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
10 #define OPENSSL_SUPPRESS_DEPRECATED
14 #include <openssl/crypto.h>
15 #include "bio_local.h"
18 * Helper macro for the callback to determine whether an operator expects a
19 * len parameter or not
21 #define HAS_LEN_OPER(o) ((o) == BIO_CB_READ || (o) == BIO_CB_WRITE \
22 || (o) == BIO_CB_GETS)
24 #ifndef OPENSSL_NO_DEPRECATED_3_0
25 # define HAS_CALLBACK(b) ((b)->callback != NULL || (b)->callback_ex != NULL)
27 # define HAS_CALLBACK(b) ((b)->callback_ex != NULL)
30 * Helper function to work out whether to call the new style callback or the old
31 * one, and translate between the two.
33 * This has a long return type for consistency with the old callback. Similarly
34 * for the "long" used for "inret"
36 static long bio_call_callback(BIO *b, int oper, const char *argp, size_t len,
37 int argi, long argl, long inret,
41 #ifndef OPENSSL_NO_DEPRECATED_3_0
44 if (b->callback_ex != NULL)
46 return b->callback_ex(b, oper, argp, len, argi, argl, inret, processed);
48 #ifndef OPENSSL_NO_DEPRECATED_3_0
49 /* Strip off any BIO_CB_RETURN flag */
50 bareoper = oper & ~BIO_CB_RETURN;
53 * We have an old style callback, so we will have to do nasty casts and
54 * check for overflows.
56 if (HAS_LEN_OPER(bareoper)) {
57 /* In this case |len| is set, and should be used instead of |argi| */
64 if (inret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
65 if (*processed > INT_MAX)
70 ret = b->callback(b, oper, argp, argi, argl, inret);
72 if (ret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
73 *processed = (size_t)ret;
80 BIO *BIO_new_ex(OSSL_LIB_CTX *libctx, const BIO_METHOD *method)
82 BIO *bio = OPENSSL_zalloc(sizeof(*bio));
85 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
94 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data))
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);
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);
110 if (method->create == NULL)
120 BIO *BIO_new(const BIO_METHOD *method)
122 return BIO_new_ex(NULL, method);
132 if (CRYPTO_DOWN_REF(&a->references, &ret, a->lock) <= 0)
135 REF_PRINT_COUNT("BIO", a);
138 REF_ASSERT_ISNT(ret < 0);
140 if (HAS_CALLBACK(a)) {
141 ret = (int)bio_call_callback(a, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL);
146 if ((a->method != NULL) && (a->method->destroy != NULL))
147 a->method->destroy(a);
149 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
151 CRYPTO_THREAD_lock_free(a->lock);
158 void BIO_set_data(BIO *a, void *ptr)
163 void *BIO_get_data(BIO *a)
168 void BIO_set_init(BIO *a, int init)
173 int BIO_get_init(BIO *a)
178 void BIO_set_shutdown(BIO *a, int shut)
183 int BIO_get_shutdown(BIO *a)
188 void BIO_vfree(BIO *a)
193 int BIO_up_ref(BIO *a)
197 if (CRYPTO_UP_REF(&a->references, &i, a->lock) <= 0)
200 REF_PRINT_COUNT("BIO", a);
201 REF_ASSERT_ISNT(i < 2);
205 void BIO_clear_flags(BIO *b, int flags)
210 int BIO_test_flags(const BIO *b, int flags)
212 return (b->flags & flags);
215 void BIO_set_flags(BIO *b, int flags)
220 #ifndef OPENSSL_NO_DEPRECATED_3_0
221 BIO_callback_fn BIO_get_callback(const BIO *b)
226 void BIO_set_callback(BIO *b, BIO_callback_fn cb)
232 BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b)
234 return b->callback_ex;
237 void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex cb)
242 void BIO_set_callback_arg(BIO *b, char *arg)
247 char *BIO_get_callback_arg(const BIO *b)
252 const char *BIO_method_name(const BIO *b)
254 return b->method->name;
257 int BIO_method_type(const BIO *b)
259 return b->method->type;
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.
