tests/test-offset.c

   1 /* nbdkit
   2  * Copyright (C) 2018 Red Hat Inc.
   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 <stdint.h>
  38 #include <inttypes.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41 #include <fcntl.h>
  42 #include <errno.h>
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45
  46 #include <guestfs.h>
  47
  48 #include "test.h"
  49
  50 #define FILENAME "offset-data"
  51 #define FILESIZE (10 * 1024 * 1024)
  52
  53 static void
  54 create_file (void)
  55 {
  56   FILE *fp;
  57   char pattern[512];
  58   size_t i;
  59
  60   for (i = 0; i < sizeof pattern; i += 2) {
  61     pattern[i] = 0x55;
  62     pattern[i+1] = 0xAA;
  63   }
  64
  65   fp = fopen (FILENAME, "w");
  66   if (fp == NULL) {
  67     perror (FILENAME);
  68     exit (EXIT_FAILURE);
  69   }
  70
  71   for (i = 0; i < FILESIZE; i += sizeof pattern) {
  72     if (fwrite (pattern, sizeof pattern, 1, fp) != 1) {
  73       perror (FILENAME ": write");
  74       exit (EXIT_FAILURE);
  75     }
  76   }
  77
  78   if (fclose (fp) == EOF) {
  79     perror (FILENAME);
  80     exit (EXIT_FAILURE);
  81   }
  82 }
  83
  84 static uint8_t buf[1024*1024];
  85
  86 static void
  87 check_buf (void)
  88 {
  89   size_t i;
  90
  91   for (i = 0; i < sizeof buf; i += 2) {
  92     if (buf[i] != 0x55 || buf[i+1] != 0xAA) {
  93       fprintf (stderr, "%s FAILED: file overwritten outside offset/range\n",
  94                program_name);
  95       exit (EXIT_FAILURE);
  96     }
  97   }
  98 }
  99
 100 int
 101 main (int argc, char *argv[])
 102 {
 103   guestfs_h *g;
 104   int r, fd;
 105   char *data;
 106
 107   /* FILENAME is a 10 MB file containing test pattern data 0x55AA
 108    * repeated.  We use the middle 8 MB to create a partition table and
 109    * filesystem, and check afterwards that the test pattern in the
 110    * first and final megabyte has not been overwritten.
 111    */
 112   create_file ();
 113
 114   if (test_start_nbdkit ("--filter", "offset",
 115                          "file", FILENAME,
 116                          "offset=1M", "range=8M",
 117                          NULL) == -1)
 118     exit (EXIT_FAILURE);
 119
 120   g = guestfs_create ();
 121   if (g == NULL) {
 122     perror ("guestfs_create");
 123     exit (EXIT_FAILURE);
 124   }
 125
 126   r = guestfs_add_drive_opts (g, "",
 127                               GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
 128                               GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd",
 129                               GUESTFS_ADD_DRIVE_OPTS_SERVER, server,
 130                               -1);
 131   if (r == -1)
 132     exit (EXIT_FAILURE);
 133
 134   if (guestfs_launch (g) == -1)
 135     exit (EXIT_FAILURE);
 136
 137   if (guestfs_part_disk (g, "/dev/sda", "mbr") == -1)
 138     exit (EXIT_FAILURE);
 139   if (guestfs_mkfs (g, "ext2", "/dev/sda1") == -1)
 140     exit (EXIT_FAILURE);
 141
 142   if (guestfs_mount (g, "/dev/sda1", "/") == -1)
 143     exit (EXIT_FAILURE);
 144
 145 #define filename "/hello.txt"
 146 #define content "hello, people of the world"
 147
 148   if (guestfs_write (g, filename, content, strlen (content)) == -1)
 149     exit (EXIT_FAILURE);
 150
 151   data = guestfs_cat (g, filename);
 152   if (!data)
 153     exit (EXIT_FAILURE);
 154
 155   if (strcmp (data, content) != 0) {
 156     fprintf (stderr,
 157              "%s FAILED: unexpected content of %s file "
 158              "(actual: %s, expected: %s)\n",
 159              program_name, filename, data, content);
 160     exit (EXIT_FAILURE);
 161   }
 162
 163   if (guestfs_fill_dir (g, "/", 1000) == -1)
 164     exit (EXIT_FAILURE);
 165
 166   if (guestfs_shutdown (g) == -1)
 167     exit (EXIT_FAILURE);
 168
 169   guestfs_close (g);
 170
 171   /* Check the first and final megabyte of test patterns has not been
 172    * overwritten in the underlying file.
 173    */
 174   fd = open (FILENAME, O_RDONLY|O_CLOEXEC);
 175   if (fd == -1) {
 176     perror (FILENAME ": open");
 177     exit (EXIT_FAILURE);
 178   }
 179   if (pread (fd, buf, sizeof buf, 0) != sizeof buf) {
 180     fprintf (stderr, "%s: pread: short read or error (%d)\n",
 181              FILENAME, errno);
 182     exit (EXIT_FAILURE);
 183   }
 184   check_buf ();
 185   if (pread (fd, buf, sizeof buf, 9*1024*1024) != sizeof buf) {
 186     fprintf (stderr, "%s: pread: short read or error (%d)\n",
 187              FILENAME, errno);
 188     exit (EXIT_FAILURE);
 189   }
 190   check_buf ();
 191   close (fd);
 192
 193   unlink (FILENAME);
 194
 195   exit (EXIT_SUCCESS);
 196 }