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 fprintf(stderr,
269 "WARNING: fdisk is deprecated and is not available in FreeBSD 15 or later.\n"
270 "Please use gpart instead.\n\n");
271
272 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1)
273 switch (c) {
274 case 'B':
275 B_flag = 1;
276 break;
277 case 'I':
278 I_flag = 1;
279 break;
280 case 'a':
281 a_flag = 1;
282 break;
283 case 'b':
284 b_flag = optarg;
285 break;
286 case 'f':
287 f_flag = optarg;
288 break;
289 case 'i':
290 i_flag = 1;
291 break;
292 case 'p':
293 print_config_flag = 1;
294 break;
295 case 'q':
296 q_flag = 1;
297 break;
298 case 's':
299 s_flag = 1;
300 break;
301 case 't':
302 t_flag = 1;
303 break;
304 case 'u':
305 u_flag = 1;
306 break;
307 case 'v':
308 v_flag = 1;
309 break;
310 case '1':
311 case '2':
312 case '3':
313 case '4':
314 partition = c - '0';
315 break;
316 default:
317 usage();
318 }
319 if (f_flag || i_flag)
320 u_flag = 1;
321 if (t_flag)
322 v_flag = 1;
323 argc -= optind;
324 argv += optind;
325
326 if (argc == 0) {
327 disk = get_rootdisk();
328 } else {
329 disk = g_device_path(argv[0]);
330 if (disk == NULL)
331 err(1, "unable to get correct path for %s", argv[0]);
332 }
333 if (open_disk(u_flag) < 0)
334 err(1, "cannot open disk %s", disk);
335
336 /* (abu)use mboot.bootinst to probe for the sector size */
337 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
338 err(1, "cannot allocate buffer to determine disk sector size");
339 if (read_disk(0, mboot.bootinst) == -1)
340 errx(1, "could not detect sector size");
341 free(mboot.bootinst);
342 mboot.bootinst = NULL;
343
344 if (print_config_flag) {
345 if (read_s0())
346 err(1, "read_s0");
347
348 printf("# %s\n", disk);
349 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors);
350
351 for (i = 0; i < NDOSPART; i++) {
352 partp = &mboot.parts[i];
353
354 if (partp->dp_start == 0 && partp->dp_size == 0)
355 continue;
356
357 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ,
358 (u_long)partp->dp_start, (u_long)partp->dp_size);
359
360 /* Fill flags for the partition. */
361 if (partp->dp_flag & 0x80)
362 printf("a %d\n", i + 1);
363 }
364 exit(0);
365 }
366 if (s_flag) {
367 if (read_s0())
368 err(1, "read_s0");
369 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
370 dos_sectors);
371 printf("Part %11s %11s Type Flags\n", "Start", "Size");
372 for (i = 0; i < NDOSPART; i++) {
373 partp = &mboot.parts[i];
374 if (partp->dp_start == 0 && partp->dp_size == 0)
375 continue;
376 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
377 (u_long) partp->dp_start,
378 (u_long) partp->dp_size, partp->dp_typ,
379 partp->dp_flag);
380 }
381 exit(0);
382 }
383
384 printf("******* Working on device %s *******\n",disk);
385
386 if (I_flag) {
387 if (read_s0())
388 warnx("Ignoring bad existing MBR.");
389 reset_boot();
390 partp = &mboot.parts[0];
391 partp->dp_typ = DOSPTYP_386BSD;
392 partp->dp_flag = ACTIVE;
393 partp->dp_start = dos_sectors;
394 partp->dp_size = rounddown(disksecs, dos_cylsecs) -
395 dos_sectors;
396 dos(partp);
397 if (v_flag)
398 print_s0();
399 if (!t_flag)
400 write_s0();
401 exit(0);
402 }
403 if (f_flag) {
404 if (read_s0() || i_flag)
405 reset_boot();
406 if (!read_config(f_flag))
407 exit(1);
408 if (v_flag)
409 print_s0();
410 if (!t_flag)
411 write_s0();
412 } else {
413 if(u_flag)
414 get_params_to_use();
415 else
416 print_params();
417
418 if (read_s0()) {
419 printf("Will replace existing bad MBR\n");
420 init_sector0(dos_sectors);
421 }
422
423 printf("Media sector size is %d\n", secsize);
424 printf("Warning: BIOS sector numbering starts with sector 1\n");
425 printf("Information from DOS bootblock is:\n");
426 if (partition == -1)
427 for (i = 1; i <= NDOSPART; i++)
428 change_part(i);
429 else
430 change_part(partition);
431
432 if (u_flag || a_flag)
433 change_active(partition);
434
435 if (B_flag)
436 change_code();
437
438 if (u_flag || a_flag || B_flag) {
439 if (!t_flag) {
440 printf("\nWe haven't changed the partition table yet. ");
441 printf("This is your last chance.\n");
442 }
443 print_s0();
444 if (!t_flag) {
445 if (ok("Should we write new partition table?"))
