nbd_set_tls_certificates - set the path to the TLS certificates directory


 #include <libnbd.h>

 int nbd_set_tls_certificates (
       struct nbd_handle *h, const char *dir


Set the path to the TLS certificates directory. If not set and TLS is used then a compiled in default is used. For root this is /etc/pki/libnbd/. For non-root this is $HOME/.pki/libnbd and $HOME/.config/pki/libnbd. If none of these directories can be found then the system trusted CAs are used.

This function may be called regardless of whether TLS is supported, but will have no effect unless nbd_set_tls(3) is also used to request or require TLS.


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, dir. For more information see "Non-NULL parameters" in libnbd(3).


nbd_set_tls_certificates 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 1.0.

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



nbd_create(3), nbd_set_tls(3), libnbd(3).


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.

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