fdisk.c revision 169143
1/* 2 * Mach Operating System 3 * Copyright (c) 1992 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sbin/fdisk/fdisk.c 169143 2007-04-30 18:29:36Z maxim $"); 29 30#include <sys/disk.h> 31#include <sys/disklabel.h> 32#include <sys/diskmbr.h> 33#include <sys/endian.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 <libgeom.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/* 56 * 57 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 58 * 59 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 60 * Copyright (c) 1989 Robert. V. Baron 61 * Created. 62 */ 63 64#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 65 66#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 67 68#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 69#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 70static int secsize = 0; /* the sensed sector size */ 71 72static char *disk; 73 74static int cyls, sectors, heads, cylsecs, disksecs; 75 76struct mboot { 77 unsigned char padding[2]; /* force the longs to be long aligned */ 78 unsigned char *bootinst; /* boot code */ 79 off_t bootinst_size; 80 struct dos_partition parts[NDOSPART]; 81}; 82 83static struct mboot mboot; 84static int fd; 85 86#define ACTIVE 0x80 87 88static uint dos_cyls; 89static uint dos_heads; 90static uint dos_sectors; 91static uint dos_cylsecs; 92 93#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 94#define DOSCYL(c) (c & 0xff) 95 96#define MAX_ARGS 10 97 98static int current_line_number; 99 100static int geom_processed = 0; 101static int part_processed = 0; 102static int active_processed = 0; 103 104typedef struct cmd { 105 char cmd; 106 int n_args; 107 struct arg { 108 char argtype; 109 int arg_val; 110 } args[MAX_ARGS]; 111} CMD; 112 113static int B_flag = 0; /* replace boot code */ 114static int I_flag = 0; /* use entire disk for FreeBSD */ 115static int a_flag = 0; /* set active partition */ 116static char *b_flag = NULL; /* path to boot code */ 117static int i_flag = 0; /* replace partition data */ 118static int u_flag = 0; /* update partition data */ 119static int s_flag = 0; /* Print a summary and exit */ 120static int t_flag = 0; /* test only */ 121static char *f_flag = NULL; /* Read config info from file */ 122static int v_flag = 0; /* Be verbose */ 123static int print_config_flag = 0; 124 125static struct part_type 126{ 127 unsigned char type; 128 const char *name; 129} part_types[] = { 130 {0x00, "unused"} 131 ,{0x01, "Primary DOS with 12 bit FAT"} 132 ,{0x02, "XENIX / file system"} 133 ,{0x03, "XENIX /usr file system"} 134 ,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"} 135 ,{0x05, "Extended DOS"} 136 ,{0x06, "Primary 'big' DOS (>= 32MB)"} 137 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 138 ,{0x08, "AIX file system or SplitDrive"} 139 ,{0x09, "AIX boot partition or Coherent"} 140 ,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"} 141 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 142 ,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"} 143 ,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"} 144 ,{0x0F, "Extended DOS (LBA)"} 145 ,{0x10, "OPUS"} 146 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 147 ,{0x12, "Compaq diagnostics"} 148 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 149 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 150 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 151 ,{0x18, "AST Windows swapfile"} 152 ,{0x24, "NEC DOS"} 153 ,{0x3C, "PartitionMagic recovery"} 154 ,{0x39, "plan9"} 155 ,{0x40, "VENIX 286"} 156 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 157 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 158 ,{0x43, "Linux native (sharing disk with DRDOS)"} 159 ,{0x4D, "QNX 4.2 Primary"} 160 ,{0x4E, "QNX 4.2 Secondary"} 161 ,{0x4F, "QNX 4.2 Tertiary"} 162 ,{0x50, "DM (disk manager)"} 163 ,{0x51, "DM6 Aux1 (or Novell)"} 164 ,{0x52, "CP/M or Microport SysV/AT"} 165 ,{0x53, "DM6 Aux3"} 166 ,{0x54, "DM6"} 167 ,{0x55, "EZ-Drive (disk manager)"} 168 ,{0x56, "Golden Bow (disk manager)"} 169 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 170 ,{0x61, "SpeedStor"} 171 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"} 172 ,{0x64, "Novell Netware/286 2.xx"} 173 ,{0x65, "Novell Netware/386 3.xx"} 174 ,{0x70, "DiskSecure Multi-Boot"} 175 ,{0x75, "PCIX"} 176 ,{0x77, "QNX4.x"} 177 ,{0x78, "QNX4.x 2nd part"} 178 ,{0x79, "QNX4.x 3rd part"} 179 ,{0x80, "Minix until 1.4a"} 180 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"} 181 ,{0x82, "Linux swap or Solaris x86"} 182 ,{0x83, "Linux native"} 183 ,{0x84, "OS/2 hidden C: drive"} 184 ,{0x85, "Linux extended"} 185 ,{0x86, "NTFS volume set??"