fdisk.c revision 159757
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 159757 2006-06-18 22:02:22Z simon $"); 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 */ 123 124static struct part_type 125{ 126 unsigned char type; 127 const char *name; 128} part_types[] = { 129 {0x00, "unused"} 130 ,{0x01, "Primary DOS with 12 bit FAT"} 131 ,{0x02, "XENIX / file system"} 132 ,{0x03, "XENIX /usr file system"} 133 ,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"} 134 ,{0x05, "Extended DOS"} 135 ,{0x06, "Primary 'big' DOS (>= 32MB)"} 136 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 137 ,{0x08, "AIX file system or SplitDrive"} 138 ,{0x09, "AIX boot partition or Coherent"} 139 ,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"} 140 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 141 ,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"} 142 ,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"} 143 ,{0x0F, "Extended DOS (LBA)"} 144 ,{0x10, "OPUS"} 145 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 146 ,{0x12, "Compaq diagnostics"} 147 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 148 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 149 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 150 ,{0x18, "AST Windows swapfile"} 151 ,{0x24, "NEC DOS"} 152 ,{0x3C, "PartitionMagic recovery"} 153 ,{0x39, "plan9"} 154 ,{0x40, "VENIX 286"} 155 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 156 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 157 ,{0x43, "Linux native (sharing disk with DRDOS)"} 158 ,{0x4D, "QNX 4.2 Primary"} 159 ,{0x4E, "QNX 4.2 Secondary"} 160 ,{0x4F, "QNX 4.2 Tertiary"} 161 ,{0x50, "DM (disk manager)"} 162 ,{0x51, "DM6 Aux1 (or Novell)"} 163 ,{0x52, "CP/M or Microport SysV/AT"} 164 ,{0x53, "DM6 Aux3"} 165 ,{0x54, "DM6"} 166 ,{0x55, "EZ-Drive (disk manager)"} 167 ,{0x56, "Golden Bow (disk manager)"} 168 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 169 ,{0x61, "SpeedStor"} 170 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"} 171 ,{0x64, "Novell Netware/286 2.xx"} 172 ,{0x65, "Novell Netware/386 3.xx"} 173 ,{0x70, "DiskSecure Multi-Boot"} 174 ,{0x75, "PCIX"} 175 ,{0x77, "QNX4.x"} 176 ,{0x78, "QNX4.x 2nd part"} 177 ,{0x79, "QNX4.x 3rd part"} 178 ,{0x80, "Minix until 1.4a"} 179 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"} 180 ,{0x82, "Linux swap or Solaris x86"} 181 ,{0x83, "Linux native"} 182 ,{0x84, "OS/2 hidden C: drive"} 183 ,{0x85, "Linux extended"} 184 ,{0x86, "NTFS volume set??"} 185 ,{0x87, "NTFS volume set??"} 186 ,{0x93, "Amoeba file system"} 187 ,{0x94, "Amoeba bad block table"} 188 ,{0x9F, "BSD/OS"} 189 ,{0xA0, "Suspend to Disk"} 190 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 191 ,{0xA6, "OpenBSD"} 192 ,{0xA7, "NeXTSTEP"} 193 ,{0xA9, "NetBSD"} 194 ,{0xAC, "IBM JFS"} 195 ,{0xB7, "BSDI BSD/386 file system"} 196 ,{0xB8, "BSDI BSD/386 swap"} 197 ,{0xBE, "Solaris x86 boot"} 198 ,{0xBF, "Solaris x86 (new)"} 199 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 200 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 201 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 202 ,{0xC7, "Syrinx"} 203 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 204 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 205 ,{0xE3, "DOS R/O or SpeedStor"} 206 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 207 ,{0xEB, "BeOS file system"} 208 ,{0xEE, "EFI GPT"} 209 ,{0xEF, "EFI System Partition"} 210 ,{0xF1, "SpeedStor"} 211 ,{0xF2, "DOS 3.3+ Secondary"} 212 ,{0xF4, "SpeedStor large partition"} 213 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 214 ,{0xFF, "Xenix bad blocks table"} 215}; 216 217static void print_s0(int which); 218static void print_part(int i); 219static void init_sector0(unsigned long start); 220static void init_boot(void); 221static void change_part(int i); 222static void print_params(void); 223static void change_active(int which); 224static void change_code(void); 225static void get_params_to_use(void); 226static char *get_rootdisk(void); 227static void dos(struct dos_partition *partp); 228static int open_disk(int flag); 229static