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e6b653535f
Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19703)
119 lines
3.9 KiB
Plaintext
119 lines
3.9 KiB
Plaintext
=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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nonblocking then the B<ssl> object will also have nonblocking 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() is similar to 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, and
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transfers the ownership of B<rbio> and B<wbio> to B<ssl> according to
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the following set of rules:
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=over 2
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=item *
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If neither the B<rbio> or B<wbio> have changed from their previous values
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then nothing is done.
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=item *
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If the B<rbio> and B<wbio> parameters are different and both are different
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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 B<rbio> and B<wbio> parameters are the same and the B<rbio> is not
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the same as the previously set value then one reference is consumed.
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=item *
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If the B<rbio> and B<wbio> parameters are the same and the B<rbio> is the
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same as the previously set value, then no additional references are consumed.
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=item *
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If the B<rbio> and B<wbio> parameters are different and the B<rbio> is the
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same as the
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previously set value then one reference is consumed for the B<wbio> and no
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references are consumed for the B<rbio>.
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=item *
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If the B<rbio> and B<wbio> parameters are different and the B<wbio> is the
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same as the previously set value and the old B<rbio> and B<wbio> values
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were the same as each other then one reference is consumed for the B<rbio>
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and no references are consumed for the B<wbio>.
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=item *
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If the B<rbio> and B<wbio> parameters are different and the B<wbio>
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is the same as the
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previously set value and the old B<rbio> and B<wbio> values were different
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to each other, then one reference is consumed for the B<rbio> and one
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reference is consumed for the B<wbio>.
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=back
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Because of this complexity, this function should be avoided;
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use SSL_set0_rbio() and SSL_set0_wbio() instead.
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Where a new BIO is set on a QUIC connection SSL object, blocking mode will be
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disabled on that SSL object if the BIO cannot support blocking mode. If another
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BIO is subsequently set on the SSL object which can support blocking mode,
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blocking mode will not be automatically re-enabled. For more information, see
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L<SSL_set_blocking_mode(3)>.
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=head1 RETURN VALUES
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SSL_set_bio(), SSL_set0_rbio() and SSL_set0_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 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (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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