fdisk.c revision 181036
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 181036 2008-07-31 00:55:29Z obrien $"); 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 q_flag = 0; /* Be quiet */ 119static int u_flag = 0; /* update partition data */ 120static int s_flag = 0; /* Print a summary and exit */ 121static int t_flag = 0; /* test only */ 122static char *f_flag = NULL; /* Read config info from file */ 123static int v_flag = 0; /* Be verbose */ 124static int print_config_flag = 0; 125 126static struct part_type 127{ 128 unsigned char type; 129 const char *name; 130} part_types[] = { 131 {0x00, "unused"} 132 ,{0x01, "Primary DOS with 12 bit FAT"} 133 ,{0x02, "XENIX / file system"} 134 ,{0x03, "XENIX /usr file system"} 135 ,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"} 136 ,{0x05, "Extended DOS"} 137 ,{0x06, "Primary 'big' DOS (>= 32MB)"} 138 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 139 ,{0x08, "AIX file system or SplitDrive"} 140 ,{0x09, "AIX boot partition or Coherent"} 141 ,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"} 142 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 143 ,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"} 144 ,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"} 145 ,{0x0F, "Extended DOS (LBA)"} 146 ,{0x10, "OPUS"} 147 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 148 ,{0x12, "Compaq diagnostics"} 149 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 150 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 151 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 152 ,{0x18, "AST Windows swapfile"} 153 ,{0x24, "NEC DOS"} 154 ,{0x3C, "PartitionMagic recovery"} 155 ,{0x39, "plan9"} 156 ,{0x40, "VENIX 286"} 157 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 158 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 159 ,{0x43, "Linux native (sharing disk with DRDOS)"} 160 ,{0x4D, "QNX 4.2 Primary"} 161 ,{0x4E, "QNX 4.2 Secondary"} 162 ,{0x4F, "QNX 4.2 Tertiary"} 163 ,{0x50, "DM (disk manager)"} 164 ,{0x51, "DM6 Aux1 (or Novell)"} 165 ,{0x52, "CP/M or Microport SysV/AT"} 166 ,{0x53, "DM6 Aux3"} 167 ,{0x54, "DM6"} 168 ,{0x55, "EZ-Drive (disk manager)"} 169 ,{0x56, "Golden Bow (disk manager)"} 170 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 171 ,{0x61, "SpeedStor"} 172 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"} 173 ,{0x64, "Novell Netware/286 2.xx"} 174 ,{0x65, "Novell Netware/386 3.xx"} 175 ,{0x70, "DiskSecure Multi-Boot"} 176 ,{0x75, "PCIX"} 177 ,{0x77, "QNX4.x"} 178 ,{0x78, "QNX4.x 2nd part"} 179 ,{0x79, "QNX4.x 3rd part"} 180 ,{0x80, "Minix until 1.4a"} 181 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"} 182 ,{0x82, "Linux swap or Solaris x86"} 183 ,{0x83, "Linux native"} 184 ,{0x84, "OS/2 hidden C: drive"} 185 ,{0x85, "Linux extended"} 186 ,{0x86, "NTFS volume set??"} 187 ,{0x87, "NTFS volume set??"} 188 ,{0x93, "Amoeba file system"} 189 ,{0x94, "Amoeba bad block table"} 190 ,{0x9F, "BSD/OS"} 191 ,{0xA0, "Suspend to Disk"} 192 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 193 ,{0xA6, "OpenBSD"} 194 ,{0xA7, "NeXTSTEP"} 195 ,{0xA9, "NetBSD"} 196 ,{0xAC, "IBM JFS"} 197 ,{0xAF, "HFS+"} 198 ,{0xB7, "BSDI BSD/386 file system"} 199 ,{0xB8, "BSDI BSD/386 swap"} 200 ,{0xBE, "Solaris x86 boot"} 201 ,{0xBF, "Solaris x86 (new)"} 202 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 203 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 204 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 205 ,{0xC7, "Syrinx"} 206 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 207 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 208 ,{0xE3, "DOS R/O or SpeedStor"} 209 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 210 ,{0xEB, "BeOS file system"} 211 ,{0xEE, "EFI GPT"} 212 ,{0xEF, "EFI System Partition"} 213 ,{0xF1, "SpeedStor"} 214 ,{0xF2, "DOS 3.3+ Secondary"} 215 ,{0xF4, "SpeedStor large partition"} 216 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 217 ,{0xFF, "Xenix bad blocks table"} 218}; 219 220static void print_s0(int which); 221static void print_part(int i); 222static void init_sector0(unsigned long start); 223static void init_boot(void); 224static void change_part(int i); 225static void print_params(void); 226static void change_active(int which); 227static void