} 186 ,{0x87, "NTFS volume set??"} 187 ,{0x93, "Amoeba file system"} 188 ,{0x94, "Amoeba bad block table"} 189 ,{0x9F, "BSD/OS"} 190 ,{0xA0, "Suspend to Disk"} 191 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 192 ,{0xA6, "OpenBSD"} 193 ,{0xA7, "NeXTSTEP"} 194 ,{0xA9, "NetBSD"} 195 ,{0xAC, "IBM JFS"} 196 ,{0xB7, "BSDI BSD/386 file system"} 197 ,{0xB8, "BSDI BSD/386 swap"} 198 ,{0xBE, "Solaris x86 boot"} 199 ,{0xBF, "Solaris x86 (new)"} 200 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 201 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 202 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 203 ,{0xC7, "Syrinx"} 204 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 205 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 206 ,{0xE3, "DOS R/O or SpeedStor"} 207 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 208 ,{0xEB, "BeOS file system"} 209 ,{0xEE, "EFI GPT"} 210 ,{0xEF, "EFI System Partition"} 211 ,{0xF1, "SpeedStor"} 212 ,{0xF2, "DOS 3.3+ Secondary"} 213 ,{0xF4, "SpeedStor large partition"} 214 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 215 ,{0xFF, "Xenix bad blocks table"} 216}; 217 218static void print_s0(int which); 219static void print_part(int i); 220static void init_sector0(unsigned long start); 221static void init_boot(void); 222static void change_part(int i); 223static void print_params(void); 224static void change_active(int which); 225static void change_code(void); 226static void get_params_to_use(void); 227static char *get_rootdisk(void); 228static void dos(struct dos_partition *partp); 229static int open_disk(int flag); 230static ssize_t read_disk(off_t sector, void *buf); 231static int write_disk(off_t sector, void *buf); 232static int get_params(void); 233static int read_s0(void); 234static int write_s0(void); 235static int ok(const char *str); 236static int decimal(const char *str, int *num, int deflt); 237static const char *get_type(int type); 238static int read_config(char *config_file); 239static void reset_boot(void); 240static int sanitize_partition(struct dos_partition *); 241static void usage(void); 242 243int 244main(int argc, char *argv[]) 245{ 246 struct stat sb; 247 int c, i; 248 int partition = -1; 249 struct dos_partition *partp; 250 251 while ((c = getopt(argc, argv, "BIab:f:ipstuv1234")) != -1) 252 switch (c) { 253 case 'B': 254 B_flag = 1; 255 break; 256 case 'I': 257 I_flag = 1; 258 break; 259 case 'a': 260 a_flag = 1; 261 break; 262 case 'b': 263 b_flag = optarg; 264 break; 265 case 'f': 266 f_flag = optarg; 267 break; 268 case 'i': 269 i_flag = 1; 270 break; 271 case 'p': 272 print_config_flag = 1; 273 break; 274 case 's': 275 s_flag = 1; 276 break; 277 case 't': 278 t_flag = 1; 279 break; 280 case 'u': 281 u_flag = 1; 282 break; 283 case 'v': 284 v_flag = 1; 285 break; 286 case '1': 287 case '2': 288 case '3': 289 case '4': 290 partition = c - '0'; 291 break; 292 default: 293 usage(); 294 } 295 if (f_flag || i_flag) 296 u_flag = 1; 297 if (t_flag) 298 v_flag = 1; 299 argc -= optind; 300 argv += optind; 301 302 if (argc == 0) { 303 disk = get_rootdisk(); 304 } else { 305 if (stat(argv[0], &sb) == 0) { 306 /* OK, full pathname given */ 307 disk = argv[0]; 308 } else if (errno == ENOENT && argv[0][0] != '/') { 309 /* Try prepending "/dev" */ 310 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 311 if (disk == NULL) 312 errx(1, "out of memory"); 313 } else { 314 /* other stat error, let it fail below */ 315 disk = argv[0]; 316 } 317 } 318 if (open_disk(u_flag) < 0) 319 err(1, "cannot open disk %s", disk); 320 321 /* (abu)use mboot.bootinst to probe for the sector size */ 322 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 323 err(1, "cannot allocate buffer to determine disk sector size"); 324 if (read_disk(0, mboot.bootinst) == -1) 325 errx(1, "could not detect sector size"); 326 free(mboot.bootinst); 327 mboot.bootinst = NULL; 328 329 if (print_config_flag) { 330 if (read_s0()) 331 err(1, "read_s0"); 332 333 printf("# %s\n", disk); 334 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 335 336 for (i = 0; i < NDOSPART; i++) { 337 partp = ((struct dos_partition *)&mboot.parts) + i; 338 339 if (partp->dp_start == 0 && partp->dp_size == 0) 340 continue; 341 342 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 343 (u_long)partp->dp_start, (u_long)partp->dp_size); 344 345 /* Fill flags for the partition. */ 346 if (partp->dp_flag & 0x80) 347 printf("a %d\n", i + 1); 348 } 349 exit(0); 350 } 351 if (s_flag) { 352 if (read_s0()) 353 err(1, "read_s0"); 354 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 355 dos_sectors); 356 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 357 for (i = 0; i < NDOSPART; i++) { 358 partp = ((struct dos_partition *) &mboot.parts) + i; 359 if (partp->dp_start == 0 && partp->dp_size == 0) 360 continue; 361 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 362 (u_long) partp->dp_start, 363 (u_long) partp->dp_size, partp->dp_typ, 364 partp->dp_flag); 365 } 366 exit(0); 367 } 368 369 printf("******* Working on device %s *******\n",disk); 370 371 if (I_flag) { 372 read_s0(); 373 reset_boot(); 374 partp = (struct dos_partition *) (&mboot.parts[0]); 375 partp->dp_typ = DOSPTYP_386BSD; 376 partp->dp_flag = ACTIVE; 377 partp->dp_start = dos_sectors; 378 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 379 dos_sectors; 380 dos(partp); 381 if (v_flag) 382 print_s0(-1); 383 if (!t_flag) 384 write_s0(); 385 exit(0); 386 } 387 if (f_flag) { 388 if (read_s0() || i_flag) 389 reset_boot(); 390 if (!read_config(f_flag)) 391 exit(1); 392 if (v_flag) 393 print_s0(-1); 394 if (!t_flag) 395 write_s0(); 396 } else { 397 if(u_flag) 398 get_params_to_use(); 399 else 400 print_params(); 401 402 if (read_s0()) 403 init_sector0(dos_sectors); 404 405 printf("Media sector size is %d\n", secsize); 406 printf("Warning: BIOS sector numbering starts with sector 1\n"); 407 printf("Information from DOS bootblock is:\n"); 408 if (partition == -1) 409 for (i = 1; i <= NDOSPART; i++) 410 change_part(i); 411 else 412 change_part(partition); 413 414 if (u_flag || a_flag) 415 change_active(partition); 416 417 if (B_flag) 418 change_code(); 419 420 if (u_flag || a_flag || B_flag) { 421 if (!t_flag) { 422 printf("\nWe haven't changed the partition table yet. "); 423 printf("This is your last chance.\n"); 424 } 425 print_s0(-1); 426 if (!t_flag) { 427 if (ok("Should we write new partition table?")) 428 write_s0(); 429 } else { 430 printf("\n-t flag specified -- partition table not written.\n"); 431 } 432 } 433 } 434 435 exit(0); 436} 437 438static void 439usage() 440{ 441 fprintf(stderr, "%s%s", 442 "usage: fdisk [-BIaipstu] [-b bootcode] [-1234] [disk]\n", 443 " fdisk -f configfile [-itv] [disk]\n"); 444 exit(1); 445} 446 447static void 448print_s0(int which) 449{ 450 int i; 451 452 print_params(); 453 printf("Information from DOS bootblock is:\n"); 454 if (which == -1) 455 for (i = 1; i <= NDOSPART; i++) 456 printf("%d: ", i), print_part(i); 457 else 458 print_part(which); 459} 460 461static struct dos_partition mtpart; 462 463static void 464print_part(int i) 465{ 466 struct dos_partition *partp; 467 u_int64_t part_mb; 468 469 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 470 471 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 472 printf("<UNUSED>\n"); 473 return; 474 } 475 /* 476 * Be careful not to overflow. 477 */ 478 part_mb = partp->dp_size; 479 part_mb *= secsize; 480 part_mb /= (1024 * 1024); 481 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 482 get_type(partp->dp_typ)); 483 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 484 (u_long)partp->dp_start, 485 (u_long)partp->dp_size, 486 (uintmax_t)part_mb, 487 partp->dp_flag, 488 partp->dp_flag == ACTIVE ? " (active)" : ""); 489 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 490 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 491 ,partp->dp_shd 492 ,DPSECT(partp->dp_ssect) 493 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 494 ,partp->dp_ehd 495 ,DPSECT(partp->dp_esect)); 496} 497 498 499static void 500init_boot(void) 501{ 502#ifndef __ia64__ 503 const char *fname; 504 int fdesc, n; 505 struct stat sb; 506 507 fname = b_flag ? b_flag : "/boot/mbr"; 508 if ((fdesc = open(fname, O_RDONLY)) == -1 || 509 fstat(fdesc, &sb) == -1) 510 err(1, "%s", fname); 511 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 512 errx(1, "%s: length must be a multiple of sector size", fname); 513 if (mboot.bootinst != NULL) 514 free(mboot.bootinst); 515 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 516 errx(1, "%s: unable to allocate read buffer", fname); 517 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 518 close(fdesc)) 519 err(1, "%s", fname); 520 if (n != mboot.bootinst_size) 521 errx(1, "%s: short read", fname); 522#else 523 if (mboot.bootinst != NULL) 524 free(mboot.bootinst); 525 