446 write_s0();
447 } else {
448 printf("\n-t flag specified -- partition table not written.\n");
449 }
450 }
451 }
452
453 exit(0);
454 }
455
456 static void
usage(void)457 usage(void)
458 {
459 fprintf(stderr, "%s%s",
460 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n",
461 " fdisk -f configfile [-itv] [disk]\n");
462 exit(1);
463 }
464
465 static void
print_s0(void)466 print_s0(void)
467 {
468 int i;
469
470 print_params();
471 printf("Information from DOS bootblock is:\n");
472 for (i = 1; i <= NDOSPART; i++) {
473 printf("%d: ", i);
474 print_part(&mboot.parts[i - 1]);
475 }
476 }
477
478 static struct dos_partition mtpart;
479
480 static void
print_part(const struct dos_partition * partp)481 print_part(const struct dos_partition *partp)
482 {
483 u_int64_t part_mb;
484
485 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
486 printf("<UNUSED>\n");
487 return;
488 }
489 /*
490 * Be careful not to overflow.
491 */
492 part_mb = partp->dp_size;
493 part_mb *= secsize;
494 part_mb /= (1024 * 1024);
495 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ,
496 get_type(partp->dp_typ));
497 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n",
498 (u_long)partp->dp_start,
499 (u_long)partp->dp_size,
500 (uintmax_t)part_mb,
501 partp->dp_flag,
502 partp->dp_flag == ACTIVE ? " (active)" : "");
503 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
504 ,DPCYL(partp->dp_scyl, partp->dp_ssect)
505 ,partp->dp_shd
506 ,DPSECT(partp->dp_ssect)
507 ,DPCYL(partp->dp_ecyl, partp->dp_esect)
508 ,partp->dp_ehd
509 ,DPSECT(partp->dp_esect));
510 }
511
512
513 static void
init_boot(void)514 init_boot(void)
515 {
516 const char *fname;
517 int fdesc, n;
518 struct stat sb;
519
520 fname = b_flag ? b_flag : "/boot/mbr";
521 if ((fdesc = open(fname, O_RDONLY)) == -1 ||
522 fstat(fdesc, &sb) == -1)
523 err(1, "%s", fname);
524 if (sb.st_size == 0)
525 errx(1, "%s is empty, must not be.", fname);
526 if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
527 errx(1, "%s: length must be a multiple of sector size", fname);
528 if (mboot.bootinst != NULL)
529 free(mboot.bootinst);
530 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
531 errx(1, "%s: unable to allocate read buffer", fname);
532 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
533 close(fdesc))
534 err(1, "%s", fname);
535 if (n != mboot.bootinst_size)
536 errx(1, "%s: short read", fname);
537 }
538
539
540 static void
init_sector0(unsigned long start)541 init_sector0(unsigned long start)
542 {
543 struct dos_partition *partp = &mboot.parts[0];
544
545 init_boot();
546
547 partp->dp_typ = DOSPTYP_386BSD;
548 partp->dp_flag = ACTIVE;
549 start = roundup(start, dos_sectors);
550 if(start == 0)
551 start = dos_sectors;
552 partp->dp_start = start;
553 partp->dp_size = rounddown(disksecs, dos_cylsecs) - start;
554
555 dos(partp);
556 }
557
558 static void
change_part(int i)559 change_part(int i)
560 {
561 struct dos_partition *partp = &mboot.parts[i - 1];
562
563 printf("The data for partition %d is:\n", i);
564 print_part(partp);
565
566 if (u_flag && ok("Do you want to change it?")) {
567 int tmp;
568
569 if (i_flag) {
570 bzero(partp, sizeof (*partp));
571 if (i == 1) {
572 init_sector0(1);
573 printf("\nThe static data for the slice 1 has been reinitialized to:\n");
574 print_part(partp);
575 }
576 }
577
578 do {
579 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255);
580 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS);
581 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS);
582 if (!sanitize_partition(partp)) {
583 warnx("ERROR: failed to adjust; setting sysid to 0");
584 partp->dp_typ = 0;
585 }
586
587 if (ok("Explicitly specify beg/end address ?"))
