SSL_dup, SSL_new, SSL_up_ref - create an SSL structure for a connection
#include <openssl/ssl.h>
SSL *SSL_dup(SSL *s); SSL *SSL_new(SSL_CTX *ctx); int SSL_up_ref(SSL *s);
SSL_new()
creates a new SSL structure which is needed to hold the
data for a TLS/SSL connection. The new structure inherits the settings
of the underlying context ctx: connection method,
options, verification settings, timeout settings. An SSL structure is
reference counted. Creating an SSL structure for the first time increments
the reference count. Freeing it (using SSL_free) decrements it. When the
reference count drops to zero, any memory or resources allocated to the SSL
structure are freed.
SSL_up_ref()
increments the reference count for an
existing SSL structure.
The function SSL_dup()
creates and returns a new SSL structure from the same
SSL_CTX that was used to create s. It additionally duplicates a subset of
the settings in s into the new SSL object.
For SSL_dup()
to work, the connection MUST be in its initial state and
MUST NOT have yet started the SSL handshake. For connections that are not in
their initial state SSL_dup()
just increments an internal
reference count and returns the same handle. It may be possible to
use SSL_clear(3) to recycle an SSL handle that is not in its initial
state for re-use, but this is best avoided. Instead, save and restore
the session, if desired, and construct a fresh handle for each connection.
The subset of settings in s that are duplicated are:
The following return values can occur:
The creation of a new SSL structure failed. Check the error stack to find out the reason.
The return value points to an allocated SSL structure.
SSL_up_ref()
returns 1 for success and 0 for failure.
SSL_free(3), SSL_clear(3), SSL_CTX_set_options(3), SSL_get_SSL_CTX(3), ssl(7)
Copyright 2000-2020 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.