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 <errno.h>
  31 #include <pwd.h>
  32 #include <grp.h>
  33 #include <getopt.h>
  34 #include <fcntl.h>
  35 #include <sys/ioctl.h>
  36
  37 #include "../../udev.h"
  38 #include "lib/libvolume_id.h"
  39
  40 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
  41
  42 #ifdef USE_LOG
  43 void log_message(int priority, const char *format, ...)
  44 {
  45         va_list args;
  46         static int udev_log = -1;
  47
  48         if (udev_log == -1) {
  49                 const char *value;
  50
  51                 value = getenv("UDEV_LOG");
  52                 if (value)
  53                         udev_log = log_priority(value);
  54                 else
  55                         udev_log = LOG_ERR;
  56         }
  57
  58         if (priority > udev_log)
  59                 return;
  60
  61         va_start(args, format);
  62         vsyslog(priority, format, args);
  63         va_end(args);
  64 }
  65 #endif
  66
  67 static void vid_log(int priority, const char *file, int line, const char *format, ...)
  68 {
  69 #ifdef USE_LOG
  70         char log_str[1024];
  71         va_list args;
  72
  73         va_start(args, format);
  74         vsnprintf(log_str, sizeof(log_str), format, args);
  75         log_str[sizeof(log_str)-1] = '\0';
  76         log_message(priority, "%s:%i %s", file, line, log_str);
  77         va_end(args);
  78 #endif
  79         return;
  80 }
  81
  82 static void set_str(char *to, const char *from, size_t count)
  83 {
  84         size_t i, j, len;
  85
  86         /* strip trailing whitespace */
  87         len = strnlen(from, count);
  88         while (len && isspace(from[len-1]))
  89                 len--;
  90
  91         /* strip leading whitespace */
  92         i = 0;
  93         while (isspace(from[i]) && (i < len))
  94                 i++;
  95
  96         j = 0;
  97         while (i < len) {
  98                 /* substitute multiple whitespace */
  99                 if (isspace(from[i])) {
 100                         while (isspace(from[i]))
 101                                 i++;
 102                         to[j++] = '_';
 103                 }
 104                 /* skip chars */
 105                 if (from[i] == '/') {
 106                         i++;
 107                         continue;
 108                 }
 109                 to[j++] = from[i++];
 110         }
 111         to[j] = '\0';
 112 }
 113
 114 int main(int argc, char *argv[])
 115 {
 116         static const struct option options[] = {
 117                 { "label", 0, NULL, 'l' },
 118                 { "label-raw", 0, NULL, 'L' },
 119                 { "uuid", 0, NULL, 'u' },
 120                 { "type", 0, NULL, 't' },
 121                 { "export", 0, NULL, 'x' },
 122                 { "skip-raid", 0, NULL, 's' },
 123                 { "probe-all", 0, NULL, 'a' },
 124                 { "help", 0, NULL, 'h' },
 125                 {}
 126         };
 127
 128         enum print_type {
 129                 PRINT_EXPORT,
 130                 PRINT_TYPE,
 131                 PRINT_LABEL,
 132                 PRINT_UUID,
 133                 PRINT_LABEL_RAW,
 134         } print = PRINT_EXPORT;
 135
 136         struct volume_id *vid = NULL;
 137         char name[128];
 138         uint64_t size;
 139         int skip_raid = 0;
 140         int probe_all = 0;
 141         const char *node;
 142         struct passwd *pw;
 143         int fd;
 144         const char *label, *uuid, *type, *type_version, *usage;
 145         int retval;
 146         int rc = 0;
 147
 148         logging_init("vol_id");
 149
 150         /* hook in our debug into libvolume_id */
 151         volume_id_log_fn = vid_log;
 152
 153         while (1) {
 154                 int option;
 155
 156                 option = getopt_long(argc, argv, "lLutxsah", options, NULL);
 157                 if (option == -1)
 158                         break;
 159
 160                 switch (option) {
 161                 case 'l':
 162                         print = PRINT_LABEL;
 163                         break;
 164                 case 'L':
 165                         print = PRINT_LABEL_RAW;
 166                         break;
 167                 case 'u':
 168                         print = PRINT_UUID;
 169                         break;
 170                 case 't':
 171                         print = PRINT_TYPE;
 172                         break;
 173                 case 'x':
 174                         print = PRINT_EXPORT;
 175                         break;
 176                 case 's':
 177                         skip_raid = 1;
 178                         break;
 179                 case 'a':
 180                         probe_all = 1;
 181                         break;
 182                 case 'h':
 183                         printf("Usage: vol_id [options] <device>\n"
 184                             " --export        export key/value pairs\n"
 185                             " --type          filesystem type\n"
 186                             " --label         filesystem label\n"
 187                             " --label-raw     raw label\n"
 188                             " --uuid          filesystem uuid\n"
 189                             " --skip-raid     don't probe for raid\n"
