add option for gnutls priority string #152
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This patch introduces a parallel command-line option to specify a GNUTLS priority-string for the client (it already exists on the server). The server allows an arbitrary string that contains parameters for e.g. TLS-version and acceptable ciphers; the client is hard-coded currently to `#define PRIORITY "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2"` in crypto-gnutls.c. With the introduction of this patch, the client can e.g. use TLS1.3; or be set specifically to match whatever arbitrary TLS options the server requires. The server does have a default setting of "%SERVER_PRECEDENCE"; however, that seems to apply only to server-selected ciphers: not any arbitrary TLS options to pass through to GNUTLS. I initially ran into this issue when I created TLS1.3 CA/client/server certs, and got TLS errors running NBD; I then experimented with the nbd-client executable by `sed`-ing it to replace the PRIORITY string `1.2` with `1.3` in the binary itself, and was then able to successfully connect; but I figured it would be better to offer a parallel option (like the server-side) than to change the hard-coded string in the code-base, or only add a tls-version command-line option.
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see https://lists.debian.org/nbd/2023/08/msg00009.html