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SSL_NEW(3)                          OpenSSL                         SSL_NEW(3)
NAME
       SSL_dup, SSL_new, SSL_up_ref - create an SSL structure for a connection
SYNOPSIS
        #include <openssl/ssl.h>
        SSL *SSL_dup(SSL *s);
        SSL *SSL_new(SSL_CTX *ctx);
        int SSL_up_ref(SSL *s);
DESCRIPTION
       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:
       any session data if configured (including the session_id_context)
       any tmp_dh settings set via SSL_set_tmp_dh(3),
       SSL_set_tmp_dh_callback(3), or SSL_set_dh_auto(3)
       any configured certificates, private keys or certificate chains
       any configured signature algorithms, or client signature algorithms
       any DANE settings
       any Options set via SSL_set_options(3)
       any Mode set via SSL_set_mode(3)
       any minimum or maximum protocol settings set via
       SSL_set_min_proto_version(3) or SSL_set_max_proto_version(3) (Note:
       Only from OpenSSL 1.1.1h and above)
       any Verify mode, callback or depth set via SSL_set_verify(3) or
       SSL_set_verify_depth(3) or any configured X509 verification parameters
       any msg callback or info callback set via SSL_set_msg_callback(3) or
       SSL_set_info_callback(3)
       any default password callback set via SSL_set_default_passwd_cb(3)
       any session id generation callback set via
       SSL_set_generate_session_id(3)
       any configured Cipher List
       initial accept (server) or connect (client) state
       the max cert list value set via SSL_set_max_cert_list(3)
       the read_ahead value set via SSL_set_read_ahead(3)
       application specific data set via SSL_set_ex_data(3)
       any CA list or client CA list set via SSL_set0_CA_list(3),
       SSL_set0_client_CA_list() or similar functions
       any security level settings or callbacks
       any configured serverinfo data
       any configured PSK identity hint
       any configured custom extensions
       any client certificate types configured via
       SSL_set1_client_certificate_types
RETURN VALUES
       The following return values can occur:
       NULL
           The creation of a new SSL structure failed. Check the error stack
           to find out the reason.
       Pointer to an SSL structure
           The return value points to an allocated SSL structure.
           SSL_up_ref() returns 1 for success and 0 for failure.
SEE ALSO
       SSL_free(3), SSL_clear(3), SSL_CTX_set_options(3), SSL_get_SSL_CTX(3),
       ssl(7)
COPYRIGHT
       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>;.
1.1.1k                            2021-03-25                        SSL_NEW(3)