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 #include <sys/param.h>
29 #include <sys/disklabel32.h>
30 #include <sys/diskmbr.h>
31 #include <sys/diskslice.h>
32 #include <sys/mount.h>
33 #include <sys/stat.h>
34 //#include <sys/sysctl.h>
35 #include <sys/time.h>
36
37 #include <machine/ioctl_fd.h>
38
39 #include <assert.h>
40 #include <ctype.h>
41 #include <disktab.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 MINBPS 512 /* minimum bytes per sector */
61 #define MAXBPS 4096 /* maximum 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) = (uint8_t)(x)
85
86 #define mk2(p, x) \
87 (p)[0] = (uint8_t)(x), \
88 (p)[1] = (uint8_t)((x) >> 010)
89
90 #define mk4(p, x) \
91 (p)[0] = (uint8_t)(x), \
92 (p)[1] = (uint8_t)((x) >> 010), \
93 (p)[2] = (uint8_t)((x) >> 020), \
94 (p)[3] = (uint8_t)((x) >> 030)
95
96 struct bs {
97 uint8_t bsJump[3]; /* bootstrap entry point */
98 uint8_t bsOemName[8]; /* OEM name and version */
99 } __packed;
100
101 struct bsbpb {
102 uint8_t bpbBytesPerSec[2]; /* bytes per sector */
103 uint8_t bpbSecPerClust; /* sectors per cluster */
104 uint8_t bpbResSectors[2]; /* reserved sectors */
105 uint8_t bpbFATs; /* number of FATs */
106 uint8_t bpbRootDirEnts[2]; /* root directory entries */
107 uint8_t bpbSectors[2]; /* total sectors */
108 uint8_t bpbMedia; /* media descriptor */
109 uint8_t bpbFATsecs[2]; /* sectors per FAT */
110 uint8_t bpbSecPerTrack[2]; /* sectors per track */
111 uint8_t bpbHeads[2]; /* drive heads */
112 uint8_t bpbHiddenSecs[4]; /* hidden sectors */
113 uint8_t bpbHugeSectors[4]; /* big total sectors */
114 } __packed;
115
116 struct bsxbpb {
117 uint8_t bpbBigFATsecs[4]; /* big sectors per FAT */
118 uint8_t bpbExtFlags[2]; /* FAT control flags */
119 uint8_t bpbFSVers[2]; /* file system version */
120 uint8_t bpbRootClust[4]; /* root directory start cluster */
121 uint8_t bpbFSInfo[2]; /* file system info sector */
122 uint8_t bpbBackup[2]; /* backup boot sector */
123 uint8_t bpbReserved[12]; /* reserved */
124 } __packed;
125
126 struct bsx {
127 uint8_t exDriveNumber; /* drive number */
128 uint8_t exReserved1; /* reserved */
129 uint8_t exBootSignature; /* extended boot signature */
130 uint8_t exVolumeID[4]; /* volume ID number */
131 uint8_t exVolumeLabel[11]; /* volume label */
132 uint8_t exFileSysType[8]; /* file system type */
133 } __packed;
134
135 struct de {
136 uint8_t deName[11]; /* name and extension */
137 uint8_t deAttributes; /* attributes */
138 uint8_t rsvd[10]; /* reserved */
139 uint8_t deMTime[2]; /* last-modified time */
140 uint8_t deMDate[2]; /* last-modified date */
141 uint8_t deStartCluster[2]; /* starting cluster */
142 uint8_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 uint8_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 #ifndef MAKEFS
218 static int check_mounted(const char *, mode_t);
219 #endif
220 static ssize_t getchunksize(void);
221 static int getstdfmt(const char *, struct bpb *);
222 static int getdiskinfo(int, const char *, const char *, int, struct bpb *);
223 static void print_bpb(struct bpb *);
224 static int ckgeom(const char *, u_int, const char *);
225 static void mklabel(uint8_t *, const char *);
226 static int oklabel(const char *);
227 static void setstr(uint8_t *, const char *, size_t);
228
229 int
mkfs_msdos(const char * fname,const char * dtype,const struct msdos_options * op)230 mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
231 {
232 char buf[MAXPATHLEN];
233 struct sigaction si_sa;
234 struct stat sb;
235 struct timeval tv;
236 struct bpb bpb;
237 struct tm *tm;
238 struct bs *bs;
239 struct bsbpb *bsbpb;
240 struct bsxbpb *bsxbpb;
241 struct bsx *bsx;
242 struct de *de;
243 uint8_t *img;
244 uint8_t *physbuf, *physbuf_end;
245 const char *bname;
246 ssize_t n;
247 time_t now;
248 u_int fat, bss, rds, cls, dir, lsn, x, x1, x2;
249 u_int extra_res, alignment, saved_x, attempts=0;
250 bool set_res, set_spf, set_spc;
