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129 .\" ========================================================================
131 .IX Title "SSL_get_error 3"
132 .TH SSL_get_error 3 "2017-11-02" "1.0.2m" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 SSL_get_error \- obtain result code for TLS/SSL I/O operation
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ssl.h>
144 \& int SSL_get_error(const SSL *ssl, int ret);
147 .IX Header "DESCRIPTION"
148 \&\fISSL_get_error()\fR returns a result code (suitable for the C \*(L"switch\*(R"
149 statement) for a preceding call to \fISSL_connect()\fR, \fISSL_accept()\fR, \fISSL_do_handshake()\fR,
150 \&\fISSL_read()\fR, \fISSL_peek()\fR, or \fISSL_write()\fR on \fBssl\fR. The value returned by
151 that \s-1TLS/SSL I/O\s0 function must be passed to \fISSL_get_error()\fR in parameter
154 In addition to \fBssl\fR and \fBret\fR, \fISSL_get_error()\fR inspects the
155 current thread's OpenSSL error queue. Thus, \fISSL_get_error()\fR must be
156 used in the same thread that performed the \s-1TLS/SSL I/O\s0 operation, and no
157 other OpenSSL function calls should appear in between. The current
158 thread's error queue must be empty before the \s-1TLS/SSL I/O\s0 operation is
159 attempted, or \fISSL_get_error()\fR will not work reliably.
161 .IX Header "RETURN VALUES"
162 The following return values can currently occur:
163 .IP "\s-1SSL_ERROR_NONE\s0" 4
164 .IX Item "SSL_ERROR_NONE"
165 The \s-1TLS/SSL I/O\s0 operation completed. This result code is returned
166 if and only if \fBret > 0\fR.
167 .IP "\s-1SSL_ERROR_ZERO_RETURN\s0" 4
168 .IX Item "SSL_ERROR_ZERO_RETURN"
169 The \s-1TLS/SSL\s0 connection has been closed.
170 If the protocol version is \s-1SSL 3.0\s0 or higher, this result code is returned only
171 if a closure alert has occurred in the protocol, i.e. if the connection has been
173 Note that in this case \fB\s-1SSL_ERROR_ZERO_RETURN\s0\fR does not necessarily
174 indicate that the underlying transport has been closed.
175 .IP "\s-1SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE\s0" 4
176 .IX Item "SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE"
177 The operation did not complete; the same \s-1TLS/SSL I/O\s0 function should be
178 called again later. If, by then, the underlying \fB\s-1BIO\s0\fR has data
179 available for reading (if the result code is \fB\s-1SSL_ERROR_WANT_READ\s0\fR)
180 or allows writing data (\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR), then some \s-1TLS/SSL\s0
181 protocol progress will take place, i.e. at least part of an \s-1TLS/SSL\s0
182 record will be read or written. Note that the retry may again lead to
183 a \fB\s-1SSL_ERROR_WANT_READ\s0\fR or \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR condition.
184 There is no fixed upper limit for the number of iterations that
185 may be necessary until progress becomes visible at application
188 For socket \fB\s-1BIO\s0\fRs (e.g. when \fISSL_set_fd()\fR was used), \fIselect()\fR or
189 \&\fIpoll()\fR on the underlying socket can be used to find out when the
190 \&\s-1TLS/SSL I/O\s0 function should be retried.
192 Caveat: Any \s-1TLS/SSL I/O\s0 function can lead to either of
193 \&\fB\s-1SSL_ERROR_WANT_READ\s0\fR and \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. In particular,
194 \&\fISSL_read()\fR or \fISSL_peek()\fR may want to write data and \fISSL_write()\fR may want
195 to read data. This is mainly because \s-1TLS/SSL\s0 handshakes may occur at any
196 time during the protocol (initiated by either the client or the server);
197 \&\fISSL_read()\fR, \fISSL_peek()\fR, and \fISSL_write()\fR will handle any pending handshakes.
198 .IP "\s-1SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT\s0" 4
199 .IX Item "SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT"
200 The operation did not complete; the same \s-1TLS/SSL I/O\s0 function should be
201 called again later. The underlying \s-1BIO\s0 was not connected yet to the peer
202 and the call would block in \fIconnect()\fR/\fIaccept()\fR. The \s-1SSL\s0 function should be
203 called again when the connection is established. These messages can only
204 appear with a \fIBIO_s_connect()\fR or \fIBIO_s_accept()\fR \s-1BIO,\s0 respectively.
205 In order to find out, when the connection has been successfully established,
206 on many platforms \fIselect()\fR or \fIpoll()\fR for writing on the socket file descriptor
208 .IP "\s-1SSL_ERROR_WANT_X509_LOOKUP\s0" 4
209 .IX Item "SSL_ERROR_WANT_X509_LOOKUP"
210 The operation did not complete because an application callback set by
211 \&\fISSL_CTX_set_client_cert_cb()\fR has asked to be called again.
212 The \s-1TLS/SSL I/O\s0 function should be called again later.
213 Details depend on the application.
214 .IP "\s-1SSL_ERROR_SYSCALL\s0" 4
215 .IX Item "SSL_ERROR_SYSCALL"
216 Some non-recoverable I/O error occurred.
217 The OpenSSL error queue may contain more information on the error.
218 For socket I/O on Unix systems, consult \fBerrno\fR for details.
219 .IP "\s-1SSL_ERROR_SSL\s0" 4
220 .IX Item "SSL_ERROR_SSL"
221 A failure in the \s-1SSL\s0 library occurred, usually a protocol error. The
222 OpenSSL error queue contains more information on the error.
224 .IX Header "SEE ALSO"
225 \&\fIssl\fR\|(3), \fIerr\fR\|(3)
228 \&\fISSL_get_error()\fR was added in SSLeay 0.8.