268 static int bio_read_intern(BIO *b, void *data, size_t dlen, size_t *readbytes)
273 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
276 if (b->method == NULL || b->method->bread == NULL) {
277 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
281 if (HAS_CALLBACK(b) &&
282 ((ret = (int)bio_call_callback(b, BIO_CB_READ, data, dlen, 0, 0L, 1L,
287 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
291 ret = b->method->bread(b, data, dlen, readbytes);
294 b->num_read += (uint64_t)*readbytes;
297 ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, data,
298 dlen, 0, 0L, ret, readbytes);
300 /* Shouldn't happen */
301 if (ret > 0 && *readbytes > dlen) {
302 ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
309 int BIO_read(BIO *b, void *data, int dlen)
317 ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
320 /* *readbytes should always be <= dlen */
321 ret = (int)readbytes;
327 int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes)
329 return bio_read_intern(b, data, dlen, readbytes) > 0;
332 static int bio_write_intern(BIO *b, const void *data, size_t dlen,
335 size_t local_written;
341 * b == NULL is not an error but just means that zero bytes are written.
342 * Do not raise an error here.
347 if (b->method == NULL || b->method->bwrite == NULL) {
348 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
352 if (HAS_CALLBACK(b) &&
353 ((ret = (int)bio_call_callback(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L,
358 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
362 ret = b->method->bwrite(b, data, dlen, &local_written);
365 b->num_write += (uint64_t)local_written;
368 ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, data,
369 dlen, 0, 0L, ret, &local_written);
372 *written = local_written;
376 int BIO_write(BIO *b, const void *data, int dlen)
384 ret = bio_write_intern(b, data, (size_t)dlen, &written);
387 /* written should always be <= dlen */
394 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
396 return bio_write_intern(b, data, dlen, written) > 0
397 || (b != NULL && dlen == 0); /* order is important for *written */
400 int BIO_puts(BIO *b, const char *buf)
406 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
409 if (b->method == NULL || b->method->bputs == NULL) {
410 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
414 if (HAS_CALLBACK(b)) {
415 ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
421 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
425 ret = b->method->bputs(b, buf);
428 b->num_write += (uint64_t)ret;
434 ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
438 if (written > INT_MAX) {
439 ERR_raise(ERR_LIB_BIO, BIO_R_LENGTH_TOO_LONG);
449 int BIO_gets(BIO *b, char *buf, int size)
452 size_t readbytes = 0;
455 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
458 if (b->method == NULL || b->method->bgets == NULL) {
459 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
464 ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_ARGUMENT);
468 if (HAS_CALLBACK(b)) {
469 ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
475 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
479 ret = b->method->bgets(b, buf, size);
487 ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
488 0, 0L, ret, &readbytes);
491 /* Shouldn't happen */
492 if (readbytes > (size_t)size)
495 ret = (int)readbytes;
501 int BIO_get_line(BIO *bio, char *buf, int size)
507 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
511 ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_ARGUMENT);
517 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
521 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
525 while (size-- > 1 && (ret = BIO_read(bio, ptr, 1)) > 0)
529 return ret > 0 || BIO_eof(bio) ? ptr - buf : ret;
532 int BIO_indent(BIO *b, int indent, int max)
539 if (BIO_puts(b, " ") != 1)
544 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
549 return BIO_ctrl(b, cmd, larg, (char *)&i);
552 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
556 if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
562 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
568 if (b->method == NULL || b->method->ctrl == NULL) {
569 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
573 if (HAS_CALLBACK(b)) {
574 ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
579 ret = b->method->ctrl(b, cmd, larg, parg);
582 ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
588 long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
594 if (b->method == NULL || b->method->callback_ctrl == NULL
595 || cmd != BIO_CTRL_SET_CALLBACK) {
596 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
600 if (HAS_CALLBACK(b)) {
601 ret = bio_call_callback(b, BIO_CB_CTRL, (void *)&fp, 0, cmd, 0, 1L,
607 ret = b->method->callback_ctrl(b, cmd, fp);
610 ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, 0,
617 * It is unfortunate to duplicate in functions what the BIO_(w)pending macros
618 * do; but those macros have inappropriate return type, and for interfacing
619 * from other programming languages, C macros aren't much of a help anyway.
