1 /*
2 * Mach Operating System
3 * Copyright (c) 1992 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or [email protected]
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/disk.h>
31 #include <sys/disklabel.h>
32 #include <sys/diskmbr.h>
33 #include <sys/endian.h>
34 #include <sys/param.h>
35 #include <sys/stat.h>
36 #include <sys/mount.h>
37 #include <ctype.h>
38 #include <fcntl.h>
39 #include <err.h>
40 #include <errno.h>
41 #include <libgeom.h>
42 #include <paths.h>
43 #include <regex.h>
44 #include <stdint.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49
50 #include "fdisk_mbr_enc.h"
51
52 static int iotest;
53
54 #define NO_DISK_SECTORS ((u_int32_t)-1)
55 #define NO_TRACK_CYLINDERS 1023
56 #define NO_TRACK_HEADS 255
57 #define NO_TRACK_SECTORS 63
58 #define LBUF 100
59 static char lbuf[LBUF];
60
61 /*
62 *
63 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
64 *
65 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
66 * Copyright (c) 1989 Robert. V. Baron
67 * Created.
68 */
69
70 #define Decimal(str, ans, tmp, maxval) if (decimal(str, &tmp, ans, maxval)) ans = tmp
71
72 #define MAX_SEC_SIZE 65536 /* maximum sector size that is supported */
73 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
74 static int secsize = 0; /* the sensed sector size */
75
76 static char *disk;
77
78 static int cyls, sectors, heads, cylsecs;
79 static u_int32_t disksecs;
80
81 struct mboot {
82 unsigned char *bootinst; /* boot code */
83 off_t bootinst_size;
84 struct dos_partition parts[NDOSPART];
85 };
86
87 static struct mboot mboot;
88 static int fd;
89
90 #define ACTIVE 0x80
91
92 static uint dos_cyls;
93 static uint dos_heads;
94 static uint dos_sectors;
95 static uint dos_cylsecs;
96
97 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
98 #define DOSCYL(c) (c & 0xff)
99
100 #define MAX_ARGS 10
101
102 static int current_line_number;
103
104 static int geom_processed = 0;
105 static int part_processed = 0;
106 static int active_processed = 0;
107
108 typedef struct cmd {
109 char cmd;
110 int n_args;
111 struct arg {
112 char argtype;
113 unsigned long arg_val;
114 char * arg_str;
115 } args[MAX_ARGS];
116 } CMD;
117
118 static int B_flag = 0; /* replace boot code */
119 static int I_flag = 0; /* use entire disk for FreeBSD */
120 static int a_flag = 0; /* set active partition */
121 static char *b_flag = NULL; /* path to boot code */
122 static int i_flag = 0; /* replace partition data */
123 static int q_flag = 0; /* Be quiet */
124 static int u_flag = 0; /* update partition data */
125 static int s_flag = 0; /* Print a summary and exit */
126 static int t_flag = 0; /* test only */
127 static char *f_flag = NULL; /* Read config info from file */
128 static int v_flag = 0; /* Be verbose */
129 static int print_config_flag = 0;
130
131 /*
132 * A list of partition types, probably outdated.
133 */
134 static const char *const part_types[256] = {
135 [0x00] = "unused",
136 [0x01] = "Primary DOS with 12 bit FAT",
137 [0x02] = "XENIX / file system",
138 [0x03] = "XENIX /usr file system",
139 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)",
140 [0x05] = "Extended DOS",
141 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)",
142 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX",
143 [0x08] = "AIX file system or SplitDrive",
144 [0x09] = "AIX boot partition or Coherent",
145 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap",
146 [0x0B] = "DOS or Windows 95 with 32 bit FAT",
147 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)",
148 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)",
149 [0x0F] = "Extended DOS (LBA)",
150 [0x10] = "OPUS",
151 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT",
152 [0x12] = "Compaq diagnostics",
153 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)",
154 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)",
155 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)",
156 [0x18] = "AST Windows swapfile",
157 [0x1b] = "ASUS Recovery partition (NTFS)",
158 [0x24] = "NEC DOS",
159 [0x3C] = "PartitionMagic recovery",
160 [0x39] = "plan9",
161 [0x40] = "VENIX 286",
162 [0x41] = "Linux/MINIX (sharing disk with DRDOS)",
163 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)",
164 [0x43] = "Linux native (sharing disk with DRDOS)",
165 [0x4D] = "QNX 4.2 Primary",
166 [0x4E] = "QNX 4.2 Secondary",
167 [0x4F] = "QNX 4.2 Tertiary",
168 [0x50] = "DM (disk manager)",
169 [0x51] = "DM6 Aux1 (or Novell)",
170 [0x52] = "CP/M or Microport SysV/AT",
171 [0x53] = "DM6 Aux3",
172 [0x54] = "DM6",
173 [0x55] = "EZ-Drive (disk manager)",
174 [0x56] = "Golden Bow (disk manager)",
175 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */
176 [0x61] = "SpeedStor",
177 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach",
178 [0x64] = "Novell Netware/286 2.xx",
179 [0x65] = "Novell Netware/386 3.xx",
180 [0x6C] = "DragonFlyBSD",
181 [0x70] = "DiskSecure Multi-Boot",
182 [0x75] = "PCIX",
183 [0x77] = "QNX4.x",
184 [0x78] = "QNX4.x 2nd part",
185 [0x79] = "QNX4.x 3rd part",
186 [0x80] = "Minix until 1.4a",
187 [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager",
188 [0x82] = "Linux swap or Solaris x86",
