fdisk.c revision 93394
1/* 2 * Mach Operating System 3 * Copyright (c) 1992 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 27#ifndef lint 28static const char rcsid[] = 29 "$FreeBSD: head/sbin/fdisk/fdisk.c 93394 2002-03-29 19:33:14Z phk $"; 30#endif /* not lint */ 31 32#include <sys/disklabel.h> 33#include <sys/param.h> 34#include <sys/stat.h> 35#include <sys/mount.h> 36#include <ctype.h> 37#include <fcntl.h> 38#include <err.h> 39#include <errno.h> 40#include <paths.h> 41#include <regex.h> 42#include <stdio.h> 43#include <stdlib.h> 44#include <string.h> 45#include <unistd.h> 46 47int iotest; 48 49#define LBUF 100 50static char lbuf[LBUF]; 51 52#define MBRSIGOFF 510 53 54/* 55 * 56 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 57 * 58 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 59 * Copyright (c) 1989 Robert. V. Baron 60 * Created. 61 */ 62 63#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 64 65#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 66 67#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 68#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 69static int secsize = 0; /* the sensed sector size */ 70 71static char *disk; 72 73static struct disklabel disklabel; /* disk parameters */ 74 75static int cyls, sectors, heads, cylsecs, disksecs; 76 77struct mboot { 78 unsigned char padding[2]; /* force the longs to be long aligned */ 79 unsigned char *bootinst; /* boot code */ 80 off_t bootinst_size; 81 struct dos_partition parts[4]; 82}; 83 84static struct mboot mboot; 85static int fd; 86 87#define ACTIVE 0x80 88#define BOOT_MAGIC 0xAA55 89 90static uint dos_cyls; 91static uint dos_heads; 92static uint dos_sectors; 93static uint dos_cylsecs; 94 95#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 96#define DOSCYL(c) (c & 0xff) 97 98#define MAX_ARGS 10 99 100static int current_line_number; 101 102static int geom_processed = 0; 103static int part_processed = 0; 104static int active_processed = 0; 105 106typedef struct cmd { 107 char cmd; 108 int n_args; 109 struct arg { 110 char argtype; 111 int arg_val; 112 } args[MAX_ARGS]; 113} CMD; 114 115static int B_flag = 0; /* replace boot code */ 116static int I_flag = 0; /* use entire disk for FreeBSD */ 117static int a_flag = 0; /* set active partition */ 118static char *b_flag = NULL; /* path to boot code */ 119static int i_flag = 0; /* replace partition data */ 120static int u_flag = 0; /* update partition data */ 121static int s_flag = 0; /* Print a summary and exit */ 122static int t_flag = 0; /* test only, if f_flag is given */ 123static char *f_flag = NULL; /* Read config info from file */ 124static int v_flag = 0; /* Be verbose */ 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 / filesystem"} 134 ,{0x03, "XENIX /usr filesystem"} 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 filesystem 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 filesystem"} 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 ,{0xB7, "BSDI BSD/386 filesystem"} 197 ,{0xB8, "BSDI BSD/386 swap"} 198 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 199 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 200 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 201 ,{0xC7, "Syrinx"} 202 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 203 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 204 ,{0xE3, "DOS R/O or SpeedStor"} 205 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 206 ,{0xEB, "BeOS filesystem"} 207 ,{0xEE, "EFI GPT"} 208 ,{0xEF, "EFI System Partition"} 209 ,{0xF1, "SpeedStor"} 210 ,{0xF2, "DOS 3.3+ Secondary"} 211 ,{0xF4, "SpeedStor large partition"} 212 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 213 ,{0xFF, "Xenix bad blocks table"} 214}; 215 216static void print_s0(int which); 217static void print_part(int i); 218static void init_sector0(unsigned long start); 219static void init_boot(void); 220static void change_part(int i); 221static void print_params(void); 