fdisk.c revision 103348
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 103348 2002-09-15 16:08:52Z 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 } 764 error = ioctl(fd, DIOCGFWSECTORS, &u); 765 if (error == 0) 766 dos_sectors = u; 767 error = ioctl(fd, DIOCGFWHEADS, &u); 768 if (error == 0) 769 dos_heads = u; 770 error = ioctl(fd, DIOCGSECTORSIZE, &u); 771 if (error != 0) { 772 u = 512; 773 } 774 error = ioctl(fd, DIOCGMEDIASIZE, &o); 775 if (error == 0) { 776 dos_cylsecs = dos_heads * dos_sectors; 777 disksecs = o / u; 778 dos_cyls = o / (u * dos_heads * dos_sectors); 779 return (o / u); 780 } 781 782 dos_cyls = cyls = disklabel.d_ncylinders; 783 dos_heads = heads = disklabel.d_ntracks; 784 dos_sectors = sectors = disklabel.d_nsectors; 785 dos_cylsecs = cylsecs = heads * sectors; 786 disksecs = cyls * heads * sectors; 787 788 return (disksecs); 789} 790 791 792static int 793read_s0() 794{ 795 mboot.bootinst_size = secsize; 796 if (mboot.bootinst != NULL) 797 free(mboot.bootinst); 798 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 799 warnx("unable to allocate buffer to read fdisk " 800 "partition table"); 801 return -1; 802 } 803 if (read_disk(0, mboot.bootinst) == -1) { 804 warnx("can't read fdisk partition table"); 805 return -1; 806 } 807 if (*(uint16_t *)(void *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 808 warnx("invalid fdisk partition table found"); 809 /* So should we initialize things */ 810 return -1; 811 } 812 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 813 return 0; 814} 815 816static int 817write_s0() 818{ 819 int sector; 820 821 if (iotest) { 822 print_s0(-1); 823 return 0; 824 } 825 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 826 /* 827 * write enable label sector before write (if necessary), 828 * disable after writing. 829 * needed if the disklabel protected area also protects 830 * sector 0. (e.g. empty disk) 831 */ 832 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 833 if (write_disk(sector, 834 &mboot.bootinst[sector * secsize]) == -1) { 835 warn("can't write fdisk partition table"); 836 return -1; 837 } 838 return(0); 839} 840 841 842static int 843ok(const char *str) 844{ 845 printf("%s [n] ", str); 846 fflush(stdout); 847 if (fgets(lbuf, LBUF, stdin) == NULL) 848 exit(1); 849 lbuf[strlen(lbuf)-1] = 0; 850 851 if (*lbuf && 852 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 853 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 854 return 1; 855 else 856 return 0; 857} 858 859static int 860decimal(const char *str, int *num, int deflt) 861{ 862 int acc = 0, c; 863 char *cp; 864 865 while (1) { 866 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 867 fflush(stdout); 868 if (fgets(lbuf, LBUF, stdin) == NULL) 869 exit(1); 870 lbuf[strlen(lbuf)-1] = 0; 871 872 if (!*lbuf) 873 return 0; 874 875 cp = lbuf; 876 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 877 if (!c) 878 return 0; 879 while ((c = *cp++)) { 880 if (c <= '9' && c >= '0') 881 acc = acc * 10 + c - '0'; 882 else 883 break; 884 } 885 if (c == ' ' || c == '\t') 886 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 887 if (!c) { 888 *num = acc; 889 return 1; 890 } else 891 printf("%s is an invalid decimal number. Try again.