588 {
589 int tsec,tcyl,thd;
590 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
591 thd = partp->dp_shd;
592 tsec = DPSECT(partp->dp_ssect);
593 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
594 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS);
595 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS);
596 partp->dp_scyl = DOSCYL(tcyl);
597 partp->dp_ssect = DOSSECT(tsec,tcyl);
598 partp->dp_shd = thd;
599
600 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
601 thd = partp->dp_ehd;
602 tsec = DPSECT(partp->dp_esect);
603 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
604 Decimal("ending head", thd, tmp, NO_TRACK_HEADS);
605 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS);
606 partp->dp_ecyl = DOSCYL(tcyl);
607 partp->dp_esect = DOSSECT(tsec,tcyl);
608 partp->dp_ehd = thd;
609 } else
610 dos(partp);
611
612 print_part(partp);
613 } while (!ok("Are we happy with this entry?"));
614 }
615 }
616
617 static void
print_params(void)618 print_params(void)
619 {
620 printf("parameters extracted from in-core disklabel are:\n");
621 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
622 ,cyls,heads,sectors,cylsecs);
623 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
624 printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
625 printf("parameters to be used for BIOS calculations are:\n");
626 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
627 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
628 }
629
630 static void
change_active(int which)631 change_active(int which)
632 {
633 struct dos_partition *partp = &mboot.parts[0];
634 int active, i, new, tmp;
635
636 active = -1;
637 for (i = 0; i < NDOSPART; i++) {
638 if ((partp[i].dp_flag & ACTIVE) == 0)
639 continue;
640 printf("Partition %d is marked active\n", i + 1);
641 if (active == -1)
642 active = i + 1;
643 }
644 if (a_flag && which != -1)
645 active = which;
646 else if (active == -1)
647 active = 1;
648
649 if (!ok("Do you want to change the active partition?"))
650 return;
651 setactive:
652 do {
653 new = active;
654 Decimal("active partition", new, tmp, 0);
655 if (new < 1 || new > 4) {
656 printf("Active partition number must be in range 1-4."
657 " Try again.\n");
658 goto setactive;
659 }
660 active = new;
661 } while (!ok("Are you happy with this choice"));
662 for (i = 0; i < NDOSPART; i++)
663 partp[i].dp_flag = 0;
664 if (active > 0 && active <= NDOSPART)
665 partp[active-1].dp_flag = ACTIVE;
666 }
667
668 static void
change_code(void)669 change_code(void)
670 {
671 if (ok("Do you want to change the boot code?"))
672 init_boot();
673 }
674
675 void
get_params_to_use(void)676 get_params_to_use(void)
677 {
678 int tmp;
679 print_params();
680 if (ok("Do you want to change our idea of what BIOS thinks ?"))
681 {
682 do
683 {
684 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0);
685 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0);
686 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0);
687 dos_cylsecs = dos_heads * dos_sectors;
688 print_params();
689 }
690 while(!ok("Are you happy with this choice"));
691 }
692 }
693
694
695 /***********************************************\
696 * Change real numbers into strange dos numbers *
697 \***********************************************/
698 static void
dos(struct dos_partition * partp)699 dos(struct dos_partition *partp)
700 {
701 int cy, sec;
702 u_int32_t end;
703
704 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
705 memcpy(partp, &mtpart, sizeof(*partp));
706 return;
707 }
708
709 /* Start c/h/s. */
710 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
711 cy = partp->dp_start / dos_cylsecs;
712 sec = partp->dp_start % dos_sectors + 1;
713 partp->dp_scyl = DOSCYL(cy);
714 partp->dp_ssect = DOSSECT(sec, cy);
715
716 /* End c/h/s. */
717 end = partp->dp_start + partp->dp_size - 1;
718 partp->dp_ehd = end % dos_cylsecs / dos_sectors;
719 cy = end / dos_cylsecs;
720 sec = end % dos_sectors + 1;
721 partp->dp_ecyl = DOSCYL(cy);
722 partp->dp_esect = DOSSECT(sec, cy);
723 }
724
725 static int
open_disk(int flag)726 open_disk(int flag)
727 {
728 int rwmode;
729
730 /* Write mode if one of these flags are set. */
731 rwmode = (a_flag || I_flag || B_flag || flag);
732 fd = g_open(disk, rwmode);
733 /* If the mode fails, try read-only if we didn't. */
734 if (fd == -1 && errno == EPERM && rwmode)
735 fd = g_open(disk, 0);
736 if (fd == -1 && errno == ENXIO)
737 return -2;
738 if (fd == -1) {
739 warnx("can't open device %s", disk);
740 return -1;
741 }
742 if (get_params() == -1) {
743 warnx("can't get disk parameters on %s", disk);
744 return -1;
745 }
746 return fd;
747 }
748
749 static ssize_t
read_disk(off_t sector,void * buf)750 read_disk(off_t sector, void *buf)
751 {
752
753 lseek(fd, (sector * 512), 0);
754 if (secsize == 0)
755 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
756 secsize *= 2) {
757 /* try the read */
758 int size = read(fd, buf, secsize);
759 if (size == secsize)
760 /* it worked so return */
761 return secsize;
762 }
763 else
764 return read(fd, buf, secsize);
765
766 /* we failed to read at any of the sizes */
767 return -1;
768 }
769
770 static int
geom_class_available(const char * name)771 geom_class_available(const char *name)
772 {
773 struct gclass *class;
774 struct gmesh mesh;
775 int error;
776
777 error = geom_gettree(&mesh);
778 if (error != 0)
779 errc(1, error, "Cannot get GEOM tree");
780
781 LIST_FOREACH(class, &mesh.lg_class, lg_class) {
782 if (strcmp(class->lg_name, name) == 0) {
783 geom_deletetree(&mesh);
784 return (1);
785 }
786 }
787
788 geom_deletetree(&mesh);
789
790 return (0);
791 }
792
793 static int
write_disk(off_t sector,void * buf)794 write_disk(off_t sector, void *buf)
795 {
796 ssize_t wr;
797
798 /*
799 * Try to write MBR directly. This may help when disk
800 * is not in use.
