210 lines
6.3 KiB
Groff
210 lines
6.3 KiB
Groff
.\" $NetBSD: SSL_CTX_add_session.3,v 1.9 2004/03/20 21:48:46 groo Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_CTX_add_session 3"
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.TH SSL_CTX_add_session 3 "0.9.7d" "2003-09-24" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_CTX_add_session, SSL_add_session, SSL_CTX_remove_session, SSL_remove_session \- manipulate session cache
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 2
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\& int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c);
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\& int SSL_add_session(SSL_CTX *ctx, SSL_SESSION *c);
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.Ve
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.Vb 2
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\& int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c);
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\& int SSL_remove_session(SSL_CTX *ctx, SSL_SESSION *c);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_CTX_add_session()\fR adds the session \fBc\fR to the context \fBctx\fR. The
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reference count for session \fBc\fR is incremented by 1. If a session with
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the same session id already exists, the old session is removed by calling
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SSL_SESSION_free(3).
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.PP
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\&\fISSL_CTX_remove_session()\fR removes the session \fBc\fR from the context \fBctx\fR.
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SSL_SESSION_free(3) is called once for \fBc\fR.
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.PP
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\&\fISSL_add_session()\fR and \fISSL_remove_session()\fR are synonyms for their
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SSL_CTX_*() counterparts.
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.SH "NOTES"
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.IX Header "NOTES"
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When adding a new session to the internal session cache, it is examined
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whether a session with the same session id already exists. In this case
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it is assumed that both sessions are identical. If the same session is
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stored in a different \s-1SSL_SESSION\s0 object, The old session is
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removed and replaced by the new session. If the session is actually
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identical (the \s-1SSL_SESSION\s0 object is identical), \fISSL_CTX_add_session()\fR
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is a no-op, and the return value is 0.
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.PP
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If a server \s-1SSL_CTX\s0 is configured with the \s-1SSL_SESS_CACHE_NO_INTERNAL_STORE\s0
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flag then the internal cache will not be populated automatically by new
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sessions negotiated by the \s-1SSL/TLS\s0 implementation, even though the internal
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cache will be searched automatically for session-resume requests (the
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latter can be surpressed by \s-1SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\s0). So the
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application can use \fISSL_CTX_add_session()\fR directly to have full control
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over the sessions that can be resumed if desired.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following values are returned by all functions:
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.Ip "0" 4
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.Vb 3
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\& The operation failed. In case of the add operation, it was tried to add
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\& the same (identical) session twice. In case of the remove operation, the
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\& session was not found in the cache.
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.Ve
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.Ip "1" 4
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.IX Item "1"
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.Vb 1
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\& The operation succeeded.
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3),
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SSL_CTX_set_session_cache_mode(3),
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SSL_SESSION_free(3)
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