\n", 892 lbuf); 893 } 894 895} 896 897static const char * 898get_type(int type) 899{ 900 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 901 int counter = 0; 902 struct part_type *ptr = part_types; 903 904 905 while(counter < numentries) { 906 if(ptr->type == type) 907 return(ptr->name); 908 ptr++; 909 counter++; 910 } 911 return("unknown"); 912} 913 914 915static void 916parse_config_line(char *line, CMD *command) 917{ 918 char *cp, *end; 919 920 cp = line; 921 while (1) { 922 memset(command, 0, sizeof(*command)); 923 924 while (isspace(*cp)) ++cp; 925 if (*cp == '\0' || *cp == '#') 926 break; 927 command->cmd = *cp++; 928 929 /* 930 * Parse args 931 */ 932 while (1) { 933 while (isspace(*cp)) ++cp; 934 if (*cp == '#') 935 break; /* found comment */ 936 if (isalpha(*cp)) 937 command->args[command->n_args].argtype = *cp++; 938 if (!isdigit(*cp)) 939 break; /* assume end of line */ 940 end = NULL; 941 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 942 if (cp == end) 943 break; /* couldn't parse number */ 944 cp = end; 945 command->n_args++; 946 } 947 break; 948 } 949} 950 951 952static int 953process_geometry(CMD *command) 954{ 955 int status = 1, i; 956 957 while (1) { 958 geom_processed = 1; 959 if (part_processed) { 960 warnx( 961 "ERROR line %d: the geometry specification line must occur before\n\ 962 all partition specifications", 963 current_line_number); 964 status = 0; 965 break; 966 } 967 if (command->n_args != 3) { 968 warnx("ERROR line %d: incorrect number of geometry args", 969 current_line_number); 970 status = 0; 971 break; 972 } 973 dos_cyls = 0; 974 dos_heads = 0; 975 dos_sectors = 0; 976 for (i = 0; i < 3; ++i) { 977 switch (command->args[i].argtype) { 978 case 'c': 979 dos_cyls = command->args[i].arg_val; 980 break; 981 case 'h': 982 dos_heads = command->args[i].arg_val; 983 break; 984 case 's': 985 dos_sectors = command->args[i].arg_val; 986 break; 987 default: 988 warnx( 989 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 990 current_line_number, command->args[i].argtype, 991 command->args[i].argtype); 992 status = 0; 993 break; 994 } 995 } 996 if (status == 0) 997 break; 998 999 dos_cylsecs = dos_heads * dos_sectors; 1000 1001 /* 1002 * Do sanity checks on parameter values 1003 */ 1004 if (dos_cyls == 0) { 1005 warnx("ERROR line %d: number of cylinders not specified", 1006 current_line_number); 1007 status = 0; 1008 } 1009 if (dos_cyls > 1024) { 1010 warnx( 1011 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1012 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1013 is dedicated to FreeBSD)", 1014 current_line_number, dos_cyls); 1015 } 1016 1017 if (dos_heads == 0) { 1018 warnx("ERROR line %d: number of heads not specified", 1019 current_line_number); 1020 status = 0; 1021 } else if (dos_heads > 256) { 1022 warnx("ERROR line %d: number of heads must be within (1-256)", 1023 current_line_number); 1024 status = 0; 1025 } 1026 1027 if (dos_sectors == 0) { 1028 warnx("ERROR line %d: number of sectors not specified", 1029 current_line_number); 1030 status = 0; 1031 } else if (dos_sectors > 63) { 1032 warnx("ERROR line %d: number of sectors must be within (1-63)", 1033 current_line_number); 1034 status = 0; 1035 } 1036 1037 break; 1038 } 1039 return (status); 1040} 1041 1042 1043static int 1044process_partition(CMD *command) 1045{ 1046 int status = 0, partition; 1047 u_int32_t prev_head_boundary, prev_cyl_boundary; 1048 u_int32_t adj_size, max_end; 1049 struct dos_partition *partp; 1050 1051 while (1) { 1052 part_processed = 1; 1053 if (command->n_args != 4) { 1054 warnx("ERROR line %d: incorrect number of partition args", 1055 current_line_number); 1056 break; 1057 } 1058 partition = command->args[0].arg_val; 1059 if (partition < 1 || partition > 4) { 1060 warnx("ERROR line %d: invalid partition number %d", 1061 current_line_number, partition); 1062 break; 1063 } 1064 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1065 bzero((char *)partp, sizeof (struct dos_partition)); 1066 partp->dp_typ = command->args[1].arg_val; 1067 partp->dp_start = command->args[2].arg_val; 1068 partp->dp_size = command->args[3].arg_val; 1069 max_end = partp->dp_start + partp->dp_size; 1070 1071 if (partp->dp_typ == 0) { 1072 /* 1073 * Get out, the partition is marked as unused. 