == NULL) {
260 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
264 if ((b->callback != NULL || b->callback_ex != NULL) &&
265 ((ret = (int)bio_call_callback(b, BIO_CB_READ, data, dlen, 0, 0L, 1L,
270 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
274 ret = b->method->bread(b, data, dlen, readbytes);
277 b->num_read += (uint64_t)*readbytes;
279 if (b->callback != NULL || b->callback_ex != NULL)
280 ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, data,
281 dlen, 0, 0L, ret, readbytes);
283 /* Shouldn't happen */
284 if (ret > 0 && *readbytes > dlen) {
285 ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
292 int BIO_read(BIO *b, void *data, int dlen)
300 ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
303 /* *readbytes should always be <= dlen */
304 ret = (int)readbytes;
310 int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes)
312 return bio_read_intern(b, data, dlen, readbytes) > 0;
315 static int bio_write_intern(BIO *b, const void *data, size_t dlen,
321 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
324 if (b->method == NULL || b->method->bwrite == NULL) {
325 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
329 if ((b->callback != NULL || b->callback_ex != NULL) &&
330 ((ret = (int)bio_call_callback(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L,
335 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
339 ret = b->method->bwrite(b, data, dlen, written);
342 b->num_write += (uint64_t)*written;
344 if (b->callback != NULL || b->callback_ex != NULL)
345 ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, data,
346 dlen, 0, 0L, ret, written);
351 int BIO_write(BIO *b, const void *data, int dlen)
359 ret = bio_write_intern(b, data, (size_t)dlen, &written);
362 /* *written should always be <= dlen */
369 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
371 return bio_write_intern(b, data, dlen, written) > 0;
374 int BIO_puts(BIO *b, const char *buf)
380 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
383 if (b->method == NULL || b->method->bputs == NULL) {
384 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
388 if (b->callback != NULL || b->callback_ex != NULL) {
389 ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
395 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
399 ret = b->method->bputs(b, buf);
402 b->num_write += (uint64_t)ret;
407 if (b->callback != NULL || b->callback_ex != NULL)
408 ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
412 if (written > INT_MAX) {
413 ERR_raise(ERR_LIB_BIO, BIO_R_LENGTH_TOO_LONG);
423 int BIO_gets(BIO *b, char *buf, int size)
426 size_t readbytes = 0;
429 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
432 if (b->method == NULL || b->method->bgets == NULL) {
433 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
438 ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_ARGUMENT);
442 if (b->callback != NULL || b->callback_ex != NULL) {
443 ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
449 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
453 ret = b->method->bgets(b, buf, size);
460 if (b->callback != NULL || b->callback_ex != NULL)
461 ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
462 0, 0L, ret, &readbytes);
465 /* Shouldn't happen */
466 if (readbytes > (size_t)size)
469 ret = (int)readbytes;
475 int BIO_indent(BIO *b, int indent, int max)
482 if (BIO_puts(b, " ") != 1)
487 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
492 return BIO_ctrl(b, cmd, larg, (char *)&i);
495 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
499 if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
505 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
510 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
513 if (b->method == NULL || b->method->ctrl == NULL) {
514 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
518 if (b->callback != NULL || b->callback_ex != NULL) {
519 ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
524 ret = b->method->ctrl(b, cmd, larg, parg);
526 if (b->callback != NULL || b->callback_ex != NULL)
527 ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
533 long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
538 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
541 if (b->method == NULL || b->method->callback_ctrl == NULL
542 || cmd != BIO_CTRL_SET_CALLBACK) {
543 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
547 if (b->callback != NULL || b->callback_ex != NULL) {
548 ret = bio_call_callback(b, BIO_CB_CTRL, (void *)&fp, 0, cmd, 0, 1L,
554 ret = b->method->callback_ctrl(b, cmd, fp);
556 if (b->callback != NULL || b->callback_ex != NULL)
557 ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, 0,
564 * It is unfortunate to duplicate in functions what the BIO_(w)pending macros
565 * do; but those macros have inappropriate return type, and for interfacing
566 * from other programming languages, C macros aren't much of a help anyway.
