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 "internal/numbers.h"
16 #include "bio_local.h"
19 * Helper macro for the callback to determine whether an operator expects a
20 * len parameter or not
22 #define HAS_LEN_OPER(o) ((o) == BIO_CB_READ || (o) == BIO_CB_WRITE \
23 || (o) == BIO_CB_GETS)
25 #ifndef OPENSSL_NO_DEPRECATED_3_0
26 # define HAS_CALLBACK(b) ((b)->callback != NULL || (b)->callback_ex != NULL)
28 # define HAS_CALLBACK(b) ((b)->callback_ex != NULL)
31 * Helper function to work out whether to call the new style callback or the old
32 * one, and translate between the two.
34 * This has a long return type for consistency with the old callback. Similarly
35 * for the "long" used for "inret"
37 static long bio_call_callback(BIO *b, int oper, const char *argp, size_t len,
38 int argi, long argl, long inret,
42 #ifndef OPENSSL_NO_DEPRECATED_3_0
45 if (b->callback_ex != NULL)
47 return b->callback_ex(b, oper, argp, len, argi, argl, inret, processed);
49 #ifndef OPENSSL_NO_DEPRECATED_3_0
50 /* Strip off any BIO_CB_RETURN flag */
51 bareoper = oper & ~BIO_CB_RETURN;
54 * We have an old style callback, so we will have to do nasty casts and
55 * check for overflows.
57 if (HAS_LEN_OPER(bareoper)) {
58 /* In this case |len| is set, and should be used instead of |argi| */
65 if (inret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
66 if (*processed > INT_MAX)
71 ret = b->callback(b, oper, argp, argi, argl, inret);
73 if (ret > 0 && (oper & BIO_CB_RETURN) && bareoper != BIO_CB_CTRL) {
74 *processed = (size_t)ret;
81 BIO *BIO_new_ex(OSSL_LIB_CTX *libctx, const BIO_METHOD *method)
83 BIO *bio = OPENSSL_zalloc(sizeof(*bio));
93 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data))
96 bio->lock = CRYPTO_THREAD_lock_new();
97 if (bio->lock == NULL) {
98 ERR_raise(ERR_LIB_BIO, ERR_R_CRYPTO_LIB);
99 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
103 if (method->create != NULL && !method->create(bio)) {
104 ERR_raise(ERR_LIB_BIO, ERR_R_INIT_FAIL);
105 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
106 CRYPTO_THREAD_lock_free(bio->lock);
109 if (method->create == NULL)
119 BIO *BIO_new(const BIO_METHOD *method)
121 return BIO_new_ex(NULL, method);
131 if (CRYPTO_DOWN_REF(&a->references, &ret, a->lock) <= 0)
134 REF_PRINT_COUNT("BIO", a);
137 REF_ASSERT_ISNT(ret < 0);
139 if (HAS_CALLBACK(a)) {
140 ret = (int)bio_call_callback(a, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL);
145 if ((a->method != NULL) && (a->method->destroy != NULL))
146 a->method->destroy(a);
148 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
150 CRYPTO_THREAD_lock_free(a->lock);
157 void BIO_set_data(BIO *a, void *ptr)
162 void *BIO_get_data(BIO *a)
167 void BIO_set_init(BIO *a, int init)
172 int BIO_get_init(BIO *a)
177 void BIO_set_shutdown(BIO *a, int shut)
182 int BIO_get_shutdown(BIO *a)
187 void BIO_vfree(BIO *a)
192 int BIO_up_ref(BIO *a)
196 if (CRYPTO_UP_REF(&a->references, &i, a->lock) <= 0)
199 REF_PRINT_COUNT("BIO", a);
200 REF_ASSERT_ISNT(i < 2);
204 void BIO_clear_flags(BIO *b, int flags)
209 int BIO_test_flags(const BIO *b, int flags)
211 return (b->flags & flags);
214 void BIO_set_flags(BIO *b, int flags)
219 #ifndef OPENSSL_NO_DEPRECATED_3_0
220 BIO_callback_fn BIO_get_callback(const BIO *b)
225 void BIO_set_callback(BIO *b, BIO_callback_fn cb)
231 BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b)
233 return b->callback_ex;
236 void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex cb)
241 void BIO_set_callback_arg(BIO *b, char *arg)
246 char *BIO_get_callback_arg(const BIO *b)
251 const char *BIO_method_name(const BIO *b)
253 return b->method->name;
256 int BIO_method_type(const BIO *b)
258 return b->method->type;
262 * This is essentially the same as BIO_read_ex() except that it allows
263 * 0 or a negative value to indicate failure (retryable or not) in the return.
264 * This is for compatibility with the old style BIO_read(), where existing code
265 * may make assumptions about the return value that it might get.
