fdisk.c revision 79681
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 79681 2001-07-13 16:48:56Z joerg $"; 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#define Hex(str, ans, tmp) if (hex(str, &tmp, ans)) ans = tmp 65#define String(str, ans, len) {char *z = ans; char **dflt = &z; if (string(str, dflt)) strncpy(ans, *dflt, len); } 66 67#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 68 69#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 70#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 71int secsize = 0; /* the sensed sector size */ 72 73char *disk; 74 75struct disklabel disklabel; /* disk parameters */ 76 77int cyls, sectors, heads, cylsecs, disksecs; 78 79struct mboot 80{ 81 unsigned char padding[2]; /* force the longs to be long aligned */ 82 unsigned char *bootinst; /* boot code */ 83 off_t bootinst_size; 84 struct dos_partition parts[4]; 85}; 86struct mboot mboot = {{0}, NULL, 0}; 87 88#define ACTIVE 0x80 89#define BOOT_MAGIC 0xAA55 90 91int dos_cyls; 92int dos_heads; 93int dos_sectors; 94int dos_cylsecs; 95 96#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 97#define DOSCYL(c) (c & 0xff) 98static int partition = -1; 99 100 101#define MAX_ARGS 10 102 103static int current_line_number; 104 105static int geom_processed = 0; 106static int part_processed = 0; 107static int active_processed = 0; 108 109 110typedef struct cmd { 111 char cmd; 112 int n_args; 113 struct arg { 114 char argtype; 115 int arg_val; 116 } args[MAX_ARGS]; 117} CMD; 118 119 120static int B_flag = 0; /* replace boot code */ 121static int I_flag = 0; /* use entire disk for FreeBSD */ 122static int a_flag = 0; /* set active partition */ 123static char *b_flag = NULL; /* path to boot code */ 124static int i_flag = 0; /* replace partition data */ 125static int u_flag = 0; /* update partition data */ 126static int s_flag = 0; /* Print a summary and exit */ 127static int t_flag = 0; /* test only, if f_flag is given */ 128static char *f_flag = NULL; /* Read config info from file */ 129static int v_flag = 0; /* Be verbose */ 130 131struct part_type 132{ 133 unsigned char type; 134 char *name; 135}part_types[] = 136{ 137 {0x00, "unused"} 138 ,{0x01, "Primary DOS with 12 bit FAT"} 139 ,{0x02, "XENIX / filesystem"} 140 ,{0x03, "XENIX /usr filesystem"} 141 ,{0x04, "Primary DOS with 16 bit FAT (<= 32MB)"} 142 ,{0x05, "Extended DOS"} 143 ,{0x06, "Primary 'big' DOS (> 32MB)"} 144 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 145 ,{0x08, "AIX filesystem"} 146 ,{0x09, "AIX boot partition or Coherent"} 147 ,{0x0A, "OS/2 Boot Manager or OPUS"} 148 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 149 ,{0x0C, "DOS or Windows 95 with 32 bit FAT, LBA"} 150 ,{0x0E, "Primary 'big' DOS (> 32MB, LBA)"} 151 ,{0x0F, "Extended DOS, LBA"} 152 ,{0x10, "OPUS"} 153 ,{0x39, "plan9"} 154 ,{0x40, "VENIX 286"} 155 ,{0x4D, "QNX 4.2 Primary"} 156 ,{0x4E, "QNX 4.2 Secondary"} 157 ,{0x4F, "QNX 4.2 Tertiary"} 158 ,{0x50, "DM"} 159 ,{0x51, "DM"} 160 ,{0x52, "CP/M or Microport SysV/AT"} 161 ,{0x56, "GB"} 162 ,{0x61, "Speed"} 163 ,{0x63, "ISC UNIX, other System V/386, GNU HURD or Mach"} 164 ,{0x64, "Novell Netware 2.xx"} 165 ,{0x65, "Novell Netware 3.xx"} 166 ,{0x75, "PCIX"} 167 ,{0x80, "Minix 1.1 ... 1.4a"} 168 ,{0x81, "Minix 1.4b ... 