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.IX Title "nbd_set_uri_allow_tls_priority 3"
.TH nbd_set_uri_allow_tls_priority 3 2025-12-16 libnbd-1.24.0 LIBNBD
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.nh
.SH NAME
nbd_set_uri_allow_tls_priority \- set if \*(Aqtls\-priority\*(Aq is allowed in
NBD URIs
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <libnbd.h>
\&
\& int nbd_set_uri_allow_tls_priority (
\&       struct nbd_handle *h, bool allow
\&     );
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Allow NBD URIs to override the TLS priority
using \f(CW\*(C`?tls\-priority=PRIORITY\*(C'\fR in the query string.
.PP
This is \fIdisabled\fR by default because it is probably not
safe.  The TLS priority string is quite powerful, allowing
you to read some local configuration files, and possibly to
downgrade TLS security.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
If the call is successful the function returns \f(CW0\fR.
.SH ERRORS
.IX Header "ERRORS"
On error \f(CW\-1\fR is returned.
.PP
Refer to "ERROR HANDLING" in \fBlibnbd\fR\|(3)
for how to get further details of the error.
.PP
The following parameters must not be NULL: \f(CW\*(C`h\*(C'\fR.
For more information see "Non\-NULL parameters" in \fBlibnbd\fR\|(3).
.SH "HANDLE STATE"
.IX Header "HANDLE STATE"
nbd_set_uri_allow_tls_priority
can be called when the handle is in the following state:
.PP
.Vb 8
\& ┌─────────────────────────────────────┬─────────────────────────┐
\& │ Handle created, before connecting   │ ✅ allowed              │
\& │ Connecting                          │ ❌ error                │
\& │ Connecting & handshaking (opt_mode) │ ❌ error                │
\& │ Connected to the server             │ ❌ error                │
\& │ Connection shut down                │ ❌ error                │
\& │ Handle dead                         │ ❌ error                │
\& └─────────────────────────────────────┴─────────────────────────┘
.Ve
.SH VERSION
.IX Header "VERSION"
This function first appeared in libnbd 1.24.
.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_SET_URI_ALLOW_TLS_PRIORITY 1
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBnbd_connect_uri\fR\|(3),
\&\fBnbd_create\fR\|(3),
\&\fBlibnbd\fR\|(3),
https://gnutls.org/manual/html_node/Priority\-Strings.html.
.SH AUTHORS
.IX Header "AUTHORS"
Eric Blake
.PP
Richard W.M. Jones
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright Red Hat
.SH LICENSE
.IX Header "LICENSE"
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU 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 WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
.PP
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110\-1301 USA