SSL_SESSION_get_id, SSL_SESSION_set1_id - get and set the SSL session ID

       Copyright 2015-2020 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
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                          SSL_SESSION_SET1_ID(3SSL)

SSL_SESSION_get_id() returns a pointer to the internal session id value for the session s. The length of
       the id in bytes is stored in *len. The length may be 0. The caller should not free the returned pointer
       directly.

       SSL_SESSION_set1_id() sets the session ID for the ssl SSL/TLS session to sid of length sid_len.

       The SSL_SESSION_set1_id() function was added in OpenSSL 1.1.0.

       SSL_SESSION_get_id, SSL_SESSION_set1_id - get and set the SSL session ID

SSL_SESSION_get_id() returns a pointer to the session id value.  SSL_SESSION_set1_id() returns 1 for
       success and 0 for failure, for example if the supplied session ID length exceeds
       SSL_MAX_SSL_SESSION_ID_LENGTH.

ssl(7)

        #include <openssl/ssl.h>

        const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s,
                                                unsigned int *len);
        int SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
                                unsigned int sid_len);