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 Software.Distribution@CS.CMU.EDU
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 #include <sys/disk.h>
29 #include <sys/disklabel.h>
30 #include <sys/diskmbr.h>
31 #include <sys/endian.h>
32 #include <sys/param.h>
33 #include <sys/stat.h>
34 #include <sys/mount.h>
35 #include <ctype.h>
36 #include <fcntl.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <libgeom.h>
40 #include <paths.h>
41 #include <regex.h>
42 #include <stdint.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47
48 #include "fdisk_mbr_enc.h"
49
50 static int iotest;
51
52 #define NO_DISK_SECTORS ((u_int32_t)-1)
53 #define NO_TRACK_CYLINDERS 1023
54 #define NO_TRACK_HEADS 255
55 #define NO_TRACK_SECTORS 63
56 #define LBUF 100
57 static char lbuf[LBUF];
58
59 /*
60 *
61 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
62 *
63 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
64 * Copyright (c) 1989 Robert. V. Baron
65 * Created.
66 */
67
68 #define Decimal(str, ans, tmp, maxval) if (decimal(str, &tmp, ans, maxval)) ans = tmp
69
70 #define MAX_SEC_SIZE 65536 /* maximum sector size that is supported */
71 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
72 static int secsize = 0; /* the sensed sector size */
73
74 static char *disk;
75
76 static int cyls, sectors, heads, cylsecs;
77 static u_int32_t disksecs;
78
79 struct mboot {
80 unsigned char *bootinst; /* boot code */
81 off_t bootinst_size;
82 struct dos_partition parts[NDOSPART];
83 };
84
85 static struct mboot mboot;
86 static int fd;
87
88 #define ACTIVE 0x80
89
90 static uint dos_cyls;
91 static uint dos_heads;
92 static uint dos_sectors;
93 static uint dos_cylsecs;
94
95 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
96 #define DOSCYL(c) (c & 0xff)
97
98 #define MAX_ARGS 10
99
100 static int current_line_number;
101
102 static int geom_processed = 0;
103 static int part_processed = 0;
104 static int active_processed = 0;
105
106 typedef struct cmd {
107 char cmd;
108 int n_args;
109 struct arg {
110 char argtype;
111 unsigned long arg_val;
112 char * arg_str;
113 } args[MAX_ARGS];
114 } CMD;
115
116 static int B_flag = 0; /* replace boot code */
117 static int I_flag = 0; /* use entire disk for FreeBSD */
118 static int a_flag = 0; /* set active partition */
119 static char *b_flag = NULL; /* path to boot code */
120 static int i_flag = 0; /* replace partition data */
121 static int q_flag = 0; /* Be quiet */
122 static int u_flag = 0; /* update partition data */
123 static int s_flag = 0; /* Print a summary and exit */
124 static int t_flag = 0; /* test only */
125 static char *f_flag = NULL; /* Read config info from file */
126 static int v_flag = 0; /* Be verbose */
127 static int print_config_flag = 0;
128
129 /*
130 * A list of partition types, probably outdated.
131 */
132 static const char *const part_types[256] = {
133 [0x00] = "unused",
134 [0x01] = "Primary DOS with 12 bit FAT",
135 [0x02] = "XENIX / file system",
136 [0x03] = "XENIX /usr file system",
137 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)",
138 [0x05] = "Extended DOS",
139 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)",
140 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX",
141 [0x08] = "AIX file system or SplitDrive",
142 [0x09] = "AIX boot partition or Coherent",
143 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap",
144 [0x0B] = "DOS or Windows 95 with 32 bit FAT",
145 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)",
146 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)",
147 [0x0F] = "Extended DOS (LBA)",
148 [0x10] = "OPUS",
149 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT",
150 [0x12] = "Compaq diagnostics",
151 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)",
152 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)",
153 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)",
154 [0x18] = "AST Windows swapfile",
155 [0x1b] = "ASUS Recovery partition (NTFS)",
156 [0x24] = "NEC DOS",
157 [0x3C] = "PartitionMagic recovery",
158 [0x39] = "plan9",
159 [0x40] = "VENIX 286",
160 [0x41] = "Linux/MINIX (sharing disk with DRDOS)",
161 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)",
162 [0x43] = "Linux native (sharing disk with DRDOS)",
163 [0x4D] = "QNX 4.2 Primary",
164 [0x4E] = "QNX 4.2 Secondary",
165 [0x4F] = "QNX 4.2 Tertiary",
166 [0x50] = "DM (disk manager)",
167 [0x51] = "DM6 Aux1 (or Novell)",
168 [0x52] = "CP/M or Microport SysV/AT",
169 [0x53] = "DM6 Aux3",
170 [0x54] = "DM6",
171 [0x55] = "EZ-Drive (disk manager)",
172 [0x56] = "Golden Bow (disk manager)",
173 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */
174 [0x61] = "SpeedStor",
175 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach",
176 [0x64] = "Novell Netware/286 2.xx",
177 [0x65] = "Novell Netware/386 3.xx",
178 [0x6C] = "DragonFlyBSD",
179 [0x70] = "DiskSecure Multi-Boot",
180 [0x75] = "PCIX",
181 [0x77] = "QNX4.x",
182 [0x78] = "QNX4.x 2nd part",
183 [0x79] = "QNX4.x 3rd part",
184 [0x80] = "Minix until 1.4a",
185 [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager",
186 [0x82] = "Linux swap or Solaris x86",