189 [0x83] = "Linux native",
190 [0x84] = "OS/2 hidden C: drive",
191 [0x85] = "Linux extended",
192 [0x86] = "NTFS volume set??",
193 [0x87] = "NTFS volume set??",
194 [0x93] = "Amoeba file system",
195 [0x94] = "Amoeba bad block table",
196 [0x9F] = "BSD/OS",
197 [0xA0] = "Suspend to Disk",
198 [0xA5] = "FreeBSD/NetBSD/386BSD",
199 [0xA6] = "OpenBSD",
200 [0xA7] = "NeXTSTEP",
201 [0xA9] = "NetBSD",
202 [0xAC] = "IBM JFS",
203 [0xAF] = "HFS+",
204 [0xB7] = "BSDI BSD/386 file system",
205 [0xB8] = "BSDI BSD/386 swap",
206 [0xBE] = "Solaris x86 boot",
207 [0xBF] = "Solaris x86 (new)",
208 [0xC1] = "DRDOS/sec with 12-bit FAT",
209 [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)",
210 [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)",
211 [0xC7] = "Syrinx",
212 [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS",
213 [0xDE] = "DELL Utilities - FAT filesystem",
214 [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition",
215 [0xE3] = "DOS R/O or SpeedStor",
216 [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.",
217 [0xEB] = "BeOS file system",
218 [0xEE] = "EFI GPT",
219 [0xEF] = "EFI System Partition",
220 [0xF1] = "SpeedStor",
221 [0xF2] = "DOS 3.3+ Secondary",
222 [0xF4] = "SpeedStor large partition",
223 [0xFB] = "VMware VMFS",
224 [0xFE] = "SpeedStor >1024 cyl. or LANstep",
225 [0xFF] = "Xenix bad blocks table",
226 };
227
228 static const char *
get_type(int t)229 get_type(int t)
230 {
231 const char *ret;
232
233 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL;
234 return ret ? ret : "unknown";
235 }
236
237
238 static int geom_class_available(const char *);
239 static void print_s0(void);
240 static void print_part(const struct dos_partition *);
241 static void init_sector0(unsigned long start);
242 static void init_boot(void);
243 static void change_part(int i);
244 static void print_params(void);
245 static void change_active(int which);
246 static void change_code(void);
247 static void get_params_to_use(void);
248 static char *get_rootdisk(void);
249 static void dos(struct dos_partition *partp);
250 static int open_disk(int flag);
251 static ssize_t read_disk(off_t sector, void *buf);
252 static int write_disk(off_t sector, void *buf);
253 static int get_params(void);
254 static int read_s0(void);
255 static int write_s0(void);
256 static int ok(const char *str);
257 static int decimal(const char *str, int *num, int deflt, uint32_t maxval);
258 static int read_config(char *config_file);
259 static void reset_boot(void);
260 static int sanitize_partition(struct dos_partition *);
261 static void usage(void);
262
263 int
main(int argc,char * argv[])264 main(int argc, char *argv[])
265 {
266 int c, i;
267 int partition = -1;
268 struct dos_partition *partp;
269
270 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1)
271 switch (c) {
272 case 'B':
273 B_flag = 1;
274 break;
275 case 'I':
276 I_flag = 1;
277 break;
278 case 'a':
279 a_flag = 1;
280 break;
281 case 'b':
282 b_flag = optarg;
283 break;
284 case 'f':
285 f_flag = optarg;
286 break;
287 case 'i':
288 i_flag = 1;
289 break;
290 case 'p':
291 print_config_flag = 1;
292 break;
293 case 'q':
294 q_flag = 1;
295 break;
296 case 's':
297 s_flag = 1;
298 break;
299 case 't':
300 t_flag = 1;
301 break;
302 case 'u':
303 u_flag = 1;
304 break;
305 case 'v':
306 v_flag = 1;
307 break;
308 case '1':
309 case '2':
310 case '3':
311 case '4':
312 partition = c - '0';
313 break;
314 default:
315 usage();
316 }
317 if (f_flag || i_flag)
318 u_flag = 1;
319 if (t_flag)
320 v_flag = 1;
321 argc -= optind;
322 argv += optind;
323
324 if (argc == 0) {
325 disk = get_rootdisk();
326 } else {
327 disk = g_device_path(argv[0]);
328 if (disk == NULL)
329 err(1, "unable to get correct path for %s", argv[0]);
330 }
331 if (open_disk(u_flag) < 0)
332 err(1, "cannot open disk %s", disk);
333
334 /* (abu)use mboot.bootinst to probe for the sector size */
335 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
336 err(1, "cannot allocate buffer to determine disk sector size");
337 if (read_disk(0, mboot.bootinst) == -1)
338 errx(1, "could not detect sector size");
339 free(mboot.bootinst);
340 mboot.bootinst = NULL;
341
342 if (print_config_flag) {
343 if (read_s0())
344 err(1, "read_s0");
345
346 printf("# %s\n", disk);
347 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors);
348
349 for (i = 0; i < NDOSPART; i++) {
350 partp = &mboot.parts[i];
351
352 if (partp->dp_start == 0 && partp->dp_size == 0)
353 continue;
354
355 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ,
356 (u_long)partp->dp_start, (u_long)partp->dp_size);
357
358 /* Fill flags for the partition. */
359 if (partp->dp_flag & 0x80)
360 printf("a %d\n", i + 1);
361 }
362 exit(0);
363 }
364 if (s_flag) {
365 if (read_s0())
366 err(1, "read_s0");
367 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
368 dos_sectors);
369 printf("Part %11s %11s Type Flags\n", "Start", "Size");
370 for (i = 0; i < NDOSPART; i++) {
371 partp = &mboot.parts[i];
372 if (partp->dp_start == 0 && partp->dp_size == 0)
373 continue;
374 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
375 (u_long) partp->dp_start,