251 int fd, fd1, rv;
252 struct msdos_options o = *op;
253 ssize_t chunksize;
254
255 physbuf = NULL;
256 rv = -1;
257 fd = fd1 = -1;
258
259 if (o.block_size && o.sectors_per_cluster) {
260 warnx("Cannot specify both block size and sectors per cluster");
261 goto done;
262 }
263 if (o.OEM_string && strlen(o.OEM_string) > 8) {
264 warnx("%s: bad OEM string", o.OEM_string);
265 goto done;
266 }
267 if (o.create_size) {
268 if (o.no_create) {
269 warnx("create (-C) is incompatible with -N");
270 goto done;
271 }
272 fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644);
273 if (fd == -1) {
274 warnx("failed to create %s", fname);
275 goto done;
276 }
277 if (ftruncate(fd, o.create_size)) {
278 warnx("failed to initialize %jd bytes", (intmax_t)o.create_size);
279 goto done;
280 }
281 } else if ((fd = open(fname, o.no_create ? O_RDONLY : O_RDWR)) == -1) {
282 warn("%s", fname);
283 goto done;
284 }
285 if (fstat(fd, &sb)) {
286 warn("%s", fname);
287 goto done;
288 }
289 if (o.create_size) {
290 if (!S_ISREG(sb.st_mode))
291 warnx("warning, %s is not a regular file", fname);
292 } else {
293 #ifdef MAKEFS
294 errx(1, "o.create_size must be set!");
295 #else
296 if (!S_ISCHR(sb.st_mode))
297 warnx("warning, %s is not a character device", fname);
298 #endif
299 }
300 #ifndef MAKEFS
301 if (!o.no_create)
302 if (check_mounted(fname, sb.st_mode) == -1)
303 goto done;
304 #endif
305 if (o.offset && o.offset != lseek(fd, o.offset, SEEK_SET)) {
306 warnx("cannot seek to %jd", (intmax_t)o.offset);
307 goto done;
308 }
309 memset(&bpb, 0, sizeof(bpb));
310 if (o.floppy) {
311 if (getstdfmt(o.floppy, &bpb) == -1)
312 goto done;
313 bpb.bpbHugeSectors = bpb.bpbSectors;
314 bpb.bpbSectors = 0;
315 bpb.bpbBigFATsecs = bpb.bpbFATsecs;
316 bpb.bpbFATsecs = 0;
317 }
318 if (o.drive_heads)
319 bpb.bpbHeads = o.drive_heads;
320 if (o.sectors_per_track)
321 bpb.bpbSecPerTrack = o.sectors_per_track;
322 if (o.bytes_per_sector)
323 bpb.bpbBytesPerSec = o.bytes_per_sector;
324 if (o.size)
325 bpb.bpbHugeSectors = o.size;
326 if (o.hidden_sectors_set)
327 bpb.bpbHiddenSecs = o.hidden_sectors;
328 if (!(o.floppy || (o.drive_heads && o.sectors_per_track &&
329 o.bytes_per_sector && o.size && o.hidden_sectors_set))) {
330 if (getdiskinfo(fd, fname, dtype, o.hidden_sectors_set, &bpb) == -1)
331 goto done;
332 bpb.bpbHugeSectors -= (o.offset / bpb.bpbBytesPerSec);
333 if (bpb.bpbSecPerClust == 0) { /* set defaults */
334 if (bpb.bpbHugeSectors <= 6000) /* about 3MB -> 512 bytes */
335 bpb.bpbSecPerClust = 1;
336 else if (bpb.bpbHugeSectors <= (1<<17)) /* 64M -> 4k */
337 bpb.bpbSecPerClust = 8;
338 else if (bpb.bpbHugeSectors <= (1<<19)) /* 256M -> 8k */
339 bpb.bpbSecPerClust = 16;
340 else if (bpb.bpbHugeSectors <= (1<<21)) /* 1G -> 16k */
341 bpb.bpbSecPerClust = 32;
342 else
343 bpb.bpbSecPerClust = 64; /* otherwise 32k */
344 }
345 }
346 if (bpb.bpbBytesPerSec < MINBPS ||
347 bpb.bpbBytesPerSec > MAXBPS ||
348 !powerof2(bpb.bpbBytesPerSec)) {
349 warnx("Invalid bytes/sector (%u): must be 512, 1024, 2048 or 4096",
350 bpb.bpbBytesPerSec);
351 goto done;
352 }
353
354 if (o.volume_label && !oklabel(o.volume_label)) {
355 warnx("%s: bad volume label", o.volume_label);
356 goto done;
357 }
358 if (!(fat = o.fat_type)) {
359 if (o.floppy)
360 fat = 12;
361 else if (!o.directory_entries && (o.info_sector || o.backup_sector))
362 fat = 32;
363 }
364 if ((fat == 32 && o.directory_entries) ||
365 (fat != 32 && (o.info_sector || o.backup_sector))) {
366 warnx("-%c is not a legal FAT%s option",
367 fat == 32 ? 'e' : o.info_sector ? 'i' : 'k',
368 fat == 32 ? "32" : "12/16");
369 goto done;
370 }
371 if (o.floppy && fat == 32)
372 bpb.bpbRootDirEnts = 0;
373 if (fat != 0 && fat != 12 && fat != 16 && fat != 32) {
374 warnx("%d: bad FAT type", fat);
375 goto done;
376 }
377
378 if (o.block_size) {
379 if (!powerof2(o.block_size)) {
380 warnx("block size (%u) is not a power of 2", o.block_size);
