fdisk.c revision 103665
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 103665 2002-09-20 08:12:51Z phk $"; 30#endif /* not lint */ 31 32#include <sys/disk.h> 33#include <sys/disklabel.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 <paths.h> 42#include <regex.h> 43#include <stdint.h> 44#include <stdio.h> 45#include <stdlib.h> 46#include <string.h> 47#include <unistd.h> 48 49int iotest; 50 51#define LBUF 100 52static char lbuf[LBUF]; 53 54#define MBRSIGOFF 510 55 56/* 57 * 58 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 59 * 60 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 61 * Copyright (c) 1989 Robert. V. Baron 62 * Created. 63 */ 64 65#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 66 67#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 68 69#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 70#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 71static int secsize = 0; /* the sensed sector size */ 72 73static char *disk; 74 75static struct disklabel disklabel; /* disk parameters */ 76 77static int cyls, sectors, heads, cylsecs, disksecs; 78 79struct mboot { 80 unsigned char padding[2]; /* force the longs to be long aligned */ 81 unsigned char *bootinst; /* boot code */ 82 off_t bootinst_size; 83 struct dos_partition parts[4]; 84}; 85 86static struct mboot mboot; 87static int fd; 88 89#define ACTIVE 0x80 90#define BOOT_MAGIC 0xAA55 91 92static uint dos_cyls; 93static uint dos_heads; 94static uint dos_sectors; 95static uint dos_cylsecs; 96 97#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 98#define DOSCYL(c) (c & 0xff) 99 100#define MAX_ARGS 10 101 102static int current_line_number; 103 104static int geom_processed = 0; 105static int part_processed = 0; 106static int active_processed = 0; 107 108typedef struct cmd { 109 char cmd; 110 int n_args; 111 struct arg { 112 char argtype; 113 int arg_val; 114 } args[MAX_ARGS]; 115} CMD; 116 117static int B_flag = 0; /* replace boot code */ 118static int I_flag = 0; /* use entire disk for FreeBSD */ 119static int a_flag = 0; /* set active partition */ 120static char *b_flag = NULL; /* path to boot code */ 121static int i_flag = 0; /* replace partition data */ 122static int u_flag = 0; /* update partition data */ 123static int s_flag = 0; /* Print a summary and exit */ 124static int t_flag = 0; /* test only */ 125static char *f_flag = NULL; /* Read config info from file */ 126static int v_flag = 0; /* Be verbose */ 127 128static struct part_type 129{ 130 unsigned char type; 131 const char *name; 132} part_types[] = { 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 'big' DOS (>= 32MB)"} 140 ,{0x07, "OS/2 HPFS, NTFS, 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 ,{0x24, "NEC DOS"} 156 ,{0x3C, "PartitionMagic recovery"} 157 ,{0x39, "plan9"} 158 ,{0x40, "VENIX 286"} 159 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 160 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 161 ,{0x43, "Linux native (sharing disk with DRDOS)"} 162 ,{0x4D, "QNX 4.2 Primary"} 163 ,{0x4E, "QNX 4.2 Secondary"} 164 ,{0x4F, "QNX 4.2 Tertiary"} 165 ,{0x50, "DM (disk manager)"} 166 ,{0x51, "DM6 Aux1 (or Novell)"} 167 ,{0x52, "CP/M or Microport SysV/AT"} 168 ,{0x53, "DM6 Aux3"} 169 ,{0x54, "DM6"} 170 ,{0x55, "EZ-Drive (disk manager)"} 171 ,{0x56, "Golden Bow (disk manager)"} 172 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 173 ,{0x61, "SpeedStor"} 174 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"} 175 ,{0x64, "Novell Netware/286 2.xx"} 176 ,{0x65, "Novell Netware/386 3.xx"} 177 ,{0x70, "DiskSecure Multi-Boot"} 178 ,{0x75, "PCIX"} 179 ,{0x77, "QNX4.x"} 180 ,{0x78, "QNX4.x 2nd part"} 181 ,{0x79, "QNX4.x 3rd part"} 182 ,{0x80, "Minix until 1.4a"} 183 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"} 184 ,{0x82, "Linux swap or Solaris x86"} 185 ,{0x83, "Linux native"} 186 ,{0x84, "OS/2 hidden C: drive"} 187 ,{0x85, "Linux extended"} 188 ,{0x86, "NTFS volume set??"} 189 ,{0x87, "NTFS volume set??"