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/* NBD client library in userspace
* Copyright Red Hat
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Deliberately provoke some errors and check the error messages from
* nbd_get_error etc look reasonable.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <libnbd.h>
#include "requires.h"
#define MAXSIZE 68157440 /* 65M, oversize on purpose */
static char *progname;
static char buf[MAXSIZE];
static void
check (int experr, const char *prefix)
{
const char *msg = nbd_get_error ();
int errnum = nbd_get_errno ();
fprintf (stderr, "error: \"%s\"\n", msg);
fprintf (stderr, "errno: %d (%s)\n", errnum, strerror (errnum));
if (strncmp (msg, prefix, strlen (prefix)) != 0) {
fprintf (stderr, "%s: test failed: missing context prefix: %s\n",
progname, msg);
exit (EXIT_FAILURE);
}
if (errnum != experr) {
fprintf (stderr, "%s: test failed: "
"expected errno = %d (%s), but got %d\n",
progname, experr, strerror (experr), errnum);
exit (EXIT_FAILURE);
}
}
static void
check_server_fail (struct nbd_handle *h, int64_t cookie,
const char *cmd, int experr)
{
int r;
if (cookie == -1) {
fprintf (stderr, "%s: test failed: %s not sent to server\n",
progname, cmd);
exit (EXIT_FAILURE);
}
while ((r = nbd_aio_command_completed (h, cookie)) == 0) {
if (nbd_poll (h, -1) == -1) {
fprintf (stderr, "%s: test failed: poll failed while awaiting %s: %s\n",
progname, cmd, nbd_get_error ());
exit (EXIT_FAILURE);
}
}
if (r != -1) {
fprintf (stderr, "%s: test failed: %s did not fail at server\n",
progname, cmd);
exit (EXIT_FAILURE);
}
check (experr, "nbd_aio_command_completed: ");
}
int
main (int argc, char *argv[])
{
struct nbd_handle *nbd;
const char *cmd[] = {
NBDKIT, "-s", "-v", "--exit-with-parent", "eval",
"get_size= echo 68157440",
"block_size= echo 1 512 16M",
"pread= echo EIO >&2; exit 1",
"pwrite= if test $3 -gt $((32*1024*1024)); then\n"
" exit 6\n" /* Hard disconnect */
" elif test $3 -gt $((16*1024*1024)); then\n"
" echo EOVERFLOW >&2; exit 1\n"
" fi\n"
" cat >/dev/null",
NULL,
};
uint32_t strict;
progname = argv[0];
requires ("max=$(" NBDKIT " --dump-plugin eval | "
"sed -n '/^max_known_status=/ s///p') && test \"$max\" -ge 6");
nbd = nbd_create ();
if (nbd == NULL) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Connect to the server. */
if (nbd_connect_command (nbd, (char **)cmd) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Check the advertised max sizes. */
printf ("server block size maximum: %" PRId64 "\n",
nbd_get_block_size (nbd, LIBNBD_SIZE_MAXIMUM));
printf ("libnbd payload size maximum: %" PRId64 "\n",
nbd_get_block_size (nbd, LIBNBD_SIZE_PAYLOAD));
/* Disable client-side safety check */
strict = nbd_get_strict_mode (nbd) & ~LIBNBD_STRICT_PAYLOAD;
if (nbd_set_strict_mode (nbd, strict) == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Handle graceful server rejection of oversize request */
check_server_fail (nbd,
nbd_aio_pwrite (nbd, buf, 17*1024*1024, 0,
NBD_NULL_COMPLETION, 0),
"17M nbd_aio_pwrite", EINVAL);
/* Handle abrupt server rejection of oversize request */
check_server_fail (nbd,
nbd_aio_pwrite (nbd, buf, 33*1024*1024, 0,
NBD_NULL_COMPLETION, 0),
"33M nbd_aio_pwrite", ENOTCONN);
nbd_close (nbd);
exit (EXIT_SUCCESS);
}
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