381 goto done;
382 }
383 if (o.block_size < bpb.bpbBytesPerSec) {
384 warnx("block size (%u) is too small; minimum is %u",
385 o.block_size, bpb.bpbBytesPerSec);
386 goto done;
387 }
388 if (o.block_size > bpb.bpbBytesPerSec * MAXSPC) {
389 warnx("block size (%u) is too large; maximum is %u",
390 o.block_size, bpb.bpbBytesPerSec * MAXSPC);
391 goto done;
392 }
393 bpb.bpbSecPerClust = o.block_size / bpb.bpbBytesPerSec;
394 }
395 if (o.sectors_per_cluster) {
396 if (!powerof2(o.sectors_per_cluster)) {
397 warnx("sectors/cluster (%u) is not a power of 2",
398 o.sectors_per_cluster);
399 goto done;
400 }
401 bpb.bpbSecPerClust = o.sectors_per_cluster;
402 }
403 if (o.reserved_sectors)
404 bpb.bpbResSectors = o.reserved_sectors;
405 if (o.num_FAT) {
406 if (o.num_FAT > MAXNFT) {
407 warnx("number of FATs (%u) is too large; maximum is %u",
408 o.num_FAT, MAXNFT);
409 goto done;
410 }
411 bpb.bpbFATs = o.num_FAT;
412 }
413 if (o.directory_entries)
414 bpb.bpbRootDirEnts = o.directory_entries;
415 if (o.media_descriptor_set) {
416 if (o.media_descriptor < 0xf0) {
417 warnx("illegal media descriptor (%#x)", o.media_descriptor);
418 goto done;
419 }
420 bpb.bpbMedia = o.media_descriptor;
421 }
422 if (o.sectors_per_fat)
423 bpb.bpbBigFATsecs = o.sectors_per_fat;
424 if (o.info_sector)
425 bpb.bpbFSInfo = o.info_sector;
426 if (o.backup_sector)
427 bpb.bpbBackup = o.backup_sector;
428 bss = 1;
429 bname = NULL;
430 fd1 = -1;
431 if (o.bootstrap) {
432 bname = o.bootstrap;
433 if (!strchr(bname, '/')) {
434 snprintf(buf, sizeof(buf), "/boot/%s", bname);
435 bname = buf;
436 }
437 if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb)) {
438 warn("%s", bname);
439 goto done;
440 }
441 if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bpbBytesPerSec ||
442 sb.st_size < bpb.bpbBytesPerSec ||
443 sb.st_size > bpb.bpbBytesPerSec * MAXU16) {
444 warnx("%s: inappropriate file type or format", bname);
445 goto done;
446 }
447 bss = sb.st_size / bpb.bpbBytesPerSec;
448 }
449 if (!bpb.bpbFATs)
450 bpb.bpbFATs = 2;
451 if (!fat) {
452 if (bpb.bpbHugeSectors < (bpb.bpbResSectors ? bpb.bpbResSectors : bss) +
453 howmany((RESFTE + (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1)) *
454 (bpb.bpbSecPerClust ? 16 : 12) / BPN,
455 bpb.bpbBytesPerSec * NPB) *
456 bpb.bpbFATs +
457 howmany(bpb.bpbRootDirEnts ? bpb.bpbRootDirEnts : DEFRDE,
458 bpb.bpbBytesPerSec / sizeof(struct de)) +
459 (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1) *
460 (bpb.bpbSecPerClust ? bpb.bpbSecPerClust :
461 howmany(DEFBLK, bpb.bpbBytesPerSec)))
462 fat = 12;
463 else if (bpb.bpbRootDirEnts || bpb.bpbHugeSectors <
464 (bpb.bpbResSectors ? bpb.bpbResSectors : bss) +
465 howmany((RESFTE + MAXCLS16) * 2, bpb.bpbBytesPerSec) *
466 bpb.bpbFATs +
467 howmany(DEFRDE, bpb.bpbBytesPerSec / sizeof(struct de)) +
468 (MAXCLS16 + 1) *
469 (bpb.bpbSecPerClust ? bpb.bpbSecPerClust :
470 howmany(8192, bpb.bpbBytesPerSec)))
471 fat = 16;
472 else
473 fat = 32;
474 }
475 x = bss;
476 if (fat == 32) {
477 if (!bpb.bpbFSInfo) {
478 if (x == MAXU16 || x == bpb.bpbBackup) {
479 warnx("no room for info sector");
480 goto done;
481 }
482 bpb.bpbFSInfo = x;
483 }
484 if (bpb.bpbFSInfo != MAXU16 && x <= bpb.bpbFSInfo)
485 x = bpb.bpbFSInfo + 1;
486 if (!bpb.bpbBackup) {
487 if (x == MAXU16) {
488 warnx("no room for backup sector");
489 goto done;
490 }
491 bpb.bpbBackup = x;
492 } else if (bpb.bpbBackup != MAXU16 && bpb.bpbBackup == bpb.bpbFSInfo) {
493 warnx("backup sector would overwrite info sector");
494 goto done;
495 }
496 if (bpb.bpbBackup != MAXU16 && x <= bpb.bpbBackup)
497 x = bpb.bpbBackup + 1;
498 }
499
500 extra_res = 0;
501 alignment = 0;
502 set_res = (bpb.bpbResSectors == 0);
503 set_spf = (bpb.bpbBigFATsecs == 0);
504 set_spc = (bpb.bpbSecPerClust == 0);
505 saved_x = x;
506
507 /*
508 * Attempt to align the root directory to cluster if o.align is set.
