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
  74         if (volume_id_probe_lvm1(id, off) == 0)
  75                 goto found;
  76
  77         if (volume_id_probe_lvm2(id, off) == 0)
  78                 goto found;
  79
  80         if (volume_id_probe_highpoint_37x_raid(id, off) == 0)
  81                 goto found;
  82
  83         return -1;
  84
  85 found:
  86         /* If recognized, we free the allocated buffers */
  87         volume_id_free_buffer(id);
  88         return 0;
  89 }
  90
  91 int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size)
  92 {
  93         if (id == NULL)
  94                 return -EINVAL;
  95
  96         info("probing at offset 0x%llx, size 0x%llx",
  97             (unsigned long long) off, (unsigned long long) size);
  98
  99         if (volume_id_probe_luks(id, off) == 0)
 100                 goto found;
 101
 102         /* signature in the first block, only small buffer needed */
 103         if (volume_id_probe_vfat(id, off) == 0)
 104                 goto found;
 105
 106         if (volume_id_probe_xfs(id, off) == 0)
 107                 goto found;
 108
 109         /* fill buffer with maximum */
 110         volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 111
 112         if (volume_id_probe_linux_swap(id, off) == 0)
 113                 goto found;
 114
 115         if (volume_id_probe_ext(id, off) == 0)
 116                 goto found;
 117
 118         if (volume_id_probe_reiserfs(id, off) == 0)
 119                 goto found;
 120
 121         if (volume_id_probe_jfs(id, off) == 0)
 122                 goto found;
 123
 124         if (volume_id_probe_udf(id, off) == 0)
 125                 goto found;
 126
 127         if (volume_id_probe_iso9660(id, off) == 0)
 128                 goto found;
 129
 130         if (volume_id_probe_hfs_hfsplus(id, off) == 0)
 131                 goto found;
 132
 133         if (volume_id_probe_ufs(id, off) == 0)
 134                 goto found;
 135
 136         if (volume_id_probe_ntfs(id, off)  == 0)
 137                 goto found;
 138
 139         if (volume_id_probe_cramfs(id, off) == 0)
 140                 goto found;
 141
 142         if (volume_id_probe_romfs(id, off) == 0)
 143                 goto found;
 144
 145         if (volume_id_probe_hpfs(id, off) == 0)
 146                 goto found;
 147
 148         if (volume_id_probe_sysv(id, off) == 0)
 149                 goto found;
 150
 151         if (volume_id_probe_minix(id, off) == 0)
 152                 goto found;
 153
 154         if (volume_id_probe_ocfs1(id, off) == 0)
 155                 goto found;
 156
 157         if (volume_id_probe_ocfs2(id, off) == 0)
 158                 goto found;
 159
 160         if (volume_id_probe_vxfs(id, off) == 0)
 161                 goto found;
 162
 163         if (volume_id_probe_squashfs(id, off) == 0)
 164                 goto found;
 165
 166         return -1;
 167
 168 found:
 169         /* If recognized, we free the allocated buffers */
 170         volume_id_free_buffer(id);
 171         return 0;
 172 }
 173
 174 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
 175 {
 176         if (id == NULL)
 177                 return -EINVAL;
 178
 179         if (volume_id_probe_raid(id, off, size) == 0)
 180                 return 0;
 181
 182         if (volume_id_probe_filesystem(id, off, size) == 0)
 183                 return 0;
 184
 185         return -1;
 186 }
 187
 188 /* open volume by already open file descriptor */
 189 struct volume_id *volume_id_open_fd(int fd)
 190 {
 191         struct volume_id *id;
 192
 193         id = malloc(sizeof(struct volume_id));
 194         if (id == NULL)
 195                 return NULL;
 196         memset(id, 0x00, sizeof(struct volume_id));
 197
 198         id->fd = fd;
 199
 200         return id;
 201 }
 202
 203 /* open volume by device node */
 204 struct volume_id *volume_id_open_node(const char *path)
 205 {
 206         struct volume_id *id;
 207         int fd;
 208
 209         fd = open(path, O_RDONLY);
 210         if (fd < 0) {
 211                 dbg("unable to open '%s'", path);
 212                 return NULL;
 213         }
 214
 215         id = volume_id_open_fd(fd);
 216         if (id == NULL)
 217                 return NULL;
 218
 219         /* close fd on device close */
 220         id->fd_close = 1;
 221
 222         return id;
 223 }
 224
 225 void volume_id_close(struct volume_id *id)
 226 {
 227         if (id == NULL)
 228                 return;
 229
 230         if (id->fd_close != 0)
 231                 close(id->fd);
 232
 233         volume_id_free_buffer(id);
 234
 235         free(id);
 236 }