621 size_t BIO_ctrl_pending(BIO *bio)
623 return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);
626 size_t BIO_ctrl_wpending(BIO *bio)
628 return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);
631 /* put the 'bio' on the end of b's list of operators */
632 BIO *BIO_push(BIO *b, BIO *bio)
639 while (lb->next_bio != NULL)
644 /* called to do internal processing */
645 BIO_ctrl(b, BIO_CTRL_PUSH, 0, lb);
649 /* Remove the first and return the rest */
658 BIO_ctrl(b, BIO_CTRL_POP, 0, b);
660 if (b->prev_bio != NULL)
661 b->prev_bio->next_bio = b->next_bio;
662 if (b->next_bio != NULL)
663 b->next_bio->prev_bio = b->prev_bio;
670 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
676 if (!BIO_should_retry(b))
684 *reason = last->retry_reason;
688 int BIO_get_retry_reason(BIO *bio)
690 return bio->retry_reason;
693 void BIO_set_retry_reason(BIO *bio, int reason)
695 bio->retry_reason = reason;
698 BIO *BIO_find_type(BIO *bio, int type)
703 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
708 if (bio->method != NULL) {
709 mt = bio->method->type;
714 } else if (mt == type) {
719 } while (bio != NULL);
723 BIO *BIO_next(BIO *b)
730 void BIO_set_next(BIO *b, BIO *next)
735 void BIO_free_all(BIO *bio)
740 while (bio != NULL) {
745 /* Since ref count > 1, don't free anyone else. */
751 BIO *BIO_dup_chain(BIO *in)
753 BIO *ret = NULL, *eoc = NULL, *bio, *new_bio;
755 for (bio = in; bio != NULL; bio = bio->next_bio) {
756 if ((new_bio = BIO_new(bio->method)) == NULL)
758 #ifndef OPENSSL_NO_DEPRECATED_3_0
759 new_bio->callback = bio->callback;
761 new_bio->callback_ex = bio->callback_ex;
762 new_bio->cb_arg = bio->cb_arg;
763 new_bio->init = bio->init;
764 new_bio->shutdown = bio->shutdown;
765 new_bio->flags = bio->flags;
767 /* This will let SSL_s_sock() work with stdin/stdout */
768 new_bio->num = bio->num;
770 if (!BIO_dup_state(bio, (char *)new_bio)) {
776 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new_bio->ex_data,
786 BIO_push(eoc, new_bio);
797 void BIO_copy_next_retry(BIO *b)
799 BIO_set_flags(b, BIO_get_retry_flags(b->next_bio));
800 b->retry_reason = b->next_bio->retry_reason;
803 int BIO_set_ex_data(BIO *bio, int idx, void *data)
805 return CRYPTO_set_ex_data(&(bio->ex_data), idx, data);
808 void *BIO_get_ex_data(const BIO *bio, int idx)
810 return CRYPTO_get_ex_data(&(bio->ex_data), idx);
813 uint64_t BIO_number_read(BIO *bio)
816 return bio->num_read;
820 uint64_t BIO_number_written(BIO *bio)
823 return bio->num_write;
827 void bio_free_ex_data(BIO *bio)
829 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
832 void bio_cleanup(void)
834 #ifndef OPENSSL_NO_SOCK
835 bio_sock_cleanup_int();
836 CRYPTO_THREAD_lock_free(bio_lookup_lock);
837 bio_lookup_lock = NULL;
839 CRYPTO_THREAD_lock_free(bio_type_lock);
840 bio_type_lock = NULL;
843 /* Internal variant of the below BIO_wait() not calling BIOerr() */
844 static int bio_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
846 #ifndef OPENSSL_NO_SOCK
851 if (max_time == 0) /* no timeout */
854 #ifndef OPENSSL_NO_SOCK
855 if (BIO_get_fd(bio, &fd) > 0 && fd < FD_SETSIZE)
856 return BIO_socket_wait(fd, BIO_should_read(bio), max_time);
858 /* fall back to polling since no sockets are available */
860 sec_diff = (long)(max_time - time(NULL)); /* might overflow */
862 return 0; /* clearly timeout */
864 /* now take a nap at most the given number of milliseconds */
865 if (sec_diff == 0) { /* we are below the 1 seconds resolution of max_time */
866 if (nap_milliseconds > 1000)
867 nap_milliseconds = 1000;
868 } else { /* for sec_diff > 0, take min(sec_diff * 1000, nap_milliseconds) */
869 if ((unsigned long)sec_diff * 1000 < nap_milliseconds)
870 nap_milliseconds = (unsigned int)sec_diff * 1000;
872 ossl_sleep(nap_milliseconds);
877 * Wait on (typically socket-based) BIO at most until max_time.