267 static int bio_read_intern(BIO *b, void *data, size_t dlen, size_t *readbytes)
272 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
275 if (b->method == NULL || b->method->bread == NULL) {
276 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
280 if (HAS_CALLBACK(b) &&
281 ((ret = (int)bio_call_callback(b, BIO_CB_READ, data, dlen, 0, 0L, 1L,
286 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
290 ret = b->method->bread(b, data, dlen, readbytes);
293 b->num_read += (uint64_t)*readbytes;
296 ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, data,
297 dlen, 0, 0L, ret, readbytes);
299 /* Shouldn't happen */
300 if (ret > 0 && *readbytes > dlen) {
301 ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
308 int BIO_read(BIO *b, void *data, int dlen)
316 ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
319 /* *readbytes should always be <= dlen */
320 ret = (int)readbytes;
326 int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes)
328 return bio_read_intern(b, data, dlen, readbytes) > 0;
331 static int bio_write_intern(BIO *b, const void *data, size_t dlen,
334 size_t local_written;
340 * b == NULL is not an error but just means that zero bytes are written.
341 * Do not raise an error here.
346 if (b->method == NULL || b->method->bwrite == NULL) {
347 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
351 if (HAS_CALLBACK(b) &&
352 ((ret = (int)bio_call_callback(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L,
357 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
361 ret = b->method->bwrite(b, data, dlen, &local_written);
364 b->num_write += (uint64_t)local_written;
367 ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, data,
368 dlen, 0, 0L, ret, &local_written);
371 *written = local_written;
375 int BIO_write(BIO *b, const void *data, int dlen)
383 ret = bio_write_intern(b, data, (size_t)dlen, &written);
386 /* written should always be <= dlen */
393 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
395 return bio_write_intern(b, data, dlen, written) > 0
396 || (b != NULL && dlen == 0); /* order is important for *written */
399 int BIO_sendmmsg(BIO *b, BIO_MSG *msg,
400 size_t stride, size_t num_msg, uint64_t flags,
401 size_t *msgs_processed)
404 BIO_MMSG_CB_ARGS args;
408 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
412 if (b->method == NULL || b->method->bsendmmsg == NULL) {
414 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
418 if (HAS_CALLBACK(b)) {
420 args.stride = stride;
421 args.num_msg = num_msg;
423 args.msgs_processed = msgs_processed;
425 ret = (size_t)bio_call_callback(b, BIO_CB_SENDMMSG, (void *)&args,
433 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
437 ret = b->method->bsendmmsg(b, msg, stride, num_msg, flags, msgs_processed);
440 ret = (size_t)bio_call_callback(b, BIO_CB_SENDMMSG | BIO_CB_RETURN,
441 (void *)&args, ret, 0, 0, 0, NULL);
446 int BIO_recvmmsg(BIO *b, BIO_MSG *msg,
447 size_t stride, size_t num_msg, uint64_t flags,
448 size_t *msgs_processed)
451 BIO_MMSG_CB_ARGS args;
455 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
459 if (b->method == NULL || b->method->brecvmmsg == NULL) {
461 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
465 if (HAS_CALLBACK(b)) {
467 args.stride = stride;
468 args.num_msg = num_msg;
470 args.msgs_processed = msgs_processed;
472 ret = bio_call_callback(b, BIO_CB_RECVMMSG, (void *)&args,
480 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
484 ret = b->method->brecvmmsg(b, msg, stride, num_msg, flags, msgs_processed);
487 ret = (size_t)bio_call_callback(b, BIO_CB_RECVMMSG | BIO_CB_RETURN,
488 (void *)&args, ret, 0, 0, 0, NULL);
493 int BIO_puts(BIO *b, const char *buf)
499 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
502 if (b->method == NULL || b->method->bputs == NULL) {
503 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
507 if (HAS_CALLBACK(b)) {
508 ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
514 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
518 ret = b->method->bputs(b, buf);
521 b->num_write += (uint64_t)ret;
527 ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
531 if (written > INT_MAX) {
532 ERR_raise(ERR_LIB_BIO, BIO_R_LENGTH_TOO_LONG);
542 int BIO_gets(BIO *b, char *buf, int size)
545 size_t readbytes = 0;
548 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
