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Edit File : SSL_accept.3ssl \| Size : 6.44 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_accept \- wait for a TLS/SSL client to initiate a TLS/SSL handshake .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& int SSL_accept(SSL ssl); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_accept()\fR waits for a \s-1TLS/SSL\s0 client to initiate the \s-1TLS/SSL\s0 handshake. The communication channel must already have been set and assigned to the \&\fBssl\fR by setting an underlying \fB\s-1BIO\s0\fR. .SH "NOTES" .IX Header "NOTES" The behaviour of \fBSSL_accept()\fR depends on the underlying \s-1BIO.\s0 .PP If the underlying \s-1BIO\s0 is \fBblocking\fR, \fBSSL_accept()\fR will only return once the handshake has been finished or an error occurred. .PP If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fBSSL_accept()\fR will also return when the underlying \s-1BIO\s0 could not satisfy the needs of \fBSSL_accept()\fR to continue the handshake, indicating the problem by the return value \-1. In this case a call to \fBSSL_get_error()\fR with the return value of \fBSSL_accept()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or \&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. The calling process then must repeat the call after taking appropriate action to satisfy the needs of \fBSSL_accept()\fR. The action depends on the underlying \s-1BIO.\s0 When using a non-blocking socket, nothing is to be done, but \fBselect()\fR can be used to check for the required condition. When using a buffering \s-1BIO,\s0 like a \s-1BIO\s0 pair, data must be written into or retrieved out of the \s-1BIO\s0 before being able to continue. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The following return values can occur: .IP "0" 4 The \s-1TLS/SSL\s0 handshake was not successful but was shut down controlled and by the specifications of the \s-1TLS/SSL\s0 protocol. Call \fBSSL_get_error()\fR with the return value \fBret\fR to find out the reason. .IP "1" 4 .IX Item "1" The \s-1TLS/SSL\s0 handshake was successfully completed, a \s-1TLS/SSL\s0 connection has been established. .IP "<0" 4 .IX Item "<0" The \s-1TLS/SSL\s0 handshake was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. The shutdown was not clean. It can also occur of action is need to continue the operation for non-blocking BIOs. Call \fBSSL_get_error()\fR with the return value \fBret\fR to find out the reason. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBSSL_get_error\fR\\|(3), \fBSSL_connect\fR\\|(3), \&\fBSSL_shutdown\fR\\|(3), \fBssl\fR\\|(3), \fBbio\fR\\|(3), \&\fBSSL_set_connect_state\fR\\|(3), \&\fBSSL_do_handshake\fR\\|(3), \&\fBSSL_CTX_new\fR\\|(3) Back

Edit File : SSL_accept.3ssl | Size : 6.44 KB

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.\" ========================================================================
.\"
.IX Title "SSL_accept 3"
.TH SSL_accept 3 "2019-12-20" "1.0.2u" "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_accept \- wait for a TLS/SSL client to initiate a TLS/SSL handshake
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_accept(SSL *ssl);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_accept()\fR waits for a \s-1TLS/SSL\s0 client to initiate the \s-1TLS/SSL\s0 handshake.
The communication channel must already have been set and assigned to the
\&\fBssl\fR by setting an underlying \fB\s-1BIO\s0\fR.
.SH "NOTES"
.IX Header "NOTES"
The behaviour of \fBSSL_accept()\fR depends on the underlying \s-1BIO.\s0
.PP
If the underlying \s-1BIO\s0 is \fBblocking\fR, \fBSSL_accept()\fR will only return once the
handshake has been finished or an error occurred.
.PP
If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fBSSL_accept()\fR will also return
when the underlying \s-1BIO\s0 could not satisfy the needs of \fBSSL_accept()\fR
to continue the handshake, indicating the problem by the return value \-1.
In this case a call to \fBSSL_get_error()\fR with the
return value of \fBSSL_accept()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
\&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. The calling process then must repeat the call after
taking appropriate action to satisfy the needs of \fBSSL_accept()\fR.
The action depends on the underlying \s-1BIO.\s0 When using a non-blocking socket,
nothing is to be done, but \fBselect()\fR can be used to check for the required
condition. When using a buffering \s-1BIO,\s0 like a \s-1BIO\s0 pair, data must be written
into or retrieved out of the \s-1BIO\s0 before being able to continue.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "0" 4
The \s-1TLS/SSL\s0 handshake was not successful but was shut down controlled and
by the specifications of the \s-1TLS/SSL\s0 protocol. Call \fBSSL_get_error()\fR with the
return value \fBret\fR to find out the reason.
.IP "1" 4
.IX Item "1"
The \s-1TLS/SSL\s0 handshake was successfully completed, a \s-1TLS/SSL\s0 connection has been
established.
.IP "<0" 4
.IX Item "<0"
The \s-1TLS/SSL\s0 handshake was not successful because a fatal error occurred either
at the protocol level or a connection failure occurred. The shutdown was
not clean. It can also occur of action is need to continue the operation
for non-blocking BIOs. Call \fBSSL_get_error()\fR with the return value \fBret\fR
to find out the reason.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBSSL_get_error\fR\|(3), \fBSSL_connect\fR\|(3),
\&\fBSSL_shutdown\fR\|(3), \fBssl\fR\|(3), \fBbio\fR\|(3),
\&\fBSSL_set_connect_state\fR\|(3),
\&\fBSSL_do_handshake\fR\|(3),
\&\fBSSL_CTX_new\fR\|(3)

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