1 /* 2 * Copyright (c) 1998 Robert Nordier 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 21 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 23 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 25 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef lint 29 static const char rcsid[] = 30 "$FreeBSD$"; 31 #endif /* not lint */ 32 33 #include <sys/param.h> 34 #include <sys/fdcio.h> 35 #include <sys/disk.h> 36 #include <sys/disklabel.h> 37 #include <sys/mount.h> 38 #include <sys/stat.h> 39 #include <sys/time.h> 40 41 #include <ctype.h> 42 #include <err.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <inttypes.h> 46 #include <paths.h> 47 #include <signal.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <time.h> 52 #include <unistd.h> 53 54 #include "mkfs_msdos.h" 55 56 #define MAXU16 0xffff /* maximum unsigned 16-bit quantity */ 57 #define BPN 4 /* bits per nibble */ 58 #define NPB 2 /* nibbles per byte */ 59 60 #define DOSMAGIC 0xaa55 /* DOS magic number */ 61 #define MINBPS 512 /* minimum bytes per sector */ 62 #define MAXSPC 128 /* maximum sectors per cluster */ 63 #define MAXNFT 16 /* maximum number of FATs */ 64 #define DEFBLK 4096 /* default block size */ 65 #define DEFBLK16 2048 /* default block size FAT16 */ 66 #define DEFRDE 512 /* default root directory entries */ 67 #define RESFTE 2 /* reserved FAT entries */ 68 #define MINCLS12 1U /* minimum FAT12 clusters */ 69 #define MINCLS16 0xff5U /* minimum FAT16 clusters */ 70 #define MINCLS32 0xfff5U /* minimum FAT32 clusters */ 71 #define MAXCLS12 0xff4U /* maximum FAT12 clusters */ 72 #define MAXCLS16 0xfff4U /* maximum FAT16 clusters */ 73 #define MAXCLS32 0xffffff4U /* maximum FAT32 clusters */ 74 75 #define mincls(fat) ((fat) == 12 ? MINCLS12 : \ 76 (fat) == 16 ? MINCLS16 : \ 77 MINCLS32) 78 79 #define maxcls(fat) ((fat) == 12 ? MAXCLS12 : \ 80 (fat) == 16 ? MAXCLS16 : \ 81 MAXCLS32) 82 83 #define mk1(p, x) \ 84 (p) = (u_int8_t)(x) 85 86 #define mk2(p, x) \ 87 (p)[0] = (u_int8_t)(x), \ 88 (p)[1] = (u_int8_t)((x) >> 010) 89 90 #define mk4(p, x) \ 91 (p)[0] = (u_int8_t)(x), \ 92 (p)[1] = (u_int8_t)((x) >> 010), \ 93 (p)[2] = (u_int8_t)((x) >> 020), \ 94 (p)[3] = (u_int8_t)((x) >> 030) 95 96 struct bs { 97 u_int8_t bsJump[3]; /* bootstrap entry point */ 98 u_int8_t bsOemName[8]; /* OEM name and version */ 99 } __packed; 100 101 struct bsbpb { 102 u_int8_t bpbBytesPerSec[2]; /* bytes per sector */ 103 u_int8_t bpbSecPerClust; /* sectors per cluster */ 104 u_int8_t bpbResSectors[2]; /* reserved sectors */ 105 u_int8_t bpbFATs; /* number of FATs */ 106 u_int8_t bpbRootDirEnts[2]; /* root directory entries */ 107 u_int8_t bpbSectors[2]; /* total sectors */ 108 u_int8_t bpbMedia; /* media descriptor */ 109 u_int8_t bpbFATsecs[2]; /* sectors per FAT */ 110 u_int8_t bpbSecPerTrack[2]; /* sectors per track */ 111 u_int8_t bpbHeads[2]; /* drive heads */ 112 u_int8_t bpbHiddenSecs[4]; /* hidden sectors */ 113 u_int8_t bpbHugeSectors[4]; /* big total sectors */ 114 } __packed; 115 116 struct bsxbpb { 117 u_int8_t bpbBigFATsecs[4]; /* big sectors per FAT */ 118 u_int8_t bpbExtFlags[2]; /* FAT control flags */ 119 u_int8_t bpbFSVers[2]; /* file system version */ 120 u_int8_t bpbRootClust[4]; /* root directory start cluster */ 121 u_int8_t bpbFSInfo[2]; /* file system info sector */ 122 u_int8_t bpbBackup[2]; /* backup boot sector */ 123 u_int8_t bpbReserved[12]; /* reserved */ 124 } __packed; 125 126 struct bsx { 127 u_int8_t exDriveNumber; /* drive number */ 128 u_int8_t exReserved1; /* reserved */ 129 u_int8_t exBootSignature; /* extended boot signature */ 130 u_int8_t exVolumeID[4]; /* volume ID number */ 131 u_int8_t exVolumeLabel[11]; /* volume label */ 132 u_int8_t exFileSysType[8]; /* file system