} 190 ,{0x93, "Amoeba file system"} 191 ,{0x94, "Amoeba bad block table"} 192 ,{0x9F, "BSD/OS"} 193 ,{0xA0, "Suspend to Disk"} 194 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 195 ,{0xA6, "OpenBSD"} 196 ,{0xA7, "NeXTSTEP"} 197 ,{0xA9, "NetBSD"} 198 ,{0xAC, "IBM JFS"} 199 ,{0xB7, "BSDI BSD/386 file system"} 200 ,{0xB8, "BSDI BSD/386 swap"} 201 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 202 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 203 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 204 ,{0xC7, "Syrinx"} 205 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 206 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 207 ,{0xE3, "DOS R/O or SpeedStor"} 208 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 209 ,{0xEB, "BeOS file system"} 210 ,{0xEE, "EFI GPT"} 211 ,{0xEF, "EFI System Partition"} 212 ,{0xF1, "SpeedStor"} 213 ,{0xF2, "DOS 3.3+ Secondary"} 214 ,{0xF4, "SpeedStor large partition"} 215 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 216 ,{0xFF, "Xenix bad blocks table"} 217}; 218 219static void print_s0(int which); 220static void print_part(int i); 221static void init_sector0(unsigned long start); 222static void init_boot(void); 223static void change_part(int i); 224static void print_params(void); 225static void change_active(int which); 226static void change_code(void); 227static void get_params_to_use(void); 228static char *get_rootdisk(void); 229static void dos(struct dos_partition *partp); 230static int open_disk(int flag); 231static ssize_t read_disk(off_t sector, void *buf); 232static ssize_t write_disk(off_t sector, void *buf); 233static int get_params(void); 234static int read_s0(void); 235static int write_s0(void); 236static int ok(const char *str); 237static int decimal(const char *str, int *num, int deflt); 238static const char *get_type(int type); 239static int read_config(char *config_file); 240static void reset_boot(void); 241static int sanitize_partition(struct dos_partition *); 242static void usage(void); 243 244int 245main(int argc, char *argv[]) 246{ 247 struct stat sb; 248 int c, i; 249 int partition = -1; 250 struct dos_partition *partp; 251 252 while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1) 253 switch (c) { 254 case 'B': 255 B_flag = 1; 256 break; 257 case 'I': 258 I_flag = 1; 259 break; 260 case 'a': 261 a_flag = 1; 262 break; 263 case 'b': 264 b_flag = optarg; 265 break; 266 case 'f': 267 f_flag = optarg; 268 break; 269 case 'i': 270 i_flag = 1; 271 break; 272 case 's': 273 s_flag = 1; 274 break; 275 case 't': 276 t_flag = 1; 277 break; 278 case 'u': 279 u_flag = 1; 280 break; 281 case 'v': 282 v_flag = 1; 283 break; 284 case '1': 285 case '2': 286 case '3': 287 case '4': 288 partition = c - '0'; 289 break; 290 default: 291 usage(); 292 } 293 if (f_flag || i_flag) 294 u_flag = 1; 295 if (t_flag) 296 v_flag = 1; 297 argc -= optind; 298 argv += optind; 299 300 if (argc == 0) { 301 disk = get_rootdisk(); 302 } else { 303 if (stat(argv[0], &sb) == 0) { 304 /* OK, full pathname given */ 305 disk = argv[0]; 306 } else if (errno == ENOENT) { 307 /* Try prepending "/dev" */ 308 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 309 if (disk == NULL) 310 errx(1, "out of memory"); 311 } else { 312 /* other stat error, let it fail below */ 313 disk = argv[0]; 314 } 315 } 316 if (open_disk(u_flag) < 0) 317 err(1, "cannot open disk %s", disk); 318 319 /* (abu)use mboot.bootinst to probe for the sector size */ 320 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 321 err(1, "cannot allocate buffer to determine disk sector size"); 322 read_disk(0, mboot.bootinst); 323 free(mboot.bootinst); 324 mboot.bootinst = NULL; 325 326 if (s_flag) { 327 if (read_s0()) 328 err(1, "read_s0"); 329 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 330 dos_sectors); 331 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 332 for (i = 0; i < NDOSPART; i++) { 333 partp = ((struct dos_partition *) &mboot.parts) + i; 334 if (partp->dp_start == 0 && partp->dp_size == 0) 335 continue; 336 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 337 (u_long) partp->dp_start, 338 (u_long) partp->dp_size, partp->dp_typ, 339 partp->dp_flag); 340 } 341 exit(0); 342 } 343 344 printf("******* Working on device %s *******\n",disk); 345 346 if (I_flag) { 347 read_s0(); 348 reset_boot(); 349 partp = (struct dos_partition *) (&mboot.parts[0]); 350 partp->dp_typ = DOSPTYP_386BSD; 351 partp->dp_flag = ACTIVE; 352 partp->dp_start = dos_sectors; 353 