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         { "hammer2", &fstyp_hammer2, false },
  64         { NULL, NULL, NULL }
  65 };
  66
  67 static struct {
  68         const char      *name;
  69         fsvtyp_function function;
  70         bool            unmountable;
  71 } fsvtypes[] = {
  72         { "hammer", &fsvtyp_hammer, false }, /* Must be before partial */
  73         { "hammer(partial)", &fsvtyp_hammer_partial, true },
  74         // XXX hammer2 not supported yet
  75         { NULL, NULL, NULL }
  76 };
  77
  78 void *
  79 read_buf(FILE *fp, off_t off, size_t len)
  80 {
  81         int error;
  82         size_t nread;
  83         void *buf;
  84
  85         error = fseek(fp, off, SEEK_SET);
  86         if (error != 0) {
  87                 warn("cannot seek to %jd", (uintmax_t)off);
  88                 return (NULL);
  89         }
  90
  91         buf = malloc(len);
  92         if (buf == NULL) {
  93                 warn("cannot malloc %zd bytes of memory", len);
  94                 return (NULL);
  95         }
  96
  97         nread = fread(buf, len, 1, fp);
  98         if (nread != 1) {
  99                 free(buf);
 100                 if (feof(fp) == 0)
 101                         warn("fread");
 102                 return (NULL);
 103         }
 104
 105         return (buf);
 106 }
 107
 108 char *
 109 checked_strdup(const char *s)
 110 {
 111         char *c;
 112
 113         c = strdup(s);
 114         if (c == NULL)
 115                 err(1, "strdup");
 116         return (c);
 117 }
 118
 119 void
 120 rtrim(char *label, size_t size)
 121 {
 122         ptrdiff_t i;
 123
 124         for (i = size - 1; i >= 0; i--) {
 125                 if (label[i] == '\0')
 126                         continue;
 127                 else if (label[i] == ' ')
 128                         label[i] = '\0';
 129                 else
 130                         break;
 131         }
 132 }
 133
 134 static void
 135 usage(void)
 136 {
 137
 138         fprintf(stderr, "usage: fstyp [-l] [-s] [-u] special\n");
 139         exit(1);
 140 }
 141
 142 static void
 143 type_check(const char *path, FILE *fp)
 144 {
 145         int error, fd;
 146         struct stat sb;
 147         struct partinfo pinfo;
 148
 149         fd = fileno(fp);
 150
 151         error = fstat(fd, &sb);
 152         if (error != 0)
 153                 err(1, "%s: fstat", path);
 154
 155         if (S_ISREG(sb.st_mode))
 156                 return;
 157
 158         error = ioctl(fd, DIOCGPART, &pinfo);
 159         if (error != 0)
 160                 errx(1, "%s: not a disk", path);
 161 }
 162
 163 int
 164 main(int argc, char **argv)
 165 {
 166         int ch, error, i, nbytes;
 167         bool ignore_type = false, show_label = false, show_unmountable = false;
 168         char label[LABEL_LEN + 1], strvised[LABEL_LEN * 4 + 1];
 169         char *path;
 170         const char *name = NULL;
 171         FILE *fp;
 172         fstyp_function fstyp_f;
 173         fsvtyp_function fsvtyp_f;
 174
 175         while ((ch = getopt(argc, argv, "lsu")) != -1) {
 176                 switch (ch) {
 177                 case 'l':
 178                         show_label = true;
 179                         break;
 180                 case 's':
 181                         ignore_type = true;
 182                         break;
 183                 case 'u':
 184                         show_unmountable = true;
 185                         break;
 186                 default:
 187                         usage();
 188                 }
 189         }
 190
 191         argc -= optind;
 192         argv += optind;
 193         if (argc != 1)
 194                 usage();
 195
 196         path = argv[0];
 197
 198         fp = fopen(path, "r");
 199         if (fp == NULL)
 200                 goto fsvtyp; /* DragonFly */
 201
 202         if (ignore_type == false)
 203                 type_check(path, fp);
 204
 205         memset(label, '\0', sizeof(label));
 206
 207         for (i = 0;; i++) {
 208                 if (show_unmountable == false && fstypes[i].unmountable == true)
 209                         continue;
 210                 fstyp_f = fstypes[i].function;
 211                 if (fstyp_f == NULL)
 212                         break;
 213
 214                 error = fstyp_f(fp, label, sizeof(label));
 215                 if (error == 0) {
 216                         name = fstypes[i].name;
 217                         goto done;
 218                 }
 219         }
 220 fsvtyp:
 221         for (i = 0;; i++) {
 222                 if (show_unmountable == false && fsvtypes[i].unmountable == true)
 223                         continue;
 224                 fsvtyp_f = fsvtypes[i].function;
 225                 if (fsvtyp_f == NULL)
 226                         break;
 227
 228                 error = fsvtyp_f(path, label, sizeof(label));
 229                 if (error == 0) {
 230                         name = fsvtypes[i].name;
 231                         goto done;
 232                 }
 233         }
 234
 235         warnx("%s: filesystem not recognized", path);
 236         return (1);
 237 done:
 238         if (show_label && label[0] != '\0') {
 239                 /*
 240                  * XXX: I'd prefer VIS_HTTPSTYLE, but it unconditionally
 241                  *      encodes spaces.
 242                  * XXX: DragonFly doesn't have strsnvis().
 243                  */
 244                 nbytes = strnvis(strvised, label, sizeof(strvised),
 245                     VIS_GLOB | VIS_NL);
 246                 if (nbytes == -1)
 247                         err(1, "strnvis");
 248
 249                 printf("%s %s\n", name, strvised);
 250         } else {
 251                 printf("%s\n", name);
 252         }
 253
 254         return (0);
 255 }