type */ 133 } __packed; 134 135 struct de { 136 u_int8_t deName[11]; /* name and extension */ 137 u_int8_t deAttributes; /* attributes */ 138 u_int8_t rsvd[10]; /* reserved */ 139 u_int8_t deMTime[2]; /* last-modified time */ 140 u_int8_t deMDate[2]; /* last-modified date */ 141 u_int8_t deStartCluster[2]; /* starting cluster */ 142 u_int8_t deFileSize[4]; /* size */ 143 } __packed; 144 145 struct bpb { 146 u_int bpbBytesPerSec; /* bytes per sector */ 147 u_int bpbSecPerClust; /* sectors per cluster */ 148 u_int bpbResSectors; /* reserved sectors */ 149 u_int bpbFATs; /* number of FATs */ 150 u_int bpbRootDirEnts; /* root directory entries */ 151 u_int bpbSectors; /* total sectors */ 152 u_int bpbMedia; /* media descriptor */ 153 u_int bpbFATsecs; /* sectors per FAT */ 154 u_int bpbSecPerTrack; /* sectors per track */ 155 u_int bpbHeads; /* drive heads */ 156 u_int bpbHiddenSecs; /* hidden sectors */ 157 u_int bpbHugeSectors; /* big total sectors */ 158 u_int bpbBigFATsecs; /* big sectors per FAT */ 159 u_int bpbRootClust; /* root directory start cluster */ 160 u_int bpbFSInfo; /* file system info sector */ 161 u_int bpbBackup; /* backup boot sector */ 162 }; 163 164 #define BPBGAP 0, 0, 0, 0, 0, 0 165 166 static struct { 167 const char *name; 168 struct bpb bpb; 169 } const stdfmt[] = { 170 {"160", {512, 1, 1, 2, 64, 320, 0xfe, 1, 8, 1, BPBGAP}}, 171 {"180", {512, 1, 1, 2, 64, 360, 0xfc, 2, 9, 1, BPBGAP}}, 172 {"320", {512, 2, 1, 2, 112, 640, 0xff, 1, 8, 2, BPBGAP}}, 173 {"360", {512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2, BPBGAP}}, 174 {"640", {512, 2, 1, 2, 112, 1280, 0xfb, 2, 8, 2, BPBGAP}}, 175 {"720", {512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2, BPBGAP}}, 176 {"1200", {512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2, BPBGAP}}, 177 {"1232", {1024,1, 1, 2, 192, 1232, 0xfe, 2, 8, 2, BPBGAP}}, 178 {"1440", {512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2, BPBGAP}}, 179 {"2880", {512, 2, 1, 2, 240, 5760, 0xf0, 9, 36, 2, BPBGAP}} 180 }; 181 182 static const u_int8_t bootcode[] = { 183 0xfa, /* cli */ 184 0x31, 0xc0, /* xor ax,ax */ 185 0x8e, 0xd0, /* mov ss,ax */ 186 0xbc, 0x00, 0x7c, /* mov sp,7c00h */ 187 0xfb, /* sti */ 188 0x8e, 0xd8, /* mov ds,ax */ 189 0xe8, 0x00, 0x00, /* call $ + 3 */ 190 0x5e, /* pop si */ 191 0x83, 0xc6, 0x19, /* add si,+19h */ 192 0xbb, 0x07, 0x00, /* mov bx,0007h */ 193 0xfc, /* cld */ 194 0xac, /* lodsb */ 195 0x84, 0xc0, /* test al,al */ 196 0x74, 0x06, /* jz $ + 8 */ 197 0xb4, 0x0e, /* mov ah,0eh */ 198 0xcd, 0x10, /* int 10h */ 199 0xeb, 0xf5, /* jmp $ - 9 */ 200 0x30, 0xe4, /* xor ah,ah */ 201 0xcd, 0x16, /* int 16h */ 202 0xcd, 0x19, /* int 19h */ 203 0x0d, 0x0a, 204 'N', 'o', 'n', '-', 's', 'y', 's', 't', 205 'e', 'm', ' ', 'd', 'i', 's', 'k', 206 0x0d, 0x0a, 207 'P', 'r', 'e', 's', 's', ' ', 'a', 'n', 208 'y', ' ', 'k', 'e', 'y', ' ', 't', 'o', 209 ' ', 'r', 'e', 'b', 'o', 'o', 't', 210 0x0d, 0x0a, 211 0 212 }; 213 214 static volatile sig_atomic_t got_siginfo; 215 static void infohandler(int); 216 217 static int check_mounted(const char *, mode_t); 218 static int getstdfmt(const char *, struct bpb *); 219 static int getdiskinfo(int, const char *, const char *, int, struct bpb *); 220 static void print_bpb(struct bpb *); 221 static int ckgeom(const char *, u_int, const char *); 222 static void mklabel(u_int8_t *, const char *); 223 static int oklabel(const char *); 224 static void setstr(u_int8_t *, const char *, size_t); 225 226 int 227 mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op) 228 { 229 char buf[MAXPATHLEN]; 230 struct sigaction si_sa; 231 struct stat sb; 232 struct timeval tv; 233 struct bpb bpb; 234 struct tm *tm; 235 struct bs *bs; 236 struct bsbpb *bsbpb; 237 struct