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134 .\" ========================================================================
136 .IX Title "SSL_get_session 3"
137 .TH SSL_get_session 3 "2005-03-30" "1.1.0-dev" "OpenSSL"
138 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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143 SSL_get_session \- retrieve TLS/SSL session data
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/ssl.h>
151 \& SSL_SESSION *SSL_get_session(const SSL *ssl);
152 \& SSL_SESSION *SSL_get0_session(const SSL *ssl);
153 \& SSL_SESSION *SSL_get1_session(SSL *ssl);
156 .IX Header "DESCRIPTION"
157 \&\fISSL_get_session()\fR returns a pointer to the \fB\s-1SSL_SESSION\s0\fR actually used in
158 \&\fBssl\fR. The reference count of the \fB\s-1SSL_SESSION\s0\fR is not incremented, so
159 that the pointer can become invalid by other operations.
161 \&\fISSL_get0_session()\fR is the same as \fISSL_get_session()\fR.
163 \&\fISSL_get1_session()\fR is the same as \fISSL_get_session()\fR, but the reference
164 count of the \fB\s-1SSL_SESSION\s0\fR is incremented by one.
167 The ssl session contains all information required to re-establish the
168 connection without a new handshake.
170 \&\fISSL_get0_session()\fR returns a pointer to the actual session. As the
171 reference counter is not incremented, the pointer is only valid while
172 the connection is in use. If \fISSL_clear\fR\|(3) or
173 \&\fISSL_free\fR\|(3) is called, the session may be removed completely
174 (if considered bad), and the pointer obtained will become invalid. Even
175 if the session is valid, it can be removed at any time due to timeout
176 during \fISSL_CTX_flush_sessions\fR\|(3).
178 If the data is to be kept, \fISSL_get1_session()\fR will increment the reference
179 count, so that the session will not be implicitly removed by other operations
180 but stays in memory. In order to remove the session
181 \&\fISSL_SESSION_free\fR\|(3) must be explicitly called once
182 to decrement the reference count again.
184 \&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
185 list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
186 One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
187 only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
188 from this \s-1SSL_CTX\s0 object).
190 .IX Header "RETURN VALUES"
191 The following return values can occur:
194 There is no session available in \fBssl\fR.
195 .IP "Pointer to an \s-1SSL\s0" 4
196 .IX Item "Pointer to an SSL"
197 The return value points to the data of an \s-1SSL\s0 session.
199 .IX Header "SEE ALSO"
200 \&\fIssl\fR\|(3), \fISSL_free\fR\|(3),
201 \&\fISSL_clear\fR\|(3),
202 \&\fISSL_SESSION_free\fR\|(3)