mboot.bootinst_size = secsize; 526 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 527 errx(1, "unable to allocate boot block buffer"); 528 memset(mboot.bootinst, 0, mboot.bootinst_size); 529 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 530#endif 531} 532 533 534static void 535init_sector0(unsigned long start) 536{ 537 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]); 538 539 init_boot(); 540 541 partp->dp_typ = DOSPTYP_386BSD; 542 partp->dp_flag = ACTIVE; 543 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 544 if(start == 0) 545 start = dos_sectors; 546 partp->dp_start = start; 547 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 548 549 dos(partp); 550} 551 552static void 553change_part(int i) 554{ 555 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 556 557 printf("The data for partition %d is:\n", i); 558 print_part(i); 559 560 if (u_flag && ok("Do you want to change it?")) { 561 int tmp; 562 563 if (i_flag) { 564 bzero((char *)partp, sizeof (struct dos_partition)); 565 if (i == 1) { 566 init_sector0(1); 567 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 568 print_part(i); 569 } 570 } 571 572 do { 573 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 574 Decimal("start", partp->dp_start, tmp); 575 Decimal("size", partp->dp_size, tmp); 576 if (!sanitize_partition(partp)) { 577 warnx("ERROR: failed to adjust; setting sysid to 0"); 578 partp->dp_typ = 0; 579 } 580 581 if (ok("Explicitly specify beg/end address ?")) 582 { 583 int tsec,tcyl,thd; 584 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 585 thd = partp->dp_shd; 586 tsec = DPSECT(partp->dp_ssect); 587 Decimal("beginning cylinder", tcyl, tmp); 588 Decimal("beginning head", thd, tmp); 589 Decimal("beginning sector", tsec, tmp); 590 partp->dp_scyl = DOSCYL(tcyl); 591 partp->dp_ssect = DOSSECT(tsec,tcyl); 592 partp->dp_shd = thd; 593 594 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 595 thd = partp->dp_ehd; 596 tsec = DPSECT(partp->dp_esect); 597 Decimal("ending cylinder", tcyl, tmp); 598 Decimal("ending head", thd, tmp); 599 Decimal("ending sector", tsec, tmp); 600 partp->dp_ecyl = DOSCYL(tcyl); 601 partp->dp_esect = DOSSECT(tsec,tcyl); 602 partp->dp_ehd = thd; 603 } else 604 dos(partp); 605 606 print_part(i); 607 } while (!ok("Are we happy with this entry?")); 608 } 609} 610 611static void 612print_params() 613{ 614 printf("parameters extracted from in-core disklabel are:\n"); 615 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 616 ,cyls,heads,sectors,cylsecs); 617 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 618 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 619 printf("parameters to be used for BIOS calculations are:\n"); 620 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 621 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 622} 623 624static void 625change_active(int which) 626{ 627 struct dos_partition *partp = &mboot.parts[0]; 628 int active, i, new, tmp; 629 630 active = -1; 631 for (i = 0; i < NDOSPART; i++) { 632 if ((partp[i].dp_flag & ACTIVE) == 0) 633 continue; 634 printf("Partition %d is marked active\n", i + 1); 635 if (active == -1) 636 active = i + 1; 637 } 638 if (a_flag && which != -1) 639 active = which; 640 else if (active == -1) 641 active = 1; 642 643 if (!ok("Do you want to change the active partition?")) 644 return; 645setactive: 646 do { 647 new = active; 648 Decimal("active partition", new, tmp); 649 if (new < 1 || new > 4) { 650 printf("Active partition number must be in range 1-4." 651 " Try again.\n"); 652 goto setactive; 653 } 654 active = new; 655 } while (!ok("Are you happy with this choice")); 656 for (i = 0; i < NDOSPART; i++) 657 partp[i].dp_flag = 0; 658 if (active > 0 && active <= NDOSPART) 659 partp[active-1].dp_flag = ACTIVE; 660} 661 662static void 663change_code() 664{ 665 if (ok("Do you want to change the boot code?")) 666 init_boot(); 667} 668 669void 670get_params_to_use() 671{ 672 int tmp; 673 print_params(); 674 if (ok("Do you want to change our idea of what BIOS thinks ?")) 