187 [0x83] = "Linux native",
188 [0x84] = "OS/2 hidden C: drive",
189 [0x85] = "Linux extended",
190 [0x86] = "NTFS volume set??",
191 [0x87] = "NTFS volume set??",
192 [0x93] = "Amoeba file system",
193 [0x94] = "Amoeba bad block table",
194 [0x9F] = "BSD/OS",
195 [0xA0] = "Suspend to Disk",
196 [0xA5] = "FreeBSD/NetBSD/386BSD",
197 [0xA6] = "OpenBSD",
198 [0xA7] = "NeXTSTEP",
199 [0xA9] = "NetBSD",
200 [0xAC] = "IBM JFS",
201 [0xAF] = "HFS+",
202 [0xB7] = "BSDI BSD/386 file system",
203 [0xB8] = "BSDI BSD/386 swap",
204 [0xBE] = "Solaris x86 boot",
205 [0xBF] = "Solaris x86 (new)",
206 [0xC1] = "DRDOS/sec with 12-bit FAT",
207 [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)",
208 [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)",
209 [0xC7] = "Syrinx",
210 [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS",
211 [0xDE] = "DELL Utilities - FAT filesystem",
212 [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition",
213 [0xE3] = "DOS R/O or SpeedStor",
214 [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.",
215 [0xEB] = "BeOS file system",
216 [0xEE] = "EFI GPT",
217 [0xEF] = "EFI System Partition",
218 [0xF1] = "SpeedStor",
219 [0xF2] = "DOS 3.3+ Secondary",
220 [0xF4] = "SpeedStor large partition",
221 [0xFB] = "VMware VMFS",
222 [0xFE] = "SpeedStor >1024 cyl. or LANstep",
223 [0xFF] = "Xenix bad blocks table",
224 };
225
226 static const char *
get_type(int t)227 get_type(int t)
228 {
229 const char *ret;
230
231 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL;
232 return ret ? ret : "unknown";
233 }
234
235
236 static int geom_class_available(const char *);
237 static void print_s0(void);
238 static void print_part(const struct dos_partition *);
239 static void init_sector0(unsigned long start);
240 static void init_boot(void);
241 static void change_part(int i);
242 static void print_params(void);
243 static void change_active(int which);
244 static void change_code(void);
245 static void get_params_to_use(void);
246 static char *get_rootdisk(void);
247 static void dos(struct dos_partition *partp);
248 static int open_disk(int flag);
249 static ssize_t read_disk(off_t sector, void *buf);
250 static int write_disk(off_t sector, void *buf);
251 static int get_params(void);
252 static int read_s0(void);
253 static int write_s0(void);
254 static int ok(const char *str);
255 static int decimal(const char *str, int *num, int deflt, uint32_t maxval);
256 static int read_config(char *config_file);
257 static void reset_boot(void);
258 static int sanitize_partition(struct dos_partition *);
259 static void usage(void) __dead2;
260
261 int
main(int argc,char * argv[])262 main(int argc, char *argv[])
263 {
264 int c, i;
265 int partition = -1;
266 struct dos_partition *partp;
267
268 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1)
269 switch (c) {
270 case 'B':
271 B_flag = 1;
272 break;
273 case 'I':
274 I_flag = 1;
275 break;
276 case 'a':
277 a_flag = 1;
278 break;
279 case 'b':
280 b_flag = optarg;
281 break;
282 case 'f':
283 f_flag = optarg;
284 break;
285 case 'i':
286 i_flag = 1;
287 break;
288 case 'p':
289 print_config_flag = 1;
290 break;
291 case 'q':
292 q_flag = 1;
293 break;
294 case 's':
295 s_flag = 1;
296 break;
297 case 't':
298 t_flag = 1;
299 break;
300 case 'u':
301 u_flag = 1;
302 break;
303 case 'v':
304 v_flag = 1;
305 break;
306 case '1':
307 case '2':
308 case '3':
309 case '4':
310 partition = c - '0';
311 break;
312 default:
313 usage();
314 }
315 if (f_flag || i_flag)
316 u_flag = 1;
317 if (t_flag)
318 v_flag = 1;
319 argc -= optind;
320 argv += optind;
321
322 if (argc == 0) {
323 disk = get_rootdisk();
324 } else {
325 disk = g_device_path(argv[0]);
326 if (disk == NULL)
327 err(1, "unable to get correct path for %s", argv[0]);
328 }
329 if (open_disk(u_flag) < 0)
330 err(1, "cannot open disk %s", disk);
331
332 /* (abu)use mboot.bootinst to probe for the sector size */
333 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
334 err(1, "cannot allocate buffer to determine disk sector size");
335 if (read_disk(0, mboot.bootinst) == -1)
336 errx(1, "could not detect sector size");
337 free(mboot.bootinst);
338 mboot.bootinst = NULL;
339
340 if (print_config_flag) {
341 if (read_s0())
342 err(1, "read_s0");
343
344 printf("# %s\n", disk);
345 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors);
346
347 for (i = 0; i < NDOSPART; i++) {
348 partp = &mboot.parts[i];
349
350 if (partp->dp_start == 0 && partp->dp_size == 0)
351 continue;
352
353 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ,
354 (u_long)partp->dp_start, (u_long)partp->dp_size);
355
356 /* Fill flags for the partition. */
357 if (partp->dp_flag & 0x80)
358 printf("a %d\n", i + 1);
359 }
360 exit(0);
361 }
362 if (s_flag) {
363 if (read_s0())
364 err(1, "read_s0");
365 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
366 dos_sectors);
367 printf("Part %11s %11s Type Flags\n", "Start", "Size");
368 for (i = 0; i < NDOSPART; i++) {
369 partp = &mboot.parts[i];
370 if (partp->dp_start == 0 && partp->dp_size == 0)
371 continue;
372 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
373 (u_long) partp->dp_start,