bsxbpb *bsxbpb; 238 struct bsx *bsx; 239 struct de *de; 240 u_int8_t *img; 241 const char *bname; 242 ssize_t n; 243 time_t now; 244 u_int fat, bss, rds, cls, dir, lsn, x, x1, x2; 245 u_int extra_res, alignment, saved_x, attempts=0; 246 bool set_res, set_spf, set_spc; 247 int fd, fd1, rv; 248 struct msdos_options o = *op; 249 250 img = NULL; 251 rv = -1; 252 fd = fd1 = -1; 253 254 if (o.block_size && o.sectors_per_cluster) { 255 warnx("Cannot specify both block size and sectors per cluster"); 256 goto done; 257 } 258 if (o.OEM_string && strlen(o.OEM_string) > 8) { 259 warnx("%s: bad OEM string", o.OEM_string); 260 goto done; 261 } 262 if (o.create_size) { 263 if (o.no_create) { 264 warnx("create (-C) is incompatible with -N"); 265 goto done; 266 } 267 fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644); 268 if (fd == -1) { 269 warnx("failed to create %s", fname); 270 goto done; 271 } 272 if (ftruncate(fd, o.create_size)) { 273 warnx("failed to initialize %jd bytes", (intmax_t)o.create_size); 274 goto done; 275 } 276 } else if ((fd = open(fname, o.no_create ? O_RDONLY : O_RDWR)) == -1) { 277 warn("%s", fname); 278 goto done; 279 } 280 if (fstat(fd, &sb)) { 281 warn("%s", fname); 282 goto done; 283 } 284 if (o.create_size) { 285 if (!S_ISREG(sb.st_mode)) 286 warnx("warning, %s is not a regular file", fname); 287 } else { 288 if (!S_ISCHR(sb.st_mode)) 289 warnx("warning, %s is not a character device", fname); 290 } 291 if (!o.no_create) 292 if (check_mounted(fname, sb.st_mode) == -1) 293 goto done; 294 if (o.offset && o.offset != lseek(fd, o.offset, SEEK_SET)) { 295 warnx("cannot seek to %jd", (intmax_t)o.offset); 296 goto done; 297 } 298 memset(&bpb, 0, sizeof(bpb)); 299 if (o.floppy) { 300 if (getstdfmt(o.floppy, &bpb) == -1) 301 goto done; 302 bpb.bpbHugeSectors = bpb.bpbSectors; 303 bpb.bpbSectors = 0; 304 bpb.bpbBigFATsecs = bpb.bpbFATsecs; 305 bpb.bpbFATsecs = 0; 306 } 307 if (o.drive_heads) 308 bpb.bpbHeads = o.drive_heads; 309 if (o.sectors_per_track) 310 bpb.bpbSecPerTrack = o.sectors_per_track; 311 if (o.bytes_per_sector) 312 bpb.bpbBytesPerSec = o.bytes_per_sector; 313 if (o.size) 314 bpb.bpbHugeSectors = o.size; 315 if (o.hidden_sectors_set) 316 bpb.bpbHiddenSecs = o.hidden_sectors; 317 if (!(o.floppy || (o.drive_heads && o.sectors_per_track && 318 o.bytes_per_sector && o.size && o.hidden_sectors_set))) { 319 getdiskinfo(fd, fname, dtype, o.hidden_sectors_set, &bpb); 320 bpb.bpbHugeSectors -= (o.offset / bpb.bpbBytesPerSec); 321 if (bpb.bpbSecPerClust == 0) { /* set defaults */ 322 if (bpb.bpbHugeSectors <= 6000) /* about 3MB -> 512 bytes */ 323 bpb.bpbSecPerClust = 1; 324 else if (bpb.bpbHugeSectors <= (1<<17)) /* 64M -> 4k */ 325 bpb.bpbSecPerClust = 8; 326 else if (bpb.bpbHugeSectors <= (1<<19)) /* 256M -> 8k */ 327 bpb.bpbSecPerClust = 16; 328 else if (bpb.bpbHugeSectors <= (1<<21)) /* 1G -> 16k */ 329 bpb.bpbSecPerClust = 32; 330 else 331 bpb.bpbSecPerClust = 64; /* otherwise 32k */ 332 } 333 } 334 if (!powerof2(bpb.bpbBytesPerSec)) { 335 warnx("bytes/sector (%u) is not a power of 2", bpb.bpbBytesPerSec); 336 goto done; 337 } 338 if (bpb.bpbBytesPerSec < MINBPS) { 339 warnx("bytes/sector (%u) is too small; minimum is %u", 340 bpb.bpbBytesPerSec, MINBPS); 341 goto done; 342 } 343 344 if (o.volume_label && !oklabel(o.volume_label)) { 345 warnx("%s: bad volume label", o.volume_label); 346 goto done; 347 } 348 if (!(fat = o.fat_type)) { 349 if (o.floppy) 350 fat = 12; 351 else if (!o.directory_entries && (o.info_sector || o.backup_sector)) 352 fat = 32; 353 } 354 if ((fat == 32 && o.directory_entries) || (fat != 32 && (o.info_sector || o.backup_sector))) { 355 warnx("-%c is not a legal FAT%s option", 356 fat == 32 ? 'e' : o.info_sector ? 