ssize_t read_disk(off_t sector, void *buf); 230static int write_disk(off_t sector, void *buf); 231static int get_params(void); 232static int read_s0(void); 233static int write_s0(void); 234static int ok(const char *str); 235static int decimal(const char *str, int *num, int deflt); 236static const char *get_type(int type); 237static int read_config(char *config_file); 238static void reset_boot(void); 239static int sanitize_partition(struct dos_partition *); 240static void usage(void); 241 242int 243main(int argc, char *argv[]) 244{ 245 struct stat sb; 246 int c, i; 247 int partition = -1; 248 struct dos_partition *partp; 249 250 while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1) 251 switch (c) { 252 case 'B': 253 B_flag = 1; 254 break; 255 case 'I': 256 I_flag = 1; 257 break; 258 case 'a': 259 a_flag = 1; 260 break; 261 case 'b': 262 b_flag = optarg; 263 break; 264 case 'f': 265 f_flag = optarg; 266 break; 267 case 'i': 268 i_flag = 1; 269 break; 270 case 's': 271 s_flag = 1; 272 break; 273 case 't': 274 t_flag = 1; 275 break; 276 case 'u': 277 u_flag = 1; 278 break; 279 case 'v': 280 v_flag = 1; 281 break; 282 case '1': 283 case '2': 284 case '3': 285 case '4': 286 partition = c - '0'; 287 break; 288 default: 289 usage(); 290 } 291 if (f_flag || i_flag) 292 u_flag = 1; 293 if (t_flag) 294 v_flag = 1; 295 argc -= optind; 296 argv += optind; 297 298 if (argc == 0) { 299 disk = get_rootdisk(); 300 } else { 301 if (stat(argv[0], &sb) == 0) { 302 /* OK, full pathname given */ 303 disk = argv[0]; 304 } else if (errno == ENOENT && argv[0][0] != '/') { 305 /* Try prepending "/dev" */ 306 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 307 if (disk == NULL) 308 errx(1, "out of memory"); 309 } else { 310 /* other stat error, let it fail below */ 311 disk = argv[0]; 312 } 313 } 314 if (open_disk(u_flag) < 0) 315 err(1, "cannot open disk %s", disk); 316 317 /* (abu)use mboot.bootinst to probe for the sector size */ 318 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 319 err(1, "cannot allocate buffer to determine disk sector size"); 320 if (read_disk(0, mboot.bootinst) == -1) 321 errx(1, "could not detect sector size"); 322 free(mboot.bootinst); 323 mboot.bootinst = NULL; 324 325 if (s_flag) { 326 if (read_s0()) 327 err(1, "read_s0"); 328 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 329 dos_sectors); 330 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 331 for (i = 0; i < NDOSPART; i++) { 332 partp = ((struct dos_partition *) &mboot.parts) + i; 333 if (partp->dp_start == 0 && partp->dp_size == 0) 334 continue; 335 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 336 (u_long) partp->dp_start, 337 (u_long) partp->dp_size, partp->dp_typ, 338 partp->dp_flag); 339 } 340 exit(0); 341 } 342 343 printf("******* Working on device %s *******\n",disk); 344 345 if (I_flag) { 346 read_s0(); 347 reset_boot(); 348 partp = (struct dos_partition *) (&mboot.parts[0]); 349 partp->dp_typ = DOSPTYP_386BSD; 350 partp->dp_flag = ACTIVE; 351 partp->dp_start = dos_sectors; 352 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 353 dos_sectors; 354 dos(partp); 355 if (v_flag) 356 print_s0(-1); 357 if (!t_flag) 358 write_s0(); 359 exit(0); 360 } 361 if (f_flag) { 362 if (read_s0() || i_flag) 363 reset_boot(); 364 if (!read_config(f_flag)) 365 exit(1); 366 if (v_flag) 367 print_s0(-1); 368 if (!t_flag) 369 write_s0(); 370 } else { 371 if(u_flag) 372 get_params_to_use(); 373 else 374 print_params(); 375 376 if (read_s0()) 377 init_sector0(dos_sectors); 378 379 printf("Media sector size is %d\n", secsize); 380 printf("Warning: BIOS sector numbering starts with sector 1\n"); 381 printf("Information from DOS bootblock is:\n"); 382 if (partition == -1) 383 for (i = 1; i <= NDOSPART; i++) 384 change_part(i); 385 else 386 change_part(partition); 387 388 if (u_flag || a_flag) 389 change_active(partition); 390 391 if (B_flag) 392 change_code(); 393 394 if (u_flag || a_flag || B_flag) { 395 if (!t_flag) { 396 printf("\nWe haven't changed the partition table yet. "); 397 printf("This is your last chance.\n"); 398 } 399 print_s0(-1); 400 if (!t_flag) { 401 if (ok("Should we write new partition table?")) 