fdisk.c revision 112826
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 112826 2003-03-29 22:06:52Z phk $"; 30#endif /* not lint */ 31 32#include <sys/disk.h> 33#include <sys/disklabel.h> 34#include <sys/diskmbr.h> 35#include <sys/param.h> 36#include <sys/stat.h> 37#include <sys/mount.h> 38#include <ctype.h> 39#include <fcntl.h> 40#include <err.h> 41#include <errno.h> 42#include <paths.h> 43#include <regex.h> 44#include <stdint.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <string.h> 48#include <unistd.h> 49 50int iotest; 51 52#define LBUF 100 53static char lbuf[LBUF]; 54 55#define MBRSIGOFF 510 56 57/* 58 * 59 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 60 * 61 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 62 * Copyright (c) 1989 Robert. V. Baron 63 * Created. 64 */ 65 66#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 67 68#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 69 70#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 71#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 72static int secsize = 0; /* the sensed sector size */ 73 74static char *disk; 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, fdw; 87 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 int rwmode, p; 699 char *s; 700 701 fdw = -1; 702 if (stat(disk, &st) == -1) { 703 if (errno == ENOENT) 704 return -2; 705 warnx("can't get file status of %s", disk); 706 return -1; 707 } 708 if ( !(st.st_mode & S_IFCHR) ) 709 warnx("device %s is not character special", disk); 710 rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY; 711 fd = open(disk, rwmode); 712 if (fd == -1 && errno == ENXIO) 713 return -2; 714 if (fd == -1 && errno == EPERM && rwmode == O_RDWR) { 715 fd = open(disk, O_RDONLY); 716 if (fd == -1) 717 return -3; 718 for (p = 1; p < 5; p++) { 719 asprintf(&s, "%ss%d", disk, p); 720 fdw = open(s, O_RDONLY); 721 free(s); 722 if (fdw == -1) 723 continue; 724 break; 725 } 726 if (fdw == -1) 727 return -4; 728 } 729 if (fd == -1) { 730 warnx("can't open device %s", disk); 731 return -1; 732 } 733 if (get_params() == -1) { 734 warnx("can't get disk parameters on %s", disk); 735 return -1; 736 } 737 return fd; 738} 739 740static ssize_t 741read_disk(off_t sector, void *buf) 742{ 743 lseek(fd,(sector * 512), 0); 744 if( secsize == 0 ) 745 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 746 { 747 /* try the read */ 748 int size = read(fd, buf, secsize); 749 if( size == secsize ) 750 /* it worked so return */ 751 return secsize; 752 } 753 else 754 return read( fd, buf, secsize ); 755 756 /* we failed to read at any of the sizes */ 757 return -1; 758} 759 760static ssize_t 761write_disk(off_t sector, void *buf) 762{ 763 764 if (fdw != -1) { 765 return ioctl(fdw, DIOCSMBR, buf); 766 } else { 767 lseek(fd,(sector * 512), 0); 768 /* write out in the size that the read_disk found worked */ 769 return write(fd, buf, secsize); 770 } 771} 772 773static int 774get_params() 775{ 776 int error; 777 u_int u; 778 off_t o; 779 780 error = ioctl(fd, DIOCGFWSECTORS, &u); 781 if (error == 0) 782 sectors = dos_sectors = u; 783 else 784 sectors = dos_sectors = 63; 785 786 error = ioctl(fd, DIOCGFWHEADS, &u); 787 if (error == 0) 788 heads = dos_heads = u; 789 else 790 heads = dos_heads = 255; 791 792 dos_cylsecs = cylsecs = heads * sectors; 793 disksecs = cyls * heads * sectors; 794 795 error = ioctl(fd, DIOCGSECTORSIZE, &u); 796 if (error != 0 || u == 0) 797 u = 512; 798 799 error = ioctl(fd, DIOCGMEDIASIZE, &o); 800 if (error == 0) { 801 disksecs = o / u; 802 