extras/volume_id/lib/volume_id.c

   1 /*
   2  * volume_id - reads volume 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 <ctype.h>
  25 #include <fcntl.h>
  26 #include <sys/stat.h>
  27
  28 #include "libvolume_id.h"
  29 #include "util.h"
  30
  31 /* the user can overwrite this log function */
  32 static void default_log(int priority, const char *file, int line, const char *format, ...)
  33 {
  34         return;
  35 }
  36
  37 volume_id_log_fn_t volume_id_log_fn = default_log;
  38
  39 int volume_id_probe_raid(struct volume_id *id, uint64_t off, uint64_t size)
  40 {
  41         if (id == NULL)
  42                 return -EINVAL;
  43
  44         info("probing at offset 0x%llx, size 0x%llx",
  45             (unsigned long long) off, (unsigned long long) size);
  46
  47         /* probe for raid first, because fs probes may be successful on raid members */
  48         if (size) {
  49                 if (volume_id_probe_linux_raid(id, off, size) == 0)
  50                         goto found;
  51
  52                 if (volume_id_probe_intel_software_raid(id, off, size) == 0)
  53                         goto found;
  54
  55                 if (volume_id_probe_lsi_mega_raid(id, off, size) == 0)
  56                         goto found;
  57
  58                 if (volume_id_probe_via_raid(id, off, size) == 0)
  59                         goto found;
  60
  61                 if (volume_id_probe_silicon_medley_raid(id, off, size) == 0)
  62                         goto found;
  63
  64                 if (volume_id_probe_nvidia_raid(id, off, size) == 0)
  65                         goto found;
  66
  67                 if (volume_id_probe_promise_fasttrack_raid(id, off, size) == 0)
  68                         goto found;
  69
  70                 if (volume_id_probe_highpoint_45x_raid(id, off, size) == 0)
  71                         goto found;
  72
  73                 if (volume_id_probe_adaptec_raid(id, off, size) == 0)
  74                         goto found;
  75
  76                 if (volume_id_probe_jmicron_raid(id, off, size) == 0)
  77                         goto found;
  78         }
  79
  80         if (volume_id_probe_lvm1(id, off) == 0)
  81                 goto found;
  82
  83         if (volume_id_probe_lvm2(id, off) == 0)
  84                 goto found;
  85
  86         if (volume_id_probe_highpoint_37x_raid(id, off) == 0)
  87                 goto found;
  88
  89         return -1;
  90
  91 found:
  92         /* If recognized, we free the allocated buffers */
  93         volume_id_free_buffer(id);
  94         return 0;
  95 }
  96
  97 int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size)
  98 {
  99         if (id == NULL)
 100                 return -EINVAL;
 101
 102         info("probing at offset 0x%llx, size 0x%llx",
 103             (unsigned long long) off, (unsigned long long) size);
 104
 105         if (volume_id_probe_vfat(id, off) == 0)
 106                 goto found;
 107
 108         /* fill buffer with maximum */
 109         volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 110
 111         if (volume_id_probe_linux_swap(id, off) == 0)
 112                 goto found;
 113
 114         if (volume_id_probe_luks(id, off) == 0)
 115                 goto found;
 116
 117         if (volume_id_probe_xfs(id, off) == 0)
 118                 goto found;
 119
 120         if (volume_id_probe_ext(id, off) == 0)
 121                 goto found;
 122
 123         if (volume_id_probe_reiserfs(id, off) == 0)
 124                 goto found;
 125
 126         if (volume_id_probe_jfs(id, off) == 0)
 127                 goto found;
 128
 129         if (volume_id_probe_udf(id, off) == 0)
 130                 goto found;
 131
 132         if (volume_id_probe_iso9660(id, off) == 0)
 133                 goto found;
 134
 135         if (volume_id_probe_hfs_hfsplus(id, off) == 0)
 136                 goto found;
 137
 138         if (volume_id_probe_ufs(id, off) == 0)
 139                 goto found;
 140
 141         if (volume_id_probe_ntfs(id, off)  == 0)
 142                 goto found;
 143
 144         if (volume_id_probe_cramfs(id, off) == 0)
 145                 goto found;
 146
 147         if (volume_id_probe_romfs(id, off) == 0)
 148                 goto found;
 149
 150         if (volume_id_probe_hpfs(id, off) == 0)
 151                 goto found;
 152
 153         if (volume_id_probe_sysv(id, off) == 0)
 154                 goto found;
 155
 156         if (volume_id_probe_minix(id, off) == 0)
 157                 goto found;
 158
 159         if (volume_id_probe_ocfs1(id, off) == 0)
 160                 goto found;
 161
 162         if (volume_id_probe_ocfs2(id, off) == 0)
 163                 goto found;
 164
 165         if (volume_id_probe_vxfs(id, off) == 0)
 166                 goto found;
 167
 168         if (volume_id_probe_squashfs(id, off) == 0)
 169                 goto found;
 170
 171         if (volume_id_probe_netware(id, off) == 0)
 172                 goto found;
 173
 174         if (volume_id_probe_gfs(id, off) == 0)
 175                 goto found;
 176
 177         if (volume_id_probe_gfs2(id, off) == 0)
 178                 goto found;
 179
 180         return -1;
 181
 182 found:
 183         /* If recognized, we free the allocated buffers */
 184         volume_id_free_buffer(id);
 185         return 0;
 186 }
 187
 188 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
 189 {
 190         if (id == NULL)
 191                 return -EINVAL;
 192
 193         if (volume_id_probe_raid(id, off, size) == 0)
 194                 return 0;
 195
 196         if (volume_id_probe_filesystem(id, off, size) == 0)
 197                 return 0;
 198
 199         return -1;
 200 }
 201
 202 /* open volume by already open file descriptor */
 203 struct volume_id *volume_id_open_fd(int fd)
 204 {
 205         struct volume_id *id;
 206
 207         id = malloc(sizeof(struct volume_id));
 208         if (id == NULL)
 209                 return NULL;
 210         memset(id, 0x00, sizeof(struct volume_id));
 211
 212         id->fd = fd;
 213
 214         return id;
 215 }
 216
 217 /* open volume by device node */
 218 struct volume_id *volume_id_open_node(const char *path)
 219 {
 220         struct volume_id *id;
 221         int fd;
 222
 223         fd = open(path, O_RDONLY);
 224         if (fd < 0) {
 225                 dbg("unable to open '%s'", path);
 226                 return NULL;
 227         }
 228
 229         id = volume_id_open_fd(fd);
 230         if (id == NULL)
 231                 return NULL;
 232
 233         /* close fd on device close */
 234         id->fd_close = 1;
 235
 236         return id;
 237 }
 238
 239 void volume_id_close(struct volume_id *id)
 240 {
 241         if (id == NULL)
 242                 return;
 243
 244         if (id->fd_close != 0)
 245                 close(id->fd);
 246
 247         volume_id_free_buffer(id);
 248
 249         free(id);
 250 }