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 __FBSDID("$FreeBSD$"); 29 30 #include <sys/disk.h> 31 #include <sys/disklabel.h> 32 #include <sys/diskmbr.h> 33 #include <sys/endian.h> 34 #include <sys/param.h> 35 #include <sys/stat.h> 36 #include <sys/mount.h> 37 #include <ctype.h> 38 #include <fcntl.h> 39 #include <err.h> 40 #include <errno.h> 41 #include <libgeom.h> 42 #include <paths.h> 43 #include <regex.h> 44 #include <stdint.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 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 RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 71 72 #define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 73 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 74 static int secsize = 0; /* the sensed sector size */ 75 76 static char *disk; 77 78 static int cyls, sectors, heads, cylsecs, disksecs; 79 80 struct mboot { 81 unsigned char *bootinst; /* boot code */ 82 off_t bootinst_size; 83 struct dos_partition parts[NDOSPART]; 84 }; 85 86 static struct mboot mboot; 87 static int fd; 88 89 #define ACTIVE 0x80 90 91 static uint dos_cyls; 92 static uint dos_heads; 93 static uint dos_sectors; 94 static uint dos_cylsecs; 95 96 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 97 #define DOSCYL(c) (c & 0xff) 98 99 #define MAX_ARGS 10 100 101 static int current_line_number; 102 103 static int geom_processed = 0; 104 static int part_processed = 0; 105 static int active_processed = 0; 106 107 typedef struct cmd { 108 char cmd; 109 int n_args; 110 struct arg { 111 char argtype; 112 unsigned long arg_val; 113 char * arg_str; 114 } args[MAX_ARGS]; 115 } CMD; 116 117 static int B_flag = 0; /* replace boot code */ 118 static int I_flag = 0; /* use entire disk for FreeBSD */ 119 static int a_flag = 0; /* set active partition */ 120 static char *b_flag = NULL; /* path to boot code */ 121 static int i_flag = 0; /* replace partition data */ 122 static int q_flag = 0; /* Be quiet */ 123 static int u_flag = 0; /* update partition data */ 124 static int s_flag = 0; /* Print a summary and exit */ 125 static int t_flag = 0; /* test only */ 126 static char *f_flag = NULL; /* Read config info from file */ 127 static int v_flag = 0; /* Be verbose */ 128 static int print_config_flag = 0; 129 130 /* 131 * A list of partition types, probably outdated. 132 */ 133 static const char *const part_types[256] = { 134 [0x00] = "unused", 135 [0x01] = "Primary DOS with 12 bit FAT", 136 [0x02] = "XENIX / file system", 137 [0x03] = "XENIX /usr file system", 138 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)", 139 [0x05] = "Extended DOS", 140 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)", 141 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX", 142 [0x08] = "AIX file system or SplitDrive", 143 [0x09] = "AIX boot partition or Coherent", 144 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap", 145 [0x0B] = "DOS or Windows 95 with 32 bit FAT", 146 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)", 147 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)", 148 [0x0F] = "Extended DOS (LBA)", 149 [0x10] = "OPUS", 150 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT", 151 [0x12] = "Compaq diagnostics", 152 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)", 153 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)", 154 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)", 155 [0x18] = "AST Windows swapfile", 156 [0x1b] = "ASUS Recovery partition (NTFS)", 157 [0x24] = "NEC DOS", 158 [0x3C] = "PartitionMagic recovery", 159 [0x39] = "plan9", 160 [0x40] = "VENIX 286", 161 [0x41] = "Linux/MINIX (sharing disk with DRDOS)", 162 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)", 163 [0x43] = "Linux native (sharing disk with DRDOS)", 164 [0x4D] = "QNX 4.2 Primary", 165 [0x4E] = "QNX 4.2 Secondary", 166 [0x4F] = "QNX 4.2 Tertiary", 167 [0x50] = "DM (disk manager)", 168 [0x51] = "DM6 Aux1 (or Novell)", 169 [0x52] = "CP/M or Microport SysV/AT", 170 [0x53] = "DM6 Aux3", 171 [0x54] = "DM6", 172 [0x55] = "EZ-Drive (disk manager)", 173 [0x56] = "Golden Bow (disk manager)", 174 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */ 175 [0x61] = "SpeedStor", 176 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach", 177 [0x64] = "Novell Netware/286 2.xx", 178 [0x65] = "Novell Netware/386 3.xx", 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 [0xFE] = "SpeedStor >1024 cyl. or LANstep", 222 [0xFF] = "Xenix bad blocks table", 223 }; 224 225 static const char * 226 get_type(int t) 227 { 228 