 190                             " --probe-all     find possibly conflicting signatures\n"
 191                             " --help\n\n");
 192                         goto exit;
 193                 default:
 194                         retval = 1;
 195                         goto exit;
 196                 }
 197         }
 198
 199         node = argv[optind];
 200         if (!node) {
 201                 err("no device");
 202                 fprintf(stderr, "no device\n");
 203                 rc = 1;
 204                 goto exit;
 205         }
 206
 207         fd = open(node, O_RDONLY);
 208         if (fd < 0) {
 209                 fprintf(stderr, "%s: error opening volume\n", node);
 210                 rc = 2;
 211                 goto exit;
 212         }
 213
 214         vid = volume_id_open_fd(fd);
 215         if (vid == NULL) {
 216                 rc = 2;
 217                 goto exit;
 218         }
 219
 220         if (ioctl(fd, BLKGETSIZE64, &size) != 0)
 221                 size = 0;
 222         dbg("BLKGETSIZE64=%llu", (unsigned long long)size);
 223
 224         /* try to drop all privileges before reading disk content */
 225         pw = getpwnam ("nobody");
 226         if (pw != NULL && pw->pw_uid > 0 && pw->pw_gid > 0) {
 227                 dbg("dropping privileges to %u:%u",
 228                     (unsigned int)pw->pw_uid, (unsigned int)pw->pw_gid);
 229                 if (setgroups(0, NULL) != 0 ||
 230                     setgid(pw->pw_gid) != 0 ||
 231                     setuid(pw->pw_uid) != 0) {
 232                         fprintf(stderr, "error dropping privileges: %s\n", strerror(errno));
 233                         rc = 3;
 234                         goto exit;
 235                 }
 236         }
 237
 238         if (probe_all) {
 239                 if (volume_id_probe_linux_raid(vid, 0, size) == 0)
 240                         if (volume_id_get_type(vid, &type))
 241                                 printf("%s\n", type);
 242                 if (volume_id_probe_intel_software_raid(vid, 0, size) == 0)
 243                         if (volume_id_get_type(vid, &type))
 244                                 printf("%s\n", type);
 245                 if (volume_id_probe_lsi_mega_raid(vid, 0, size) == 0)
 246                         if (volume_id_get_type(vid, &type))
 247                                 printf("%s\n", type);
 248                 if (volume_id_probe_via_raid(vid, 0, size) == 0)
 249                         if (volume_id_get_type(vid, &type))
 250                                 printf("%s\n", type);
 251                 if (volume_id_probe_silicon_medley_raid(vid, 0, size) == 0)
 252                         if (volume_id_get_type(vid, &type))
 253                                 printf("%s\n", type);
 254                 if (volume_id_probe_nvidia_raid(vid, 0, size) == 0)
 255                         if (volume_id_get_type(vid, &type))
 256                                 printf("%s\n", type);
 257                 if (volume_id_probe_promise_fasttrack_raid(vid, 0, size) == 0)
 258                         if (volume_id_get_type(vid, &type))
 259                                 printf("%s\n", type);
 260                 if (volume_id_probe_highpoint_45x_raid(vid, 0, size) == 0)
 261                         if (volume_id_get_type(vid, &type))
 262                                 printf("%s\n", type);
 263                 if (volume_id_probe_adaptec_raid(vid, 0, size) == 0)
 264                         if (volume_id_get_type(vid, &type))
 265                                 printf("%s\n", type);
 266                 if (volume_id_probe_jmicron_raid(vid, 0, size) == 0)
 267                         if (volume_id_get_type(vid, &type))
 268                                 printf("%s\n", type);
 269                 if (volume_id_probe_vfat(vid, 0, 0) == 0)
 270                         if (volume_id_get_type(vid, &type))
 271                                 printf("%s\n", type);
 272                 if (volume_id_probe_linux_swap(vid, 0, 0) == 0)
 273                         if (volume_id_get_type(vid, &type))
 274                                 printf("%s\n", type);
 275                 if (volume_id_probe_luks(vid, 0, 0) == 0)
 276                         if (volume_id_get_type(vid, &type))
 277                                 printf("%s\n", type);
 278                 if (volume_id_probe_xfs(vid, 0, 0) == 0)
 279                         if (volume_id_get_type(vid, &type))
 280                                 printf("%s\n", type);
 281                 if (volume_id_probe_ext(vid, 0, 0) == 0)
 282                         if (volume_id_get_type(vid, &type))
 283                                 printf("%s\n", type);
 284                 if (volume_id_probe_reiserfs(vid, 0, 0) == 0)
 285                         if (volume_id_get_type(vid, &type))
 286                                 printf("%s\n", type);
 287                 if (volume_id_probe_jfs(vid, 0, 0) == 0)
 288                         if (volume_id_get_type(vid, &type))
 289                                 printf("%s\n", type);
 290                 if (volume_id_probe_udf(vid, 0, 0) == 0)
 291                         if (volume_id_get_type(vid, &type))
 292                                 printf("%s\n", type);
 293                 if (volume_id_probe_iso9660(vid, 0, 0) == 0)