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 803 } 804 805 return (disksecs); 806} 807 808 809static int 810read_s0() 811{ 812 mboot.bootinst_size = secsize; 813 if (mboot.bootinst != NULL) 814 free(mboot.bootinst); 815 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 816 warnx("unable to allocate buffer to read fdisk " 817 "partition table"); 818 return -1; 819 } 820 if (read_disk(0, mboot.bootinst) == -1) { 821 warnx("can't read fdisk partition table"); 822 return -1; 823 } 824 if (*(uint16_t *)(void *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 825 warnx("invalid fdisk partition table found"); 826 /* So should we initialize things */ 827 return -1; 828 } 829 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 830 return 0; 831} 832 833static int 834write_s0() 835{ 836 int sector; 837 838 if (iotest) { 839 print_s0(-1); 840 return 0; 841 } 842 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 843 /* 844 * write enable label sector before write (if necessary), 845 * disable after writing. 846 * needed if the disklabel protected area also protects 847 * sector 0. (e.g. empty disk) 848 */ 849 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 850 if (write_disk(sector, 851 &mboot.bootinst[sector * secsize]) == -1) { 852 warn("can't write fdisk partition table"); 853 return -1; 854 } 855 return(0); 856} 857 858 859static int 860ok(const char *str) 861{ 862 printf("%s [n] ", str); 863 fflush(stdout); 864 if (fgets(lbuf, LBUF, stdin) == NULL) 865 exit(1); 866 lbuf[strlen(lbuf)-1] = 0; 867 868 if (*lbuf && 869 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 870 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 871 return 1; 872 else 873 return 0; 874} 875 876static int 877decimal(const char *str, int *num, int deflt) 878{ 879 int acc = 0, c; 880 char *cp; 881 882 while (1) { 883 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 884 fflush(stdout); 885 if (fgets(lbuf, LBUF, stdin) == NULL) 886 exit(1); 887 lbuf[strlen(lbuf)-1] = 0; 888 889 if (!*lbuf) 890 return 0; 891 892 cp = lbuf; 893 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 894 if (!c) 895 return 0; 896 while ((c = *cp++)) { 897 if (c <= '9' && c >= '0') 898 acc = acc * 10 + c - '0'; 899 else 900 break; 901 } 902 if (c == ' ' || c == '\t') 903 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 904 if (!c) { 905 *num = acc; 906 return 1; 907 } else 908 printf("%s is an invalid decimal number. Try again.\n", 909 lbuf); 910 } 911 912} 913 914static const char * 915get_type(int type) 916{ 917 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 918 int counter = 0; 919 struct part_type *ptr = part_types; 920 921 922 while(counter < numentries) { 923 if(ptr->type == type) 924 return(ptr->name); 925 ptr++; 926 counter++; 927 } 928 return("unknown"); 929} 930 931 932static void 933parse_config_line(char *line, CMD *command) 934{ 935 char *cp, *end; 936 937 cp = line; 938 while (1) { 939 memset(command, 0, sizeof(*command)); 940 941 while (isspace(*cp)) ++cp; 942 if (*cp == '\0' || *cp == '#') 943 break; 944 command->cmd = *cp++; 945 946 /* 947 * Parse args 948 */ 949 while (1) { 950 while (isspace(*cp)) ++cp; 951 if (*cp == '#') 952 break; /* found comment */ 953 if (isalpha(*cp)) 954 command->args[command->n_args].argtype = *cp++; 955 if (!isdigit(*cp)) 956 break; /* assume end of line */ 957 end = NULL; 958 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 959 if (cp == end) 960 break; /* couldn't parse number */ 961 cp = end; 962 command->n_args++; 963 } 964 break; 965 } 966} 967 968 969static int 970process_geometry(CMD *command) 971{ 972 int status = 1, i; 973 974 while (1) { 975 geom_processed = 1; 976 if (part_processed) { 977 warnx( 978 "ERROR line %d: the geometry specification line must occur before\n\ 979 all partition specifications", 980 current_line_number); 981 status = 0; 982 break; 983 } 984 if (command->n_args != 3) { 985 warnx("ERROR line %d: incorrect number of geometry args", 986 current_line_number); 987 status = 0; 988 break; 989 } 990 dos_cyls = 0; 991 dos_heads = 0; 992 dos_sectors = 0; 993 for (i = 0; i < 3; ++i) { 994 switch (command->args[i].argtype) { 995 case 'c': 996 dos_cyls = command->args[i].arg_val; 997 break; 998 case 'h': 999 dos_heads = command->args[i].arg_val; 1000 break; 1001 case 's': 1002 dos_sectors = command->args[i].arg_val; 1003 break; 1004 default: 1005 warnx( 1006 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1007 current_line_number, command->args[i].argtype, 1008 command->args[i].argtype); 1009 status = 0; 1010 break; 1011 } 1012 } 1013 if (status == 0) 1014 break; 1015 1016 dos_cylsecs = dos_heads * dos_sectors; 1017 1018 /* 1019 * Do sanity checks on parameter values 1020 */ 1021 if (dos_cyls == 0) { 1022 warnx("ERROR line %d: number of cylinders not specified", 1023 current_line_number); 1024 status = 0; 1025 } 1026 if (dos_cyls > 1024) { 1027 warnx( 1028 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1029 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1030 is dedicated to FreeBSD)", 1031 current_line_number, dos_cyls); 1032 } 1033 1034 if (dos_heads == 0) { 1035 warnx("ERROR line %d: number of heads not specified", 1036 current_line_number); 1037 status = 0; 1038 } else if (dos_heads > 256) { 1039 warnx("ERROR line %d: number of heads must be within (1-256)", 1040 current_line_number); 1041 status = 0; 1042 } 1043 1044 if (dos_sectors == 0) { 1045 warnx("ERROR line %d: number of sectors not specified", 1046 current_line_number); 1047 status = 0; 1048 } else if (dos_sectors > 63) { 1049 warnx("ERROR line %d: number of sectors must be within (1-63)", 1050 current_line_number); 1051 status = 0; 1052 } 1053 1054 break; 1055 } 1056 return (status); 1057} 1058 1059 1060static int 1061process_partition(CMD *command) 1062{ 1063 int status = 0, partition; 1064 u_int32_t prev_head_boundary, prev_cyl_boundary; 1065 u_int32_t adj_size, max_end; 1066 struct dos_partition *partp; 1067 1068 while (1) { 1069 part_processed = 1; 1070 if (command->n_args != 4) { 1071 warnx("ERROR line %d: incorrect number of partition args", 1072 current_line_number); 1073 break; 1074 } 1075 partition = command->args[0].arg_val; 1076 if (partition < 1 || partition > 4) { 1077 warnx("ERROR line %d: invalid partition number %d", 1078 current_line_number, partition); 1079 break; 1080 } 1081 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1082 bzero((char *)partp, sizeof (struct dos_partition)); 1083 partp->dp_typ = command->args[1].arg_val; 1084 partp->dp_start = command->args[2].arg_val; 1085 partp->dp_size = command->args[3].arg_val; 1086 max_end = partp->dp_start + partp->dp_size; 1087 1088 if (partp->dp_typ == 0) { 1089 /* 1090 * Get out, the partition is marked as unused. 1091 */ 1092 /* 1093 * Insure that it's unused. 1094 */ 1095 bzero((char *)partp, sizeof (struct dos_partition)); 1096 status = 1; 1097 break; 1098 } 1099 1100 /* 1101 * Adjust start upwards, if necessary, to fall on a head boundary. 