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/*
* vol_id - udev callout to read filesystem label and uuid
*
* Copyright (C) 2005 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 <grp.h>
#include <sys/ioctl.h>
#include "../../udev.h"
#include "libvolume_id/volume_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 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 [--export|-t|-l|-u] <device>\n"
" --export\n"
" -t filesystem type\n"
" -l filesystem label\n"
" -u filesystem uuid\n"
"\n";
enum print_type {
PRINT_EXPORT,
PRINT_TYPE,
PRINT_LABEL,
PRINT_UUID,
} print = PRINT_EXPORT;
struct volume_id *vid = NULL;
static char name[VOLUME_ID_LABEL_SIZE];
int i;
uint64_t size;
const char *node = NULL;
uid_t nobody_uid;
gid_t nobody_gid;
int rc = 0;
logging_init("vol_id");
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
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);
/* drop all privileges */
nobody_uid = lookup_user("nobody");
nobody_gid = lookup_group("nogroup");
if (nobody_uid > 0 && nobody_gid > 0) {
if (setgroups(0, NULL) != 0 ||
setgid(nobody_gid) != 0 ||
setuid(nobody_uid) != 0) {
rc = 3;
goto exit;
}
}
if (volume_id_probe_all(vid, 0, size) == 0)
goto print;
if (print != PRINT_EXPORT)
fprintf(stderr, "%s: unknown volume type\n", node);
rc = 4;
goto exit;
print:
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_FILESYSTEM && vid->usage_id != VOLUME_ID_DISKLABEL)) {
rc = 3;
goto exit;
}
printf("%s\n", name);
break;
case PRINT_UUID:
if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) {
rc = 4;
goto exit;
}
printf("%s\n", vid->uuid);
break;
}
exit:
if (vid != NULL)
volume_id_close(vid);
logging_close();
return rc;
}
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