const char *ret; 229 230 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL; 231 return ret ? ret : "unknown"; 232 } 233 234 235 static void print_s0(void); 236 static void print_part(const struct dos_partition *); 237 static void init_sector0(unsigned long start); 238 static void init_boot(void); 239 static void change_part(int i); 240 static void print_params(void); 241 static void change_active(int which); 242 static void change_code(void); 243 static void get_params_to_use(void); 244 static char *get_rootdisk(void); 245 static void dos(struct dos_partition *partp); 246 static int open_disk(int flag); 247 static ssize_t read_disk(off_t sector, void *buf); 248 static int write_disk(off_t sector, void *buf); 249 static int get_params(void); 250 static int read_s0(void); 251 static int write_s0(void); 252 static int ok(const char *str); 253 static int decimal(const char *str, int *num, int deflt, uint32_t maxval); 254 static int read_config(char *config_file); 255 static void reset_boot(void); 256 static int sanitize_partition(struct dos_partition *); 257 static void usage(void); 258 259 int 260 main(int argc, char *argv[]) 261 { 262 int c, i; 263 int partition = -1; 264 struct dos_partition *partp; 265 266 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 267 switch (c) { 268 case 'B': 269 B_flag = 1; 270 break; 271 case 'I': 272 I_flag = 1; 273 break; 274 case 'a': 275 a_flag = 1; 276 break; 277 case 'b': 278 b_flag = optarg; 279 break; 280 case 'f': 281 f_flag = optarg; 282 break; 283 case 'i': 284 i_flag = 1; 285 break; 286 case 'p': 287 print_config_flag = 1; 288 break; 289 case 'q': 290 q_flag = 1; 291 break; 292 case 's': 293 s_flag = 1; 294 break; 295 case 't': 296 t_flag = 1; 297 break; 298 case 'u': 299 u_flag = 1; 300 break; 301 case 'v': 302 v_flag = 1; 303 break; 304 case '1': 305 case '2': 306 case '3': 307 case '4': 308 partition = c - '0'; 309 break; 310 default: 311 usage(); 312 } 313 if (f_flag || i_flag) 314 u_flag = 1; 315 if (t_flag) 316 v_flag = 1; 317 argc -= optind; 318 argv += optind; 319 320 if (argc == 0) { 321 disk = get_rootdisk(); 322 } else { 323 disk = g_device_path(argv[0]); 324 if (disk == NULL) 325 err(1, "unable to get correct path for %s", argv[0]); 326 } 327 if (open_disk(u_flag) < 0) 328 err(1, "cannot open disk %s", disk); 329 330 /* (abu)use mboot.bootinst to probe for the sector size */ 331 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 332 err(1, "cannot allocate buffer to determine disk sector size"); 333 if (read_disk(0, mboot.bootinst) == -1) 334 errx(1, "could not detect sector size"); 335 free(mboot.bootinst); 336 mboot.bootinst = NULL; 337 338 if (print_config_flag) { 339 if (read_s0()) 340 err(1, "read_s0"); 341 342 printf("# %s\n", disk); 343 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 344 345 for (i = 0; i < NDOSPART; i++) { 346 partp = &mboot.parts[i]; 347 348 if (partp->dp_start == 0 && partp->dp_size == 0) 349 continue; 350 351 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 352 (u_long)partp->dp_start, (u_long)partp->dp_size); 353 354 /* Fill flags for the partition. */ 355 if (partp->dp_flag & 0x80) 356 printf("a %d\n", i + 1); 357 } 358 exit(0); 359 } 360 if (s_flag) { 361 if (read_s0()) 362 err(1, "read_s0"); 363 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 364 dos_sectors); 365 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 366 for (i = 0; i < NDOSPART; i++) { 367 partp = &mboot.parts[i]; 368 if (partp->dp_start == 0 && partp->dp_size == 0) 369 continue; 370 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 371 (u_long) partp->dp_start, 372 (u_long) partp->dp_size, partp->dp_typ, 373 partp->dp_flag); 374 } 375 exit(0); 376 } 377 378 printf("******* Working on device %s *******\n",disk); 379 380 if (I_flag) { 381 read_s0(); 382 reset_boot(); 383 partp = &mboot.parts[0]; 384 partp->dp_typ = DOSPTYP_386BSD; 385 partp->dp_flag = ACTIVE; 386 partp->dp_start = dos_sectors; 387 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 388 dos_sectors; 389 dos(partp); 390 if (v_flag) 391 print_s0(); 392 if (!t_flag) 393 write_s0(); 394 exit(0); 395 } 396 if (f_flag) { 397 if (read_s0() || i_flag) 398 reset_boot(); 399 if (!read_config(f_flag)) 400 exit(1); 401 if (v_flag) 402 print_s0(); 403 if (!t_flag) 404 write_s0(); 405 } else { 406 if(u_flag) 407 get_params_to_use(); 408 else 409 print_params(); 410 411 if (read_s0()) 412 init_sector0(dos_sectors); 413 414 printf("Media sector size is %d\n", secsize); 415 printf("Warning: BIOS sector numbering starts with sector 1\n"); 416 printf("Information from DOS bootblock is:\n"); 417 if (partition == -1) 418 for (i = 1; i <= NDOSPART; i++) 419 change_part(i); 420 else 421 change_part(partition); 422 423 if (u_flag || a_flag) 424 change_active(partition); 425 426 if (B_flag) 427 change_code(); 428 429 if (u_flag || a_flag || B_flag) { 430 if (!t_flag) { 431 printf("\nWe haven't changed the partition table yet. "); 432 printf("This is your last chance.