diff --git a/usr.sbin/fstyp/fstyp.c b/usr.sbin/fstyp/fstyp.c
index 578210116ae5..dd06df33bbe2 100644
--- a/usr.sbin/fstyp/fstyp.c
+++ b/usr.sbin/fstyp/fstyp.c
@@ -1,266 +1,296 @@
/*-
* Copyright (c) 2014 The FreeBSD Foundation
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/capsicum.h>
#include <sys/disk.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <capsicum_helpers.h>
#include <err.h>
#include <errno.h>
#ifdef WITH_ICONV
#include <iconv.h>
#endif
#include <locale.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>
#include "fstyp.h"
#define LABEL_LEN 256
bool show_label = false;
typedef int (*fstyp_function)(FILE *, char *, size_t);
+/*
+ * The ordering of fstypes[] is not arbitrary.
+ *
+ * fstyp checks the existence of a file system header to determine the
+ * type of file system on a given device. For different file systems,
+ * these headers reside at different offsets within the device.
+ *
+ * For example, the header for an MS-DOS file system begins at offset 0,
+ * whereas a header for UFS *normally* begins at offset 64k. If a device
+ * was constructed as MS-DOS and then repurposed as UFS (via newfs), it
+ * is possible the MS-DOS header will still be intact. To prevent
+ * misidentifying the file system, it is desirable to check the header
+ * with the largest offset first (i.e., UFS before MS-DOS).
+ */
static struct {
const char *name;
fstyp_function function;
bool unmountable;
const char *precache_encoding;
} fstypes[] = {
- { "apfs", &fstyp_apfs, true, NULL },
- { "befs", &fstyp_befs, false, NULL },
+ /* last sector of geli device */
+ { "geli", &fstyp_geli, true, NULL },
+ /*
+ * ufs headers have four different areas, searched in this order:
+ * offsets: 64k, 8k, 0k, 256k + 8192 bytes
+ */
+ { "ufs", &fstyp_ufs, false, NULL },
+ /* offset 32768 + 512 bytes */
{ "cd9660", &fstyp_cd9660, false, NULL },
- { "exfat", &fstyp_exfat, false, EXFAT_ENC },
+ /* offset 1024 + 512 bytes */
+ { "hfs+", &fstyp_hfsp, false, NULL },
+ /* offset 1024 + 512 bytes */
{ "ext2fs", &fstyp_ext2fs, false, NULL },
- { "geli", &fstyp_geli, true, NULL },
+ /* offset 512 + 36 bytes */
+ { "befs", &fstyp_befs, false, NULL },
+ /* offset 0 + 40 bytes */
+ { "apfs", &fstyp_apfs, true, NULL },
+ /* offset 0 + 512 bytes (for initial signature check) */
+ { "exfat", &fstyp_exfat, false, EXFAT_ENC },
+ /* offset 0 + 1928 bytes */
{ "hammer", &fstyp_hammer, true, NULL },
+ /* offset 0 + 65536 bytes (for initial signature check) */
{ "hammer2", &fstyp_hammer2, true, NULL },
- { "hfs+", &fstyp_hfsp, false, NULL },
+ /* offset 0 + 512 bytes (for initial signature check) */
{ "msdosfs", &fstyp_msdosfs, false, NULL },
+ /* offset 0 + 512 bytes (for initial signature check) */
{ "ntfs", &fstyp_ntfs, false, NTFS_ENC },
- { "ufs", &fstyp_ufs, false, NULL },
#ifdef HAVE_ZFS
+ /* offset 0 + 256k */
{ "zfs", &fstyp_zfs, true, NULL },
#endif
{ NULL, NULL, NULL, NULL }
};
void *
read_buf(FILE *fp, off_t off, size_t len)
{
int error;
size_t nread;
void *buf;
error = fseek(fp, off, SEEK_SET);
if (error != 0) {
warn("cannot seek to %jd", (uintmax_t)off);
return (NULL);
}
buf = malloc(len);
if (buf == NULL) {
warn("cannot malloc %zd bytes of memory", len);
return (NULL);
}
nread = fread(buf, len, 1, fp);
if (nread != 1) {
free(buf);
if (feof(fp) == 0)
warn("fread");
return (NULL);
}
return (buf);
}
char *
checked_strdup(const char *s)
{
char *c;
c = strdup(s);
if (c == NULL)
err(1, "strdup");
return (c);
}
void
rtrim(char *label, size_t size)
{
ptrdiff_t i;
for (i = size - 1; i >= 0; i--) {
if (label[i] == '\0')
continue;
else if (label[i] == ' ')
label[i] = '\0';
else
break;
}
}
static void
usage(void)
{
fprintf(stderr, "usage: fstyp [-l] [-s] [-u] special\n");
exit(1);
}
static void
type_check(const char *path, FILE *fp)
{
int error, fd;
off_t mediasize;
struct stat sb;
fd = fileno(fp);
error = fstat(fd, &sb);
if (error != 0)
err(1, "%s: fstat", path);
if (S_ISREG(sb.st_mode))
return;
error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
if (error != 0)
errx(1, "%s: not a disk", path);
}
int
main(int argc, char **argv)
{
int ch, error, i, nbytes;
bool ignore_type = false, show_unmountable = false;
char label[LABEL_LEN + 1], strvised[LABEL_LEN * 4 + 1];
char *path;
FILE *fp;
fstyp_function fstyp_f;
while ((ch = getopt(argc, argv, "lsu")) != -1) {
switch (ch) {
case 'l':
show_label = true;
break;
case 's':
ignore_type = true;
break;
case 'u':
show_unmountable = true;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
path = argv[0];
if (setlocale(LC_CTYPE, "") == NULL)
err(1, "setlocale");
caph_cache_catpages();
#ifdef WITH_ICONV
/* Cache iconv conversion data before entering capability mode. */
if (show_label) {
for (i = 0; i < (int)nitems(fstypes); i++) {
iconv_t cd;
if (fstypes[i].precache_encoding == NULL)
continue;
cd = iconv_open("", fstypes[i].precache_encoding);
if (cd == (iconv_t)-1)
err(1, "%s: iconv_open %s", fstypes[i].name,
fstypes[i].precache_encoding);
/* Iconv keeps a small cache of unused encodings. */
iconv_close(cd);
}
}
#endif
fp = fopen(path, "r");
if (fp == NULL)
err(1, "%s", path);
if (caph_enter() < 0)
err(1, "cap_enter");
if (ignore_type == false)
type_check(path, fp);
memset(label, '\0', sizeof(label));
for (i = 0;; i++) {
if (show_unmountable == false && fstypes[i].unmountable == true)
continue;
fstyp_f = fstypes[i].function;
if (fstyp_f == NULL)
break;
error = fstyp_f(fp, label, sizeof(label));
if (error == 0)
break;
}
if (fstypes[i].name == NULL) {
warnx("%s: filesystem not recognized", path);
return (1);
}
if (show_label && label[0] != '\0') {
/*
* XXX: I'd prefer VIS_HTTPSTYLE, but it unconditionally
* encodes spaces.
*/
nbytes = strsnvis(strvised, sizeof(strvised), label,
VIS_GLOB | VIS_NL, "\"'$");
if (nbytes == -1)
err(1, "strsnvis");
printf("%s %s\n", fstypes[i].name, strvised);
} else {
printf("%s\n", fstypes[i].name);
}
return (0);
}