nbd_set_uri_allow_tls_priority - Man Page

 #include <libnbd.h>

 int nbd_set_uri_allow_tls_priority (
       struct nbd_handle *h, bool allow
     );

Allow NBD URIs to override the TLS priority using ?tls-priority=PRIORITY in the query string.

This is disabled 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.

If the call is successful the function returns 0.

On error -1 is returned.

Refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.

The following parameters must not be NULL: h. For more information see "Non-NULL parameters" in libnbd(3).

nbd_set_uri_allow_tls_priority can be called when the handle is in the following state:

 ┌─────────────────────────────────────┬─────────────────────────┐
 │ Handle created, before connecting   │ ✅ allowed              │
 │ Connecting                          │ ❌ error                │
 │ Connecting & handshaking (opt_mode) │ ❌ error                │
 │ Connected to the server             │ ❌ error                │
 │ Connection shut down                │ ❌ error                │
 │ Handle dead                         │ ❌ error                │
 └─────────────────────────────────────┴─────────────────────────┘

This function first appeared in libnbd 1.24.

If you need to test if this function is available at compile time check if the following macro is defined:

 #define LIBNBD_HAVE_NBD_SET_URI_ALLOW_TLS_PRIORITY 1

nbd_connect_uri(3), nbd_create(3), libnbd(3), https://gnutls.org/manual/html_node/Priority-Strings.html.

Eric Blake

Richard W.M. Jones

Copyright Red Hat

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.

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.

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

libnbd(3), NBD(3), nbd_connect_uri(3).