509 * This is done by padding with reserved blocks. Note that this can
510 * cause other factors to change, which can in turn change the alignment.
511 * This should take at most 2 iterations, as increasing the reserved
512 * amount may cause the FAT size to decrease by 1, requiring another
513 * bpbFATs reserved blocks. If bpbSecPerClust changes, it will
514 * be half of its previous size, and thus will not throw off alignment.
515 */
516 do {
517 x = saved_x;
518 if (set_res)
519 bpb.bpbResSectors = ((fat == 32) ?
520 MAX(x, MAX(16384 / bpb.bpbBytesPerSec, 4)) : x) + extra_res;
521 else if (bpb.bpbResSectors < x) {
522 warnx("too few reserved sectors (need %d have %d)", x,
523 bpb.bpbResSectors);
524 goto done;
525 }
526 if (fat != 32 && !bpb.bpbRootDirEnts)
527 bpb.bpbRootDirEnts = DEFRDE;
528 rds = howmany(bpb.bpbRootDirEnts,
529 bpb.bpbBytesPerSec / sizeof(struct de));
530 if (set_spc) {
531 for (bpb.bpbSecPerClust = howmany(fat == 16 ? DEFBLK16 :
532 DEFBLK, bpb.bpbBytesPerSec);
533 bpb.bpbSecPerClust < MAXSPC && (bpb.bpbResSectors +
534 howmany((RESFTE + maxcls(fat)) * (fat / BPN),
535 bpb.bpbBytesPerSec * NPB) * bpb.bpbFATs +
536 rds +
537 (u_int64_t) (maxcls(fat) + 1) * bpb.bpbSecPerClust) <=
538 bpb.bpbHugeSectors;
539 bpb.bpbSecPerClust <<= 1)
540 continue;
541
542 }
543 if (fat != 32 && bpb.bpbBigFATsecs > MAXU16) {
544 warnx("too many sectors/FAT for FAT12/16");
545 goto done;
546 }
547 x1 = bpb.bpbResSectors + rds;
548 x = bpb.bpbBigFATsecs ? bpb.bpbBigFATsecs : 1;
549 if (x1 + (u_int64_t)x * bpb.bpbFATs > bpb.bpbHugeSectors) {
550 warnx("meta data exceeds file system size");
551 goto done;
552 }
553 x1 += x * bpb.bpbFATs;
554 x = (u_int64_t)(bpb.bpbHugeSectors - x1) * bpb.bpbBytesPerSec * NPB /
555 (bpb.bpbSecPerClust * bpb.bpbBytesPerSec * NPB +
556 fat / BPN * bpb.bpbFATs);
557 x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN),
558 bpb.bpbBytesPerSec * NPB);
559 if (set_spf) {
560 if (bpb.bpbBigFATsecs == 0)
561 bpb.bpbBigFATsecs = x2;
562 x1 += (bpb.bpbBigFATsecs - 1) * bpb.bpbFATs;
563 }
564 if (set_res) {
565 /* attempt to align root directory */
566 alignment = (bpb.bpbResSectors + bpb.bpbBigFATsecs * bpb.bpbFATs) %
567 bpb.bpbSecPerClust;
568 if (o.align)
569 extra_res += bpb.bpbSecPerClust - alignment;
570 }
571 attempts++;
572 } while (o.align && alignment != 0 && attempts < 2);
573 if (o.align && alignment != 0)
574 warnx("warning: Alignment failed.");
575
576 cls = (bpb.bpbHugeSectors - x1) / bpb.bpbSecPerClust;
577 x = (uint64_t)bpb.bpbBigFATsecs * bpb.bpbBytesPerSec * NPB / (fat / BPN) -
578 RESFTE;
579 if (cls > x)
580 cls = x;
581 if (bpb.bpbBigFATsecs < x2)
582 warnx("warning: sectors/FAT limits file system to %u clusters",
583 cls);
584 if (cls < mincls(fat)) {
585 warnx("%u clusters too few clusters for FAT%u, need %u", cls, fat,
586 mincls(fat));
587 goto done;
588 }
589 if (cls > maxcls(fat)) {
590 cls = maxcls(fat);
591 bpb.bpbHugeSectors = x1 + (cls + 1) * bpb.bpbSecPerClust - 1;
592 warnx("warning: FAT type limits file system to %u sectors",
593 bpb.bpbHugeSectors);
594 }
595 printf("%s: %u sector%s in %u FAT%u cluster%s "
596 "(%u bytes/cluster)\n", fname, cls * bpb.bpbSecPerClust,