1102 */ 1103 if (partp->dp_start % dos_sectors != 0) { 1104 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1105 if (max_end < dos_sectors || 1106 prev_head_boundary > max_end - dos_sectors) { 1107 /* 1108 * Can't go past end of partition 1109 */ 1110 warnx( 1111 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1112 a head boundary", 1113 current_line_number, partition); 1114 break; 1115 } 1116 warnx( 1117 "WARNING: adjusting start offset of partition %d\n\ 1118 from %u to %u, to fall on a head boundary", 1119 partition, (u_int)partp->dp_start, 1120 (u_int)(prev_head_boundary + dos_sectors)); 1121 partp->dp_start = prev_head_boundary + dos_sectors; 1122 } 1123 1124 /* 1125 * Adjust size downwards, if necessary, to fall on a cylinder 1126 * boundary. 1127 */ 1128 prev_cyl_boundary = 1129 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1130 if (prev_cyl_boundary > partp->dp_start) 1131 adj_size = prev_cyl_boundary - partp->dp_start; 1132 else { 1133 warnx( 1134 "ERROR: could not adjust partition to start on a head boundary\n\ 1135 and end on a cylinder boundary."); 1136 return (0); 1137 } 1138 if (adj_size != partp->dp_size) { 1139 warnx( 1140 "WARNING: adjusting size of partition %d from %u to %u\n\ 1141 to end on a cylinder boundary", 1142 partition, (u_int)partp->dp_size, (u_int)adj_size); 1143 partp->dp_size = adj_size; 1144 } 1145 if (partp->dp_size == 0) { 1146 warnx("ERROR line %d: size of partition %d is zero", 1147 current_line_number, partition); 1148 break; 1149 } 1150 1151 dos(partp); 1152 status = 1; 1153 break; 1154 } 1155 return (status); 1156} 1157 1158 1159static int 1160process_active(CMD *command) 1161{ 1162 int status = 0, partition, i; 1163 struct dos_partition *partp; 1164 1165 while (1) { 1166 active_processed = 1; 1167 if (command->n_args != 1) { 1168 warnx("ERROR line %d: incorrect number of active args", 1169 current_line_number); 1170 status = 0; 1171 break; 1172 } 1173 partition = command->args[0].arg_val; 1174 if (partition < 1 || partition > 4) { 1175 warnx("ERROR line %d: invalid partition number %d", 1176 current_line_number, partition); 1177 break; 1178 } 1179 /* 1180 * Reset active partition 1181 */ 1182 partp = ((struct dos_partition *) &mboot.parts); 1183 for (i = 0; i < NDOSPART; i++) 1184 partp[i].dp_flag = 0; 1185 partp[partition-1].dp_flag = ACTIVE; 1186 1187 status = 1; 1188 break; 1189 } 1190 return (status); 1191} 1192 1193 1194static int 1195process_line(char *line) 1196{ 1197 CMD command; 1198 int status = 1; 1199 1200 while (1) { 1201 parse_config_line(line, &command); 1202 switch (command.cmd) { 1203 case 0: 1204 /* 1205 * Comment or blank line 1206 */ 1207 break; 1208 case 'g': 1209 /* 1210 * Set geometry 1211 */ 1212 status = process_geometry(&command); 1213 break; 1214 case 'p': 1215 status = process_partition(&command); 1216 break; 1217 case 'a': 1218 status = process_active(&command); 1219 break; 1220 default: 1221 status = 0; 1222 break; 1223 } 1224 break; 1225 } 1226 return (status); 1227} 1228 1229 1230static int 1231read_config(char *config_file) 1232{ 1233 FILE *fp = NULL; 1234 int status = 1; 1235 char buf[1010]; 1236 1237 while (1) { 1238 if (strcmp(config_file, "-") != 0) { 1239 /* 1240 * We're not reading from stdin 1241 */ 1242 if ((fp = fopen(config_file, "r")) == NULL) { 1243 status = 0; 1244 break; 1245 } 1246 } else { 1247 fp = stdin; 1248 } 1249 current_line_number = 0; 1250 while (!feof(fp)) { 1251 if (fgets(buf, sizeof(buf), fp) == NULL) 1252 break; 1253 ++current_line_number; 1254 status = process_line(buf); 1255 if (status == 0) 1256 break; 1257 } 1258 break; 1259 } 1260 if (fp) { 1261 /* 1262 * It doesn't matter if we're reading from stdin, as we've reached EOF 1263 */ 1264 