\n"); 433 } 434 print_s0(); 435 if (!t_flag) { 436 if (ok("Should we write new partition table?")) 437 write_s0(); 438 } else { 439 printf("\n-t flag specified -- partition table not written.\n"); 440 } 441 } 442 } 443 444 exit(0); 445 } 446 447 static void 448 usage() 449 { 450 fprintf(stderr, "%s%s", 451 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 452 " fdisk -f configfile [-itv] [disk]\n"); 453 exit(1); 454 } 455 456 static void 457 print_s0(void) 458 { 459 int i; 460 461 print_params(); 462 printf("Information from DOS bootblock is:\n"); 463 for (i = 1; i <= NDOSPART; i++) { 464 printf("%d: ", i); 465 print_part(&mboot.parts[i - 1]); 466 } 467 } 468 469 static struct dos_partition mtpart; 470 471 static void 472 print_part(const struct dos_partition *partp) 473 { 474 u_int64_t part_mb; 475 476 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 477 printf("<UNUSED>\n"); 478 return; 479 } 480 /* 481 * Be careful not to overflow. 482 */ 483 part_mb = partp->dp_size; 484 part_mb *= secsize; 485 part_mb /= (1024 * 1024); 486 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 487 get_type(partp->dp_typ)); 488 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 489 (u_long)partp->dp_start, 490 (u_long)partp->dp_size, 491 (uintmax_t)part_mb, 492 partp->dp_flag, 493 partp->dp_flag == ACTIVE ? " (active)" : ""); 494 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 495 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 496 ,partp->dp_shd 497 ,DPSECT(partp->dp_ssect) 498 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 499 ,partp->dp_ehd 500 ,DPSECT(partp->dp_esect)); 501 } 502 503 504 static void 505 init_boot(void) 506 { 507 #ifndef __ia64__ 508 const char *fname; 509 int fdesc, n; 510 struct stat sb; 511 512 fname = b_flag ? b_flag : "/boot/mbr"; 513 if ((fdesc = open(fname, O_RDONLY)) == -1 || 514 fstat(fdesc, &sb) == -1) 515 err(1, "%s", fname); 516 if (sb.st_size == 0) 517 errx(1, "%s is empty, must not be.", fname); 518 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 519 errx(1, "%s: length must be a multiple of sector size", fname); 520 if (mboot.bootinst != NULL) 521 free(mboot.bootinst); 522 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 523 errx(1, "%s: unable to allocate read buffer", fname); 524 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 525 close(fdesc)) 526 err(1, "%s", fname); 527 if (n != mboot.bootinst_size) 528 errx(1, "%s: short read", fname); 529 #else 530 if (mboot.bootinst != NULL) 531 free(mboot.bootinst); 532 mboot.bootinst_size = secsize; 533 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 534 errx(1, "unable to allocate boot block buffer"); 535 memset(mboot.bootinst, 0, mboot.bootinst_size); 536 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 537 #endif 538 } 539 540 541 static void 542 init_sector0(unsigned long start) 543 { 544 struct dos_partition *partp = &mboot.parts[0]; 545 546 init_boot(); 547 548 partp->dp_typ = DOSPTYP_386BSD; 549 partp->dp_flag = ACTIVE; 550 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 551 if(start == 0) 552 start = dos_sectors; 553 partp->dp_start = start; 554 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 555 556 dos(partp); 557 } 558 559 static void 560 change_part(int i) 561 { 562 struct dos_partition *partp = &mboot.parts[i - 1]; 563 564 printf("The data for partition %d is:\n", i); 565 print_part(partp); 566 567 if (u_flag && ok("Do you want to change it?")) { 568 int tmp; 569 570 if (i_flag) { 571 bzero(partp, sizeof (*partp)); 572 if (i == 1) { 573 init_sector0(1); 574 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 575 print_part(partp); 576 } 577 } 578 579 do { 580 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); 581 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); 582 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); 583 if (!sanitize_partition(partp)) { 584 warnx("ERROR: failed to adjust; setting sysid to 0"); 585 partp->dp_typ = 0; 586 } 587 588 if (ok("Explicitly specify beg/end address ?")) 589 { 590 int tsec,tcyl,thd; 591 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 592 thd = partp->dp_shd; 593 tsec = DPSECT(partp->dp_ssect); 594 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 595 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); 596 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); 597 partp->dp_scyl = DOSCYL(tcyl); 598 partp->dp_ssect = DOSSECT(tsec,tcyl); 599 partp->dp_shd = thd; 600 601 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 602 thd = partp->dp_ehd; 603 tsec = DPSECT(partp->dp_esect); 604 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 605 Decimal("ending head", thd, tmp, NO_TRACK_HEADS); 606 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); 607 partp->dp_ecyl = DOSCYL(tcyl); 608 partp->dp_esect = DOSSECT(tsec,tcyl); 609 partp->dp_ehd = thd; 610 } else 611 dos(partp); 612 613 print_part(partp); 614 } while (!ok("Are we happy with this entry?")); 615 } 616 } 617 618 static void 619 print_params() 620 { 621 printf("parameters extracted from in-core disklabel are:\n"); 622 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 623 ,cyls,heads,sectors,cylsecs); 624 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 625 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 626 printf("parameters to be used for BIOS calculations are:\n"); 627 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 628 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 629 } 630 631 static void 632 change_active(int which) 633 { 634 struct dos_partition *partp = &mboot.parts[0]; 635 int active, i, new, tmp; 636 637 active = -1; 638 for (i = 0; i < NDOSPART; i++) { 639 if ((partp[i].dp_flag & ACTIVE) == 0) 640 continue; 641 printf("Partition %d is marked active\n", i + 1); 642 if (active == -1) 643 active = i + 1; 644 } 645 if (a_flag && which != -1) 646 active = which; 647 else if (active == -1) 648 active = 1; 649 650 if (!ok("Do you want to change the active partition?")) 651 return; 652 setactive: 653 do { 654 new = active; 655 Decimal("active partition", new, tmp, 0); 656 if (new < 1 || new > 4) { 657 printf("Active partition number must be in range 1-4." 658 " Try again.\n"); 659 goto setactive; 660 } 661 active = new; 662 } while (!ok("Are you happy with this choice")); 663 for (i = 0; i < NDOSPART; i++) 664 partp[i].dp_flag = 0; 665 if (active > 0 && active <= NDOSPART) 666 partp[active-1].dp_flag = ACTIVE; 667 } 668 669 static void 670 change_code() 671 { 672 if (ok("Do you want to change the boot code?")) 673 init_boot(); 674 } 675 676 void 677 get_params_to_use() 678 { 679 int tmp; 680 print_params(); 681 if (ok("Do you want to change our idea of what BIOS thinks ?")) 682 { 683 do 684 { 685 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); 686 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); 687 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); 688 dos_cylsecs = dos_heads * dos_sectors; 689 print_params(); 690 } 691 while(!ok("Are you happy with this choice")); 692 } 693 } 694 695 696 /***********************************************\ 697 * Change real numbers into strange dos numbers * 698 \***********************************************/ 699 static void 700 dos(struct dos_partition *partp) 701 { 702 int cy, sec; 703 u_int32_t end; 704 705 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 706 memcpy(partp, &mtpart, sizeof(*partp)); 707 return; 708 } 709 710 /* Start c/h/s. */ 711 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 712 cy = partp->dp_start / dos_cylsecs; 713 sec = partp->dp_start % dos_sectors + 1; 714 partp->dp_scyl = DOSCYL(cy); 715 partp->dp_ssect = DOSSECT(sec, cy); 716 717 /* End c/h/s. */ 718 end = partp->dp_start + partp->dp_size - 1; 719 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 720 cy = end / dos_cylsecs; 721 sec = end % dos_sectors + 1; 722 partp->dp_ecyl = DOSCYL(cy); 723 partp->dp_esect = DOSSECT(sec, cy); 724 } 725 726 static int 727 open_disk(int flag) 728 { 729 int rwmode; 730 731 /* Write mode if one of these flags are set. */ 732 rwmode = (a_flag || I_flag || B_flag || flag); 733 fd = g_open(disk, rwmode); 734 /* If the mode fails, try read-only if we didn't. */ 735 if (fd == -1 && errno == EPERM && rwmode) 736 fd = g_open(disk, 0); 737 if (fd == -1 && errno == ENXIO) 738 return -2; 739 if (fd == -1) { 740 warnx("can't open device %s", disk); 741 return -1; 742 } 743 if (get_params() == -1) { 744 warnx("can't get disk parameters on %s", disk); 745 return -1; 746 } 747 return fd; 748 } 749 750 static ssize_t 751 read_disk(off_t sector, void *buf) 752 { 753 754 