fdisk.c revision 169324
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 169324 2007-05-06 18:48:30Z andre $"); 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 ,{0xAF, "HFS+"} 197 ,{0xB7, "BSDI BSD/386 file system"} 198 ,{0xB8, "BSDI BSD/386 swap"} 199 ,{0xBE, "Solaris x86 boot"} 200 ,{0xBF, "Solaris x86 (new)"} 201 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 202 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 203 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 204 ,{0xC7, "Syrinx"} 205 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 206 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 207 ,{0xE3, "DOS R/O or SpeedStor"} 208 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 209 ,{0xEB, "BeOS file system"} 210 ,{0xEE, "EFI GPT"} 211 ,{0xEF, "EFI System Partition"} 212 ,{0xF1, "SpeedStor"} 213 ,{0xF2, "DOS 3.3+ Secondary"} 214 ,{0xF4, "SpeedStor large partition"} 215 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 216 ,{0xFF, "Xenix bad blocks table"} 217}; 218 219static void print_s0(int which); 220static void print_part(int i); 221static void init_sector0(unsigned long start); 222static void init_boot(void); 223static void change_part(int i); 224static void print_params(void); 225static void change_active(int which); 226static void change_code(void); 227static void get_params_to_use(void); 228static char *get_rootdisk(void); 229static void dos(struct dos_partition *partp); 230static int open_disk(int flag); 231static ssize_t read_disk(off_t sector, void *buf); 232static int write_disk(off_t sector, void *buf); 233static int get_params(void); 234static int read_s0(void); 235static int write_s0(void); 236static int ok(const char *str); 237static int decimal(const char *str, int *num, int deflt); 238static const char *get_type(int type); 239static int read_config(char *config_file); 240static void reset_boot(void); 241static int sanitize_partition(struct dos_partition *); 242static void usage(void); 243 244int 245main(int argc, char *argv[]) 246{ 247 struct stat sb; 248 int c, i; 249 int partition = -1; 250 struct dos_partition *partp; 251 252 while ((c = getopt(argc, argv, "BIab:f:ipstuv1234")) != -1) 253 switch (c) { 254 case 'B': 255 B_flag = 1; 256 break; 257 case 'I': 258 I_flag = 1; 259 break; 260 case 'a': 261 a_flag = 1; 262 break; 263 case 'b': 264 b_flag = optarg; 265 break; 266 case 'f': 267 f_flag = optarg; 268 break; 269 case 'i': 270 i_flag = 1; 271 break; 272 case 'p': 273 print_config_flag = 1; 274 break; 275 case 's': 276 s_flag = 1; 277 break; 278 case 't': 279 t_flag = 1; 280 break; 281 case 'u': 282 u_flag = 1; 283 break; 284 case 'v': 285 v_flag = 1; 286 break; 287 case '1': 288 case '2': 289 case '3': 290 case '4': 291 partition = c - '0'; 292 break; 293 default: 294 usage(); 295 } 296 if (f_flag || i_flag) 297 u_flag = 1; 298 if (t_flag) 299 v_flag = 1; 300 argc -= optind; 301 argv += optind; 302 303 if (argc == 0) { 304 disk = get_rootdisk(); 305 } else { 306 if (stat(argv[0], &sb) == 0) { 307 /* OK, full pathname given */ 308 disk = argv[0]; 309 } else if (errno == ENOENT && argv[0][0] != '/') { 310 /* Try prepending "/dev" */ 311 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 312 if (disk == NULL) 313 errx(1, "out of memory"); 314 } else { 315 /* other stat error, let it fail below */ 316 disk = argv[0]; 317 } 318 } 319 if (open_disk(u_flag) < 0) 320 err(1, "cannot open disk %s", disk); 321 322 /* (abu)use mboot.bootinst to probe for the sector size */ 323 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 324 err(1, "cannot allocate buffer to determine disk sector size"); 325 if (read_disk(0, mboot.bootinst) == -1) 326 errx(1, "could not detect sector size"); 327 free(mboot.bootinst); 328 mboot.bootinst = NULL; 329 330 if (print_config_flag) { 331 if (read_s0()) 332 err(1, "read_s0"); 333 334 printf("# %s\n", disk); 335 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 