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Edit File : SSL_get_session.3ssl \| Size : 6.55 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_get_session \- retrieve TLS/SSL session data .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& SSL_SESSION SSL_get_session(const SSL ssl); \& SSL_SESSION SSL_get0_session(const SSL ssl); \& SSL_SESSION SSL_get1_session(SSL *ssl); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_get_session()\fR returns a pointer to the \fB\s-1SSL_SESSION\s0\fR actually used in \&\fBssl\fR. The reference count of the \fB\s-1SSL_SESSION\s0\fR is not incremented, so that the pointer can become invalid by other operations. .PP \&\fBSSL_get0_session()\fR is the same as \fBSSL_get_session()\fR. .PP \&\fBSSL_get1_session()\fR is the same as \fBSSL_get_session()\fR, but the reference count of the \fB\s-1SSL_SESSION\s0\fR is incremented by one. .SH "NOTES" .IX Header "NOTES" The ssl session contains all information required to re-establish the connection without a new handshake. .PP A session will be automatically removed from the session cache and marked as non-resumable if the connection is not closed down cleanly, e.g. if a fatal error occurs on the connection or \fBSSL_shutdown\fR\\|(3) is not called prior to \&\fBSSL_free\fR\\|(3). .PP \&\fBSSL_get0_session()\fR returns a pointer to the actual session. As the reference counter is not incremented, the pointer is only valid while the connection is in use. If \fBSSL_clear\fR\\|(3) or \&\fBSSL_free\fR\\|(3) is called, the session may be removed completely (if considered bad), and the pointer obtained will become invalid. Even if the session is valid, it can be removed at any time due to timeout during \fBSSL_CTX_flush_sessions\fR\\|(3). .PP If the data is to be kept, \fBSSL_get1_session()\fR will increment the reference count, so that the session will not be implicitly removed by other operations but stays in memory. In order to remove the session \&\fBSSL_SESSION_free\fR\\|(3) must be explicitly called once to decrement the reference count again. .PP \&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache list, when being inserted into one \s-1SSL_CTX\s0 object's session cache. One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created from this \s-1SSL_CTX\s0 object). .SH "RETURN VALUES" .IX Header "RETURN VALUES" The following return values can occur: .IP "\s-1NULL\s0" 4 .IX Item "NULL" There is no session available in \fBssl\fR. .IP "Pointer to an \s-1SSL\s0" 4 .IX Item "Pointer to an SSL" The return value points to the data of an \s-1SSL\s0 session. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\\|(3), \fBSSL_free\fR\\|(3), \&\fBSSL_clear\fR\\|(3), \&\fBSSL_SESSION_free\fR\\|(3) Back

Edit File : SSL_get_session.3ssl | Size : 6.55 KB

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.\" ========================================================================
.\"
.IX Title "SSL_get_session 3"
.TH SSL_get_session 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_get_session \- retrieve TLS/SSL session data
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& SSL_SESSION *SSL_get_session(const SSL *ssl);
\& SSL_SESSION *SSL_get0_session(const SSL *ssl);
\& SSL_SESSION *SSL_get1_session(SSL *ssl);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_get_session()\fR returns a pointer to the \fB\s-1SSL_SESSION\s0\fR actually used in
\&\fBssl\fR. The reference count of the \fB\s-1SSL_SESSION\s0\fR is not incremented, so
that the pointer can become invalid by other operations.
.PP
\&\fBSSL_get0_session()\fR is the same as \fBSSL_get_session()\fR.
.PP
\&\fBSSL_get1_session()\fR is the same as \fBSSL_get_session()\fR, but the reference
count of the \fB\s-1SSL_SESSION\s0\fR is incremented by one.
.SH "NOTES"
.IX Header "NOTES"
The ssl session contains all information required to re-establish the
connection without a new handshake.
.PP
A session will be automatically removed from the session cache and marked as
non-resumable if the connection is not closed down cleanly, e.g. if a fatal
error occurs on the connection or \fBSSL_shutdown\fR\|(3) is not called prior to
\&\fBSSL_free\fR\|(3).
.PP
\&\fBSSL_get0_session()\fR returns a pointer to the actual session. As the
reference counter is not incremented, the pointer is only valid while
the connection is in use. If \fBSSL_clear\fR\|(3) or
\&\fBSSL_free\fR\|(3) is called, the session may be removed completely
(if considered bad), and the pointer obtained will become invalid. Even
if the session is valid, it can be removed at any time due to timeout
during \fBSSL_CTX_flush_sessions\fR\|(3).
.PP
If the data is to be kept, \fBSSL_get1_session()\fR will increment the reference
count, so that the session will not be implicitly removed by other operations
but stays in memory. In order to remove the session
\&\fBSSL_SESSION_free\fR\|(3) must be explicitly called once
to decrement the reference count again.
.PP
\&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
from this \s-1SSL_CTX\s0 object).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "\s-1NULL\s0" 4
.IX Item "NULL"
There is no session available in \fBssl\fR.
.IP "Pointer to an \s-1SSL\s0" 4
.IX Item "Pointer to an SSL"
The return value points to the data of an \s-1SSL\s0 session.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3), \fBSSL_free\fR\|(3),
\&\fBSSL_clear\fR\|(3),
\&\fBSSL_SESSION_free\fR\|(3)

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