568 size_t BIO_ctrl_pending(BIO *bio)
570 return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);
573 size_t BIO_ctrl_wpending(BIO *bio)
575 return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);
578 /* put the 'bio' on the end of b's list of operators */
579 BIO *BIO_push(BIO *b, BIO *bio)
586 while (lb->next_bio != NULL)
591 /* called to do internal processing */
592 BIO_ctrl(b, BIO_CTRL_PUSH, 0, lb);
596 /* Remove the first and return the rest */
602 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
607 BIO_ctrl(b, BIO_CTRL_POP, 0, b);
609 if (b->prev_bio != NULL)
610 b->prev_bio->next_bio = b->next_bio;
611 if (b->next_bio != NULL)
612 b->next_bio->prev_bio = b->prev_bio;
619 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
625 if (!BIO_should_retry(b))
633 *reason = last->retry_reason;
637 int BIO_get_retry_reason(BIO *bio)
639 return bio->retry_reason;
642 void BIO_set_retry_reason(BIO *bio, int reason)
644 bio->retry_reason = reason;
647 BIO *BIO_find_type(BIO *bio, int type)
652 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
657 if (bio->method != NULL) {
658 mt = bio->method->type;
663 } else if (mt == type) {
668 } while (bio != NULL);
672 BIO *BIO_next(BIO *b)
675 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
681 void BIO_set_next(BIO *b, BIO *next)
686 void BIO_free_all(BIO *bio)
691 while (bio != NULL) {
696 /* Since ref count > 1, don't free anyone else. */
702 BIO *BIO_dup_chain(BIO *in)
704 BIO *ret = NULL, *eoc = NULL, *bio, *new_bio;
706 for (bio = in; bio != NULL; bio = bio->next_bio) {
707 if ((new_bio = BIO_new(bio->method)) == NULL)
709 new_bio->callback = bio->callback;
710 new_bio->callback_ex = bio->callback_ex;
711 new_bio->cb_arg = bio->cb_arg;
712 new_bio->init = bio->init;
713 new_bio->shutdown = bio->shutdown;
714 new_bio->flags = bio->flags;
716 /* This will let SSL_s_sock() work with stdin/stdout */
717 new_bio->num = bio->num;
719 if (!BIO_dup_state(bio, (char *)new_bio)) {
725 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new_bio->ex_data,
735 BIO_push(eoc, new_bio);
746 void BIO_copy_next_retry(BIO *b)
748 BIO_set_flags(b, BIO_get_retry_flags(b->next_bio));
749 b->retry_reason = b->next_bio->retry_reason;
752 int BIO_set_ex_data(BIO *bio, int idx, void *data)
754 return CRYPTO_set_ex_data(&(bio->ex_data), idx, data);
757 void *BIO_get_ex_data(const BIO *bio, int idx)
759 return CRYPTO_get_ex_data(&(bio->ex_data), idx);
762 uint64_t BIO_number_read(BIO *bio)
765 return bio->num_read;
769 uint64_t BIO_number_written(BIO *bio)
772 return bio->num_write;
776 void bio_free_ex_data(BIO *bio)
778 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
781 void bio_cleanup(void)
783 #ifndef OPENSSL_NO_SOCK
784 bio_sock_cleanup_int();
785 CRYPTO_THREAD_lock_free(bio_lookup_lock);
786 bio_lookup_lock = NULL;
788 CRYPTO_THREAD_lock_free(bio_type_lock);
789 bio_type_lock = NULL;
792 /* Internal variant of the below BIO_wait() not calling BIOerr() */
793 static int bio_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
795 #ifndef OPENSSL_NO_SOCK
800 if (max_time == 0) /* no timeout */
803 #ifndef OPENSSL_NO_SOCK
804 if (BIO_get_fd(bio, &fd) > 0 && fd < FD_SETSIZE)
805 return BIO_socket_wait(fd, BIO_should_read(bio), max_time);
807 /* fall back to polling since no sockets are available */
809 sec_diff = (long)(max_time - time(NULL)); /* might overflow */
811 return 0; /* clearly timeout */
813 /* now take a nap at most the given number of milliseconds */
814 if (sec_diff == 0) { /* we are below the 1 seconds resolution of max_time */
815 if (nap_milliseconds > 1000)
816 nap_milliseconds = 1000;
817 } else { /* for sec_diff > 0, take min(sec_diff * 1000, nap_milliseconds) */
818 if ((unsigned long)sec_diff * 1000 < nap_milliseconds)
819 nap_milliseconds = (unsigned int)sec_diff * 1000;
821 ossl_sleep(nap_milliseconds);
826 * Wait on (typically socket-based) BIO at most until max_time.