374 (u_long) partp->dp_size, partp->dp_typ,
375 partp->dp_flag);
376 }
377 exit(0);
378 }
379
380 printf("******* Working on device %s *******\n",disk);
381
382 if (I_flag) {
383 read_s0();
384 reset_boot();
385 partp = &mboot.parts[0];
386 partp->dp_typ = DOSPTYP_386BSD;
387 partp->dp_flag = ACTIVE;
388 partp->dp_start = dos_sectors;
389 partp->dp_size = rounddown(disksecs, dos_cylsecs) -
390 dos_sectors;
391 dos(partp);
392 if (v_flag)
393 print_s0();
394 if (!t_flag)
395 write_s0();
396 exit(0);
397 }
398 if (f_flag) {
399 if (read_s0() || i_flag)
400 reset_boot();
401 if (!read_config(f_flag))
402 exit(1);
403 if (v_flag)
404 print_s0();
405 if (!t_flag)
406 write_s0();
407 } else {
408 if(u_flag)
409 get_params_to_use();
410 else
411 print_params();
412
413 if (read_s0())
414 init_sector0(dos_sectors);
415
416 printf("Media sector size is %d\n", secsize);
417 printf("Warning: BIOS sector numbering starts with sector 1\n");
418 printf("Information from DOS bootblock is:\n");
419 if (partition == -1)
420 for (i = 1; i <= NDOSPART; i++)
421 change_part(i);
422 else
423 change_part(partition);
424
425 if (u_flag || a_flag)
426 change_active(partition);
427
428 if (B_flag)
429 change_code();
430
431 if (u_flag || a_flag || B_flag) {
432 if (!t_flag) {
433 printf("\nWe haven't changed the partition table yet. ");
434 printf("This is your last chance.\n");
435 }
436 print_s0();
437 if (!t_flag) {
438 if (ok("Should we write new partition table?"))
439 write_s0();
440 } else {
441 printf("\n-t flag specified -- partition table not written.\n");
442 }
443 }
444 }
445
446 exit(0);
447 }
448
449 static void
usage(void)450 usage(void)
451 {
452 fprintf(stderr, "%s%s",
453 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n",
454 " fdisk -f configfile [-itv] [disk]\n");
455 exit(1);
456 }
457
458 static void
print_s0(void)459 print_s0(void)
460 {
461 int i;
462
463 print_params();
464 printf("Information from DOS bootblock is:\n");
465 for (i = 1; i <= NDOSPART; i++) {
466 printf("%d: ", i);
467 print_part(&mboot.parts[i - 1]);
468 }
469 }
470
471 static struct dos_partition mtpart;
472
473 static void
print_part(const struct dos_partition * partp)474 print_part(const struct dos_partition *partp)
475 {
476 u_int64_t part_mb;
477
478 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
479 printf("<UNUSED>\n");
480 return;
481 }
482 /*
483 * Be careful not to overflow.
484 */
485 part_mb = partp->dp_size;
486 part_mb *= secsize;
487 part_mb /= (1024 * 1024);
488 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ,
489 get_type(partp->dp_typ));
490 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n",
491 (u_long)partp->dp_start,
492 (u_long)partp->dp_size,
493 (uintmax_t)part_mb,
494 partp->dp_flag,
495 partp->dp_flag == ACTIVE ? " (active)" : "");
496 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
497 ,DPCYL(partp->dp_scyl, partp->dp_ssect)
498 ,partp->dp_shd
499 ,DPSECT(partp->dp_ssect)
500 ,DPCYL(partp->dp_ecyl, partp->dp_esect)
501 ,partp->dp_ehd
502 ,DPSECT(partp->dp_esect));
503 }
504
505
506 static void
init_boot(void)507 init_boot(void)
508 {
509 const char *fname;
510 int fdesc, n;
511 struct stat sb;
512
513 fname = b_flag ? b_flag : "/boot/mbr";
514 if ((fdesc = open(fname, O_RDONLY)) == -1 ||
515 fstat(fdesc, &sb) == -1)
516 err(1, "%s", fname);
517 if (sb.st_size == 0)
518 errx(1, "%s is empty, must not be.", fname);
519 if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
520 errx(1, "%s: length must be a multiple of sector size", fname);
521 if (mboot.bootinst != NULL)
522 free(mboot.bootinst);
523 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
524 errx(1, "%s: unable to allocate read buffer", fname);
525 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
526 close(fdesc))
527 err(1, "%s", fname);
528 if (n != mboot.bootinst_size)
529 errx(1, "%s: short read", fname);
530 }
531
532
533 static void
init_sector0(unsigned long start)534 init_sector0(unsigned long start)
535 {
536 struct dos_partition *partp = &mboot.parts[0];
537
538 init_boot();
539
540 partp->dp_typ = DOSPTYP_386BSD;
541 partp->dp_flag = ACTIVE;
542 start = roundup(start, dos_sectors);
543 if(start == 0)
544 start = dos_sectors;
545 partp->dp_start = start;
546 partp->dp_size = rounddown(disksecs, dos_cylsecs) - start;
547
548 dos(partp);
549 }
550
551 static void
change_part(int i)552 change_part(int i)
553 {
554 struct dos_partition *partp = &mboot.parts[i - 1];
555
556 printf("The data for partition %d is:\n", i);
557 print_part(partp);
558
559 if (u_flag && ok("Do you want to change it?")) {
560 int tmp;
561
562 if (i_flag) {
563 bzero(partp, sizeof (*partp));
564 if (i == 1) {
565 init_sector0(1);
566 printf("\nThe static data for the slice 1 has been reinitialized to:\n");
567 print_part(partp);
568 }
569 }
570
571 do {
572 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255);
573 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS);
574 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS);
575 if (!sanitize_partition(partp)) {
576 warnx("ERROR: failed to adjust; setting sysid to 0");
577 partp->dp_typ = 0;
578 }
579
580 if (ok("Explicitly specify beg/end address ?"))