'i' : 'k', 357 fat == 32 ? "32" : "12/16"); 358 goto done; 359 } 360 if (o.floppy && fat == 32) 361 bpb.bpbRootDirEnts = 0; 362 if (fat != 0 && fat != 12 && fat != 16 && fat != 32) { 363 warnx("%d: bad FAT type", fat); 364 goto done; 365 } 366 367 if (o.block_size) { 368 if (!powerof2(o.block_size)) { 369 warnx("block size (%u) is not a power of 2", o.block_size); 370 goto done; 371 } 372 if (o.block_size < bpb.bpbBytesPerSec) { 373 warnx("block size (%u) is too small; minimum is %u", 374 o.block_size, bpb.bpbBytesPerSec); 375 goto done; 376 } 377 if (o.block_size > bpb.bpbBytesPerSec * MAXSPC) { 378 warnx("block size (%u) is too large; maximum is %u", 379 o.block_size, bpb.bpbBytesPerSec * MAXSPC); 380 goto done; 381 } 382 bpb.bpbSecPerClust = o.block_size / bpb.bpbBytesPerSec; 383 } 384 if (o.sectors_per_cluster) { 385 if (!powerof2(o.sectors_per_cluster)) { 386 warnx("sectors/cluster (%u) is not a power of 2", 387 o.sectors_per_cluster); 388 goto done; 389 } 390 bpb.bpbSecPerClust = o.sectors_per_cluster; 391 } 392 if (o.reserved_sectors) 393 bpb.bpbResSectors = o.reserved_sectors; 394 if (o.num_FAT) { 395 if (o.num_FAT > MAXNFT) { 396 warnx("number of FATs (%u) is too large; maximum is %u", 397 o.num_FAT, MAXNFT); 398 goto done; 399 } 400 bpb.bpbFATs = o.num_FAT; 401 } 402 if (o.directory_entries) 403 bpb.bpbRootDirEnts = o.directory_entries; 404 if (o.media_descriptor_set) { 405 if (o.media_descriptor < 0xf0) { 406 warnx("illegal media descriptor (%#x)", o.media_descriptor); 407 goto done; 408 } 409 bpb.bpbMedia = o.media_descriptor; 410 } 411 if (o.sectors_per_fat) 412 bpb.bpbBigFATsecs = o.sectors_per_fat; 413 if (o.info_sector) 414 bpb.bpbFSInfo = o.info_sector; 415 if (o.backup_sector) 416 bpb.bpbBackup = o.backup_sector; 417 bss = 1; 418 bname = NULL; 419 fd1 = -1; 420 if (o.bootstrap) { 421 bname = o.bootstrap; 422 if (!strchr(bname, '/')) { 423 snprintf(buf, sizeof(buf), "/boot/%s", bname); 424 if (!(bname = strdup(buf))) { 425 warn(NULL); 426 goto done; 427 } 428 } 429 if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb)) { 430 warn("%s", bname); 431 goto done; 432 } 433 if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bpbBytesPerSec || 434 sb.st_size < bpb.bpbBytesPerSec || 435 sb.st_size > bpb.bpbBytesPerSec * MAXU16) { 436 warnx("%s: inappropriate file type or format", bname); 437 goto done; 438 } 439 bss = sb.st_size / bpb.bpbBytesPerSec; 440 } 441 if (!bpb.bpbFATs) 442 bpb.bpbFATs = 2; 443 if (!fat) { 444 if (bpb.bpbHugeSectors < (bpb.bpbResSectors ? bpb.bpbResSectors : bss) + 445 howmany((RESFTE + (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1)) * 446 (bpb.bpbSecPerClust ? 16 : 12) / BPN, 447 bpb.bpbBytesPerSec * NPB) * 448 bpb.bpbFATs + 449 howmany(bpb.bpbRootDirEnts ? bpb.bpbRootDirEnts : DEFRDE, 450 bpb.bpbBytesPerSec / sizeof(struct de)) + 451 (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1) * 452 (bpb.bpbSecPerClust ? bpb.bpbSecPerClust : 453 howmany(DEFBLK, bpb.bpbBytesPerSec))) 454 fat = 12; 455 else if (bpb.bpbRootDirEnts || bpb.bpbHugeSectors < 456 (bpb.bpbResSectors ? bpb.bpbResSectors : bss) + 457 howmany((RESFTE + MAXCLS16) * 2, bpb.bpbBytesPerSec) * 458 bpb.bpbFATs + 459 howmany(DEFRDE, bpb.bpbBytesPerSec / sizeof(struct de)) + 460 (MAXCLS16 + 1) * 461 (bpb.bpbSecPerClust ? bpb.bpbSecPerClust : 462 howmany(8192, bpb.bpbBytesPerSec))) 463 fat = 16; 464 else 465 fat = 32; 466 } 467 x = bss; 468 if (fat == 32) { 469 if (!bpb.bpbFSInfo) { 470 if (x == MAXU16 || x == bpb.bpbBackup) { 471 warnx("no room for info sector"); 472 goto done; 473 } 474 bpb.bpbFSInfo = x; 475 } 476 if (bpb.bpbFSInfo != MAXU16 && x <= bpb.bpbFSInfo) 477 x = bpb.bpbFSInfo + 1; 478 if (!bpb.bpbBackup) { 479 if (x == MAXU16) { 480 warnx("no room for backup