change_code(void); 228static void get_params_to_use(void); 229static char *get_rootdisk(void); 230static void dos(struct dos_partition *partp); 231static int open_disk(int flag); 232static ssize_t read_disk(off_t sector, void *buf); 233static int write_disk(off_t sector, void *buf); 234static int get_params(void); 235static int read_s0(void); 236static int write_s0(void); 237static int ok(const char *str); 238static int decimal(const char *str, int *num, int deflt); 239static const char *get_type(int type); 240static int read_config(char *config_file); 241static void reset_boot(void); 242static int sanitize_partition(struct dos_partition *); 243static void usage(void); 244 245int 246main(int argc, char *argv[]) 247{ 248 struct stat sb; 249 int c, i; 250 int partition = -1; 251 struct dos_partition *partp; 252 253 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 254 switch (c) { 255 case 'B': 256 B_flag = 1; 257 break; 258 case 'I': 259 I_flag = 1; 260 break; 261 case 'a': 262 a_flag = 1; 263 break; 264 case 'b': 265 b_flag = optarg; 266 break; 267 case 'f': 268 f_flag = optarg; 269 break; 270 case 'i': 271 i_flag = 1; 272 break; 273 case 'p': 274 print_config_flag = 1; 275 break; 276 case 'q': 277 q_flag = 1; 278 break; 279 case 's': 280 s_flag = 1; 281 break; 282 case 't': 283 t_flag = 1; 284 break; 285 case 'u': 286 u_flag = 1; 287 break; 288 case 'v': 289 v_flag = 1; 290 break; 291 case '1': 292 case '2': 293 case '3': 294 case '4': 295 partition = c - '0'; 296 break; 297 default: 298 usage(); 299 } 300 if (f_flag || i_flag) 301 u_flag = 1; 302 if (t_flag) 303 v_flag = 1; 304 argc -= optind; 305 argv += optind; 306 307 if (argc == 0) { 308 disk = get_rootdisk(); 309 } else { 310 if (stat(argv[0], &sb) == 0) { 311 /* OK, full pathname given */ 312 disk = argv[0]; 313 } else if (errno == ENOENT && argv[0][0] != '/') { 314 /* Try prepending "/dev" */ 315 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 316 if (disk == NULL) 317 errx(1, "out of memory"); 318 } else { 319 /* other stat error, let it fail below */ 320 disk = argv[0]; 321 } 322 } 323 if (open_disk(u_flag) < 0) 324 err(1, "cannot open disk %s", disk); 325 326 /* (abu)use mboot.bootinst to probe for the sector size */ 327 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 328 err(1, "cannot allocate buffer to determine disk sector size"); 329 if (read_disk(0, mboot.bootinst) == -1) 330 errx(1, "could not detect sector size"); 331 free(mboot.bootinst); 332 mboot.bootinst = NULL; 333 334 if (print_config_flag) { 335 if (read_s0()) 336 err(1, "read_s0"); 337 338 printf("# %s\n", disk); 339 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 340 341 for (i = 0; i < NDOSPART; i++) { 342 partp = ((struct dos_partition *)&mboot.parts) + i; 343 344 if (partp->dp_start == 0 && partp->dp_size == 0) 345 continue; 346 347 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 348 (u_long)partp->dp_start, (u_long)partp->dp_size); 349 350 /* Fill flags for the partition. */ 351 if (partp->dp_flag & 0x80) 352 printf("a %d\n", i + 1); 353 } 354 exit(0); 355 } 356 if (s_flag) { 357 if (read_s0()) 358 err(1, "read_s0"); 359 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 360 dos_sectors); 361 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 362 for (i = 0; i < NDOSPART; i++) { 363 partp = ((struct dos_partition *) &mboot.parts) + i; 364 if (partp->dp_start == 0 && partp->dp_size == 0) 365 continue; 366 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 367 (u_long) partp->dp_start, 368 (u_long) partp->dp_size, partp->dp_typ, 369 partp->dp_flag); 370 } 371 exit(0); 372 } 373 374 printf("******* Working on device %s *******\n",disk); 375 376 if (I_flag) { 377 read_s0(); 378 reset_boot(); 379 partp = (struct dos_partition *) (&mboot.parts[0]); 380 partp->dp_typ = DOSPTYP_386BSD; 381 partp->dp_flag = ACTIVE; 382 partp->dp_start = dos_sectors; 383 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 384 dos_sectors; 385 dos(partp); 386 if (v_flag) 387 print_s0(-1); 388 if (!t_flag) 389 write_s0(); 390 exit(0); 391 } 392 if (f_flag) { 393 if (read_s0() || i_flag) 394 reset_boot(); 395 if (!read_config(f_flag)) 396 exit(1); 397 if (v_flag) 398 print_s0(-1); 399 if (!t_flag) 400 write_s0(); 401 } else { 402 if(u_flag) 403 get_params_to_use(); 404 else 405 print_params(); 406 407 if (read_s0()) 408 init_sector0(dos_sectors); 409 410 printf("Media sector size is %d\n", secsize); 411 printf("Warning: BIOS sector numbering starts with sector 1\n"); 412 printf("Information from DOS bootblock is:\n"); 413 if (partition == -1) 414 for (i = 1; i <= NDOSPART; i++) 415 change_part(i); 416 else 417 change_part(partition); 418 419 if (u_flag || a_flag) 420 change_active(partition); 421 422 if (B_flag) 423 change_code(); 424 425 if (u_flag || a_flag || B_flag) { 426 if (!t_flag) { 427 printf("\nWe haven't changed the partition table yet. "); 428 printf("This is your last chance.