nbd-client: Stricter enforcing of structured reply spec
commitb4176cb314995ad225d6c2b531568801feb04f3f
authorEric Blake <eblake@redhat.com>
Wed, 8 Nov 2017 21:57:02 +0000 (8 15:57 -0600)
committerEric Blake <eblake@redhat.com>
Thu, 9 Nov 2017 16:22:26 +0000 (9 10:22 -0600)
tree40e07ee6187137216d787742c43b3213c00cc450
parent9d8f818cdee83e726a5dd14b645738ec632d2577
nbd-client: Stricter enforcing of structured reply spec

Ensure that the server is not sending unexpected chunk lengths
for either the NONE or the OFFSET_DATA chunk, nor unexpected
hole length for OFFSET_HOLE.  This will flag any server as
broken that responds to a zero-length read with an OFFSET_DATA
(what our server currently does, but that's about to be fixed)
or with OFFSET_HOLE, even though we previously fixed our client
to never be able to send such a request over the wire.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20171108215703.9295-7-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
block/nbd-client.c