sector"); 481 goto done; 482 } 483 bpb.bpbBackup = x; 484 } else if (bpb.bpbBackup != MAXU16 && bpb.bpbBackup == bpb.bpbFSInfo) { 485 warnx("backup sector would overwrite info sector"); 486 goto done; 487 } 488 if (bpb.bpbBackup != MAXU16 && x <= bpb.bpbBackup) 489 x = bpb.bpbBackup + 1; 490 } 491 492 extra_res = 0; 493 alignment = 0; 494 set_res = (bpb.bpbResSectors == 0); 495 set_spf = (bpb.bpbBigFATsecs == 0); 496 set_spc = (bpb.bpbSecPerClust == 0); 497 saved_x = x; 498 499 /* 500 * Attempt to align the root directory to cluster if o.align is set. 501 * This is done by padding with reserved blocks. Note that this can 502 * cause other factors to change, which can in turn change the alignment. 503 * This should take at most 2 iterations, as increasing the reserved 504 * amount may cause the FAT size to decrease by 1, requiring another 505 * bpbFATs reserved blocks. If bpbSecPerClust changes, it will 506 * be half of its previous size, and thus will not throw off alignment. 507 */ 508 do { 509 x = saved_x; 510 if (set_res) 511 bpb.bpbResSectors = ((fat == 32) ? 512 MAX(x, MAX(16384 / bpb.bpbBytesPerSec, 4)) : x) + extra_res; 513 else if (bpb.bpbResSectors < x) { 514 warnx("too few reserved sectors (need %d have %d)", x, 515 bpb.bpbResSectors); 516 goto done; 517 } 518 if (fat != 32 && !bpb.bpbRootDirEnts) 519 bpb.bpbRootDirEnts = DEFRDE; 520 rds = howmany(bpb.bpbRootDirEnts, 521 bpb.bpbBytesPerSec / sizeof(struct de)); 522 if (set_spc) { 523 for (bpb.bpbSecPerClust = howmany(fat == 16 ? DEFBLK16 : 524 DEFBLK, bpb.bpbBytesPerSec); 525 bpb.bpbSecPerClust < MAXSPC && (bpb.bpbResSectors + 526 howmany((RESFTE + maxcls(fat)) * (fat / BPN), 527 bpb.bpbBytesPerSec * NPB) * bpb.bpbFATs + 528 rds + 529 (u_int64_t) (maxcls(fat) + 1) * bpb.bpbSecPerClust) <= 530 bpb.bpbHugeSectors; 531 bpb.bpbSecPerClust <<= 1) 532 continue; 533 534 } 535 if (fat != 32 && bpb.bpbBigFATsecs > MAXU16) { 536 warnx("too many sectors/FAT for FAT12/16"); 537 goto done; 538 } 539 x1 = bpb.bpbResSectors + rds; 540 x = bpb.bpbBigFATsecs ? bpb.bpbBigFATsecs : 1; 541 if (x1 + (u_int64_t)x * bpb.bpbFATs > bpb.bpbHugeSectors) { 542 warnx("meta data exceeds file system size"); 543 goto done; 544 } 545 x1 += x * bpb.bpbFATs; 546 x = (u_int64_t)(bpb.bpbHugeSectors - x1) * bpb.bpbBytesPerSec * NPB / 547 (bpb.bpbSecPerClust * bpb.bpbBytesPerSec * NPB + 548 fat / BPN * bpb.bpbFATs); 549 x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN), 550 bpb.bpbBytesPerSec * NPB); 551 if (set_spf) { 552 if (bpb.bpbBigFATsecs == 0) 553 bpb.bpbBigFATsecs = x2; 554 x1 += (bpb.bpbBigFATsecs - 1) * bpb.bpbFATs; 555 } 556 if (set_res) { 557 /* attempt to align root directory */ 558 alignment = (bpb.bpbResSectors + bpb.bpbBigFATsecs * bpb.bpbFATs) % 559 bpb.bpbSecPerClust; 560 if (o.align) 561 extra_res += bpb.bpbSecPerClust - alignment; 562 } 563 attempts++; 564 } while (o.align && alignment != 0 && attempts < 2); 565 if (o.align && alignment != 0) 566 warnx("warning: Alignment failed."); 567 568 cls = (bpb.bpbHugeSectors - x1) / bpb.bpbSecPerClust; 569 x = (u_int64_t)bpb.bpbBigFATsecs * bpb.bpbBytesPerSec * NPB / (fat / BPN) - 570 RESFTE; 571 if (cls > x) 572 cls = x; 573 if (bpb.bpbBigFATsecs < x2) 574 warnx("warning: sectors/FAT limits file system to %u clusters", 575 cls); 576 if (cls < mincls(fat)) { 577 warnx("%u clusters too few clusters for FAT%u, need %u", cls, fat, 578 mincls(fat)); 579 goto done; 580 } 581 if (cls > maxcls(fat)) { 582 cls = maxcls(fat); 583 bpb.bpbHugeSectors = x1 + (cls + 1) * bpb.bpbSecPerClust - 1; 584 warnx("warning: FAT type limits file system to %u sectors", 585 bpb.bpbHugeSectors); 586 } 587 printf("%s: %u sector%s in %u FAT%u cluster%s " 588 "(%u bytes/cluster)\n", fname, cls * bpb.bpbSecPerClust, 589 cls * bpb.bpbSecPerClust == 1 ? "" : "s", cls, fat, 590 cls == 1 ? "" : "s", bpb.bpbBytesPerSec * bpb.bpbSecPerClust); 591 if (!bpb.bpbMedia) 592 bpb.bpbMedia = !bpb.bpbHiddenSecs ? 