Security

There were no security issues found in this release. If you find a security issue, please read SECURITY in the source (online here: https://github.com/libguestfs/libnbd/blob/master/SECURITY). To find out about previous security issues in libnbd, see libnbd-security(3).

New APIs

nbd_set_opt_mode(3)

nbd_get_opt_mode(3)

nbd_aio_is_negotiating(3)

libnbd 1.4 adds a new “negotiating” state during NBD handshaking. For backwards compatibility programs must request this before starting the connection by calling nbd_set_opt_mode(3). You can find out if the connection is in this state by calling nbd_aio_is_negotiating(3).

For an in-depth description of how this extra state can be used to negotiate server options, see "CONTROLLING NEGOTIATION" in libnbd(3).

nbd_aio_opt_abort(3)

nbd_opt_abort(3)

During the negotiating state, abort the connection.

nbd_aio_opt_go(3)

nbd_opt_go(3)

During the negotiating state, complete the handshake.

nbd_aio_opt_info(3)

nbd_opt_info(3)

During the negotiating state, request full information about the server export.

nbd_aio_opt_list(3)

nbd_opt_list(3)

During the negotiating state, request the list of exports that the server provides.

nbd_get_block_size(3)

Return the minimum, preferred or maximum block size constraints for requests sent to the server.

nbd_get_canonical_export_name(3)

Return the canonical export name that the server defaults to. This information may only be available if you call nbd_set_full_info(3) before connecting.

nbd_get_export_description(3)

Return the optional text description of the current export. This information may only be available if you call nbd_set_full_info(3) before connecting.

nbd_set_full_info(3)

nbd_get_full_info(3)

Enable extended information about exports from the server.

Thanks: Eric Blake for all of the new APIs.

New features

Bindings are now available in the Go programming language.

FreeBSD and OpenBSD are now fully supported platforms.

Bash tab completion is available for all of the command line tools.

Documentation

Verbatim text in man pages that wrapped over several lines is now typeset correctly.

Links within the documentation have been enhanced, and are now checked for correctness.

Tools

New nbdcopy(1) tool lets you copy between an NBD server and a local file, or stream to and from an NBD server.

New nbdinfo(1) tool lets you print extended information about an NBD server’s exports (Eric Blake).

Tests

Test sockets are created in /tmp (instead of the local directory). This stops the test suite from failing if the local directory path is longer than the Unix domain socket maximum path length.

Other improvements and bug fixes

Trace messages have been improved: long strings are truncated, strings with non-printable characters are escaped, and lists of strings are printed.

The generator was split from a large single script into several small files. To build from git the OCaml bytecode compiler (ocamlc(1)) is now required instead of the interpreter (ocaml(1)).

Long login names are supported in nbd_get_tls_username(3).

The handle name in nbdsh(1) is now set to "nbdsh" (instead of a randomly generated name).

Compatibility with OCaml 4.10.0 and 4.11.0.

Python AIO buffer adds a new "is_zero" method allowing Python clients to do sparsification when copying.

Compatibility with Python 3.9.

External C programs can now be compiled against libnbd’s build directory using "../libnbd/run ./configure".

Honggfuzz can be used as another external fuzzing option.

Fix compilation with glibc 2.32 which deprecates "sys_errlist".

Many examples added or extended to demonstrate uses of the new APIs (Eric Blake).