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