402 write_s0(); 403 } else { 404 printf("\n-t flag specified -- partition table not written.\n"); 405 } 406 } 407 } 408 409 exit(0); 410} 411 412static void 413usage() 414{ 415 fprintf(stderr, "%s%s", 416 "usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n", 417 " fdisk -f configfile [-itv] [disk]\n"); 418 exit(1); 419} 420 421static void 422print_s0(int which) 423{ 424 int i; 425 426 print_params(); 427 printf("Information from DOS bootblock is:\n"); 428 if (which == -1) 429 for (i = 1; i <= NDOSPART; i++) 430 printf("%d: ", i), print_part(i); 431 else 432 print_part(which); 433} 434 435static struct dos_partition mtpart; 436 437static void 438print_part(int i) 439{ 440 struct dos_partition *partp; 441 u_int64_t part_mb; 442 443 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 444 445 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 446 printf("<UNUSED>\n"); 447 return; 448 } 449 /* 450 * Be careful not to overflow. 451 */ 452 part_mb = partp->dp_size; 453 part_mb *= secsize; 454 part_mb /= (1024 * 1024); 455 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 456 get_type(partp->dp_typ)); 457 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 458 (u_long)partp->dp_start, 459 (u_long)partp->dp_size, 460 (uintmax_t)part_mb, 461 partp->dp_flag, 462 partp->dp_flag == ACTIVE ? " (active)" : ""); 463 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 464 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 465 ,partp->dp_shd 466 ,DPSECT(partp->dp_ssect) 467 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 468 ,partp->dp_ehd 469 ,DPSECT(partp->dp_esect)); 470} 471 472 473static void 474init_boot(void) 475{ 476#ifndef __ia64__ 477 const char *fname; 478 int fdesc, n; 479 struct stat sb; 480 481 fname = b_flag ? b_flag : "/boot/mbr"; 482 if ((fdesc = open(fname, O_RDONLY)) == -1 || 483 fstat(fdesc, &sb) == -1) 484 err(1, "%s", fname); 485 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 486 errx(1, "%s: length must be a multiple of sector size", fname); 487 if (mboot.bootinst != NULL) 488 free(mboot.bootinst); 489 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 490 errx(1, "%s: unable to allocate read buffer", fname); 491 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 492 close(fdesc)) 493 err(1, "%s", fname); 494 if (n != mboot.bootinst_size) 495 errx(1, "%s: short read", fname); 496#else 497 if (mboot.bootinst != NULL) 498 free(mboot.bootinst); 499 mboot.bootinst_size = secsize; 500 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 501 errx(1, "unable to allocate boot block buffer"); 502 memset(mboot.bootinst, 0, mboot.bootinst_size); 503 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 504#endif 505} 506 507 508static void 509init_sector0(unsigned long start) 510{ 511 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]); 512 513 init_boot(); 514 515 partp->dp_typ = DOSPTYP_386BSD; 516 partp->dp_flag = ACTIVE; 517 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 518 if(start == 0) 519 start = dos_sectors; 520 partp->dp_start = start; 521 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 522 523 dos(partp); 524} 525 526static void 527change_part(int i) 528{ 529 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 530 531 printf("The data for partition %d is:\n", i); 532 print_part(i); 533 534 if (u_flag && ok("Do you want to change it?")) { 535 int tmp; 536 537 if (i_flag) { 538 bzero((char *)partp, sizeof (struct dos_partition)); 539 if (i == 1) { 540 init_sector0(1); 541 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 542 print_part(i); 543 } 544 } 545 546 do { 547 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 548 Decimal("start", partp->dp_start, tmp); 549 Decimal("size", partp->dp_size, tmp); 550 if (!sanitize_partition(partp)) { 551 warnx("ERROR: failed to adjust; setting sysid to 0"); 552 partp->dp_typ = 0; 553 } 554 555 if (ok("Explicitly specify beg/end address ?")) 556 { 557 int tsec,tcyl,thd; 558 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 559 thd = partp->dp_shd; 560 tsec = DPSECT(partp->dp_ssect); 561 Decimal("beginning cylinder", tcyl, tmp); 562 Decimal("beginning head", thd, tmp); 563 Decimal("beginning sector", tsec, tmp); 564 partp->dp_scyl = DOSCYL(tcyl); 565 partp->dp_ssect = DOSSECT(tsec,tcyl); 566 partp->dp_shd = thd; 567 568 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 569 thd = partp->dp_ehd; 570 tsec = DPSECT(partp->dp_esect); 571 Decimal("ending cylinder", tcyl, tmp); 572 Decimal("ending head", thd, tmp); 573 Decimal("ending sector", tsec, tmp); 574 partp->dp_ecyl = DOSCYL(tcyl); 575 partp->dp_esect = DOSSECT(tsec,tcyl); 576 partp->dp_ehd = thd; 577 } else 578 dos(partp); 579 580 print_part(i); 581 } while (!ok("Are we happy with this entry?")); 582 } 583} 584 585static void 586print_params() 587{ 588 printf("parameters extracted from in-core disklabel are:\n"); 589 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 590 ,cyls,heads,sectors,cylsecs); 591 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 592 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 593 printf("parameters to be used for BIOS calculations are:\n"); 594 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 595 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 596} 597 598static void 599change_active(int which) 600{ 601 struct dos_partition *partp = &mboot.parts[0]; 602 int active, i, new, tmp; 603 604 active = -1; 605 for (i = 0; i < NDOSPART; i++) { 606 if ((partp[i].dp_flag & ACTIVE) == 0) 607 continue; 608 printf("Partition %d is marked active\n", i + 1); 609 if (active == -1) 610 active = i + 1; 611 } 612 if (a_flag && which != -1) 613 active = which; 614 else if (active == -1) 615 active = 1; 616 617 if (!ok("Do you want to change the active partition?")) 618 return; 619setactive: 620 do { 621 new = active; 622 Decimal("active partition", new, tmp); 623 if (new < 1 || new > 4) { 624 printf("Active partition number must be in range 1-4." 625 " Try again.\n"); 626 goto setactive; 627 } 628 active = new; 629 } while (!ok("Are you happy with this choice")); 630 for (i = 0; i < NDOSPART; i++) 631 partp[i].dp_flag = 0; 632 if (active > 0 && active <= NDOSPART) 633 partp[active-1].dp_flag = ACTIVE; 634} 635 636static void 637change_code() 638{ 639 if (ok("Do you want to change the boot code?")) 640 init_boot(); 641} 642 643void 644get_params_to_use() 645{ 646 int tmp; 647 print_params(); 648 if (ok("Do you want to change our idea of what BIOS thinks ?")) 649 { 650 do 651 { 652 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 653 Decimal("BIOS's idea of #heads", dos_heads, tmp); 654 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 655 dos_cylsecs = dos_heads * dos_sectors; 656 print_params(); 657 } 658 while(!ok("Are you happy with this choice")); 659 } 660} 661 662 663/***********************************************\ 664* Change real numbers into strange dos numbers * 665\***********************************************/ 666static void 667dos(struct dos_partition *partp) 668{ 669 int cy, sec; 670 u_int32_t end; 671 672 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 673 memcpy(partp, &mtpart, sizeof(*partp)); 674 return; 675 } 676 677 /* Start c/h/s. */ 678 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 679 cy = partp->dp_start / dos_cylsecs; 680 sec = partp->dp_start % dos_sectors + 1; 681 partp->dp_scyl = DOSCYL(cy); 682 partp->dp_ssect = DOSSECT(sec, cy); 683 684 /* End c/h/s. */ 685 end = partp->dp_start + partp->dp_size - 1; 686 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 687 cy = end / dos_cylsecs; 688 sec = end % dos_sectors + 1; 689 partp->dp_ecyl = DOSCYL(cy); 690 partp->dp_esect = DOSSECT(sec, cy); 691} 692 693static int 694open_disk(int flag) 695{ 696 struct stat st; 697 int rwmode; 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 rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY; 708 fd = open(disk, rwmode); 709 if (fd == -1 && errno == EPERM && rwmode == O_RDWR) 710 fd = open(disk, O_RDONLY); 711 if (fd == -1 && errno == ENXIO) 712 return -2; 713 if (fd == -1) { 714 warnx("can't open device %s", disk); 715 return -1; 716 } 717 if (get_params() == -1) { 718 warnx("can't get disk parameters on %s", disk); 719 return -1; 720 } 721 return fd; 722} 723 724static ssize_t 725read_disk(off_t sector, void *buf) 726{ 727 728 lseek(fd, (sector * 512), 0); 729 if (secsize == 0) 730 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 731 secsize *= 2) { 732 /* try the read */ 733 int size = read(fd, buf, secsize); 734 if (size == secsize) 735 /* it worked so return */ 736 return secsize; 737 } 738 else 739 return read(fd, buf, secsize); 740 741 /* we failed to read at any of the sizes */ 742 return -1; 743} 744 745static int 746write_disk(off_t sector, void *buf) 747{ 748 int error; 749 struct gctl_req *grq; 750 const char *q; 751 char fbuf[BUFSIZ]; 752 int i, fdw; 753 754 grq = gctl_get_handle(); 755 gctl_ro_param(grq, "verb", -1, "write MBR"); 756 gctl_ro_param(grq, "class", -1, "MBR"); 757 q = strrchr(disk, '/'); 758 if (q == NULL) 759 q = disk; 760 else 761 q++; 762 gctl_ro_param(grq, "geom", -1, q); 763 gctl_ro_param(grq, "data", secsize, buf); 764 q = gctl_issue(grq); 765 if (q == NULL) { 766 gctl_free(grq); 767 return(0); 768 } 769 warnx("%s", q); 770 gctl_free(grq); 771 772 error = pwrite(fd, buf, secsize, (sector * 512)); 773 if (error == secsize) 774 return (0); 775 776 for (i = 1; i < 5; i++) { 777 sprintf(fbuf, "%ss%d", disk, i); 778 fdw = open(fbuf, O_RDWR, 0); 779 if (fdw < 0) 780 continue; 781 error = ioctl(fdw, DIOCSMBR, buf); 782 close(fdw); 783 if (error == 0) 784 return (0); 785 } 786 warnx("Failed to write sector zero"); 787 return(EINVAL); 788} 789 790static int 791get_params() 792{ 793 int error; 794 u_int u; 795 off_t o; 796 797 error = ioctl(fd, DIOCGFWSECTORS, &u); 798 if (error == 0) 799 sectors = dos_sectors = u; 800 else 801 sectors = dos_sectors = 63; 802 803 error = ioctl(fd, DIOCGFWHEADS, &u); 804 if (error == 0) 805 heads = dos_heads = u; 806 else 807 heads = dos_heads = 255; 808 809 dos_cylsecs = cylsecs = heads * sectors; 810 disksecs = cyls * heads * sectors; 811 812 error = ioctl(fd, DIOCGSECTORSIZE, &u); 813 if (error != 0 || u == 0) 814 u = 512; 815 else 816 secsize = u; 817 818 error = ioctl(fd, DIOCGMEDIASIZE, &o); 819 if (error == 0) { 820 disksecs = o / u; 821 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 822 } 823 824 return (disksecs); 825} 826 827 828static int 829read_s0() 830{ 831 int i; 832 833 mboot.bootinst_size = secsize; 834 if (mboot.bootinst != NULL) 835 free(mboot.bootinst); 836 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 837 warnx("unable to allocate buffer to read fdisk " 838 "partition table"); 839 return -1; 840 } 841 if (read_disk(0, mboot.bootinst) == -1) { 842 warnx("can't read fdisk partition table"); 843 return -1; 844 } 845 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 846 warnx("invalid fdisk partition table found"); 847 /* So should we initialize things */ 848 return -1; 849 } 850 for (i = 0; i < NDOSPART; i++) 851 dos_partition_dec( 852 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 853 &mboot.parts[i]); 854 return 0; 855} 856 857static int 858write_s0() 859{ 860 int sector, i; 861 862 if (iotest) { 863 print_s0(-1); 864 return 0; 865 } 866 for(i = 0; i < NDOSPART; i++) 867 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 868 &mboot.parts[i]); 869 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 870 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 871 if (write_disk(sector, 872 &mboot.bootinst[sector * secsize]) == -1) { 873 warn("can't write fdisk partition table"); 874 return -1; 875 } 876 return(0); 877} 878 879 880static int 881ok(const char *str) 882{ 883 printf("%s [n] ", str); 884 fflush(stdout); 885 if (fgets(lbuf, LBUF, stdin) == NULL) 886 exit(1); 887 lbuf[strlen(lbuf)-1] = 0; 888 889 if (*lbuf && 890 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 891 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 892 return 1; 893 else 894 return 0; 895} 896 897static int 898decimal(const char *str, int *num, int deflt) 899{ 900 int acc = 0, c; 901 char *cp; 902 903 while (1) { 904 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 905 fflush(stdout); 906 if (fgets(lbuf, LBUF, stdin) == NULL) 907 exit(1); 908 lbuf[strlen(lbuf)-1] = 0; 909 910 if (!