336 337 for (i = 0; i < NDOSPART; i++) { 338 partp = ((struct dos_partition *)&mboot.parts) + i; 339 340 if (partp->dp_start == 0 && partp->dp_size == 0) 341 continue; 342 343 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 344 (u_long)partp->dp_start, (u_long)partp->dp_size); 345 346 /* Fill flags for the partition. */ 347 if (partp->dp_flag & 0x80) 348 printf("a %d\n", i + 1); 349 } 350 exit(0); 351 } 352 if (s_flag) { 353 if (read_s0()) 354 err(1, "read_s0"); 355 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 356 dos_sectors); 357 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 358 for (i = 0; i < NDOSPART; i++) { 359 partp = ((struct dos_partition *) &mboot.parts) + i; 360 if (partp->dp_start == 0 && partp->dp_size == 0) 361 continue; 362 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 363 (u_long) partp->dp_start, 364 (u_long) partp->dp_size, partp->dp_typ, 365 partp->dp_flag); 366 } 367 exit(0); 368 } 369 370 printf("******* Working on device %s *******\n",disk); 371 372 if (I_flag) { 373 read_s0(); 374 reset_boot(); 375 partp = (struct dos_partition *) (&mboot.parts[0]); 376 partp->dp_typ = DOSPTYP_386BSD; 377 partp->dp_flag = ACTIVE; 378 partp->dp_start = dos_sectors; 379 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 380 dos_sectors; 381 dos(partp); 382 if (v_flag) 383 print_s0(-1); 384 if (!t_flag) 385 write_s0(); 386 exit(0); 387 } 388 if (f_flag) { 389 if (read_s0() || i_flag) 390 reset_boot(); 391 if (!read_config(f_flag)) 392 exit(1); 393 if (v_flag) 394 print_s0(-1); 395 if (!t_flag) 396 write_s0(); 397 } else { 398 if(u_flag) 399 get_params_to_use(); 400 else 401 print_params(); 402 403 if (read_s0()) 404 init_sector0(dos_sectors); 405 406 printf("Media sector size is %d\n", secsize); 407 printf("Warning: BIOS sector numbering starts with sector 1\n"); 408 printf("Information from DOS bootblock is:\n"); 409 if (partition == -1) 410 for (i = 1; i <= NDOSPART; i++) 411 change_part(i); 412 else 413 change_part(partition); 414 415 if (u_flag || a_flag) 416 change_active(partition); 417 418 if (B_flag) 419 change_code(); 420 421 if (u_flag || a_flag || B_flag) { 422 if (!t_flag) { 423 printf("\nWe haven't changed the partition table yet. "); 424 printf("This is your last chance.\n"); 425 } 426 print_s0(-1); 427 if (!t_flag) { 428 if (ok("Should we write new partition table?")) 429 write_s0(); 430 } else { 431 printf("\n-t flag specified -- partition table not written.\n"); 432 } 433 } 434 } 435 436 exit(0); 437} 438 439static void 440usage() 441{ 442 fprintf(stderr, "%s%s", 443 "usage: fdisk [-BIaipstu] [-b bootcode] [-1234] [disk]\n", 444 " fdisk -f configfile [-itv] [disk]\n"); 445 exit(1); 446} 447 448static void 449print_s0(int which) 450{ 451 int i; 452 453 print_params(); 454 printf("Information from DOS bootblock is:\n"); 455 if (which == -1) 456 for (i = 1; i <= NDOSPART; i++) 457 printf("%d: ", i), print_part(i); 458 else 459 print_part(which); 460} 461 462static struct dos_partition mtpart; 463 464static void 465print_part(int i) 466{ 467 struct dos_partition *partp; 468 u_int64_t part_mb; 469 470 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 471 472 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 473 printf("<UNUSED>\n"); 474 return; 475 } 476 /* 477 * Be careful not to overflow. 