0xf0 : 0xf8; 593 if (fat == 32) 594 bpb.bpbRootClust = RESFTE; 595 if (bpb.bpbHugeSectors <= MAXU16) { 596 bpb.bpbSectors = bpb.bpbHugeSectors; 597 bpb.bpbHugeSectors = 0; 598 } 599 if (fat != 32) { 600 bpb.bpbFATsecs = bpb.bpbBigFATsecs; 601 bpb.bpbBigFATsecs = 0; 602 } 603 print_bpb(&bpb); 604 if (!o.no_create) { 605 if (o.timestamp_set) { 606 tv.tv_sec = now = o.timestamp; 607 tv.tv_usec = 0; 608 tm = gmtime(&now); 609 } else { 610 gettimeofday(&tv, NULL); 611 now = tv.tv_sec; 612 tm = localtime(&now); 613 } 614 615 616 if (!(img = malloc(bpb.bpbBytesPerSec))) { 617 warn(NULL); 618 goto done; 619 } 620 dir = bpb.bpbResSectors + (bpb.bpbFATsecs ? bpb.bpbFATsecs : 621 bpb.bpbBigFATsecs) * bpb.bpbFATs; 622 memset(&si_sa, 0, sizeof(si_sa)); 623 si_sa.sa_handler = infohandler; 624 if (sigaction(SIGINFO, &si_sa, NULL) == -1) { 625 warn("sigaction SIGINFO"); 626 goto done; 627 } 628 for (lsn = 0; lsn < dir + (fat == 32 ? bpb.bpbSecPerClust : rds); lsn++) { 629 if (got_siginfo) { 630 fprintf(stderr,"%s: writing sector %u of %u (%u%%)\n", 631 fname, lsn, 632 (dir + (fat == 32 ? bpb.bpbSecPerClust: rds)), 633 (lsn * 100) / (dir + 634 (fat == 32 ? bpb.bpbSecPerClust: rds))); 635 got_siginfo = 0; 636 } 637 x = lsn; 638 if (o.bootstrap && 639 fat == 32 && bpb.bpbBackup != MAXU16 && 640 bss <= bpb.bpbBackup && x >= bpb.bpbBackup) { 641 x -= bpb.bpbBackup; 642 if (!x && lseek(fd1, o.offset, SEEK_SET)) { 643 warn("%s", bname); 644 goto done; 645 } 646 } 647 if (o.bootstrap && x < bss) { 648 if ((n = read(fd1, img, bpb.bpbBytesPerSec)) == -1) { 649 warn("%s", bname); 650 goto done; 651 } 652 if ((unsigned)n != bpb.bpbBytesPerSec) { 653 warnx("%s: can't read sector %u", bname, x); 654 goto done; 655 } 656 } else 657 memset(img, 0, bpb.bpbBytesPerSec); 658 if (!lsn || 659 (fat == 32 && bpb.bpbBackup != MAXU16 && 660 lsn == bpb.bpbBackup)) { 661 x1 = sizeof(struct bs); 662 bsbpb = (struct bsbpb *)(img + x1); 663 mk2(bsbpb->bpbBytesPerSec, bpb.bpbBytesPerSec); 664 mk1(bsbpb->bpbSecPerClust, bpb.bpbSecPerClust); 665 mk2(bsbpb->bpbResSectors, bpb.bpbResSectors); 666 mk1(bsbpb->bpbFATs, bpb.bpbFATs); 667 mk2(bsbpb->bpbRootDirEnts, bpb.bpbRootDirEnts); 668 mk2(bsbpb->bpbSectors, bpb.bpbSectors); 669 mk1(bsbpb->bpbMedia, bpb.bpbMedia); 670 mk2(bsbpb->bpbFATsecs, bpb.bpbFATsecs); 671 mk2(bsbpb->bpbSecPerTrack, bpb.bpbSecPerTrack); 672 mk2(bsbpb->bpbHeads, bpb.bpbHeads); 673 mk4(bsbpb->bpbHiddenSecs, bpb.bpbHiddenSecs); 674 mk4(bsbpb->bpbHugeSectors, bpb.bpbHugeSectors); 675 x1 += sizeof(struct bsbpb); 676 if (fat == 32) { 677 bsxbpb = (struct bsxbpb *)(img + x1); 678 mk4(bsxbpb->bpbBigFATsecs, bpb.bpbBigFATsecs); 679 mk2(bsxbpb->bpbExtFlags, 0); 680 mk2(bsxbpb->bpbFSVers, 0); 681 mk4(bsxbpb->bpbRootClust, bpb.bpbRootClust); 682 mk2(bsxbpb->bpbFSInfo, bpb.bpbFSInfo); 683 mk2(bsxbpb->bpbBackup, bpb.bpbBackup); 684 x1 += sizeof(struct bsxbpb); 685 } 686 bsx = (struct bsx *)(img + x1); 687 mk1(bsx->exBootSignature, 0x29); 688 if (o.volume_id_set) 689 x = o.volume_id; 690 else 691 x = (((u_int)(1 + tm->tm_mon) << 8 | 692 (u_int)tm->tm_mday) + 693 ((u_int)tm->tm_sec << 8 | 694 (u_int)(tv.tv_usec / 10))) << 16 | 695 ((u_int)(1900 + tm->tm_year) + 696 ((u_int)tm->tm_hour << 8 | 697 (u_int)tm->tm_min)); 698 mk4(bsx->exVolumeID, x); 699 mklabel(bsx->exVolumeLabel, o.volume_label ? o.volume_label : "NO NAME"); 700 snprintf(buf, sizeof(buf), "FAT%u", fat); 701 setstr(bsx->exFileSysType, buf, sizeof(bsx->exFileSysType)); 702 if (!o.bootstrap) { 703 x1 += sizeof(struct bsx); 704 bs = (struct bs *)img; 705 mk1(bs->bsJump[0], 