\n"); 429 } 430 print_s0(-1); 431 if (!t_flag) { 432 if (ok("Should we write new partition table?")) 433 write_s0(); 434 } else { 435 printf("\n-t flag specified -- partition table not written.\n"); 436 } 437 } 438 } 439 440 exit(0); 441} 442 443static void 444usage() 445{ 446 fprintf(stderr, "%s%s", 447 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 448 " fdisk -f configfile [-itv] [disk]\n"); 449 exit(1); 450} 451 452static void 453print_s0(int which) 454{ 455 int i; 456 457 print_params(); 458 printf("Information from DOS bootblock is:\n"); 459 if (which == -1) 460 for (i = 1; i <= NDOSPART; i++) 461 printf("%d: ", i), print_part(i); 462 else 463 print_part(which); 464} 465 466static struct dos_partition mtpart; 467 468static void 469print_part(int i) 470{ 471 struct dos_partition *partp; 472 u_int64_t part_mb; 473 474 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 475 476 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 477 printf("<UNUSED>\n"); 478 return; 479 } 480 /* 481 * Be careful not to overflow. 482 */ 483 part_mb = partp->dp_size; 484 part_mb *= secsize; 485 part_mb /= (1024 * 1024); 486 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 487 get_type(partp->dp_typ)); 488 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 489 (u_long)partp->dp_start, 490 (u_long)partp->dp_size, 491 (uintmax_t)part_mb, 492 partp->dp_flag, 493 partp->dp_flag == ACTIVE ? " (active)" : ""); 494 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 495 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 496 ,partp->dp_shd 497 ,DPSECT(partp->dp_ssect) 498 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 499 ,partp->dp_ehd 500 ,DPSECT(partp->dp_esect)); 501} 502 503 504static void 505init_boot(void) 506{ 507#ifndef __ia64__ 508 const char *fname; 509 int fdesc, n; 510 struct stat sb; 511 512 fname = b_flag ? b_flag : "/boot/mbr"; 513 if ((fdesc = open(fname, O_RDONLY)) == -1 || 514 fstat(fdesc, &sb) == -1) 515 err(1, "%s", fname); 516 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 517 errx(1, "%s: length must be a multiple of sector size", fname); 518 if (mboot.bootinst != NULL) 519 free(mboot.bootinst); 520 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 521 errx(1, "%s: unable to allocate read buffer", fname); 522 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 523 close(fdesc)) 524 err(1, "%s", fname); 525 if (n != mboot.bootinst_size) 526 errx(1, "%s: short read", fname); 527#else 528 if (mboot.bootinst != NULL) 529 free(mboot.bootinst); 530 mboot.bootinst_size = secsize; 531 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 532 errx(1, "unable to allocate boot block buffer"); 533 memset(mboot.bootinst, 0, mboot.bootinst_size); 534 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 535#endif 536} 537 538 539static void 540init_sector0(unsigned long start) 541{ 542 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]); 543 544 init_boot(); 545 546 partp->dp_typ = DOSPTYP_386BSD; 547 partp->dp_flag = ACTIVE; 548 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 549 if(start == 0) 550 start = dos_sectors; 551 partp->dp_start = start; 552 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 553 554 dos(partp); 555} 556 557static void 558change_part(int i) 559{ 560 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 561 562 printf("The data for partition %d is:\n", i); 563 print_part(i); 564 565 if (u_flag && ok("Do you want to change it?")) { 566 int tmp; 567 568 if (i_flag) { 569 bzero((char *)partp, sizeof (struct dos_partition)); 570 if (i == 1) { 571 init_sector0(1); 572 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 573 print_part(i); 574 } 575 } 576 577 do { 578 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 579 Decimal("start", partp->dp_start, tmp); 580 Decimal("size", partp->dp_size, tmp); 581 if (!sanitize_partition(partp)) { 582 warnx("ERROR: failed to adjust; setting sysid to 0"); 583 partp->dp_typ = 0; 584 } 585 586 if (ok("Explicitly specify beg/end address ?")) 