675 { 676 do 677 { 678 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 679 Decimal("BIOS's idea of #heads", dos_heads, tmp); 680 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 681 dos_cylsecs = dos_heads * dos_sectors; 682 print_params(); 683 } 684 while(!ok("Are you happy with this choice")); 685 } 686} 687 688 689/***********************************************\ 690* Change real numbers into strange dos numbers * 691\***********************************************/ 692static void 693dos(struct dos_partition *partp) 694{ 695 int cy, sec; 696 u_int32_t end; 697 698 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 699 memcpy(partp, &mtpart, sizeof(*partp)); 700 return; 701 } 702 703 /* Start c/h/s. */ 704 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 705 cy = partp->dp_start / dos_cylsecs; 706 sec = partp->dp_start % dos_sectors + 1; 707 partp->dp_scyl = DOSCYL(cy); 708 partp->dp_ssect = DOSSECT(sec, cy); 709 710 /* End c/h/s. */ 711 end = partp->dp_start + partp->dp_size - 1; 712 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 713 cy = end / dos_cylsecs; 714 sec = end % dos_sectors + 1; 715 partp->dp_ecyl = DOSCYL(cy); 716 partp->dp_esect = DOSSECT(sec, cy); 717} 718 719static int 720open_disk(int flag) 721{ 722 struct stat st; 723 int rwmode; 724 725 if (stat(disk, &st) == -1) { 726 if (errno == ENOENT) 727 return -2; 728 warnx("can't get file status of %s", disk); 729 return -1; 730 } 731 if ( !(st.st_mode & S_IFCHR) ) 732 warnx("device %s is not character special", disk); 733 rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY; 734 fd = open(disk, rwmode); 735 if (fd == -1 && errno == EPERM && rwmode == O_RDWR) 736 fd = open(disk, O_RDONLY); 737 if (fd == -1 && errno == ENXIO) 738 return -2; 739 if (fd == -1) { 740 warnx("can't open device %s", disk); 741 return -1; 742 } 743 if (get_params() == -1) { 744 warnx("can't get disk parameters on %s", disk); 745 return -1; 746 } 747 return fd; 748} 749 750static ssize_t 751read_disk(off_t sector, void *buf) 752{ 753 754 lseek(fd, (sector * 512), 0); 755 if (secsize == 0) 756 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 757 secsize *= 2) { 758 /* try the read */ 759 int size = read(fd, buf, secsize); 760 if (size == secsize) 761 /* it worked so return */ 762 return secsize; 763 } 764 else 765 return read(fd, buf, secsize); 766 767 /* we failed to read at any of the sizes */ 768 return -1; 769} 770 771static int 772write_disk(off_t sector, void *buf) 773{ 774 int error; 775 struct gctl_req *grq; 776 const char *q; 777 char fbuf[BUFSIZ]; 778 int i, fdw; 779 780 grq = gctl_get_handle(); 781 gctl_ro_param(grq, "verb", -1, "write MBR"); 782 gctl_ro_param(grq, "class", -1, "MBR"); 783 q = strrchr(disk, '/'); 784 if (q == NULL) 785 q = disk; 786 else 787 q++; 788 gctl_ro_param(grq, "geom", -1, q); 789 gctl_ro_param(grq, "data", secsize, buf); 790 q = gctl_issue(grq); 791 if (q == NULL) { 792 gctl_free(grq); 793 return(0); 794 } 795 warnx("%s", q); 796 gctl_free(grq); 797 798 error = pwrite(fd, buf, secsize, (sector * 512)); 799 if (error == secsize) 800 return (0); 801 802 for (i = 1; i < 5; i++) { 803 sprintf(fbuf, "%ss%d", disk, i); 804 fdw = open(fbuf, O_RDWR, 0); 805 if (fdw < 0) 806 continue; 807 error = ioctl(fdw, DIOCSMBR, buf); 808 close(fdw); 809 if (error == 0) 810 return (0); 811 } 812 warnx("Failed to write sector zero"); 813 return(EINVAL); 814} 815 816static int 817get_params() 818{ 819 int error; 820 u_int u; 821 off_t o; 822 823 error = ioctl(fd, DIOCGFWSECTORS, &u); 824 if (error == 0) 825 sectors = dos_sectors = u; 826 else 827 sectors = dos_sectors = 63; 828 829 error = ioctl(fd, DIOCGFWHEADS, &u); 830 if (error == 0) 831 heads = dos_heads = u; 832 else 833 heads = dos_heads = 255; 834 835 dos_cylsecs = cylsecs = heads * sectors; 836 disksecs = cyls * heads * sectors; 837 838 error = ioctl(fd, DIOCGSECTORSIZE, &u); 839 if (error != 0 || u == 0) 840 u = 512; 841 else 842 secsize = u; 843 844 error = ioctl(fd, DIOCGMEDIASIZE, &o); 845 if (error == 0) { 846 disksecs = o / u; 847 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 848 } 849 850 return (disksecs); 851} 852 853 854static int 855read_s0() 856{ 857 int i; 858 859 mboot.bootinst_size = secsize; 860 if (mboot.bootinst != NULL) 861 free(mboot.bootinst); 862 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 863 warnx("unable to allocate buffer to read fdisk " 864 "partition table"); 865 return -1; 866 } 867 if (read_disk(0, mboot.bootinst) == -1) { 868 warnx("can't read fdisk partition table"); 869 return -1; 870 } 871 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 872 warnx("invalid fdisk partition table found"); 873 /* So should we initialize things */ 874 return -1; 875 } 876 for (i = 0; i < NDOSPART; i++) 877 dos_partition_dec( 878 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 879 &mboot.parts[i]); 880 return 0; 881} 882 883static int 884write_s0() 885{ 886 int sector, i; 887 888 if (iotest) { 889 print_s0(-1); 