222static void change_active(int which); 223static void change_code(void); 224static void get_params_to_use(void); 225static char *get_rootdisk(void); 226static void dos(struct dos_partition *partp); 227static int open_disk(int flag); 228static ssize_t read_disk(off_t sector, void *buf); 229static ssize_t write_disk(off_t sector, void *buf); 230static int get_params(void); 231static int read_s0(void); 232static int write_s0(void); 233static int ok(const char *str); 234static int decimal(const char *str, int *num, int deflt); 235static const char *get_type(int type); 236static int read_config(char *config_file); 237static void reset_boot(void); 238static int sanitize_partition(struct dos_partition *); 239static void usage(void); 240 241int 242main(int argc, char *argv[]) 243{ 244 struct stat sb; 245 int c, i; 246 int partition = -1; 247 struct dos_partition *partp; 248 249 while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1) 250 switch (c) { 251 case 'B': 252 B_flag = 1; 253 break; 254 case 'I': 255 I_flag = 1; 256 break; 257 case 'a': 258 a_flag = 1; 259 break; 260 case 'b': 261 b_flag = optarg; 262 break; 263 case 'f': 264 f_flag = optarg; 265 break; 266 case 'i': 267 i_flag = 1; 268 break; 269 case 's': 270 s_flag = 1; 271 break; 272 case 't': 273 t_flag = 1; 274 break; 275 case 'u': 276 u_flag = 1; 277 break; 278 case 'v': 279 v_flag = 1; 280 break; 281 case '1': 282 case '2': 283 case '3': 284 case '4': 285 partition = c - '0'; 286 break; 287 default: 288 usage(); 289 } 290 if (f_flag || i_flag) 291 u_flag = 1; 292 if (t_flag) 293 v_flag = 1; 294 argc -= optind; 295 argv += optind; 296 297 if (argc == 0) { 298 disk = get_rootdisk(); 299 } else { 300 if (stat(argv[0], &sb) == 0) { 301 /* OK, full pathname given */ 302 disk = argv[0]; 303 } else if (errno == ENOENT) { 304 /* Try prepending "/dev" */ 305 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 306 if (disk == NULL) 307 errx(1, "out of memory"); 308 } else { 309 /* other stat error, let it fail below */ 310 disk = argv[0]; 311 } 312 } 313 if (open_disk(u_flag) < 0) 314 err(1, "cannot open disk %s", disk); 315 316 /* (abu)use mboot.bootinst to probe for the sector size */ 317 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 318 err(1, "cannot allocate buffer to determine disk sector size"); 319 read_disk(0, mboot.bootinst); 320 free(mboot.bootinst); 321 mboot.bootinst = NULL; 322 323 if (s_flag) { 324 if (read_s0()) 325 err(1, "read_s0"); 326 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 327 dos_sectors); 328 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 329 for (i = 0; i < NDOSPART; i++) { 330 partp = ((struct dos_partition *) &mboot.parts) + i; 331 if (partp->dp_start == 0 && partp->dp_size == 0) 332 continue; 333 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 334 (u_long) partp->dp_start, 335 (u_long) partp->dp_size, partp->dp_typ, 336 partp->dp_flag); 337 } 338 exit(0); 339 } 340 341 printf("******* Working on device %s *******\n",disk); 342 343 if (I_flag) { 344 read_s0(); 345 reset_boot(); 346 partp = (struct dos_partition *) (&mboot.parts[0]); 347 partp->dp_typ = DOSPTYP_386BSD; 348 partp->dp_flag = ACTIVE; 349 partp->dp_start = dos_sectors; 350 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 351 dos_sectors; 352 353 dos(partp); 354 if (v_flag) 355 print_s0(-1); 356 write_s0(); 357 exit(0); 358 } 359 if (f_flag) { 360 if (read_s0() || i_flag) 361 reset_boot(); 362 if (!read_config(f_flag)) 363 exit(1); 364 if (v_flag) 365 print_s0(-1); 366 if (!t_flag) 367 write_s0(); 368 } else { 369 if(u_flag) 370 get_params_to_use(); 371 else 372 print_params(); 373 374 if (read_s0()) 375 init_sector0(dos_sectors); 376 377 printf("Media sector size is %d\n", secsize); 378 printf("Warning: BIOS sector numbering starts with sector 1\n"); 379 printf("Information from DOS bootblock is:\n"); 380 if (partition == -1) 381 for (i = 1; i <= NDOSPART; i++) 382 change_part(i); 383 else 384 change_part(partition); 385 386 if (u_flag || a_flag) 387 change_active(partition); 388 389 if (B_flag) 390 change_code(); 391 392 if (u_flag || a_flag || B_flag) { 393 if (!t_flag) { 394 printf("\nWe haven't changed the partition table yet. "); 395 printf("This is your last chance.