extras/volume_id/libvolume_id/volume_id.c

   1 /*
   2  * volume_id - reads filesystem label and uuid
   3  *
   4  * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  */
  10
  11 #ifndef _GNU_SOURCE
  12 #define _GNU_SOURCE 1
  13 #endif
  14
  15 #ifdef HAVE_CONFIG_H
  16 #  include <config.h>
  17 #endif
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <string.h>
  23 #include <errno.h>
  24 #include <errno.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <sys/stat.h>
  28
  29 #include "volume_id.h"
  30 #include "logging.h"
  31 #include "util.h"
  32
  33
  34 int volume_id_probe_raid(struct volume_id *id, uint64_t off, uint64_t size)
  35 {
  36         if (id == NULL)
  37                 return -EINVAL;
  38
  39         /* probe for raid first, cause fs probes may be successful on raid members */
  40         if (size) {
  41                 if (volume_id_probe_linux_raid(id, off, size) == 0)
  42                         goto found;
  43
  44                 if (volume_id_probe_intel_software_raid(id, off, size) == 0)
  45                         goto found;
  46
  47                 if (volume_id_probe_lsi_mega_raid(id, off, size) == 0)
  48                         goto found;
  49
  50                 if (volume_id_probe_via_raid(id, off, size) == 0)
  51                         goto found;
  52
  53                 if (volume_id_probe_silicon_medley_raid(id, off, size) == 0)
  54                         goto found;
  55
  56                 if (volume_id_probe_nvidia_raid(id, off, size) == 0)
  57                         goto found;
  58
  59                 if (volume_id_probe_promise_fasttrack_raid(id, off, size) == 0)
  60                         goto found;
  61
  62                 if (volume_id_probe_highpoint_45x_raid(id, off, size) == 0)
  63                         goto found;
  64         }
  65
  66         if (volume_id_probe_lvm1(id, off) == 0)
  67                 goto found;
  68
  69         if (volume_id_probe_lvm2(id, off) == 0)
  70                 goto found;
  71
  72         if (volume_id_probe_highpoint_37x_raid(id, off) == 0)
  73                 goto found;
  74
  75         return -1;
  76
  77 found:
  78         /* If recognized, we free the allocated buffers */
  79         volume_id_free_buffer(id);
  80         return 0;
  81 }
  82
  83 int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size)
  84 {
  85         if (id == NULL)
  86                 return -EINVAL;
  87
  88         if (volume_id_probe_luks(id, off) == 0)
  89                 goto found;
  90
  91         /* signature in the first block, only small buffer needed */
  92         if (volume_id_probe_vfat(id, off) == 0)
  93                 goto found;
  94
  95         if (volume_id_probe_xfs(id, off) == 0)
  96                 goto found;
  97
  98         /* fill buffer with maximum */
  99         volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 100
 101         if (volume_id_probe_linux_swap(id, off) == 0)
 102                 goto found;
 103
 104         if (volume_id_probe_ext(id, off) == 0)
 105                 goto found;
 106
 107         if (volume_id_probe_reiserfs(id, off) == 0)
 108                 goto found;
 109
 110         if (volume_id_probe_jfs(id, off) == 0)
 111                 goto found;
 112
 113         if (volume_id_probe_udf(id, off) == 0)
 114                 goto found;
 115
 116         if (volume_id_probe_iso9660(id, off) == 0)
 117                 goto found;
 118
 119         if (volume_id_probe_hfs_hfsplus(id, off) == 0)
 120                 goto found;
 121
 122         if (volume_id_probe_ufs(id, off) == 0)
 123                 goto found;
 124
 125         if (volume_id_probe_ntfs(id, off)  == 0)
 126                 goto found;
 127
 128         if (volume_id_probe_cramfs(id, off) == 0)
 129                 goto found;
 130
 131         if (volume_id_probe_romfs(id, off) == 0)
 132                 goto found;
 133
 134         if (volume_id_probe_hpfs(id, off) == 0)
 135                 goto found;
 136
 137         if (volume_id_probe_sysv(id, off) == 0)
 138                 goto found;
 139
 140         if (volume_id_probe_minix(id, off) == 0)
 141                 goto found;
 142
 143         if (volume_id_probe_ocfs1(id, off) == 0)
 144                 goto found;
 145
 146         if (volume_id_probe_ocfs2(id, off) == 0)
 147                 goto found;
 148
 149         if (volume_id_probe_vxfs(id, off) == 0)
 150                 goto found;
 151
 152         if (volume_id_probe_squashfs(id, off) == 0)
 153                 goto found;
 154
 155         return -1;
 156
 157 found:
 158         /* If recognized, we free the allocated buffers */
 159         volume_id_free_buffer(id);
 160         return 0;
 161 }
 162
 163 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
 164 {
 165         if (id == NULL)
 166                 return -EINVAL;
 167
 168         if (volume_id_probe_raid(id, off, size) == 0)
 169                 return 0;
 170
 171         if (volume_id_probe_filesystem(id, off, size) == 0)
 172                 return 0;
 173
 174         return -1;
 175 }
 176
 177 /* open volume by already open file descriptor */
 178 struct volume_id *volume_id_open_fd(int fd)
 179 {
 180         struct volume_id *id;
 181
 182         id = malloc(sizeof(struct volume_id));
 183         if (id == NULL)
 184                 return NULL;
 185         memset(id, 0x00, sizeof(struct volume_id));
 186
 187         id->fd = fd;
 188
 189         return id;
 190 }
 191
 192 /* open volume by device node */
 193 struct volume_id *volume_id_open_node(const char *path)
 194 {
 195         struct volume_id *id;
 196         int fd;
 197
 198         fd = open(path, O_RDONLY);
 199         if (fd < 0) {
 200                 dbg("unable to open '%s'", path);
 201                 return NULL;
 202         }
 203
 204         id = volume_id_open_fd(fd);
 205         if (id == NULL)
 206                 return NULL;
 207
 208         /* close fd on device close */
 209         id->fd_close = 1;
 210
 211         return id;
 212 }
 213
 214 void volume_id_close(struct volume_id *id)
 215 {
 216         if (id == NULL)
 217                 return;
 218
 219         if (id->fd_close != 0)
 220                 close(id->fd);
 221
 222         volume_id_free_buffer(id);
 223
 224         if (id->partitions != NULL)
 225                 free(id->partitions);
 226
 227         free(id);
 228 }