890 return 0; 891 } 892 for(i = 0; i < NDOSPART; i++) 893 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 894 &mboot.parts[i]); 895 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 896 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 897 if (write_disk(sector, 898 &mboot.bootinst[sector * secsize]) == -1) { 899 warn("can't write fdisk partition table"); 900 return -1; 901 } 902 return(0); 903} 904 905 906static int 907ok(const char *str) 908{ 909 printf("%s [n] ", str); 910 fflush(stdout); 911 if (fgets(lbuf, LBUF, stdin) == NULL) 912 exit(1); 913 lbuf[strlen(lbuf)-1] = 0; 914 915 if (*lbuf && 916 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 917 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 918 return 1; 919 else 920 return 0; 921} 922 923static int 924decimal(const char *str, int *num, int deflt) 925{ 926 int acc = 0, c; 927 char *cp; 928 929 while (1) { 930 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 931 fflush(stdout); 932 if (fgets(lbuf, LBUF, stdin) == NULL) 933 exit(1); 934 lbuf[strlen(lbuf)-1] = 0; 935 936 if (!*lbuf) 937 return 0; 938 939 cp = lbuf; 940 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 941 if (!c) 942 return 0; 943 while ((c = *cp++)) { 944 if (c <= '9' && c >= '0') 945 acc = acc * 10 + c - '0'; 946 else 947 break; 948 } 949 if (c == ' ' || c == '\t') 950 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 951 if (!c) { 952 *num = acc; 953 return 1; 954 } else 955 printf("%s is an invalid decimal number. Try again.\n", 956 lbuf); 957 } 958 959} 960 961static const char * 962get_type(int type) 963{ 964 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 965 int counter = 0; 966 struct part_type *ptr = part_types; 967 968 969 while(counter < numentries) { 970 if(ptr->type == type) 971 return(ptr->name); 972 ptr++; 973 counter++; 974 } 975 return("unknown"); 976} 977 978 979static void 980parse_config_line(char *line, CMD *command) 981{ 982 char *cp, *end; 983 984 cp = line; 985 while (1) { 986 memset(command, 0, sizeof(*command)); 987 988 while (isspace(*cp)) ++cp; 989 if (*cp == '\0' || *cp == '#') 990 break; 991 command->cmd = *cp++; 992 993 /* 994 * Parse args 995 */ 996 while (1) { 997 while (isspace(*cp)) ++cp; 998 if (*cp == '#') 999 break; /* found comment */ 1000 if (isalpha(*cp)) 1001 command->args[command->n_args].argtype = *cp++; 1002 if (!isdigit(*cp)) 1003 break; /* assume end of line */ 1004 end = NULL; 1005 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 1006 if (cp == end) 1007 break; /* couldn't parse number */ 1008 cp = end; 1009 command->n_args++; 1010 } 1011 break; 1012 } 1013} 1014 1015 1016static int 1017process_geometry(CMD *command) 1018{ 1019 int status = 1, i; 1020 1021 while (1) { 1022 geom_processed = 1; 1023 if (part_processed) { 1024 warnx( 1025 "ERROR line %d: the geometry specification line must occur before\n\ 1026 all partition specifications", 1027 current_line_number); 1028 status = 0; 1029 break; 1030 } 1031 if (command->n_args != 3) { 1032 warnx("ERROR line %d: incorrect number of geometry args", 1033 current_line_number); 1034 status = 0; 1035 break; 1036 } 1037 dos_cyls = 0; 1038 dos_heads = 0; 1039 dos_sectors = 0; 1040 for (i = 0; i < 3; ++i) { 1041 switch (command->args[i].argtype) { 1042 case 'c': 1043 dos_cyls = command->args[i].arg_val; 1044 break; 1045 case 'h': 1046 dos_heads = command->args[i].arg_val; 1047 break; 1048 case 's': 1049 dos_sectors = command->args[i].arg_val; 1050 break; 1051 default: 1052 warnx( 1053 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1054 current_line_number, command->args[i].argtype, 1055 command->args[i].argtype); 1056 status = 0; 1057 break; 1058 } 1059 } 1060 if (status == 0) 1061 break; 1062 1063 dos_cylsecs = dos_heads * dos_sectors; 1064 1065 /* 1066 * Do sanity checks on parameter values 1067 */ 1068 if (dos_cyls == 0) { 1069 warnx("ERROR line %d: number of cylinders not specified", 1070 current_line_number); 1071 status = 0; 1072 } 1073 if (dos_cyls > 1024) { 1074 warnx( 1075 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1076 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1077 is dedicated to FreeBSD)", 1078 current_line_number, dos_cyls); 1079 } 1080 1081 if (dos_heads == 0) { 1082 warnx("ERROR line %d: number of heads not specified", 1083 current_line_number); 1084 status = 0; 1085 } else if (dos_heads > 256) { 1086 warnx("ERROR line %d: number of heads must be within (1-256)", 1087 current_line_number); 1088 status = 0; 1089 } 1090 1091 if (dos_sectors == 0) { 1092 warnx("ERROR line %d: number of sectors not specified", 1093 current_line_number); 1094 status = 0; 1095 } else if (dos_sectors > 63) { 1096 warnx("ERROR line %d: number of sectors must be within (1-63)", 1097 current_line_number); 1098 status = 0; 1099 } 1100 1101 break; 1102 } 1103 return (status); 1104} 1105 1106 1107static int 1108process_partition(CMD *command) 1109{ 1110 int status = 0, partition; 1111 u_int32_t prev_head_boundary, prev_cyl_boundary; 1112 u_int32_t adj_size, max_end; 1113 struct dos_partition *partp; 1114 1115 while (1) { 1116 part_processed = 1; 1117 if (command->n_args != 4) { 1118 warnx("ERROR line %d: incorrect number of partition args", 1119 current_line_number); 1120 break; 1121 } 1122 partition = command->args[0].arg_val; 1123 if (partition < 1 || partition > 4) { 1124 warnx("ERROR line %d: invalid partition number %d", 1125 current_line_number, partition); 1126 break; 1127 } 1128 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1129 bzero((char *)partp, sizeof (struct dos_partition)); 1130 partp->dp_typ = command->args[1].arg_val; 1131 partp->dp_start = command->args[2].arg_val; 1132 partp->dp_size = command->args[3].arg_val; 1133 max_end = partp->dp_start + partp->dp_size; 1134 1135 if (partp->dp_typ == 0) { 1136 /* 1137 * Get out, the partition is marked as unused. 1138 */ 1139 /* 1140 * Insure that it's unused. 1141 */ 1142 bzero((char *)partp, sizeof (struct dos_partition)); 1143 status = 1; 1144 break; 1145 } 1146 1147 /* 1148 * Adjust start upwards, if necessary, to fall on a head boundary. 1149 */ 1150 if (partp->dp_start % dos_sectors != 0) { 1151 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1152 if (max_end < dos_sectors || 1153 prev_head_boundary > max_end - dos_sectors) { 1154 /* 1155 * Can't go past end of partition 1156 */ 1157 warnx( 1158 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1159 a head boundary", 1160 current_line_number, partition); 1161 break; 1162 } 1163 warnx( 1164 "WARNING: adjusting start offset of partition %d\n\ 1165 from %u to %u, to fall on a head boundary", 1166 partition, (u_int)partp->dp_start, 1167 (u_int)(prev_head_boundary + dos_sectors)); 1168 partp->dp_start = prev_head_boundary + dos_sectors; 1169 } 1170 1171 /* 1172 * Adjust size downwards, if necessary, to fall on a cylinder 1173 * boundary. 1174 */ 1175 prev_cyl_boundary = 1176 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1177 if (prev_cyl_boundary > partp->dp_start) 1178 adj_size = prev_cyl_boundary - partp->dp_start; 1179 else { 1180 warnx( 1181 "ERROR: could not adjust partition to start on a head boundary\n\ 1182 and end on a cylinder boundary."); 1183 return (0); 1184 } 1185 if (adj_size != partp->dp_size) { 1186 warnx( 1187 "WARNING: adjusting size of partition %d from %u to %u\n\ 1188 to end on a cylinder boundary", 1189 partition, (u_int)partp->dp_size, (u_int)adj_size); 1190 partp->dp_size = adj_size; 1191 } 1192 if (partp->dp_size == 0) { 1193 warnx("ERROR line %d: size of partition %d is zero", 1194 current_line_number, partition); 1195 break; 1196 } 1197 1198 dos(partp); 1199 status = 1; 1200 break; 1201 } 1202 return (status); 1203} 1204 1205 1206static int 1207process_active(CMD *command) 1208{ 1209 int status = 0, partition, i; 1210 struct dos_partition *partp; 1211 1212 while (1) { 1213 active_processed = 1; 1214 if (command->n_args != 1) { 1215 warnx("ERROR line %d: incorrect number of active args", 1216 current_line_number); 1217 status = 0; 1218 break; 1219 } 1220 partition = command->args[0].arg_val; 1221 if (partition < 1 || partition > 4) { 1222 warnx("ERROR line %d: invalid partition number %d", 1223 current_line_number, partition); 1224 break; 1225 } 1226 /* 1227 * Reset active partition 1228 */ 1229 partp = ((struct dos_partition *) &mboot.parts); 1230 for (i = 0; i < NDOSPART; i++) 1231 partp[i].dp_flag = 0; 1232 partp[partition-1].dp_flag = ACTIVE; 1233 1234 status = 1; 1235 break; 1236 } 1237 return (status); 1238} 1239 1240 1241static int 1242process_line(char *line) 1243{ 1244 CMD command; 1245 int status = 1; 1246 1247 while (1) { 1248 parse_config_line(line, &command); 1249 switch (command.cmd) { 1250 case 0: 1251 /* 1252 * Comment or blank line 1253 */ 1254 break; 1255 case 'g': 1256 /* 1257 * Set geometry 1258 */ 1259 status = process_geometry(&command); 1260 break; 1261 case 'p': 1262 status = process_partition(&command); 1263 break; 1264 case 'a': 1265 status = process_active(&command); 1266 break; 1267 default: 1268 