597 cls * bpb.bpbSecPerClust == 1 ? "" : "s", cls, fat,
598 cls == 1 ? "" : "s", bpb.bpbBytesPerSec * bpb.bpbSecPerClust);
599 if (!bpb.bpbMedia)
600 bpb.bpbMedia = !bpb.bpbHiddenSecs ? 0xf0 : 0xf8;
601 if (fat == 32)
602 bpb.bpbRootClust = RESFTE;
603 if (bpb.bpbHugeSectors <= MAXU16) {
604 bpb.bpbSectors = bpb.bpbHugeSectors;
605 bpb.bpbHugeSectors = 0;
606 }
607 if (fat != 32) {
608 bpb.bpbFATsecs = bpb.bpbBigFATsecs;
609 bpb.bpbBigFATsecs = 0;
610 }
611 print_bpb(&bpb);
612 if (!o.no_create) {
613 if (o.timestamp_set) {
614 tv.tv_sec = now = o.timestamp;
615 tv.tv_usec = 0;
616 tm = gmtime(&now);
617 } else {
618 gettimeofday(&tv, NULL);
619 now = tv.tv_sec;
620 tm = localtime(&now);
621 }
622
623 chunksize = getchunksize();
624 physbuf = malloc(chunksize);
625 if (physbuf == NULL) {
626 warn(NULL);
627 goto done;
628 }
629 physbuf_end = physbuf + chunksize;
630 img = physbuf;
631
632 dir = bpb.bpbResSectors + (bpb.bpbFATsecs ? bpb.bpbFATsecs :
633 bpb.bpbBigFATsecs) * bpb.bpbFATs;
634 memset(&si_sa, 0, sizeof(si_sa));
635 si_sa.sa_handler = infohandler;
636 if (sigaction(SIGINFO, &si_sa, NULL) == -1) {
637 warn("sigaction SIGINFO");
638 goto done;
639 }
640 for (lsn = 0; lsn < dir + (fat == 32 ? bpb.bpbSecPerClust : rds); lsn++) {
641 if (got_siginfo) {
642 fprintf(stderr,"%s: writing sector %u of %u (%u%%)\n",
643 fname, lsn,
644 (dir + (fat == 32 ? bpb.bpbSecPerClust: rds)),
645 (lsn * 100) / (dir +
646 (fat == 32 ? bpb.bpbSecPerClust: rds)));
647 got_siginfo = 0;
648 }
649 x = lsn;
650 if (o.bootstrap &&
651 fat == 32 && bpb.bpbBackup != MAXU16 &&
652 bss <= bpb.bpbBackup && x >= bpb.bpbBackup) {
653 x -= bpb.bpbBackup;
654 if (!x && lseek(fd1, o.offset, SEEK_SET)) {
655 warn("%s", bname);
656 goto done;
657 }
658 }
659 if (o.bootstrap && x < bss) {
660 if ((n = read(fd1, img, bpb.bpbBytesPerSec)) == -1) {
661 warn("%s", bname);
662 goto done;
663 }
664 if ((unsigned)n != bpb.bpbBytesPerSec) {
665 warnx("%s: can't read sector %u", bname, x);
666 goto done;
667 }
668 } else
669 memset(img, 0, bpb.bpbBytesPerSec);
670 if (!lsn ||
671 (fat == 32 && bpb.bpbBackup != MAXU16 &&
672 lsn == bpb.bpbBackup)) {
673 x1 = sizeof(struct bs);
674 bsbpb = (struct bsbpb *)(img + x1);
675 mk2(bsbpb->bpbBytesPerSec, bpb.bpbBytesPerSec);
676 mk1(bsbpb->bpbSecPerClust, bpb.bpbSecPerClust);
677 mk2(bsbpb->bpbResSectors, bpb.bpbResSectors);
678 mk1(bsbpb->bpbFATs, bpb.bpbFATs);
679 mk2(bsbpb->bpbRootDirEnts, bpb.bpbRootDirEnts);
680 mk2(bsbpb->bpbSectors, bpb.bpbSectors);
681 mk1(bsbpb->bpbMedia, bpb.bpbMedia);
682 mk2(bsbpb->bpbFATsecs, bpb.bpbFATsecs);
683 mk2(bsbpb->bpbSecPerTrack, bpb.bpbSecPerTrack);
684 mk2(bsbpb->bpbHeads, bpb.bpbHeads);
685 mk4(bsbpb->bpbHiddenSecs, bpb.bpbHiddenSecs);
686 mk4(bsbpb->bpbHugeSectors, bpb.bpbHugeSectors);
687 x1 += sizeof(struct bsbpb);
688 if (fat == 32) {
689 bsxbpb = (struct bsxbpb *)(img + x1);
690 mk4(bsxbpb->bpbBigFATsecs, bpb.bpbBigFATsecs);
691 mk2(bsxbpb->bpbExtFlags, 0);
692 mk2(bsxbpb->bpbFSVers, 0);
693 mk4(bsxbpb->bpbRootClust, bpb.bpbRootClust);
694 mk2(bsxbpb->bpbFSInfo, bpb.bpbFSInfo);
695 mk2(bsxbpb->bpbBackup, bpb.bpbBackup);
