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_luks(id, off) == 0)
 106                 goto found;
 107
 108         if (volume_id_probe_vfat(id, off) == 0)
 109                 goto found;
 110
 111         if (volume_id_probe_xfs(id, off) == 0)
 112                 goto found;
 113
 114         /* fill buffer with maximum */
 115         volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 116
 117         if (volume_id_probe_linux_swap(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         return -1;
 175
 176 found:
 177         /* If recognized, we free the allocated buffers */
 178         volume_id_free_buffer(id);
 179         return 0;
 180 }
 181
 182 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
 183 {
 184         if (id == NULL)
 185                 return -EINVAL;
 186
 187         if (volume_id_probe_raid(id, off, size) == 0)
 188                 return 0;
 189
 190         if (volume_id_probe_filesystem(id, off, size) == 0)
 191                 return 0;
 192
 193         return -1;
 194 }
 195
 196 /* open volume by already open file descriptor */
 197 struct volume_id *volume_id_open_fd(int fd)
 198 {
 199         struct volume_id *id;
 200
 201         id = malloc(sizeof(struct volume_id));
 202         if (id == NULL)
 203                 return NULL;
 204         memset(id, 0x00, sizeof(struct volume_id));
 205
 206         id->fd = fd;
 207
 208         return id;
 209 }
 210
 211 /* open volume by device node */
 212 struct volume_id *volume_id_open_node(const char *path)
 213 {
 214         struct volume_id *id;
 215         int fd;
 216
 217         fd = open(path, O_RDONLY);
 218         if (fd < 0) {
 219                 dbg("unable to open '%s'", path);
 220                 return NULL;
 221         }
 222
 223         id = volume_id_open_fd(fd);
 224         if (id == NULL)
 225                 return NULL;
 226
 227         /* close fd on device close */
 228         id->fd_close = 1;
 229
 230         return id;
 231 }
 232
 233 void volume_id_close(struct volume_id *id)
 234 {
 235         if (id == NULL)
 236                 return;
 237
 238         if (id->fd_close != 0)
 239                 close(id->fd);
 240
 241         volume_id_free_buffer(id);
 242
 243         free(id);
 244 }