usr.sbin/fstyp/geli.c

   1 /*-
   2  * Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/disk.h>
  31 #include <sys/types.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #include <geom/eli/g_eli.h>
  37
  38 #include "fstyp.h"
  39
  40 int
  41 fstyp_geli(FILE *fp, char *label __unused, size_t labelsize __unused)
  42 {
  43         int error;
  44         off_t mediasize;
  45         u_int sectorsize;
  46         struct g_eli_metadata md;
  47         u_char *buf;
  48
  49         error = ioctl(fileno(fp), DIOCGMEDIASIZE, &mediasize);
  50         if (error != 0)
  51                 return (1);
  52         error = ioctl(fileno(fp), DIOCGSECTORSIZE, &sectorsize);
  53         if (error != 0)
  54                 return (1);
  55         buf = (u_char *)read_buf(fp, mediasize - sectorsize, sectorsize);
  56         if (buf == NULL)
  57                 goto gelierr;
  58         error = eli_metadata_decode(buf, &md);
  59         if (error)
  60                 goto gelierr;
  61
  62         if (strcmp(md.md_magic, G_ELI_MAGIC) == 0) {
  63                 free(buf);
  64                 return (0);
  65         }
  66
  67 gelierr:
  68         free(buf);
  69
  70         return (1);
  71 }