interop/list-exports.c

   1 /* NBD client library in userspace
   2  * Copyright Red Hat
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /* Test nbd_set_list_exports against an NBD server. */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <stdint.h>
  24 #include <inttypes.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include <libnbd.h>
  29
  30 #include "array-size.h"
  31
  32 #include "../tests/requires.h"
  33
  34 #ifdef NEEDS_TMPFILE
  35 #define TMPFILE tmp
  36 static char tmp[] = "/tmp/nbdXXXXXX";
  37
  38 static void
  39 unlink_tmpfile (void)
  40 {
  41   unlink (TMPFILE);
  42 }
  43 #endif /* NEEDS_TMPFILE */
  44
  45 static const char *exports[] = { EXPORTS };
  46 static const char *descriptions[ARRAY_SIZE (exports)] = { DESCRIPTIONS };
  47 static char *actual[ARRAY_SIZE (exports)][2]; /* (name, description) recvd */
  48
  49 static char *progname;
  50
  51 static int
  52 append (void *opaque, const char *name, const char *description)
  53 {
  54   size_t *ip = opaque;
  55   size_t i = *ip;
  56
  57   if (i >= ARRAY_SIZE (exports)) {
  58     fprintf (stderr, "%s: server returned more exports than expected",
  59              progname);
  60     exit (EXIT_FAILURE);
  61   }
  62
  63   printf ("append: i=%zu name=\"%s\" description=\"%s\"\n",
  64           i, name, description);
  65   fflush (stdout);
  66
  67   actual[i][0] = strdup (name);
  68   actual[i][1] = strdup (description);
  69   if (!actual[i][0] || !actual[i][1]) abort ();
  70
  71   (*ip)++;
  72   return 0;
  73 }
  74
  75 static int
  76 compare_actuals (const void *vp1, const void *vp2)
  77 {
  78   return strcmp (* (char * const *) vp1, * (char * const *) vp2);
  79 }
  80
  81 static void
  82 free_actuals (void)
  83 {
  84   size_t i;
  85
  86   for (i = 0; i < ARRAY_SIZE (exports); ++i) {
  87     free (actual[i][0]);
  88     free (actual[i][1]);
  89   }
  90 }
  91
  92 int
  93 main (int argc, char *argv[])
  94 {
  95   struct nbd_handle *nbd;
  96   size_t i = 0;
  97
  98   progname = argv[0];
  99
 100   /* Check requirements or skip the test. */
 101 #ifdef REQUIRES
 102   REQUIRES
 103 #endif
 104
 105 #ifdef NEEDS_TMPFILE
 106   /* Create a sparse temporary file. */
 107   int fd = mkstemp (TMPFILE);
 108   if (fd == -1 ||
 109       ftruncate (fd, 1024) == -1 ||
 110       close (fd) == -1) {
 111     perror (TMPFILE);
 112     exit (EXIT_FAILURE);
 113   }
 114   atexit (unlink_tmpfile);
 115 #endif
 116
 117   nbd = nbd_create ();
 118   if (nbd == NULL) {
 119     fprintf (stderr, "%s\n", nbd_get_error ());
 120     exit (EXIT_FAILURE);
 121   }
 122
 123   /* Set option mode in the handle. */
 124   nbd_set_opt_mode (nbd, true);
 125
 126   /* Run the NBD server. */
 127   char *args[] = { SERVER, SERVER_PARAMS, NULL };
 128 #if SOCKET_ACTIVATION
 129 #define NBD_CONNECT nbd_connect_systemd_socket_activation
 130 #else
 131 #define NBD_CONNECT nbd_connect_command
 132 #endif
 133   if (NBD_CONNECT (nbd, args) == -1 ||
 134       nbd_opt_list (nbd, (nbd_list_callback) {
 135           .callback = append, .user_data = &i}) == -1) {
 136     fprintf (stderr, "%s\n", nbd_get_error ());
 137     exit (EXIT_FAILURE);
 138   }
 139
 140   /* Check for expected number of exports. */
 141   if (i != ARRAY_SIZE (exports)) {
 142     fprintf (stderr, "%s: expected %zu export, but got %zu\n",
 143              argv[0], ARRAY_SIZE (exports), i);
 144     exit (EXIT_FAILURE);
 145   }
 146
 147   /* Servers won't always return the list of exports in a particular
 148    * order.  In particular nbdkit-file-plugin returns them in the
 149    * order they are read from the directory by readdir.  Sort before
 150    * comparing.
 151    */
 152   qsort (actual, ARRAY_SIZE (exports), sizeof actual[0], compare_actuals);
 153
 154   for (i = 0; i < ARRAY_SIZE (exports); ++i) {
 155     if (strcmp (actual[i][0], exports[i]) != 0) {
 156       fprintf (stderr, "%s: expected export \"%s\", but got \"%s\"\n",
 157                progname, exports[i], actual[i][0]);
 158       exit (EXIT_FAILURE);
 159     }
 160     if (strcmp (actual[i][1], descriptions[i]) != 0) {
 161       fprintf (stderr, "%s: expected description \"%s\", but got \"%s\"\n",
 162                progname, descriptions[i], actual[i][1]);
 163       exit (EXIT_FAILURE);
 164     }
 165   }
 166
 167   nbd_opt_abort (nbd);
 168   nbd_close (nbd);
 169   free_actuals ();
 170   exit (EXIT_SUCCESS);
 171 }