*lbuf) 911 return 0; 912 913 cp = lbuf; 914 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 915 if (!c) 916 return 0; 917 while ((c = *cp++)) { 918 if (c <= '9' && c >= '0') 919 acc = acc * 10 + c - '0'; 920 else 921 break; 922 } 923 if (c == ' ' || c == '\t') 924 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 925 if (!c) { 926 *num = acc; 927 return 1; 928 } else 929 printf("%s is an invalid decimal number. Try again.\n", 930 lbuf); 931 } 932 933} 934 935static const char * 936get_type(int type) 937{ 938 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 939 int counter = 0; 940 struct part_type *ptr = part_types; 941 942 943 while(counter < numentries) { 944 if(ptr->type == type) 945 return(ptr->name); 946 ptr++; 947 counter++; 948 } 949 return("unknown"); 950} 951 952 953static void 954parse_config_line(char *line, CMD *command) 955{ 956 char *cp, *end; 957 958 cp = line; 959 while (1) { 960 memset(command, 0, sizeof(*command)); 961 962 while (isspace(*cp)) ++cp; 963 if (*cp == '\0' || *cp == '#') 964 break; 965 command->cmd = *cp++; 966 967 /* 968 * Parse args 969 */ 970 while (1) { 971 while (isspace(*cp)) ++cp; 972 if (*cp == '#') 973 break; /* found comment */ 974 if (isalpha(*cp)) 975 command->args[command->n_args].argtype = *cp++; 976 if (!isdigit(*cp)) 977 break; /* assume end of line */ 978 end = NULL; 979 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 980 if (cp == end) 981 break; /* couldn't parse number */ 982 cp = end; 983 command->n_args++; 984 } 985 break; 986 } 987} 988 989 990static int 991process_geometry(CMD *command) 992{ 993 int status = 1, i; 994 995 while (1) { 996 geom_processed = 1; 997 if (part_processed) { 998 warnx( 999 "ERROR line %d: the geometry specification line must occur before\n\ 1000 all partition specifications", 1001 current_line_number); 1002 status = 0; 1003 break; 1004 } 1005 if (command->n_args != 3) { 1006 warnx("ERROR line %d: incorrect number of geometry args", 1007 current_line_number); 1008 status = 0; 1009 break; 1010 } 1011 dos_cyls = 0; 1012 dos_heads = 0; 1013 dos_sectors = 0; 1014 for (i = 0; i < 3; ++i) { 1015 switch (command->args[i].argtype) { 1016 case 'c': 1017 dos_cyls = command->args[i].arg_val; 1018 break; 1019 case 'h': 1020 dos_heads = command->args[i].arg_val; 1021 break; 1022 case 's': 1023 dos_sectors = command->args[i].arg_val; 1024 break; 1025 default: 1026 warnx( 1027 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1028 current_line_number, command->args[i].argtype, 1029 command->args[i].argtype); 1030 status = 0; 1031 break; 1032 } 1033 } 1034 if (status == 0) 1035 break; 1036 1037 dos_cylsecs = dos_heads * dos_sectors; 1038 1039 /* 1040 * Do sanity checks on parameter values 1041 */ 1042 if (dos_cyls == 0) { 1043 warnx("ERROR line %d: number of cylinders not specified", 1044 current_line_number); 1045 status = 0; 1046 } 1047 if (dos_cyls > 1024) { 1048 warnx( 1049 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1050 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1051 is dedicated to FreeBSD)", 1052 current_line_number, dos_cyls); 1053 } 1054 1055 if (dos_heads == 0) { 1056 warnx("ERROR line %d: number of heads not specified", 1057 current_line_number); 1058 status = 0; 1059 } else if (dos_heads > 256) { 1060 warnx("ERROR line %d: number of heads must be within (1-256)", 1061 current_line_number); 1062 status = 0; 1063 } 1064 1065 if (dos_sectors == 0) { 1066 warnx("ERROR line %d: number of sectors not specified", 1067 current_line_number); 1068 status = 0; 1069 } else if (dos_sectors > 63) { 1070 warnx("ERROR line %d: number of sectors must be within (1-63)", 1071 current_line_number); 1072 status = 0; 1073 } 1074 1075 break; 1076 } 1077 return (status); 1078} 1079 1080 1081static int 1082process_partition(CMD *command) 1083{ 1084 int status = 0, partition; 1085 u_int32_t prev_head_boundary, prev_cyl_boundary; 1086 u_int32_t adj_size, max_end; 1087 struct dos_partition *partp; 1088 1089 while (1) { 1090 part_processed = 1; 1091 if (command->n_args != 4) { 1092 warnx("ERROR line %d: incorrect number of partition args", 1093 current_line_number); 1094 break; 1095 } 1096 partition = command->args[0].arg_val; 1097 if (partition < 1 || partition > 4) { 1098 warnx("ERROR line %d: invalid partition number %d", 1099 current_line_number, partition); 1100 break; 1101 } 1102 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1103 bzero((char *)partp, sizeof (struct dos_partition)); 1104 partp->dp_typ = command->args[1].arg_val; 1105 partp->dp_start = command->args[2].arg_val; 1106 partp->dp_size = command->args[3].arg_val; 1107 max_end = partp->dp_start + partp->dp_size; 1108 1109 if (partp->dp_typ == 0) { 1110 /* 1111 * Get out, the partition is marked as unused. 