587 { 588 int tsec,tcyl,thd; 589 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 590 thd = partp->dp_shd; 591 tsec = DPSECT(partp->dp_ssect); 592 Decimal("beginning cylinder", tcyl, tmp); 593 Decimal("beginning head", thd, tmp); 594 Decimal("beginning sector", tsec, tmp); 595 partp->dp_scyl = DOSCYL(tcyl); 596 partp->dp_ssect = DOSSECT(tsec,tcyl); 597 partp->dp_shd = thd; 598 599 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 600 thd = partp->dp_ehd; 601 tsec = DPSECT(partp->dp_esect); 602 Decimal("ending cylinder", tcyl, tmp); 603 Decimal("ending head", thd, tmp); 604 Decimal("ending sector", tsec, tmp); 605 partp->dp_ecyl = DOSCYL(tcyl); 606 partp->dp_esect = DOSSECT(tsec,tcyl); 607 partp->dp_ehd = thd; 608 } else 609 dos(partp); 610 611 print_part(i); 612 } while (!ok("Are we happy with this entry?")); 613 } 614} 615 616static void 617print_params() 618{ 619 printf("parameters extracted from in-core disklabel are:\n"); 620 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 621 ,cyls,heads,sectors,cylsecs); 622 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 623 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 624 printf("parameters to be used for BIOS calculations are:\n"); 625 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 626 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 627} 628 629static void 630change_active(int which) 631{ 632 struct dos_partition *partp = &mboot.parts[0]; 633 int active, i, new, tmp; 634 635 active = -1; 636 for (i = 0; i < NDOSPART; i++) { 637 if ((partp[i].dp_flag & ACTIVE) == 0) 638 continue; 639 printf("Partition %d is marked active\n", i + 1); 640 if (active == -1) 641 active = i + 1; 642 } 643 if (a_flag && which != -1) 644 active = which; 645 else if (active == -1) 646 active = 1; 647 648 if (!ok("Do you want to change the active partition?")) 649 return; 650setactive: 651 do { 652 new = active; 653 Decimal("active partition", new, tmp); 654 if (new < 1 || new > 4) { 655 printf("Active partition number must be in range 1-4." 656 " Try again.\n"); 657 goto setactive; 658 } 659 active = new; 660 } while (!ok("Are you happy with this choice")); 661 for (i = 0; i < NDOSPART; i++) 662 partp[i].dp_flag = 0; 663 if (active > 0 && active <= NDOSPART) 664 partp[active-1].dp_flag = ACTIVE; 665} 666 667static void 668change_code() 669{ 670 if (ok("Do you want to change the boot code?")) 671 init_boot(); 672} 673 674void 675get_params_to_use() 676{ 677 int tmp; 678 print_params(); 679 if (ok("Do you want to change our idea of what BIOS thinks ?")) 680 { 681 do 682 { 683 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 684 Decimal("BIOS's idea of #heads", dos_heads, tmp); 685 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 686 dos_cylsecs = dos_heads * dos_sectors; 687 print_params(); 688 } 689 while(!ok("Are you happy with this choice")); 690 } 691} 692 693 694/***********************************************\ 695* Change real numbers into strange dos numbers * 696\***********************************************/ 697static void 698dos(struct dos_partition *partp) 699{ 700 int cy, sec; 701 u_int32_t end; 702 703 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 704 memcpy(partp, &mtpart, sizeof(*partp)); 705 return; 706 } 707 708 /* Start c/h/s. */ 709 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 710 cy = partp->dp_start / dos_cylsecs; 711 sec = partp->dp_start % dos_sectors + 1; 712 partp->dp_scyl = DOSCYL(cy); 713 partp->dp_ssect = DOSSECT(sec, cy); 714 715 /* End c/h/s. */ 716 end = partp->dp_start + partp->dp_size - 1; 717 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 718 cy = end / dos_cylsecs; 719 sec = end % dos_sectors + 1; 720 partp->dp_ecyl = DOSCYL(cy); 721 partp->dp_esect = DOSSECT(sec, cy); 722} 723 724static int 725open_disk(int flag) 726{ 727 struct stat st; 728 int rwmode; 729 730 if (stat(disk, &st) == -1) { 731 if (errno == ENOENT) 732 return -2; 733 warnx("can't get file status of %s", disk); 734 return -1; 735 } 736 if ( !