376 (u_long) partp->dp_size, partp->dp_typ,
377 partp->dp_flag);
378 }
379 exit(0);
380 }
381
382 printf("******* Working on device %s *******\n",disk);
383
384 if (I_flag) {
385 read_s0();
386 reset_boot();
387 partp = &mboot.parts[0];
388 partp->dp_typ = DOSPTYP_386BSD;
389 partp->dp_flag = ACTIVE;
390 partp->dp_start = dos_sectors;
391 partp->dp_size = rounddown(disksecs, dos_cylsecs) -
392 dos_sectors;
393 dos(partp);
394 if (v_flag)
395 print_s0();
396 if (!t_flag)
397 write_s0();
398 exit(0);
399 }
400 if (f_flag) {
401 if (read_s0() || i_flag)
402 reset_boot();
403 if (!read_config(f_flag))
404 exit(1);
405 if (v_flag)
406 print_s0();
407 if (!t_flag)
408 write_s0();
409 } else {
410 if(u_flag)
411 get_params_to_use();
412 else
413 print_params();
414
415 if (read_s0())
416 init_sector0(dos_sectors);
417
418 printf("Media sector size is %d\n", secsize);
419 printf("Warning: BIOS sector numbering starts with sector 1\n");
420 printf("Information from DOS bootblock is:\n");
421 if (partition == -1)
422 for (i = 1; i <= NDOSPART; i++)
423 change_part(i);
424 else
425 change_part(partition);
426
427 if (u_flag || a_flag)
428 change_active(partition);
429
430 if (B_flag)
431 change_code();
432
433 if (u_flag || a_flag || B_flag) {
434 if (!t_flag) {
435 printf("\nWe haven't changed the partition table yet. ");
436 printf("This is your last chance.\n");
437 }
438 print_s0();
439 if (!t_flag) {
440 if (ok("Should we write new partition table?"))
441 write_s0();
442 } else {
443 printf("\n-t flag specified -- partition table not written.\n");
444 }
445 }
446 }
447
448 exit(0);
449 }
450
451 static void
usage()452 usage()
453 {
454 fprintf(stderr, "%s%s",
455 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n",
456 " fdisk -f configfile [-itv] [disk]\n");
457 exit(1);
458 }
459
460 static void
print_s0(void)461 print_s0(void)
462 {
463 int i;
464
465 print_params();
466 printf("Information from DOS bootblock is:\n");
467 for (i = 1; i <= NDOSPART; i++) {
468 printf("%d: ", i);
469 print_part(&mboot.parts[i - 1]);
470 }
471 }
472
473 static struct dos_partition mtpart;
474
475 static void
print_part(const struct dos_partition * partp)476 print_part(const struct dos_partition *partp)
477 {
478 u_int64_t part_mb;
479
480 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
481 printf("<UNUSED>\n");
482 return;
483 }
484 /*
485 * Be careful not to overflow.
486 */
487 part_mb = partp->dp_size;
488 part_mb *= secsize;
489 part_mb /= (1024 * 1024);
490 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ,
491 get_type(partp->dp_typ));
492 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n",
493 (u_long)partp->dp_start,
494 (u_long)partp->dp_size,
495 (uintmax_t)part_mb,
496 partp->dp_flag,
497 partp->dp_flag == ACTIVE ? " (active)" : "");
498 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
499 ,DPCYL(partp->dp_scyl, partp->dp_ssect)
500 ,partp->dp_shd
501 ,DPSECT(partp->dp_ssect)
502 ,DPCYL(partp->dp_ecyl, partp->dp_esect)
503 ,partp->dp_ehd
504 ,DPSECT(partp->dp_esect));
505 }
506
507
508 static void
init_boot(void)509 init_boot(void)
510 {
511 const char *fname;
512 int fdesc, n;
513 struct stat sb;
514
515 fname = b_flag ? b_flag : "/boot/mbr";
516 if ((fdesc = open(fname, O_RDONLY)) == -1 ||
517 fstat(fdesc, &sb) == -1)
518 err(1, "%s", fname);
519 if (sb.st_size == 0)
520 errx(1, "%s is empty, must not be.", fname);
521 if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
522 errx(1, "%s: length must be a multiple of sector size", fname);
523 if (mboot.bootinst != NULL)
524 free(mboot.bootinst);
525 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
526 errx(1, "%s: unable to allocate read buffer", fname);
527 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
528 close(fdesc))
529 err(1, "%s", fname);
530 if (n != mboot.bootinst_size)
531 errx(1, "%s: short read", fname);
532 }
533
534
535 static void
init_sector0(unsigned long start)536 init_sector0(unsigned long start)
537 {
538 struct dos_partition *partp = &mboot.parts[0];
539
540 init_boot();
541
542 partp->dp_typ = DOSPTYP_386BSD;
543 partp->dp_flag = ACTIVE;
544 start = roundup(start, dos_sectors);
545 if(start == 0)
546 start = dos_sectors;
547 partp->dp_start = start;
548 partp->dp_size = rounddown(disksecs, dos_cylsecs) - start;
549
550 dos(partp);
551 }
552
553 static void
change_part(int i)554 change_part(int i)
555 {
556 struct dos_partition *partp = &mboot.parts[i - 1];
557
558 printf("The data for partition %d is:\n", i);
559 print_part(partp);
560
561 if (u_flag && ok("Do you want to change it?")) {
562 int tmp;
563
564 if (i_flag) {
565 bzero(partp, sizeof (*partp));
566 if (i == 1) {
567 init_sector0(1);
568 printf("\nThe static data for the slice 1 has been reinitialized to:\n");
569 print_part(partp);
570 }
571 }
572
573 do {
574 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255);
575 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS);
576 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS);
577 if (!sanitize_partition(partp)) {
578 warnx("ERROR: failed to adjust; setting sysid to 0");
579 partp->dp_typ = 0;
580 }
581
582 if (ok("Explicitly specify beg/end address ?"))