801 * XXX: hardcoded sectorsize
802 */
803 wr = pwrite(fd, buf, secsize, (sector * 512));
804 if (wr == secsize)
805 return (0);
806
807 if (geom_class_available("PART") != 0)
808 warnx("Failed to write MBR. Try to use gpart(8).");
809 else
810 warnx("Failed to write sector zero");
811 return(EINVAL);
812 }
813
814 static int
get_params(void)815 get_params(void)
816 {
817 int error;
818 u_int u;
819 off_t o;
820
821 error = ioctl(fd, DIOCGFWSECTORS, &u);
822 if (error == 0)
823 sectors = dos_sectors = u;
824 else
825 sectors = dos_sectors = 63;
826
827 error = ioctl(fd, DIOCGFWHEADS, &u);
828 if (error == 0)
829 heads = dos_heads = u;
830 else
831 heads = dos_heads = 255;
832
833 dos_cylsecs = cylsecs = heads * sectors;
834 disksecs = cyls * heads * sectors;
835
836 u = g_sectorsize(fd);
837 if (u <= 0)
838 return (-1);
839
840 o = g_mediasize(fd);
841 if (o < 0)
842 return (-1);
843 if (o / u <= NO_DISK_SECTORS)
844 disksecs = o / u;
845 else
846 disksecs = NO_DISK_SECTORS;
847 cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
848
849 return (0);
850 }
851
852 static int
read_s0(void)853 read_s0(void)
854 {
855 int i;
856
857 mboot.bootinst_size = secsize;
858 if (mboot.bootinst != NULL)
859 free(mboot.bootinst);
860 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
861 warnx("unable to allocate buffer to read fdisk "
862 "partition table");
863 return -1;
864 }
865 if (read_disk(0, mboot.bootinst) == -1) {
866 warnx("can't read fdisk partition table");
867 return -1;
868 }
869 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
870 warnx("invalid fdisk partition table found");
871 /* So should we initialize things */
872 return -1;
873 }
874 for (i = 0; i < NDOSPART; i++)
875 dos_partition_dec(
876 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
877 &mboot.parts[i]);
878 return 0;
879 }
880
881 static int
write_s0(void)882 write_s0(void)
883 {
884 int sector, i;
885
886 if (iotest) {
887 print_s0();
888 return 0;
889 }
890 for(i = 0; i < NDOSPART; i++)
891 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
892 &mboot.parts[i]);
893 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
894 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
895 if (write_disk(sector,
896 &mboot.bootinst[sector * secsize]) == -1) {
897 warn("can't write fdisk partition table");
898 return -1;
899 }
900 return(0);
901 }
902
903
904 static int
ok(const char * str)905 ok(const char *str)
906 {
907 printf("%s [n] ", str);
908 fflush(stdout);
909 if (fgets(lbuf, LBUF, stdin) == NULL)
910 exit(1);
911 lbuf[strlen(lbuf)-1] = 0;
912
913 if (*lbuf &&
914 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
915 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
916 return 1;
917 else
918 return 0;
919 }
920
921 static int
decimal(const char * str,int * num,int deflt,uint32_t maxval)922 decimal(const char *str, int *num, int deflt, uint32_t maxval)
923 {
924 long long acc;
925 int c;
926 char *cp;
927
928 while (1) {
929 acc = 0;
930 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
931 fflush(stdout);
932 if (fgets(lbuf, LBUF, stdin) == NULL)
933 exit(1);
934 lbuf[strlen(lbuf)-1] = 0;
935
936 if (!*lbuf)
937 return 0;
938
939 cp = lbuf;
940 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
941 if (!c)
942 return 0;
943 while ((c = *cp++)) {
944 if (c <= '9' && c >= '0') {
945 if (acc <= maxval || maxval == 0)
946 acc = acc * 10 + c - '0';
947 } else
948 break;
949 }