(st.st_mode & S_IFCHR) ) 737 warnx("device %s is not character special", disk); 738 rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY; 739 fd = open(disk, rwmode); 740 if (fd == -1 && errno == EPERM && rwmode == O_RDWR) 741 fd = open(disk, O_RDONLY); 742 if (fd == -1 && errno == ENXIO) 743 return -2; 744 if (fd == -1) { 745 warnx("can't open device %s", disk); 746 return -1; 747 } 748 if (get_params() == -1) { 749 warnx("can't get disk parameters on %s", disk); 750 return -1; 751 } 752 return fd; 753} 754 755static ssize_t 756read_disk(off_t sector, void *buf) 757{ 758 759 lseek(fd, (sector * 512), 0); 760 if (secsize == 0) 761 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 762 secsize *= 2) { 763 /* try the read */ 764 int size = read(fd, buf, secsize); 765 if (size == secsize) 766 /* it worked so return */ 767 return secsize; 768 } 769 else 770 return read(fd, buf, secsize); 771 772 /* we failed to read at any of the sizes */ 773 return -1; 774} 775 776static int 777write_disk(off_t sector, void *buf) 778{ 779 int error; 780 struct gctl_req *grq; 781 const char *q; 782 char fbuf[BUFSIZ]; 783 int i, fdw; 784 785 grq = gctl_get_handle(); 786 gctl_ro_param(grq, "verb", -1, "write MBR"); 787 gctl_ro_param(grq, "class", -1, "MBR"); 788 q = strrchr(disk, '/'); 789 if (q == NULL) 790 q = disk; 791 else 792 q++; 793 gctl_ro_param(grq, "geom", -1, q); 794 gctl_ro_param(grq, "data", secsize, buf); 795 q = gctl_issue(grq); 796 if (q == NULL) { 797 gctl_free(grq); 798 return(0); 799 } 800 if (!q_flag) /* GEOM errors are benign, not all devices supported */ 801 warnx("%s", q); 802 gctl_free(grq); 803 804 error = pwrite(fd, buf, secsize, (sector * 512)); 805 if (error == secsize) 806 return (0); 807 808 for (i = 1; i < 5; i++) { 809 sprintf(fbuf, "%ss%d", disk, i); 810 fdw = open(fbuf, O_RDWR, 0); 811 if (fdw < 0) 812 continue; 813 error = ioctl(fdw, DIOCSMBR, buf); 814 close(fdw); 815 if (error == 0) 816 return (0); 817 } 818 warnx("Failed to write sector zero"); 819 return(EINVAL); 820} 821 822static int 823get_params() 824{ 825 int error; 826 u_int u; 827 off_t o; 828 829 error = ioctl(fd, DIOCGFWSECTORS, &u); 830 if (error == 0) 831 sectors = dos_sectors = u; 832 else 833 sectors = dos_sectors = 63; 834 835 error = ioctl(fd, DIOCGFWHEADS, &u); 836 if (error == 0) 837 heads = dos_heads = u; 838 else 839 heads = dos_heads = 255; 840 841 dos_cylsecs = cylsecs = heads * sectors; 842 disksecs = cyls * heads * sectors; 843 844 error = ioctl(fd, DIOCGSECTORSIZE, &u); 845 if (error != 0 || u == 0) 846 u = 512; 847 else 848 secsize = u; 849 850 error = ioctl(fd, DIOCGMEDIASIZE, &o); 851 if (error == 0) { 852 disksecs = o / u; 853 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 854 } 855 856 return (disksecs); 857} 858 859 860static int 861read_s0() 862{ 863 int i; 864 865 mboot.bootinst_size = secsize; 866 if (mboot.bootinst != NULL) 867 free(mboot.bootinst); 868 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 869 warnx("unable to allocate buffer to read fdisk " 870 "partition table"); 871 return -1; 872 } 873 if (read_disk(0, mboot.bootinst) == -1) { 874 warnx("can't read fdisk partition table"); 875 return -1; 876 } 877 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 878 warnx("invalid fdisk partition table found"); 879 /* So should we initialize things */ 880 return -1; 881 } 882 for (i = 0; i < NDOSPART; i++) 883 dos_partition_dec( 884 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 885 &mboot.parts[i]); 886 return 0; 887} 888 889static int 890write_s0() 891{ 892 int sector, i; 893 894 if (iotest) { 895 print_s0(-1); 896 return 0; 897 } 898 for(i = 0; i < NDOSPART; i++) 899 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 900 &mboot.parts[i]); 901 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 902 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 903 if (write_disk(sector, 904 &mboot.bootinst[sector * secsize]) == -1) { 905 warn("can't write fdisk partition table"); 906 return -1; 907 } 908 return(0); 909} 910 911 912static int 913ok(const char *str) 914{ 915 printf("%s [n] ", str); 916 fflush(stdout); 917 if (fgets(lbuf, LBUF, stdin) == NULL) 918 exit(1); 919 lbuf[strlen(lbuf)-1] = 0; 920 921 if (*lbuf && 922 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 923 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 924 return 1; 925 else 926 return 0; 927} 928 929static int 930decimal(const char *str, int *num, int deflt) 931{ 932 int acc = 0, c; 933 char *cp; 934 935 while (1) { 936 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 937 fflush(stdout); 938 if (fgets(lbuf, LBUF, stdin) == NULL) 939 exit(1); 940 lbuf[strlen(lbuf)-1] = 0; 941 942 if (!