You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
292 lines
6.7 KiB
292 lines
6.7 KiB
/*
|
|
* plausible.c --- Figure out if a pathname is ext* or something else.
|
|
*
|
|
* Copyright 2014, Oracle, Inc.
|
|
*
|
|
* Some parts are:
|
|
* Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#ifndef _LARGEFILE_SOURCE
|
|
#define _LARGEFILE_SOURCE
|
|
#endif
|
|
#ifndef _LARGEFILE64_SOURCE
|
|
#define _LARGEFILE64_SOURCE
|
|
#endif
|
|
|
|
#include "config.h"
|
|
#include <fcntl.h>
|
|
#include <time.h>
|
|
#include <sys/types.h>
|
|
#ifdef HAVE_SYS_STAT_H
|
|
#include <sys/stat.h>
|
|
#endif
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#ifdef HAVE_MAGIC_H
|
|
#include <magic.h>
|
|
#endif
|
|
#include "plausible.h"
|
|
#include "ext2fs/ext2fs.h"
|
|
#include "nls-enable.h"
|
|
#include "blkid/blkid.h"
|
|
|
|
#ifdef HAVE_MAGIC_H
|
|
static magic_t (*dl_magic_open)(int);
|
|
static const char *(*dl_magic_file)(magic_t, const char *);
|
|
static int (*dl_magic_load)(magic_t, const char *);
|
|
static void (*dl_magic_close)(magic_t);
|
|
|
|
/*
|
|
* NO_CHECK functionality was only added in file 4.20.
|
|
* Older systems like RHEL 5.x still have file 4.17
|
|
*/
|
|
#ifndef MAGIC_NO_CHECK_COMPRESS
|
|
#define MAGIC_NO_CHECK_COMPRESS 0x0001000
|
|
#endif
|
|
#ifndef MAGIC_NO_CHECK_ELF
|
|
#define MAGIC_NO_CHECK_ELF 0x0010000
|
|
#endif
|
|
|
|
#ifdef HAVE_DLOPEN
|
|
#include <dlfcn.h>
|
|
|
|
static void *magic_handle;
|
|
|
|
static int magic_library_available(void)
|
|
{
|
|
if (!magic_handle) {
|
|
magic_handle = dlopen("libmagic.so.1", RTLD_NOW);
|
|
if (!magic_handle)
|
|
return 0;
|
|
|
|
dl_magic_open = (magic_t (*)(int))
|
|
dlsym(magic_handle, "magic_open");
|
|
dl_magic_file = (const char *(*)(magic_t, const char *))
|
|
dlsym(magic_handle, "magic_file");
|
|
dl_magic_load = (int (*)(magic_t, const char *))
|
|
dlsym(magic_handle, "magic_load");
|
|
dl_magic_close = (void (*)(magic_t))
|
|
dlsym(magic_handle, "magic_close");
|
|
}
|
|
|
|
if (!dl_magic_open || !dl_magic_file ||
|
|
!dl_magic_load || !dl_magic_close)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
#else
|
|
static int magic_library_available(void)
|
|
{
|
|
dl_magic_open = magic_open;
|
|
dl_magic_file = magic_file;
|
|
dl_magic_load = magic_load;
|
|
dl_magic_close = magic_close;
|
|
|
|
return 1;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
static void print_ext2_info(const char *device)
|
|
|
|
{
|
|
struct ext2_super_block *sb;
|
|
ext2_filsys fs;
|
|
errcode_t retval;
|
|
time_t tm;
|
|
char buf[80];
|
|
|
|
retval = ext2fs_open2(device, 0, EXT2_FLAG_64BITS, 0, 0,
|
|
unix_io_manager, &fs);
|
|
if (retval)
|
|
return;
|
|
sb = fs->super;
|
|
|
|
if (sb->s_mtime) {
|
|
tm = sb->s_mtime;
|
|
if (sb->s_last_mounted[0]) {
|
|
memset(buf, 0, sizeof(buf));
|
|
strncpy(buf, sb->s_last_mounted,
|
|
sizeof(sb->s_last_mounted));
|
|
printf(_("\tlast mounted on %s on %s"), buf,
|
|
ctime(&tm));
|
|
} else
|
|
printf(_("\tlast mounted on %s"), ctime(&tm));
|
|
} else if (sb->s_mkfs_time) {
|
|
tm = sb->s_mkfs_time;
|
|
printf(_("\tcreated on %s"), ctime(&tm));
|
|
} else if (sb->s_wtime) {
|
|
tm = sb->s_wtime;
|
|
printf(_("\tlast modified on %s"), ctime(&tm));
|
|
}
|
|
ext2fs_close_free(&fs);
|
|
}
|
|
|
|
/*
|
|
* return 1 if there is no partition table, 0 if a partition table is
|
|
* detected, and -1 on an error.