950 if (c == ' ' || c == '\t')
951 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
952 if (!c) {
953 if (maxval > 0 && acc > maxval) {
954 acc = maxval;
955 printf("%s exceeds maximum value allowed for "
956 "this field. The value has been reduced "
957 "to %lld\n", lbuf, acc);
958 }
959 *num = acc;
960 return 1;
961 } else
962 printf("%s is an invalid decimal number. Try again.\n",
963 lbuf);
964 }
965 }
966
967
968 static void
parse_config_line(char * line,CMD * command)969 parse_config_line(char *line, CMD *command)
970 {
971 char *cp, *end;
972
973 cp = line;
974 while (1) {
975 memset(command, 0, sizeof(*command));
976
977 while (isspace(*cp)) ++cp;
978 if (*cp == '\0' || *cp == '#')
979 break;
980 command->cmd = *cp++;
981
982 /*
983 * Parse args
984 */
985 while (1) {
986 while (isspace(*cp)) ++cp;
987 if (*cp == '\0')
988 break; /* eol */
989 if (*cp == '#')
990 break; /* found comment */
991 if (isalpha(*cp))
992 command->args[command->n_args].argtype = *cp++;
993 end = NULL;
994 command->args[command->n_args].arg_val = strtoul(cp, &end, 0);
995 if (cp == end || (!isspace(*end) && *end != '\0')) {
996 char ch;
997 end = cp;
998 while (!isspace(*end) && *end != '\0') ++end;
999 ch = *end; *end = '\0';
1000 command->args[command->n_args].arg_str = strdup(cp);
1001 *end = ch;
1002 } else
1003 command->args[command->n_args].arg_str = NULL;
1004 cp = end;
1005 command->n_args++;
1006 }
1007 break;
1008 }
1009 }
1010
1011
1012 static int
process_geometry(CMD * command)1013 process_geometry(CMD *command)
1014 {
1015 int status = 1, i;
1016
1017 while (1) {
1018 geom_processed = 1;
1019 if (part_processed) {
1020 warnx(
1021 "ERROR line %d: the geometry specification line must occur before\n\
1022 all partition specifications",
1023 current_line_number);
1024 status = 0;
1025 break;
1026 }
1027 if (command->n_args != 3) {
1028 warnx("ERROR line %d: incorrect number of geometry args",
1029 current_line_number);
1030 status = 0;
1031 break;
1032 }
1033 dos_cyls = 0;
1034 dos_heads = 0;
1035 dos_sectors = 0;
1036 for (i = 0; i < 3; ++i) {
1037 switch (command->args[i].argtype) {
1038 case 'c':
1039 dos_cyls = command->args[i].arg_val;
1040 break;
1041 case 'h':
1042 dos_heads = command->args[i].arg_val;
1043 break;
1044 case 's':
1045 dos_sectors = command->args[i].arg_val;
1046 break;
1047 default:
1048 warnx(
1049 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
1050 current_line_number, command->args[i].argtype,
1051 command->args[i].argtype);
1052 status = 0;
1053 break;
1054 }
1055 }
1056 if (status == 0)
1057 break;
1058
1059 dos_cylsecs = dos_heads * dos_sectors;
1060
1061 /*
1062 * Do sanity checks on parameter values
1063 */
1064 if (dos_cyls == 0) {
1065 warnx("ERROR line %d: number of cylinders not specified",
1066 current_line_number);
1067 status = 0;
1068 }
1069 if (dos_cyls > 1024) {
1070 warnx(
1071 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\
1072 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
1073 is dedicated to FreeBSD)",
1074 current_line_number, dos_cyls);
1075 }
1076
1077 if (dos_heads == 0) {
1078 warnx("ERROR line %d: number of heads not specified",
1079 current_line_number);
1080 status = 0;
1081 } else if (dos_heads > 256) {
1082 warnx("ERROR line %d: number of heads must be within (1-256)",
1083 current_line_number);
1084 status = 0;
1085 }
1086
1087 if (dos_sectors == 0) {
1088 warnx("ERROR line %d: number of sectors not specified",
