fdisk.c revision 100202
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#ifndef lint 28static const char rcsid[] = 29 "$FreeBSD: head/sbin/fdisk/fdisk.c 100202 2002-07-16 23:18:29Z bde $"; 30#endif /* not lint */ 31 32#include <sys/disklabel.h> 33#include <sys/param.h> 34#include <sys/stat.h> 35#include <sys/mount.h> 36#include <ctype.h> 37#include <fcntl.h> 38#include <err.h> 39#include <errno.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 48int iotest; 49 50#define LBUF 100 51static char lbuf[LBUF]; 52 53#define MBRSIGOFF 510 54 55/* 56 * 57 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 58 * 59 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 60 * Copyright (c) 1989 Robert. V. Baron 61 * Created. 62 */ 63 64#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 65 66#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 67 68#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 69#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 70static int secsize = 0; /* the sensed sector size */ 71 72static char *disk; 73 74static struct disklabel disklabel; /* disk parameters */ 75 76static int cyls, sectors, heads, cylsecs, disksecs; 77 78struct mboot { 79 unsigned char padding[2]; /* force the longs to be long aligned */ 80 unsigned char *bootinst; /* boot code */ 81 off_t bootinst_size; 82 struct dos_partition parts[4]; 83}; 84 85static struct mboot mboot; 86static int fd; 87 88#define ACTIVE 0x80 89#define BOOT_MAGIC 0xAA55 90 91static uint dos_cyls; 92static uint dos_heads; 93static uint dos_sectors; 94static 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 101static int current_line_number; 102 103static int geom_processed = 0; 104static int part_processed = 0; 105static int active_processed = 0; 106 107typedef struct cmd { 108 char cmd; 109 int n_args; 110 struct arg { 111 char argtype; 112 int arg_val; 113 } args[MAX_ARGS]; 114} CMD; 115 116static int B_flag = 0; /* replace boot code */ 117static int I_flag = 0; /* use entire disk for FreeBSD */ 118static int a_flag = 0; /* set active partition */ 119static char *b_flag = NULL; /* path to boot code */ 120static int i_flag = 0; /* replace partition data */ 121static int u_flag = 0; /* update partition data */ 122static int s_flag = 0; /* Print a summary and exit */ 123static int t_flag = 0; /* test only */ 124static char *f_flag = NULL; /* Read config info from file */ 125static int v_flag = 0; /* Be verbose */ 126 127static struct part_type 128{ 129 unsigned char type; 130 const char *name; 131} part_types[] = { 132 {0x00, "unused"} 133 ,{0x01, "Primary DOS with 12 bit FAT"} 134 ,{0x02, "XENIX / filesystem"} 135 ,{0x03, "XENIX /usr filesystem"} 136 ,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"} 137 ,{0x05, "Extended DOS"} 138 ,{0x06, "Primary 'big' DOS (>= 32MB)"} 139 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 140 ,{0x08, "AIX filesystem or SplitDrive"} 141 ,{0x09, "AIX boot partition or Coherent"} 142 ,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"} 143 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 144 ,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"} 145 ,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"} 146 ,{0x0F, "Extended DOS (LBA)"} 147 ,{0x10, "OPUS"} 148 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 149 ,{0x12, "Compaq diagnostics"} 150 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 151 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 152 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 153 ,{0x18, "AST Windows swapfile"} 154 ,{0x24, "NEC DOS"} 155 ,{0x3C, "PartitionMagic recovery"} 156 ,{0x39, "plan9"} 157 ,{0x40, "VENIX 286"} 158 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 159 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 160 ,{0x43, "Linux native (sharing disk with DRDOS)"} 161 ,{0x4D, "QNX 4.2 Primary"} 162 ,{0x4E, "QNX 4.2 Secondary"} 163 ,{0x4F, "QNX 4.2 Tertiary"} 164 ,{0x50, "DM (disk manager)"} 165 ,{0x51, "DM6 Aux1 (or Novell)"} 166 ,{0x52, "CP/M or Microport SysV/AT"} 167 ,{0x53, "DM6 Aux3"} 168 ,{0x54, "DM6"} 169 ,{0x55, "EZ-Drive (disk manager)"} 170 ,{0x56, "Golden Bow (disk manager)"} 171 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 172 ,{0x61, "SpeedStor"} 173 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"} 174 ,{0x64, "Novell Netware/286 2.xx"} 175 ,{0x65, "Novell Netware/386 3.xx"} 176 ,{0x70, "DiskSecure Multi-Boot"} 177 ,{0x75, "PCIX"} 178 ,{0x77, "QNX4.x"} 179 ,{0x78, "QNX4.x 2nd part"} 180 ,{0x79, "QNX4.x 3rd part"} 181 ,{0x80, "Minix until 1.4a"} 182 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"} 183 ,{0x82, "Linux swap or Solaris x86"} 184 ,{0x83, "Linux native"} 185 ,{0x84, "OS/2 hidden C: drive"} 186 ,{0x85, "Linux extended"} 187 ,{0x86, "NTFS volume set??"