827 * Succeed immediately if max_time == 0.
828 * If sockets are not available support polling: succeed after waiting at most
829 * the number of nap_milliseconds in order to avoid a tight busy loop.
830 * Call BIOerr(...) on timeout or error.
831 * Returns -1 on error, 0 on timeout, and 1 on success.
833 int BIO_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
835 int rv = bio_wait(bio, max_time, nap_milliseconds);
838 ERR_raise(ERR_LIB_BIO,
839 rv == 0 ? BIO_R_TRANSFER_TIMEOUT : BIO_R_TRANSFER_ERROR);
844 * Connect via given BIO using BIO_do_connect() until success/timeout/error.
845 * Parameter timeout == 0 means no timeout, < 0 means exactly one try.
846 * For non-blocking and potentially even non-socket BIOs perform polling with
847 * the given density: between polls sleep nap_milliseconds using BIO_wait()
848 * in order to avoid a tight busy loop.
849 * Returns -1 on error, 0 on timeout, and 1 on success.
851 int BIO_do_connect_retry(BIO *bio, int timeout, int nap_milliseconds)
853 int blocking = timeout <= 0;
854 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
858 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
862 if (nap_milliseconds < 0)
863 nap_milliseconds = 100;
864 BIO_set_nbio(bio, !blocking);
867 rv = BIO_do_connect(bio); /* This may indirectly call ERR_clear_error(); */
869 if (rv <= 0) { /* could be timeout or retryable error or fatal error */
870 int err = ERR_peek_last_error();
871 int reason = ERR_GET_REASON(err);
872 int do_retry = BIO_should_retry(bio); /* may be 1 only if !blocking */
874 if (ERR_GET_LIB(err) == ERR_LIB_BIO) {
878 * likely retryable system error occurred, which may be
879 * EAGAIN (resource temporarily unavailable) some 40 secs after
880 * calling getaddrinfo(): Temporary failure in name resolution
881 * or a premature ETIMEDOUT, some 30 seconds after connect()
883 case BIO_R_CONNECT_ERROR:
884 case BIO_R_NBIO_CONNECT_ERROR:
885 /* some likely retryable connection error occurred */
886 (void)BIO_reset(bio); /* often needed to avoid retry failure */
893 if (timeout >= 0 && do_retry) {
894 ERR_clear_error(); /* using ERR_pop_to_mark() would be cleaner */
895 /* will not actually wait if timeout == 0 (i.e., blocking BIO): */
896 rv = bio_wait(bio, max_time, nap_milliseconds);
899 ERR_raise(ERR_LIB_BIO,
900 rv == 0 ? BIO_R_CONNECT_TIMEOUT : BIO_R_CONNECT_ERROR);
903 if (err == 0) /* missing error queue entry */
904 /* workaround: general error */
905 ERR_raise(ERR_LIB_BIO, BIO_R_CONNECT_ERROR);