usr.sbin/fstyp/fstyp.c

   1 /*-
   2  * Copyright (c) 2016 The DragonFly Project
   3  * Copyright (c) 2014 The FreeBSD Foundation
   4  * All rights reserved.
   5  *
   6  * This software was developed by Edward Tomasz Napierala under sponsorship
   7  * from the FreeBSD Foundation.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  */
  31
  32 #include <sys/diskslice.h>
  33 #include <sys/ioctl.h>
  34 #include <sys/stat.h>
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <stdbool.h>
  38 #include <stddef.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <vis.h>
  44
  45 #include "fstyp.h"
  46
  47 #define LABEL_LEN       256
  48
  49 typedef int (*fstyp_function)(FILE *, char *, size_t);
  50 typedef int (*fsvtyp_function)(const char *, char *, size_t);
  51
  52 static struct {
  53         const char      *name;
  54         fstyp_function  function;
  55         bool            unmountable;
  56 } fstypes[] = {
  57         { "cd9660", &fstyp_cd9660, false },
  58         { "ext2fs", &fstyp_ext2fs, false },
  59         { "msdosfs", &fstyp_msdosfs, false },
  60         { "ntfs", &fstyp_ntfs, false },
  61         { "ufs", &fstyp_ufs, false },
  62         { "hammer", &fstyp_hammer, false },
  63         { NULL, NULL, NULL }
  64 };
  65
  66 static struct {
  67         const char      *name;
  68         fsvtyp_function function;
  69         bool            unmountable;
  70 } fsvtypes[] = {
  71         { "hammer", &fsvtyp_hammer, false }, /* Must be before partial */
  72         { "hammer(partial)", &fsvtyp_hammer_partial, true },
  73         { NULL, NULL, NULL }
  74 };
  75
  76 void *
  77 read_buf(FILE *fp, off_t off, size_t len)
  78 {
  79         int error;
  80         size_t nread;
  81         void *buf;
  82
  83         error = fseek(fp, off, SEEK_SET);
  84         if (error != 0) {
  85                 warn("cannot seek to %jd", (uintmax_t)off);
  86                 return (NULL);
  87         }
  88
  89         buf = malloc(len);
  90         if (buf == NULL) {
  91                 warn("cannot malloc %zd bytes of memory", len);
  92                 return (NULL);
  93         }
  94
  95         nread = fread(buf, len, 1, fp);
  96         if (nread != 1) {
  97                 free(buf);
  98                 if (feof(fp) == 0)
  99                         warn("fread");
 100                 return (NULL);
 101         }
 102
 103         return (buf);
 104 }
 105
 106 char *
 107 checked_strdup(const char *s)
 108 {
 109         char *c;
 110
 111         c = strdup(s);
 112         if (c == NULL)
 113                 err(1, "strdup");
 114         return (c);
 115 }
 116
 117 void
 118 rtrim(char *label, size_t size)
 119 {
 120         ptrdiff_t i;
 121
 122         for (i = size - 1; i >= 0; i--) {
 123                 if (label[i] == '\0')
 124                         continue;
 125                 else if (label[i] == ' ')
 126                         label[i] = '\0';
 127                 else
 128                         break;
 129         }
 130 }
 131
 132 static void
 133 usage(void)
 134 {
 135
 136         fprintf(stderr, "usage: fstyp [-l] [-s] [-u] special\n");
 137         exit(1);
 138 }
 139
 140 static void
 141 type_check(const char *path, FILE *fp)
 142 {
 143         int error, fd;
 144         struct stat sb;
 145         struct partinfo pinfo;
 146
 147         fd = fileno(fp);
 148
 149         error = fstat(fd, &sb);
 150         if (error != 0)
 151                 err(1, "%s: fstat", path);
 152
 153         if (S_ISREG(sb.st_mode))
 154                 return;
 155
 156         error = ioctl(fd, DIOCGPART, &pinfo);
 157         if (error != 0)
 158                 errx(1, "%s: not a disk", path);
 159 }
 160
 161 int
 162 main(int argc, char **argv)
 163 {
 164         int ch, error, i, nbytes;
 165         bool ignore_type = false, show_label = false, show_unmountable = false;
 166         char label[LABEL_LEN + 1], strvised[LABEL_LEN * 4 + 1];
 167         char *path;
 168         const char *name = NULL;
 169         FILE *fp;
 170         fstyp_function fstyp_f;
 171         fsvtyp_function fsvtyp_f;
 172
 173         while ((ch = getopt(argc, argv, "lsu")) != -1) {
 174                 switch (ch) {
 175                 case 'l':
 176                         show_label = true;
 177                         break;
 178                 case 's':
 179                         ignore_type = true;
 180                         break;
 181                 case 'u':
 182                         show_unmountable = true;
 183                         break;
 184                 default:
 185                         usage();
 186                 }
 187         }
 188
 189         argc -= optind;
 190         argv += optind;
 191         if (argc != 1)
 192                 usage();
 193
 194         path = argv[0];
 195
 196         fp = fopen(path, "r");
 197         if (fp == NULL)
 198                 goto fsvtyp; /* DragonFly */
 199
 200         if (ignore_type == false)
 201                 type_check(path, fp);
 202
 203         memset(label, '\0', sizeof(label));
 204
 205         for (i = 0;; i++) {
 206                 if (show_unmountable == false && fstypes[i].unmountable == true)
 207                         continue;
 208                 fstyp_f = fstypes[i].function;
 209                 if (fstyp_f == NULL)
 210                         break;
 211
 212                 error = fstyp_f(fp, label, sizeof(label));
 213                 if (error == 0) {
 214                         name = fstypes[i].name;
 215                         goto done;
 216                 }
 217         }
 218 fsvtyp:
 219         for (i = 0;; i++) {
 220                 if (show_unmountable == false && fsvtypes[i].unmountable == true)
 221                         continue;
 222                 fsvtyp_f = fsvtypes[i].function;
 223                 if (fsvtyp_f == NULL)
 224                         break;
 225
 226                 error = fsvtyp_f(path, label, sizeof(label));
 227                 if (error == 0) {
 228                         name = fsvtypes[i].name;
 229                         goto done;
 230                 }
 231         }
 232
 233         warnx("%s: filesystem not recognized", path);
 234         return (1);
 235 done:
 236         if (show_label && label[0] != '\0') {
 237                 /*
 238                  * XXX: I'd prefer VIS_HTTPSTYLE, but it unconditionally
 239                  *      encodes spaces.
 240                  * XXX: DragonFly doesn't have strsnvis().
 241                  */
 242                 nbytes = strnvis(strvised, label, sizeof(strvised),
 243                     VIS_GLOB | VIS_NL);
 244                 if (nbytes == -1)
 245                         err(1, "strnvis");
 246
 247                 printf("%s %s\n", name, strvised);
 248         } else {
 249                 printf("%s\n", name);
 250         }
 251
 252         return (0);
 253 }