} 188 ,{0x87, "NTFS volume set??"} 189 ,{0x93, "Amoeba filesystem"} 190 ,{0x94, "Amoeba bad block table"} 191 ,{0x9F, "BSD/OS"} 192 ,{0xA0, "Suspend to Disk"} 193 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 194 ,{0xA6, "OpenBSD"} 195 ,{0xA7, "NeXTSTEP"} 196 ,{0xA9, "NetBSD"} 197 ,{0xAC, "IBM JFS"} 198 ,{0xB7, "BSDI BSD/386 filesystem"} 199 ,{0xB8, "BSDI BSD/386 swap"} 200 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 201 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 202 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 203 ,{0xC7, "Syrinx"} 204 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 205 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 206 ,{0xE3, "DOS R/O or SpeedStor"} 207 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 208 ,{0xEB, "BeOS filesystem"} 209 ,{0xEE, "EFI GPT"} 210 ,{0xEF, "EFI System Partition"} 211 ,{0xF1, "SpeedStor"} 212 ,{0xF2, "DOS 3.3+ Secondary"} 213 ,{0xF4, "SpeedStor large partition"} 214 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 215 ,{0xFF, "Xenix bad blocks table"} 216}; 217 218static void print_s0(int which); 219static void print_part(int i); 220static void init_sector0(unsigned long start); 221static void init_boot(void); 222static void change_part(int i); 223static void print_params(void); 224static void change_active(int which); 225static void change_code(void); 226static void get_params_to_use(void); 227static char *get_rootdisk(void); 228static void dos(struct dos_partition *partp); 229static int open_disk(int flag); 230static ssize_t read_disk(off_t sector, void *buf); 231static ssize_t write_disk(off_t sector, void *buf); 232static int get_params(void); 233static int read_s0(void); 234static int write_s0(void); 235static int ok(const char *str); 236static int decimal(const char *str, int *num, int deflt); 237static const char *get_type(int type); 238static int read_config(char *config_file); 239static void reset_boot(void); 240static int sanitize_partition(struct dos_partition *); 241static void usage(void); 242 243int 244main(int argc, char *argv[]) 245{ 246 struct stat sb; 247 int c, i; 248 int partition = -1; 249 struct dos_partition *partp; 250 251 while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1) 252 switch (c) { 253 case 'B': 254 B_flag = 1; 255 break; 256 case 'I': 257 I_flag = 1; 258 break; 259 case 'a': 260 a_flag = 1; 261 break; 262 case 'b': 263 b_flag = optarg; 264 break; 265 case 'f': 266 f_flag = optarg; 267 break; 268 case 'i': 269 i_flag = 1; 270 break; 271 case 's': 272 s_flag = 1; 273 break; 274 case 't': 275 t_flag = 1; 276 break; 277 case 'u': 278 u_flag = 1; 279 break; 280 case 'v': 281 v_flag = 1; 282 break; 283 case '1': 284 case '2': 285 case '3': 286 case '4': 287 partition = c - '0'; 288 break; 289 default: 290 usage(); 291 } 292 if (f_flag || i_flag) 293 u_flag = 1; 294 if (t_flag) 295 v_flag = 1; 296 argc -= optind; 297 argv += optind; 298 299 if (argc == 0) { 300 disk = get_rootdisk(); 301 } else { 302 if (stat(argv[0], &sb) == 0) { 303 /* OK, full pathname given */ 304 disk = argv[0]; 305 } else if (errno == ENOENT) { 306 /* Try prepending "/dev" */ 307 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 308 if (disk == NULL) 309 errx(1, "out of memory"); 310 } else { 311 /* other stat error, let it fail below */ 312 disk = argv[0]; 313 } 314 } 315 if (open_disk(u_flag) < 0) 316 err(1, "cannot open disk %s", disk); 317 318 /* (abu)use mboot.bootinst to probe for the sector size */ 319 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 320 err(1, "cannot allocate buffer to determine disk sector size"); 321 read_disk(0, mboot.bootinst); 322 free(mboot.bootinst); 323 mboot.bootinst = NULL; 324 325 if (s_flag) { 326 if (read_s0()) 327 err(1, "read_s0"); 328 