=pod =head1 NAME SSL_SESSION_new, SSL_SESSION_dup, SSL_SESSION_up_ref, SSL_SESSION_free - create, free and manage SSL_SESSION structures =head1 SYNOPSIS #include SSL_SESSION *SSL_SESSION_new(void); SSL_SESSION *SSL_SESSION_dup(const SSL_SESSION *src); int SSL_SESSION_up_ref(SSL_SESSION *ses); void SSL_SESSION_free(SSL_SESSION *session); =head1 DESCRIPTION SSL_SESSION_new() creates a new SSL_SESSION structure and returns a pointer to it. SSL_SESSION_dup() copies the contents of the SSL_SESSION structure in B and returns a pointer to it. SSL_SESSION_up_ref() increments the reference count on the given SSL_SESSION structure. SSL_SESSION_free() decrements the reference count of B and removes the B structure pointed to by B and frees up the allocated memory, if the reference count has reached 0. If B is NULL nothing is done. =head1 NOTES SSL_SESSION objects are allocated, when a TLS/SSL handshake operation is successfully completed. Depending on the settings, see L, the SSL_SESSION objects are internally referenced by the SSL_CTX and linked into its session cache. SSL objects may be using the SSL_SESSION object; as a session may be reused, several SSL objects may be using one SSL_SESSION object at the same time. It is therefore crucial to keep the reference count (usage information) correct and not delete a SSL_SESSION object that is still used, as this may lead to program failures due to dangling pointers. These failures may also appear delayed, e.g. when an SSL_SESSION object was completely freed as the reference count incorrectly became 0, but it is still referenced in the internal session cache and the cache list is processed during a L operation. SSL_SESSION_free() must only be called for SSL_SESSION objects, for which the reference count was explicitly incremented (e.g. by calling SSL_get1_session(), see L) or when the SSL_SESSION object was generated outside a TLS handshake operation, e.g. by using L. It must not be called on other SSL_SESSION objects, as this would cause incorrect reference counts and therefore program failures. =head1 RETURN VALUES SSL_SESSION_new returns a pointer to the newly allocated SSL_SESSION structure or NULL on error. SSL_SESSION_up_ref returns 1 on success or 0 on error. =head1 SEE ALSO L, L, L, L, L =head1 HISTORY The SSL_SESSION_dup() function was added in OpenSSL 1.1.1. =head1 COPYRIGHT Copyright 2000-2016 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