\n"); 396 } 397 print_s0(-1); 398 if (!t_flag) { 399 if (ok("Should we write new partition table?")) 400 write_s0(); 401 } else { 402 printf("\n-t flag specified -- partition table not written.\n"); 403 } 404 } 405 } 406 407 exit(0); 408} 409 410static void 411usage() 412{ 413 fprintf(stderr, "%s%s", 414 "usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n", 415 " fdisk -f configfile [-itv] [disk]\n"); 416 exit(1); 417} 418 419static void 420print_s0(int which) 421{ 422 int i; 423 424 print_params(); 425 printf("Information from DOS bootblock is:\n"); 426 if (which == -1) 427 for (i = 1; i <= NDOSPART; i++) 428 printf("%d: ", i), print_part(i); 429 else 430 print_part(which); 431} 432 433static struct dos_partition mtpart; 434 435static void 436print_part(int i) 437{ 438 struct dos_partition *partp; 439 u_int64_t part_mb; 440 441 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 442 443 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 444 printf("<UNUSED>\n"); 445 return; 446 } 447 /* 448 * Be careful not to overflow. 449 */ 450 part_mb = partp->dp_size; 451 part_mb *= secsize; 452 part_mb /= (1024 * 1024); 453 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 454 get_type(partp->dp_typ)); 455 printf(" start %lu, size %lu (%qd Meg), flag %x%s\n", 456 (u_long)partp->dp_start, 457 (u_long)partp->dp_size, 458 part_mb, 459 partp->dp_flag, 460 partp->dp_flag == ACTIVE ? " (active)" : ""); 461 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 462 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 463 ,partp->dp_shd 464 ,DPSECT(partp->dp_ssect) 465 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 466 ,partp->dp_ehd 467 ,DPSECT(partp->dp_esect)); 468} 469 470 471static void 472init_boot(void) 473{ 474 const char *fname; 475 int fdesc, n; 476 struct stat sb; 477 478 fname = b_flag ? b_flag : "/boot/mbr"; 479 if ((fdesc = open(fname, O_RDONLY)) == -1 || 480 fstat(fdesc, &sb) == -1) 481 err(1, "%s", fname); 482 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 483 errx(1, "%s: length must be a multiple of sector size", fname); 484 if (mboot.bootinst != NULL) 485 free(mboot.bootinst); 486 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 487 errx(1, "%s: unable to allocate read buffer", fname); 488 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 489 close(fdesc)) 490 err(1, "%s", fname); 491 if (n != mboot.bootinst_size) 492 errx(1, "%s: short read", fname); 493} 494 495 496static void 497init_sector0(unsigned long start) 498{ 499 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]); 500 501 init_boot(); 502 503 partp->dp_typ = DOSPTYP_386BSD; 504 partp->dp_flag = ACTIVE; 505 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 506 if(start == 0) 507 start = dos_sectors; 508 partp->dp_start = start; 509 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 510 511 dos(partp); 512} 513 514static void 515change_part(int i) 516{ 517 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 518 519 printf("The data for partition %d is:\n", i); 520 print_part(i); 521 522 if (u_flag && ok("Do you want to change it?")) { 523 int tmp; 524 525 if (i_flag) { 526 bzero((char *)partp, sizeof (struct dos_partition)); 527 if (i == 4) { 528 init_sector0(1); 529 printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n"); 530 print_part(i); 531 } 532 } 533 534 do { 535 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 536 Decimal("start", partp->dp_start, tmp); 537 Decimal("size", partp->dp_size, tmp); 538 if (!sanitize_partition(partp)) { 539 warnx("ERROR: failed to adjust; setting sysid to 0"); 540 partp->dp_typ = 0; 541 } 542 543 if (ok("Explicitly specify beg/end address ?")) 