status = 0; 1269 break; 1270 } 1271 break; 1272 } 1273 return (status); 1274} 1275 1276 1277static int 1278read_config(char *config_file) 1279{ 1280 FILE *fp = NULL; 1281 int status = 1; 1282 char buf[1010]; 1283 1284 while (1) { 1285 if (strcmp(config_file, "-") != 0) { 1286 /* 1287 * We're not reading from stdin 1288 */ 1289 if ((fp = fopen(config_file, "r")) == NULL) { 1290 status = 0; 1291 break; 1292 } 1293 } else { 1294 fp = stdin; 1295 } 1296 current_line_number = 0; 1297 while (!feof(fp)) { 1298 if (fgets(buf, sizeof(buf), fp) == NULL) 1299 break; 1300 ++current_line_number; 1301 status = process_line(buf); 1302 if (status == 0) 1303 break; 1304 } 1305 break; 1306 } 1307 if (fp) { 1308 /* 1309 * It doesn't matter if we're reading from stdin, as we've reached EOF 1310 */ 1311 fclose(fp); 1312 } 1313 return (status); 1314} 1315 1316 1317static void 1318reset_boot(void) 1319{ 1320 int i; 1321 struct dos_partition *partp; 1322 1323 init_boot(); 1324 for (i = 0; i < 4; ++i) { 1325 partp = ((struct dos_partition *) &mboot.parts) + i; 1326 bzero((char *)partp, sizeof (struct dos_partition)); 1327 } 1328} 1329 1330static int 1331sanitize_partition(struct dos_partition *partp) 1332{ 1333 u_int32_t prev_head_boundary, prev_cyl_boundary; 1334 u_int32_t max_end, size, start; 1335 1336 start = partp->dp_start; 1337 size = partp->dp_size; 1338 max_end = start + size; 1339 /* Only allow a zero size if the partition is being marked unused. */ 1340 if (size == 0) { 1341 if (start == 0 && partp->dp_typ == 0) 1342 return (1); 1343 warnx("ERROR: size of partition is zero"); 1344 return (0); 1345 } 1346 /* Return if no adjustment is necessary. */ 1347 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1348 return (1); 1349 1350 if (start == 0) { 1351 warnx("WARNING: partition overlaps with partition table"); 1352 if (ok("Correct this automatically?")) 1353 start = dos_sectors; 1354 } 1355 if (start % dos_sectors != 0) 1356 warnx("WARNING: partition does not start on a head boundary"); 1357 if ((start +size) % dos_sectors != 0) 1358 warnx("WARNING: partition does not end on a cylinder boundary"); 1359 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1360 if (!ok("Correct this automatically?")) 1361 return (1); 1362 1363 /* 1364 * Adjust start upwards, if necessary, to fall on a head boundary. 1365 */ 1366 if (start % dos_sectors != 0) { 1367 prev_head_boundary = start / dos_sectors * dos_sectors; 1368 if (max_end < dos_sectors || 1369 prev_head_boundary >= max_end - dos_sectors) { 1370 /* 1371 * Can't go past end of partition 1372 */ 1373 warnx( 1374 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1375 return (0); 1376 } 1377 start = prev_head_boundary + dos_sectors; 1378 } 1379 1380 /* 1381 * Adjust size downwards, if necessary, to fall on a cylinder 1382 * boundary. 1383 */ 1384 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1385 if (prev_cyl_boundary > start) 1386 size = prev_cyl_boundary - start; 1387 else { 1388 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1389 and end on a cylinder boundary."); 1390 return (0); 1391 } 1392 1393 /* Finally, commit any changes to partp and return. */ 1394 if (start != partp->dp_start) { 1395 warnx("WARNING: adjusting start offset of partition to %u", 1396 (u_int)start); 1397 partp->dp_start = start; 1398 } 1399 if (size != partp->dp_size) { 1400 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1401 partp->dp_size = size; 1402 } 1403 1404 return (1); 1405} 1406 1407/* 1408 * Try figuring out the root device's canonical disk name. 1409 * The following choices are considered: 1410 * /dev/ad0s1a => /dev/ad0 1411 * /dev/da0a => /dev/da0 1412 * /dev/vinum/root => /dev/vinum/root 1413 */ 1414static char * 1415get_rootdisk(void) 1416{ 1417 struct statfs rootfs; 1418 regex_t re; 1419#define NMATCHES 2 1420 regmatch_t rm[NMATCHES]; 1421 char *s; 1422 int rv; 1423 1424 if (statfs("/", &rootfs) == -1) 1425 err(1, "statfs(\"/\")"); 1426 1427 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$", 1428 REG_EXTENDED)) != 0) 1429 errx(1, "regcomp() failed (%d)", rv); 1430 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1431 errx(1, 1432"mounted root fs resource doesn't match expectations (regexec returned %d)", 1433 rv); 1434 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1435 errx(1, "out of memory"); 1436 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1437 rm[1].rm_eo - rm[1].rm_so); 1438 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1439 1440 return s; 1441} 1442