878 * Succeed immediately if max_time == 0.
879 * If sockets are not available support polling: succeed after waiting at most
880 * the number of nap_milliseconds in order to avoid a tight busy loop.
881 * Call BIOerr(...) on timeout or error.
882 * Returns -1 on error, 0 on timeout, and 1 on success.
884 int BIO_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
886 int rv = bio_wait(bio, max_time, nap_milliseconds);
889 ERR_raise(ERR_LIB_BIO,
890 rv == 0 ? BIO_R_TRANSFER_TIMEOUT : BIO_R_TRANSFER_ERROR);
895 * Connect via given BIO using BIO_do_connect() until success/timeout/error.
896 * Parameter timeout == 0 means no timeout, < 0 means exactly one try.
897 * For non-blocking and potentially even non-socket BIOs perform polling with
898 * the given density: between polls sleep nap_milliseconds using BIO_wait()
899 * in order to avoid a tight busy loop.
900 * Returns -1 on error, 0 on timeout, and 1 on success.
902 int BIO_do_connect_retry(BIO *bio, int timeout, int nap_milliseconds)
904 int blocking = timeout <= 0;
905 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
909 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
913 if (nap_milliseconds < 0)
914 nap_milliseconds = 100;
915 BIO_set_nbio(bio, !blocking);
919 rv = BIO_do_connect(bio);
921 if (rv <= 0) { /* could be timeout or retryable error or fatal error */
922 int err = ERR_peek_last_error();
923 int reason = ERR_GET_REASON(err);
924 int do_retry = BIO_should_retry(bio); /* may be 1 only if !blocking */
926 if (ERR_GET_LIB(err) == ERR_LIB_BIO) {
930 * likely retryable system error occurred, which may be
931 * EAGAIN (resource temporarily unavailable) some 40 secs after
932 * calling getaddrinfo(): Temporary failure in name resolution
933 * or a premature ETIMEDOUT, some 30 seconds after connect()
935 case BIO_R_CONNECT_ERROR:
936 case BIO_R_NBIO_CONNECT_ERROR:
937 /* some likely retryable connection error occurred */
938 (void)BIO_reset(bio); /* often needed to avoid retry failure */
945 if (timeout >= 0 && do_retry) {
947 /* will not actually wait if timeout == 0 (i.e., blocking BIO): */
948 rv = bio_wait(bio, max_time, nap_milliseconds);
951 ERR_raise(ERR_LIB_BIO,
952 rv == 0 ? BIO_R_CONNECT_TIMEOUT : BIO_R_CONNECT_ERROR);
954 ERR_clear_last_mark();
956 if (err == 0) /* missing error queue entry */
957 /* workaround: general error */
958 ERR_raise(ERR_LIB_BIO, BIO_R_CONNECT_ERROR);
961 ERR_clear_last_mark();