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