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 329 dos_sectors); 330 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 331 for (i = 0; i < NDOSPART; i++) { 332 partp = ((struct dos_partition *) &mboot.parts) + i; 333 if (partp->dp_start == 0 && partp->dp_size == 0) 334 continue; 335 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 336 (u_long) partp->dp_start, 337 (u_long) partp->dp_size, partp->dp_typ, 338 partp->dp_flag); 339 } 340 exit(0); 341 } 342 343 printf("******* Working on device %s *******\n",disk); 344 345 if (I_flag) { 346 read_s0(); 347 reset_boot(); 348 partp = (struct dos_partition *) (&mboot.parts[0]); 349 partp->dp_typ = DOSPTYP_386BSD; 350 partp->dp_flag = ACTIVE; 351 partp->dp_start = dos_sectors; 352 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 353 dos_sectors; 354 dos(partp); 355 if (v_flag) 356 print_s0(-1); 357 if (!t_flag) 358 write_s0(); 359 exit(0); 360 } 361 if (f_flag) { 362 if (read_s0() || i_flag) 363 reset_boot(); 364 if (!read_config(f_flag)) 365 exit(1); 366 if (v_flag) 367 print_s0(-1); 368 if (!t_flag) 369 write_s0(); 370 } else { 371 if(u_flag) 372 get_params_to_use(); 373 else 374 print_params(); 375 376 if (read_s0()) 377 init_sector0(dos_sectors); 378 379 printf("Media sector size is %d\n", secsize); 380 printf("Warning: BIOS sector numbering starts with sector 1\n"); 381 printf("Information from DOS bootblock is:\n"); 382 if (partition == -1) 383 for (i = 1; i <= NDOSPART; i++) 384 change_part(i); 385 else 386 change_part(partition); 387 388 if (u_flag || a_flag) 389 change_active(partition); 390 391 if (B_flag) 392 change_code(); 393 394 if (u_flag || a_flag || B_flag) { 395 if (!t_flag) { 396 printf("\nWe haven't changed the partition table yet. "); 397 printf("This is your last chance.\n"); 398 } 399 print_s0(-1); 400 if (!t_flag) { 401 if (ok("Should we write new partition table?")) 402 write_s0(); 403 } else { 404 printf("\n-t flag specified -- partition table not written.\n"); 405 } 406 } 407 } 408 409 exit(0); 410} 411 412static void 413usage() 414{ 415 fprintf(stderr, "%s%s", 416 "usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n", 417 " fdisk -f configfile [-itv] [disk]\n"); 418 exit(1); 419} 420 421static void 422print_s0(int which) 423{ 424 int i; 425 426 print_params(); 427 printf("Information from DOS bootblock is:\n"); 428 if (which == -1) 429 for (i = 1; i <= NDOSPART; i++) 430 printf("%d: ", i), print_part(i); 431 else 432 print_part(which); 433} 434 435static struct dos_partition mtpart; 436 437static void 438print_part(int i) 439{ 440 struct dos_partition *partp; 441 u_int64_t part_mb; 442 443 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 444 445 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 446 printf("<UNUSED>\n"); 447 return; 448 } 449 /* 450 * Be careful not to overflow. 451 */ 452 part_mb = partp->dp_size; 453 part_mb *= secsize; 454 part_mb /= (1024 * 1024); 455 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 456 get_type(partp->dp_typ)); 457 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 458 (u_long)partp->dp_start, 459 (u_long)partp->dp_size, 460 (uintmax_t)part_mb, 461 partp->dp_flag, 462 partp->dp_flag == ACTIVE ? " (active)" : ""); 463 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 464 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 465 ,partp->dp_shd 466 ,DPSECT(partp->dp_ssect) 467 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 468 ,partp->dp_ehd 469 ,DPSECT(partp->dp_esect)); 470} 471 472 473static void 474init_boot(void) 475{ 476#ifndef __ia64__ 477 const char *fname; 478 int fdesc, n; 479 struct stat sb; 480 481 fname = b_flag ? b_flag : "/boot/mbr"; 482 if ((fdesc = open(fname, O_RDONLY)) == -1 || 483 fstat(fdesc, &sb) == -1) 484 err(1, "%s", fname); 485 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 486 errx(1, "%s: length must be a multiple of sector size", fname); 487 if (mboot.bootinst != NULL) 488 free(mboot.bootinst); 489 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 490 errx(1, "%s: unable to allocate read buffer", fname); 491 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 492 close(fdesc)) 493 err(1, "%s", fname); 494 if (n != mboot.bootinst_size) 495 errx(1, "%s: short read", fname); 496#else 497 if (mboot.bootinst != NULL) 498 free(mboot.bootinst); 499 mboot.bootinst_size = secsize; 500 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 501 errx(1, "unable to allocate boot block buffer"); 502 memset(mboot.bootinst, 0, mboot.bootinst_size); 503 *(uint16_t *)(void *)&mboot.bootinst[MBRSIGOFF] = BOOT_MAGIC; 504#endif 505} 506 507 508static void 509init_sector0(unsigned long start) 510{ 511 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]); 512 513 init_boot(); 514 515 partp->dp_typ = DOSPTYP_386BSD; 516 partp->dp_flag = ACTIVE; 517 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 518 if(start == 0) 519 start = dos_sectors; 520 partp->dp_start = start; 521 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 522 523 dos(partp); 524} 525 526static void 527change_part(int i) 528{ 529 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 530 531 printf("The data for partition %d is:\n", i); 532 print_part(i); 533 534 if (u_flag && ok("Do you want to change it?")) { 535 int tmp; 536 537 if (i_flag) { 538 bzero((char *)partp, sizeof (struct dos_partition)); 539 if (i == 4) { 540 init_sector0(1); 541 printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n"); 542 print_part(i); 543 } 544 } 545 546 do { 547 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 548 Decimal("start", partp->dp_start, tmp); 549 Decimal("size", partp->dp_size, tmp); 550 if (!sanitize_partition(partp)) { 551 warnx("ERROR: failed to adjust; setting sysid to 0"); 552 partp->dp_typ = 0; 553 } 554 555 if (ok("Explicitly specify beg/end address ?")) 556 { 557 int tsec,tcyl,thd; 558 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 559 thd = partp->dp_shd; 560 tsec = DPSECT(partp->dp_ssect); 561 Decimal("beginning cylinder", tcyl, tmp); 562 Decimal("beginning head", thd, tmp); 563 Decimal("beginning sector", tsec, tmp); 564 partp->dp_scyl = DOSCYL(tcyl); 565 partp->dp_ssect = DOSSECT(tsec,tcyl); 566 partp->dp_shd = thd; 567 568 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 569 thd = partp->dp_ehd; 570 tsec = DPSECT(partp->dp_esect); 571 Decimal("ending cylinder", tcyl, tmp); 572 Decimal("ending head", thd, tmp); 573 Decimal("ending sector", tsec, tmp); 574 partp->dp_ecyl = DOSCYL(tcyl); 575 partp->dp_esect = DOSSECT(tsec,tcyl); 576 partp->dp_ehd = thd; 577 } else 578 dos(partp); 579 580 print_part(i); 581 } while (!ok("Are we happy with this entry?")); 582 } 583 } 584 585static void 586print_params() 587{ 588 printf("parameters extracted from in-core disklabel are:\n"); 589 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 590 ,cyls,heads,sectors,cylsecs); 591 if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255)) 592 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 593 printf("parameters to be used for BIOS calculations are:\n"); 594 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 595 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 596} 597 598static void 599change_active(int which) 600{ 601 struct dos_partition *partp = &mboot.parts[0]; 602 int active, i, new, tmp; 603 604 active = -1; 605 for (i = 0; i < NDOSPART; i++) { 606 if ((partp[i].dp_flag & ACTIVE) == 0) 607 continue; 608 printf("Partition %d is marked active\n", i + 1); 609 if (active == -1) 610 active = i + 1; 611 } 612 if (a_flag && which != -1) 613 active = which; 614 else if (active == -1) 615 active = 1; 616 617 if (!ok("Do you want to change the active partition?")) 618 return; 619setactive: 620 do { 621 new = active; 622 Decimal("active partition", new, tmp); 623 if (new < 1 || new > 4) { 624 printf("Active partition number must be in range 1-4." 625 " Try again.\n"); 626 goto setactive; 627 } 628 active = new; 629 } while (!ok("Are you happy with this choice")); 630 for (i = 0; i < NDOSPART; i++) 631 partp[i].dp_flag = 0; 632 if (active > 0 && active <= NDOSPART) 633 partp[active-1].dp_flag = ACTIVE; 634} 635 636static void 637change_code() 638{ 639 if (ok("Do you want to change the boot code?")) 640 init_boot(); 641} 642 643void 644get_params_to_use() 645{ 646 int tmp; 647 print_params(); 648 if (ok("Do you want to change our idea of what BIOS thinks ?")) 