*lbuf) 943 return 0; 944 945 cp = lbuf; 946 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 947 if (!c) 948 return 0; 949 while ((c = *cp++)) { 950 if (c <= '9' && c >= '0') 951 acc = acc * 10 + c - '0'; 952 else 953 break; 954 } 955 if (c == ' ' || c == '\t') 956 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 957 if (!c) { 958 *num = acc; 959 return 1; 960 } else 961 printf("%s is an invalid decimal number. Try again.\n", 962 lbuf); 963 } 964 965} 966 967static const char * 968get_type(int type) 969{ 970 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 971 int counter = 0; 972 struct part_type *ptr = part_types; 973 974 975 while(counter < numentries) { 976 if(ptr->type == type) 977 return(ptr->name); 978 ptr++; 979 counter++; 980 } 981 return("unknown"); 982} 983 984 985static void 986parse_config_line(char *line, CMD *command) 987{ 988 char *cp, *end; 989 990 cp = line; 991 while (1) { 992 memset(command, 0, sizeof(*command)); 993 994 while (isspace(*cp)) ++cp; 995 if (*cp == '\0' || *cp == '#') 996 break; 997 command->cmd = *cp++; 998 999 /* 1000 * Parse args 1001 */ 1002 while (1) { 1003 while (isspace(*cp)) ++cp; 1004 if (*cp == '#') 1005 break; /* found comment */ 1006 if (isalpha(*cp)) 1007 command->args[command->n_args].argtype = *cp++; 1008 if (!isdigit(*cp)) 1009 break; /* assume end of line */ 1010 end = NULL; 1011 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 1012 if (cp == end) 1013 break; /* couldn't parse number */ 1014 cp = end; 1015 command->n_args++; 1016 } 1017 break; 1018 } 1019} 1020 1021 1022static int 1023process_geometry(CMD *command) 1024{ 1025 int status = 1, i; 1026 1027 while (1) { 1028 geom_processed = 1; 1029 if (part_processed) { 1030 warnx( 1031 "ERROR line %d: the geometry specification line must occur before\n\ 1032 all partition specifications", 1033 current_line_number); 1034 status = 0; 1035 break; 1036 } 1037 if (command->n_args != 3) { 1038 warnx("ERROR line %d: incorrect number of geometry args", 1039 current_line_number); 1040 status = 0; 1041 break; 1042 } 1043 dos_cyls = 0; 1044 dos_heads = 0; 1045 dos_sectors = 0; 1046 for (i = 0; i < 3; ++i) { 1047 switch (command->args[i].argtype) { 1048 case 'c': 1049 dos_cyls = command->args[i].arg_val; 1050 break; 1051 case 'h': 1052 dos_heads = command->args[i].arg_val; 1053 break; 1054 case 's': 1055 dos_sectors = command->args[i].arg_val; 1056 break; 1057 default: 1058 warnx( 1059 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1060 current_line_number, command->args[i].argtype, 1061 command->args[i].argtype); 1062 status = 0; 1063 break; 1064 } 1065 } 1066 if (status == 0) 1067 break; 1068 1069 dos_cylsecs = dos_heads * dos_sectors; 1070 1071 /* 1072 * Do sanity checks on parameter values 1073 */ 1074 if (dos_cyls == 0) { 1075 warnx("ERROR line %d: number of cylinders not specified", 1076 current_line_number); 1077 status = 0; 1078 } 1079 if (dos_cyls > 1024) { 1080 warnx( 1081 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1082 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1083 is dedicated to FreeBSD)", 1084 current_line_number, dos_cyls); 1085 } 1086 1087 if (dos_heads == 0) { 1088 warnx("ERROR line %d: number of heads not specified", 1089 current_line_number); 1090 status = 0; 1091 } else if (dos_heads > 256) { 1092 warnx("ERROR line %d: number of heads must be within (1-256)", 1093 current_line_number); 1094 status = 0; 1095 } 1096 1097 if (dos_sectors == 0) { 1098 warnx("ERROR line %d: number of sectors not specified", 1099 current_line_number); 1100 status = 0; 1101 } else if (dos_sectors > 63) { 1102 warnx("ERROR line %d: number of sectors must be within (1-63)", 1103 current_line_number); 1104 status = 0; 1105 } 1106 1107 break; 1108 } 1109 return (status); 1110} 1111 1112 1113static int 1114process_partition(CMD *command) 1115{ 1116 int status = 0, partition; 