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=pod
=head1 NAME
SSL_SESSION_get0_hostname,
SSL_SESSION_set1_hostname,
SSL_SESSION_get0_alpn_selected,
SSL_SESSION_set1_alpn_selected
- get and set SNI and ALPN data ssociated with a session
=head1 SYNOPSIS
#include <openssl/ssl.h>
const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s);
int SSL_SESSION_set1_hostname(SSL_SESSION *s, const char *hostname);
void SSL_SESSION_get0_alpn_selected(const SSL_SESSION *s,
const unsigned char **alpn,
size_t *len);
int SSL_SESSION_set1_alpn_selected(SSL_SESSION *s, const unsigned char *alpn,
size_t len);
=head1 DESCRIPTION
SSL_SESSION_get0_hostname() retrieves the SNI value that was sent by the
client when the session was created, or NULL if no value was sent.
The value returned is a pointer to memory maintained within B<s> and
should not be free'd.
SSL_SESSION_set1_hostname() sets the SNI value for the hostname to a copy of
the string provided in hostname.
SSL_SESSION_get0_alpn_selected() retrieves the selected ALPN protocol for this
session and its associated length in bytes. The returned value of B<*alpn> is a
pointer to memory maintained within B<s> and should not be free'd.
SSL_SESSION_set1_alpn_selected() sets the ALPN protocol for this session to the
value in B<alpn> which should be of length B<len> bytes. A copy of the input
value is made, and the caller retains ownership of the memory pointed to by
B<alpn>.
=head1 RETURN VALUES
SSL_SESSION_get0_hostname() returns either a string or NULL based on if there
is the SNI value sent by client.
SSL_SESSION_set1_hostname() returns 1 on success or 0 on error.
SSL_SESSION_set1_alpn_selected() returns 1 on success or 0 on error.
=head1 SEE ALSO
L<ssl(7)>,
L<d2i_SSL_SESSION(3)>,
L<SSL_SESSION_get_time(3)>,
L<SSL_SESSION_free(3)>
=head1 HISTORY
The SSL_SESSION_set1_hostname(), SSL_SESSION_get0_alpn_selected() and
SSL_SESSION_set1_alpn_selected() functions were added in OpenSSL 1.1.1.
=head1 COPYRIGHT
Copyright 2016-2018 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
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