SSL_set_bio.pod
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=pod
=head1 NAME
SSL_set_bio, SSL_set0_rbio, SSL_set0_wbio - connect the SSL object with a BIO
=head1 SYNOPSIS
#include <openssl/ssl.h>
void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);
void SSL_set0_rbio(SSL *s, BIO *rbio);
void SSL_set0_wbio(SSL *s, BIO *wbio);
=head1 DESCRIPTION
SSL_set0_rbio() connects the BIO B<rbio> for the read operations of the B<ssl>
object. The SSL engine inherits the behaviour of B<rbio>. If the BIO is
non-blocking then the B<ssl> object will also have non-blocking behaviour. This
function transfers ownership of B<rbio> to B<ssl>. It will be automatically
freed using L<BIO_free_all(3)> when the B<ssl> is freed. On calling this
function, any existing B<rbio> that was previously set will also be freed via a
call to L<BIO_free_all(3)> (this includes the case where the B<rbio> is set to
the same value as previously).
SSL_set0_wbio() works in the same as SSL_set0_rbio() except that it connects
the BIO B<wbio> for the write operations of the B<ssl> object. Note that if the
rbio and wbio are the same then SSL_set0_rbio() and SSL_set0_wbio() each take
ownership of one reference. Therefore it may be necessary to increment the
number of references available using L<BIO_up_ref(3)> before calling the set0
functions.
SSL_set_bio() is similar to SSL_set0_rbio() and SSL_set0_wbio() except
that it connects both the B<rbio> and the B<wbio> at the same time, and
transfers the ownership of B<rbio> and B<wbio> to B<ssl> according to
the following set of rules:
=over 2
=item *
If neither the B<rbio> or B<wbio> have changed from their previous values
then nothing is done.
=item *
If the B<rbio> and B<wbio> parameters are different and both are different
to their
previously set values then one reference is consumed for the rbio and one
reference is consumed for the wbio.
=item *
If the B<rbio> and B<wbio> parameters are the same and the B<rbio> is not
the same as the previously set value then one reference is consumed.
=item *
If the B<rbio> and B<wbio> parameters are the same and the B<rbio> is the
same as the previously set value, then no additional references are consumed.
=item *
If the B<rbio> and B<wbio> parameters are different and the B<rbio> is the
same as the
previously set value then one reference is consumed for the B<wbio> and no
references are consumed for the B<rbio>.
=item *
If the B<rbio> and B<wbio> parameters are different and the B<wbio> is the
same as the previously set value and the old B<rbio> and B<wbio> values
were the same as each other then one reference is consumed for the B<rbio>
and no references are consumed for the B<wbio>.
=item *
If the B<rbio> and B<wbio> parameters are different and the B<wbio>
is the same as the
previously set value and the old B<rbio> and B<wbio> values were different
to each
other then one reference is consumed for the B<rbio> and one reference
is consumed
for the B<wbio>.
=back
Because of this complexity, this function should be avoided;
use SSL_set0_rbio() and SSL_set0_wbio() instead.
=head1 RETURN VALUES
SSL_set_bio(), SSL_set0_rbio() and SSL_set0_wbio() cannot fail.
=head1 SEE ALSO
L<SSL_get_rbio(3)>,
L<SSL_connect(3)>, L<SSL_accept(3)>,
L<SSL_shutdown(3)>, L<ssl(7)>, L<bio(7)>
=head1 HISTORY
SSL_set0_rbio() and SSL_set0_wbio() were added in OpenSSL 1.1.0.
=head1 COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut