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 * 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 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 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 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 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 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 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 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 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 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 669 change_code(void) 670 { 671 if (ok("Do you want to change the boot code?")) 672 init_boot(); 673 } 674 675 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 * 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