=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 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 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 and should not be free'd. SSL_SESSION_set1_alpn_selected() sets the ALPN protocol for this session to the value in B which should be of length B bytes. A copy of the input value is made, and the caller retains ownership of the memory pointed to by B. =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, L, L, L =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 Apache License 2.0 (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. =cut