fclose(fp); 1265 } 1266 return (status); 1267} 1268 1269 1270static void 1271reset_boot(void) 1272{ 1273 int i; 1274 struct dos_partition *partp; 1275 1276 init_boot(); 1277 for (i = 0; i < 4; ++i) { 1278 partp = ((struct dos_partition *) &mboot.parts) + i; 1279 bzero((char *)partp, sizeof (struct dos_partition)); 1280 } 1281} 1282 1283static int 1284sanitize_partition(struct dos_partition *partp) 1285{ 1286 u_int32_t prev_head_boundary, prev_cyl_boundary; 1287 u_int32_t max_end, size, start; 1288 1289 start = partp->dp_start; 1290 size = partp->dp_size; 1291 max_end = start + size; 1292 /* Only allow a zero size if the partition is being marked unused. */ 1293 if (size == 0) { 1294 if (start == 0 && partp->dp_typ == 0) 1295 return (1); 1296 warnx("ERROR: size of partition is zero"); 1297 return (0); 1298 } 1299 /* Return if no adjustment is necessary. */ 1300 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1301 return (1); 1302 1303 if (start % dos_sectors != 0) 1304 warnx("WARNING: partition does not start on a head boundary"); 1305 if ((start +size) % dos_sectors != 0) 1306 warnx("WARNING: partition does not end on a cylinder boundary"); 1307 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1308 if (!ok("Correct this automatically?")) 1309 return (1); 1310 1311 /* 1312 * Adjust start upwards, if necessary, to fall on a head boundary. 1313 */ 1314 if (start % dos_sectors != 0) { 1315 prev_head_boundary = start / dos_sectors * dos_sectors; 1316 if (max_end < dos_sectors || 1317 prev_head_boundary >= max_end - dos_sectors) { 1318 /* 1319 * Can't go past end of partition 1320 */ 1321 warnx( 1322 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1323 return (0); 1324 } 1325 start = prev_head_boundary + dos_sectors; 1326 } 1327 1328 /* 1329 * Adjust size downwards, if necessary, to fall on a cylinder 1330 * boundary. 1331 */ 1332 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1333 if (prev_cyl_boundary > start) 1334 size = prev_cyl_boundary - start; 1335 else { 1336 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1337 and end on a cylinder boundary."); 1338 return (0); 1339 } 1340 1341 /* Finally, commit any changes to partp and return. */ 1342 if (start != partp->dp_start) { 1343 warnx("WARNING: adjusting start offset of partition to %u", 1344 (u_int)start); 1345 partp->dp_start = start; 1346 } 1347 if (size != partp->dp_size) { 1348 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1349 partp->dp_size = size; 1350 } 1351 1352 return (1); 1353} 1354 1355/* 1356 * Try figuring out the root device's canonical disk name. 1357 * The following choices are considered: 1358 * /dev/ad0s1a => /dev/ad0 1359 * /dev/da0a => /dev/da0 1360 * /dev/vinum/root => /dev/vinum/root 1361 */ 1362static char * 1363get_rootdisk(void) 1364{ 1365 struct statfs rootfs; 1366 regex_t re; 1367#define NMATCHES 2 1368 regmatch_t rm[NMATCHES]; 1369 char *s; 1370 int rv; 1371 1372 if (statfs("/", &rootfs) == -1) 1373 err(1, "statfs(\"/\")"); 1374 1375 if ((rv = regcomp(&re, "^(/dev/[a-z]+[0-9]+)([sp][0-9]+)?[a-h]?$", 1376 REG_EXTENDED)) != 0) 1377 errx(1, "regcomp() failed (%d)", rv); 1378 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1379 errx(1, 1380"mounted root fs resource doesn't match expectations (regexec returned %d)", 1381 rv); 1382 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1383 errx(1, "out of memory"); 1384 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1385 rm[1].rm_eo - rm[1].rm_so); 1386 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1387 1388 return s; 1389} 1390