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=pod
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=head1 NAME
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SSL_set_num_tickets,
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SSL_get_num_tickets,
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SSL_CTX_set_num_tickets,
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SSL_CTX_get_num_tickets
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- control the number of TLSv1.3 session tickets that are issued
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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int SSL_set_num_tickets(SSL *s, size_t num_tickets);
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size_t SSL_get_num_tickets(SSL *s);
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int SSL_CTX_set_num_tickets(SSL_CTX *ctx, size_t num_tickets);
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size_t SSL_CTX_get_num_tickets(SSL_CTX *ctx);
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=head1 DESCRIPTION
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SSL_CTX_set_num_tickets() and SSL_set_num_tickets() can be called for a server
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application and set the number of TLSv1.3 session tickets that will be sent to
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the client after a full handshake. Set the desired value (which could be 0) in
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the B<num_tickets> argument. Typically these functions should be called before
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the start of the handshake.
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The default number of tickets is 2. Following a resumption the number of tickets
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issued will never be more than 1 regardless of the value set via
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SSL_set_num_tickets() or SSL_CTX_set_num_tickets(). If B<num_tickets> is set to
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0 then no tickets will be issued for either a normal connection or a resumption.
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Tickets are also issued on receipt of a post-handshake certificate from the
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client following a request by the server using
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L<SSL_verify_client_post_handshake(3)>. These new tickets will be associated
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with the updated client identity (i.e. including their certificate and
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verification status). The number of tickets issued will normally be the same as
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was used for the initial handshake. If the initial handshake was a full
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handshake then SSL_set_num_tickets() can be called again prior to calling
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SSL_verify_client_post_handshake() to update the number of tickets that will be
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sent.
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SSL_CTX_get_num_tickets() and SSL_get_num_tickets() return the number of
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tickets set by a previous call to SSL_CTX_set_num_tickets() or
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SSL_set_num_tickets(), or 2 if no such call has been made.
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=head1 RETURN VALUES
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SSL_CTX_set_num_tickets() and SSL_set_num_tickets() return 1 on success or 0 on
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failure.
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SSL_CTX_get_num_tickets() and SSL_get_num_tickets() return the number of tickets
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that have been previously set.
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=head1 HISTORY
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These functions were added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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