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 label_safe[128];
 138         char uuid_safe[128];
 139         uint64_t size;
 140         int skip_raid = 0;
 141         int probe_all = 0;
 142         const char *node;
 143         struct passwd *pw;
 144         int fd;
 145         const char *label, *uuid, *type, *type_version, *usage;
 146         int retval;
 147         int rc = 0;
 148
 149         logging_init("vol_id");
 150
 151         /* hook in our debug into libvolume_id */
 152         volume_id_log_fn = vid_log;
 153
 154         while (1) {
 155                 int option;
 156
 157                 option = getopt_long(argc, argv, "lLutxsah", options, NULL);
 158                 if (option == -1)
 159                         break;
 160
 161                 switch (option) {
 162                 case 'l':
 163                         print = PRINT_LABEL;
 164                         break;
 165                 case 'L':
 166                         print = PRINT_LABEL_RAW;
 167                         break;
 168                 case 'u':
 169                         print = PRINT_UUID;
 170                         break;
 171                 case 't':
 172                         print = PRINT_TYPE;
 173                         break;
 174                 case 'x':
 175                         print = PRINT_EXPORT;
 176                         break;
 177                 case 's':
 178                         skip_raid = 1;
 179                         break;
 180                 case 'a':
 181                         probe_all = 1;
 182                         break;
 183                 case 'h':
 184                         printf("Usage: vol_id [options] <device>\n"
 185                             " --export        export key/value pairs\n"
 186                             " --type          filesystem type\n"
 187                             " --label         filesystem label\n"
 188                             " --label-raw     raw label\n"
 189                             " --uuid          filesystem uuid\n"
 190                             " --skip-raid     don't probe for raid\n"
 191                             " --probe-all     find possibly conflicting signatures\n"
 192                             " --help\n\n");
 193                         goto exit;
 194                 default:
 195                         retval = 1;
 196                         goto exit;
 197                 }
 198         }
 199
 200         node = argv[optind];
 201         if (!node) {
 202                 err("no device");
 203                 fprintf(stderr, "no device\n");
 204                 rc = 1;
 205                 goto exit;
 206         }
 207
 208         fd = open(node, O_RDONLY);
 209         if (fd < 0) {
 210                 fprintf(stderr, "%s: error opening volume\n", node);
 211                 rc = 2;
 212                 goto exit;
 213         }
 214
 215         vid = volume_id_open_fd(fd);
 216         if (vid == NULL) {
 217                 rc = 2;
 218                 goto exit;
 219         }
 220
 221         if (ioctl(fd, BLKGETSIZE64, &size) != 0)
 222                 size = 0;
 223         dbg("BLKGETSIZE64=%llu", (unsigned long long)size);
 224
 225         /* try to drop all privileges before reading disk content */
 226         pw = getpwnam ("nobody");
 227         if (pw != NULL && pw->pw_uid > 0 && pw->pw_gid > 0) {
 228                 dbg("dropping privileges to %u:%u",
 229                     (unsigned int)pw->pw_uid, (unsigned int)pw->pw_gid);
 230                 if (setgroups(0, NULL) != 0 ||
 231                     setgid(pw->pw_gid) != 0 ||
 232                     setuid(pw->pw_uid) != 0) {
 233                         fprintf(stderr, "error dropping privileges: %s\n", strerror(errno));
 234                         rc = 3;
 235                         goto exit;
 236                 }
 237         }
 238
 239         if (probe_all) {
 240                 if (volume_id_probe_linux_raid(vid, 0, size) == 0)
 241                         if (volume_id_get_type(vid, &type))
 242                                 printf("%s\n", type);
 243                 if (volume_id_probe_ddf_raid(vid, 0, 0) == 0)
 244                         if (volume_id_get_type(vid, &type))
 245                                 printf("%s\n", type);
 246                 if (volume_id_probe_intel_software_raid(vid, 0, size) == 0)
