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.\" ========================================================================
.\"
.IX Title "SSL_IN_INIT 3ossl"
.TH SSL_IN_INIT 3ossl "2026-01-27" "3.5.5" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_in_before,
SSL_in_init,
SSL_is_init_finished,
SSL_in_connect_init,
SSL_in_accept_init,
SSL_get_state
\&\- retrieve information about the handshake state machine
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_in_init(const SSL *s);
\& int SSL_in_before(const SSL *s);
\& int SSL_is_init_finished(const SSL *s);
\&
\& int SSL_in_connect_init(SSL *s);
\& int SSL_in_accept_init(SSL *s);
\&
\& OSSL_HANDSHAKE_STATE SSL_get_state(const SSL *ssl);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_in_init()\fR returns 1 if the \s-1SSL/TLS\s0 state machine is currently processing or
awaiting handshake messages, or 0 otherwise.
.PP
\&\fBSSL_in_before()\fR returns 1 if no \s-1SSL/TLS\s0 handshake has yet been initiated, or 0
otherwise.
.PP
\&\fBSSL_is_init_finished()\fR returns 1 if the \s-1SSL/TLS\s0 connection is in a state where
fully protected application data can be transferred or 0 otherwise.
.PP
Note that in some circumstances (such as when early data is being transferred)
\&\fBSSL_in_init()\fR, \fBSSL_in_before()\fR and \fBSSL_is_init_finished()\fR can all return 0.
.PP
\&\fBs\fR \fB\s-1MUST NOT\s0\fR be \s-1NULL.\s0
.PP
\&\fBSSL_in_connect_init()\fR returns 1 if \fBs\fR is acting as a client and \fBSSL_in_init()\fR
would return 1, or 0 otherwise.
.PP
\&\fBSSL_in_accept_init()\fR returns 1 if \fBs\fR is acting as a server and \fBSSL_in_init()\fR
would return 1, or 0 otherwise.
.PP
\&\fBSSL_in_connect_init()\fR and \fBSSL_in_accept_init()\fR are implemented as macros.
.PP
\&\fBSSL_get_state()\fR returns a value indicating the current state of the handshake
state machine. \s-1OSSL_HANDSHAKE_STATE\s0 is an enumerated type where each value
indicates a discrete state machine state. Note that future versions of OpenSSL
may define more states so applications should expect to receive unrecognised
state values. The naming format is made up of a number of elements as follows:
.PP
\&\fBprotocol\fR_ST_\fBrole\fR_\fBmessage\fR
.PP
\&\fBprotocol\fR is one of \s-1TLS\s0 or \s-1DTLS. DTLS\s0 is used where a state is specific to the
\&\s-1DTLS\s0 protocol. Otherwise \s-1TLS\s0 is used.
.PP
\&\fBrole\fR is one of \s-1CR, CW, SR\s0 or \s-1SW\s0 to indicate \*(L"client reading\*(R",
\&\*(L"client writing\*(R", \*(L"server reading\*(R" or \*(L"server writing\*(R" respectively.
.PP
\&\fBmessage\fR is the name of a handshake message that is being or has been sent, or
is being or has been processed.
.PP
Additionally there are some special states that do not conform to the above
format. These are:
.IP "\s-1TLS_ST_BEFORE\s0" 4
.IX Item "TLS_ST_BEFORE"
No handshake messages have yet been been sent or received.
.IP "\s-1TLS_ST_OK\s0" 4
.IX Item "TLS_ST_OK"
Handshake message sending/processing has completed.
.IP "\s-1TLS_ST_EARLY_DATA\s0" 4
.IX Item "TLS_ST_EARLY_DATA"
Early data is being processed
.IP "\s-1TLS_ST_PENDING_EARLY_DATA_END\s0" 4
.IX Item "TLS_ST_PENDING_EARLY_DATA_END"
Awaiting the end of early data processing
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_in_init()\fR, \fBSSL_in_before()\fR, \fBSSL_is_init_finished()\fR, \fBSSL_in_connect_init()\fR
and \fBSSL_in_accept_init()\fR return values as indicated above.
.PP
\&\fBSSL_get_state()\fR returns the current handshake state.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(7),
\&\fBSSL_read_early_data\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