551 if (b->method == NULL || b->method->bgets == NULL) {
552 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
557 ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_ARGUMENT);
561 if (HAS_CALLBACK(b)) {
562 ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
568 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
572 ret = b->method->bgets(b, buf, size);
580 ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
581 0, 0L, ret, &readbytes);
584 /* Shouldn't happen */
585 if (readbytes > (size_t)size)
588 ret = (int)readbytes;
594 int BIO_get_line(BIO *bio, char *buf, int size)
600 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
604 ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_ARGUMENT);
610 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
614 ERR_raise(ERR_LIB_BIO, BIO_R_UNINITIALIZED);
618 while (size-- > 1 && (ret = BIO_read(bio, ptr, 1)) > 0)
622 return ret > 0 || BIO_eof(bio) ? ptr - buf : ret;
625 int BIO_indent(BIO *b, int indent, int max)
632 if (BIO_puts(b, " ") != 1)
637 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
642 return BIO_ctrl(b, cmd, larg, (char *)&i);
645 void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
649 if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)
655 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
661 if (b->method == NULL || b->method->ctrl == NULL) {
662 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
666 if (HAS_CALLBACK(b)) {
667 ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
672 ret = b->method->ctrl(b, cmd, larg, parg);
675 ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
681 long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
687 if (b->method == NULL || b->method->callback_ctrl == NULL
688 || cmd != BIO_CTRL_SET_CALLBACK) {
689 ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
693 if (HAS_CALLBACK(b)) {
694 ret = bio_call_callback(b, BIO_CB_CTRL, (void *)&fp, 0, cmd, 0, 1L,
700 ret = b->method->callback_ctrl(b, cmd, fp);
703 ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, 0,
710 * It is unfortunate to duplicate in functions what the BIO_(w)pending macros
711 * do; but those macros have inappropriate return type, and for interfacing
712 * from other programming languages, C macros aren't much of a help anyway.
714 size_t BIO_ctrl_pending(BIO *bio)
716 long ret = BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);
720 #if LONG_MAX > SIZE_MAX
727 size_t BIO_ctrl_wpending(BIO *bio)
729 long ret = BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);
733 #if LONG_MAX > SIZE_MAX
740 /* put the 'bio' on the end of b's list of operators */
741 BIO *BIO_push(BIO *b, BIO *bio)
748 while (lb->next_bio != NULL)
753 /* called to do internal processing */
754 BIO_ctrl(b, BIO_CTRL_PUSH, 0, lb);
758 /* Remove the first and return the rest */
767 BIO_ctrl(b, BIO_CTRL_POP, 0, b);
769 if (b->prev_bio != NULL)
770 b->prev_bio->next_bio = b->next_bio;
771 if (b->next_bio != NULL)
772 b->next_bio->prev_bio = b->prev_bio;
779 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
785 if (!BIO_should_retry(b))
793 *reason = last->retry_reason;
797 int BIO_get_retry_reason(BIO *bio)
799 return bio->retry_reason;
802 void BIO_set_retry_reason(BIO *bio, int reason)
804 bio->retry_reason = reason;
807 BIO *BIO_find_type(BIO *bio, int type)
812 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
817 if (bio->method != NULL) {
818 mt = bio->method->type;
823 } else if (mt == type) {
828 } while (bio != NULL);
832 BIO *BIO_next(BIO *b)
839 void BIO_set_next(BIO *b, BIO *next)
844 void BIO_free_all(BIO *bio)
849 while (bio != NULL) {
854 /* Since ref count > 1, don't free anyone else. */
860 BIO *BIO_dup_chain(BIO *in)
862 BIO *ret = NULL, *eoc = NULL, *bio, *new_bio;
864 for (bio = in; bio != NULL; bio = bio->next_bio) {
865 if ((new_bio = BIO_new(bio->method)) == NULL)
867 #ifndef OPENSSL_NO_DEPRECATED_3_0
868 new_bio->callback = bio->callback;
870 new_bio->callback_ex = bio->callback_ex;
871 new_bio->cb_arg = bio->cb_arg;
872 new_bio->init = bio->init;
873 new_bio->shutdown = bio->shutdown;
874 new_bio->flags = bio->flags;
876 /* This will let SSL_s_sock() work with stdin/stdout */
877 new_bio->num = bio->num;
879 if (!BIO_dup_state(bio, (char *)new_bio)) {
885 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new_bio->ex_data,
895 BIO_push(eoc, new_bio);
