xref: /openssl/doc/man3/SSL_CTX_add_session.pod (revision 4746f25a)
1=pod
2
3=head1 NAME
4
5SSL_CTX_add_session, SSL_CTX_remove_session - manipulate session cache
6
7=head1 SYNOPSIS
8
9 #include <openssl/ssl.h>
10
11 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c);
12
13 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c);
14
15=head1 DESCRIPTION
16
17SSL_CTX_add_session() adds the session B<c> to the context B<ctx>. The
18reference count for session B<c> is incremented by 1. If a session with
19the same session id already exists, the old session is removed by calling
20L<SSL_SESSION_free(3)>.
21
22SSL_CTX_remove_session() removes the session B<c> from the context B<ctx> and
23marks it as non-resumable. L<SSL_SESSION_free(3)> is called once for B<c>.
24
25=head1 NOTES
26
27When adding a new session to the internal session cache, it is examined
28whether a session with the same session id already exists. In this case
29it is assumed that both sessions are identical. If the same session is
30stored in a different SSL_SESSION object, The old session is
31removed and replaced by the new session. If the session is actually
32identical (the SSL_SESSION object is identical), SSL_CTX_add_session()
33is a no-op, and the return value is 0.
34
35If a server SSL_CTX is configured with the SSL_SESS_CACHE_NO_INTERNAL_STORE
36flag then the internal cache will not be populated automatically by new
37sessions negotiated by the SSL/TLS implementation, even though the internal
38cache will be searched automatically for session-resume requests (the
39latter can be suppressed by SSL_SESS_CACHE_NO_INTERNAL_LOOKUP). So the
40application can use SSL_CTX_add_session() directly to have full control
41over the sessions that can be resumed if desired.
42
43
44=head1 RETURN VALUES
45
46The following values are returned by all functions:
47
48=over 4
49
50=item Z<>0
51
52The operation failed. In case of the add operation, it was tried to add
53the same (identical) session twice. In case of the remove operation, the
54session was not found in the cache.
55
56=item Z<>1
57
58The operation succeeded.
59
60=back
61
62=head1 SEE ALSO
63
64L<ssl(7)>,
65L<SSL_CTX_set_session_cache_mode(3)>,
66L<SSL_SESSION_free(3)>
67
68=head1 COPYRIGHT
69
70Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
71
72Licensed under the Apache License 2.0 (the "License").  You may not use
73this file except in compliance with the License.  You can obtain a copy
74in the file LICENSE in the source distribution or at
75L<https://www.openssl.org/source/license.html>.
76
77=cut
78