1117 u_int32_t prev_head_boundary, prev_cyl_boundary; 1118 u_int32_t adj_size, max_end; 1119 struct dos_partition *partp; 1120 1121 while (1) { 1122 part_processed = 1; 1123 if (command->n_args != 4) { 1124 warnx("ERROR line %d: incorrect number of partition args", 1125 current_line_number); 1126 break; 1127 } 1128 partition = command->args[0].arg_val; 1129 if (partition < 1 || partition > 4) { 1130 warnx("ERROR line %d: invalid partition number %d", 1131 current_line_number, partition); 1132 break; 1133 } 1134 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1135 bzero((char *)partp, sizeof (struct dos_partition)); 1136 partp->dp_typ = command->args[1].arg_val; 1137 partp->dp_start = command->args[2].arg_val; 1138 partp->dp_size = command->args[3].arg_val; 1139 max_end = partp->dp_start + partp->dp_size; 1140 1141 if (partp->dp_typ == 0) { 1142 /* 1143 * Get out, the partition is marked as unused. 1144 */ 1145 /* 1146 * Insure that it's unused. 1147 */ 1148 bzero((char *)partp, sizeof (struct dos_partition)); 1149 status = 1; 1150 break; 1151 } 1152 1153 /* 1154 * Adjust start upwards, if necessary, to fall on a head boundary. 1155 */ 1156 if (partp->dp_start % dos_sectors != 0) { 1157 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1158 if (max_end < dos_sectors || 1159 prev_head_boundary > max_end - dos_sectors) { 1160 /* 1161 * Can't go past end of partition 1162 */ 1163 warnx( 1164 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1165 a head boundary", 1166 current_line_number, partition); 1167 break; 1168 } 1169 warnx( 1170 "WARNING: adjusting start offset of partition %d\n\ 1171 from %u to %u, to fall on a head boundary", 1172 partition, (u_int)partp->dp_start, 1173 (u_int)(prev_head_boundary + dos_sectors)); 1174 partp->dp_start = prev_head_boundary + dos_sectors; 1175 } 1176 1177 /* 1178 * Adjust size downwards, if necessary, to fall on a cylinder 1179 * boundary. 1180 */ 1181 prev_cyl_boundary = 1182 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1183 if (prev_cyl_boundary > partp->dp_start) 1184 adj_size = prev_cyl_boundary - partp->dp_start; 1185 else { 1186 warnx( 1187 "ERROR: could not adjust partition to start on a head boundary\n\ 1188 and end on a cylinder boundary."); 1189 return (0); 1190 } 1191 if (adj_size != partp->dp_size) { 1192 warnx( 1193 "WARNING: adjusting size of partition %d from %u to %u\n\ 1194 to end on a cylinder boundary", 1195 partition, (u_int)partp->dp_size, (u_int)adj_size); 1196 partp->dp_size = adj_size; 1197 } 1198 if (partp->dp_size == 0) { 1199 warnx("ERROR line %d: size of partition %d is zero", 1200 current_line_number, partition); 1201 break; 1202 } 1203 1204 dos(partp); 1205 status = 1; 1206 break; 1207 } 1208 return (status); 1209} 1210 1211 1212static int 1213process_active(CMD *command) 1214{ 1215 int status = 0, partition, i; 1216 struct dos_partition *partp; 1217 1218 while (1) { 1219 active_processed = 1; 1220 if (command->n_args != 1) { 1221 warnx("ERROR line %d: incorrect number of active args", 1222 current_line_number); 1223 status = 0; 1224 break; 1225 } 1226 partition = command->args[0].arg_val; 1227 if (partition < 1 || partition > 4) { 1228 warnx("ERROR line %d: invalid partition number %d", 1229 current_line_number, partition); 1230 break; 1231 } 1232 /* 1233 * Reset active partition 1234 */ 1235 partp = ((struct dos_partition *) &mboot.parts); 1236 for (i = 0; i < NDOSPART; i++) 1237 partp[i].dp_flag = 0; 1238 partp[partition-1].dp_flag = ACTIVE; 1239 1240 status = 1; 1241 break; 1242 } 1243 return (status); 1244} 1245 1246 1247static int 1248process_line(char *line) 1249{ 1250 CMD command; 1251 int status = 1; 1252 1253 while (1) { 1254 parse_config_line(line, &command); 1255 switch (command.cmd) { 1256 case 0: 1257 /* 1258 * Comment or blank line 1259 */ 1260 break; 1261 case 'g': 1262 /* 1263 * Set geometry 1264 */ 1265 status = process_geometry(&command); 1266 break; 1267 case 'p': 1268 status = process_partition(&command); 1269 break; 1270 case 'a': 1271 status = process_active(&command); 1272 break; 1273 default: 1274 status = 0; 1275 break; 1276 } 1277 break; 1278 } 1279 return (status); 1280} 1281 1282 1283static int 1284read_config(char *config_file) 1285{ 1286 FILE *fp = NULL; 1287 int status = 1; 1288 char buf[1010]; 1289 