 247                         if (volume_id_get_type(vid, &type))
 248                                 printf("%s\n", type);
 249                 if (volume_id_probe_lsi_mega_raid(vid, 0, size) == 0)
 250                         if (volume_id_get_type(vid, &type))
 251                                 printf("%s\n", type);
 252                 if (volume_id_probe_via_raid(vid, 0, size) == 0)
 253                         if (volume_id_get_type(vid, &type))
 254                                 printf("%s\n", type);
 255                 if (volume_id_probe_silicon_medley_raid(vid, 0, size) == 0)
 256                         if (volume_id_get_type(vid, &type))
 257                                 printf("%s\n", type);
 258                 if (volume_id_probe_nvidia_raid(vid, 0, size) == 0)
 259                         if (volume_id_get_type(vid, &type))
 260                                 printf("%s\n", type);
 261                 if (volume_id_probe_promise_fasttrack_raid(vid, 0, size) == 0)
 262                         if (volume_id_get_type(vid, &type))
 263                                 printf("%s\n", type);
 264                 if (volume_id_probe_highpoint_45x_raid(vid, 0, size) == 0)
 265                         if (volume_id_get_type(vid, &type))
 266                                 printf("%s\n", type);
 267                 if (volume_id_probe_adaptec_raid(vid, 0, size) == 0)
 268                         if (volume_id_get_type(vid, &type))
 269                                 printf("%s\n", type);
 270                 if (volume_id_probe_jmicron_raid(vid, 0, size) == 0)
 271                         if (volume_id_get_type(vid, &type))
 272                                 printf("%s\n", type);
 273                 if (volume_id_probe_vfat(vid, 0, 0) == 0)
 274                         if (volume_id_get_type(vid, &type))
 275                                 printf("%s\n", type);
 276                 if (volume_id_probe_linux_swap(vid, 0, 0) == 0)
 277                         if (volume_id_get_type(vid, &type))
 278                                 printf("%s\n", type);
 279                 if (volume_id_probe_luks(vid, 0, 0) == 0)
 280                         if (volume_id_get_type(vid, &type))
 281                                 printf("%s\n", type);
 282                 if (volume_id_probe_xfs(vid, 0, 0) == 0)
 283                         if (volume_id_get_type(vid, &type))
 284                                 printf("%s\n", type);
 285                 if (volume_id_probe_ext(vid, 0, 0) == 0)
 286                         if (volume_id_get_type(vid, &type))
 287                                 printf("%s\n", type);
 288                 if (volume_id_probe_reiserfs(vid, 0, 0) == 0)
 289                         if (volume_id_get_type(vid, &type))
 290                                 printf("%s\n", type);
 291                 if (volume_id_probe_jfs(vid, 0, 0) == 0)
 292                         if (volume_id_get_type(vid, &type))
 293                                 printf("%s\n", type);
 294                 if (volume_id_probe_udf(vid, 0, 0) == 0)
 295                         if (volume_id_get_type(vid, &type))
 296                                 printf("%s\n", type);
 297                 if (volume_id_probe_iso9660(vid, 0, 0) == 0)
 298                         if (volume_id_get_type(vid, &type))
 299                                 printf("%s\n", type);
 300                 if (volume_id_probe_hfs_hfsplus(vid, 0, 0) == 0)
 301                         if (volume_id_get_type(vid, &type))
 302                                 printf("%s\n", type);
 303                 if (volume_id_probe_ufs(vid, 0, 0) == 0)
 304                         if (volume_id_get_type(vid, &type))
 305                                 printf("%s\n", type);
 306                 if (volume_id_probe_ntfs(vid, 0, 0)  == 0)
 307                         if (volume_id_get_type(vid, &type))
 308                                 printf("%s\n", type);
 309                 if (volume_id_probe_cramfs(vid, 0, 0) == 0)
 310                         if (volume_id_get_type(vid, &type))
 311                                 printf("%s\n", type);
 312                 if (volume_id_probe_romfs(vid, 0, 0) == 0)
 313                         if (volume_id_get_type(vid, &type))
 314                                 printf("%s\n", type);
 315                 if (volume_id_probe_hpfs(vid, 0, 0) == 0)