544 { 545 int tsec,tcyl,thd; 546 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 547 thd = partp->dp_shd; 548 tsec = DPSECT(partp->dp_ssect); 549 Decimal("beginning cylinder", tcyl, tmp); 550 Decimal("beginning head", thd, tmp); 551 Decimal("beginning sector", tsec, tmp); 552 partp->dp_scyl = DOSCYL(tcyl); 553 partp->dp_ssect = DOSSECT(tsec,tcyl); 554 partp->dp_shd = thd; 555 556 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 557 thd = partp->dp_ehd; 558 tsec = DPSECT(partp->dp_esect); 559 Decimal("ending cylinder", tcyl, tmp); 560 Decimal("ending head", thd, tmp); 561 Decimal("ending sector", tsec, tmp); 562 partp->dp_ecyl = DOSCYL(tcyl); 563 partp->dp_esect = DOSSECT(tsec,tcyl); 564 partp->dp_ehd = thd; 565 } else 566 dos(partp); 567 568 print_part(i); 569 } while (!ok("Are we happy with this entry?")); 570 } 571 } 572 573static void 574print_params() 575{ 576 printf("parameters extracted from in-core disklabel are:\n"); 577 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 578 ,cyls,heads,sectors,cylsecs); 579 if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255)) 580 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 581 printf("parameters to be used for BIOS calculations are:\n"); 582 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 583 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 584} 585 586static void 587change_active(int which) 588{ 589 struct dos_partition *partp = &mboot.parts[0]; 590 int active, i, new, tmp; 591 592 active = -1; 593 for (i = 0; i < NDOSPART; i++) { 594 if ((partp[i].dp_flag & ACTIVE) == 0) 595 continue; 596 printf("Partition %d is marked active\n", i + 1); 597 if (active == -1) 598 active = i + 1; 599 } 600 if (a_flag && which != -1) 601 active = which; 602 else if (active == -1) 603 active = 1; 604 605 if (!ok("Do you want to change the active partition?")) 606 return; 607setactive: 608 do { 609 new = active; 610 Decimal("active partition", new, tmp); 611 if (new < 1 || new > 4) { 612 printf("Active partition number must be in range 1-4." 613 " Try again.\n"); 614 goto setactive; 615 } 616 active = new; 617 } while (!ok("Are you happy with this choice")); 618 for (i = 0; i < NDOSPART; i++) 619 partp[i].dp_flag = 0; 620 if (active > 0 && active <= NDOSPART) 621 partp[active-1].dp_flag = ACTIVE; 622} 623 624static void 625change_code() 626{ 627 if (ok("Do you want to change the boot code?")) 628 init_boot(); 629} 630 631void 632get_params_to_use() 633{ 634 int tmp; 635 print_params(); 636 if (ok("Do you want to change our idea of what BIOS thinks ?")) 637 { 638 do 639 { 640 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 641 Decimal("BIOS's idea of #heads", dos_heads, tmp); 642 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 643 dos_cylsecs = dos_heads * dos_sectors; 644 print_params(); 645 } 646 while(!ok("Are you happy with this choice")); 647 } 648} 649 650 651/***********************************************\ 652* Change real numbers into strange dos numbers * 653\***********************************************/ 654static void 655dos(struct dos_partition *partp) 656{ 657 int cy, sec; 658 u_int32_t end; 659 660 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 661 memcpy(partp, &mtpart, sizeof(*partp)); 662 return; 663 } 664 665 /* Start c/h/s. */ 666 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 667 cy = partp->dp_start / dos_cylsecs; 668 sec = partp->dp_start % dos_sectors + 1; 669 partp->dp_scyl = DOSCYL(cy); 670 partp->dp_ssect = DOSSECT(sec, cy); 671 672 /* End c/h/s. */ 673 end = partp->dp_start + partp->dp_size - 1; 674 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 675 cy = end / dos_cylsecs; 676 sec = end % dos_sectors + 1; 677 partp->dp_ecyl = DOSCYL(cy); 678 partp->dp_esect = DOSSECT(sec, cy); 679} 680 681static int 682open_disk(int flag) 683{ 684 struct stat st; 685 686 if (stat(disk, &st) == -1) { 687 if (errno == ENOENT) 688 return -2; 689 warnx("can't get file status of %s", disk); 690 return -1; 691 } 692 if ( !(st.st_mode & S_IFCHR) ) 693 warnx("device %s is not character special", disk); 694 if ((fd = open(disk, 695 a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY)) == -1) { 696 if(errno == ENXIO) 697 return -2; 698 warnx("can't open device %s", disk); 699 return -1; 700 } 701 if (get_params() == -1) { 702 warnx("can't get disk parameters on %s", disk); 703 return -1; 704 } 705 return fd; 706} 707 708static ssize_t 709read_disk(off_t sector, void *buf) 710{ 711 lseek(fd,(sector * 512), 0); 712 if( secsize == 0 ) 713 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 714 { 715 /* try the read */ 716 int size = read(fd, buf, secsize); 717 if( size == secsize ) 718 /* it worked so return */ 719 return secsize; 720 } 721 else 722 return read( fd, buf, secsize ); 723 724 /* we failed to read at any of the sizes */ 725 return -1; 726} 727 728static ssize_t 729write_disk(off_t sector, void *buf) 730{ 731 lseek(fd,(sector * 512), 0); 732 /* write out in the size that the read_disk found worked */ 733 return write(fd, buf, secsize); 734} 735 736static int 737get_params() 738{ 739 740 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 741 warnx("can't get disk parameters on %s; supplying dummy ones", disk); 742 dos_cyls = cyls = 1; 743 dos_heads = heads = 1; 744 dos_sectors = sectors = 1; 745 dos_cylsecs = cylsecs = heads * sectors; 746 disksecs = cyls * heads * sectors; 747 return disksecs; 748 } 749 750 dos_cyls = cyls = disklabel.d_ncylinders; 751 dos_heads = heads = disklabel.d_ntracks; 752 dos_sectors = sectors = disklabel.d_nsectors; 753 dos_cylsecs = cylsecs = heads * sectors; 754 disksecs = cyls * heads * sectors; 755 756 return (disksecs); 757} 758 759 760static int 761read_s0() 762{ 763 mboot.bootinst_size = secsize; 764 if (mboot.bootinst != NULL) 765 free(mboot.bootinst); 766 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 767 warnx("unable to allocate buffer to read fdisk " 768 "partition table"); 769 return -1; 770 } 771 if (read_disk(0, mboot.bootinst) == -1) { 772 warnx("can't read fdisk partition table"); 773 return -1; 774 } 775 if (*(uint16_t *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 776 warnx("invalid fdisk partition table found"); 777 /* So should we initialize things */ 778 return -1; 779 } 780 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 781 return 0; 782} 783 784static int 785write_s0() 786{ 787 int sector; 788 789 if (iotest) { 790 print_s0(-1); 791 return 0; 792 } 793 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 794 /* 795 * write enable label sector before write (if necessary), 796 * disable after writing. 797 * needed if the disklabel protected area also protects 798 * sector 0. (e.g. empty disk) 799 */ 800 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 801 if (write_disk(sector, 802 &mboot.bootinst[sector * secsize]) == -1) { 803 warn("can't write fdisk partition table"); 804 return -1; 805 } 806 return(0); 807} 808 809 810static int 811ok(const char *str) 812{ 813 printf("%s [n] ", str); 814 fflush(stdout); 815 if (fgets(lbuf, LBUF, stdin) == NULL) 816 exit(1); 817 lbuf[strlen(lbuf)-1] = 0; 818 819 if (*lbuf && 820 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 821 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 822 return 1; 823 else 824 return 0; 825} 826 827static int 828decimal(const char *str, int *num, int deflt) 829{ 830 int acc = 0, c; 831 char *cp; 832 833 while (1) { 834 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 835 fflush(stdout); 836 if (fgets(lbuf, LBUF, stdin) == NULL) 837 exit(1); 838 lbuf[strlen(lbuf)-1] = 0; 839 840 if (!*lbuf) 841 return 0; 842 843 cp = lbuf; 844 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 845 if (!c) 846 return 0; 847 while ((c = *cp++)) { 848 if (c <= '9' && c >= '0') 849 acc = acc * 10 + c - '0'; 850 else 851 break; 852 } 853 if (c == ' ' || c == '\t') 854 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 855 if (!c) { 856 *num = acc; 857 return 1; 858 } else 859 printf("%s is an invalid decimal number. Try again.