581 {
582 int tsec,tcyl,thd;
583 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
584 thd = partp->dp_shd;
585 tsec = DPSECT(partp->dp_ssect);
586 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
587 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS);
588 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS);
589 partp->dp_scyl = DOSCYL(tcyl);
590 partp->dp_ssect = DOSSECT(tsec,tcyl);
591 partp->dp_shd = thd;
592
593 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
594 thd = partp->dp_ehd;
595 tsec = DPSECT(partp->dp_esect);
596 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
597 Decimal("ending head", thd, tmp, NO_TRACK_HEADS);
598 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS);
599 partp->dp_ecyl = DOSCYL(tcyl);
600 partp->dp_esect = DOSSECT(tsec,tcyl);
601 partp->dp_ehd = thd;
602 } else
603 dos(partp);
604
605 print_part(partp);
606 } while (!ok("Are we happy with this entry?"));
607 }
608 }
609
610 static void
print_params(void)611 print_params(void)
612 {
613 printf("parameters extracted from in-core disklabel are:\n");
614 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
615 ,cyls,heads,sectors,cylsecs);
616 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
617 printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
618 printf("parameters to be used for BIOS calculations are:\n");
619 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
620 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
621 }
622
623 static void
change_active(int which)624 change_active(int which)
625 {
626 struct dos_partition *partp = &mboot.parts[0];
627 int active, i, new, tmp;
628
629 active = -1;
630 for (i = 0; i < NDOSPART; i++) {
631 if ((partp[i].dp_flag & ACTIVE) == 0)
632 continue;
633 printf("Partition %d is marked active\n", i + 1);
634 if (active == -1)
635 active = i + 1;
636 }
637 if (a_flag && which != -1)
638 active = which;
639 else if (active == -1)
640 active = 1;
641
642 if (!ok("Do you want to change the active partition?"))
643 return;
644 setactive:
645 do {
646 new = active;
647 Decimal("active partition", new, tmp, 0);
648 if (new < 1 || new > 4) {
649 printf("Active partition number must be in range 1-4."
650 " Try again.\n");
651 goto setactive;
652 }
653 active = new;
654 } while (!ok("Are you happy with this choice"));
655 for (i = 0; i < NDOSPART; i++)
656 partp[i].dp_flag = 0;
657 if (active > 0 && active <= NDOSPART)
658 partp[active-1].dp_flag = ACTIVE;
659 }
660
661 static void
change_code(void)662 change_code(void)
663 {
664 if (ok("Do you want to change the boot code?"))
665 init_boot();
666 }
667
668 void
get_params_to_use(void)669 get_params_to_use(void)
670 {
671 int tmp;
672 print_params();
673 if (ok("Do you want to change our idea of what BIOS thinks ?"))
674 {
675 do
676 {
677 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0);
678 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0);
679 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0);
680 dos_cylsecs = dos_heads * dos_sectors;
681 print_params();
682 }
683 while(!ok("Are you happy with this choice"));
684 }
685 }
686
687
688 /***********************************************\
689 * Change real numbers into strange dos numbers *
690 \***********************************************/
691 static void
dos(struct dos_partition * partp)692 dos(struct dos_partition *partp)
693 {
694 int cy, sec;
695 u_int32_t end;
696
697 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
698 memcpy(partp, &mtpart, sizeof(*partp));
699 return;
700 }
701
702 /* Start c/h/s. */
703 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
704 cy = partp->dp_start / dos_cylsecs;
705 sec = partp->dp_start % dos_sectors + 1;
706 partp->dp_scyl = DOSCYL(cy);
707 partp->dp_ssect = DOSSECT(sec, cy);
708
709 /* End c/h/s. */
710 end = partp->dp_start + partp->dp_size - 1;
711 partp->dp_ehd = end % dos_cylsecs / dos_sectors;
712 cy = end / dos_cylsecs;
713 sec = end % dos_sectors + 1;
714 partp->dp_ecyl = DOSCYL(cy);
715 partp->dp_esect = DOSSECT(sec, cy);
716 }
717
718 static int
open_disk(int flag)719 open_disk(int flag)
720 {
721 int rwmode;
722
723 /* Write mode if one of these flags are set. */
724 rwmode = (a_flag || I_flag || B_flag || flag);
725 fd = g_open(disk, rwmode);
726 /* If the mode fails, try read-only if we didn't. */
727 if (fd == -1 && errno == EPERM && rwmode)
728 fd = g_open(disk, 0);
729 if (fd == -1 && errno == ENXIO)
730 return -2;
731 if (fd == -1) {
732 warnx("can't open device %s", disk);
733 return -1;
734 }
735 if (get_params() == -1) {
736 warnx("can't get disk parameters on %s", disk);
737 return -1;
738 }
739 return fd;
740 }
741
742 static ssize_t
read_disk(off_t sector,void * buf)743 read_disk(off_t sector, void *buf)
744 {
745
746 lseek(fd, (sector * 512), 0);
747 if (secsize == 0)
748 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
749 secsize *= 2) {
750 /* try the read */
751 int size = read(fd, buf, secsize);
752 if (size == secsize)
753 /* it worked so return */
754 return secsize;
755 }
756 else
757 return read(fd, buf, secsize);
758
759 /* we failed to read at any of the sizes */
760 return -1;
761 }
762
763 static int
geom_class_available(const char * name)764 geom_class_available(const char *name)
765 {
766 struct gclass *class;
767 struct gmesh mesh;
768 int error;
769
770 error = geom_gettree(&mesh);
771 if (error != 0)
772 errc(1, error, "Cannot get GEOM tree");
773
774 LIST_FOREACH(class, &mesh.lg_class, lg_class) {
775 if (strcmp(class->lg_name, name) == 0) {
776 geom_deletetree(&mesh);
777 return (1);
778 }
779 }
780
781 geom_deletetree(&mesh);
782
783 return (0);
784 }
785
786 static int
write_disk(off_t sector,void * buf)787 write_disk(off_t sector, void *buf)
788 {
789 ssize_t wr;
790
791 /*
792 * Try to write MBR directly. This may help when disk
793 * is not in use.