649 { 650 do 651 { 652 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 653 Decimal("BIOS's idea of #heads", dos_heads, tmp); 654 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 655 dos_cylsecs = dos_heads * dos_sectors; 656 print_params(); 657 } 658 while(!ok("Are you happy with this choice")); 659 } 660} 661 662 663/***********************************************\ 664* Change real numbers into strange dos numbers * 665\***********************************************/ 666static void 667dos(struct dos_partition *partp) 668{ 669 int cy, sec; 670 u_int32_t end; 671 672 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 673 memcpy(partp, &mtpart, sizeof(*partp)); 674 return; 675 } 676 677 /* Start c/h/s. */ 678 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 679 cy = partp->dp_start / dos_cylsecs; 680 sec = partp->dp_start % dos_sectors + 1; 681 partp->dp_scyl = DOSCYL(cy); 682 partp->dp_ssect = DOSSECT(sec, cy); 683 684 /* End c/h/s. */ 685 end = partp->dp_start + partp->dp_size - 1; 686 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 687 cy = end / dos_cylsecs; 688 sec = end % dos_sectors + 1; 689 partp->dp_ecyl = DOSCYL(cy); 690 partp->dp_esect = DOSSECT(sec, cy); 691} 692 693static int 694open_disk(int flag) 695{ 696 struct stat st; 697 698 if (stat(disk, &st) == -1) { 699 if (errno == ENOENT) 700 return -2; 701 warnx("can't get file status of %s", disk); 702 return -1; 703 } 704 if ( !(st.st_mode & S_IFCHR) ) 705 warnx("device %s is not character special", disk); 706 if ((fd = open(disk, 707 a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY)) == -1) { 708 if(errno == ENXIO) 709 return -2; 710 warnx("can't open device %s", disk); 711 return -1; 712 } 713 if (get_params() == -1) { 714 warnx("can't get disk parameters on %s", disk); 715 return -1; 716 } 717 return fd; 718} 719 720static ssize_t 721read_disk(off_t sector, void *buf) 722{ 723 lseek(fd,(sector * 512), 0); 724 if( secsize == 0 ) 725 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 726 { 727 /* try the read */ 728 int size = read(fd, buf, secsize); 729 if( size == secsize ) 730 /* it worked so return */ 731 return secsize; 732 } 733 else 734 return read( fd, buf, secsize ); 735 736 /* we failed to read at any of the sizes */ 737 return -1; 738} 739 740static ssize_t 741write_disk(off_t sector, void *buf) 742{ 743 lseek(fd,(sector * 512), 0); 744 /* write out in the size that the read_disk found worked */ 745 return write(fd, buf, secsize); 746} 747 748static int 749get_params() 750{ 751 752 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 753 warnx("can't get disk parameters on %s; supplying dummy ones", disk); 754 dos_cyls = cyls = 1; 755 dos_heads = heads = 1; 756 dos_sectors = sectors = 1; 757 dos_cylsecs = cylsecs = heads * sectors; 758 disksecs = cyls * heads * sectors; 759 return disksecs; 760 } 761 762 dos_cyls = cyls = disklabel.d_ncylinders; 763 dos_heads = heads = disklabel.d_ntracks; 764 dos_sectors = sectors = disklabel.d_nsectors; 765 dos_cylsecs = cylsecs = heads * sectors; 766 disksecs = cyls * heads * sectors; 767 768 return (disksecs); 769} 770 771 772static int 773read_s0() 774{ 775 mboot.bootinst_size = secsize; 776 if (mboot.bootinst != NULL) 777 free(mboot.bootinst); 778 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 779 warnx("unable to allocate buffer to read fdisk " 780 "partition table"); 781 return -1; 782 } 783 if (read_disk(0, mboot.bootinst) == -1) { 784 warnx("can't read fdisk partition table"); 785 return -1; 786 } 787 if (*(uint16_t *)(void *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 788 warnx("invalid fdisk partition table found"); 789 /* So should we initialize things */ 790 return -1; 791 } 792 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 793 return 0; 794} 795 796static int 797write_s0() 798{ 799 int sector; 800 801 if (iotest) { 802 print_s0(-1); 803 return 0; 804 } 805 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 806 /* 807 * write enable label sector before write (if necessary), 808 * disable after writing. 