200 lines
6.2 KiB
Groff
200 lines
6.2 KiB
Groff
.\" Automatically generated by Pod::Man version 1.15
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.\" Wed Feb 19 16:47:44 2003
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.\" ======================================================================
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.\"
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.IX Title "SSL_connect 3"
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.TH SSL_connect 3 "0.9.7a" "2003-02-19" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_connect \- initiate the \s-1TLS/SSL\s0 handshake with an \s-1TLS/SSL\s0 server
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 1
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\& int SSL_connect(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_connect()\fR initiates the \s-1TLS/SSL\s0 handshake with a server. The communication
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channel must already have been set and assigned to the \fBssl\fR by setting an
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underlying \fB\s-1BIO\s0\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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The behaviour of \fISSL_connect()\fR depends on the underlying \s-1BIO\s0.
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.PP
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If the underlying \s-1BIO\s0 is \fBblocking\fR, \fISSL_connect()\fR will only return once the
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handshake has been finished or an error occurred.
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.PP
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If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fISSL_connect()\fR will also return
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when the underlying \s-1BIO\s0 could not satisfy the needs of \fISSL_connect()\fR
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to continue the handshake. In this case a call to \fISSL_get_error()\fR with the
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return value of \fISSL_connect()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
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\&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. The calling process then must repeat the call after
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taking appropriate action to satisfy the needs of \fISSL_connect()\fR.
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The action depends on the underlying \s-1BIO\s0. When using a non-blocking socket,
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nothing is to be done, but \fIselect()\fR can be used to check for the required
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condition. When using a buffering \s-1BIO\s0, like a \s-1BIO\s0 pair, data must be written
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into or retrieved out of the \s-1BIO\s0 before being able to continue.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following return values can occur:
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.Ip "1" 4
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.IX Item "1"
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The \s-1TLS/SSL\s0 handshake was successfully completed, a \s-1TLS/SSL\s0 connection has been
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established.
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.Ip "0" 4
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The \s-1TLS/SSL\s0 handshake was not successful but was shut down controlled and
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by the specifications of the \s-1TLS/SSL\s0 protocol. Call \fISSL_get_error()\fR with the
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return value \fBret\fR to find out the reason.
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.Ip "<0" 4
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.IX Item "<0"
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The \s-1TLS/SSL\s0 handshake was not successful, because a fatal error occurred either
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at the protocol level or a connection failure occurred. The shutdown was
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not clean. It can also occur of action is need to continue the operation
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for non-blocking BIOs. Call \fISSL_get_error()\fR with the return value \fBret\fR
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to find out the reason.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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SSL_get_error(3), SSL_accept(3),
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SSL_shutdown(3), ssl(3), bio(3),
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SSL_set_connect_state(3),
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SSL_do_handshake(3),
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SSL_CTX_new(3)
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