794 * XXX: hardcoded sectorsize
795 */
796 wr = pwrite(fd, buf, secsize, (sector * 512));
797 if (wr == secsize)
798 return (0);
799
800 if (geom_class_available("PART") != 0)
801 warnx("Failed to write MBR. Try to use gpart(8).");
802 else
803 warnx("Failed to write sector zero");
804 return(EINVAL);
805 }
806
807 static int
get_params(void)808 get_params(void)
809 {
810 int error;
811 u_int u;
812 off_t o;
813
814 error = ioctl(fd, DIOCGFWSECTORS, &u);
815 if (error == 0)
816 sectors = dos_sectors = u;
817 else
818 sectors = dos_sectors = 63;
819
820 error = ioctl(fd, DIOCGFWHEADS, &u);
821 if (error == 0)
822 heads = dos_heads = u;
823 else
824 heads = dos_heads = 255;
825
826 dos_cylsecs = cylsecs = heads * sectors;
827 disksecs = cyls * heads * sectors;
828
829 u = g_sectorsize(fd);
830 if (u <= 0)
831 return (-1);
832
833 o = g_mediasize(fd);
834 if (o < 0)
835 return (-1);
836 if (o / u <= NO_DISK_SECTORS)
837 disksecs = o / u;
838 else
839 disksecs = NO_DISK_SECTORS;
840 cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
841
842 return (0);
843 }
844
845 static int
read_s0(void)846 read_s0(void)
847 {
848 int i;
849
850 mboot.bootinst_size = secsize;
851 if (mboot.bootinst != NULL)
852 free(mboot.bootinst);
853 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
854 warnx("unable to allocate buffer to read fdisk "
855 "partition table");
856 return -1;
857 }
858 if (read_disk(0, mboot.bootinst) == -1) {
859 warnx("can't read fdisk partition table");
860 return -1;
861 }
862 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
863 warnx("invalid fdisk partition table found");
864 /* So should we initialize things */
865 return -1;
866 }
867 for (i = 0; i < NDOSPART; i++)
868 dos_partition_dec(
869 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
870 &mboot.parts[i]);
871 return 0;
872 }
873
874 static int
write_s0(void)875 write_s0(void)
876 {
877 int sector, i;
878
879 if (iotest) {
880 print_s0();
881 return 0;
882 }
883 for(i = 0; i < NDOSPART; i++)
884 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
885 &mboot.parts[i]);
886 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
887 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
888 if (write_disk(sector,
889 &mboot.bootinst[sector * secsize]) == -1) {
890 warn("can't write fdisk partition table");
891 return -1;
892 }
893 return(0);
894 }
895
896
897 static int
ok(const char * str)898 ok(const char *str)
899 {
900 printf("%s [n] ", str);
901 fflush(stdout);
902 if (fgets(lbuf, LBUF, stdin) == NULL)
903 exit(1);
904 lbuf[strlen(lbuf)-1] = 0;
905
906 if (*lbuf &&
907 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
908 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
909 return 1;
910 else
911 return 0;
912 }
913
914 static int
decimal(const char * str,int * num,int deflt,uint32_t maxval)915 decimal(const char *str, int *num, int deflt, uint32_t maxval)
916 {
917 long long acc;
918 int c;
919 char *cp;
920
921 while (1) {
922 acc = 0;
923 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
924 fflush(stdout);
925 if (fgets(lbuf, LBUF, stdin) == NULL)
926 exit(1);
927 lbuf[strlen(lbuf)-1] = 0;
928
929 if (!*lbuf)
930 return 0;
931
932 cp = lbuf;
933 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
934 if (!c)
935 return 0;
936 while ((c = *cp++)) {
937 if (c <= '9' && c >= '0') {
938 if (acc <= maxval || maxval == 0)
939 acc = acc * 10 + c - '0';
940 } else
941 break;
942 }
943 if (c == ' ' || c == '\t')
944 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
945 if (!c) {
946 if (maxval > 0 && acc > maxval) {
947 acc = maxval;
948 printf("%s exceeds maximum value allowed for "
949 "this field. The value has been reduced "
950 "to %lld\n", lbuf, acc);
951 }
952 *num = acc;
953 return 1;
954 } else
955 printf("%s is an invalid decimal number. Try again.\n",
956 lbuf);
957 }
958 }
959
960
961 static void
parse_config_line(char * line,CMD * command)962 parse_config_line(char *line, CMD *command)
963 {
964 char *cp, *end;
965
966 cp = line;
967 while (1) {
968 memset(command, 0, sizeof(*command));
969
970 while (isspace(*cp)) ++cp;
971 if (*cp == '\0' || *cp == '#')
972 break;
973 command->cmd = *cp++;
974
975 /*
976 * Parse args
977 */
978 while (1) {
979 while (isspace(*cp)) ++cp;
980 if (*cp == '\0')
981 break; /* eol */
982 if (*cp == '#')
983 break; /* found comment */
984 if (isalpha(*cp))
985 command->args[command->n_args].argtype = *cp++;
986 end = NULL;
987 command->args[command->n_args].arg_val = strtoul(cp, &end, 0);
988 if (cp == end || (!isspace(*end) && *end != '\0')) {
989 char ch;
990 end = cp;
991 while (!isspace(*end) && *end != '\0') ++end;
992 ch = *end; *end = '\0';
993 command->args[command->n_args].arg_str = strdup(cp);
994 *end = ch;
995 } else
996 command->args[command->n_args].arg_str = NULL;
997 cp = end;
998 command->n_args++;
999 }
1000 break;
1001 }
1002 }
1003
1004
1005 static int
process_geometry(CMD * command)1006 process_geometry(CMD *command)
1007 {
1008 int status = 1, i;
1009
1010 while (1) {
1011 geom_processed = 1;
1012 if (part_processed) {
