extras/volume_id/vol_id.c

   1 /*
   2  * vol_id - read filesystem label and uuid
   3  *
   4  * Copyright (C) 2005-2006 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  *      This program is distributed in the hope that it will be useful, but
  11  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *      General Public License for more details.
  14  *
  15  *      You should have received a copy of the GNU General Public License along
  16  *      with this program; if not, write to the Free Software Foundation, Inc.,
  17  *      675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21 #ifndef _GNU_SOURCE
  22 #define _GNU_SOURCE 1
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <grp.h>
  31 #include <sys/ioctl.h>
  32
  33 #include "../../udev.h"
  34 #include "lib/libvolume_id.h"
  35
  36 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
  37
  38 #ifdef USE_LOG
  39 void log_message(int priority, const char *format, ...)
  40 {
  41         va_list args;
  42         static int udev_log = -1;
  43
  44         if (udev_log == -1) {
  45                 const char *value;
  46
  47                 value = getenv("UDEV_LOG");
  48                 if (value)
  49                         udev_log = log_priority(value);
  50                 else
  51                         udev_log = LOG_ERR;
  52         }
  53
  54         if (priority > udev_log)
  55                 return;
  56
  57         va_start(args, format);
  58         vsyslog(priority, format, args);
  59         va_end(args);
  60 }
  61 #endif
  62
  63 static void vid_log(int priority, const char *file, int line, const char *format, ...)
  64 {
  65 #ifdef USE_LOG
  66         char log_str[1024];
  67         va_list args;
  68
  69         va_start(args, format);
  70         vsnprintf(log_str, sizeof(log_str), format, args);
  71         log_str[sizeof(log_str)-1] = '\0';
  72         log_message(priority, "%s:%i %s", file, line, log_str);
  73         va_end(args);
  74 #endif
  75         return;
  76 }
  77
  78 static void set_str(char *to, const char *from, size_t count)
  79 {
  80         size_t i, j, len;
  81
  82         /* strip trailing whitespace */
  83         len = strnlen(from, count);
  84         while (len && isspace(from[len-1]))
  85                 len--;
  86
  87         /* strip leading whitespace */
  88         i = 0;
  89         while (isspace(from[i]) && (i < len))
  90                 i++;
  91
  92         j = 0;
  93         while (i < len) {
  94                 /* substitute multiple whitespace */
  95                 if (isspace(from[i])) {
  96                         while (isspace(from[i]))
  97                                 i++;
  98                         to[j++] = '_';
  99                 }
 100                 /* skip chars */
 101                 if (from[i] == '/') {
 102                         i++;
 103                         continue;
 104                 }
 105                 to[j++] = from[i++];
 106         }
 107         to[j] = '\0';
 108 }
 109
 110 int main(int argc, char *argv[])
 111 {
 112         const char help[] = "Usage: vol_id [options] <device>\n"
 113                             " --export        export key/value pairs\n"
 114                             "  -t             filesystem type\n"
 115                             "  -l             filesystem label\n"
 116                             "  -u             filesystem uuid\n"
 117                             " --skip-raid     don't probe for raid\n"
 118                             " --probe-all     find possibly conflicting signatures\n"
 119                             " --help\n"
 120                             "\n";
 121         enum print_type {
 122                 PRINT_EXPORT,
 123                 PRINT_TYPE,
 124                 PRINT_LABEL,
 125                 PRINT_UUID,
 126         } print = PRINT_EXPORT;
 127         struct volume_id *vid = NULL;
 128         static char name[VOLUME_ID_LABEL_SIZE];
 129         int i;
 130         uint64_t size;
 131         int skip_raid = 0;
 132         int probe_all = 0;
 133         const char *node = NULL;
 134         uid_t nobody_uid;
