1 /*- 2 * Copyright (c) 2014 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/capsicum.h> 35 #include <sys/disk.h> 36 #include <sys/ioctl.h> 37 #include <sys/stat.h> 38 #include <capsicum_helpers.h> 39 #include <err.h> 40 #include <errno.h> 41 #ifdef WITH_ICONV 42 #include <iconv.h> 43 #endif 44 #include <locale.h> 45 #include <stdbool.h> 46 #include <stddef.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include <vis.h> 52 53 #include "fstyp.h" 54 55 #define LABEL_LEN 256 56 57 bool show_label = false; 58 59 typedef int (*fstyp_function)(FILE *, char *, size_t); 60 61 static struct { 62 const char *name; 63 fstyp_function function; 64 bool unmountable; 65 char *precache_encoding; 66 } fstypes[] = { 67 { "apfs", &fstyp_apfs, true, NULL }, 68 { "cd9660", &fstyp_cd9660, false, NULL }, 69 { "exfat", &fstyp_exfat, false, EXFAT_ENC }, 70 { "ext2fs", &fstyp_ext2fs, false, NULL }, 71 { "geli", &fstyp_geli, true, NULL }, 72 { "hammer", &fstyp_hammer, true, NULL }, 73 { "hammer2", &fstyp_hammer2, true, NULL }, 74 { "hfs+", &fstyp_hfsp, false, NULL }, 75 { "msdosfs", &fstyp_msdosfs, false, NULL }, 76 { "ntfs", &fstyp_ntfs, false, NTFS_ENC }, 77 { "ufs", &fstyp_ufs, false, NULL }, 78 #ifdef HAVE_ZFS 79 { "zfs", &fstyp_zfs, true, NULL }, 80 #endif 81 { NULL, NULL, NULL, NULL } 82 }; 83 84 void * 85 read_buf(FILE *fp, off_t off, size_t len) 86 { 87 int error; 88 size_t nread; 89 void *buf; 90 91 error = fseek(fp, off, SEEK_SET); 92 if (error != 0) { 93 warn("cannot seek to %jd", (uintmax_t)off); 94 return (NULL); 95 } 96 97 buf = malloc(len); 98 if (buf == NULL) { 99 warn("cannot malloc %zd bytes of memory", len); 100 return (NULL); 101 } 102 103 nread = fread(buf, len, 1, fp); 104 if (nread != 1) { 105 free(buf); 106 if (feof(fp) == 0) 107 warn("fread"); 108 return (NULL); 109 } 110 111 return (buf); 112 } 113 114 char * 115 checked_strdup(const char *s) 116 { 117 char *c; 118 119 c = strdup(s); 120 if (c == NULL) 121 err(1, "strdup"); 122 return (c); 123 } 124 125 void 126 rtrim(char *label, size_t size) 127 { 128 ptrdiff_t i; 129 130 for (i = size - 1; i >= 0; i--) { 131 if (label[i] == '\0') 132 continue; 133 else if (label[i] == ' ') 134 label[i] = '\0'; 135 else 136 break; 137 } 138 } 139 140 static void 141 usage(void) 142 { 143 144 fprintf(stderr, "usage: fstyp [-l] [-s] [-u] special\n"); 145 exit(1); 146 } 147 148 static void 149 type_check(const char *path, FILE *fp) 150 { 151 int error, fd; 152 off_t mediasize; 153 struct stat sb; 154 155 fd = fileno(fp); 156 157 error = fstat(fd, &sb); 158 if (error != 0) 159 err(1, "%s: fstat", path); 160 161 if (S_ISREG(sb.st_mode)) 162 return; 163 164 error = ioctl(fd, DIOCGMEDIASIZE, &mediasize); 165 if (error != 0) 166 errx(1, "%s: not a disk", path); 167 } 168 169 int 170 main(int argc, char **argv) 171 { 172 int ch, error, i, nbytes; 173 bool ignore_type = false, show_unmountable = false; 174 char label[LABEL_LEN + 1], strvised[LABEL_LEN * 4 + 1]; 175 char *path; 176 FILE *fp; 177 fstyp_function fstyp_f; 178 179 while ((ch = getopt(argc, argv, "lsu")) != -1) { 180 switch (ch) { 181 case 'l': 182 show_label = true; 183 break; 184 case 's': 185 ignore_type = true; 186 break; 187 case 'u': 188 show_unmountable = true; 189 break; 190 default: 191 usage(); 192 } 193 } 194 195 argc -= optind; 196 argv += optind; 197 if (argc != 1) 198 usage(); 199 200 path = argv[0]; 201 202 if (setlocale(LC_CTYPE, "") == NULL) 203 err(1, "setlocale"); 204 caph_cache_catpages(); 205 206 #ifdef WITH_ICONV 207 /* Cache iconv conversion data before entering capability mode. */ 208 if (show_label) { 209 for (i = 0; i < nitems(fstypes); i++) { 210 iconv_t cd; 211 212 if (fstypes[i].precache_encoding == NULL) 213 continue; 214 cd = iconv_open("", fstypes[i].precache_encoding); 215 if (cd == (iconv_t)-1) 216 err(1, "%s: iconv_open %s", fstypes[i].name, 217 fstypes[i].precache_encoding); 218 /* Iconv keeps a small cache of unused encodings. */ 219 iconv_close(cd); 220 } 221 } 222 #endif 223 224 fp = fopen(path, "r"); 225 if (fp == NULL) 226 err(1, "%s", path); 227 228 if (caph_enter() < 0) 229 err(1, "cap_enter"); 230 231 if (ignore_type == false) 232 type_check(path, fp); 233 234 memset(label, '\0', sizeof(label)); 235 236 for (i = 0;; i++) { 237 if (show_unmountable == false && fstypes[i].unmountable == true) 238 continue; 239 fstyp_f = fstypes[i].function; 240 if (fstyp_f == NULL) 241 break; 242 243 error = fstyp_f(fp, label, sizeof(label)); 244 if (error == 0) 245 break; 246 } 247 248 if (fstypes[i].name == NULL) { 249 warnx("%s: filesystem not recognized", path); 250 return (1); 251 } 252 253 if (show_label && label[0] != '\0') { 254 /* 255 * XXX: I'd prefer VIS_HTTPSTYLE, but it unconditionally 256 * encodes spaces. 257 */ 258 nbytes = strsnvis(strvised, sizeof(strvised), label, 259 VIS_GLOB | VIS_NL, "\"'$"); 260 if (nbytes == -1) 261 err(1, "strsnvis"); 262 263 printf("%s %s\n", fstypes[i].name, strvised); 264 } else { 265 printf("%s\n", fstypes[i].name); 266 } 267 268 return (0); 269 } 270