478 */ 479 part_mb = partp->dp_size; 480 part_mb *= secsize; 481 part_mb /= (1024 * 1024); 482 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 483 get_type(partp->dp_typ)); 484 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 485 (u_long)partp->dp_start, 486 (u_long)partp->dp_size, 487 (uintmax_t)part_mb, 488 partp->dp_flag, 489 partp->dp_flag == ACTIVE ? " (active)" : ""); 490 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 491 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 492 ,partp->dp_shd 493 ,DPSECT(partp->dp_ssect) 494 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 495 ,partp->dp_ehd 496 ,DPSECT(partp->dp_esect)); 497} 498 499 500static void 501init_boot(void) 502{ 503#ifndef __ia64__ 504 const char *fname; 505 int fdesc, n; 506 struct stat sb; 507 508 fname = b_flag ? b_flag : "/boot/mbr"; 509 if ((fdesc = open(fname, O_RDONLY)) == -1 || 510 fstat(fdesc, &sb) == -1) 511 err(1, "%s", fname); 512 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 513 errx(1, "%s: length must be a multiple of sector size", fname); 514 if (mboot.bootinst != NULL) 515 free(mboot.bootinst); 516 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 517 errx(1, "%s: unable to allocate read buffer", fname); 518 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 519 close(fdesc)) 520 err(1, "%s", fname); 521 if (n != mboot.bootinst_size) 522 errx(1, "%s: short read", fname); 523#else 524 if (mboot.bootinst != NULL) 525 free(mboot.bootinst); 526 mboot.bootinst_size = secsize; 527 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 528 errx(1, "unable to allocate boot block buffer"); 529 memset(mboot.bootinst, 0, mboot.bootinst_size); 530 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 531#endif 532} 533 534 535static void 536init_sector0(unsigned long start) 537{ 538 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]); 539 540 init_boot(); 541 542 partp->dp_typ = DOSPTYP_386BSD; 543 partp->dp_flag = ACTIVE; 544 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 545 if(start == 0) 546 start = dos_sectors; 547 partp->dp_start = start; 548 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 549 550 dos(partp); 551} 552 553static void 554change_part(int i) 555{ 556 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 557 558 printf("The data for partition %d is:\n", i); 559 print_part(i); 560 561 if (u_flag && ok("Do you want to change it?")) { 562 int tmp; 563 564 if (i_flag) { 565 bzero((char *)partp, sizeof (struct dos_partition)); 566 if (i == 1) { 567 init_sector0(1); 568 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 569 print_part(i); 570 } 571 } 572 573 do { 574 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 575 Decimal("start", partp->dp_start, tmp); 576 Decimal("size", partp->dp_size, tmp); 577 if (!sanitize_partition(partp)) { 578 warnx("ERROR: failed to adjust; setting sysid to 0"); 579 partp->dp_typ = 0; 580 } 581 582 if (ok("Explicitly specify beg/end address ?")) 583 { 584 int tsec,tcyl,thd; 585 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 586 thd = partp->dp_shd; 587 tsec = DPSECT(partp->dp_ssect); 588 Decimal("beginning cylinder", tcyl, tmp); 589 Decimal("beginning head", thd, tmp); 590 Decimal("beginning sector", tsec, tmp); 591 partp->dp_scyl = DOSCYL(tcyl); 592 partp->dp_ssect = DOSSECT(tsec,tcyl); 593 partp->dp_shd = thd; 594 595 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 596 thd = partp->dp_ehd; 597 tsec = DPSECT(partp->dp_esect); 598 Decimal("ending cylinder", tcyl, tmp); 599 Decimal("ending head", thd, tmp); 600 Decimal("ending sector", tsec, tmp); 601 partp->dp_ecyl = DOSCYL(tcyl); 602 partp->dp_esect = DOSSECT(tsec,tcyl); 603 partp->dp_ehd = thd; 604 } else 605 dos(partp); 606 607 print_part(i); 608 } while (!ok("Are we happy with this entry?")); 609 } 610} 611 612static void 613print_params() 614{ 615 printf("parameters extracted from in-core disklabel are:\n"); 616 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 617 ,cyls,heads,sectors,cylsecs); 618 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 619 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 620 printf("parameters to be used for BIOS calculations are:\n"); 621 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 622 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 623} 624 625static void 626change_active(int which) 627{ 628 struct dos_partition *partp = &mboot.parts[0]; 629 int active, i, new, tmp; 630 631 active = -1; 632 for (i = 0; i < NDOSPART; i++) { 633 if ((partp[i].dp_flag & ACTIVE) == 0) 634 continue; 635 printf("Partition %d is marked active\n", i + 1); 636 if (active == -1) 637 active = i + 1; 638 } 639 if (a_flag && which != -1) 640 active = which; 641 else if (active == -1) 642 active = 1; 643 644 if (!ok("Do you want to change the active partition?")) 645 return; 646setactive: 647 do { 648 new = active; 649 Decimal("active partition", new, tmp); 650 if (new < 1 || new > 4) { 651 printf("Active partition number must be in range 1-4." 652 " Try again.\n"); 653 goto setactive; 654 } 655 active = new; 656 } while (!ok("Are you happy with this choice")); 657 for (i = 0; i < NDOSPART; i++) 658 partp[i].dp_flag = 0; 659 if (active > 0 && active <= NDOSPART) 660 partp[active-1].dp_flag = ACTIVE; 661} 662 663static void 664change_code() 665{ 666 if (ok("Do you want to change the boot code?")) 667 init_boot(); 668} 669 670void 671get_params_to_use() 672{ 673 int tmp; 674 print_params(); 675 if (ok("Do you want to change our idea of what BIOS thinks ?")) 676 { 677 do 678 { 679 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 680 Decimal("BIOS's idea of #heads", dos_heads, tmp); 681 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 682 dos_cylsecs = dos_heads * dos_sectors; 683 print_params(); 684 } 685 while(!ok("Are you happy with this choice")); 686 } 687} 688 689 690/***********************************************\ 691* Change real numbers into strange dos numbers * 692\***********************************************/ 693static void 694dos(struct dos_partition *partp) 695{ 696 int cy, sec; 697 u_int32_t end; 698 699 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 700 memcpy(partp, &mtpart, sizeof(*partp)); 701 return; 702 } 703 704 /* Start c/h/s. */ 705 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 706 cy = partp->dp_start / dos_cylsecs; 707 sec = partp->dp_start % dos_sectors + 1; 708 partp->dp_scyl = DOSCYL(cy); 709 partp->dp_ssect = DOSSECT(sec, cy); 710 711 /* End c/h/s. */ 712 end = partp->dp_start + partp->dp_size - 1; 713 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 714 cy = end / dos_cylsecs; 715 sec = end % dos_sectors + 1; 716 partp->dp_ecyl = DOSCYL(cy); 717 partp->dp_esect = DOSSECT(sec, cy); 718} 719 720static int 721open_disk(int flag) 722{ 723 struct stat st; 724 int rwmode; 725 726 if (stat(disk, &st) == -1) { 727 if (errno == ENOENT) 728 return -2; 729 warnx("can't get file status of %s", disk); 730 return -1; 731 } 732 if ( !(st.st_mode & S_IFCHR) ) 733 warnx("device %s is not character special", disk); 734 rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY; 735 fd = open(disk, rwmode); 736 if (fd == -1 && errno == EPERM && rwmode == O_RDWR) 737 fd = open(disk, O_RDONLY); 738 if (fd == -1 && errno == ENXIO) 739 return -2; 740 if (fd == -1) { 741 warnx("can't open device %s", disk); 742 return -1; 743 } 744 if (get_params() == -1) { 745 warnx("can't get disk parameters on %s", disk); 746 return -1; 747 } 748 return fd; 749} 750 751static ssize_t 752read_disk(off_t sector, void *buf) 753{ 754 755 lseek(fd, (sector * 512), 0); 756 if (secsize == 0) 757 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 758 secsize *= 2) { 759 /* try the read */ 760 int size = read(fd, buf, secsize); 761 if (size == secsize) 762 /* it worked so return */ 763 return secsize; 764 } 765 else 766 return read(fd, buf, secsize); 767 768 /* we failed to read at any of the sizes */ 769 return -1; 770} 771 772static int 773write_disk(off_t sector, void *buf) 774{ 775 int error; 776 struct gctl_req *grq; 777 const char *q; 778 char fbuf[BUFSIZ]; 779 int i, fdw; 780 781 grq = gctl_get_handle(); 782 gctl_ro_param(grq, "verb", -1, "write MBR"); 783 gctl_ro_param(grq, "class", -1, "MBR"); 784 q = strrchr(disk, '/'); 785 if (q == NULL) 786 q = disk; 787 else 788 q++; 789 gctl_ro_param(grq, "geom", -1, q); 790 gctl_ro_param(grq, "data", secsize, buf); 791 q = gctl_issue(grq); 792 if (q == NULL) { 793 gctl_free(grq); 794 return(0); 795 } 796 warnx("%s", q); 797 gctl_free(grq); 798 799 error = pwrite(fd, buf, secsize, (sector * 512)); 800 if (error == secsize) 801 return (0); 802 803 for (i = 1; i < 5; i++) { 804 sprintf(fbuf, "%ss%d", disk, i); 805 fdw = open(fbuf, O_RDWR, 0); 806 if (fdw < 0) 807 continue; 808 error = ioctl(fdw, DIOCSMBR, buf); 809 close(fdw); 810 if (error == 0) 811 return (0); 812 } 813 warnx("Failed to write sector zero"); 814 return(EINVAL); 815} 816 817static int 818get_params() 819{ 820 int error; 821 u_int u; 822 off_t o; 823 824 error = ioctl(fd, DIOCGFWSECTORS, &u); 825 if (error == 0) 826 sectors = dos_sectors = u; 827 else 828 sectors = dos_sectors = 63; 829 830 error = ioctl(fd, DIOCGFWHEADS, &u); 831 if (error == 0) 832 heads = dos_heads = u; 833 else 834 heads = dos_heads = 255; 835 836 dos_cylsecs = cylsecs = heads * sectors; 837 disksecs = cyls * heads * sectors; 838 839 error = ioctl(fd, DIOCGSECTORSIZE, &u); 840 if (error != 0 || u == 0) 841 u = 512; 842 else 843 secsize = u; 844 845 error = ioctl(fd, DIOCGMEDIASIZE, &o); 846 if (error == 0) { 847 disksecs = o / u; 848 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 849 } 850 851 return (disksecs); 852} 853 854 855static int 856read_s0() 857{ 858 int i; 859 860 mboot.bootinst_size = secsize; 861 if (mboot.bootinst != NULL) 862 free(mboot.bootinst); 863 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 864 warnx("unable to allocate buffer to read fdisk " 865 "partition table"); 866 return -1; 867 } 868 if (read_disk(0, mboot.bootinst) == -1) { 869 warnx("can't read fdisk partition table"); 870 return -1; 871 } 872 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 873 warnx("invalid fdisk partition table found"); 874 /* So should we initialize things */ 875 return -1; 876 } 877 for (i = 0; i < NDOSPART; i++) 878 dos_partition_dec( 879 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 880 &mboot.parts[i]); 881 return 0; 882} 883 884static int 885write_s0() 886{ 887 int sector, i; 888 889 if (iotest) { 890 print_s0(-1); 891 return 0; 892 } 893 for(i = 0; i < NDOSPART; i++) 894 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 895 &mboot.parts[i]); 896 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 897 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 898 if (write_disk(sector, 899 &mboot.bootinst[sector * secsize]) == -1) { 900 warn("can't write fdisk partition table"); 901 return -1; 902 } 903 return(0); 904} 905 906 907static int 908ok(const char *str) 909{ 910 printf("%s [n] ", str); 911 fflush(stdout); 912 if (fgets(lbuf, LBUF, stdin) == NULL) 913 exit(1); 914 lbuf[strlen(lbuf)-1] = 0; 915 916 if (*lbuf && 917 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 918 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 919 return 1; 920 else 921 return 0; 922} 923 924static int 925decimal(const char *str, int *num, int deflt) 926{ 927 int acc = 0, c; 928 char *cp; 929 930 while (1) { 931 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 932 fflush(stdout); 933 if (fgets(lbuf, LBUF, stdin) == NULL) 934 exit(1); 935 lbuf[strlen(lbuf)-1] = 0; 936 937 if (!*lbuf) 938 return 0; 939 940 cp = lbuf; 941 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 942 if (!c) 943 return 0; 944 while ((c = *cp++)) { 945 if (c <= '9' && c >= '0') 946 acc = acc * 10 + c - '0'; 947 else 948 break; 949 } 950 if (c == ' ' || c == '\t') 951 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 952 if (!c) { 953 *num = acc; 954 return 1; 955 } else 956 printf("%s is an invalid decimal number. Try again.\n", 957 lbuf); 958 } 959 960} 961 962static const char * 963get_type(int type) 964{ 965 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 966 int counter = 0; 967 struct part_type *ptr = part_types; 968 969 970 while(counter < numentries) { 971 if(ptr->type == type) 972 return(ptr->name); 973 ptr++; 974 counter++; 975 } 976 return("unknown"); 977} 978 979 980static void 981parse_config_line(char *line, CMD *command) 982{ 983 char *cp, *end; 984 985 cp = line; 986 while (1) { 987 memset(command, 0, sizeof(*command)); 988 989 while (isspace(*cp)) ++cp; 990 if (*cp == '\0' || *cp == '#') 991 break; 992 command->cmd = *cp++; 993 994 /* 995 * Parse args 996 */ 997 while (1) { 998 while (isspace(*cp)) ++cp; 999 if (*cp == '#') 1000 break; /* found comment */ 1001 if (isalpha(*cp)) 1002 command->args[command->n_args].argtype = *cp++; 1003 if (!isdigit(*cp)) 1004 break; /* assume end of line */ 1005 end = NULL; 1006 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 1007 if (cp == end) 1008 break; /* couldn't parse number */ 1009 cp = end; 1010 command->n_args++; 1011 } 1012 break; 1013 } 1014} 1015 1016 1017static int 1018process_geometry(CMD *command) 1019{ 1020 int status = 1, i; 1021 1022 while (1) { 1023 geom_processed = 1; 1024 if (part_processed) { 1025 warnx( 1026 "ERROR line %d: the geometry specification line must occur before\n\ 1027 all partition specifications", 1028 current_line_number); 1029 status = 0; 1030 break; 1031 } 1032 if (command->n_args != 3) { 1033 warnx("ERROR line %d: incorrect number of geometry args", 1034 current_line_number); 1035 status = 0; 1036 break; 1037 } 1038 dos_cyls = 0; 1039 dos_heads = 0; 1040 dos_sectors = 0; 1041 for (i = 0; i < 3; ++i) { 1042 switch (command->args[i].argtype) { 1043 case 'c': 1044 dos_cyls = command->args[i].arg_val; 1045 break; 1046 case 'h': 1047 dos_heads = command->args[i].arg_val; 1048 break; 1049 case 's': 1050 dos_sectors = command->args[i].arg_val; 1051 break; 1052 default: 1053 warnx( 1054 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1055 current_line_number, command->args[i].argtype, 1056 command->args[i].argtype); 1057 status = 0; 1058 break; 1059 } 1060 } 1061 if (status == 0) 1062 break; 1063 1064 dos_cylsecs = dos_heads * dos_sectors; 1065 1066 /* 1067 * Do sanity checks on parameter values 1068 */ 1069 if (dos_cyls == 0) { 1070 warnx("ERROR line %d: number of cylinders not specified", 1071 current_line_number); 1072 status = 0; 1073 } 1074 if (dos_cyls > 1024) { 1075 warnx( 1076 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1077 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1078 is dedicated to FreeBSD)", 1079 current_line_number, dos_cyls); 1080 } 1081 1082 if (dos_heads == 0) { 1083 warnx("ERROR line %d: number of heads not specified", 1084 current_line_number); 1085 status = 0; 1086 } else if (dos_heads > 256) { 1087 warnx("ERROR line %d: number of heads must be within (1-256)", 1088 current_line_number); 1089 status = 0; 1090 } 1091 1092 if (dos_sectors == 0) { 1093 warnx("ERROR line %d: number of sectors not specified", 1094 current_line_number); 1095 status = 0; 1096 } else if (dos_sectors > 63) { 1097 warnx("ERROR line %d: number of sectors must be within (1-63)", 1098 current_line_number); 1099 status = 0; 1100 } 1101 1102 break; 1103 } 1104 return (status); 1105} 1106 1107 1108static int 1109process_partition(CMD *command) 1110{ 1111 int status = 0, partition; 1112 u_int32_t prev_head_boundary, prev_cyl_boundary; 1113 u_int32_t adj_size, max_end; 1114 struct dos_partition *partp; 1115 1116 while (1) { 1117 part_processed = 1; 1118 if (command->n_args != 4) { 1119 warnx("ERROR line %d: incorrect number of partition args", 1120 current_line_number); 1121 break; 1122 } 1123 partition = command->args[0].arg_val; 1124 if (partition < 1 || partition > 4) { 1125 warnx("ERROR line %d: invalid partition number %d", 1126 current_line_number, partition); 1127 break; 1128 } 1129 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1130 bzero((char *)partp, sizeof (struct dos_partition)); 1131 partp->dp_typ = command->args[1].arg_val; 1132 partp->dp_start = command->args[2].arg_val; 1133 partp->dp_size = command->args[3].arg_val; 1134 max_end = partp->dp_start + partp->dp_size; 1135 1136 if (partp->dp_typ == 0) { 1137 /* 1138 * Get out, the partition is marked as unused. 