1013 warnx(
1014 "ERROR line %d: the geometry specification line must occur before\n\
1015 all partition specifications",
1016 current_line_number);
1017 status = 0;
1018 break;
1019 }
1020 if (command->n_args != 3) {
1021 warnx("ERROR line %d: incorrect number of geometry args",
1022 current_line_number);
1023 status = 0;
1024 break;
1025 }
1026 dos_cyls = 0;
1027 dos_heads = 0;
1028 dos_sectors = 0;
1029 for (i = 0; i < 3; ++i) {
1030 switch (command->args[i].argtype) {
1031 case 'c':
1032 dos_cyls = command->args[i].arg_val;
1033 break;
1034 case 'h':
1035 dos_heads = command->args[i].arg_val;
1036 break;
1037 case 's':
1038 dos_sectors = command->args[i].arg_val;
1039 break;
1040 default:
1041 warnx(
1042 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
1043 current_line_number, command->args[i].argtype,
1044 command->args[i].argtype);
1045 status = 0;
1046 break;
1047 }
1048 }
1049 if (status == 0)
1050 break;
1051
1052 dos_cylsecs = dos_heads * dos_sectors;
1053
1054 /*
1055 * Do sanity checks on parameter values
1056 */
1057 if (dos_cyls == 0) {
1058 warnx("ERROR line %d: number of cylinders not specified",
1059 current_line_number);
1060 status = 0;
1061 }
1062 if (dos_cyls > 1024) {
1063 warnx(
1064 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\
1065 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
1066 is dedicated to FreeBSD)",
1067 current_line_number, dos_cyls);
1068 }
1069
1070 if (dos_heads == 0) {
1071 warnx("ERROR line %d: number of heads not specified",
1072 current_line_number);
1073 status = 0;
1074 } else if (dos_heads > 256) {
1075 warnx("ERROR line %d: number of heads must be within (1-256)",
1076 current_line_number);
1077 status = 0;
1078 }
1079
1080 if (dos_sectors == 0) {
1081 warnx("ERROR line %d: number of sectors not specified",
1082 current_line_number);
1083 status = 0;
1084 } else if (dos_sectors > 63) {
1085 warnx("ERROR line %d: number of sectors must be within (1-63)",
1086 current_line_number);
1087 status = 0;
1088 }
1089
1090 break;
1091 }
1092 return (status);
1093 }
1094
1095 static u_int32_t
str2sectors(const char * str)1096 str2sectors(const char *str)
1097 {
1098 char *end;
1099 unsigned long val;
1100
1101 val = strtoul(str, &end, 0);
1102 if (str == end || *end == '\0') {
1103 warnx("ERROR line %d: unexpected size: \'%s\'",
1104 current_line_number, str);
1105 return NO_DISK_SECTORS;
1106 }
1107
1108 if (*end == 'K')
1109 val *= 1024UL / secsize;
1110 else if (*end == 'M')
1111 val *= 1024UL * 1024UL / secsize;
1112 else if (*end == 'G')
1113 val *= 1024UL * 1024UL * 1024UL / secsize;
1114 else {
1115 warnx("ERROR line %d: unexpected modifier: %c "
1116 "(not K/M/G)", current_line_number, *end);
1117 return NO_DISK_SECTORS;
1118 }
1119
1120 return val;
1121 }
1122
1123 static int
process_partition(CMD * command)1124 process_partition(CMD *command)
1125 {
1126 int status = 0, partition;
1127 u_int32_t prev_head_boundary, prev_cyl_boundary;
1128 u_int32_t adj_size, max_end;
1129 struct dos_partition *partp;
1130
1131 while (1) {
1132 part_processed = 1;
1133 if (command->n_args != 4) {
1134 warnx("ERROR line %d: incorrect number of partition args",
1135 current_line_number);
1136 break;
1137 }
1138 partition = command->args[0].arg_val;
1139 if (partition < 1 || partition > 4) {
1140 warnx("ERROR line %d: invalid partition number %d",
1141 current_line_number, partition);
1142 break;
1143 }
1144 partp = &mboot.parts[partition - 1];
1145 bzero(partp, sizeof (*partp));
1146 partp->dp_typ = command->args[1].arg_val;
1147 if (command->args[2].arg_str != NULL) {
1148 if (strcmp(command->args[2].arg_str, "*") == 0) {
1149 int i;
1150 partp->dp_start = dos_sectors;
1151 for (i = 1; i < partition; i++) {
1152 struct dos_partition *prev_partp;
1153 prev_partp = ((struct dos_partition *)
1154 &mboot.parts) + i - 1;
1155 if (prev_partp->dp_typ != 0)
1156 partp->dp_start = prev_partp->dp_start +
1157 prev_partp->dp_size;
1158 }
1159 if (partp->dp_start % dos_sectors != 0) {
1160 prev_head_boundary = rounddown(partp->dp_start,
1161 dos_sectors);
1162 partp->dp_start = prev_head_boundary +
1163 dos_sectors;
1164 }
1165 } else {
1166 partp->dp_start = str2sectors(command->args[2].arg_str);
1167 if (partp->dp_start == NO_DISK_SECTORS)
1168 break;
1169 }
1170 } else
1171 partp->dp_start = command->args[2].arg_val;
1172
1173 if (command->args[3].arg_str != NULL) {
1174 if (strcmp(command->args[3].arg_str, "*") == 0)
1175 partp->dp_size = rounddown(disksecs, dos_cylsecs) -
1176 partp->dp_start;
1177 else {
1178 partp->dp_size = str2sectors(command->args[3].arg_str);
1179 if (partp->dp_size == NO_DISK_SECTORS)
1180 break;
1181 }
1182 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size,
1183 dos_cylsecs);
1184 if (prev_cyl_boundary > partp->dp_start)
1185 partp->dp_size = prev_cyl_boundary - partp->dp_start;
1186 } else
1187 partp->dp_size = command->args[3].arg_val;
1188
1189 max_end = partp->dp_start + partp->dp_size;
1190
1191 if (partp->dp_typ == 0) {
1192 /*
1193 * Get out, the partition is marked as unused.
