/*- * 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 #include #include #include #include #include #include #ifdef WITH_ICONV #include #endif #include #include #include #include #include #include #include #include #include "fstyp.h" #define LABEL_LEN 256 bool show_label = false; typedef int (*fstyp_function)(FILE *, char *, size_t); /* * The ordering of fstypes[] is not arbitrary. * * fstyp checks the existence of a file system header to determine the * type of file system on a given device. For different file systems, * these headers reside at different offsets within the device. * * For example, the header for an MS-DOS file system begins at offset 0, * whereas a header for UFS *normally* begins at offset 64k. If a device * was constructed as MS-DOS and then repurposed as UFS (via newfs), it * is possible the MS-DOS header will still be intact. To prevent * misidentifying the file system, it is desirable to check the header * with the largest offset first (i.e., UFS before MS-DOS). */ static struct { const char *name; fstyp_function function; bool unmountable; const char *precache_encoding; } fstypes[] = { /* last sector of geli device */ { "geli", &fstyp_geli, true, NULL }, /* * ufs headers have four different areas, searched in this order: * offsets: 64k, 8k, 0k, 256k + 8192 bytes */ { "ufs", &fstyp_ufs, false, NULL }, /* offset 32768 + 512 bytes */ { "cd9660", &fstyp_cd9660, false, NULL }, /* offset 1024 + 512 bytes */ { "hfs+", &fstyp_hfsp, false, NULL }, /* offset 1024 + 512 bytes */ { "ext2fs", &fstyp_ext2fs, false, NULL }, /* offset 512 + 36 bytes */ { "befs", &fstyp_befs, false, NULL }, /* offset 0 + 40 bytes */ { "apfs", &fstyp_apfs, true, NULL }, /* offset 0 + 512 bytes (for initial signature check) */ { "exfat", &fstyp_exfat, false, EXFAT_ENC }, /* offset 0 + 1928 bytes */ { "hammer", &fstyp_hammer, true, NULL }, /* offset 0 + 65536 bytes (for initial signature check) */ { "hammer2", &fstyp_hammer2, true, NULL }, /* offset 0 + 512 bytes (for initial signature check) */ { "msdosfs", &fstyp_msdosfs, false, NULL }, /* offset 0 + 512 bytes (for initial signature check) */ { "ntfs", &fstyp_ntfs, false, NTFS_ENC }, #ifdef HAVE_ZFS /* offset 0 + 256k */ { "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') continue; else if (label[i] == ' ') label[i] = '\0'; 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 < (int)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', 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') { /* * 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); }