2f61bc2ea3
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3117)
108 lines
3.6 KiB
Text
108 lines
3.6 KiB
Text
=pod
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=head1 NAME
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SSL_set_bio, SSL_set0_rbio, SSL_set0_wbio - connect the SSL object with a BIO
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);
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void SSL_set0_rbio(SSL *s, BIO *rbio);
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void SSL_set0_wbio(SSL *s, BIO *wbio);
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=head1 DESCRIPTION
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SSL_set0_rbio() connects the BIO B<rbio> for the read operations of the B<ssl>
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object. The SSL engine inherits the behaviour of B<rbio>. If the BIO is
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non-blocking then the B<ssl> object will also have non-blocking behaviour. This
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function transfers ownership of B<rbio> to B<ssl>. It will be automatically
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freed using L<BIO_free_all(3)> when the B<ssl> is freed. On calling this
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function, any existing B<rbio> that was previously set will also be freed via a
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call to L<BIO_free_all(3)> (this includes the case where the B<rbio> is set to
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the same value as previously).
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SSL_set0_wbio() works in the same as SSL_set0_rbio() except that it connects
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the BIO B<wbio> for the write operations of the B<ssl> object. Note that if the
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rbio and wbio are the same then SSL_set0_rbio() and SSL_set0_wbio() each take
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ownership of one reference. Therefore it may be necessary to increment the
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number of references available using L<BIO_up_ref(3)> before calling the set0
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functions.
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SSL_set_bio() does a similar job as SSL_set0_rbio() and SSL_set0_wbio() except
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that it connects both the B<rbio> and the B<wbio> at the same time. This
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function transfers the ownership of B<rbio> and B<wbio> to B<ssl> except that
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the rules for this are much more complex. For this reason this function is
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considered a legacy function and SSL_set0_rbio() and SSL_set0_wbio() should be
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used in preference. The ownership rules are as follows:
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=over 2
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=item *
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If neither the rbio or wbio have changed from their previous values then nothing
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is done.
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=item *
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If the rbio and wbio parameters are different and both are different to their
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previously set values then one reference is consumed for the rbio and one
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reference is consumed for the wbio.
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=item *
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If the rbio and wbio parameters are the same and the rbio is not the same as the
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previously set value then one reference is consumed.
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=item *
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If the rbio and wbio parameters are the same and the rbio is the same as the
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previously set value, then no additional references are consumed.
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=item *
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If the rbio and wbio parameters are different and the rbio is the same as the
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previously set value then one reference is consumed for the wbio and no
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references are consumed for the rbio.
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=item *
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If the rbio and wbio parameters are different and the wbio is the same as the
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previously set value and the old rbio and wbio values were the same as each
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other then one reference is consumed for the rbio and no references are consumed
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for the wbio.
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=item *
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If the rbio and wbio parameters are different and the wbio is the same as the
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previously set value and the old rbio and wbio values were different to each
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other then one reference is consumed for the rbio and one reference is consumed
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for the wbio.
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=back
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=head1 RETURN VALUES
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SSL_set_bio(), SSL_set_rbio() and SSL_set_wbio() cannot fail.
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=head1 SEE ALSO
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L<SSL_get_rbio(3)>,
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L<SSL_connect(3)>, L<SSL_accept(3)>,
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L<SSL_shutdown(3)>, L<ssl(7)>, L<bio(7)>
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=head1 HISTORY
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SSL_set0_rbio() and SSL_set0_wbio() were added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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