1089 current_line_number);
1090 status = 0;
1091 } else if (dos_sectors > 63) {
1092 warnx("ERROR line %d: number of sectors must be within (1-63)",
1093 current_line_number);
1094 status = 0;
1095 }
1096
1097 break;
1098 }
1099 return (status);
1100 }
1101
1102 static u_int32_t
str2sectors(const char * str)1103 str2sectors(const char *str)
1104 {
1105 char *end;
1106 unsigned long val;
1107
1108 val = strtoul(str, &end, 0);
1109 if (str == end || *end == '\0') {
1110 warnx("ERROR line %d: unexpected size: \'%s\'",
1111 current_line_number, str);
1112 return NO_DISK_SECTORS;
1113 }
1114
1115 if (*end == 'K')
1116 val *= 1024UL / secsize;
1117 else if (*end == 'M')
1118 val *= 1024UL * 1024UL / secsize;
1119 else if (*end == 'G')
1120 val *= 1024UL * 1024UL * 1024UL / secsize;
1121 else {
1122 warnx("ERROR line %d: unexpected modifier: %c "
1123 "(not K/M/G)", current_line_number, *end);
1124 return NO_DISK_SECTORS;
1125 }
1126
1127 return val;
1128 }
1129
1130 static int
process_partition(CMD * command)1131 process_partition(CMD *command)
1132 {
1133 int status = 0, partition;
1134 u_int32_t prev_head_boundary, prev_cyl_boundary;
1135 u_int32_t adj_size, max_end;
1136 struct dos_partition *partp;
1137
1138 while (1) {
1139 part_processed = 1;
1140 if (command->n_args != 4) {
1141 warnx("ERROR line %d: incorrect number of partition args",
1142 current_line_number);
1143 break;
1144 }
1145 partition = command->args[0].arg_val;
1146 if (partition < 1 || partition > 4) {
1147 warnx("ERROR line %d: invalid partition number %d",
1148 current_line_number, partition);
1149 break;
1150 }
1151 partp = &mboot.parts[partition - 1];
1152 bzero(partp, sizeof (*partp));
1153 partp->dp_typ = command->args[1].arg_val;
1154 if (command->args[2].arg_str != NULL) {
1155 if (strcmp(command->args[2].arg_str, "*") == 0) {
1156 int i;
1157 partp->dp_start = dos_sectors;
1158 for (i = 1; i < partition; i++) {
1159 struct dos_partition *prev_partp;
1160 prev_partp = ((struct dos_partition *)
1161 &mboot.parts) + i - 1;
1162 if (prev_partp->dp_typ != 0)
1163 partp->dp_start = prev_partp->dp_start +
1164 prev_partp->dp_size;
1165 }
1166 if (partp->dp_start % dos_sectors != 0) {
1167 prev_head_boundary = rounddown(partp->dp_start,
1168 dos_sectors);
1169 partp->dp_start = prev_head_boundary +
1170 dos_sectors;
1171 }
1172 } else {
1173 partp->dp_start = str2sectors(command->args[2].arg_str);
1174 if (partp->dp_start == NO_DISK_SECTORS)
1175 break;
1176 }
1177 } else
1178 partp->dp_start = command->args[2].arg_val;
1179
1180 if (command->args[3].arg_str != NULL) {
1181 if (strcmp(command->args[3].arg_str, "*") == 0)
1182 partp->dp_size = rounddown(disksecs, dos_cylsecs) -
1183 partp->dp_start;
1184 else {
1185 partp->dp_size = str2sectors(command->args[3].arg_str);
1186 if (partp->dp_size == NO_DISK_SECTORS)
1187 break;
1188 }
1189 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size,
1190 dos_cylsecs);
1191 if (prev_cyl_boundary > partp->dp_start)
1192 partp->dp_size = prev_cyl_boundary - partp->dp_start;
1193 } else
1194 partp->dp_size = command->args[3].arg_val;
1195
1196 max_end = partp->dp_start + partp->dp_size;
1197
1198 if (partp->dp_typ == 0) {
1199 /*
1200 * Get out, the partition is marked as unused.
1201 */
1202 /*
1203 * Insure that it's unused.
1204 */
1205 bzero(partp, sizeof(*partp));
1206 status = 1;
1207 break;
1208 }
1209
1210 /*
1211 * Adjust start upwards, if necessary, to fall on a head boundary.