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 354 dos_sectors; 355 dos(partp); 356 if (v_flag) 357 print_s0(-1); 358 if (!t_flag) 359 write_s0(); 360 exit(0); 361 } 362 if (f_flag) { 363 if (read_s0() || i_flag) 364 reset_boot(); 365 if (!read_config(f_flag)) 366 exit(1); 367 if (v_flag) 368 print_s0(-1); 369 if (!t_flag) 370 write_s0(); 371 } else { 372 if(u_flag) 373 get_params_to_use(); 374 else 375 print_params(); 376 377 if (read_s0()) 378 init_sector0(dos_sectors); 379 380 printf("Media sector size is %d\n", secsize); 381 printf("Warning: BIOS sector numbering starts with sector 1\n"); 382 printf("Information from DOS bootblock is:\n"); 383 if (partition == -1) 384 for (i = 1; i <= NDOSPART; i++) 385 change_part(i); 386 else 387 change_part(partition); 388 389 if (u_flag || a_flag) 390 change_active(partition); 391 392 if (B_flag) 393 change_code(); 394 395 if (u_flag || a_flag || B_flag) { 396 if (!t_flag) { 397 printf("\nWe haven't changed the partition table yet. "); 398 printf("This is your last chance.\n"); 399 } 400 print_s0(-1); 401 if (!t_flag) { 402 if (ok("Should we write new partition table?")) 403 write_s0(); 404 } else { 405 printf("\n-t flag specified -- partition table not written.\n"); 406 } 407 } 408 } 409 410 exit(0); 411} 412 413static void 414usage() 415{ 416 fprintf(stderr, "%s%s", 417 "usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n", 418 " fdisk -f configfile [-itv] [disk]\n"); 419 exit(1); 420} 421 422static void 423print_s0(int which) 424{ 425 int i; 426 427 print_params(); 428 printf("Information from DOS bootblock is:\n"); 429 if (which == -1) 430 for (i = 1; i <= NDOSPART; i++) 431 printf("%d: ", i), print_part(i); 432 else 433 print_part(which); 434} 435 436static struct dos_partition mtpart; 437 438static void 439print_part(int i) 440{ 441 struct dos_partition *partp; 442 u_int64_t part_mb; 443 444 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 445 446 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 447 printf("<UNUSED>\n"); 448 return; 449 } 450 /* 451 * Be careful not to overflow. 452 */ 453 part_mb = partp->dp_size; 454 part_mb *= secsize; 455 part_mb /= (1024 * 1024); 456 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 457 get_type(partp->dp_typ)); 458 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 459 (u_long)partp->dp_start, 460 (u_long)partp->dp_size, 461 (uintmax_t)part_mb, 462 partp->dp_flag, 463 partp->dp_flag == ACTIVE ? " (active)" : ""); 464 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 465 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 466 ,partp->dp_shd 467 ,DPSECT(partp->dp_ssect) 468 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 469 ,partp->dp_ehd 470 ,DPSECT(partp->dp_esect)); 471} 472 473 474static void 475init_boot(void) 476{ 477#ifndef __ia64__ 478 const char *fname; 479 int fdesc, n; 480 struct stat sb; 481 482 fname = b_flag ? b_flag : "/boot/mbr"; 483 if ((fdesc = open(fname, O_RDONLY)) == -1 || 484 fstat(fdesc, &sb) == -1) 485 err(1, "%s", fname); 486 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 487 errx(1, "%s: length must be a multiple of sector size", fname); 488 if (mboot.bootinst != NULL) 489 free(mboot.bootinst); 490 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 491 errx(1, "%s: unable to allocate read buffer", fname); 492 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 493 close(fdesc)) 494 err(1, "%s", fname); 495 if (n != mboot.bootinst_size) 496 errx(1, "%s: short read", fname); 497#else 498 if (mboot.bootinst != NULL) 499 free(mboot.bootinst); 500 mboot.bootinst_size = secsize; 501 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 502 errx(1, "unable to allocate boot block buffer"); 503 memset(mboot.bootinst, 0, mboot.bootinst_size); 504 *(uint16_t *)(void *)&mboot.bootinst[MBRSIGOFF] = BOOT_MAGIC; 505#endif 506} 507 508 509static void 510init_sector0(unsigned long start) 511{ 512 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]); 513 514 init_boot(); 515 516 partp->dp_typ = DOSPTYP_386BSD; 517 partp->dp_flag = ACTIVE; 518 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 519 if(start == 0) 520 start = dos_sectors; 521 partp->dp_start = start; 522 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 523 524 dos(partp); 525} 526 527static void 528change_part(int i) 529{ 530 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 531 532 printf("The data for partition %d is:\n", i); 533 print_part(i); 534 535 if (u_flag && ok("Do you want to change it?")) { 536 int tmp; 537 538 if (i_flag) { 539 bzero((char *)partp, sizeof (struct dos_partition)); 540 if (i == 4) { 541 init_sector0(1); 542 printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n"); 543 print_part(i); 544 } 545 } 546 547 do { 548 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 549 Decimal("start", partp->dp_start, tmp); 550 Decimal("size", partp->dp_size, tmp); 551 if (!sanitize_partition(partp)) { 552 warnx("ERROR: failed to adjust; setting sysid to 0"); 553 partp->dp_typ = 0; 554 } 555 556 if (ok("Explicitly specify beg/end address ?")) 557 { 558 int tsec,tcyl,thd; 559 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 560 thd = partp->dp_shd; 561 tsec = DPSECT(partp->dp_ssect); 562 Decimal("beginning cylinder", tcyl, tmp); 563 Decimal("beginning head", thd, tmp); 564 Decimal("beginning sector", tsec, tmp); 565 partp->dp_scyl = DOSCYL(tcyl); 566 partp->dp_ssect = DOSSECT(tsec,tcyl); 567 partp->dp_shd = thd; 568 569 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 570 thd = partp->dp_ehd; 571 tsec = DPSECT(partp->dp_esect); 572 Decimal("ending cylinder", tcyl, tmp); 573 Decimal("ending head", thd, tmp); 574 Decimal("ending sector", tsec, tmp); 575 partp->dp_ecyl = DOSCYL(tcyl); 576 partp->dp_esect = DOSSECT(tsec,tcyl); 577 partp->dp_ehd = thd; 578 } else 579 dos(partp); 580 581 print_part(i); 582 } while (!ok("Are we happy with this entry?")); 583 } 584 } 585 586static void 587print_params() 588{ 589 printf("parameters extracted from in-core disklabel are:\n"); 590 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 591 ,cyls,heads,sectors,cylsecs); 592 if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255)) 593 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 594 printf("parameters to be used for BIOS calculations are:\n"); 595 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 596 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 597} 598 599static void 600change_active(int which) 601{ 602 struct dos_partition *partp = &mboot.parts[0]; 603 int active, i, new, tmp; 604 605 active = -1; 606 for (i = 0; i < NDOSPART; i++) { 607 if ((partp[i].dp_flag & ACTIVE) == 0) 608 continue; 609 printf("Partition %d is marked active\n", i + 1); 610 if (active == -1) 611 active = i + 1; 612 } 613 if (a_flag && which != -1) 614 active = which; 615 else if (active == -1) 616 active = 1; 617 618 if (!ok("Do you want to change the active partition?")) 619 return; 620setactive: 621 do { 622 new = active; 623 Decimal("active partition", new, tmp); 624 if (new < 1 || new > 4) { 625 printf("Active partition number must be in range 1-4." 626 " Try again.\n"); 627 goto setactive; 628 } 629 active = new; 630 } while (!ok("Are you happy with this choice")); 631 for (i = 0; i < NDOSPART; i++) 632 partp[i].dp_flag = 0; 633 if (active > 0 && active <= NDOSPART) 634 partp[active-1].dp_flag = ACTIVE; 635} 636 637static void 638change_code() 639{ 640 if (ok("Do you want to change the boot code?")) 641 init_boot(); 642} 643 644void 645get_params_to_use() 646{ 647 int tmp; 648 print_params(); 649 if (ok("Do you want to change our idea of what BIOS thinks ?")) 650 { 651 do 652 { 653 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 654 Decimal("BIOS's idea of #heads", dos_heads, tmp); 655 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 656 dos_cylsecs = dos_heads * dos_sectors; 657 print_params(); 658 } 659 while(!ok("Are you happy with this choice")); 660 } 661} 662 663 664/***********************************************\ 665* Change real numbers into strange dos numbers * 666\***********************************************/ 667static void 668dos(struct dos_partition *partp) 669{ 670 int cy, sec; 671 u_int32_t end; 672 673 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 674 memcpy(partp, &mtpart, sizeof(*partp)); 675 return; 676 } 677 678 /* Start c/h/s. */ 679 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 680 cy = partp->dp_start / dos_cylsecs; 681 sec = partp->dp_start % dos_sectors + 1; 682 partp->dp_scyl = DOSCYL(cy); 683 partp->dp_ssect = DOSSECT(sec, cy); 684 685 /* End c/h/s. */ 686 end = partp->dp_start + partp->dp_size - 1; 687 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 688 cy = end / dos_cylsecs; 689 sec = end % dos_sectors + 1; 690 partp->dp_ecyl = DOSCYL(cy); 691 partp->dp_esect = DOSSECT(sec, cy); 692} 693 694static int 695open_disk(int flag) 696{ 697 struct stat st; 698 699 if (stat(disk, &st) == -1) { 700 if (errno == ENOENT) 701 return -2; 702 warnx("can't get file status of %s", disk); 703 return -1; 704 } 705 if ( !(st.st_mode & S_IFCHR) ) 706 warnx("device %s is not character special", disk); 707 if ((fd = open(disk, 708 a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY)) == -1) { 709 if(errno == ENXIO) 710 return -2; 711 warnx("can't open device %s", disk); 712 return -1; 713 } 714 if (get_params() == -1) { 715 warnx("can't get disk parameters on %s", disk); 716 return -1; 717 } 718 return fd; 719} 720 721static ssize_t 722read_disk(off_t sector, void *buf) 723{ 724 lseek(fd,(sector * 512), 0); 725 if( secsize == 0 ) 726 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 727 { 728 /* try the read */ 729 int size = read(fd, buf, secsize); 730 if( size == secsize ) 731 /* it worked so return */ 732 return secsize; 733 } 734 else 735 return read( fd, buf, secsize ); 736 737 /* we failed to read at any of the sizes */ 738 return -1; 739} 740 741static ssize_t 742write_disk(off_t sector, void *buf) 743{ 744 lseek(fd,(sector * 512), 0); 745 /* write out in the size that the read_disk found worked */ 746 return write(fd, buf, secsize); 747} 748 749static int 750get_params() 751{ 752 int error; 753 u_int u; 754 off_t o; 755 756 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 757 warnx("can't get disk parameters on %s; supplying dummy ones", disk); 758 dos_cyls = cyls = 1; 759 dos_heads = heads = 1; 760 dos_sectors = sectors = 1; 761 dos_cylsecs = cylsecs = heads * sectors; 762 disksecs = cyls * heads * sectors; 763 } else { 764 dos_cyls = cyls = disklabel.d_ncylinders; 765 dos_heads = heads = disklabel.d_ntracks; 766 dos_sectors = sectors = disklabel.d_nsectors; 767 } 768 error = ioctl(fd, DIOCGFWSECTORS, &u); 769 if (error == 0) 770 sectors = dos_sectors = u; 771 error = ioctl(fd, DIOCGFWHEADS, &u); 772 if (error == 0) 773 heads = dos_heads = u; 774 775 dos_cylsecs = cylsecs = heads * sectors; 776 disksecs = cyls * heads * sectors; 777 778 error = ioctl(fd, DIOCGSECTORSIZE, &u); 779 if (error != 0) 780 u = 512; 781 782 error = ioctl(fd, DIOCGMEDIASIZE, &o); 783 if (error == 0) { 784 disksecs = o / u; 785 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 786 } 787 788 789 return (disksecs); 790} 791 792 793static int 794read_s0() 795{ 796 mboot.bootinst_size = secsize; 797 if (mboot.bootinst != NULL) 798 free(mboot.bootinst); 799 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 800 warnx("unable to allocate buffer to read fdisk " 801 "partition table"); 802 return -1; 803 } 804 if (read_disk(0, mboot.bootinst) == -1) { 805 warnx("can't read fdisk partition table"); 806 return -1; 807 } 808 if (*(uint16_t *)(void *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 809 warnx("invalid fdisk partition table found"); 810 /* So should we initialize things */ 811 return -1; 812 } 813 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 814 return 0; 815} 816 817static int 818write_s0() 819{ 820 int sector; 821 822 if (iotest) { 823 print_s0(-1); 824 return 0; 825 } 826 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 827 /* 828 * write enable label sector before write (if necessary), 829 * disable after writing. 830 * needed if the disklabel protected area also protects 831 * sector 0. (e.g. empty disk) 832 */ 833 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 834 if (write_disk(sector, 835 &mboot.bootinst[sector * secsize]) == -1) { 836 warn("can't write fdisk partition table"); 837 return -1; 838 } 839 return(0); 840} 841 842 843static int 844ok(const char *str) 845{ 846 printf("%s [n] ", str); 847 fflush(stdout); 848 if (fgets(lbuf, LBUF, stdin) == NULL) 849 exit(1); 850 lbuf[strlen(lbuf)-1] = 0; 851 852 if (*lbuf && 853 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 854 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 855 return 1; 856 else 857 return 0; 858} 859 860static int 861decimal(const char *str, int *num, int deflt) 862{ 863 int acc = 0, c; 864 char *cp; 865 866 while (1) { 867 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 868 fflush(stdout); 869 if (fgets(lbuf, LBUF, stdin) == NULL) 870 exit(1); 871 lbuf[strlen(lbuf)-1] = 0; 872 873 if (!*lbuf) 874 return 0; 875 876 cp = lbuf; 877 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 878 if (!c) 879 return 0; 880 while ((c = *cp++)) { 881 if (c <= '9' && c >= '0') 882 acc = acc * 10 + c - '0'; 883 else 884 break; 885 } 886 if (c == ' ' || c == '\t') 887 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 888 if (!c) { 889 *num = acc; 890 return 1; 891 } else 892 printf("%s is an invalid decimal number. Try again.\n", 893 lbuf); 894 } 895 896} 897 898static const char * 899get_type(int type) 900{ 901 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 902 int counter = 0; 903 struct part_type *ptr = part_types; 904 905 906 while(counter < numentries) { 907 if(ptr->type == type) 908 return(ptr->name); 909 ptr++; 910 counter++; 911 } 912 return("unknown"); 913} 914 915 916static void 917parse_config_line(char *line, CMD *command) 918{ 919 char *cp, *end; 920 921 cp = line; 922 while (1) { 923 memset(command, 0, sizeof(*command)); 924 925 while (isspace(*cp)) ++cp; 926 if (*cp == '\0' || *cp == '#') 927 break; 928 command->cmd = *cp++; 929 930 /* 931 * Parse args 932 */ 933 while (1) { 934 while (isspace(*cp)) ++cp; 935 if (*cp == '#') 936 break; /* found comment */ 937 if (isalpha(*cp)) 938 command->args[command->n_args].argtype = *cp++; 939 if (!isdigit(*cp)) 940 break; /* assume end of line */ 941 end = NULL; 942 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 943 if (cp == end) 944 break; /* couldn't parse number */ 945 cp = end; 946 command->n_args++; 947 } 948 break; 949 } 950} 951 952 953static int 954process_geometry(CMD *command) 955{ 956 int status = 1, i; 957 958 while (1) { 959 geom_processed = 1; 960 if (part_processed) { 961 warnx( 962 "ERROR line %d: the geometry specification line must occur before\n\ 963 all partition specifications", 964 current_line_number); 965 status = 0; 966 break; 967 } 968 if (command->n_args != 3) { 969 warnx("ERROR line %d: incorrect number of geometry args", 970 current_line_number); 971 status = 0; 972 break; 973 } 974 dos_cyls = 0; 975 dos_heads = 0; 976 dos_sectors = 0; 977 for (i = 0; i < 3; ++i) { 978 switch (command->args[i].argtype) { 979 case 'c': 980 dos_cyls = command->args[i].arg_val; 981 break; 982 case 'h': 983 dos_heads = command->args[i].arg_val; 984 break; 985 case 's': 986 dos_sectors = command->args[i].arg_val; 987 break; 988 default: 989 warnx( 990 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 991 current_line_number, command->args[i].argtype, 992 command->args[i].argtype); 993 status = 0; 994 break; 995 } 996 } 997 if (status == 0) 998 break; 999 1000 dos_cylsecs = dos_heads * dos_sectors; 1001 1002 /* 1003 * Do sanity checks on parameter values 1004 */ 1005 if (dos_cyls == 0) { 1006 warnx("ERROR line %d: number of cylinders not specified", 1007 current_line_number); 1008 status = 0; 1009 } 1010 if (dos_cyls > 1024) { 1011 warnx( 1012 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1013 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1014 is dedicated to FreeBSD)", 1015 current_line_number, dos_cyls); 1016 } 1017 1018 if (dos_heads == 0) { 1019 warnx("ERROR line %d: number of heads not specified", 1020 current_line_number); 1021 status = 0; 1022 } else if (dos_heads > 256) { 1023 warnx("ERROR line %d: number of heads must be within (1-256)", 1024 current_line_number); 1025 status = 0; 1026 } 1027 1028 if (dos_sectors == 0) { 1029 warnx("ERROR line %d: number of sectors not specified", 1030 current_line_number); 1031 status = 0; 1032 } else if (dos_sectors > 63) { 1033 warnx("ERROR line %d: number of sectors must be within (1-63)", 1034 current_line_number); 1035 status = 0; 1036 } 1037 1038 break; 1039 } 1040 return (status); 1041} 1042 1043 1044static int 1045process_partition(CMD *command) 1046{ 1047 