696 x1 += sizeof(struct bsxbpb);
697 }
698 bsx = (struct bsx *)(img + x1);
699 mk1(bsx->exBootSignature, 0x29);
700 if (o.volume_id_set)
701 x = o.volume_id;
702 else
703 x = (((u_int)(1 + tm->tm_mon) << 8 |
704 (u_int)tm->tm_mday) +
705 ((u_int)tm->tm_sec << 8 |
706 (u_int)(tv.tv_usec / 10))) << 16 |
707 ((u_int)(1900 + tm->tm_year) +
708 ((u_int)tm->tm_hour << 8 |
709 (u_int)tm->tm_min));
710 mk4(bsx->exVolumeID, x);
711 mklabel(bsx->exVolumeLabel, o.volume_label ? o.volume_label : "NO NAME");
712 snprintf(buf, sizeof(buf), "FAT%u", fat);
713 setstr(bsx->exFileSysType, buf, sizeof(bsx->exFileSysType));
714 if (!o.bootstrap) {
715 x1 += sizeof(struct bsx);
716 bs = (struct bs *)img;
717 mk1(bs->bsJump[0], 0xeb);
718 mk1(bs->bsJump[1], x1 - 2);
719 mk1(bs->bsJump[2], 0x90);
720 setstr(bs->bsOemName, o.OEM_string ? o.OEM_string : "BSD4.4 ",
721 sizeof(bs->bsOemName));
722 memcpy(img + x1, bootcode, sizeof(bootcode));
723 mk2(img + MINBPS - 2, DOSMAGIC);
724 }
725 } else if (fat == 32 && bpb.bpbFSInfo != MAXU16 &&
726 (lsn == bpb.bpbFSInfo ||
727 (bpb.bpbBackup != MAXU16 &&
728 lsn == bpb.bpbBackup + bpb.bpbFSInfo))) {
729 mk4(img, 0x41615252);
730 mk4(img + MINBPS - 28, 0x61417272);
731 mk4(img + MINBPS - 24, 0xffffffff);
732 mk4(img + MINBPS - 20, 0xffffffff);
733 mk2(img + MINBPS - 2, DOSMAGIC);
734 } else if (lsn >= bpb.bpbResSectors && lsn < dir &&
735 !((lsn - bpb.bpbResSectors) %
736 (bpb.bpbFATsecs ? bpb.bpbFATsecs :
737 bpb.bpbBigFATsecs))) {
738 mk1(img[0], bpb.bpbMedia);
739 for (x = 1; x < fat * (fat == 32 ? 3 : 2) / 8; x++)
740 mk1(img[x], fat == 32 && x % 4 == 3 ? 0x0f : 0xff);
741 } else if (lsn == dir && o.volume_label) {
742 de = (struct de *)img;
743 mklabel(de->deName, o.volume_label);
744 mk1(de->deAttributes, 050);
745 x = (u_int)tm->tm_hour << 11 |
746 (u_int)tm->tm_min << 5 |
747 (u_int)tm->tm_sec >> 1;
748 mk2(de->deMTime, x);
749 x = (u_int)(tm->tm_year - 80) << 9 |
750 (u_int)(tm->tm_mon + 1) << 5 |
751 (u_int)tm->tm_mday;
752 mk2(de->deMDate, x);
753 }
754 /*
755 * Issue a write of chunksize once we have collected
756 * enough sectors.
757 */
758 img += bpb.bpbBytesPerSec;
759 if (img >= physbuf_end) {
760 n = write(fd, physbuf, chunksize);
761 if (n != chunksize) {
762 warnx("%s: can't write sector %u", fname, lsn);
763 goto done;
764 }
765 img = physbuf;
766 }
767 }
768 /*
769 * Write remaining sectors, if the last write didn't end
770 * up filling a whole chunk.
771 */
772 if (img != physbuf) {
773 ssize_t tailsize = img - physbuf;
774
775 n = write(fd, physbuf, tailsize);
776 if (n != tailsize) {
777 warnx("%s: can't write sector %u", fname, lsn);
778 goto done;
779 }
780 }
781 }
782 rv = 0;
783 done:
784 free(physbuf);
785 if (fd != -1)
786 close(fd);
787 if (fd1 != -1)
788 close(fd1);
789
790 return rv;
791 }
792
793 /*
794 * return -1 with error if file system is mounted.
795 */
796 #ifndef MAKEFS
797 static int
check_mounted(const char * fname,mode_t mode)798 check_mounted(const char *fname, mode_t mode)
799 {
800 /*
801 * If getmntinfo() is not available (e.g. Linux) don't check. This should
802 * not be a problem since we will only be using makefs to create images.