583 {
584 int tsec,tcyl,thd;
585 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
586 thd = partp->dp_shd;
587 tsec = DPSECT(partp->dp_ssect);
588 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
589 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS);
590 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS);
591 partp->dp_scyl = DOSCYL(tcyl);
592 partp->dp_ssect = DOSSECT(tsec,tcyl);
593 partp->dp_shd = thd;
594
595 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
596 thd = partp->dp_ehd;
597 tsec = DPSECT(partp->dp_esect);
598 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
599 Decimal("ending head", thd, tmp, NO_TRACK_HEADS);
600 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS);
601 partp->dp_ecyl = DOSCYL(tcyl);
602 partp->dp_esect = DOSSECT(tsec,tcyl);
603 partp->dp_ehd = thd;
604 } else
605 dos(partp);
606
607 print_part(partp);
608 } while (!ok("Are we happy with this entry?"));
609 }
610 }
611
612 static void
print_params()613 print_params()
614 {
615 printf("parameters extracted from in-core disklabel are:\n");
616 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
617 ,cyls,heads,sectors,cylsecs);
618 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
619 printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
620 printf("parameters to be used for BIOS calculations are:\n");
621 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
622 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
623 }
624
625 static void
change_active(int which)626 change_active(int which)
627 {
628 struct dos_partition *partp = &mboot.parts[0];
629 int active, i, new, tmp;
630
631 active = -1;
632 for (i = 0; i < NDOSPART; i++) {
633 if ((partp[i].dp_flag & ACTIVE) == 0)
634 continue;
635 printf("Partition %d is marked active\n", i + 1);
636 if (active == -1)
637 active = i + 1;
638 }
639 if (a_flag && which != -1)
640 active = which;
641 else if (active == -1)
642 active = 1;
643
644 if (!ok("Do you want to change the active partition?"))
645 return;
646 setactive:
647 do {
648 new = active;
649 Decimal("active partition", new, tmp, 0);
650 if (new < 1 || new > 4) {
651 printf("Active partition number must be in range 1-4."
652 " Try again.\n");
653 goto setactive;
654 }
655 active = new;
656 } while (!ok("Are you happy with this choice"));
657 for (i = 0; i < NDOSPART; i++)
658 partp[i].dp_flag = 0;
659 if (active > 0 && active <= NDOSPART)
660 partp[active-1].dp_flag = ACTIVE;
661 }
662
663 static void
change_code()664 change_code()
665 {
666 if (ok("Do you want to change the boot code?"))
667 init_boot();
668 }
669
670 void
get_params_to_use()671 get_params_to_use()
672 {
673 int tmp;
674 print_params();
675 if (ok("Do you want to change our idea of what BIOS thinks ?"))
676 {
677 do
678 {
679 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0);
680 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0);
681 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0);
682 dos_cylsecs = dos_heads * dos_sectors;
683 print_params();
684 }
685 while(!ok("Are you happy with this choice"));
686 }
687 }
688
689
690 /***********************************************\
691 * Change real numbers into strange dos numbers *
692 \***********************************************/
693 static void
dos(struct dos_partition * partp)694 dos(struct dos_partition *partp)
695 {
696 int cy, sec;
697 u_int32_t end;
698
699 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
700 memcpy(partp, &mtpart, sizeof(*partp));
701 return;
702 }
703
704 /* Start c/h/s. */
705 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
706 cy = partp->dp_start / dos_cylsecs;
707 sec = partp->dp_start % dos_sectors + 1;
708 partp->dp_scyl = DOSCYL(cy);
709 partp->dp_ssect = DOSSECT(sec, cy);
710
711 /* End c/h/s. */
712 end = partp->dp_start + partp->dp_size - 1;
713 partp->dp_ehd = end % dos_cylsecs / dos_sectors;
714 cy = end / dos_cylsecs;
715 sec = end % dos_sectors + 1;
716 partp->dp_ecyl = DOSCYL(cy);
717 partp->dp_esect = DOSSECT(sec, cy);
718 }
719
720 static int
open_disk(int flag)721 open_disk(int flag)
722 {
723 int rwmode;
724
725 /* Write mode if one of these flags are set. */
726 rwmode = (a_flag || I_flag || B_flag || flag);
727 fd = g_open(disk, rwmode);
728 /* If the mode fails, try read-only if we didn't. */
729 if (fd == -1 && errno == EPERM && rwmode)
730 fd = g_open(disk, 0);
731 if (fd == -1 && errno == ENXIO)
732 return -2;
733 if (fd == -1) {
734 warnx("can't open device %s", disk);
735 return -1;
736 }
737 if (get_params() == -1) {
738 warnx("can't get disk parameters on %s", disk);
739 return -1;
740 }
741 return fd;
742 }
743
744 static ssize_t
read_disk(off_t sector,void * buf)745 read_disk(off_t sector, void *buf)
746 {
747
748 lseek(fd, (sector * 512), 0);
749 if (secsize == 0)
750 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
751 secsize *= 2) {
752 /* try the read */
753 int size = read(fd, buf, secsize);
754 if (size == secsize)
755 /* it worked so return */
756 return secsize;
757 }
758 else
759 return read(fd, buf, secsize);
760
761 /* we failed to read at any of the sizes */
762 return -1;
763 }
764
765 static int
geom_class_available(const char * name)766 geom_class_available(const char *name)
767 {
768 struct gclass *class;
769 struct gmesh mesh;
770 int error;
771
772 error = geom_gettree(&mesh);
773 if (error != 0)
774 errc(1, error, "Cannot get GEOM tree");
775
776 LIST_FOREACH(class, &mesh.lg_class, lg_class) {
777 if (strcmp(class->lg_name, name) == 0) {
778 geom_deletetree(&mesh);
779 return (1);
780 }
781 }
782
783 geom_deletetree(&mesh);
784
785 return (0);
786 }
787
788 static int
write_disk(off_t sector,void * buf)789 write_disk(off_t sector, void *buf)
790 {
791 ssize_t wr;
792
793 /*
794 * Try to write MBR directly. This may help when disk
795 * is not in use.
