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