 135         gid_t nobody_gid;
 136         int retval;
 137         int rc = 0;
 138
 139         logging_init("vol_id");
 140
 141         /* hook in our debug into libvolume_id */
 142         volume_id_log_fn = vid_log;
 143
 144         for (i = 1 ; i < argc; i++) {
 145                 char *arg = argv[i];
 146
 147                 if (strcmp(arg, "--export") == 0) {
 148                         print = PRINT_EXPORT;
 149                 } else if (strcmp(arg, "-t") == 0) {
 150                         print = PRINT_TYPE;
 151                 } else if (strcmp(arg, "-l") == 0) {
 152                         print = PRINT_LABEL;
 153                 } else if (strcmp(arg, "-u") == 0) {
 154                         print = PRINT_UUID;
 155                 } else if (strcmp(arg, "--skip-raid") == 0) {
 156                         skip_raid = 1;
 157                 } else if (strcmp(arg, "--probe-all") == 0) {
 158                         probe_all = 1;
 159                 } else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0) {
 160                         printf(help);
 161                         goto exit;
 162                 } else
 163                         node = arg;
 164         }
 165         if (!node) {
 166                 err("no node specified");
 167                 fprintf(stderr, help);
 168                 rc = 1;
 169                 goto exit;
 170         }
 171
 172         vid = volume_id_open_node(node);
 173         if (vid == NULL) {
 174                 fprintf(stderr, "%s: error open volume\n", node);
 175                 rc = 2;
 176                 goto exit;
 177         }
 178
 179         if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
 180                 size = 0;
 181         dbg("BLKGETSIZE64=%llu", size);
 182
 183         /* drop all privileges */
 184         nobody_uid = lookup_user("nobody");
 185         nobody_gid = lookup_group("nogroup");
 186         if (nobody_uid > 0 && nobody_gid > 0) {
 187                 if (setgroups(0, NULL) != 0 ||
 188                     setgid(nobody_gid) != 0 ||
 189                     setuid(nobody_uid) != 0) {
 190                         rc = 3;
 191                         goto exit;
 192                 }
 193         }
 194
 195         if (probe_all) {
 196                 if (volume_id_probe_linux_raid(vid, 0, size) == 0)
 197                         printf("%s\n", vid->type);
 198                 if (volume_id_probe_intel_software_raid(vid, 0, size) == 0)
 199                         printf("%s\n", vid->type);
 200                 if (volume_id_probe_lsi_mega_raid(vid, 0, size) == 0)
 201                         printf("%s\n", vid->type);
 202                 if (volume_id_probe_via_raid(vid, 0, size) == 0)
 203                         printf("%s\n", vid->type);
 204                 if (volume_id_probe_silicon_medley_raid(vid, 0, size) == 0)
 205                         printf("%s\n", vid->type);
 206                 if (volume_id_probe_nvidia_raid(vid, 0, size) == 0)
 207                         printf("%s\n", vid->type);
 208                 if (volume_id_probe_promise_fasttrack_raid(vid, 0, size) == 0)
 209                         printf("%s\n", vid->type);
 210                 if (volume_id_probe_highpoint_45x_raid(vid, 0, size) == 0)
 211                         printf("%s\n", vid->type);
 212                 if (volume_id_probe_adaptec_raid(vid, 0, size) == 0)
 213                         printf("%s\n", vid->type);
 214                 if (volume_id_probe_jmicron_raid(vid, 0, size) == 0)
 215                         printf("%s\n", vid->type);
 216                 if (volume_id_probe_vfat(vid, 0, 0) == 0)
 217                         printf("%s\n", vid->type);
 218                 if (volume_id_probe_linux_swap(vid, 0, 0) == 0)
 219                         printf("%s\n", vid->type);
 220                 if (volume_id_probe_luks(vid, 0, 0) == 0)
 221                         printf("%s\n", vid->type);
 222                 if (volume_id_probe_xfs(vid, 0, 0) == 0)
 223                         printf("%s\n", vid->type);
 224                 if (volume_id_probe_ext(vid, 0, 0) == 0)