\n", 860 lbuf); 861 } 862 863} 864 865static const char * 866get_type(int type) 867{ 868 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 869 int counter = 0; 870 struct part_type *ptr = part_types; 871 872 873 while(counter < numentries) { 874 if(ptr->type == type) 875 return(ptr->name); 876 ptr++; 877 counter++; 878 } 879 return("unknown"); 880} 881 882 883static void 884parse_config_line(char *line, CMD *command) 885{ 886 char *cp, *end; 887 888 cp = line; 889 while (1) { 890 memset(command, 0, sizeof(*command)); 891 892 while (isspace(*cp)) ++cp; 893 if (*cp == '\0' || *cp == '#') 894 break; 895 command->cmd = *cp++; 896 897 /* 898 * Parse args 899 */ 900 while (1) { 901 while (isspace(*cp)) ++cp; 902 if (*cp == '#') 903 break; /* found comment */ 904 if (isalpha(*cp)) 905 command->args[command->n_args].argtype = *cp++; 906 if (!isdigit(*cp)) 907 break; /* assume end of line */ 908 end = NULL; 909 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 910 if (cp == end) 911 break; /* couldn't parse number */ 912 cp = end; 913 command->n_args++; 914 } 915 break; 916 } 917} 918 919 920static int 921process_geometry(CMD *command) 922{ 923 int status = 1, i; 924 925 while (1) { 926 geom_processed = 1; 927 if (part_processed) { 928 warnx( 929 "ERROR line %d: the geometry specification line must occur before\n\ 930 all partition specifications", 931 current_line_number); 932 status = 0; 933 break; 934 } 935 if (command->n_args != 3) { 936 warnx("ERROR line %d: incorrect number of geometry args", 937 current_line_number); 938 status = 0; 939 break; 940 } 941 dos_cyls = 0; 942 dos_heads = 0; 943 dos_sectors = 0; 944 for (i = 0; i < 3; ++i) { 945 switch (command->args[i].argtype) { 946 case 'c': 947 dos_cyls = command->args[i].arg_val; 948 break; 949 case 'h': 950 dos_heads = command->args[i].arg_val; 951 break; 952 case 's': 953 dos_sectors = command->args[i].arg_val; 954 break; 955 default: 956 warnx( 957 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 958 current_line_number, command->args[i].argtype, 959 command->args[i].argtype); 960 status = 0; 961 break; 962 } 963 } 964 if (status == 0) 965 break; 966 967 dos_cylsecs = dos_heads * dos_sectors; 968 969 /* 970 * Do sanity checks on parameter values 971 */ 972 if (dos_cyls == 0) { 973 warnx("ERROR line %d: number of cylinders not specified", 974 current_line_number); 975 status = 0; 976 } 977 if (dos_cyls > 1024) { 978 warnx( 979 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 980 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 981 is dedicated to FreeBSD)", 982 current_line_number, dos_cyls); 983 } 984 985 if (dos_heads == 0) { 986 warnx("ERROR line %d: number of heads not specified", 987 current_line_number); 988 status = 0; 989 } else if (dos_heads > 256) { 990 warnx("ERROR line %d: number of heads must be within (1-256)", 991 current_line_number); 992 status = 0; 993 } 994 995 if (dos_sectors == 0) { 996 warnx("ERROR line %d: number of sectors not specified", 997 current_line_number); 998 status = 0; 999 } else if (dos_sectors > 63) { 1000 warnx("ERROR line %d: number of sectors must be within (1-63)", 1001 current_line_number); 1002 status = 0; 1003 } 1004 1005 break; 1006 } 1007 return (status); 1008} 1009 1010 1011static int 1012process_partition(CMD *command) 1013{ 1014 int status = 0, partition; 1015 u_int32_t prev_head_boundary, prev_cyl_boundary; 1016 u_int32_t adj_size, max_end; 1017 struct dos_partition *partp; 1018 1019 while (1) { 1020 part_processed = 1; 1021 if (command->n_args != 4) { 1022 warnx("ERROR line %d: incorrect number of partition args", 1023 current_line_number); 1024 break; 1025 } 1026 partition = command->args[0].arg_val; 1027 if (partition < 1 || partition > 4) { 1028 warnx("ERROR line %d: invalid partition number %d", 1029 current_line_number, partition); 1030 break; 1031 } 1032 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1033 bzero((char *)partp, sizeof (struct dos_partition)); 1034 partp->dp_typ = command->args[1].arg_val; 1035 partp->dp_start = command->args[2].arg_val; 1036 partp->dp_size = command->args[3].arg_val; 1037 max_end = partp->dp_start + partp->dp_size; 1038 1039 if (partp->dp_typ == 0) { 1040 /* 1041 * Get out, the partition is marked as unused. 