1 .\" $NetBSD: SSL_get_session.3,v 1.14 2015/06/12 17:01:14 christos Exp $
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135 .\" ========================================================================
137 .IX Title "SSL_get_session 3"
138 .TH SSL_get_session 3 "2009-07-19" "1.0.1n" "OpenSSL"
139 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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144 SSL_get_session \- retrieve TLS/SSL session data
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/ssl.h>
152 \& SSL_SESSION *SSL_get_session(const SSL *ssl);
153 \& SSL_SESSION *SSL_get0_session(const SSL *ssl);
154 \& SSL_SESSION *SSL_get1_session(SSL *ssl);
157 .IX Header "DESCRIPTION"
158 \&\fISSL_get_session()\fR returns a pointer to the \fB\s-1SSL_SESSION\s0\fR actually used in
159 \&\fBssl\fR. The reference count of the \fB\s-1SSL_SESSION\s0\fR is not incremented, so
160 that the pointer can become invalid by other operations.
162 \&\fISSL_get0_session()\fR is the same as \fISSL_get_session()\fR.
164 \&\fISSL_get1_session()\fR is the same as \fISSL_get_session()\fR, but the reference
165 count of the \fB\s-1SSL_SESSION\s0\fR is incremented by one.
168 The ssl session contains all information required to re-establish the
169 connection without a new handshake.
171 \&\fISSL_get0_session()\fR returns a pointer to the actual session. As the
172 reference counter is not incremented, the pointer is only valid while
173 the connection is in use. If \fISSL_clear\fR\|(3) or
174 \&\fISSL_free\fR\|(3) is called, the session may be removed completely
175 (if considered bad), and the pointer obtained will become invalid. Even
176 if the session is valid, it can be removed at any time due to timeout
177 during \fISSL_CTX_flush_sessions\fR\|(3).
179 If the data is to be kept, \fISSL_get1_session()\fR will increment the reference
180 count, so that the session will not be implicitly removed by other operations
181 but stays in memory. In order to remove the session
182 \&\fISSL_SESSION_free\fR\|(3) must be explicitly called once
183 to decrement the reference count again.
185 \&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
186 list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
187 One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
188 only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
189 from this \s-1SSL_CTX\s0 object).
191 .IX Header "RETURN VALUES"
192 The following return values can occur:
195 There is no session available in \fBssl\fR.
196 .IP "Pointer to an \s-1SSL\s0" 4
197 .IX Item "Pointer to an SSL"
198 The return value points to the data of an \s-1SSL\s0 session.
200 .IX Header "SEE ALSO"
201 \&\fIssl\fR\|(3), \fISSL_free\fR\|(3),
202 \&\fISSL_clear\fR\|(3),
203 \&\fISSL_SESSION_free\fR\|(3)