Super User's BSD Cross Reference: /FreeBSD/usr.sbin/fstyp/fstyp.c

 /*-
 * 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/cdefs.h>
 __FBSDID("$FreeBSD$");

#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);

 static struct {
 const char *name;
 fstyp_function function;
 bool unmountable;
 char *precache_encoding;
} fstypes[] = {
 { "apfs", &fstyp_apfs, true, NULL },
 { "cd9660", &fstyp_cd9660, false, NULL },
 { "exfat", &fstyp_exfat, false, EXFAT_ENC },
 { "ext2fs", &fstyp_ext2fs, false, NULL },
 { "geli", &fstyp_geli, true, NULL },
 { "hammer", &fstyp_hammer, true, NULL },
 { "hammer2", &fstyp_hammer2, true, NULL },
 { "hfs+", &fstyp_hfsp, false, NULL },
 { "msdosfs", &fstyp_msdosfs, false, NULL },
 { "ntfs", &fstyp_ntfs, false, NTFS_ENC },
 { "ufs", &fstyp_ufs, false, NULL },
#ifdef HAVE_ZFS
 { "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円')
 continue;
 else if (label[i] == ' ')
 label[i] = '0円';
 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 < 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円', 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円') {
 /*
 * 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);
}
 

Indexes created Tue Nov 11 03:55:12 PST 2025