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