1194 */
1195 /*
1196 * Insure that it's unused.
1197 */
1198 bzero(partp, sizeof(*partp));
1199 status = 1;
1200 break;
1201 }
1202
1203 /*
1204 * Adjust start upwards, if necessary, to fall on a head boundary.
1205 */
1206 if (partp->dp_start % dos_sectors != 0) {
1207 prev_head_boundary = rounddown(partp->dp_start, dos_sectors);
1208 if (max_end < dos_sectors ||
1209 prev_head_boundary > max_end - dos_sectors) {
1210 /*
1211 * Can't go past end of partition
1212 */
1213 warnx(
1214 "ERROR line %d: unable to adjust start of partition %d to fall on\n\
1215 a head boundary",
1216 current_line_number, partition);
1217 break;
1218 }
1219 warnx(
1220 "WARNING: adjusting start offset of partition %d\n\
1221 from %u to %u, to fall on a head boundary",
1222 partition, (u_int)partp->dp_start,
1223 (u_int)(prev_head_boundary + dos_sectors));
1224 partp->dp_start = prev_head_boundary + dos_sectors;
1225 }
1226
1227 /*
1228 * Adjust size downwards, if necessary, to fall on a cylinder
1229 * boundary.
1230 */
1231 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size,
1232 dos_cylsecs);
1233 if (prev_cyl_boundary > partp->dp_start)
1234 adj_size = prev_cyl_boundary - partp->dp_start;
1235 else {
1236 warnx(
1237 "ERROR: could not adjust partition to start on a head boundary\n\
1238 and end on a cylinder boundary.");
1239 return (0);
1240 }
1241 if (adj_size != partp->dp_size) {
1242 warnx(
1243 "WARNING: adjusting size of partition %d from %u to %u\n\
1244 to end on a cylinder boundary",
1245 partition, (u_int)partp->dp_size, (u_int)adj_size);
1246 partp->dp_size = adj_size;
1247 }
1248 if (partp->dp_size == 0) {
1249 warnx("ERROR line %d: size of partition %d is zero",
1250 current_line_number, partition);
1251 break;
1252 }
1253
1254 dos(partp);
1255 status = 1;
1256 break;
1257 }
1258 return (status);
1259 }
1260
1261
1262 static int
process_active(CMD * command)1263 process_active(CMD *command)
1264 {
1265 int status = 0, partition, i;
1266 struct dos_partition *partp;
1267
1268 while (1) {
1269 active_processed = 1;
1270 if (command->n_args != 1) {
1271 warnx("ERROR line %d: incorrect number of active args",
1272 current_line_number);
1273 status = 0;
1274 break;
1275 }
1276 partition = command->args[0].arg_val;
1277 if (partition < 1 || partition > 4) {
1278 warnx("ERROR line %d: invalid partition number %d",
1279 current_line_number, partition);
1280 break;
1281 }
1282 /*
1283 * Reset active partition
1284 */
1285 partp = mboot.parts;
1286 for (i = 0; i < NDOSPART; i++)
1287 partp[i].dp_flag = 0;
1288 partp[partition-1].dp_flag = ACTIVE;
1289
1290 status = 1;
1291 break;
1292 }
1293 return (status);
1294 }
1295
1296
1297 static int
process_line(char * line)1298 process_line(char *line)
1299 {
1300 CMD command;
1301 int status = 1;
1302
1303 while (1) {
1304 parse_config_line(line, &command);
1305 switch (command.cmd) {
1306 case 0:
1307 /*
1308 * Comment or blank line
1309 */
1310 break;
1311 case 'g':
1312 /*
1313 * Set geometry
1314 */
1315 status = process_geometry(&command);
1316 break;
1317 case 'p':
1318 status = process_partition(&command);
1319 break;
1320 case 'a':
1321 status = process_active(&command);
1322 break;
1323 default:
1324 status = 0;
1325 break;
1326 }
1327 break;
1328 }
1329 return (status);
1330 }
1331
1332
1333 static int
read_config(char * config_file)1334 read_config(char *config_file)
1335 {
1336 FILE *fp = NULL;
1337 int status = 1;
1338 char buf[1010];
1339
1340 while (1) {
1341 if (strcmp(config_file, "-") != 0) {
1342 /*
1343 * We're not reading from stdin
1344 */
1345 if ((fp = fopen(config_file, "r")) == NULL) {
1346 status = 0;
1347 break;
1348 }
1349 } else {
1350 fp = stdin;
1351 }
1352 current_line_number = 0;
1353 while (!feof(fp)) {
1354 if (fgets(buf, sizeof(buf), fp) == NULL)
1355 break;
1356 ++current_line_number;
1357 status = process_line(buf);
1358 if (status == 0)
1359 break;
1360 }
1361 break;
1362 }
1363 if (fp) {
1364 /*
1365 * It doesn't matter if we're reading from stdin, as we've reached EOF
1366 */
1367 fclose(fp);
1368 }
1369 return (status);
1370 }