796 * XXX: hardcoded sectorsize
797 */
798 wr = pwrite(fd, buf, secsize, (sector * 512));
799 if (wr == secsize)
800 return (0);
801
802 if (geom_class_available("PART") != 0)
803 warnx("Failed to write MBR. Try to use gpart(8).");
804 else
805 warnx("Failed to write sector zero");
806 return(EINVAL);
807 }
808
809 static int
get_params()810 get_params()
811 {
812 int error;
813 u_int u;
814 off_t o;
815
816 error = ioctl(fd, DIOCGFWSECTORS, &u);
817 if (error == 0)
818 sectors = dos_sectors = u;
819 else
820 sectors = dos_sectors = 63;
821
822 error = ioctl(fd, DIOCGFWHEADS, &u);
823 if (error == 0)
824 heads = dos_heads = u;
825 else
826 heads = dos_heads = 255;
827
828 dos_cylsecs = cylsecs = heads * sectors;
829 disksecs = cyls * heads * sectors;
830
831 u = g_sectorsize(fd);
832 if (u <= 0)
833 return (-1);
834
835 o = g_mediasize(fd);
836 if (o < 0)
837 return (-1);
838 if (o / u <= NO_DISK_SECTORS)
839 disksecs = o / u;
840 else
841 disksecs = NO_DISK_SECTORS;
842 cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
843
844 return (0);
845 }
846
847 static int
read_s0()848 read_s0()
849 {
850 int i;
851
852 mboot.bootinst_size = secsize;
853 if (mboot.bootinst != NULL)
854 free(mboot.bootinst);
855 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
856 warnx("unable to allocate buffer to read fdisk "
857 "partition table");
858 return -1;
859 }
860 if (read_disk(0, mboot.bootinst) == -1) {
861 warnx("can't read fdisk partition table");
862 return -1;
863 }
864 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
865 warnx("invalid fdisk partition table found");
866 /* So should we initialize things */
867 return -1;
868 }
869 for (i = 0; i < NDOSPART; i++)
870 dos_partition_dec(
871 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
872 &mboot.parts[i]);
873 return 0;
874 }
875
876 static int
write_s0()877 write_s0()
878 {
879 int sector, i;
880
881 if (iotest) {
882 print_s0();
883 return 0;
884 }
885 for(i = 0; i < NDOSPART; i++)
886 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
887 &mboot.parts[i]);
888 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
889 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
890 if (write_disk(sector,
891 &mboot.bootinst[sector * secsize]) == -1) {
892 warn("can't write fdisk partition table");
893 return -1;
894 }
895 return(0);
896 }
897
898
899 static int
ok(const char * str)900 ok(const char *str)
901 {
902 printf("%s [n] ", str);
903 fflush(stdout);
904 if (fgets(lbuf, LBUF, stdin) == NULL)
905 exit(1);
906 lbuf[strlen(lbuf)-1] = 0;
907
908 if (*lbuf &&
909 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
910 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
911 return 1;
912 else
913 return 0;
914 }
915
916 static int
decimal(const char * str,int * num,int deflt,uint32_t maxval)917 decimal(const char *str, int *num, int deflt, uint32_t maxval)
918 {
919 long long acc;
920 int c;
921 char *cp;
922
923 while (1) {
924 acc = 0;
925 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
926 fflush(stdout);
927 if (fgets(lbuf, LBUF, stdin) == NULL)
928 exit(1);
929 lbuf[strlen(lbuf)-1] = 0;
930
931 if (!*lbuf)
932 return 0;
933
934 cp = lbuf;
935 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
936 if (!c)
937 return 0;
938 while ((c = *cp++)) {
939 if (c <= '9' && c >= '0') {
940 if (acc <= maxval || maxval == 0)
941 acc = acc * 10 + c - '0';
942 } else
943 break;
944 }
945 if (c == ' ' || c == '\t')
946 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
947 if (!c) {
948 if (maxval > 0 && acc > maxval) {
949 acc = maxval;
950 printf("%s exceeds maximum value allowed for "
951 "this field. The value has been reduced "
952 "to %lld\n", lbuf, acc);
953 }
954 *num = acc;
955 return 1;
956 } else
957 printf("%s is an invalid decimal number. Try again.\n",
958 lbuf);
959 }
960 }
961
962
963 static void
parse_config_line(char * line,CMD * command)964 parse_config_line(char *line, CMD *command)
965 {
966 char *cp, *end;
967
968 cp = line;
969 while (1) {
970 memset(command, 0, sizeof(*command));
971
972 while (isspace(*cp)) ++cp;
973 if (*cp == '\0' || *cp == '#')
974 break;
975 command->cmd = *cp++;
976
977 /*
978 * Parse args
979 */
980 while (1) {
981 while (isspace(*cp)) ++cp;
982 if (*cp == '\0')
983 break; /* eol */
984 if (*cp == '#')
985 break; /* found comment */
986 if (isalpha(*cp))
987 command->args[command->n_args].argtype = *cp++;
988 end = NULL;
989 command->args[command->n_args].arg_val = strtoul(cp, &end, 0);
990 if (cp == end || (!isspace(*end) && *end != '\0')) {
991 char ch;
992 end = cp;
993 while (!isspace(*end) && *end != '\0') ++end;
994 ch = *end; *end = '\0';
995 command->args[command->n_args].arg_str = strdup(cp);
996 *end = ch;
997 } else
998 command->args[command->n_args].arg_str = NULL;
999 cp = end;
1000 command->n_args++;
1001 }
1002 break;
1003 }
1004 }
1005
1006
1007 static int
process_geometry(CMD * command)1008 process_geometry(CMD *command)
1009 {
1010 int status = 1, i;
1011
1012 while (1) {
1013 geom_processed = 1;
1014 if (part_processed) {