1112 */ 1113 /* 1114 * Insure that it's unused. 1115 */ 1116 bzero((char *)partp, sizeof (struct dos_partition)); 1117 status = 1; 1118 break; 1119 } 1120 1121 /* 1122 * Adjust start upwards, if necessary, to fall on a head boundary. 1123 */ 1124 if (partp->dp_start % dos_sectors != 0) { 1125 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1126 if (max_end < dos_sectors || 1127 prev_head_boundary > max_end - dos_sectors) { 1128 /* 1129 * Can't go past end of partition 1130 */ 1131 warnx( 1132 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1133 a head boundary", 1134 current_line_number, partition); 1135 break; 1136 } 1137 warnx( 1138 "WARNING: adjusting start offset of partition %d\n\ 1139 from %u to %u, to fall on a head boundary", 1140 partition, (u_int)partp->dp_start, 1141 (u_int)(prev_head_boundary + dos_sectors)); 1142 partp->dp_start = prev_head_boundary + dos_sectors; 1143 } 1144 1145 /* 1146 * Adjust size downwards, if necessary, to fall on a cylinder 1147 * boundary. 1148 */ 1149 prev_cyl_boundary = 1150 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1151 if (prev_cyl_boundary > partp->dp_start) 1152 adj_size = prev_cyl_boundary - partp->dp_start; 1153 else { 1154 warnx( 1155 "ERROR: could not adjust partition to start on a head boundary\n\ 1156 and end on a cylinder boundary."); 1157 return (0); 1158 } 1159 if (adj_size != partp->dp_size) { 1160 warnx( 1161 "WARNING: adjusting size of partition %d from %u to %u\n\ 1162 to end on a cylinder boundary", 1163 partition, (u_int)partp->dp_size, (u_int)adj_size); 1164 partp->dp_size = adj_size; 1165 } 1166 if (partp->dp_size == 0) { 1167 warnx("ERROR line %d: size of partition %d is zero", 1168 current_line_number, partition); 1169 break; 1170 } 1171 1172 dos(partp); 1173 status = 1; 1174 break; 1175 } 1176 return (status); 1177} 1178 1179 1180static int 1181process_active(CMD *command) 1182{ 1183 int status = 0, partition, i; 1184 struct dos_partition *partp; 1185 1186 while (1) { 1187 active_processed = 1; 1188 if (command->n_args != 1) { 1189 warnx("ERROR line %d: incorrect number of active args", 1190 current_line_number); 1191 status = 0; 1192 break; 1193 } 1194 partition = command->args[0].arg_val; 1195 if (partition < 1 || partition > 4) { 1196 warnx("ERROR line %d: invalid partition number %d", 1197 current_line_number, partition); 1198 break; 1199 } 1200 /* 1201 * Reset active partition 1202 */ 1203 partp = ((struct dos_partition *) &mboot.parts); 1204 for (i = 0; i < NDOSPART; i++) 1205 partp[i].dp_flag = 0; 1206 partp[partition-1].dp_flag = ACTIVE; 1207 1208 status = 1; 1209 break; 1210 } 1211 return (status); 1212} 1213 1214 1215static int 1216process_line(char *line) 1217{ 1218 CMD command; 1219 int status = 1; 1220 1221 while (1) { 1222 parse_config_line(line, &command); 1223 switch (command.cmd) { 1224 case 0: 1225 /* 1226 * Comment or blank line 1227 */ 1228 break; 1229 case 'g': 1230 /* 1231 * Set geometry 1232 */ 1233 status = process_geometry(&command); 1234 break; 1235 case 'p': 1236 status = process_partition(&command); 1237 break; 1238 case 'a': 1239 status = process_active(&command); 1240 break; 1241 default: 1242 status = 0; 1243 break; 1244 } 1245 break; 1246 } 1247 return (status); 1248} 1249 1250 1251static int 1252read_config(char *config_file) 1253{ 1254 FILE *fp = NULL; 1255 int status = 1; 1256 char buf[1010]; 1257 1258 while (1) { 1259 if (strcmp(config_file, "-") != 0) { 1260 /* 1261 * We're not reading from stdin 1262 */ 1263 if ((fp = fopen(config_file, "r")) == NULL) { 