 294                         if (volume_id_get_type(vid, &type))
 295                                 printf("%s\n", type);
 296                 if (volume_id_probe_hfs_hfsplus(vid, 0, 0) == 0)
 297                         if (volume_id_get_type(vid, &type))
 298                                 printf("%s\n", type);
 299                 if (volume_id_probe_ufs(vid, 0, 0) == 0)
 300                         if (volume_id_get_type(vid, &type))
 301                                 printf("%s\n", type);
 302                 if (volume_id_probe_ntfs(vid, 0, 0)  == 0)
 303                         if (volume_id_get_type(vid, &type))
 304                                 printf("%s\n", type);
 305                 if (volume_id_probe_cramfs(vid, 0, 0) == 0)
 306                         if (volume_id_get_type(vid, &type))
 307                                 printf("%s\n", type);
 308                 if (volume_id_probe_romfs(vid, 0, 0) == 0)
 309                         if (volume_id_get_type(vid, &type))
 310                                 printf("%s\n", type);
 311                 if (volume_id_probe_hpfs(vid, 0, 0) == 0)
 312                         if (volume_id_get_type(vid, &type))
 313                                 printf("%s\n", type);
 314                 if (volume_id_probe_sysv(vid, 0, 0) == 0)
 315                         if (volume_id_get_type(vid, &type))
 316                                 printf("%s\n", type);
 317                 if (volume_id_probe_minix(vid, 0, 0) == 0)
 318                         if (volume_id_get_type(vid, &type))
 319                                 printf("%s\n", type);
 320                 if (volume_id_probe_ocfs1(vid, 0, 0) == 0)
 321                         if (volume_id_get_type(vid, &type))
 322                                 printf("%s\n", type);
 323                 if (volume_id_probe_ocfs2(vid, 0, 0) == 0)
 324                         if (volume_id_get_type(vid, &type))
 325                                 printf("%s\n", type);
 326                 if (volume_id_probe_vxfs(vid, 0, 0) == 0)
 327                         if (volume_id_get_type(vid, &type))
 328                                 printf("%s\n", type);
 329                 if (volume_id_probe_squashfs(vid, 0, 0) == 0)
 330                         if (volume_id_get_type(vid, &type))
 331                                 printf("%s\n", type);
 332                 if (volume_id_probe_netware(vid, 0, 0) == 0)
 333                         if (volume_id_get_type(vid, &type))
 334                                 printf("%s\n", type);
 335                 if (volume_id_probe_gfs(vid, 0, 0) == 0)
 336                         if (volume_id_get_type(vid, &type))
 337                                 printf("%s\n", type);
 338                 if (volume_id_probe_gfs2(vid, 0, 0) == 0)
 339                         if (volume_id_get_type(vid, &type))
 340                                 printf("%s\n", type);
 341                 goto exit;
 342         }
 343
 344         if (skip_raid)
 345                 retval = volume_id_probe_filesystem(vid, 0, size);
 346         else
 347                 retval = volume_id_probe_all(vid, 0, size);
 348         if (retval != 0) {
 349                 fprintf(stderr, "%s: unknown volume type\n", node);
 350                 rc = 4;
 351                 goto exit;
 352         }
 353
 354         if (!volume_id_get_label(vid, &label) ||
 355             !volume_id_get_usage(vid, &usage) ||
 356             !volume_id_get_type(vid, &type) ||
 357             !volume_id_get_type_version(vid, &type_version) ||
 358             !volume_id_get_uuid(vid, &uuid)) {
 359                 rc = 4;
 360                 goto exit;
 361         }
 362         set_str(name, label, sizeof(name));
 363         replace_untrusted_chars(name);
 364
 365         switch (print) {
 366         case PRINT_EXPORT:
 367                 printf("ID_FS_USAGE=%s\n", usage);
 368                 printf("ID_FS_TYPE=%s\n", type);
 369                 printf("ID_FS_VERSION=%s\n", type_version);
 370                 printf("ID_FS_UUID=%s\n", uuid);
 371                 printf("ID_FS_LABEL=%s\n", label);
 372                 printf("ID_FS_LABEL_SAFE=%s\n", name);
 373                 break;
 374         case PRINT_TYPE:
 375                 printf("%s\n", type);
 376                 break;
 377         case PRINT_LABEL:
 378                 if (name[0] == '\0' || strcmp(usage, "raid") == 0) {
 379                         rc = 3;
 380                         goto exit;
 381                 }
 382                 printf("%s\n", name);
 383                 break;
 384         case PRINT_UUID:
 385                 if (uuid[0] == '\0' || strcmp(usage, "raid") == 0) {
 386                         rc = 4;
 387                         goto exit;
 388                 }
 389                 printf("%s\n", uuid);
 390                 break;
 391         case PRINT_LABEL_RAW:
 392                 if (label[0] == '\0' || strcmp(usage, "raid") == 0) {
 393                         rc = 3;
 394                         goto exit;
 395                 }
 396                 printf("%s\n", label);
 397                 break;
 398         }
 399
 400 exit:
 401         if (vid != NULL)
 402                 volume_id_close(vid);
 403
 404         logging_close();
 405         return rc;
 406 }