1015 warnx(
1016 "ERROR line %d: the geometry specification line must occur before\n\
1017 all partition specifications",
1018 current_line_number);
1019 status = 0;
1020 break;
1021 }
1022 if (command->n_args != 3) {
1023 warnx("ERROR line %d: incorrect number of geometry args",
1024 current_line_number);
1025 status = 0;
1026 break;
1027 }
1028 dos_cyls = 0;
1029 dos_heads = 0;
1030 dos_sectors = 0;
1031 for (i = 0; i < 3; ++i) {
1032 switch (command->args[i].argtype) {
1033 case 'c':
1034 dos_cyls = command->args[i].arg_val;
1035 break;
1036 case 'h':
1037 dos_heads = command->args[i].arg_val;
1038 break;
1039 case 's':
1040 dos_sectors = command->args[i].arg_val;
1041 break;
1042 default:
1043 warnx(
1044 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
1045 current_line_number, command->args[i].argtype,
1046 command->args[i].argtype);
1047 status = 0;
1048 break;
1049 }
1050 }
1051 if (status == 0)
1052 break;
1053
1054 dos_cylsecs = dos_heads * dos_sectors;
1055
1056 /*
1057 * Do sanity checks on parameter values
1058 */
1059 if (dos_cyls == 0) {
1060 warnx("ERROR line %d: number of cylinders not specified",
1061 current_line_number);
1062 status = 0;
1063 }
1064 if (dos_cyls > 1024) {
1065 warnx(
1066 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\
1067 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
1068 is dedicated to FreeBSD)",
1069 current_line_number, dos_cyls);
1070 }
1071
1072 if (dos_heads == 0) {
1073 warnx("ERROR line %d: number of heads not specified",
1074 current_line_number);
1075 status = 0;
1076 } else if (dos_heads > 256) {
1077 warnx("ERROR line %d: number of heads must be within (1-256)",
1078 current_line_number);
1079 status = 0;
1080 }
1081
1082 if (dos_sectors == 0) {
1083 warnx("ERROR line %d: number of sectors not specified",
1084 current_line_number);
1085 status = 0;
1086 } else if (dos_sectors > 63) {
1087 warnx("ERROR line %d: number of sectors must be within (1-63)",
1088 current_line_number);
1089 status = 0;
1090 }
1091
1092 break;
1093 }
1094 return (status);
1095 }
1096
1097 static u_int32_t
str2sectors(const char * str)1098 str2sectors(const char *str)
1099 {
1100 char *end;
1101 unsigned long val;
1102
1103 val = strtoul(str, &end, 0);
1104 if (str == end || *end == '\0') {
1105 warnx("ERROR line %d: unexpected size: \'%s\'",
1106 current_line_number, str);
1107 return NO_DISK_SECTORS;
1108 }
1109
1110 if (*end == 'K')
1111 val *= 1024UL / secsize;
1112 else if (*end == 'M')
1113 val *= 1024UL * 1024UL / secsize;
1114 else if (*end == 'G')
1115 val *= 1024UL * 1024UL * 1024UL / secsize;
1116 else {
1117 warnx("ERROR line %d: unexpected modifier: %c "
1118 "(not K/M/G)", current_line_number, *end);
1119 return NO_DISK_SECTORS;
1120 }
1121
1122 return val;
1123 }
1124
1125 static int
process_partition(CMD * command)1126 process_partition(CMD *command)
1127 {
1128 int status = 0, partition;
1129 u_int32_t prev_head_boundary, prev_cyl_boundary;
1130 u_int32_t adj_size, max_end;
1131 struct dos_partition *partp;
1132
1133 while (1) {
1134 part_processed = 1;
1135 if (command->n_args != 4) {
1136 warnx("ERROR line %d: incorrect number of partition args",
1137 current_line_number);
1138 break;
1139 }
1140 partition = command->args[0].arg_val;
1141 if (partition < 1 || partition > 4) {
1142 warnx("ERROR line %d: invalid partition number %d",
1143 current_line_number, partition);
1144 break;
1145 }
1146 partp = &mboot.parts[partition - 1];
1147 bzero(partp, sizeof (*partp));
1148 partp->dp_typ = command->args[1].arg_val;
1149 if (command->args[2].arg_str != NULL) {
1150 if (strcmp(command->args[2].arg_str, "*") == 0) {
1151 int i;
1152 partp->dp_start = dos_sectors;
1153 for (i = 1; i < partition; i++) {
1154 struct dos_partition *prev_partp;
1155 prev_partp = ((struct dos_partition *)
1156 &mboot.parts) + i - 1;
1157 if (prev_partp->dp_typ != 0)
1158 partp->dp_start = prev_partp->dp_start +
1159 prev_partp->dp_size;
1160 }
1161 if (partp->dp_start % dos_sectors != 0) {
1162 prev_head_boundary = rounddown(partp->dp_start,
1163 dos_sectors);
1164 partp->dp_start = prev_head_boundary +
1165 dos_sectors;
1166 }
1167 } else {
1168 partp->dp_start = str2sectors(command->args[2].arg_str);
1169 if (partp->dp_start == NO_DISK_SECTORS)
1170 break;
1171 }
1172 } else
1173 partp->dp_start = command->args[2].arg_val;
1174
1175 if (command->args[3].arg_str != NULL) {
1176 if (strcmp(command->args[3].arg_str, "*") == 0)
1177 partp->dp_size = rounddown(disksecs, dos_cylsecs) -
1178 partp->dp_start;
1179 else {
1180 partp->dp_size = str2sectors(command->args[3].arg_str);
1181 if (partp->dp_size == NO_DISK_SECTORS)
1182 break;
1183 }
1184 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size,
1185 dos_cylsecs);
1186 if (prev_cyl_boundary > partp->dp_start)
1187 partp->dp_size = prev_cyl_boundary - partp->dp_start;
1188 } else
1189 partp->dp_size = command->args[3].arg_val;
1190
1191 max_end = partp->dp_start + partp->dp_size;
1192
1193 if (partp->dp_typ == 0) {
1194 /*
1195 * Get out, the partition is marked as unused.
