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124 .\" ========================================================================
126 .IX Title "SSL_accept 3"
127 .TH SSL_accept 3 "2007-10-24" "0.9.8g" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
133 SSL_accept \- wait for a TLS/SSL client to initiate a TLS/SSL handshake
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/ssl.h>
139 \& int SSL_accept(SSL *ssl);
142 .IX Header "DESCRIPTION"
143 \&\fISSL_accept()\fR waits for a \s-1TLS/SSL\s0 client to initiate the \s-1TLS/SSL\s0 handshake.
144 The communication channel must already have been set and assigned to the
145 \&\fBssl\fR by setting an underlying \fB\s-1BIO\s0\fR.
148 The behaviour of \fISSL_accept()\fR depends on the underlying \s-1BIO\s0.
150 If the underlying \s-1BIO\s0 is \fBblocking\fR, \fISSL_accept()\fR will only return once the
151 handshake has been finished or an error occurred, except for \s-1SGC\s0 (Server
152 Gated Cryptography). For \s-1SGC\s0, \fISSL_accept()\fR may return with \-1, but
153 \&\fISSL_get_error()\fR will yield \fB\s-1SSL_ERROR_WANT_READ/WRITE\s0\fR and \fISSL_accept()\fR
154 should be called again.
156 If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fISSL_accept()\fR will also return
157 when the underlying \s-1BIO\s0 could not satisfy the needs of \fISSL_accept()\fR
158 to continue the handshake, indicating the problem by the return value \-1.
159 In this case a call to \fISSL_get_error()\fR with the
160 return value of \fISSL_accept()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
161 \&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. The calling process then must repeat the call after
162 taking appropriate action to satisfy the needs of \fISSL_accept()\fR.
163 The action depends on the underlying \s-1BIO\s0. When using a non-blocking socket,
164 nothing is to be done, but \fIselect()\fR can be used to check for the required
165 condition. When using a buffering \s-1BIO\s0, like a \s-1BIO\s0 pair, data must be written
166 into or retrieved out of the \s-1BIO\s0 before being able to continue.
168 .IX Header "RETURN VALUES"
169 The following return values can occur:
171 The \s-1TLS/SSL\s0 handshake was successfully completed, a \s-1TLS/SSL\s0 connection has been
174 The \s-1TLS/SSL\s0 handshake was not successful but was shut down controlled and
175 by the specifications of the \s-1TLS/SSL\s0 protocol. Call \fISSL_get_error()\fR with the
176 return value \fBret\fR to find out the reason.
180 The \s-1TLS/SSL\s0 handshake was not successful because a fatal error occurred either
181 at the protocol level or a connection failure occurred. The shutdown was
182 not clean. It can also occur of action is need to continue the operation
183 for non-blocking BIOs. Call \fISSL_get_error()\fR with the return value \fBret\fR
184 to find out the reason.
186 .IX Header "SEE ALSO"
187 \&\fISSL_get_error\fR\|(3), \fISSL_connect\fR\|(3),
188 \&\fISSL_shutdown\fR\|(3), \fIssl\fR\|(3), \fIbio\fR\|(3),
189 \&\fISSL_set_connect_state\fR\|(3),
190 \&\fISSL_do_handshake\fR\|(3),
191 \&\fISSL_CTX_new\fR\|(3)
193 .IX Header "POD ERRORS"
194 Hey! \fBThe above document had some coding errors, which are explained below:\fR
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