207 lines
6.2 KiB
Groff
207 lines
6.2 KiB
Groff
.\" $NetBSD: SSL_get_session.3,v 1.6 2002/08/09 16:15:43 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_get_session 3"
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.TH SSL_get_session 3 "0.9.6g" "2002-06-10" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_get_session \- retrieve \s-1TLS/SSL\s0 session data
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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 3
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\& SSL_SESSION *SSL_get_session(SSL *ssl);
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\& SSL_SESSION *SSL_get0_session(SSL *ssl);
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\& SSL_SESSION *SSL_get1_session(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_get_session()\fR returns a pointer to the \fB\s-1SSL_SESSION\s0\fR actually used in
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\&\fBssl\fR. The reference count of the \fB\s-1SSL_SESSION\s0\fR is not incremented, so
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that the pointer can become invalid by other operations.
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.PP
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\&\fISSL_get0_session()\fR is the same as \fISSL_get_session()\fR.
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.PP
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\&\fISSL_get1_session()\fR is the same as \fISSL_get_session()\fR, but the reference
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count of the \fB\s-1SSL_SESSION\s0\fR is incremented by one.
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.SH "NOTES"
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.IX Header "NOTES"
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The ssl session contains all information required to re-establish the
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connection without a new handshake.
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.PP
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\&\fISSL_get0_session()\fR returns a pointer to the actual session. As the
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reference counter is not incremented, the pointer is only valid while
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the connection is in use. If SSL_clear(3) or
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SSL_free(3) is called, the session may be removed completely
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(if considered bad), and the pointer obtained will become invalid. Even
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if the session is valid, it can be removed at any time due to timeout
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during SSL_CTX_flush_sessions(3).
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.PP
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If the data is to be kept, \fISSL_get1_session()\fR will increment the reference
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count, so that the session will not be implicitly removed by other operations
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but stays in memory. In order to remove the session
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SSL_SESSION_free(3) must be explicitly called once
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to decrement the reference count again.
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.PP
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\&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
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list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
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One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
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only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
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from this \s-1SSL_CTX\s0 object).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following return values can occur:
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.Ip "\s-1NULL\s0" 4
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.IX Item "NULL"
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There is no session available in \fBssl\fR.
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.Ip "Pointer to an \s-1SSL\s0" 4
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.IX Item "Pointer to an SSL"
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The return value points to the data of an \s-1SSL\s0 session.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3), SSL_free(3),
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SSL_clear(3),
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SSL_SESSION_free(3)
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