1042 */ 1043 /* 1044 * Insure that it's unused. 1045 */ 1046 bzero((char *)partp, sizeof (struct dos_partition)); 1047 status = 1; 1048 break; 1049 } 1050 1051 /* 1052 * Adjust start upwards, if necessary, to fall on an head boundary. 1053 */ 1054 if (partp->dp_start % dos_sectors != 0) { 1055 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1056 if (max_end < dos_sectors || 1057 prev_head_boundary > max_end - dos_sectors) { 1058 /* 1059 * Can't go past end of partition 1060 */ 1061 warnx( 1062 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1063 a head boundary", 1064 current_line_number, partition); 1065 break; 1066 } 1067 warnx( 1068 "WARNING: adjusting start offset of partition %d\n\ 1069 from %u to %u, to fall on a head boundary", 1070 partition, (u_int)partp->dp_start, 1071 (u_int)(prev_head_boundary + dos_sectors)); 1072 partp->dp_start = prev_head_boundary + dos_sectors; 1073 } 1074 1075 /* 1076 * Adjust size downwards, if necessary, to fall on a cylinder 1077 * boundary. 1078 */ 1079 prev_cyl_boundary = 1080 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1081 if (prev_cyl_boundary > partp->dp_start) 1082 adj_size = prev_cyl_boundary - partp->dp_start; 1083 else { 1084 warnx( 1085 "ERROR: could not adjust partition to start on a head boundary\n\ 1086 and end on a cylinder boundary."); 1087 return (0); 1088 } 1089 if (adj_size != partp->dp_size) { 1090 warnx( 1091 "WARNING: adjusting size of partition %d from %u to %u\n\ 1092 to end on a cylinder boundary", 1093 partition, (u_int)partp->dp_size, (u_int)adj_size); 1094 partp->dp_size = adj_size; 1095 } 1096 if (partp->dp_size == 0) { 1097 warnx("ERROR line %d: size of partition %d is zero", 1098 current_line_number, partition); 1099 break; 1100 } 1101 1102 dos(partp); 1103 status = 1; 1104 break; 1105 } 1106 return (status); 1107} 1108 1109 1110static int 1111process_active(CMD *command) 1112{ 1113 int status = 0, partition, i; 1114 struct dos_partition *partp; 1115 1116 while (1) { 1117 active_processed = 1; 1118 if (command->n_args != 1) { 1119 warnx("ERROR line %d: incorrect number of active args", 1120 current_line_number); 1121 status = 0; 1122 break; 1123 } 1124 partition = command->args[0].arg_val; 1125 if (partition < 1 || partition > 4) { 1126 warnx("ERROR line %d: invalid partition number %d", 1127 current_line_number, partition); 1128 break; 1129 } 1130 /* 1131 * Reset active partition 1132 */ 1133 partp = ((struct dos_partition *) &mboot.parts); 1134 for (i = 0; i < NDOSPART; i++) 1135 partp[i].dp_flag = 0; 1136 partp[partition-1].dp_flag = ACTIVE; 1137 1138 status = 1; 1139 break; 1140 } 1141 return (status); 1142} 1143 1144 1145static int 1146process_line(char *line) 1147{ 1148 CMD command; 1149 int status = 1; 1150 1151 while (1) { 1152 parse_config_line(line, &command); 1153 switch (command.cmd) { 1154 case 0: 1155 /* 1156 * Comment or blank line 1157 */ 1158 break; 1159 case 'g': 1160 /* 1161 * Set geometry 1162 */ 1163 status = process_geometry(&command); 1164 break; 1165 case 'p': 1166 status = process_partition(&command); 1167 break; 1168 case 'a': 1169 status = process_active(&command); 1170 break; 1171 default: 1172 status = 0; 1173 break; 1174 } 1175 break; 1176 } 1177 return (status); 1178} 1179 1180 1181static int 1182read_config(char *config_file) 1183{ 1184 FILE *fp = NULL; 1185 int status = 1; 1186 char buf[1010]; 1187 1188 while (1) { 1189 if (strcmp(config_file, "-") != 0) { 1190 /* 1191 * We're not reading from stdin 1192 */ 1193 if ((fp = fopen(config_file, "r")) == NULL) { 1194 status = 