tests/test-protect.c

   1 /* nbdkit
   2  * Copyright Red Hat
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  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.
  14  *
  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.
  18  *
  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
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <config.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdbool.h>
  38 #include <stdint.h>
  39 #include <inttypes.h>
  40 #include <unistd.h>
  41 #include <errno.h>
  42
  43 #include <libnbd.h>
  44
  45 int
  46 main (int argc, char *argv[])
  47 {
  48   struct nbd_handle *nbd;
  49   char buf[1024];
  50   int r;
  51
  52   /* Check "disk" was created before running the test. */
  53   if (access ("disk", R_OK) == -1 && errno == ENOENT) {
  54     printf ("%s: test skipped because \"disk\" was not created\n", argv[0]);
  55     exit (77);
  56   }
  57
  58   nbd = nbd_create ();
  59   if (nbd == NULL) {
  60     fprintf (stderr, "%s\n", nbd_get_error ());
  61     exit (EXIT_FAILURE);
  62   }
  63
  64   if (nbd_connect_command (nbd,
  65                            (char *[]) {
  66                              "nbdkit", "-s", "--exit-with-parent",
  67                              "-v", "-D", "protect.write=1",
  68                              "--filter=protect",
  69                              "--filter=cow",
  70                              "file", "disk",
  71                              "protect=~0x1be-",
  72                              NULL }) == -1) {
  73     fprintf (stderr, "%s\n", nbd_get_error ());
  74     exit (EXIT_FAILURE);
  75   }
  76
  77   /* Read the first two sectors. */
  78   if (nbd_pread (nbd, buf, sizeof buf, 0, 0) == -1) {
  79     fprintf (stderr, "%s\n", nbd_get_error ());
  80     exit (EXIT_FAILURE);
  81   }
  82
  83   /* Modifying the second sector should be possible. */
  84   buf[512] = 1;
  85   buf[513] = 2;
  86   buf[514] = 3;
  87   if (nbd_pwrite (nbd, buf, sizeof buf, 0, 0) == -1) {
  88     fprintf (stderr, "%s\n", nbd_get_error ());
  89     exit (EXIT_FAILURE);
  90   }
  91
  92   /* Modifying the partition table should be possible. */
  93   buf[0x1be] = 1;
  94   buf[0x1bf] = 2;
  95   buf[0x1c0] = 3;
  96   if (nbd_pwrite (nbd, buf, sizeof buf, 0, 0) == -1) {
  97     fprintf (stderr, "%s\n", nbd_get_error ());
  98     exit (EXIT_FAILURE);
  99   }
 100
 101   /* Modifying the beginning of the disk must return EPERM. */
 102   buf[0] = 1;
 103   buf[1] = 2;
 104   buf[2] = 3;
 105   r = nbd_pwrite (nbd, buf, sizeof buf, 0, 0);
 106   if (r != -1) {
 107     fprintf (stderr,
 108              "%s: protect filter did not protect boot sector\n",
 109              argv[0]);
 110     exit (EXIT_FAILURE);
 111   }
 112   if (nbd_get_errno () != EPERM) {
 113     fprintf (stderr,
 114              "%s: protect filter did not return EPERM error "
 115              "(instead: %s)\n",
 116              argv[0], nbd_get_error ());
 117     exit (EXIT_FAILURE);
 118   }
 119
 120   nbd_shutdown (nbd, 0);
 121   nbd_close (nbd);
 122   exit (EXIT_SUCCESS);
 123 }