1196 */
1197 /*
1198 * Insure that it's unused.
1199 */
1200 bzero(partp, sizeof(*partp));
1201 status = 1;
1202 break;
1203 }
1204
1205 /*
1206 * Adjust start upwards, if necessary, to fall on a head boundary.
1207 */
1208 if (partp->dp_start % dos_sectors != 0) {
1209 prev_head_boundary = rounddown(partp->dp_start, dos_sectors);
1210 if (max_end < dos_sectors ||
1211 prev_head_boundary > max_end - dos_sectors) {
1212 /*
1213 * Can't go past end of partition
1214 */
1215 warnx(
1216 "ERROR line %d: unable to adjust start of partition %d to fall on\n\
1217 a head boundary",
1218 current_line_number, partition);
1219 break;
1220 }
1221 warnx(
1222 "WARNING: adjusting start offset of partition %d\n\
1223 from %u to %u, to fall on a head boundary",
1224 partition, (u_int)partp->dp_start,
1225 (u_int)(prev_head_boundary + dos_sectors));
1226 partp->dp_start = prev_head_boundary + dos_sectors;
1227 }
1228
1229 /*
1230 * Adjust size downwards, if necessary, to fall on a cylinder
1231 * boundary.
1232 */
1233 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size,
1234 dos_cylsecs);
1235 if (prev_cyl_boundary > partp->dp_start)
1236 adj_size = prev_cyl_boundary - partp->dp_start;
1237 else {
1238 warnx(
1239 "ERROR: could not adjust partition to start on a head boundary\n\
1240 and end on a cylinder boundary.");
1241 return (0);
1242 }
1243 if (adj_size != partp->dp_size) {
1244 warnx(
1245 "WARNING: adjusting size of partition %d from %u to %u\n\
1246 to end on a cylinder boundary",
1247 partition, (u_int)partp->dp_size, (u_int)adj_size);
1248 partp->dp_size = adj_size;
1249 }
1250 if (partp->dp_size == 0) {
1251 warnx("ERROR line %d: size of partition %d is zero",
1252 current_line_number, partition);
1253 break;
1254 }
1255
1256 dos(partp);
1257 status = 1;
1258 break;
1259 }
1260 return (status);
1261 }
1262
1263
1264 static int
process_active(CMD * command)1265 process_active(CMD *command)
1266 {
1267 int status = 0, partition, i;
1268 struct dos_partition *partp;
1269
1270 while (1) {
1271 active_processed = 1;
1272 if (command->n_args != 1) {
1273 warnx("ERROR line %d: incorrect number of active args",
1274 current_line_number);
1275 status = 0;
1276 break;
1277 }
1278 partition = command->args[0].arg_val;
1279 if (partition < 1 || partition > 4) {
1280 warnx("ERROR line %d: invalid partition number %d",
1281 current_line_number, partition);
1282 break;
1283 }
1284 /*
1285 * Reset active partition
1286 */
1287 partp = mboot.parts;
1288 for (i = 0; i < NDOSPART; i++)
1289 partp[i].dp_flag = 0;
1290 partp[partition-1].dp_flag = ACTIVE;
1291
1292 status = 1;
1293 break;
1294 }
1295 return (status);
1296 }
1297
1298
1299 static int
process_line(char * line)1300 process_line(char *line)
1301 {
1302 CMD command;
1303 int status = 1;
1304
1305 while (1) {
1306 parse_config_line(line, &command);
1307 switch (command.cmd) {
1308 case 0:
1309 /*
1310 * Comment or blank line
1311 */
1312 break;
1313 case 'g':
1314 /*
1315 * Set geometry
1316 */
1317 status = process_geometry(&command);
1318 break;
1319 case 'p':
1320 status = process_partition(&command);
1321 break;
1322 case 'a':
1323 status = process_active(&command);
1324 break;
1325 default:
1326 status = 0;
1327 break;
1328 }
1329 break;
1330 }
1331 return (status);
1332 }
1333
1334
1335 static int
read_config(char * config_file)1336 read_config(char *config_file)
1337 {
1338 FILE *fp = NULL;
1339 int status = 1;
1340 char buf[1010];
1341
1342 while (1) {
1343 if (strcmp(config_file, "-") != 0) {
1344 /*
1345 * We're not reading from stdin
1346 */
1347 if ((fp = fopen(config_file, "r")) == NULL) {
1348 status = 0;
1349 break;
1350 }
1351 } else {
1352 fp = stdin;
1353 }
1354 current_line_number = 0;
1355 while (!feof(fp)) {
1356 if (fgets(buf, sizeof(buf), fp) == NULL)
1357 break;
1358 ++current_line_number;
1359 status = process_line(buf);
1360 if (status == 0)
1361 break;
1362 }
1363 break;
1364 }
1365 if (fp) {
1366 /*
1367 * It doesn't matter if we're reading from stdin, as we've reached EOF
1368 */
1369 fclose(fp);
1370 }
1371 return (status);
1372 }