1074 */ 1075 /* 1076 * Insure that it's unused. 1077 */ 1078 bzero((char *)partp, sizeof (struct dos_partition)); 1079 status = 1; 1080 break; 1081 } 1082 1083 /* 1084 * Adjust start upwards, if necessary, to fall on an head boundary. 1085 */ 1086 if (partp->dp_start % dos_sectors != 0) { 1087 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1088 if (max_end < dos_sectors || 1089 prev_head_boundary > max_end - dos_sectors) { 1090 /* 1091 * Can't go past end of partition 1092 */ 1093 warnx( 1094 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1095 a head boundary", 1096 current_line_number, partition); 1097 break; 1098 } 1099 warnx( 1100 "WARNING: adjusting start offset of partition %d\n\ 1101 from %u to %u, to fall on a head boundary", 1102 partition, (u_int)partp->dp_start, 1103 (u_int)(prev_head_boundary + dos_sectors)); 1104 partp->dp_start = prev_head_boundary + dos_sectors; 1105 } 1106 1107 /* 1108 * Adjust size downwards, if necessary, to fall on a cylinder 1109 * boundary. 1110 */ 1111 prev_cyl_boundary = 1112 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1113 if (prev_cyl_boundary > partp->dp_start) 1114 adj_size = prev_cyl_boundary - partp->dp_start; 1115 else { 1116 warnx( 1117 "ERROR: could not adjust partition to start on a head boundary\n\ 1118 and end on a cylinder boundary."); 1119 return (0); 1120 } 1121 if (adj_size != partp->dp_size) { 1122 warnx( 1123 "WARNING: adjusting size of partition %d from %u to %u\n\ 1124 to end on a cylinder boundary", 1125 partition, (u_int)partp->dp_size, (u_int)adj_size); 1126 partp->dp_size = adj_size; 1127 } 1128 if (partp->dp_size == 0) { 1129 warnx("ERROR line %d: size of partition %d is zero", 1130 current_line_number, partition); 1131 break; 1132 } 1133 1134 dos(partp); 1135 status = 1; 1136 break; 1137 } 1138 return (status); 1139} 1140 1141 1142static int 1143process_active(CMD *command) 1144{ 1145 int status = 0, partition, i; 1146 struct dos_partition *partp; 1147 1148 while (1) { 1149 active_processed = 1; 1150 if (command->n_args != 1) { 1151 warnx("ERROR line %d: incorrect number of active args", 1152 current_line_number); 1153 status = 0; 1154 break; 1155 } 1156 partition = command->args[0].arg_val; 1157 if (partition < 1 || partition > 4) { 1158 warnx("ERROR line %d: invalid partition number %d", 1159 current_line_number, partition); 1160 break; 1161 } 1162 /* 1163 * Reset active partition 1164 */ 1165 partp = ((struct dos_partition *) &mboot.parts); 1166 for (i = 0; i < NDOSPART; i++) 1167 partp[i].dp_flag = 0; 1168 partp[partition-1].dp_flag = ACTIVE; 1169 1170 status = 1; 1171 break; 1172 } 1173 return (status); 1174} 1175 1176 1177static int 1178process_line(char *line) 1179{ 1180 CMD command; 1181 int status = 1; 1182 1183 while (1) { 1184 parse_config_line(line, &command); 1185 switch (command.cmd) { 1186 case 0: 1187 /* 1188 * Comment or blank line 1189 */ 1190 break; 1191 case 'g': 1192 /* 1193 * Set geometry 1194 */ 1195 status = process_geometry(&command); 1196 break; 1197 case 'p': 1198 status = process_partition(&command); 1199 break; 1200 case 'a': 1201 status = process_active(&command); 1202 break; 1203 default: 1204 status = 0; 1205 break; 1206 } 1207 break; 1208 } 1209 return (status); 1210} 1211 1212 1213static int 1214read_config(char *config_file) 1215{ 1216 FILE *fp = NULL; 1217 int status = 1; 1218 char buf[1010]; 1219 1220 while (1) { 1221 if (strcmp(config_file, "-") != 0) { 1222 /* 1223 * We're not reading from stdin 1224 */ 1225 if ((fp = fopen(config_file, "r")) == NULL) { 1226 status = 0; 1227 break; 1228 } 1229 } else { 1230 fp = stdin; 1231 } 1232 current_line_number = 0; 1233 while (!feof(fp)) { 1234 if (fgets(buf, sizeof(buf), fp) == NULL) 1235 break; 1236 ++current_line_number; 