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

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);

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 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 *alpn is a pointer to memory
       maintained within s and should not be free'd.

       SSL_SESSION_set1_alpn_selected() sets the ALPN protocol for this session to the value in
       alpn which should be of length len bytes. A copy of the input value is made, and the
       caller retains ownership of the memory pointed to by alpn.

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.

SEE ALSO

       ssl(7), d2i_SSL_SESSION(3), SSL_SESSION_get_time(3), SSL_SESSION_free(3)

HISTORY

       SSL_SESSION_set1_hostname(), SSL_SESSION_get0_alpn_selected() and
       SSL_SESSION_set1_alpn_selected() were added in OpenSSL 1.1.1.

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 <https://www.openssl.org/source/license.html>.