1373
1374
1375 static void
reset_boot(void)1376 reset_boot(void)
1377 {
1378 int i;
1379 struct dos_partition *partp;
1380
1381 init_boot();
1382 for (i = 0; i < 4; ++i) {
1383 partp = &mboot.parts[i];
1384 bzero(partp, sizeof(*partp));
1385 }
1386 }
1387
1388 static int
sanitize_partition(struct dos_partition * partp)1389 sanitize_partition(struct dos_partition *partp)
1390 {
1391 u_int32_t prev_head_boundary, prev_cyl_boundary;
1392 u_int32_t max_end, size, start;
1393
1394 start = partp->dp_start;
1395 size = partp->dp_size;
1396 max_end = start + size;
1397 /* Only allow a zero size if the partition is being marked unused. */
1398 if (size == 0) {
1399 if (start == 0 && partp->dp_typ == 0)
1400 return (1);
1401 warnx("ERROR: size of partition is zero");
1402 return (0);
1403 }
1404 /* Return if no adjustment is necessary. */
1405 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
1406 return (1);
1407
1408 if (start == 0) {
1409 warnx("WARNING: partition overlaps with partition table");
1410 if (ok("Correct this automatically?"))
1411 start = dos_sectors;
1412 }
1413 if (start % dos_sectors != 0)
1414 warnx("WARNING: partition does not start on a head boundary");
1415 if ((start +size) % dos_sectors != 0)
1416 warnx("WARNING: partition does not end on a cylinder boundary");
1417 warnx("WARNING: this may confuse the BIOS or some operating systems");
1418 if (!ok("Correct this automatically?"))
1419 return (1);
1420
1421 /*
1422 * Adjust start upwards, if necessary, to fall on a head boundary.
1423 */
1424 if (start % dos_sectors != 0) {
1425 prev_head_boundary = rounddown(start, dos_sectors);
1426 if (max_end < dos_sectors ||
1427 prev_head_boundary >= max_end - dos_sectors) {
1428 /*
1429 * Can't go past end of partition
1430 */
1431 warnx(
1432 "ERROR: unable to adjust start of partition to fall on a head boundary");
1433 return (0);
1434 }
1435 start = prev_head_boundary + dos_sectors;
1436 }
1437
1438 /*
1439 * Adjust size downwards, if necessary, to fall on a cylinder
1440 * boundary.
1441 */
1442 prev_cyl_boundary = rounddown(start + size, dos_cylsecs);
1443 if (prev_cyl_boundary > start)
1444 size = prev_cyl_boundary - start;
1445 else {
1446 warnx("ERROR: could not adjust partition to start on a head boundary\n\
1447 and end on a cylinder boundary.");
1448 return (0);
1449 }
1450
1451 /* Finally, commit any changes to partp and return. */
1452 if (start != partp->dp_start) {
1453 warnx("WARNING: adjusting start offset of partition to %u",
1454 (u_int)start);
1455 partp->dp_start = start;
1456 }
1457 if (size != partp->dp_size) {
1458 warnx("WARNING: adjusting size of partition to %u", (u_int)size);
1459 partp->dp_size = size;
1460 }
1461
1462 return (1);
1463 }
1464
1465 /*
1466 * Try figuring out the root device's canonical disk name.
1467 * The following choices are considered:
1468 * /dev/ad0s1a => /dev/ad0
1469 * /dev/da0a => /dev/da0
1470 * /dev/vinum/root => /dev/vinum/root
1471 * A ".eli" part is removed if it exists (see geli(8)).
1472 * A ".journal" ending is removed if it exists (see gjournal(8)).
1473 */
1474 static char *
get_rootdisk(void)1475 get_rootdisk(void)
1476 {
1477 struct statfs rootfs;
1478 regex_t re;
1479 #define NMATCHES 2
1480 regmatch_t rm[NMATCHES];
1481 char dev[PATH_MAX], *s;
1482 int rv;
1483
1484 if (statfs("/", &rootfs) == -1)
1485 err(1, "statfs(\"/\")");
1486
1487 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$",
1488 REG_EXTENDED)) != 0)
1489 errx(1, "regcomp() failed (%d)", rv);
1490 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev));
1491 if ((s = strstr(dev, ".eli")) != NULL)
1492 memmove(s, s+4, strlen(s + 4) + 1);
1493
1494 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0)
1495 errx(1,
1496 "mounted root fs resource doesn't match expectations (regexec returned %d)",
1497 rv);
1498 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
1499 errx(1, "out of memory");
1500 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
1501 rm[1].rm_eo - rm[1].rm_so);
1502 s[rm[1].rm_eo - rm[1].rm_so] = 0;
1503
1504 return s;
1505 }
1506