 316                         if (volume_id_get_type(vid, &type))
 317                                 printf("%s\n", type);
 318                 if (volume_id_probe_sysv(vid, 0, 0) == 0)
 319                         if (volume_id_get_type(vid, &type))
 320                                 printf("%s\n", type);
 321                 if (volume_id_probe_minix(vid, 0, 0) == 0)
 322                         if (volume_id_get_type(vid, &type))
 323                                 printf("%s\n", type);
 324                 if (volume_id_probe_ocfs1(vid, 0, 0) == 0)
 325                         if (volume_id_get_type(vid, &type))
 326                                 printf("%s\n", type);
 327                 if (volume_id_probe_ocfs2(vid, 0, 0) == 0)
 328                         if (volume_id_get_type(vid, &type))
 329                                 printf("%s\n", type);
 330                 if (volume_id_probe_vxfs(vid, 0, 0) == 0)
 331                         if (volume_id_get_type(vid, &type))
 332                                 printf("%s\n", type);
 333                 if (volume_id_probe_squashfs(vid, 0, 0) == 0)
 334                         if (volume_id_get_type(vid, &type))
 335                                 printf("%s\n", type);
 336                 if (volume_id_probe_netware(vid, 0, 0) == 0)
 337                         if (volume_id_get_type(vid, &type))
 338                                 printf("%s\n", type);
 339                 if (volume_id_probe_gfs(vid, 0, 0) == 0)
 340                         if (volume_id_get_type(vid, &type))
 341                                 printf("%s\n", type);
 342                 if (volume_id_probe_gfs2(vid, 0, 0) == 0)
 343                         if (volume_id_get_type(vid, &type))
 344                                 printf("%s\n", type);
 345                 goto exit;
 346         }
 347
 348         if (skip_raid)
 349                 retval = volume_id_probe_filesystem(vid, 0, size);
 350         else
 351                 retval = volume_id_probe_all(vid, 0, size);
 352         if (retval != 0) {
 353                 fprintf(stderr, "%s: unknown volume type\n", node);
 354                 rc = 4;
 355                 goto exit;
 356         }
 357
 358         if (!volume_id_get_label(vid, &label) ||
 359             !volume_id_get_usage(vid, &usage) ||
 360             !volume_id_get_type(vid, &type) ||
 361             !volume_id_get_type_version(vid, &type_version) ||
 362             !volume_id_get_uuid(vid, &uuid)) {
 363                 rc = 4;
 364                 goto exit;
 365         }
 366
 367         set_str(label_safe, label, sizeof(label_safe));
 368         replace_untrusted_chars(label_safe);
 369         set_str(uuid_safe, uuid, sizeof(uuid_safe));
 370         replace_untrusted_chars(uuid_safe);
 371
 372         switch (print) {
 373         case PRINT_EXPORT:
 374                 printf("ID_FS_USAGE=%s\n", usage);
 375                 printf("ID_FS_TYPE=%s\n", type);
 376                 printf("ID_FS_VERSION=%s\n", type_version);
 377                 printf("ID_FS_UUID=%s\n", uuid);
 378                 printf("ID_FS_UUID_SAFE=%s\n", uuid_safe);
 379                 printf("ID_FS_LABEL=%s\n", label);
 380                 printf("ID_FS_LABEL_SAFE=%s\n", label_safe);
 381                 break;
 382         case PRINT_TYPE:
 383                 printf("%s\n", type);
 384                 break;
 385         case PRINT_LABEL:
 386                 if (label_safe[0] == '\0' || strcmp(usage, "raid") == 0) {
 387                         rc = 3;
 388                         goto exit;
 389                 }
 390                 printf("%s\n", label_safe);
 391                 break;
 392         case PRINT_UUID:
 393                 if (uuid_safe[0] == '\0' || strcmp(usage, "raid") == 0) {
 394                         rc = 4;
 395                         goto exit;
 396                 }
 397                 printf("%s\n", uuid_safe);
 398                 break;
 399         case PRINT_LABEL_RAW:
 400                 if (label[0] == '\0' || strcmp(usage, "raid") == 0) {
 401                         rc = 3;
 402                         goto exit;
 403                 }
 404                 printf("%s\n", label);
 405                 break;
 406         }
 407
 408 exit:
 409         if (vid != NULL)
 410                 volume_id_close(vid);
 411
 412         logging_close();
 413         return rc;
 414 }