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.\" ========================================================================
.\"
.IX Title "nbd_get_tls_negotiated 3"
.TH nbd_get_tls_negotiated 3 "2021-02-09" "libnbd-1.6.1" "LIBNBD"
.\" 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"
nbd_get_tls_negotiated \- find out if TLS was negotiated on a connection
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <libnbd.h>
\&
\& int nbd_get_tls_negotiated (struct nbd_handle *h);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
After connecting you may call this to find out if the
connection is using \s-1TLS.\s0
.PP
This is only really useful if you set the \s-1TLS\s0 request mode
to \f(CW\*(C`LIBNBD_TLS_ALLOW\*(C'\fR (see \fBnbd_set_tls\fR\|(3)), because in this
mode we try to use \s-1TLS\s0 but fall back to unencrypted if it was
not available.  This function will tell you if \s-1TLS\s0 was
negotiated or not.
.PP
In \f(CW\*(C`LIBNBD_TLS_REQUIRE\*(C'\fR mode (the most secure) the connection
would have failed if \s-1TLS\s0 could not be negotiated, and in
\&\f(CW\*(C`LIBNBD_TLS_DISABLE\*(C'\fR mode \s-1TLS\s0 is not tried.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
This call returns a boolean value.
.SH "ERRORS"
.IX Header "ERRORS"
On error \f(CW\*(C`\-1\*(C'\fR is returned.
.PP
Refer to \*(L"\s-1ERROR HANDLING\*(R"\s0 in \fBlibnbd\fR\|(3)
for how to get further details of the error.
.SH "HANDLE STATE"
.IX Header "HANDLE STATE"
The handle must be
negotiating, or connected with the server, or shut down,
otherwise this call will return an error.
.SH "VERSION"
.IX Header "VERSION"
This function first appeared in libnbd 1.2.
.PP
If you need to test if this function is available at compile time
check if the following macro is defined:
.PP
.Vb 1
\& #define LIBNBD_HAVE_NBD_GET_TLS_NEGOTIATED 1
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBnbd_create\fR\|(3),
\&\fBnbd_get_tls\fR\|(3),
\&\fBnbd_set_tls\fR\|(3),
\&\fBlibnbd\fR\|(3).
.SH "AUTHORS"
.IX Header "AUTHORS"
Eric Blake
.PP
Richard W.M. Jones
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2019\-2020 Red Hat Inc.
.SH "LICENSE"
.IX Header "LICENSE"
This library is free software; you can redistribute it and/or
modify it under the terms of the \s-1GNU\s0 Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
.PP
This library is distributed in the hope that it will be useful,
but \s-1WITHOUT ANY WARRANTY\s0; without even the implied warranty of
\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS FOR A PARTICULAR PURPOSE.\s0  See the \s-1GNU\s0
Lesser General Public License for more details.
.PP
You should have received a copy of the \s-1GNU\s0 Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, \s-1MA 02110\-1301 USA\s0