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