0xeb); 706 mk1(bs->bsJump[1], x1 - 2); 707 mk1(bs->bsJump[2], 0x90); 708 setstr(bs->bsOemName, o.OEM_string ? o.OEM_string : "BSD4.4 ", 709 sizeof(bs->bsOemName)); 710 memcpy(img + x1, bootcode, sizeof(bootcode)); 711 mk2(img + MINBPS - 2, DOSMAGIC); 712 } 713 } else if (fat == 32 && bpb.bpbFSInfo != MAXU16 && 714 (lsn == bpb.bpbFSInfo || 715 (bpb.bpbBackup != MAXU16 && 716 lsn == bpb.bpbBackup + bpb.bpbFSInfo))) { 717 mk4(img, 0x41615252); 718 mk4(img + MINBPS - 28, 0x61417272); 719 mk4(img + MINBPS - 24, 0xffffffff); 720 mk4(img + MINBPS - 20, bpb.bpbRootClust); 721 mk2(img + MINBPS - 2, DOSMAGIC); 722 } else if (lsn >= bpb.bpbResSectors && lsn < dir && 723 !((lsn - bpb.bpbResSectors) % 724 (bpb.bpbFATsecs ? bpb.bpbFATsecs : 725 bpb.bpbBigFATsecs))) { 726 mk1(img[0], bpb.bpbMedia); 727 for (x = 1; x < fat * (fat == 32 ? 3 : 2) / 8; x++) 728 mk1(img[x], fat == 32 && x % 4 == 3 ? 0x0f : 0xff); 729 } else if (lsn == dir && o.volume_label) { 730 de = (struct de *)img; 731 mklabel(de->deName, o.volume_label); 732 mk1(de->deAttributes, 050); 733 x = (u_int)tm->tm_hour << 11 | 734 (u_int)tm->tm_min << 5 | 735 (u_int)tm->tm_sec >> 1; 736 mk2(de->deMTime, x); 737 x = (u_int)(tm->tm_year - 80) << 9 | 738 (u_int)(tm->tm_mon + 1) << 5 | 739 (u_int)tm->tm_mday; 740 mk2(de->deMDate, x); 741 } 742 if ((n = write(fd, img, bpb.bpbBytesPerSec)) == -1) { 743 warn("%s", fname); 744 goto done; 745 } 746 if ((unsigned)n != bpb.bpbBytesPerSec) { 747 warnx("%s: can't write sector %u", fname, lsn); 748 goto done; 749 } 750 } 751 } 752 rv = 0; 753 done: 754 free(img); 755 if (fd != -1) 756 close(fd); 757 if (fd1 != -1) 758 close(fd1); 759 760 return rv; 761 } 762 763 /* 764 * return -1 with error if file system is mounted. 765 */ 766 static int 767 check_mounted(const char *fname, mode_t mode) 768 { 769 struct statfs *mp; 770 const char *s1, *s2; 771 size_t len; 772 int n, r; 773 774 if (!(n = getmntinfo(&mp, MNT_NOWAIT))) { 775 warn("getmntinfo"); 776 return -1; 777 } 778 len = strlen(_PATH_DEV); 779 s1 = fname; 780 if (!strncmp(s1, _PATH_DEV, len)) 781 s1 += len; 782 r = S_ISCHR(mode) && s1 != fname && *s1 == 'r'; 783 for (; n--; mp++) { 784 s2 = mp->f_mntfromname; 785 if (!strncmp(s2, _PATH_DEV, len)) 786 s2 += len; 787 if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) || 788 !strcmp(s1, s2)) { 789 warnx("%s is mounted on %s", fname, mp->f_mntonname); 790 return -1; 791 } 792 } 793 return 0; 794 } 795 796 /* 797 * Get a standard format. 798 */ 799 static int 800 getstdfmt(const char *fmt, struct bpb *bpb) 801 { 802 u_int x, i; 803 804 x = nitems(stdfmt); 805 for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++); 806 if (i == x) { 807 warnx("%s: unknown standard format", fmt); 808 return -1; 809 } 810 *bpb = stdfmt[i].bpb; 811 return 0; 812 } 813 814 /* 815 * Get disk slice, partition, and geometry information. 816 */ 817 static int 818 getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag, 819 struct bpb *bpb) 820 { 821 struct disklabel *lp, dlp; 822 struct fd_type type; 823 off_t ms, hs = 0; 824 825 lp = NULL; 826 827 /* If the user specified a disk type, try to use that */ 828 if (dtype != NULL) { 829 lp = getdiskbyname(dtype); 830 } 831 832 /* Maybe it's a floppy drive */ 833 if (lp == NULL) { 834 if (ioctl(fd, DIOCGMEDIASIZE, &ms) == -1) { 835 struct stat st; 836 837 if (fstat(fd, &st)) 838 err(1, "cannot get disk size"); 839 /* create a fake geometry for a file image */ 840 ms = st.st_size; 841 dlp.d_secsize = 512; 842 dlp.d_nsectors = 63; 843 dlp.d_ntracks = 255; 844 dlp.d_secperunit = ms / dlp.d_secsize; 845 lp = &dlp; 846 } else if (ioctl(fd, FD_GTYPE, &type) != -1) { 847 dlp.d_secsize = 128 << type.secsize; 848 dlp.d_nsectors = type.sectrac; 849 dlp.d_ntracks = type.heads; 850 dlp.d_secperunit = ms / dlp.d_secsize; 851 lp = &dlp; 852 } 853 } 854 855 /* Maybe it's a fixed drive */ 856 if (lp == NULL) { 857 if (bpb->bpbBytesPerSec) 858 dlp.d_secsize = bpb->bpbBytesPerSec; 859 if (bpb->bpbBytesPerSec == 0 && ioctl(fd, DIOCGSECTORSIZE, 860 &dlp.d_secsize) == -1) 861 err(1, "cannot get sector size"); 862 863 dlp.d_secperunit = ms / dlp.d_secsize; 864 865 if (bpb->bpbSecPerTrack == 0 && ioctl(fd, DIOCGFWSECTORS, 866 &dlp.d_nsectors) == -1) { 867 warn("cannot get number of sectors per track"); 868 dlp.d_nsectors = 63; 869 } 870 if (bpb->bpbHeads == 0 && 871 ioctl(fd, DIOCGFWHEADS, &dlp.d_ntracks) == -1) { 872 warn("cannot get number of heads"); 873 if (dlp.d_secperunit <= 63*1*1024) 874 dlp.d_ntracks = 1; 875 else if (dlp.d_secperunit <= 63*16*1024) 876 dlp.d_ntracks = 16; 877 else 878 dlp.d_ntracks = 255; 879 } 880 881 hs = (ms / dlp.d_secsize) - dlp.d_secperunit; 882 lp = &dlp; 883 } 884 885 if (bpb->bpbBytesPerSec == 0) { 886 if (ckgeom(fname, lp->d_secsize, "bytes/sector") == -1) 887 return -1; 888 bpb->bpbBytesPerSec = lp->d_secsize; 889 } 890 if (bpb->bpbSecPerTrack == 0) { 891 if (ckgeom(fname, lp->d_nsectors, "sectors/track") == -1) 892 return -1; 893 bpb->bpbSecPerTrack = lp->d_nsectors; 894 } 895 if (bpb->bpbHeads == 0) { 896 if (ckgeom(fname, lp->d_ntracks, "drive heads") == -1) 897 return -1; 898 bpb->bpbHeads = lp->d_ntracks; 899 } 900 if (bpb->bpbHugeSectors == 0) 901 bpb->bpbHugeSectors = lp->d_secperunit; 902 if (bpb->bpbHiddenSecs == 0) 903 bpb->bpbHiddenSecs = hs; 904 return 0; 905 } 906 907 /* 908 * Print out BPB values. 909 */ 910 static void 911 print_bpb(struct bpb *bpb) 912 { 913 printf("BytesPerSec=%u SecPerClust=%u ResSectors=%u FATs=%u", 914 bpb->bpbBytesPerSec, bpb->bpbSecPerClust, bpb->bpbResSectors, 915 bpb->bpbFATs); 916 if (bpb->bpbRootDirEnts) 917 printf(" RootDirEnts=%u", bpb->bpbRootDirEnts); 918 if (bpb->bpbSectors) 919 printf(" Sectors=%u", bpb->bpbSectors); 920 printf(" Media=%#x", bpb->bpbMedia); 921 if (bpb->bpbFATsecs) 922 printf(" FATsecs=%u", bpb->bpbFATsecs); 923 printf(" SecPerTrack=%u Heads=%u HiddenSecs=%u", bpb->bpbSecPerTrack, 924 bpb->bpbHeads, bpb->bpbHiddenSecs); 925 if (bpb->bpbHugeSectors) 926 printf(" HugeSectors=%u", bpb->bpbHugeSectors); 927 if (!bpb->bpbFATsecs) { 928 printf(" FATsecs=%u RootCluster=%u", bpb->bpbBigFATsecs, 929 bpb->bpbRootClust); 930 printf(" FSInfo="); 931 printf(bpb->bpbFSInfo == MAXU16 ? "%#x" : "%u", bpb->bpbFSInfo); 932 printf(" Backup="); 933 printf(bpb->bpbBackup == MAXU16 ? "%#x" : "%u", bpb->bpbBackup); 934 } 935 printf("\n"); 936 } 937 938 /* 939 * Check a disk geometry value. 940 */ 941 static int 942 ckgeom(const char *fname, u_int val, const char *msg) 943 { 944 if (!val) { 945 warnx("%s: no default %s", fname, msg); 946 return -1; 947 } 948 if (val > MAXU16) { 949 warnx("%s: illegal %s %d", fname, msg, val); 950 return -1; 951 } 952 return 0; 953 } 954 955 /* 956 * Check a volume label. 957 */ 958 static int 959 oklabel(const char *src) 960 { 961 int c, i; 962 963 for (i = 0; i <= 11; i++) { 964 c = (u_char)*src++; 965 if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c)) 966 break; 967 } 968 return i && !c; 969 } 970 971 /* 972 * Make a volume label. 973 */ 974 static void 975 mklabel(u_int8_t *dest, const char *src) 976 { 977 int c, i; 978 979 for (i = 0; i < 11; i++) { 980 c = *src ? toupper(*src++) : ' '; 981 *dest++ = !i && c == '\xe5' ? 5 : c; 982 } 983 } 984 985 /* 986 * Copy string, padding with spaces. 987 */ 988 static void 989 setstr(u_int8_t *dest, const char *src, size_t len) 990 { 991 while (len--) 992 *dest++ = *src ? *src++ : ' '; 993 } 994 995 static void 996 infohandler(int sig __unused) 997 { 998 999 got_siginfo = 1; 1000 } 1001