1139 */ 1140 /* 1141 * Insure that it's unused. 1142 */ 1143 bzero((char *)partp, sizeof (struct dos_partition)); 1144 status = 1; 1145 break; 1146 } 1147 1148 /* 1149 * Adjust start upwards, if necessary, to fall on a head boundary. 1150 */ 1151 if (partp->dp_start % dos_sectors != 0) { 1152 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1153 if (max_end < dos_sectors || 1154 prev_head_boundary > max_end - dos_sectors) { 1155 /* 1156 * Can't go past end of partition 1157 */ 1158 warnx( 1159 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1160 a head boundary", 1161 current_line_number, partition); 1162 break; 1163 } 1164 warnx( 1165 "WARNING: adjusting start offset of partition %d\n\ 1166 from %u to %u, to fall on a head boundary", 1167 partition, (u_int)partp->dp_start, 1168 (u_int)(prev_head_boundary + dos_sectors)); 1169 partp->dp_start = prev_head_boundary + dos_sectors; 1170 } 1171 1172 /* 1173 * Adjust size downwards, if necessary, to fall on a cylinder 1174 * boundary. 1175 */ 1176 prev_cyl_boundary = 1177 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1178 if (prev_cyl_boundary > partp->dp_start) 1179 adj_size = prev_cyl_boundary - partp->dp_start; 1180 else { 1181 warnx( 1182 "ERROR: could not adjust partition to start on a head boundary\n\ 1183 and end on a cylinder boundary."); 1184 return (0); 1185 } 1186 if (adj_size != partp->dp_size) { 1187 warnx( 1188 "WARNING: adjusting size of partition %d from %u to %u\n\ 1189 to end on a cylinder boundary", 1190 partition, (u_int)partp->dp_size, (u_int)adj_size); 1191 partp->dp_size = adj_size; 1192 } 1193 if (partp->dp_size == 0) { 1194 warnx("ERROR line %d: size of partition %d is zero", 1195 current_line_number, partition); 1196 break; 1197 } 1198 1199 dos(partp); 1200 status = 1; 1201 break; 1202 } 1203 return (status); 1204} 1205 1206 1207static int 1208process_active(CMD *command) 1209{ 1210 int status = 0, partition, i; 1211 struct dos_partition *partp; 1212 1213 while (1) { 1214 active_processed = 1; 1215 if (command->n_args != 1) { 1216 warnx("ERROR line %d: incorrect number of active args", 1217 current_line_number); 1218 status = 0; 1219 break; 1220 } 1221 partition = command->args[0].arg_val; 1222 if (partition < 1 || partition > 4) { 1223 warnx("ERROR line %d: invalid partition number %d", 1224 current_line_number, partition); 1225 break; 1226 } 1227 /* 1228 * Reset active partition 1229 */ 1230 partp = ((struct dos_partition *) &mboot.parts); 1231 for (i = 0; i < NDOSPART; i++) 1232 partp[i].dp_flag = 0; 1233 partp[partition-1].dp_flag = ACTIVE; 1234 1235 status = 1; 1236 break; 1237 } 1238 return (status); 1239} 1240 1241 1242static int 1243process_line(char *line) 1244{ 1245 CMD command; 1246 int status = 1; 1247 1248 while (1) { 1249 parse_config_line(line, &command); 1250 switch (command.cmd) { 1251 case 0: 1252 /* 1253 * Comment or blank line 1254 */ 1255 break; 1256 case 'g': 1257 /* 1258 * Set geometry 1259 */ 1260 status = process_geometry(&command); 1261 break; 1262 case 'p': 1263 status = process_partition(&command); 1264 break; 1265 case 'a': 1266 status = process_active(&command); 1267 break; 1268 default: 1269 status = 0; 1270 break; 1271 } 1272 break; 1273 } 1274 return (status); 1275} 1276 1277 1278static int 1279read_config(char *config_file) 1280{ 1281 FILE *fp = NULL; 1282 int status = 1; 1283 char buf[1010]; 1284 1285 while (1) { 1286 if (strcmp(config_file, "-") != 0) { 1287 /* 1288 * We're not reading from stdin 1289 */ 1290 if ((fp = fopen(config_file, "r")) == NULL) { 1291 status = 0; 1292 break; 1293 } 1294 } else { 1295 fp = stdin; 1296 } 1297 current_line_number = 0; 1298 while (!feof(fp)) { 1299 if (fgets(buf, sizeof(buf), fp) == NULL) 1300 break; 1301 ++current_line_number; 1302 status = process_line(buf); 1303 if (status == 0) 1304 break; 1305 } 1306 break; 1307 } 1308 if (fp) { 1309 /* 1310 * It doesn't matter if we're reading from stdin, as we've reached EOF 1311 */ 1312 fclose(fp); 1313 } 1314 return (status); 1315} 1316 1317 1318static void 1319reset_boot(void) 1320{ 1321 int i; 1322 struct dos_partition *partp; 1323 1324 init_boot(); 1325 for (i = 0; i < 4; ++i) { 1326 partp = ((struct dos_partition *) &mboot.parts) + i; 1327 bzero((char *)partp, sizeof (struct dos_partition)); 1328 } 1329} 1330 1331static int 1332sanitize_partition(struct dos_partition *partp) 1333{ 1334 u_int32_t prev_head_boundary, prev_cyl_boundary; 1335 u_int32_t max_end, size, start; 1336 1337 start = partp->dp_start; 1338 size = partp->dp_size; 1339 max_end = start + size; 1340 /* Only allow a zero size if the partition is being marked unused. */ 1341 if (size == 0) { 1342 if (start == 0 && partp->dp_typ == 0) 1343 return (1); 1344 warnx("ERROR: size of partition is zero"); 1345 return (0); 1346 } 1347 /* Return if no adjustment is necessary. */ 1348 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1349 return (1); 1350 1351 if (start == 0) { 1352 warnx("WARNING: partition overlaps with partition table"); 1353 if (ok("Correct this automatically?")) 1354 start = dos_sectors; 1355 } 1356 if (start % dos_sectors != 0) 1357 warnx("WARNING: partition does not start on a head boundary"); 1358 if ((start +size) % dos_sectors != 0) 1359 warnx("WARNING: partition does not end on a cylinder boundary"); 1360 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1361 if (!ok("Correct this automatically?")) 1362 return (1); 1363 1364 /* 1365 * Adjust start upwards, if necessary, to fall on a head boundary. 1366 */ 1367 if (start % dos_sectors != 0) { 1368 prev_head_boundary = start / dos_sectors * dos_sectors; 1369 if (max_end < dos_sectors || 1370 prev_head_boundary >= max_end - dos_sectors) { 1371 /* 1372 * Can't go past end of partition 1373 */ 1374 warnx( 1375 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1376 return (0); 1377 } 1378 start = prev_head_boundary + dos_sectors; 1379 } 1380 1381 /* 1382 * Adjust size downwards, if necessary, to fall on a cylinder 1383 * boundary. 1384 */ 1385 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1386 if (prev_cyl_boundary > start) 1387 size = prev_cyl_boundary - start; 1388 else { 1389 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1390 and end on a cylinder boundary."); 1391 return (0); 1392 } 1393 1394 /* Finally, commit any changes to partp and return. */ 1395 if (start != partp->dp_start) { 1396 warnx("WARNING: adjusting start offset of partition to %u", 1397 (u_int)start); 1398 partp->dp_start = start; 1399 } 1400 if (size != partp->dp_size) { 1401 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1402 partp->dp_size = size; 1403 } 1404 1405 return (1); 1406} 1407 1408/* 1409 * Try figuring out the root device's canonical disk name. 1410 * The following choices are considered: 1411 * /dev/ad0s1a => /dev/ad0 1412 * /dev/da0a => /dev/da0 1413 * /dev/vinum/root => /dev/vinum/root 1414 */ 1415static char * 1416get_rootdisk(void) 1417{ 1418 struct statfs rootfs; 1419 regex_t re; 1420#define NMATCHES 2 1421 regmatch_t rm[NMATCHES]; 1422 char *s; 1423 int rv; 1424 1425 if (statfs("/", &rootfs) == -1) 1426 err(1, "statfs(\"/\")"); 1427 1428 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$", 1429 REG_EXTENDED)) != 0) 1430 errx(1, "regcomp() failed (%d)", rv); 1431 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1432 errx(1, 1433"mounted root fs resource doesn't match expectations (regexec returned %d)", 1434 rv); 1435 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1436 errx(1, "out of memory"); 1437 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1438 rm[1].rm_eo - rm[1].rm_so); 1439 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1440 1441 return s; 1442} 1443