0; 1195 break; 1196 } 1197 } else { 1198 fp = stdin; 1199 } 1200 current_line_number = 0; 1201 while (!feof(fp)) { 1202 if (fgets(buf, sizeof(buf), fp) == NULL) 1203 break; 1204 ++current_line_number; 1205 status = process_line(buf); 1206 if (status == 0) 1207 break; 1208 } 1209 break; 1210 } 1211 if (fp) { 1212 /* 1213 * It doesn't matter if we're reading from stdin, as we've reached EOF 1214 */ 1215 fclose(fp); 1216 } 1217 return (status); 1218} 1219 1220 1221static void 1222reset_boot(void) 1223{ 1224 int i; 1225 struct dos_partition *partp; 1226 1227 init_boot(); 1228 for (i = 0; i < 4; ++i) { 1229 partp = ((struct dos_partition *) &mboot.parts) + i; 1230 bzero((char *)partp, sizeof (struct dos_partition)); 1231 } 1232} 1233 1234static int 1235sanitize_partition(struct dos_partition *partp) 1236{ 1237 u_int32_t prev_head_boundary, prev_cyl_boundary; 1238 u_int32_t max_end, size, start; 1239 1240 start = partp->dp_start; 1241 size = partp->dp_size; 1242 max_end = start + size; 1243 /* Only allow a zero size if the partition is being marked unused. */ 1244 if (size == 0) { 1245 if (start == 0 && partp->dp_typ == 0) 1246 return (1); 1247 warnx("ERROR: size of partition is zero"); 1248 return (0); 1249 } 1250 /* Return if no adjustment is necessary. */ 1251 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1252 return (1); 1253 1254 if (start % dos_sectors != 0) 1255 warnx("WARNING: partition does not start on a head boundary"); 1256 if ((start +size) % dos_sectors != 0) 1257 warnx("WARNING: partition does not end on a cylinder boundary"); 1258 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1259 if (!ok("Correct this automatically?")) 1260 return (1); 1261 1262 /* 1263 * Adjust start upwards, if necessary, to fall on an head boundary. 1264 */ 1265 if (start % dos_sectors != 0) { 1266 prev_head_boundary = start / dos_sectors * dos_sectors; 1267 if (max_end < dos_sectors || 1268 prev_head_boundary >= max_end - dos_sectors) { 1269 /* 1270 * Can't go past end of partition 1271 */ 1272 warnx( 1273 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1274 return (0); 1275 } 1276 start = prev_head_boundary + dos_sectors; 1277 } 1278 1279 /* 1280 * Adjust size downwards, if necessary, to fall on a cylinder 1281 * boundary. 1282 */ 1283 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1284 if (prev_cyl_boundary > start) 1285 size = prev_cyl_boundary - start; 1286 else { 1287 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1288 and end on a cylinder boundary."); 1289 return (0); 1290 } 1291 1292 /* Finally, commit any changes to partp and return. */ 1293 if (start != partp->dp_start) { 1294 warnx("WARNING: adjusting start offset of partition to %u", 1295 (u_int)start); 1296 partp->dp_start = start; 1297 } 1298 if (size != partp->dp_size) { 1299 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1300 partp->dp_size = size; 1301 } 1302 1303 return (1); 1304} 1305 1306/* 1307 * Try figuring out the root device's canonical disk name. 1308 * The following choices are considered: 1309 * /dev/ad0s1a => /dev/ad0 1310 * /dev/da0a => /dev/da0 1311 * /dev/vinum/root => /dev/vinum/root 1312 */ 1313static char * 1314get_rootdisk(void) 1315{ 1316 struct statfs rootfs; 1317 regex_t re; 1318#define NMATCHES 2 1319 regmatch_t rm[NMATCHES]; 1320 char *s; 1321 int rv; 1322 1323 if (statfs("/", &rootfs) == -1) 1324 err(1, "statfs(\"/\")"); 1325 1326 if ((rv = regcomp(&re, "^(/dev/.*)(\\d+(s\\d+)?[a-h])?$", 1327 REG_EXTENDED)) != 0) 1328 errx(1, "regcomp() failed (%d)", rv); 1329 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1330 errx(1, 1331"mounted root fs resource doesn't match expectations (regexec returned %d)", 1332 rv); 1333 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1334 errx(1, "out of memory"); 1335 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1336 rm[1].rm_eo - rm[1].rm_so); 1337 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1338 1339 return s; 1340} 1341