1212 */
1213 if (partp->dp_start % dos_sectors != 0) {
1214 prev_head_boundary = rounddown(partp->dp_start, dos_sectors);
1215 if (max_end < dos_sectors ||
1216 prev_head_boundary > max_end - dos_sectors) {
1217 /*
1218 * Can't go past end of partition
1219 */
1220 warnx(
1221 "ERROR line %d: unable to adjust start of partition %d to fall on\n\
1222 a head boundary",
1223 current_line_number, partition);
1224 break;
1225 }
1226 warnx(
1227 "WARNING: adjusting start offset of partition %d\n\
1228 from %u to %u, to fall on a head boundary",
1229 partition, (u_int)partp->dp_start,
1230 (u_int)(prev_head_boundary + dos_sectors));
1231 partp->dp_start = prev_head_boundary + dos_sectors;
1232 }
1233
1234 /*
1235 * Adjust size downwards, if necessary, to fall on a cylinder
1236 * boundary.
1237 */
1238 prev_cyl_boundary = rounddown(partp->dp_start + partp->dp_size,
1239 dos_cylsecs);
1240 if (prev_cyl_boundary > partp->dp_start)
1241 adj_size = prev_cyl_boundary - partp->dp_start;
1242 else {
1243 warnx(
1244 "ERROR: could not adjust partition to start on a head boundary\n\
1245 and end on a cylinder boundary.");
1246 return (0);
1247 }
1248 if (adj_size != partp->dp_size) {
1249 warnx(
1250 "WARNING: adjusting size of partition %d from %u to %u\n\
1251 to end on a cylinder boundary",
1252 partition, (u_int)partp->dp_size, (u_int)adj_size);
1253 partp->dp_size = adj_size;
1254 }
1255 if (partp->dp_size == 0) {
1256 warnx("ERROR line %d: size of partition %d is zero",
1257 current_line_number, partition);
1258 break;
1259 }
1260
1261 dos(partp);
1262 status = 1;
1263 break;
1264 }
1265 return (status);
1266 }
1267
1268
1269 static int
process_active(CMD * command)1270 process_active(CMD *command)
1271 {
1272 int status = 0, partition, i;
1273 struct dos_partition *partp;
1274
1275 while (1) {
1276 active_processed = 1;
1277 if (command->n_args != 1) {
1278 warnx("ERROR line %d: incorrect number of active args",
1279 current_line_number);
1280 status = 0;
1281 break;
1282 }
1283 partition = command->args[0].arg_val;
1284 if (partition < 1 || partition > 4) {
1285 warnx("ERROR line %d: invalid partition number %d",
1286 current_line_number, partition);
1287 break;
1288 }
1289 /*
1290 * Reset active partition
1291 */
1292 partp = mboot.parts;
1293 for (i = 0; i < NDOSPART; i++)
1294 partp[i].dp_flag = 0;
1295 partp[partition-1].dp_flag = ACTIVE;
1296
1297 status = 1;
1298 break;
1299 }
1300 return (status);
1301 }
1302
1303
1304 static int
process_line(char * line)1305 process_line(char *line)
1306 {
1307 CMD command;
1308 int status = 1;
1309
1310 while (1) {
1311 parse_config_line(line, &command);
1312 switch (command.cmd) {
1313 case 0:
1314 /*
1315 * Comment or blank line
1316 */
1317 break;
1318 case 'g':
1319 /*
1320 * Set geometry
1321 */
1322 status = process_geometry(&command);
1323 break;
1324 case 'p':
1325 status = process_partition(&command);
1326 break;
1327 case 'a':
1328 status = process_active(&command);
1329 break;
1330 default:
1331 status = 0;
1332 break;
1333 }
1334 break;
1335 }
1336 return (status);
1337 }
1338
1339
1340 static int
read_config(char * config_file)1341 read_config(char *config_file)
1342 {
1343 FILE *fp = NULL;
1344 int status = 1;
1345 char buf[1010];
1346
1347 while (1) {
1348 if (strcmp(config_file, "-") != 0) {
1349 /*
1350 * We're not reading from stdin
1351 */
1352 if ((fp = fopen(config_file, "r")) == NULL) {
1353 status = 0;
1354 break;
1355 }
1356 } else {
1357 fp = stdin;
1358 }
1359 current_line_number = 0;
1360 while (!feof(fp)) {
1361 if (fgets(buf, sizeof(buf), fp) == NULL)
1362 break;
1363 ++current_line_number;
1364 status = process_line(buf);
1365 if (status == 0)
1366 break;
1367 }
1368 break;
1369 }
1370 if (fp) {
1371 /*
1372 * It doesn't matter if we're reading from stdin, as we've reached EOF
1373 */
1374 fclose(fp);
1375 }
1376 return (status);
1377 }
1378
1379
1380 static void
reset_boot(void)1381 reset_boot(void)
1382 {
1383 int i;
1384 struct dos_partition *partp;
1385
1386 init_boot();
1387 for (i = 0; i < 4; ++i) {
1388 partp = &mboot.parts[i];
1389 bzero(partp, sizeof(*partp));
1390 }
1391 }
1392
1393 static int
sanitize_partition(struct dos_partition * partp)1394 sanitize_partition(struct dos_partition *partp)
1395 {
1396 u_int32_t prev_head_boundary, prev_cyl_boundary;
1397 u_int32_t max_end, size, start;
1398
1399 start = partp->dp_start;
1400 size = partp->dp_size;
1401 max_end = start + size;
1402 /* Only allow a zero size if the partition is being marked unused. */
1403 if (size == 0) {
1404 if (start == 0 && partp->dp_typ == 0)
1405 return (1);
1406 warnx("ERROR: size of partition is zero");
1407 return (0);
1408 }
1409 /* Return if no adjustment is necessary. */
1410 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
1411 return (1);
1412
1413 if (start == 0) {
1414 warnx("WARNING: partition overlaps with partition table");
1415 if (ok("Correct this automatically?"))
