nbd/server: Refactor zero-length option check
Consolidate the response for a non-zero-length option payload into a new function, nbd_reject_length(). This check will also be used when introducing support for structured replies. Note that STARTTLS response differs based on time: if the connection is still unencrypted, we set fatal to true (a client that can't request TLS correctly may still think that we are ready to start the TLS handshake, so we must disconnect); while if the connection is already encrypted, the client is sending a bogus request but is no longer at risk of being confused by continuing the connection. Signed-off-by: NEric Blake <eblake@redhat.com> Message-Id: <20171027104037.8319-7-eblake@redhat.com> [eblake: correct return value on STARTTLS] Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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