 225                         printf("%s\n", vid->type);
 226                 if (volume_id_probe_reiserfs(vid, 0, 0) == 0)
 227                         printf("%s\n", vid->type);
 228                 if (volume_id_probe_jfs(vid, 0, 0) == 0)
 229                         printf("%s\n", vid->type);
 230                 if (volume_id_probe_udf(vid, 0, 0) == 0)
 231                         printf("%s\n", vid->type);
 232                 if (volume_id_probe_iso9660(vid, 0, 0) == 0)
 233                         printf("%s\n", vid->type);
 234                 if (volume_id_probe_hfs_hfsplus(vid, 0, 0) == 0)
 235                         printf("%s\n", vid->type);
 236                 if (volume_id_probe_ufs(vid, 0, 0) == 0)
 237                         printf("%s\n", vid->type);
 238                 if (volume_id_probe_ntfs(vid, 0, 0)  == 0)
 239                         printf("%s\n", vid->type);
 240                 if (volume_id_probe_cramfs(vid, 0, 0) == 0)
 241                         printf("%s\n", vid->type);
 242                 if (volume_id_probe_romfs(vid, 0, 0) == 0)
 243                         printf("%s\n", vid->type);
 244                 if (volume_id_probe_hpfs(vid, 0, 0) == 0)
 245                         printf("%s\n", vid->type);
 246                 if (volume_id_probe_sysv(vid, 0, 0) == 0)
 247                         printf("%s\n", vid->type);
 248                 if (volume_id_probe_minix(vid, 0, 0) == 0)
 249                         printf("%s\n", vid->type);
 250                 if (volume_id_probe_ocfs1(vid, 0, 0) == 0)
 251                         printf("%s\n", vid->type);
 252                 if (volume_id_probe_ocfs2(vid, 0, 0) == 0)
 253                         printf("%s\n", vid->type);
 254                 if (volume_id_probe_vxfs(vid, 0, 0) == 0)
 255                         printf("%s\n", vid->type);
 256                 if (volume_id_probe_squashfs(vid, 0, 0) == 0)
 257                         printf("%s\n", vid->type);
 258                 if (volume_id_probe_netware(vid, 0, 0) == 0)
 259                         printf("%s\n", vid->type);
 260                 if (volume_id_probe_gfs(vid, 0, 0) == 0)
 261                         printf("%s\n", vid->type);
 262                 if (volume_id_probe_gfs2(vid, 0, 0) == 0)
 263                         printf("%s\n", vid->type);
 264
 265                 goto exit;
 266         }
 267
 268         if (skip_raid)
 269                 retval = volume_id_probe_filesystem(vid, 0, size);
 270         else
 271                 retval = volume_id_probe_all(vid, 0, size);
 272         if (retval != 0) {
 273                 fprintf(stderr, "%s: unknown volume type\n", node);
 274                 rc = 4;
 275                 goto exit;
 276         }
 277
 278         set_str(name, vid->label, sizeof(vid->label));
 279         replace_untrusted_chars(name);
 280
 281         switch (print) {
 282         case PRINT_EXPORT:
 283                 printf("ID_FS_USAGE=%s\n", vid->usage);
 284                 printf("ID_FS_TYPE=%s\n", vid->type);
 285                 printf("ID_FS_VERSION=%s\n", vid->type_version);
 286                 printf("ID_FS_UUID=%s\n", vid->uuid);
 287                 printf("ID_FS_LABEL=%s\n", vid->label);
 288                 printf("ID_FS_LABEL_SAFE=%s\n", name);
 289                 break;
 290         case PRINT_TYPE:
 291                 printf("%s\n", vid->type);
 292                 break;
 293         case PRINT_LABEL:
 294                 if (name[0] == '\0' || vid->usage_id == VOLUME_ID_RAID) {
 295                         rc = 3;
 296                         goto exit;
 297                 }
 298                 printf("%s\n", name);
 299                 break;
 300         case PRINT_UUID:
 301                 if (vid->uuid[0] == '\0' || vid->usage_id == VOLUME_ID_RAID) {
 302                         rc = 4;
 303                         goto exit;
 304                 }
 305                 printf("%s\n", vid->uuid);
 306                 break;
 307         }
 308
 309 exit:
 310         if (vid != NULL)
 311                 volume_id_close(vid);
 312
 313         logging_close();
 314         return rc;
 315 }