1264 status = 0; 1265 break; 1266 } 1267 } else { 1268 fp = stdin; 1269 } 1270 current_line_number = 0; 1271 while (!feof(fp)) { 1272 if (fgets(buf, sizeof(buf), fp) == NULL) 1273 break; 1274 ++current_line_number; 1275 status = process_line(buf); 1276 if (status == 0) 1277 break; 1278 } 1279 break; 1280 } 1281 if (fp) { 1282 /* 1283 * It doesn't matter if we're reading from stdin, as we've reached EOF 1284 */ 1285 fclose(fp); 1286 } 1287 return (status); 1288} 1289 1290 1291static void 1292reset_boot(void) 1293{ 1294 int i; 1295 struct dos_partition *partp; 1296 1297 init_boot(); 1298 for (i = 0; i < 4; ++i) { 1299 partp = ((struct dos_partition *) &mboot.parts) + i; 1300 bzero((char *)partp, sizeof (struct dos_partition)); 1301 } 1302} 1303 1304static int 1305sanitize_partition(struct dos_partition *partp) 1306{ 1307 u_int32_t prev_head_boundary, prev_cyl_boundary; 1308 u_int32_t max_end, size, start; 1309 1310 start = partp->dp_start; 1311 size = partp->dp_size; 1312 max_end = start + size; 1313 /* Only allow a zero size if the partition is being marked unused. */ 1314 if (size == 0) { 1315 if (start == 0 && partp->dp_typ == 0) 1316 return (1); 1317 warnx("ERROR: size of partition is zero"); 1318 return (0); 1319 } 1320 /* Return if no adjustment is necessary. */ 1321 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1322 return (1); 1323 1324 if (start == 0) { 1325 warnx("WARNING: partition overlaps with partition table"); 1326 if (ok("Correct this automatically?")) 1327 start = dos_sectors; 1328 } 1329 if (start % dos_sectors != 0) 1330 warnx("WARNING: partition does not start on a head boundary"); 1331 if ((start +size) % dos_sectors != 0) 1332 warnx("WARNING: partition does not end on a cylinder boundary"); 1333 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1334 if (!ok("Correct this automatically?")) 1335 return (1); 1336 1337 /* 1338 * Adjust start upwards, if necessary, to fall on a head boundary. 1339 */ 1340 if (start % dos_sectors != 0) { 1341 prev_head_boundary = start / dos_sectors * dos_sectors; 1342 if (max_end < dos_sectors || 1343 prev_head_boundary >= max_end - dos_sectors) { 1344 /* 1345 * Can't go past end of partition 1346 */ 1347 warnx( 1348 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1349 return (0); 1350 } 1351 start = prev_head_boundary + dos_sectors; 1352 } 1353 1354 /* 1355 * Adjust size downwards, if necessary, to fall on a cylinder 1356 * boundary. 1357 */ 1358 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1359 if (prev_cyl_boundary > start) 1360 size = prev_cyl_boundary - start; 1361 else { 1362 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1363 and end on a cylinder boundary."); 1364 return (0); 1365 } 1366 1367 /* Finally, commit any changes to partp and return. */ 1368 if (start != partp->dp_start) { 1369 warnx("WARNING: adjusting start offset of partition to %u", 1370 (u_int)start); 1371 partp->dp_start = start; 1372 } 1373 if (size != partp->dp_size) { 1374 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1375 partp->dp_size = size; 1376 } 1377 1378 return (1); 1379} 1380 1381/* 1382 * Try figuring out the root device's canonical disk name. 1383 * The following choices are considered: 1384 * /dev/ad0s1a => /dev/ad0 1385 * /dev/da0a => /dev/da0 1386 * /dev/vinum/root => /dev/vinum/root 1387 */ 1388static char * 1389get_rootdisk(void) 1390{ 1391 struct statfs rootfs; 1392 regex_t re; 1393#define NMATCHES 2 1394 regmatch_t rm[NMATCHES]; 1395 char *s; 1396 int rv; 1397 1398 if (statfs("/", &rootfs) == -1) 1399 err(1, "statfs(\"/\")"); 1400 1401 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$", 1402 REG_EXTENDED)) != 0) 1403 errx(1, "regcomp() failed (%d)", rv); 1404 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1405 errx(1, 1406"mounted root fs resource doesn't match expectations (regexec returned %d)", 1407 rv); 1408 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1409 errx(1, "out of memory"); 1410 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1411 rm[1].rm_eo - rm[1].rm_so); 1412 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1413 1414 return s; 1415} 1416