2 * Copyright (C) 2013-2019 Red Hat Inc.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * * Neither the name of Red Hat nor the names of its contributors may be
16 * used to endorse or promote products derived from this software without
17 * specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
22 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 #include "byte-swapping.h"
44 #include "nbd-protocol.h"
47 protocol_handshake_oldstyle (struct connection
*conn
)
49 struct nbd_old_handshake handshake
;
51 uint16_t gflags
, eflags
;
53 assert (tls
!= 2); /* Already filtered in main */
55 /* With oldstyle, our only option if .open or friends fail is to
56 * disconnect, as we cannot report the problem to the client.
58 if (protocol_common_open (conn
, &exportsize
, &eflags
) == -1)
62 debug ("oldstyle negotiation: flags: global 0x%x export 0x%x",
65 memset (&handshake
, 0, sizeof handshake
);
66 handshake
.nbdmagic
= htobe64 (NBD_MAGIC
);
67 handshake
.version
= htobe64 (NBD_OLD_VERSION
);
68 handshake
.exportsize
= htobe64 (exportsize
);
69 handshake
.gflags
= htobe16 (gflags
);
70 handshake
.eflags
= htobe16 (eflags
);
72 if (conn
->send (conn
, &handshake
, sizeof handshake
, 0) == -1) {
73 nbdkit_error ("write: %m");