1371
1372
1373 static void
reset_boot(void)1374 reset_boot(void)
1375 {
1376 int i;
1377 struct dos_partition *partp;
1378
1379 init_boot();
1380 for (i = 0; i < 4; ++i) {
1381 partp = &mboot.parts[i];
1382 bzero(partp, sizeof(*partp));
1383 }
1384 }
1385
1386 static int
sanitize_partition(struct dos_partition * partp)1387 sanitize_partition(struct dos_partition *partp)
1388 {
1389 u_int32_t prev_head_boundary, prev_cyl_boundary;
1390 u_int32_t max_end, size, start;
1391
1392 start = partp->dp_start;
1393 size = partp->dp_size;
1394 max_end = start + size;
1395 /* Only allow a zero size if the partition is being marked unused. */
1396 if (size == 0) {
1397 if (start == 0 && partp->dp_typ == 0)
1398 return (1);
1399 warnx("ERROR: size of partition is zero");
1400 return (0);
1401 }
1402 /* Return if no adjustment is necessary. */
1403 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
1404 return (1);
1405
1406 if (start == 0) {
1407 warnx("WARNING: partition overlaps with partition table");
1408 if (ok("Correct this automatically?"))
1409 start = dos_sectors;
1410 }
1411 if (start % dos_sectors != 0)
1412 warnx("WARNING: partition does not start on a head boundary");
1413 if ((start +size) % dos_sectors != 0)
1414 warnx("WARNING: partition does not end on a cylinder boundary");
1415 warnx("WARNING: this may confuse the BIOS or some operating systems");
1416 if (!ok("Correct this automatically?"))
1417 return (1);
1418
1419 /*
1420 * Adjust start upwards, if necessary, to fall on a head boundary.
1421 */
1422 if (start % dos_sectors != 0) {
1423 prev_head_boundary = rounddown(start, dos_sectors);
1424 if (max_end < dos_sectors ||
1425 prev_head_boundary >= max_end - dos_sectors) {
1426 /*
1427 * Can't go past end of partition
1428 */
1429 warnx(
1430 "ERROR: unable to adjust start of partition to fall on a head boundary");
1431 return (0);
1432 }
1433 start = prev_head_boundary + dos_sectors;
1434 }
1435
1436 /*
1437 * Adjust size downwards, if necessary, to fall on a cylinder
1438 * boundary.
1439 */
1440 prev_cyl_boundary = rounddown(start + size, dos_cylsecs);
1441 if (prev_cyl_boundary > start)
1442 size = prev_cyl_boundary - start;
1443 else {
1444 warnx("ERROR: could not adjust partition to start on a head boundary\n\
1445 and end on a cylinder boundary.");
1446 return (0);
1447 }
1448
1449 /* Finally, commit any changes to partp and return. */
1450 if (start != partp->dp_start) {
1451 warnx("WARNING: adjusting start offset of partition to %u",
1452 (u_int)start);
1453 partp->dp_start = start;
1454 }
1455 if (size != partp->dp_size) {
1456 warnx("WARNING: adjusting size of partition to %u", (u_int)size);
1457 partp->dp_size = size;
1458 }
1459
1460 return (1);
1461 }
1462
1463 /*
1464 * Try figuring out the root device's canonical disk name.
1465 * The following choices are considered:
1466 * /dev/ad0s1a => /dev/ad0
1467 * /dev/da0a => /dev/da0
1468 * /dev/vinum/root => /dev/vinum/root
1469 * A ".eli" part is removed if it exists (see geli(8)).
1470 * A ".journal" ending is removed if it exists (see gjournal(8)).
1471 */
1472 static char *
get_rootdisk(void)1473 get_rootdisk(void)
1474 {
1475 struct statfs rootfs;
1476 regex_t re;
1477 #define NMATCHES 2
1478 regmatch_t rm[NMATCHES];
1479 char dev[PATH_MAX], *s;
1480 int rv;
1481
1482 if (statfs("/", &rootfs) == -1)
1483 err(1, "statfs(\"/\")");
1484
1485 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$",
1486 REG_EXTENDED)) != 0)
1487 errx(1, "regcomp() failed (%d)", rv);
1488 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev));
1489 if ((s = strstr(dev, ".eli")) != NULL)
1490 memmove(s, s+4, strlen(s + 4) + 1);
1491
1492 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0)
1493 errx(1,
1494 "mounted root fs resource doesn't match expectations (regexec returned %d)",
1495 rv);
1496 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
1497 errx(1, "out of memory");
1498 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
1499 rm[1].rm_eo - rm[1].rm_so);
1500 s[rm[1].rm_eo - rm[1].rm_so] = 0;
1501
1502 return s;
1503 }
1504