803 */
804 struct statfs *mp;
805 const char *s1, *s2;
806 size_t len;
807 int n, r;
808
809 if (!(n = getmntinfo(&mp, MNT_NOWAIT))) {
810 warn("getmntinfo");
811 return -1;
812 }
813 len = strlen(_PATH_DEV);
814 s1 = fname;
815 if (!strncmp(s1, _PATH_DEV, len))
816 s1 += len;
817 r = S_ISCHR(mode) && s1 != fname && *s1 == 'r';
818 for (; n--; mp++) {
819 s2 = mp->f_mntfromname;
820 if (!strncmp(s2, _PATH_DEV, len))
821 s2 += len;
822 if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) ||
823 !strcmp(s1, s2)) {
824 warnx("%s is mounted on %s", fname, mp->f_mntonname);
825 return -1;
826 }
827 }
828 return 0;
829 }
830 #endif
831
832 /*
833 * Get optimal I/O size
834 */
835 static ssize_t
getchunksize(void)836 getchunksize(void)
837 {
838 static ssize_t chunksize;
839
840 if (chunksize != 0)
841 return (chunksize);
842
843 #if 0
844 int mib[2];
845 size_t len;
846
847 mib[0] = CTL_KERN;
848 mib[1] = KERN_MAXPHYS;
849 len = sizeof(chunksize);
850
851 if (sysctl(mib, 2, &chunksize, &len, NULL, 0) == -1) {
852 warn("sysctl: KERN_MAXPHYS, using %zu", (size_t)MAXPHYS);
853 chunksize = 0;
854 }
855 #endif
856 if (chunksize == 0)
857 chunksize = MAXPHYS;
858
859 /*
860 * For better performance, we want to write larger chunks instead of
861 * individual sectors (the size can only be 512, 1024, 2048 or 4096
862 * bytes). Assert that chunksize can always hold an integer number of
863 * sectors by asserting that both are power of two numbers and the
864 * chunksize is greater than MAXBPS.
865 */
866 static_assert(powerof2(MAXBPS), "MAXBPS is not power of 2");
867 assert(powerof2(chunksize));
868 assert(chunksize > MAXBPS);
869
870 return (chunksize);
871 }
872
873 /*
874 * Get a standard format.
875 */
876 static int
getstdfmt(const char * fmt,struct bpb * bpb)877 getstdfmt(const char *fmt, struct bpb *bpb)
878 {
879 u_int x, i;
880
881 x = NELEM(stdfmt);
882 for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++);
883 if (i == x) {
884 warnx("%s: unknown standard format", fmt);
885 return -1;
886 }
887 *bpb = stdfmt[i].bpb;
888 return 0;
889 }
890
891 static void
compute_geometry_from_file(int fd,const char * fname,struct disklabel32 * lp)892 compute_geometry_from_file(int fd, const char *fname, struct disklabel32 *lp)
893 {
894 struct stat st;
895 off_t ms;
896
897 if (fstat(fd, &st))
898 err(1, "cannot get disk size");
899 if (!S_ISREG(st.st_mode))
900 errx(1, "%s is not a regular file", fname);
901 ms = st.st_size;
902 lp->d_secsize = 512;
903 lp->d_nsectors = 63;
904 lp->d_ntracks = 255;
905 lp->d_secperunit = ms / lp->d_secsize;
906 }
907
908 /*
909 * Get disk slice, partition, and geometry information.
910 */
911 static int
getdiskinfo(int fd,const char * fname,const char * dtype,__unused int oflag,struct bpb * bpb)912 getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag,
913 struct bpb *bpb)
914 {
915 struct disklabel32 *lp, dlp;
916 off_t hs = 0;
917 #ifndef MAKEFS
918 off_t ms;
919 struct fd_type type;
920 struct partinfo pi;
921
922 lp = NULL;
923
924 /* If the user specified a disk type, try to use that */
925 if (dtype != NULL) {
926 lp = getdiskbyname(dtype);
927 }
928
929 /* Maybe it's a floppy drive */
930 if (lp == NULL) {
931 if (ioctl(fd, DIOCGPART, &pi) == -1) {
932 /* create a fake geometry for a file image */
933 compute_geometry_from_file(fd, fname, &dlp);
934 lp = &dlp;
935 } else if (ioctl(fd, FD_GTYPE, &type) != -1) {
936 ms = pi.media_size;
937 dlp.d_secsize = 128 << type.secsize;
938 dlp.d_nsectors = type.sectrac;
939 dlp.d_ntracks = type.heads;
940 dlp.d_secperunit = ms / dlp.d_secsize;
941 lp = &dlp;
942 } else {
943 ms = pi.media_size;
944 }
945 }
946
947 /* Maybe it's a fixed drive */