809 * needed if the disklabel protected area also protects 810 * sector 0. (e.g. empty disk) 811 */ 812 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 813 if (write_disk(sector, 814 &mboot.bootinst[sector * secsize]) == -1) { 815 warn("can't write fdisk partition table"); 816 return -1; 817 } 818 return(0); 819} 820 821 822static int 823ok(const char *str) 824{ 825 printf("%s [n] ", str); 826 fflush(stdout); 827 if (fgets(lbuf, LBUF, stdin) == NULL) 828 exit(1); 829 lbuf[strlen(lbuf)-1] = 0; 830 831 if (*lbuf && 832 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 833 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 834 return 1; 835 else 836 return 0; 837} 838 839static int 840decimal(const char *str, int *num, int deflt) 841{ 842 int acc = 0, c; 843 char *cp; 844 845 while (1) { 846 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 847 fflush(stdout); 848 if (fgets(lbuf, LBUF, stdin) == NULL) 849 exit(1); 850 lbuf[strlen(lbuf)-1] = 0; 851 852 if (!*lbuf) 853 return 0; 854 855 cp = lbuf; 856 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 857 if (!c) 858 return 0; 859 while ((c = *cp++)) { 860 if (c <= '9' && c >= '0') 861 acc = acc * 10 + c - '0'; 862 else 863 break; 864 } 865 if (c == ' ' || c == '\t') 866 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 867 if (!c) { 868 *num = acc; 869 return 1; 870 } else 871 printf("%s is an invalid decimal number. Try again.\n", 872 lbuf); 873 } 874 875} 876 877static const char * 878get_type(int type) 879{ 880 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 881 int counter = 0; 882 struct part_type *ptr = part_types; 883 884 885 while(counter < numentries) { 886 if(ptr->type == type) 887 return(ptr->name); 888 ptr++; 889 counter++; 890 } 891 return("unknown"); 892} 893 894 895static void 896parse_config_line(char *line, CMD *command) 897{ 898 char *cp, *end; 899 900 cp = line; 901 while (1) { 902 memset(command, 0, sizeof(*command)); 903 904 while (isspace(*cp)) ++cp; 905 if (*cp == '\0' || *cp == '#') 906 break; 907 command->cmd = *cp++; 908 909 /* 910 * Parse args 911 */ 912 while (1) { 913 while (isspace(*cp)) ++cp; 914 if (*cp == '#') 915 break; /* found comment */ 916 if (isalpha(*cp)) 917 command->args[command->n_args].argtype = *cp++; 918 if (!isdigit(*cp)) 919 break; /* assume end of line */ 920 end = NULL; 921 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 922 if (cp == end) 923 break; /* couldn't parse number */ 924 cp = end; 925 command->n_args++; 926 } 927 break; 928 } 929} 930 931 932static int 933process_geometry(CMD *command) 934{ 935 int status = 1, i; 936 937 while (1) { 938 geom_processed = 1; 939 if (part_processed) { 940 warnx( 941 "ERROR line %d: the geometry specification line must occur before\n\ 942 all partition specifications", 943 current_line_number); 944 status = 0; 945 break; 946 } 947 if (command->n_args != 3) { 948 warnx("ERROR line %d: incorrect number of geometry args", 949 current_line_number); 950 status = 0; 951 break; 952 } 953 dos_cyls = 0; 954 dos_heads = 0; 955 dos_sectors = 0; 956 for (i = 0; i < 3; ++i) { 957 switch (command->args[i].argtype) { 958 case 'c': 959 dos_cyls = command->args[i].arg_val; 960 break; 961 case 'h': 962 dos_heads = command->args[i].arg_val; 963 break; 964 case 's': 965 dos_sectors = command->args[i].arg_val; 966 break; 967 default: 968 warnx( 969 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 970 current_line_number, command->args[i].argtype, 971 command->args[i].argtype); 972 status = 0; 973 break; 974 } 975 } 976 if (status == 0) 977 break; 978 979 dos_cylsecs = dos_heads * dos_sectors; 980 981 /* 982 * Do sanity checks on parameter values 983 */ 984 if (dos_cyls == 0) { 985 warnx("ERROR line %d: number of cylinders not specified", 986 current_line_number); 987 status = 0; 988 } 989 if (dos_cyls > 1024) { 990 warnx( 991 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 992 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 993 is dedicated to FreeBSD)", 994 current_line_number, dos_cyls); 995 } 996 997 if (dos_heads == 0) { 998 warnx("ERROR line %d: number of heads not specified", 999 current_line_number); 1000 status = 0; 1001 } else if (dos_heads > 256) { 1002 warnx("ERROR line %d: number of heads must be within (1-256)", 1003 current_line_number); 1004 status = 0; 1005 } 1006 1007 if (dos_sectors == 0) { 1008 warnx("ERROR line %d: number of sectors not specified", 1009 current_line_number); 1010 status = 0; 1011 } else if (dos_sectors > 63) { 1012 warnx("ERROR line %d: number of sectors must be within (1-63)", 1013 current_line_number); 1014 status = 0; 1015 } 1016 1017 break; 1018 } 1019 return (status); 1020} 1021 1022 1023static int 1024process_partition(CMD *command) 1025{ 1026 int status = 0, partition; 1027 u_int32_t prev_head_boundary, prev_cyl_boundary; 1028 u_int32_t adj_size, max_end; 1029 struct dos_partition *partp; 1030 1031 while (1) { 1032 part_processed = 1; 1033 if (command->n_args != 4) { 1034 warnx("ERROR line %d: incorrect number of partition args", 1035 current_line_number); 1036 break; 1037 } 1038 partition = command->args[0].arg_val; 1039 if (partition < 1 || partition > 4) { 1040 warnx("ERROR line %d: invalid partition number %d", 1041 current_line_number, partition); 1042 break; 1043 } 1044 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1045 bzero((char *)partp, sizeof (struct dos_partition)); 1046 partp->dp_typ = command->args[1].arg_val; 1047 partp->dp_start = command->args[2].arg_val; 1048 partp->dp_size = command->args[3].arg_val; 1049 max_end = partp->dp_start + partp->dp_size; 1050 1051 if (partp->dp_typ == 0) { 1052 /* 1053 * Get out, the partition is marked as unused. 1054 */ 1055 /* 1056 * Insure that it's unused. 1057 */ 1058 bzero((char *)partp, sizeof (struct dos_partition)); 1059 status = 1; 1060 break; 1061 } 1062 1063 /* 1064 * Adjust start upwards, if necessary, to fall on an head boundary. 1065 */ 1066 if (partp->dp_start % dos_sectors != 0) { 1067 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1068 if (max_end < dos_sectors || 1069 prev_head_boundary > max_end - dos_sectors) { 1070 /* 1071 * Can't go past end of partition 1072 */ 1073 warnx( 1074 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1075 a head boundary", 1076 current_line_number, partition); 1077 break; 1078 } 1079 warnx( 1080 "WARNING: adjusting start offset of partition %d\n\ 1081 from %u to %u, to fall on a head boundary", 1082 partition, (u_int)partp->dp_start, 1083 (u_int)(prev_head_boundary + dos_sectors)); 1084 partp->dp_start = prev_head_boundary + dos_sectors; 1085 } 1086 1087 /* 1088 * Adjust size downwards, if necessary, to fall on a cylinder 1089 * boundary. 1090 */ 1091 prev_cyl_boundary = 1092 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1093 if (prev_cyl_boundary > partp->dp_start) 1094 adj_size = prev_cyl_boundary - partp->dp_start; 1095 else { 1096 warnx( 1097 "ERROR: could not adjust partition to start on a head boundary\n\ 1098 and end on a cylinder boundary."); 1099 return (0); 1100 } 1101 if (adj_size != partp->dp_size) { 1102 warnx( 1103 "WARNING: adjusting size of partition %d from %u to %u\n\ 1104 to end on a cylinder boundary", 1105 partition, (u_int)partp->dp_size, (u_int)adj_size); 1106 partp->dp_size = adj_size; 1107 } 1108 if (partp->dp_size == 0) { 1109 warnx("ERROR line %d: size of partition %d is zero", 1110 current_line_number, partition); 1111 break; 1112 } 1113 1114 dos(partp); 1115 status = 1; 1116 break; 1117 } 1118 return (status); 1119} 1120 1121 1122static int 1123process_active(CMD *command) 1124{ 1125 int status = 0, partition, i; 1126 struct dos_partition *partp; 1127 1128 while (1) { 1129 active_processed = 1; 1130 if (command->n_args != 1) { 1131 warnx("ERROR line %d: incorrect number of active args", 1132 current_line_number); 1133 status = 0; 1134 break; 1135 } 1136 partition = command->args[0].arg_val; 1137 if (partition < 1 || partition > 4) { 1138 warnx("ERROR line %d: invalid partition number %d", 1139 current_line_number, partition); 1140 break; 1141 } 1142 /* 1143 * Reset active partition 1144 */ 1145 partp = ((struct dos_partition *) &mboot.parts); 1146 for (i = 0; i < NDOSPART; i++) 1147 partp[i].dp_flag = 0; 1148 partp[partition-1].dp_flag = ACTIVE; 1149 1150 status = 1; 1151 break; 1152 } 1153 return (status); 1154} 1155 1156 1157static int 1158process_line(char *line) 1159{ 1160 CMD command; 1161 int status = 1; 1162 1163 while (1) { 1164 parse_config_line(line, &command); 1165 switch (command.cmd) { 1166 case 0: 1167 /* 1168 * Comment or blank line 1169 */ 1170 break; 1171 case 'g': 1172 /* 1173 * Set geometry 1174 */ 1175 status = process_geometry(&command); 1176 break; 1177 case 'p': 1178 status = process_partition(&command); 1179 break; 1180 case 'a': 1181 status = process_active(&command); 1182 break; 1183 default: 1184 status = 0; 1185 break; 1186 } 1187 break; 1188 } 1189 return (status); 1190} 1191 1192 1193static int 1194read_config(char *config_file) 1195{ 1196 FILE *fp = NULL; 1197 int status = 1; 1198 char buf[1010]; 1199 1200 while (1) { 1201 if (strcmp(config_file, "-") != 0) { 1202 /* 1203 * We're not reading from stdin 1204 */ 1205 if ((fp = fopen(config_file, "r")) == NULL) { 1206 status = 0; 1207 break; 1208 } 1209 } else { 1210 fp = stdin; 1211 } 1212 current_line_number = 0; 1213 while (!feof(fp)) { 1214 if (fgets(buf, sizeof(buf), fp) == NULL) 1215 break; 1216 ++current_line_number; 1217 status = process_line(buf); 1218 if (status == 0) 1219 break; 1220 } 1221 break; 1222 } 1223 if (fp) { 1224 /* 1225 * It doesn't matter if we're reading from stdin, as we've reached EOF 1226 */ 1227 fclose(fp); 1228 } 1229 return (status); 1230} 1231 1232 1233static void 1234reset_boot(void) 1235{ 1236 int i; 1237 struct dos_partition *partp; 1238 1239 init_boot(); 1240 for (i = 0; i < 4; ++i) { 1241 partp = ((struct dos_partition *) &mboot.parts) + i; 1242 bzero((char *)partp, sizeof (struct dos_partition)); 1243 } 1244} 1245 1246static int 1247sanitize_partition(struct dos_partition *partp) 1248{ 1249 u_int32_t prev_head_boundary, prev_cyl_boundary; 1250 u_int32_t max_end, size, start; 1251 1252 start = partp->dp_start; 1253 size = partp->dp_size; 1254 max_end = start + size; 1255 /* Only allow a zero size if the partition is being marked unused. */ 1256 if (size == 0) { 1257 if (start == 0 && partp->dp_typ == 0) 1258 return (1); 1259 warnx("ERROR: size of partition is zero"); 1260 return (0); 1261 } 1262 /* Return if no adjustment is necessary. */ 1263 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1264 return (1); 1265 1266 if (start % dos_sectors != 0) 1267 warnx("WARNING: partition does not start on a head boundary"); 1268 if ((start +size) % dos_sectors != 0) 1269 warnx("WARNING: partition does not end on a cylinder boundary"); 1270 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1271 if (!ok("Correct this automatically?")) 1272 return (1); 1273 1274 /* 1275 * Adjust start upwards, if necessary, to fall on an head boundary. 1276 */ 1277 if (start % dos_sectors != 0) { 1278 prev_head_boundary = start / dos_sectors * dos_sectors; 1279 if (max_end < dos_sectors || 1280 prev_head_boundary >= max_end - dos_sectors) { 1281 /* 1282 * Can't go past end of partition 1283 */ 1284 warnx( 1285 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1286 return (0); 1287 } 1288 start = prev_head_boundary + dos_sectors; 1289 } 1290 1291 /* 1292 * Adjust size downwards, if necessary, to fall on a cylinder 1293 * boundary. 1294 */ 1295 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1296 if (prev_cyl_boundary > start) 1297 size = prev_cyl_boundary - start; 1298 else { 1299 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1300 and end on a cylinder boundary."); 1301 return (0); 1302 } 1303 1304 /* Finally, commit any changes to partp and return. */ 1305 if (start != partp->dp_start) { 1306 warnx("WARNING: adjusting start offset of partition to %u", 1307 (u_int)start); 1308 partp->dp_start = start; 1309 } 1310 if (size != partp->dp_size) { 1311 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1312 partp->dp_size = size; 1313 } 1314 1315 return (1); 1316} 1317 1318/* 1319 * Try figuring out the root device's canonical disk name. 1320 * The following choices are considered: 1321 * /dev/ad0s1a => /dev/ad0 1322 * /dev/da0a => /dev/da0 1323 * /dev/vinum/root => /dev/vinum/root 1324 */ 1325static char * 1326get_rootdisk(void) 1327{ 1328 struct statfs rootfs; 1329 regex_t re; 1330#define NMATCHES 2 1331 regmatch_t rm[NMATCHES]; 1332 char *s; 1333 int rv; 1334 1335 if (statfs("/", &rootfs) == -1) 1336 err(1, "statfs(\"/\")"); 1337 1338 if ((rv = regcomp(&re, "^(/dev/.*)(\\d+(s\\d+)?[a-h])?$", 1339 REG_EXTENDED)) != 0) 1340 errx(1, "regcomp() failed (%d)", rv); 1341 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1342 errx(1, 1343"mounted root fs resource doesn't match expectations (regexec returned %d)", 1344 rv); 1345 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1346 errx(1, "out of memory"); 1347 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1348 rm[1].rm_eo - rm[1].rm_so); 1349 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1350 1351 return s; 1352} 1353