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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
#include "internal.h"
#include "byte-swapping.h"
#include "nbd-protocol.h"
int
protocol_handshake_oldstyle (void)
{
GET_CONN;
struct nbd_old_handshake handshake;
uint64_t exportsize;
uint16_t gflags, eflags;
assert (tls != 2); /* Already filtered in main */
/* With oldstyle, our only option if .open or friends fail is to
* disconnect, as we cannot report the problem to the client.
*/
if (protocol_common_open (&exportsize, &eflags, "") == -1)
return -1;
gflags = 0;
debug ("oldstyle negotiation: flags: global 0x%x export 0x%x",
gflags, eflags);
memset (&handshake, 0, sizeof handshake);
handshake.nbdmagic = htobe64 (NBD_MAGIC);
handshake.version = htobe64 (NBD_OLD_VERSION);
handshake.exportsize = htobe64 (exportsize);
handshake.gflags = htobe16 (gflags);
handshake.eflags = htobe16 (eflags);
if (conn->send (&handshake, sizeof handshake, 0) == -1) {
nbdkit_error ("write: %m");
return -1;
}
return 0;
}
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