948 if (lp == NULL) {
949 if (ioctl(fd, DIOCGPART, &pi) == - 1)
950 err(1, "cannot get disk information");
951 dlp.d_secsize = pi.media_blksize;
952 dlp.d_nsectors = pi.d_secpertrack;
953 dlp.d_ntracks = pi.d_nheads;
954 if (bpb->bpbBytesPerSec)
955 dlp.d_secsize = bpb->bpbBytesPerSec;
956
957 dlp.d_secperunit = ms / dlp.d_secsize;
958
959 hs = (ms / dlp.d_secsize) - dlp.d_secperunit;
960 lp = &dlp;
961 }
962 #else
963 (void)dtype;
964 /* In the makefs case we only support image files: */
965 compute_geometry_from_file(fd, fname, &dlp);
966 lp = &dlp;
967 #endif
968
969 if (bpb->bpbBytesPerSec == 0) {
970 if (ckgeom(fname, lp->d_secsize, "bytes/sector") == -1)
971 return -1;
972 bpb->bpbBytesPerSec = lp->d_secsize;
973 }
974 if (bpb->bpbSecPerTrack == 0) {
975 if (ckgeom(fname, lp->d_nsectors, "sectors/track") == -1)
976 return -1;
977 bpb->bpbSecPerTrack = lp->d_nsectors;
978 }
979 if (bpb->bpbHeads == 0) {
980 if (ckgeom(fname, lp->d_ntracks, "drive heads") == -1)
981 return -1;
982 bpb->bpbHeads = lp->d_ntracks;
983 }
984 if (bpb->bpbHugeSectors == 0)
985 bpb->bpbHugeSectors = lp->d_secperunit;
986 if (bpb->bpbHiddenSecs == 0)
987 bpb->bpbHiddenSecs = hs;
988 return 0;
989 }
990
991 /*
992 * Print out BPB values.
993 */
994 static void
print_bpb(struct bpb * bpb)995 print_bpb(struct bpb *bpb)
996 {
997 printf("BytesPerSec=%u SecPerClust=%u ResSectors=%u FATs=%u",
998 bpb->bpbBytesPerSec, bpb->bpbSecPerClust, bpb->bpbResSectors,
999 bpb->bpbFATs);
1000 if (bpb->bpbRootDirEnts)
1001 printf(" RootDirEnts=%u", bpb->bpbRootDirEnts);
1002 if (bpb->bpbSectors)
1003 printf(" Sectors=%u", bpb->bpbSectors);
1004 printf(" Media=%#x", bpb->bpbMedia);
1005 if (bpb->bpbFATsecs)
1006 printf(" FATsecs=%u", bpb->bpbFATsecs);
1007 printf(" SecPerTrack=%u Heads=%u HiddenSecs=%u", bpb->bpbSecPerTrack,
1008 bpb->bpbHeads, bpb->bpbHiddenSecs);
1009 if (bpb->bpbHugeSectors)
1010 printf(" HugeSectors=%u", bpb->bpbHugeSectors);
1011 if (!bpb->bpbFATsecs) {
1012 printf(" FATsecs=%u RootCluster=%u", bpb->bpbBigFATsecs,
1013 bpb->bpbRootClust);
1014 printf(" FSInfo=");
1015 printf(bpb->bpbFSInfo == MAXU16 ? "%#x" : "%u", bpb->bpbFSInfo);
1016 printf(" Backup=");
1017 printf(bpb->bpbBackup == MAXU16 ? "%#x" : "%u", bpb->bpbBackup);
1018 }
1019 printf("\n");
1020 }
1021
1022 /*
1023 * Check a disk geometry value.
1024 */
1025 static int
ckgeom(const char * fname,u_int val,const char * msg)1026 ckgeom(const char *fname, u_int val, const char *msg)
1027 {
1028 if (!val) {
1029 warnx("%s: no default %s", fname, msg);
1030 return -1;
1031 }
1032 if (val > MAXU16) {
1033 warnx("%s: illegal %s %d", fname, msg, val);
1034 return -1;
1035 }
1036 return 0;
1037 }
1038
1039 /*
1040 * Check a volume label.
1041 */
1042 static int
oklabel(const char * src)1043 oklabel(const char *src)
1044 {
1045 int c, i;
1046
1047 for (i = 0; i <= 11; i++) {
1048 c = (u_char)*src++;
1049 if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c))
1050 break;
1051 }
1052 return i && !c;
1053 }
1054
1055 /*
1056 * Make a volume label.
1057 */
1058 static void
mklabel(uint8_t * dest,const char * src)1059 mklabel(uint8_t *dest, const char *src)
1060 {
1061 int c, i;
1062
1063 for (i = 0; i < 11; i++) {
1064 c = *src ? toupper(*src++) : ' ';
1065 *dest++ = !i && c == '\xe5' ? 5 : c;
1066 }
1067 }
1068
1069 /*
1070 * Copy string, padding with spaces.
1071 */
1072 static void
setstr(uint8_t * dest,const char * src,size_t len)1073 setstr(uint8_t *dest, const char *src, size_t len)
1074 {
1075 while (len--)
1076 *dest++ = *src ? *src++ : ' ';
1077 }
1078
1079 static void
infohandler(int sig __unused)1080 infohandler(int sig __unused)
1081 {
1082
1083 got_siginfo = 1;
1084 }
1085