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133 .\" ========================================================================
135 .IX Title "SSL_get_session 3"
136 .TH SSL_get_session 3 "2016-09-26" "1.0.2j" "OpenSSL"
137 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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142 SSL_get_session \- retrieve TLS/SSL session data
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/ssl.h>
148 \& SSL_SESSION *SSL_get_session(const SSL *ssl);
149 \& SSL_SESSION *SSL_get0_session(const SSL *ssl);
150 \& SSL_SESSION *SSL_get1_session(SSL *ssl);
153 .IX Header "DESCRIPTION"
154 \&\fISSL_get_session()\fR returns a pointer to the \fB\s-1SSL_SESSION\s0\fR actually used in
155 \&\fBssl\fR. The reference count of the \fB\s-1SSL_SESSION\s0\fR is not incremented, so
156 that the pointer can become invalid by other operations.
158 \&\fISSL_get0_session()\fR is the same as \fISSL_get_session()\fR.
160 \&\fISSL_get1_session()\fR is the same as \fISSL_get_session()\fR, but the reference
161 count of the \fB\s-1SSL_SESSION\s0\fR is incremented by one.
164 The ssl session contains all information required to re-establish the
165 connection without a new handshake.
167 \&\fISSL_get0_session()\fR returns a pointer to the actual session. As the
168 reference counter is not incremented, the pointer is only valid while
169 the connection is in use. If \fISSL_clear\fR\|(3) or
170 \&\fISSL_free\fR\|(3) is called, the session may be removed completely
171 (if considered bad), and the pointer obtained will become invalid. Even
172 if the session is valid, it can be removed at any time due to timeout
173 during \fISSL_CTX_flush_sessions\fR\|(3).
175 If the data is to be kept, \fISSL_get1_session()\fR will increment the reference
176 count, so that the session will not be implicitly removed by other operations
177 but stays in memory. In order to remove the session
178 \&\fISSL_SESSION_free\fR\|(3) must be explicitly called once
179 to decrement the reference count again.
181 \&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
182 list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
183 One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
184 only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
185 from this \s-1SSL_CTX\s0 object).
187 .IX Header "RETURN VALUES"
188 The following return values can occur:
191 There is no session available in \fBssl\fR.
192 .IP "Pointer to an \s-1SSL\s0" 4
193 .IX Item "Pointer to an SSL"
194 The return value points to the data of an \s-1SSL\s0 session.
196 .IX Header "SEE ALSO"
197 \&\fIssl\fR\|(3), \fISSL_free\fR\|(3),
198 \&\fISSL_clear\fR\|(3),
199 \&\fISSL_SESSION_free\fR\|(3)