1237 status = process_line(buf); 1238 if (status == 0) 1239 break; 1240 } 1241 break; 1242 } 1243 if (fp) { 1244 /* 1245 * It doesn't matter if we're reading from stdin, as we've reached EOF 1246 */ 1247 fclose(fp); 1248 } 1249 return (status); 1250} 1251 1252 1253static void 1254reset_boot(void) 1255{ 1256 int i; 1257 struct dos_partition *partp; 1258 1259 init_boot(); 1260 for (i = 0; i < 4; ++i) { 1261 partp = ((struct dos_partition *) &mboot.parts) + i; 1262 bzero((char *)partp, sizeof (struct dos_partition)); 1263 } 1264} 1265 1266static int 1267sanitize_partition(struct dos_partition *partp) 1268{ 1269 u_int32_t prev_head_boundary, prev_cyl_boundary; 1270 u_int32_t max_end, size, start; 1271 1272 start = partp->dp_start; 1273 size = partp->dp_size; 1274 max_end = start + size; 1275 /* Only allow a zero size if the partition is being marked unused. */ 1276 if (size == 0) { 1277 if (start == 0 && partp->dp_typ == 0) 1278 return (1); 1279 warnx("ERROR: size of partition is zero"); 1280 return (0); 1281 } 1282 /* Return if no adjustment is necessary. */ 1283 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1284 return (1); 1285 1286 if (start % dos_sectors != 0) 1287 warnx("WARNING: partition does not start on a head boundary"); 1288 if ((start +size) % dos_sectors != 0) 1289 warnx("WARNING: partition does not end on a cylinder boundary"); 1290 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1291 if (!ok("Correct this automatically?")) 1292 return (1); 1293 1294 /* 1295 * Adjust start upwards, if necessary, to fall on an head boundary. 1296 */ 1297 if (start % dos_sectors != 0) { 1298 prev_head_boundary = start / dos_sectors * dos_sectors; 1299 if (max_end < dos_sectors || 1300 prev_head_boundary >= max_end - dos_sectors) { 1301 /* 1302 * Can't go past end of partition 1303 */ 1304 warnx( 1305 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1306 return (0); 1307 } 1308 start = prev_head_boundary + dos_sectors; 1309 } 1310 1311 /* 1312 * Adjust size downwards, if necessary, to fall on a cylinder 1313 * boundary. 1314 */ 1315 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1316 if (prev_cyl_boundary > start) 1317 size = prev_cyl_boundary - start; 1318 else { 1319 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1320 and end on a cylinder boundary."); 1321 return (0); 1322 } 1323 1324 /* Finally, commit any changes to partp and return. */ 1325 if (start != partp->dp_start) { 1326 warnx("WARNING: adjusting start offset of partition to %u", 1327 (u_int)start); 1328 partp->dp_start = start; 1329 } 1330 if (size != partp->dp_size) { 1331 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1332 partp->dp_size = size; 1333 } 1334 1335 return (1); 1336} 1337 1338/* 1339 * Try figuring out the root device's canonical disk name. 1340 * The following choices are considered: 1341 * /dev/ad0s1a => /dev/ad0 1342 * /dev/da0a => /dev/da0 1343 * /dev/vinum/root => /dev/vinum/root 1344 */ 1345static char * 1346get_rootdisk(void) 1347{ 1348 struct statfs rootfs; 1349 regex_t re; 1350#define NMATCHES 2 1351 regmatch_t rm[NMATCHES]; 1352 char *s; 1353 int rv; 1354 1355 if (statfs("/", &rootfs) == -1) 1356 err(1, "statfs(\"/\")"); 1357 1358 if ((rv = regcomp(&re, "^(/dev/.*)(\\d+(s\\d+)?[a-h])?$", 1359 REG_EXTENDED)) != 0) 1360 errx(1, "regcomp() failed (%d)", rv); 1361 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1362 errx(1, 1363"mounted root fs resource doesn't match expectations (regexec returned %d)", 1364 rv); 1365 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1366 errx(1, "out of memory"); 1367 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1368 rm[1].rm_eo - rm[1].rm_so); 1369 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1370 1371 return s; 1372} 1373