|
|
*/
|
|
#ifdef HAVE_BLKID_PROBE_ENABLE_PARTITIONS
|
|
static int check_partition_table(const char *device)
|
|
{
|
|
blkid_probe pr;
|
|
const char *value;
|
|
int ret;
|
|
|
|
pr = blkid_new_probe_from_filename(device);
|
|
if (!pr)
|
|
return -1;
|
|
|
|
ret = blkid_probe_enable_partitions(pr, 1);
|
|
if (ret < 0)
|
|
goto errout;
|
|
|
|
ret = blkid_probe_enable_superblocks(pr, 0);
|
|
if (ret < 0)
|
|
goto errout;
|
|
|
|
ret = blkid_do_fullprobe(pr);
|
|
if (ret < 0)
|
|
goto errout;
|
|
|
|
ret = blkid_probe_lookup_value(pr, "PTTYPE", &value, NULL);
|
|
if (ret == 0)
|
|
fprintf(stderr, _("Found a %s partition table in %s\n"),
|
|
value, device);
|
|
else
|
|
ret = 1;
|
|
|
|
errout:
|
|
blkid_free_probe(pr);
|
|
return ret;
|
|
}
|
|
#else
|
|
static int check_partition_table(const char *device EXT2FS_ATTR((unused)))
|
|
{
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* return 1 if the device looks plausible, creating the file if necessary
|
|
*/
|
|
int check_plausibility(const char *device, int flags, int *ret_is_dev)
|
|
{
|
|
int fd, ret, is_dev = 0;
|
|
ext2fs_struct_stat s;
|
|
int fl = O_RDONLY;
|
|
blkid_cache cache = NULL;
|
|
char *fs_type = NULL;
|
|
char *fs_label = NULL;
|
|
|
|
fd = ext2fs_open_file(device, fl, 0666);
|
|
if ((fd < 0) && (errno == ENOENT) && (flags & NO_SIZE)) {
|
|
fprintf(stderr, _("The file %s does not exist and no "
|
|
"size was specified.\n"), device);
|
|
exit(1);
|
|
}
|
|
if ((fd < 0) && (errno == ENOENT) && (flags & CREATE_FILE)) {
|
|
fl |= O_CREAT;
|
|
fd = ext2fs_open_file(device, fl, 0666);
|
|
if (fd >= 0 && (flags & VERBOSE_CREATE))
|
|
printf(_("Creating regular file %s\n"), device);
|
|
}
|
|
if (fd < 0) {
|
|
fprintf(stderr, _("Could not open %s: %s\n"),
|
|
device, error_message(errno));
|
|
if (errno == ENOENT)
|
|
fputs(_("\nThe device apparently does not exist; "
|
|
"did you specify it correctly?\n"), stderr);
|
|
exit(1);
|
|
}
|
|
|
|
if (ext2fs_fstat(fd, &s) < 0) {
|
|
perror("stat");
|
|
exit(1);
|
|
}
|
|
close(fd);
|
|
|
|
if (S_ISBLK(s.st_mode))
|
|
is_dev = 1;
|
|
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
|
/* On FreeBSD, all disk devices are character specials */
|
|
if (S_ISCHR(s.st_mode))
|
|
is_dev = 1;
|
|
#endif
|
|
if (ret_is_dev)
|
|
*ret_is_dev = is_dev;
|
|
|
|
if ((flags & CHECK_BLOCK_DEV) && !is_dev) {
|
|
printf(_("%s is not a block special device.\n"), device);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Note: we use the older-style blkid API's here because we
|
|
* want as much functionality to be available when using the
|
|
* internal blkid library, when e2fsprogs is compiled for
|
|
* non-Linux systems that will probably not have the libraries
|
|
* from util-linux available. We only use the newer
|
|
* blkid-probe interfaces to access functionality not
|
|
* available in the original blkid library.
|
|
*/
|
|
if ((flags & CHECK_FS_EXIST) && blkid_get_cache(&cache, NULL) >= 0) {
|
|
fs_type = blkid_get_tag_value(cache, "TYPE", device);
|
|
if (fs_type)
|
|
fs_label = blkid_get_tag_value(cache, "LABEL", device);
|
|
blkid_put_cache(cache);
|
|
}
|
|
|
|
if (fs_type) {
|
|
if (fs_label)
|
|
printf(_("%s contains a %s file system labelled '%s'\n"),
|
|
device, fs_type, fs_label);
|
|
else
|
|
printf(_("%s contains a %s file system\n"), device,
|
|
fs_type);
|
|
if (strncmp(fs_type, "ext", 3) == 0)
|
|
print_ext2_info(device);
|
|
free(fs_type);
|
|
free(fs_label);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_MAGIC_H
|
|
if ((flags & CHECK_FS_EXIST) &&
|
|
!getenv("E2FSPROGS_LIBMAGIC_SUPPRESS") &&
|
|
magic_library_available()) {
|
|
const char *msg;
|
|
magic_t mag;
|
|
int has_magic = 0;
|
|
|
|
mag = dl_magic_open(MAGIC_RAW | MAGIC_SYMLINK | MAGIC_DEVICES |
|
|
MAGIC_ERROR | MAGIC_NO_CHECK_ELF |
|
|
MAGIC_NO_CHECK_COMPRESS);
|
|
dl_magic_load(mag, NULL);
|
|
|
|
msg = dl_magic_file(mag, device);
|
|
if (msg && strcmp(msg, "data") && strcmp(msg, "empty")) {
|
|
printf(_("%s contains `%s' data\n"), device, msg);
|
|
has_magic = 1;
|
|
}
|
|
|
|
dl_magic_close(mag);
|
|
return !has_magic;
|
|
}
|
|
#endif
|
|
|
|
ret = check_partition_table(device);
|
|
if (ret >= 0)
|
|
return ret;
|
|
|
|
return 1;
|
|
}
|
|
|