lseek(fd, (sector * 512), 0); 755 if (secsize == 0) 756 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 757 secsize *= 2) { 758 /* try the read */ 759 int size = read(fd, buf, secsize); 760 if (size == secsize) 761 /* it worked so return */ 762 return secsize; 763 } 764 else 765 return read(fd, buf, secsize); 766 767 /* we failed to read at any of the sizes */ 768 return -1; 769 } 770 771 static int 772 write_disk(off_t sector, void *buf) 773 { 774 int error; 775 struct gctl_req *grq; 776 const char *errmsg; 777 char fbuf[BUFSIZ], *pname; 778 int i, fdw; 779 780 grq = gctl_get_handle(); 781 gctl_ro_param(grq, "verb", -1, "write MBR"); 782 gctl_ro_param(grq, "class", -1, "MBR"); 783 pname = g_providername(fd); 784 if (pname == NULL) { 785 warn("Error getting providername for %s", disk); 786 return (-1); 787 } 788 gctl_ro_param(grq, "geom", -1, pname); 789 gctl_ro_param(grq, "data", secsize, buf); 790 errmsg = gctl_issue(grq); 791 free(pname); 792 if (errmsg == NULL) { 793 gctl_free(grq); 794 return(0); 795 } 796 if (!q_flag) /* GEOM errors are benign, not all devices supported */ 797 warnx("%s", errmsg); 798 gctl_free(grq); 799 800 error = pwrite(fd, buf, secsize, (sector * 512)); 801 if (error == secsize) 802 return (0); 803 804 for (i = 1; i < 5; i++) { 805 sprintf(fbuf, "%ss%d", disk, i); 806 fdw = open(fbuf, O_RDWR, 0); 807 if (fdw < 0) 808 continue; 809 error = ioctl(fdw, DIOCSMBR, buf); 810 close(fdw); 811 if (error == 0) 812 return (0); 813 } 814 warnx("Failed to write sector zero"); 815 return(EINVAL); 816 } 817 818 static int 819 get_params() 820 { 821 int error; 822 u_int u; 823 off_t o; 824 825 error = ioctl(fd, DIOCGFWSECTORS, &u); 826 if (error == 0) 827 sectors = dos_sectors = u; 828 else 829 sectors = dos_sectors = 63; 830 831 error = ioctl(fd, DIOCGFWHEADS, &u); 832 if (error == 0) 833 heads = dos_heads = u; 834 else 835 heads = dos_heads = 255; 836 837 dos_cylsecs = cylsecs = heads * sectors; 838 disksecs = cyls * heads * sectors; 839 840 u = g_sectorsize(fd); 841 if (u <= 0) 842 return (-1); 843 844 o = g_mediasize(fd); 845 if (o < 0) 846 return (-1); 847 disksecs = o / u; 848 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 849 850 return (disksecs); 851 } 852 853 static int 854 read_s0() 855 { 856 int i; 857 858 mboot.bootinst_size = secsize; 859 if (mboot.bootinst != NULL) 860 free(mboot.bootinst); 861 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 862 warnx("unable to allocate buffer to read fdisk " 863 "partition table"); 864 return -1; 865 } 866 if (read_disk(0, mboot.bootinst) == -1) { 867 warnx("can't read fdisk partition table"); 868 return -1; 869 } 870 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 871 warnx("invalid fdisk partition table found"); 872 /* So should we initialize things */ 873 return -1; 874 } 875 for (i = 0; i < NDOSPART; i++) 876 dos_partition_dec( 877 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 878 &mboot.parts[i]); 879 return 0; 880 } 881 882 static int 883 write_s0() 884 { 885 int sector, i; 886 887 if (iotest) { 888 print_s0(); 889 return 0; 890 } 891 for(i = 0; i < NDOSPART; i++) 892 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 893 &mboot.parts[i]); 894 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 895 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 896 if (write_disk(sector, 897 &mboot.bootinst[sector * secsize]) == -1) { 898 warn("can't write fdisk partition table"); 899 return -1; 900 } 901 return(0); 902 } 903 904 905 static int 906 ok(const char *str) 907 { 908 printf("%s [n] ", str); 909 fflush(stdout); 910 if (fgets(lbuf, LBUF, stdin) == NULL) 911 exit(1); 912 lbuf[strlen(lbuf)-1] = 0; 913 914 if (*lbuf && 915 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 916 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 917 return 1; 918 else 919 return 0; 920 } 921 922 static int 923 decimal(const char *str, int *num, int deflt, uint32_t maxval) 924 { 925 long long acc = 0; 926 int c; 927 char *cp; 928 929 while (1) { 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 } 967 968 969 static void 970 parse_config_line(char *line, CMD *command) 971 { 972 char *cp, *end; 973 974 cp = line; 975 while (1) { 976 memset(command, 0, sizeof(*command)); 977 978 while (isspace(*cp)) ++cp; 979 if (*cp == '\0' || *cp == '#') 980 break; 981 command->cmd = *cp++; 982 983 /* 984 * Parse args 985 */ 986 while (1) { 987 while (isspace(*cp)) ++cp; 988 if (*cp == '\0') 989 break; /* eol */ 990 if (*cp == '#') 991 break; /* found comment */ 992 if (isalpha(*cp)) 993 command->args[command->n_args].argtype = *cp++; 994 end = NULL; 995 command->args[command->n_args].arg_val = strtoul(cp, &end, 0); 996 if (cp == end || (!isspace(*end) && *end != '\0')) { 997 char ch; 998 end = cp; 999 while (!isspace(*end) && *end != '\0') ++end; 1000 ch = *end; *end = '\0'; 1001 command->args[command->n_args].arg_str = strdup(cp); 1002 *end = ch; 1003 } else 1004 command->args[command->n_args].arg_str = NULL; 1005 cp = end; 1006 command->n_args++; 1007 } 1008 break; 1009 } 1010 } 1011 1012 1013 static int 1014 process_geometry(CMD *command) 1015 { 1016 int status = 1, i; 1017 1018 while (1) { 1019 geom_processed = 1; 1020 if (part_processed) { 1021 warnx( 1022 "ERROR line %d: the geometry specification line must occur before\n\ 1023 all partition specifications", 1024 current_line_number); 1025 status = 0; 1026 break; 1027 } 1028 if (command->n_args != 3) { 1029 warnx("ERROR line %d: incorrect number of geometry args", 1030 current_line_number); 1031 status = 0; 1032 break; 1033 } 1034 dos_cyls = 0; 1035 dos_heads = 0; 1036 dos_sectors = 0; 1037 for (i = 0; i < 3; ++i) { 1038 switch (command->args[i].argtype) { 1039 case 'c': 1040 dos_cyls = command->args[i].arg_val; 1041 break; 1042 case 'h': 1043 dos_heads = command->args[i].arg_val; 1044 break; 1045 case 's': 1046 dos_sectors = command->args[i].arg_val; 1047 break; 1048 default: 1049 warnx( 1050 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1051 current_line_number, command->args[i].argtype, 1052 command->args[i].argtype); 1053 status = 0; 1054 break; 1055 } 1056 } 1057 if (status == 0) 1058 break; 1059 1060 dos_cylsecs = dos_heads * dos_sectors; 1061 1062 /* 1063 * Do sanity checks on parameter values 1064 */ 1065 if (dos_cyls == 0) { 1066 warnx("ERROR line %d: number of cylinders not specified", 1067 current_line_number); 1068 status = 0; 1069 } 1070 if (dos_cyls > 1024) { 1071 warnx( 1072 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1073 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1074 is dedicated to FreeBSD)", 1075 current_line_number, dos_cyls); 1076 } 1077 1078 if (dos_heads == 0) { 1079 warnx("ERROR line %d: number of heads not specified", 1080 current_line_number); 1081 status = 0; 1082 } else if (dos_heads > 256) { 1083 warnx("ERROR line %d: number of heads must be within (1-256)", 1084 current_line_number); 1085 status = 0; 1086 } 1087 1088 if (dos_sectors == 0) { 1089 warnx("ERROR line %d: number of sectors not specified", 1090 current_line_number); 1091 status = 0; 1092 } else if (dos_sectors > 63) { 1093 warnx("ERROR line %d: number of sectors must be within (1-63)", 1094 current_line_number); 1095 status = 0; 1096 } 1097 1098 break; 1099 } 1100 return (status); 1101 } 1102 1103 static u_int32_t 1104 str2sectors(const char *str) 1105 { 1106 char *end; 1107 unsigned long val; 1108 1109 val = strtoul(str, &end, 0); 1110 if (str == end || *end == '\0') { 1111 warnx("ERROR line %d: unexpected size: \'%s\'", 1112 current_line_number, str); 1113 return NO_DISK_SECTORS; 1114 } 1115 1116 if (*end == 'K') 1117 val *= 1024UL / secsize; 1118 else if (*end == 'M') 1119 val *= 1024UL * 1024UL / secsize; 1120 else if (*end == 'G') 1121 val *= 1024UL * 1024UL * 1024UL / secsize; 1122 else { 1123 warnx("ERROR line %d: unexpected modifier: %c " 1124 "(not K/M/G)", current_line_number, *end); 1125 return NO_DISK_SECTORS; 1126 } 1127 1128 return val; 1129 } 1130 1131 static int 1132 process_partition(CMD *command) 1133 { 1134 int status = 0, partition; 1135 u_int32_t prev_head_boundary, prev_cyl_boundary; 1136 u_int32_t adj_size, max_end; 1137 struct dos_partition *partp; 1138 1139 while (1) { 1140 part_processed = 1; 1141 if (command->n_args != 4) { 1142 warnx("ERROR line %d: incorrect number of partition args", 1143 current_line_number); 1144 break; 1145 } 1146 partition = command->args[0].arg_val; 1147 if (partition < 1 || partition > 4) { 1148 warnx("ERROR line %d: invalid partition number %d", 1149 current_line_number, partition); 1150 break; 1151 } 1152 partp = &mboot.parts[partition - 1]; 1153 bzero(partp, sizeof (*partp)); 1154 partp->dp_typ = command->args[1].arg_val; 1155 if (command->args[2].arg_str != NULL) { 1156 if (strcmp(command->args[2].arg_str, "*") == 0) { 1157 int i; 1158 partp->dp_start = dos_sectors; 1159 for (i = 1; i < partition; i++) { 1160 struct dos_partition *prev_partp; 1161 prev_partp = ((struct dos_partition *) 1162 &mboot.parts) + i - 1; 1163 if (prev_partp->dp_typ != 0) 1164 partp->dp_start = prev_partp->dp_start + 1165 prev_partp->dp_size; 1166 } 1167 if (partp->dp_start % dos_sectors != 0) { 1168 prev_head_boundary = partp->dp_start / 1169 dos_sectors * dos_sectors; 1170 partp->dp_start = prev_head_boundary + 1171 dos_sectors; 1172 } 1173 } else { 1174 partp->dp_start = str2sectors(command->args[2].arg_str); 1175 if (partp->dp_start == NO_DISK_SECTORS) 1176 break; 1177 } 1178 } else 1179 partp->dp_start = command->args[2].arg_val; 1180 1181 if (command->args[3].arg_str != NULL) { 1182 if (strcmp(command->args[3].arg_str, "*") == 0) 1183 partp->dp_size = ((disksecs / dos_cylsecs) * 1184 dos_cylsecs) - partp->dp_start; 1185 else { 1186 partp->dp_size = str2sectors(command->args[3].arg_str); 1187 if (partp->dp_size == NO_DISK_SECTORS) 1188 break; 1189 } 1190 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) / 1191 dos_cylsecs) * dos_cylsecs; 1192 if (prev_cyl_boundary > partp->dp_start) 1193 partp->dp_size = prev_cyl_boundary - partp->dp_start; 1194 } else 1195 partp->dp_size = command->args[3].arg_val; 1196 1197 max_end = partp->dp_start + partp->dp_size; 1198 1199 if (partp->dp_typ == 0) { 1200 /* 1201 * Get out, the partition is marked as unused. 1202 */ 1203 /* 1204 * Insure that it's unused. 1205 */ 1206 bzero(partp, sizeof(*partp)); 1207 status = 1; 1208 break; 1209 } 1210 1211 /* 1212 * Adjust start upwards, if necessary, to fall on a head boundary. 1213 */ 1214 if (partp->dp_start % dos_sectors != 0) { 1215 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1216 if (max_end < dos_sectors || 1217 prev_head_boundary > max_end - dos_sectors) { 1218 /* 1219 * Can't go past end of partition 1220 */ 1221 warnx( 1222 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1223 a head boundary", 1224 current_line_number, partition); 1225 break; 1226 } 1227 warnx( 1228 "WARNING: adjusting start offset of partition %d\n\ 1229 from %u to %u, to fall on a head boundary", 1230 partition, (u_int)partp->dp_start, 1231 (u_int)(prev_head_boundary + dos_sectors)); 1232 partp->dp_start = prev_head_boundary + dos_sectors; 1233 } 1234 1235 /* 1236 * Adjust size downwards, if necessary, to fall on a cylinder 1237 * boundary. 1238 */ 1239 prev_cyl_boundary = 1240 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1241 if (prev_cyl_boundary > partp->dp_start) 1242 adj_size = prev_cyl_boundary - partp->dp_start; 1243 else { 1244 warnx( 1245 "ERROR: could not adjust partition to start on a head boundary\n\ 1246 and end on a cylinder boundary."); 1247 return (0); 1248 } 1249 if (adj_size != partp->dp_size) { 1250 warnx( 1251 "WARNING: adjusting size of partition %d from %u to %u\n\ 1252 to end on a cylinder boundary", 1253 partition, (u_int)partp->dp_size, (u_int)adj_size); 1254 partp->dp_size = adj_size; 1255 } 1256 if (partp->dp_size == 0) { 1257 warnx("ERROR line %d: size of partition %d is zero", 1258 current_line_number, partition); 1259 break; 1260 } 1261 1262 dos(partp); 1263 status = 1; 1264 break; 1265 } 1266 return (status); 1267 } 1268 1269 1270 static int 1271 process_active(CMD *command) 1272 { 1273 int status = 0, partition, i; 1274 struct dos_partition *partp; 1275 1276 while (1) { 1277 active_processed = 1; 1278 if (command->n_args != 1) { 1279 warnx("ERROR line %d: incorrect number of active args", 1280 current_line_number); 1281 status = 0; 1282 break; 1283 } 1284 partition = command->args[0].arg_val; 1285 if (partition < 1 || partition > 4) { 1286 warnx("ERROR line %d: invalid partition number %d", 1287 current_line_number, partition); 1288 break; 1289 } 1290 /* 1291 * Reset active partition 1292 */ 1293 partp = mboot.parts; 1294 for (i = 0; i < NDOSPART; i++) 1295 partp[i].dp_flag = 0; 1296 partp[partition-1].dp_flag = ACTIVE; 1297 1298 status = 1; 1299 break; 1300 } 1301 return (status); 1302 } 1303 1304 1305 static int 1306 process_line(char *line) 1307 { 1308 CMD command; 1309 int status = 1; 1310 1311 while (1) { 1312 parse_config_line(line, &command); 1313 switch (command.cmd) { 1314 case 0: 1315 /* 1316 * Comment or blank line 1317 */ 1318 break; 1319 case 'g': 1320 /* 1321 * Set geometry 1322 */ 1323 status = process_geometry(&command); 1324 break; 1325 case 'p': 1326 status = process_partition(&command); 1327 break; 1328 case 'a': 1329 status = process_active(&command); 1330 break; 1331 default: 1332 status = 0; 1333 break; 1334 } 1335 break; 1336 } 1337 return (status); 1338 } 1339 1340 1341 static int 1342 read_config(char *config_file) 1343 { 1344 FILE *fp = NULL; 1345 int status = 1; 1346 char buf[1010]; 1347 1348 while (1) { 1349 if (strcmp(config_file, "-") != 0) { 1350 /* 1351 * We're not reading from stdin 1352 */ 1353 if ((fp = fopen(config_file, "r")) == NULL) { 1354 status = 0; 1355 break; 1356 } 1357 } else { 1358 fp = stdin; 1359 } 1360 current_line_number = 0; 1361 while (!feof(fp)) { 1362 if (fgets(buf, sizeof(buf), fp) == NULL) 1363 break; 1364 ++current_line_number; 1365 status = process_line(buf); 1366 if (status == 0) 1367 break; 1368 } 1369 break; 1370 } 1371 if (fp) { 1372 /* 1373 * It doesn't matter if we're reading from stdin, as we've reached EOF 1374 */ 1375 fclose(fp); 1376 } 1377 return (status); 1378 } 1379 1380 1381 static void 1382 reset_boot(void) 1383 { 1384 int i; 1385 struct dos_partition *partp; 1386 1387 init_boot(); 1388 for (i = 0; i < 4; ++i) { 1389 partp = &mboot.parts[i]; 1390 bzero(partp, sizeof(*partp)); 1391 } 1392 } 1393 1394 static int 1395 sanitize_partition(struct dos_partition *partp) 1396 { 1397 u_int32_t prev_head_boundary, prev_cyl_boundary; 1398 u_int32_t max_end, size, start; 1399 1400 start = partp->dp_start; 1401 size = partp->dp_size; 1402 max_end = start + size; 1403 /* Only allow a zero size if the partition is being marked unused. */ 1404 if (size == 0) { 1405 if (start == 0 && partp->dp_typ == 0) 1406 return (1); 1407 warnx("ERROR: size of partition is zero"); 1408 return (0); 1409 } 1410 /* Return if no adjustment is necessary. */ 1411 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1412 return (1); 1413 1414 if (start == 0) { 1415 warnx("WARNING: partition overlaps with partition table"); 1416 if (ok("Correct this automatically?")) 1417 start = dos_sectors; 1418 } 1419 if (start % dos_sectors != 0) 1420 warnx("WARNING: partition does not start on a head boundary"); 1421 if ((start +size) % dos_sectors != 0) 1422 warnx("WARNING: partition does not end on a cylinder boundary"); 1423 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1424 if (!ok("Correct this automatically?")) 1425 return (1); 1426 1427 /* 1428 * Adjust start upwards, if necessary, to fall on a head boundary. 1429 */ 1430 if (start % dos_sectors != 0) { 1431 prev_head_boundary = start / dos_sectors * dos_sectors; 1432 if (max_end < dos_sectors || 1433 prev_head_boundary >= max_end - dos_sectors) { 1434 /* 1435 * Can't go past end of partition 1436 */ 1437 warnx( 1438 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1439 return (0); 1440 } 1441 start = prev_head_boundary + dos_sectors; 1442 } 1443 1444 /* 1445 * Adjust size downwards, if necessary, to fall on a cylinder 1446 * boundary. 1447 */ 1448 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1449 if (prev_cyl_boundary > start) 1450 size = prev_cyl_boundary - start; 1451 else { 1452 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1453 and end on a cylinder boundary."); 1454 return (0); 1455 } 1456 1457 /* Finally, commit any changes to partp and return. */ 1458 if (start != partp->dp_start) { 1459 warnx("WARNING: adjusting start offset of partition to %u", 1460 (u_int)start); 1461 partp->dp_start = start; 1462 } 1463 if (size != partp->dp_size) { 1464 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1465 partp->dp_size = size; 1466 } 1467 1468 return (1); 1469 } 1470 1471 /* 1472 * Try figuring out the root device's canonical disk name. 1473 * The following choices are considered: 1474 * /dev/ad0s1a => /dev/ad0 1475 * /dev/da0a => /dev/da0 1476 * /dev/vinum/root => /dev/vinum/root 1477 * A ".eli" part is removed if it exists (see geli(8)). 1478 * A ".journal" ending is removed if it exists (see gjournal(8)). 1479 */ 1480 static char * 1481 get_rootdisk(void) 1482 { 1483 struct statfs rootfs; 1484 regex_t re; 1485 #define NMATCHES 2 1486 regmatch_t rm[NMATCHES]; 1487 char dev[PATH_MAX], *s; 1488 int rv; 1489 1490 if (statfs("/", &rootfs) == -1) 1491 err(1, "statfs(\"/\")"); 1492 1493 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", 1494 REG_EXTENDED)) != 0) 1495 errx(1, "regcomp() failed (%d)", rv); 1496 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); 1497 if ((s = strstr(dev, ".eli")) != NULL) 1498 memmove(s, s+4, strlen(s + 4) + 1); 1499 1500 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) 1501 errx(1, 1502 "mounted root fs resource doesn't match expectations (regexec returned %d)", 1503 rv); 1504 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1505 errx(1, "out of memory"); 1506 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1507 rm[1].rm_eo - rm[1].rm_so); 1508 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1509 1510 return s; 1511 } 1512