int status = 0, partition; 1048 u_int32_t prev_head_boundary, prev_cyl_boundary; 1049 u_int32_t adj_size, max_end; 1050 struct dos_partition *partp; 1051 1052 while (1) { 1053 part_processed = 1; 1054 if (command->n_args != 4) { 1055 warnx("ERROR line %d: incorrect number of partition args", 1056 current_line_number); 1057 break; 1058 } 1059 partition = command->args[0].arg_val; 1060 if (partition < 1 || partition > 4) { 1061 warnx("ERROR line %d: invalid partition number %d", 1062 current_line_number, partition); 1063 break; 1064 } 1065 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1066 bzero((char *)partp, sizeof (struct dos_partition)); 1067 partp->dp_typ = command->args[1].arg_val; 1068 partp->dp_start = command->args[2].arg_val; 1069 partp->dp_size = command->args[3].arg_val; 1070 max_end = partp->dp_start + partp->dp_size; 1071 1072 if (partp->dp_typ == 0) { 1073 /* 1074 * Get out, the partition is marked as unused. 1075 */ 1076 /* 1077 * Insure that it's unused. 1078 */ 1079 bzero((char *)partp, sizeof (struct dos_partition)); 1080 status = 1; 1081 break; 1082 } 1083 1084 /* 1085 * Adjust start upwards, if necessary, to fall on an head boundary. 1086 */ 1087 if (partp->dp_start % dos_sectors != 0) { 1088 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1089 if (max_end < dos_sectors || 1090 prev_head_boundary > max_end - dos_sectors) { 1091 /* 1092 * Can't go past end of partition 1093 */ 1094 warnx( 1095 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1096 a head boundary", 1097 current_line_number, partition); 1098 break; 1099 } 1100 warnx( 1101 "WARNING: adjusting start offset of partition %d\n\ 1102 from %u to %u, to fall on a head boundary", 1103 partition, (u_int)partp->dp_start, 1104 (u_int)(prev_head_boundary + dos_sectors)); 1105 partp->dp_start = prev_head_boundary + dos_sectors; 1106 } 1107 1108 /* 1109 * Adjust size downwards, if necessary, to fall on a cylinder 1110 * boundary. 1111 */ 1112 prev_cyl_boundary = 1113 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1114 if (prev_cyl_boundary > partp->dp_start) 1115 adj_size = prev_cyl_boundary - partp->dp_start; 1116 else { 1117 warnx( 1118 "ERROR: could not adjust partition to start on a head boundary\n\ 1119 and end on a cylinder boundary."); 1120 return (0); 1121 } 1122 if (adj_size != partp->dp_size) { 1123 warnx( 1124 "WARNING: adjusting size of partition %d from %u to %u\n\ 1125 to end on a cylinder boundary", 1126 partition, (u_int)partp->dp_size, (u_int)adj_size); 1127 partp->dp_size = adj_size; 1128 } 1129 if (partp->dp_size == 0) { 1130 warnx("ERROR line %d: size of partition %d is zero", 1131 current_line_number, partition); 1132 break; 1133 } 1134 1135 dos(partp); 1136 status = 1; 1137 break; 1138 } 1139 return (status); 1140} 1141 1142 1143static int 1144process_active(CMD *command) 1145{ 1146 int status = 0, partition, i; 1147 struct dos_partition *partp; 1148 1149 while (1) { 1150 active_processed = 1; 1151 if (command->n_args != 1) { 1152 warnx("ERROR line %d: incorrect number of active args", 1153 current_line_number); 1154 status = 0; 1155 break; 1156 } 1157 partition = command->args[0].arg_val; 1158 if (partition < 1 || partition > 4) { 1159 warnx("ERROR line %d: invalid partition number %d", 1160 current_line_number, partition); 1161 break; 1162 } 1163 /* 1164 * Reset active partition 1165 */ 1166 partp = ((struct dos_partition *) &mboot.parts); 1167 for (i = 0; i < NDOSPART; i++) 1168 partp[i].dp_flag = 0; 1169 partp[partition-1].dp_flag = ACTIVE; 1170 1171 status = 1; 1172 break; 1173 } 1174 return (status); 1175} 1176 1177 1178static int 1179process_line(char *line) 1180{ 1181 CMD command; 1182 int status = 1; 1183 1184 while (1) { 1185 parse_config_line(line, &command); 1186 switch (command.cmd) { 1187 case 0: 1188 /* 1189 * Comment or blank line 1190 */ 1191 break; 1192 case 'g': 1193 /* 1194 * Set geometry 1195 */ 1196 status = process_geometry(&command); 1197 break; 1198 case 'p': 1199 status = process_partition(&command); 1200 break; 1201 case 'a': 1202 status = process_active(&command); 1203 break; 1204 default: 1205 status = 0; 1206 break; 1207 } 1208 break; 1209 } 1210 return (status); 1211} 1212 1213 1214static int 1215read_config(char *config_file) 1216{ 1217 FILE *fp = NULL; 1218 int status = 1; 1219 char buf[1010]; 1220 1221 while (1) { 1222 if (strcmp(config_file, "-") != 0) { 1223 /* 1224 * We're not reading from stdin 1225 */ 1226 if ((fp = fopen(config_file, "r")) == NULL) { 1227 status = 0; 1228 break; 1229 } 1230 } else { 1231 fp = stdin; 1232 } 1233 current_line_number = 0; 1234 while (!feof(fp)) { 1235 if (fgets(buf, sizeof(buf), fp) == NULL) 1236 break; 1237 ++current_line_number; 1238 status = process_line(buf); 1239 if (status == 0) 1240 break; 1241 } 1242 break; 1243 } 1244 if (fp) { 1245 /* 1246 * It doesn't matter if we're reading from stdin, as we've reached EOF 1247 */ 1248 fclose(fp); 1249 } 1250 return (status); 1251} 1252 1253 1254static void 1255reset_boot(void) 1256{ 1257 int i; 1258 struct dos_partition *partp; 1259 1260 init_boot(); 1261 for (i = 0; i < 4; ++i) { 1262 partp = ((struct dos_partition *) &mboot.parts) + i; 1263 bzero((char *)partp, sizeof (struct dos_partition)); 1264 } 1265} 1266 1267static int 1268sanitize_partition(struct dos_partition *partp) 1269{ 1270 u_int32_t prev_head_boundary, prev_cyl_boundary; 1271 u_int32_t max_end, size, start; 1272 1273 start = partp->dp_start; 1274 size = partp->dp_size; 1275 max_end = start + size; 1276 /* Only allow a zero size if the partition is being marked unused. */ 1277 if (size == 0) { 1278 if (start == 0 && partp->dp_typ == 0) 1279 return (1); 1280 warnx("ERROR: size of partition is zero"); 1281 return (0); 1282 } 1283 /* Return if no adjustment is necessary. */ 1284 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1285 return (1); 1286 1287 if (start % dos_sectors != 0) 1288 warnx("WARNING: partition does not start on a head boundary"); 1289 if ((start +size) % dos_sectors != 0) 1290 warnx("WARNING: partition does not end on a cylinder boundary"); 1291 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1292 if (!ok("Correct this automatically?")) 1293 return (1); 1294 1295 /* 1296 * Adjust start upwards, if necessary, to fall on an head boundary. 1297 */ 1298 if (start % dos_sectors != 0) { 1299 prev_head_boundary = start / dos_sectors * dos_sectors; 1300 if (max_end < dos_sectors || 1301 prev_head_boundary >= max_end - dos_sectors) { 1302 /* 1303 * Can't go past end of partition 1304 */ 1305 warnx( 1306 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1307 return (0); 1308 } 1309 start = prev_head_boundary + dos_sectors; 1310 } 1311 1312 /* 1313 * Adjust size downwards, if necessary, to fall on a cylinder 1314 * boundary. 1315 */ 1316 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1317 if (prev_cyl_boundary > start) 1318 size = prev_cyl_boundary - start; 1319 else { 1320 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1321 and end on a cylinder boundary."); 1322 return (0); 1323 } 1324 1325 /* Finally, commit any changes to partp and return. */ 1326 if (start != partp->dp_start) { 1327 warnx("WARNING: adjusting start offset of partition to %u", 1328 (u_int)start); 1329 partp->dp_start = start; 1330 } 1331 if (size != partp->dp_size) { 1332 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1333 partp->dp_size = size; 1334 } 1335 1336 return (1); 1337} 1338 1339/* 1340 * Try figuring out the root device's canonical disk name. 1341 * The following choices are considered: 1342 * /dev/ad0s1a => /dev/ad0 1343 * /dev/da0a => /dev/da0 1344 * /dev/vinum/root => /dev/vinum/root 1345 */ 1346static char * 1347get_rootdisk(void) 1348{ 1349 struct statfs rootfs; 1350 regex_t re; 1351#define NMATCHES 2 1352 regmatch_t rm[NMATCHES]; 1353 char *s; 1354 int rv; 1355 1356 if (statfs("/", &rootfs) == -1) 1357 err(1, "statfs(\"/\")"); 1358 1359 if ((rv = regcomp(&re, "^(/dev/.*)(\\d+(s\\d+)?[a-h])?$", 1360 REG_EXTENDED)) != 0) 1361 errx(1, "regcomp() failed (%d)", rv); 1362 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1363 errx(1, 1364"mounted root fs resource doesn't match expectations (regexec returned %d)", 1365 rv); 1366 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1367 errx(1, "out of memory"); 1368 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1369 rm[1].rm_eo - rm[1].rm_so); 1370 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1371 1372 return s; 1373} 1374