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         if (volume_id_probe_vfat(id, off) == 0)
 103                 goto found;
 104
 105         if (volume_id_probe_xfs(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_ext(id, off) == 0)
 115                 goto found;
 116
 117         if (volume_id_probe_reiserfs(id, off) == 0)
 118                 goto found;
 119
 120         if (volume_id_probe_jfs(id, off) == 0)
 121                 goto found;
 122
 123         if (volume_id_probe_udf(id, off) == 0)
 124                 goto found;
 125
 126         if (volume_id_probe_iso9660(id, off) == 0)
 127                 goto found;
 128
 129         if (volume_id_probe_hfs_hfsplus(id, off) == 0)
 130                 goto found;
 131
 132         if (volume_id_probe_ufs(id, off) == 0)
 133                 goto found;
 134
 135         if (volume_id_probe_ntfs(id, off)  == 0)
 136                 goto found;
 137
 138         if (volume_id_probe_cramfs(id, off) == 0)
 139                 goto found;
 140
 141         if (volume_id_probe_romfs(id, off) == 0)
 142                 goto found;
 143
 144         if (volume_id_probe_hpfs(id, off) == 0)
 145                 goto found;
 146
 147         if (volume_id_probe_sysv(id, off) == 0)
 148                 goto found;
 149
 150         if (volume_id_probe_minix(id, off) == 0)
 151                 goto found;
 152
 153         if (volume_id_probe_ocfs1(id, off) == 0)
 154                 goto found;
 155
 156         if (volume_id_probe_ocfs2(id, off) == 0)
 157                 goto found;
 158
 159         if (volume_id_probe_vxfs(id, off) == 0)
 160                 goto found;
 161
 162         if (volume_id_probe_squashfs(id, off) == 0)
 163                 goto found;
 164
 165         if (volume_id_probe_netware(id, off) == 0)
 166                 goto found;
 167
 168         return -1;
 169
 170 found:
 171         /* If recognized, we free the allocated buffers */
 172         volume_id_free_buffer(id);
 173         return 0;
 174 }
 175
 176 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
 177 {
 178         if (id == NULL)
 179                 return -EINVAL;
 180
 181         if (volume_id_probe_raid(id, off, size) == 0)
 182                 return 0;
 183
 184         if (volume_id_probe_filesystem(id, off, size) == 0)
 185                 return 0;
 186
 187         return -1;
 188 }
 189
 190 /* open volume by already open file descriptor */
 191 struct volume_id *volume_id_open_fd(int fd)
 192 {
 193         struct volume_id *id;
 194
 195         id = malloc(sizeof(struct volume_id));
 196         if (id == NULL)
 197                 return NULL;
 198         memset(id, 0x00, sizeof(struct volume_id));
 199
 200         id->fd = fd;
 201
 202         return id;
 203 }
 204
 205 /* open volume by device node */
 206 struct volume_id *volume_id_open_node(const char *path)
 207 {
 208         struct volume_id *id;
 209         int fd;
 210
 211         fd = open(path, O_RDONLY);
 212         if (fd < 0) {
 213                 dbg("unable to open '%s'", path);
 214                 return NULL;
 215         }
 216
 217         id = volume_id_open_fd(fd);
 218         if (id == NULL)
 219                 return NULL;
 220
 221         /* close fd on device close */
 222         id->fd_close = 1;
 223
 224         return id;
 225 }
 226
 227 void volume_id_close(struct volume_id *id)
 228 {
 229         if (id == NULL)
 230                 return;
 231
 232         if (id->fd_close != 0)
 233                 close(id->fd);
 234
 235         volume_id_free_buffer(id);
 236
 237         free(id);
 238 }