906 void BIO_copy_next_retry(BIO *b)
908 BIO_set_flags(b, BIO_get_retry_flags(b->next_bio));
909 b->retry_reason = b->next_bio->retry_reason;
912 int BIO_set_ex_data(BIO *bio, int idx, void *data)
914 return CRYPTO_set_ex_data(&(bio->ex_data), idx, data);
917 void *BIO_get_ex_data(const BIO *bio, int idx)
919 return CRYPTO_get_ex_data(&(bio->ex_data), idx);
922 uint64_t BIO_number_read(BIO *bio)
925 return bio->num_read;
929 uint64_t BIO_number_written(BIO *bio)
932 return bio->num_write;
936 void bio_free_ex_data(BIO *bio)
938 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
941 void bio_cleanup(void)
943 #ifndef OPENSSL_NO_SOCK
944 bio_sock_cleanup_int();
945 CRYPTO_THREAD_lock_free(bio_lookup_lock);
946 bio_lookup_lock = NULL;
948 CRYPTO_THREAD_lock_free(bio_type_lock);
949 bio_type_lock = NULL;
952 /* Internal variant of the below BIO_wait() not calling ERR_raise(...) */
953 static int bio_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
955 #ifndef OPENSSL_NO_SOCK
960 if (max_time == 0) /* no timeout */
963 #ifndef OPENSSL_NO_SOCK
964 if (BIO_get_fd(bio, &fd) > 0 && fd < FD_SETSIZE)
965 return BIO_socket_wait(fd, BIO_should_read(bio), max_time);
967 /* fall back to polling since no sockets are available */
969 sec_diff = (long)(max_time - time(NULL)); /* might overflow */
971 return 0; /* clearly timeout */
973 /* now take a nap at most the given number of milliseconds */
974 if (sec_diff == 0) { /* we are below the 1 seconds resolution of max_time */
975 if (nap_milliseconds > 1000)
976 nap_milliseconds = 1000;
977 } else { /* for sec_diff > 0, take min(sec_diff * 1000, nap_milliseconds) */
978 if ((unsigned long)sec_diff * 1000 < nap_milliseconds)
979 nap_milliseconds = (unsigned int)sec_diff * 1000;
981 OSSL_sleep(nap_milliseconds);
986 * Wait on (typically socket-based) BIO at most until max_time.
987 * Succeed immediately if max_time == 0.
988 * If sockets are not available support polling: succeed after waiting at most
989 * the number of nap_milliseconds in order to avoid a tight busy loop.
990 * Call ERR_raise(ERR_LIB_BIO, ...) on timeout or error.
991 * Returns -1 on error, 0 on timeout, and 1 on success.
993 int BIO_wait(BIO *bio, time_t max_time, unsigned int nap_milliseconds)
995 int rv = bio_wait(bio, max_time, nap_milliseconds);
998 ERR_raise(ERR_LIB_BIO,
999 rv == 0 ? BIO_R_TRANSFER_TIMEOUT : BIO_R_TRANSFER_ERROR);
1004 * Connect via given BIO using BIO_do_connect() until success/timeout/error.
1005 * Parameter timeout == 0 means no timeout, < 0 means exactly one try.
1006 * For non-blocking and potentially even non-socket BIOs perform polling with
1007 * the given density: between polls sleep nap_milliseconds using BIO_wait()
1008 * in order to avoid a tight busy loop.
1009 * Returns -1 on error, 0 on timeout, and 1 on success.
1011 int BIO_do_connect_retry(BIO *bio, int timeout, int nap_milliseconds)
1013 int blocking = timeout <= 0;
1014 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
1018 ERR_raise(ERR_LIB_BIO, ERR_R_PASSED_NULL_PARAMETER);
1022 if (nap_milliseconds < 0)
1023 nap_milliseconds = 100;
1024 BIO_set_nbio(bio, !blocking);
1028 rv = BIO_do_connect(bio);
1030 if (rv <= 0) { /* could be timeout or retryable error or fatal error */
1031 int err = ERR_peek_last_error();
1032 int reason = ERR_GET_REASON(err);
1033 int do_retry = BIO_should_retry(bio); /* may be 1 only if !blocking */
1035 if (ERR_GET_LIB(err) == ERR_LIB_BIO) {
1039 * likely retryable system error occurred, which may be
1040 * EAGAIN (resource temporarily unavailable) some 40 secs after
1041 * calling getaddrinfo(): Temporary failure in name resolution
1042 * or a premature ETIMEDOUT, some 30 seconds after connect()
1044 case BIO_R_CONNECT_ERROR:
1045 case BIO_R_NBIO_CONNECT_ERROR:
1046 /* some likely retryable connection error occurred */
1047 (void)BIO_reset(bio); /* often needed to avoid retry failure */
1054 if (timeout >= 0 && do_retry) {
1056 /* will not actually wait if timeout == 0 (i.e., blocking BIO): */
1057 rv = bio_wait(bio, max_time, nap_milliseconds);
1060 ERR_raise(ERR_LIB_BIO,
1061 rv == 0 ? BIO_R_CONNECT_TIMEOUT : BIO_R_CONNECT_ERROR);
1063 ERR_clear_last_mark();
1065 if (err == 0) /* missing error queue entry */
1066 /* workaround: general error */
1067 ERR_raise(ERR_LIB_BIO, BIO_R_CONNECT_ERROR);
1070 ERR_clear_last_mark();