1290 while (1) { 1291 if (strcmp(config_file, "-") != 0) { 1292 /* 1293 * We're not reading from stdin 1294 */ 1295 if ((fp = fopen(config_file, "r")) == NULL) { 1296 status = 0; 1297 break; 1298 } 1299 } else { 1300 fp = stdin; 1301 } 1302 current_line_number = 0; 1303 while (!feof(fp)) { 1304 if (fgets(buf, sizeof(buf), fp) == NULL) 1305 break; 1306 ++current_line_number; 1307 status = process_line(buf); 1308 if (status == 0) 1309 break; 1310 } 1311 break; 1312 } 1313 if (fp) { 1314 /* 1315 * It doesn't matter if we're reading from stdin, as we've reached EOF 1316 */ 1317 fclose(fp); 1318 } 1319 return (status); 1320} 1321 1322 1323static void 1324reset_boot(void) 1325{ 1326 int i; 1327 struct dos_partition *partp; 1328 1329 init_boot(); 1330 for (i = 0; i < 4; ++i) { 1331 partp = ((struct dos_partition *) &mboot.parts) + i; 1332 bzero((char *)partp, sizeof (struct dos_partition)); 1333 } 1334} 1335 1336static int 1337sanitize_partition(struct dos_partition *partp) 1338{ 1339 u_int32_t prev_head_boundary, prev_cyl_boundary; 1340 u_int32_t max_end, size, start; 1341 1342 start = partp->dp_start; 1343 size = partp->dp_size; 1344 max_end = start + size; 1345 /* Only allow a zero size if the partition is being marked unused. */ 1346 if (size == 0) { 1347 if (start == 0 && partp->dp_typ == 0) 1348 return (1); 1349 warnx("ERROR: size of partition is zero"); 1350 return (0); 1351 } 1352 /* Return if no adjustment is necessary. */ 1353 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1354 return (1); 1355 1356 if (start == 0) { 1357 warnx("WARNING: partition overlaps with partition table"); 1358 if (ok("Correct this automatically?")) 1359 start = dos_sectors; 1360 } 1361 if (start % dos_sectors != 0) 1362 warnx("WARNING: partition does not start on a head boundary"); 1363 if ((start +size) % dos_sectors != 0) 1364 warnx("WARNING: partition does not end on a cylinder boundary"); 1365 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1366 if (!ok("Correct this automatically?")) 1367 return (1); 1368 1369 /* 1370 * Adjust start upwards, if necessary, to fall on a head boundary. 1371 */ 1372 if (start % dos_sectors != 0) { 1373 prev_head_boundary = start / dos_sectors * dos_sectors; 1374 if (max_end < dos_sectors || 1375 prev_head_boundary >= max_end - dos_sectors) { 1376 /* 1377 * Can't go past end of partition 1378 */ 1379 warnx( 1380 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1381 return (0); 1382 } 1383 start = prev_head_boundary + dos_sectors; 1384 } 1385 1386 /* 1387 * Adjust size downwards, if necessary, to fall on a cylinder 1388 * boundary. 1389 */ 1390 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1391 if (prev_cyl_boundary > start) 1392 size = prev_cyl_boundary - start; 1393 else { 1394 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1395 and end on a cylinder boundary."); 1396 return (0); 1397 } 1398 1399 /* Finally, commit any changes to partp and return. */ 1400 if (start != partp->dp_start) { 1401 warnx("WARNING: adjusting start offset of partition to %u", 1402 (u_int)start); 1403 partp->dp_start = start; 1404 } 1405 if (size != partp->dp_size) { 1406 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1407 partp->dp_size = size; 1408 } 1409 1410 return (1); 1411} 1412 1413/* 1414 * Try figuring out the root device's canonical disk name. 1415 * The following choices are considered: 1416 * /dev/ad0s1a => /dev/ad0 1417 * /dev/da0a => /dev/da0 1418 * /dev/vinum/root => /dev/vinum/root 1419 */ 1420static char * 1421get_rootdisk(void) 1422{ 1423 struct statfs rootfs; 1424 regex_t re; 1425#define NMATCHES 2 1426 regmatch_t rm[NMATCHES]; 1427 char *s; 1428 int rv; 1429 1430 if (statfs("/", &rootfs) == -1) 1431 err(1, "statfs(\"/\")"); 1432 1433 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$", 1434 REG_EXTENDED)) != 0) 1435 errx(1, "regcomp() failed (%d)", rv); 1436 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1437 errx(1, 1438"mounted root fs resource doesn't match expectations (regexec returned %d)", 1439 rv); 1440 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1441 errx(1, "out of memory"); 1442 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1443 rm[1].rm_eo - rm[1].rm_so); 1444 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1445 1446 return s; 1447} 1448