1416 start = dos_sectors;
1417 }
1418 if (start % dos_sectors != 0)
1419 warnx("WARNING: partition does not start on a head boundary");
1420 if ((start +size) % dos_sectors != 0)
1421 warnx("WARNING: partition does not end on a cylinder boundary");
1422 warnx("WARNING: this may confuse the BIOS or some operating systems");
1423 if (!ok("Correct this automatically?"))
1424 return (1);
1425
1426 /*
1427 * Adjust start upwards, if necessary, to fall on a head boundary.
1428 */
1429 if (start % dos_sectors != 0) {
1430 prev_head_boundary = rounddown(start, dos_sectors);
1431 if (max_end < dos_sectors ||
1432 prev_head_boundary >= max_end - dos_sectors) {
1433 /*
1434 * Can't go past end of partition
1435 */
1436 warnx(
1437 "ERROR: unable to adjust start of partition to fall on a head boundary");
1438 return (0);
1439 }
1440 start = prev_head_boundary + dos_sectors;
1441 }
1442
1443 /*
1444 * Adjust size downwards, if necessary, to fall on a cylinder
1445 * boundary.
1446 */
1447 prev_cyl_boundary = rounddown(start + size, dos_cylsecs);
1448 if (prev_cyl_boundary > start)
1449 size = prev_cyl_boundary - start;
1450 else {
1451 warnx("ERROR: could not adjust partition to start on a head boundary\n\
1452 and end on a cylinder boundary.");
1453 return (0);
1454 }
1455
1456 /* Finally, commit any changes to partp and return. */
1457 if (start != partp->dp_start) {
1458 warnx("WARNING: adjusting start offset of partition to %u",
1459 (u_int)start);
1460 partp->dp_start = start;
1461 }
1462 if (size != partp->dp_size) {
1463 warnx("WARNING: adjusting size of partition to %u", (u_int)size);
1464 partp->dp_size = size;
1465 }
1466
1467 return (1);
1468 }
1469
1470 /*
1471 * Try figuring out the root device's canonical disk name.
1472 * The following choices are considered:
1473 * /dev/ad0s1a => /dev/ad0
1474 * /dev/da0a => /dev/da0
1475 * /dev/vinum/root => /dev/vinum/root
1476 * A ".eli" part is removed if it exists (see geli(8)).
1477 * A ".journal" ending is removed if it exists (see gjournal(8)).
1478 */
1479 static char *
get_rootdisk(void)1480 get_rootdisk(void)
1481 {
1482 struct statfs rootfs;
1483 regex_t re;
1484 #define NMATCHES 2
1485 regmatch_t rm[NMATCHES];
1486 char dev[PATH_MAX], *s;
1487 int rv;
1488
1489 if (statfs("/", &rootfs) == -1)
1490 err(1, "statfs(\"/\")");
1491
1492 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$",
1493 REG_EXTENDED)) != 0)
1494 errx(1, "regcomp() failed (%d)", rv);
1495 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev));
1496 if ((s = strstr(dev, ".eli")) != NULL)
1497 memmove(s, s+4, strlen(s + 4) + 1);
1498
1499 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0)
1500 errx(1,
1501 "mounted root fs resource doesn't match expectations (regexec returned %d)",
1502 rv);
1503 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
1504 errx(1, "out of memory");
1505 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
1506 rm[1].rm_eo - rm[1].rm_so);
1507 s[rm[1].rm_eo - rm[1].rm_so] = 0;
1508
1509 return s;
1510 }
1511