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