1SSL_SET_BIO(3)                      OpenSSL                     SSL_SET_BIO(3)
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NAME

6       SSL_set_bio, SSL_set0_rbio, SSL_set0_wbio - connect the SSL object with
7       a BIO
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SYNOPSIS

10        #include <openssl/ssl.h>
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12        void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);
13        void SSL_set0_rbio(SSL *s, BIO *rbio);
14        void SSL_set0_wbio(SSL *s, BIO *wbio);
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DESCRIPTION

17       SSL_set0_rbio() connects the BIO rbio for the read operations of the
18       ssl object. The SSL engine inherits the behaviour of rbio. If the BIO
19       is nonblocking then the ssl object will also have nonblocking
20       behaviour. This function transfers ownership of rbio to ssl. It will be
21       automatically freed using BIO_free_all(3) when the ssl is freed. On
22       calling this function, any existing rbio that was previously set will
23       also be freed via a call to BIO_free_all(3) (this includes the case
24       where the rbio is set to the same value as previously).
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26       SSL_set0_wbio() works in the same as SSL_set0_rbio() except that it
27       connects the BIO wbio for the write operations of the ssl object. Note
28       that if the rbio and wbio are the same then SSL_set0_rbio() and
29       SSL_set0_wbio() each take ownership of one reference. Therefore, it may
30       be necessary to increment the number of references available using
31       BIO_up_ref(3) before calling the set0 functions.
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33       SSL_set_bio() is similar to SSL_set0_rbio() and SSL_set0_wbio() except
34       that it connects both the rbio and the wbio at the same time, and
35       transfers the ownership of rbio and wbio to ssl according to the
36       following set of rules:
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38       • If neither the rbio or wbio have changed from their previous values
39         then nothing is done.
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41       • If the rbio and wbio parameters are different and both are different
42         to their previously set values then one reference is consumed for the
43         rbio and one reference is consumed for the wbio.
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45       • If the rbio and wbio parameters are the same and the rbio is not the
46         same as the previously set value then one reference is consumed.
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48       • If the rbio and wbio parameters are the same and the rbio is the same
49         as the previously set value, then no additional references are
50         consumed.
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52       • If the rbio and wbio parameters are different and the rbio is the
53         same as the previously set value then one reference is consumed for
54         the wbio and no references are consumed for the rbio.
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56       • If the rbio and wbio parameters are different and the wbio is the
57         same as the previously set value and the old rbio and wbio values
58         were the same as each other then one reference is consumed for the
59         rbio and no references are consumed for the wbio.
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61       • If the rbio and wbio parameters are different and the wbio is the
62         same as the previously set value and the old rbio and wbio values
63         were different to each other then one reference is consumed for the
64         rbio and one reference is consumed for the wbio.
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66       Because of this complexity, this function should be avoided; use
67       SSL_set0_rbio() and SSL_set0_wbio() instead.
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RETURN VALUES

70       SSL_set_bio(), SSL_set0_rbio() and SSL_set0_wbio() cannot fail.
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SEE ALSO

73       SSL_get_rbio(3), SSL_connect(3), SSL_accept(3), SSL_shutdown(3),
74       ssl(7), bio(7)
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HISTORY

77       SSL_set0_rbio() and SSL_set0_wbio() were added in OpenSSL 1.1.0.
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80       Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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82       Licensed under the OpenSSL license (the "License").  You may not use
83       this file except in compliance with the License.  You can obtain a copy
84       in the file LICENSE in the source distribution or at
85       <https://www.openssl.org/source/license.html>.
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891.1.1i                            2021-07-22                    SSL_SET_BIO(3)
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