vol_id.c revision 915fde17387f7245164fbda21a0f5bbc185f7dc2
/*
* vol_id - read filesystem label and uuid
*
* Copyright (C) 2005-2006 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#include <sys/ioctl.h>
#include "../../udev.h"
#include "lib/libvolume_id.h"
#define BLKGETSIZE64 _IOR(0x12,114,size_t)
#ifdef USE_LOG
void log_message(int priority, const char *format, ...)
{
va_list args;
static int udev_log = -1;
if (udev_log == -1) {
const char *value;
value = getenv("UDEV_LOG");
if (value)
udev_log = log_priority(value);
else
udev_log = LOG_ERR;
}
if (priority > udev_log)
return;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
}
#endif
static void vid_log(int priority, const char *file, int line, const char *format, ...)
{
#ifdef USE_LOG
char log_str[1024];
va_list args;
va_start(args, format);
vsnprintf(log_str, sizeof(log_str), format, args);
log_str[sizeof(log_str)-1] = '\0';
log_message(priority, "%s:%i %s", file, line, log_str);
va_end(args);
#endif
return;
}
static void set_str(char *to, const char *from, size_t count)
{
size_t i, j, len;
/* strip trailing whitespace */
len = strnlen(from, count);
while (len && isspace(from[len-1]))
len--;
/* strip leading whitespace */
i = 0;
while (isspace(from[i]) && (i < len))
i++;
j = 0;
while (i < len) {
/* substitute multiple whitespace */
if (isspace(from[i])) {
while (isspace(from[i]))
i++;
to[j++] = '_';
}
/* skip chars */
if (from[i] == '/') {
i++;
continue;
}
to[j++] = from[i++];
}
to[j] = '\0';
}
int main(int argc, char *argv[])
{
const char help[] = "Usage: vol_id [options] <device>\n"
" --export export key/value pairs\n"
" -t filesystem type\n"
" -l filesystem label\n"
" -u filesystem uuid\n"
" -L raw label\n"
" --skip-raid don't probe for raid\n"
" --probe-all find possibly conflicting signatures\n"
" --help\n"
"\n";
enum print_type {
PRINT_EXPORT,
PRINT_TYPE,
PRINT_LABEL,
PRINT_UUID,
PRINT_RAW_LABEL,
} print = PRINT_EXPORT;
struct volume_id *vid = NULL;
static char name[VOLUME_ID_LABEL_SIZE];
int i;
uint64_t size;
int skip_raid = 0;
int probe_all = 0;
const char *node = NULL;
struct passwd *pw;
int retval;
int rc = 0;
logging_init("vol_id");
/* hook in our debug into libvolume_id */
volume_id_log_fn = vid_log;
for (i = 1 ; i < argc; i++) {
char *arg = argv[i];
if (strcmp(arg, "--export") == 0) {
print = PRINT_EXPORT;
} else if (strcmp(arg, "-t") == 0) {
print = PRINT_TYPE;
} else if (strcmp(arg, "-l") == 0) {
print = PRINT_LABEL;
} else if (strcmp(arg, "-u") == 0) {
print = PRINT_UUID;
} else if (strcmp(arg, "-L") == 0) {
print = PRINT_RAW_LABEL;
} else if (strcmp(arg, "--skip-raid") == 0) {
skip_raid = 1;
} else if (strcmp(arg, "--probe-all") == 0) {
probe_all = 1;
} else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0) {
printf(help);
goto exit;
} else
node = arg;
}
if (!node) {
err("no node specified");
fprintf(stderr, help);
rc = 1;
goto exit;
}
vid = volume_id_open_node(node);
if (vid == NULL) {
fprintf(stderr, "%s: error open volume\n", node);
rc = 2;
goto exit;
}
if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
size = 0;
dbg("BLKGETSIZE64=%llu", size);
/* try to drop all privileges before reading disk content */
pw = getpwnam ("nobody");
if (pw != NULL && pw->pw_uid > 0 && pw->pw_gid > 0) {
dbg("dropping privileges to %u:%u",
(unsigned int)pw->pw_uid, (unsigned int)pw->pw_gid);
if (setgroups(0, NULL) != 0 ||
setgid(pw->pw_gid) != 0 ||
setuid(pw->pw_uid) != 0) {
fprintf(stderr, "error dropping privileges: %s\n", strerror(errno));
rc = 3;
goto exit;
}
}
if (probe_all) {
if (volume_id_probe_linux_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_intel_software_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_lsi_mega_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_via_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_silicon_medley_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_nvidia_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_promise_fasttrack_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_highpoint_45x_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_adaptec_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_jmicron_raid(vid, 0, size) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_vfat(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_linux_swap(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_luks(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_xfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_ext(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_reiserfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_jfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_udf(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_iso9660(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_hfs_hfsplus(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_ufs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_ntfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_cramfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_romfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_hpfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_sysv(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_minix(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_ocfs1(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_ocfs2(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_vxfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_squashfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_netware(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_gfs(vid, 0, 0) == 0)
printf("%s\n", vid->type);
if (volume_id_probe_gfs2(vid, 0, 0) == 0)
printf("%s\n", vid->type);
goto exit;
}
if (skip_raid)
retval = volume_id_probe_filesystem(vid, 0, size);
else
retval = volume_id_probe_all(vid, 0, size);
if (retval != 0) {
fprintf(stderr, "%s: unknown volume type\n", node);
rc = 4;
goto exit;
}
set_str(name, vid->label, sizeof(vid->label));
replace_untrusted_chars(name);
switch (print) {
case PRINT_EXPORT:
printf("ID_FS_USAGE=%s\n", vid->usage);
printf("ID_FS_TYPE=%s\n", vid->type);
printf("ID_FS_VERSION=%s\n", vid->type_version);
printf("ID_FS_UUID=%s\n", vid->uuid);
printf("ID_FS_LABEL=%s\n", vid->label);
printf("ID_FS_LABEL_SAFE=%s\n", name);
break;
case PRINT_TYPE:
printf("%s\n", vid->type);
break;
case PRINT_LABEL:
if (name[0] == '\0' || vid->usage_id == VOLUME_ID_RAID) {
rc = 3;
goto exit;
}
printf("%s\n", name);
break;
case PRINT_UUID:
if (vid->uuid[0] == '\0' || vid->usage_id == VOLUME_ID_RAID) {
rc = 4;
goto exit;
}
printf("%s\n", vid->uuid);
break;
case PRINT_RAW_LABEL:
if (vid->label[0] == '\0' || vid->usage_id == VOLUME_ID_RAID) {
rc = 3;
goto exit;
}
printf("%s\n", vid->label);
break;
}
exit:
if (vid != NULL)
volume_id_close(vid);
logging_close();
return rc;
}