1.5.10"} 169 ,{0x82, "Linux swap or Solaris x86"} 170 ,{0x83, "Linux filesystem"} 171 ,{0x93, "Amoeba filesystem"} 172 ,{0x94, "Amoeba bad block table"} 173 ,{0x9F, "BSD/OS"} 174 ,{0xA0, "Suspend to Disk"} 175 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 176 ,{0xA6, "OpenBSD"} 177 ,{0xA7, "NEXTSTEP"} 178 ,{0xA9, "NetBSD"} 179 ,{0xB7, "BSDI BSD/386 filesystem"} 180 ,{0xB8, "BSDI BSD/386 swap"} 181 ,{0xDB, "Concurrent CPM or C.DOS or CTOS"} 182 ,{0xE1, "Speed"} 183 ,{0xE3, "Speed"} 184 ,{0xE4, "Speed"} 185 ,{0xF1, "Speed"} 186 ,{0xF2, "DOS 3.3+ Secondary"} 187 ,{0xF4, "Speed"} 188 ,{0xFF, "BBT (Bad Blocks Table)"} 189}; 190 191static void print_s0(int which); 192static void print_part(int i); 193static void init_sector0(unsigned long start); 194static void init_boot(void); 195static void change_part(int i); 196static void print_params(); 197static void change_active(int which); 198static void change_code(); 199static void get_params_to_use(); 200static char *get_rootdisk(void); 201static void dos(int sec, int size, unsigned char *c, unsigned char *s, 202 unsigned char *h); 203static int open_disk(int u_flag); 204static ssize_t read_disk(off_t sector, void *buf); 205static ssize_t write_disk(off_t sector, void *buf); 206static int get_params(); 207static int read_s0(); 208static int write_s0(); 209static int ok(char *str); 210static int decimal(char *str, int *num, int deflt); 211static char *get_type(int type); 212static int read_config(char *config_file); 213static void reset_boot(void); 214static int sanitize_partition(struct dos_partition *); 215static void usage(void); 216#if 0 217static int hex(char *str, int *num, int deflt); 218static int string(char *str, char **ans); 219#endif 220 221 222int 223main(int argc, char *argv[]) 224{ 225 struct stat sb; 226 int c, i; 227 228 while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1) 229 switch (c) { 230 case 'B': 231 B_flag = 1; 232 break; 233 case 'I': 234 I_flag = 1; 235 break; 236 case 'a': 237 a_flag = 1; 238 break; 239 case 'b': 240 b_flag = optarg; 241 break; 242 case 'f': 243 f_flag = optarg; 244 break; 245 case 'i': 246 i_flag = 1; 247 break; 248 case 's': 249 s_flag = 1; 250 break; 251 case 't': 252 t_flag = 1; 253 break; 254 case 'u': 255 u_flag = 1; 256 break; 257 case 'v': 258 v_flag = 1; 259 break; 260 case '1': 261 case '2': 262 case '3': 263 case '4': 264 partition = c - '0'; 265 break; 266 default: 267 usage(); 268 } 269 if (f_flag || i_flag) 270 u_flag = 1; 271 if (t_flag) 272 v_flag = 1; 273 argc -= optind; 274 argv += optind; 275 276 if (argc == 0) { 277 disk = get_rootdisk(); 278 } else { 279 if (stat(argv[0], &sb) == 0) { 280 /* OK, full pathname given */ 281 disk = argv[0]; 282 } else if (errno == ENOENT) { 283 /* Try prepending "/dev" */ 284 if ((disk = malloc(strlen(argv[0]) + strlen(_PATH_DEV) + 285 1)) == NULL) 286 errx(1, "out of memory"); 287 strcpy(disk, _PATH_DEV); 288 strcat(disk, argv[0]); 289 } else { 290 /* other stat error, let it fail below */ 291 disk = argv[0]; 292 } 293 } 294 if (open_disk(u_flag) < 0) 295 err(1, "cannot open disk %s", disk); 296 297 /* (abu)use mboot.bootinst to probe for the sector size */ 298 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 299 err(1, "cannot allocate buffer to determine disk sector size"); 300 read_disk(0, mboot.bootinst); 301 free(mboot.bootinst); 302 mboot.bootinst = NULL; 303 304 if (s_flag) 305 { 306 int i; 307 struct dos_partition *partp; 308 309 if (read_s0()) 310 err(1, "read_s0"); 311 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 312 dos_sectors); 313 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 314 for (i = 0; i < NDOSPART; i++) { 315 partp = ((struct dos_partition *) &mboot.parts) + i; 316 if (partp->dp_start == 0 && partp->dp_size == 0) 317 continue; 318 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 319 (u_long) partp->dp_start, 320 (u_long) partp->dp_size, partp->dp_typ, 321 partp->dp_flag); 322 } 323 exit(0); 324 } 325 326 printf("******* Working on device %s *******\n",disk); 327 328 if (I_flag) 329 { 330 struct dos_partition *partp; 331 332 read_s0(); 333 reset_boot(); 334 partp = (struct dos_partition *) (&mboot.parts[0]); 335 partp->dp_typ = DOSPTYP_386BSD; 336 partp->dp_flag = ACTIVE; 337 partp->dp_start = dos_sectors; 338 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 339 dos_sectors; 340 341 dos(partp->dp_start, partp->dp_size, 342 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 343 dos(partp->dp_start + partp->dp_size - 1, partp->dp_size, 344 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 345 if (v_flag) 346 print_s0(-1); 347 write_s0(); 348 exit(0); 349 } 350 if (f_flag) 351 { 352 if (read_s0() || i_flag) 353 { 354 reset_boot(); 355 } 356 357 if (!read_config(f_flag)) 358 { 359 exit(1); 360 } 361 if (v_flag) 362 { 363 print_s0(-1); 364 } 365 if (!t_flag) 366 { 367 write_s0(); 368 } 369 } 370 else 371 { 372 if(u_flag) 373 { 374 get_params_to_use(); 375 } 376 else 377 { 378 print_params(); 379 } 380 381 if (read_s0()) 382 init_sector0(dos_sectors); 383 384 printf("Media sector size is %d\n", secsize); 385 printf("Warning: BIOS sector numbering starts with sector 1\n"); 386 printf("Information from DOS bootblock is:\n"); 387 if (partition == -1) 388 for (i = 1; i <= NDOSPART; i++) 389 change_part(i); 390 else 391 change_part(partition); 392 393 if (u_flag || a_flag) 394 change_active(partition); 395 396 if (B_flag) 397 change_code(); 398 399 if (u_flag || a_flag || B_flag) { 400 if (!t_flag) 401 { 402 printf("\nWe haven't changed the partition table yet. "); 403 printf("This is your last chance.\n"); 404 } 405 print_s0(-1); 406 if (!t_flag) 407 { 408 if (ok("Should we write new partition table?")) 409 write_s0(); 410 } 411 else 412 { 413 printf("\n-t flag specified -- partition table not written.\n"); 414 } 415 } 416 } 417 418 exit(0); 419} 420 421static void 422usage() 423{ 424 fprintf(stderr, "%s%s", 425 "usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n", 426 " fdisk -f configfile [-itv] [disk]\n"); 427 exit(1); 428} 429 430static void 431print_s0(int which) 432{ 433int i; 434 435 print_params(); 436 printf("Information from DOS bootblock is:\n"); 437 if (which == -1) 438 for (i = 1; i <= NDOSPART; i++) 439 printf("%d: ", i), print_part(i); 440 else 441 print_part(which); 442} 443 444static struct dos_partition mtpart = { 0 }; 445 446static void 447print_part(int i) 448{ 449 struct dos_partition *partp; 450 u_int64_t part_mb; 451 452 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 453 454 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 455 printf("<UNUSED>\n"); 456 return; 457 } 458 /* 459 * Be careful not to overflow. 460 */ 461 part_mb = partp->dp_size; 462 part_mb *= secsize; 463 part_mb /= (1024 * 1024); 464 printf("sysid %d,(%s)\n", partp->dp_typ, get_type(partp->dp_typ)); 465 printf(" start %lu, size %lu (%qd Meg), flag %x%s\n", 466 (u_long)partp->dp_start, 467 (u_long)partp->dp_size, 468 part_mb, 469 partp->dp_flag, 470 partp->dp_flag == ACTIVE ? " (active)" : ""); 471 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 472 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 473 ,partp->dp_shd 474 ,DPSECT(partp->dp_ssect) 475 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 476 ,partp->dp_ehd 477 ,DPSECT(partp->dp_esect)); 478} 479 480 481static void 482init_boot(void) 483{ 484 const char *fname; 485 int fd, n; 486 struct stat sb; 487 488 fname = b_flag ? b_flag : "/boot/mbr"; 489 if ((fd = open(fname, O_RDONLY)) == -1 || 490 fstat(fd, &sb) == -1) 491 err(1, "%s", fname); 492 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 493 errx(1, "%s: length must be a multiple of sector size", fname); 494 if (mboot.bootinst != NULL) 495 free(mboot.bootinst); 496 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 497 errx(1, "%s: unable to allocate read buffer", fname); 498 if ((n = read(fd, mboot.bootinst, mboot.bootinst_size)) == -1 || 499 close(fd)) 500 err(1, "%s", fname); 501 if (n != mboot.bootinst_size) 502 errx(1, "%s: short read", fname); 503} 504 505 506static void 507init_sector0(unsigned long start) 508{ 509struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]); 510 511 init_boot(); 512 513 partp->dp_typ = DOSPTYP_386BSD; 514 partp->dp_flag = ACTIVE; 515 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 516 if(start == 0) 517 start = dos_sectors; 518 partp->dp_start = start; 519 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 520 521 dos(partp->dp_start, partp->dp_size, 522 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 523 dos(partp->dp_start + partp->dp_size - 1, partp->dp_size, 524 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 525} 526 527static void 528change_part(int i) 529{ 530struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 531 532 printf("The data for partition %d is:\n", i); 533 print_part(i); 534 535 if (u_flag && ok("Do you want to change it?")) { 536 int tmp; 537 538 if (i_flag) { 539 bzero((char *)partp, sizeof (struct dos_partition)); 540 if (i == 4) { 541 init_sector0(1); 542 printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n"); 543 print_part(i); 544 } 545 } 546 547 do { 548 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 549 Decimal("start", partp->dp_start, tmp); 550 Decimal("size", partp->dp_size, tmp); 551 552 if (ok("Explicitly specify beg/end address ?")) 553 { 554 int tsec,tcyl,thd; 555 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 556 thd = partp->dp_shd; 557 tsec = DPSECT(partp->dp_ssect); 558 Decimal("beginning cylinder", tcyl, tmp); 559 Decimal("beginning head", thd, tmp); 560 Decimal("beginning sector", tsec, tmp); 561 partp->dp_scyl = DOSCYL(tcyl); 562 partp->dp_ssect = DOSSECT(tsec,tcyl); 563 partp->dp_shd = thd; 564 565 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 566 thd = partp->dp_ehd; 567 tsec = DPSECT(partp->dp_esect); 568 Decimal("ending cylinder", tcyl, tmp); 569 Decimal("ending head", thd, tmp); 570 Decimal("ending sector", tsec, tmp); 571 partp->dp_ecyl = DOSCYL(tcyl); 572 partp->dp_esect = DOSSECT(tsec,tcyl); 573 partp->dp_ehd = thd; 574 } else { 575 if (!sanitize_partition(partp)) 576 partp->dp_typ = 0; 577 dos(partp->dp_start, partp->dp_size, 578 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 579 dos(partp->dp_start + partp->dp_size - 1, partp->dp_size, 580 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 581 } 582 583 print_part(i); 584 } while (!ok("Are we happy with this entry?")); 585 } 586} 587 588static void 589print_params() 590{ 591 printf("parameters extracted from in-core disklabel are:\n"); 592 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 593 ,cyls,heads,sectors,cylsecs); 594 if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255)) 595 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 596 printf("parameters to be used for BIOS calculations are:\n"); 597 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 598 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 599} 600 601static void 602change_active(int which) 603{ 604int i; 605int active = 4, tmp; 606struct dos_partition *partp = ((struct dos_partition *) &mboot.parts); 607 608 if (a_flag && which != -1) 609 active = which; 610 if (!ok("Do you want to change the active partition?")) 611 return; 612setactive: 613 active = 4; 614 do { 615 Decimal("active partition", active, tmp); 616 if (active < 1 || 4 < active) { 617 printf("Active partition number must be in range 1-4." 618 " Try again.\n"); 619 goto setactive; 620 } 621 } while (!ok("Are you happy with this choice")); 622 for (i = 0; i < NDOSPART; i++) 623 partp[i].dp_flag = 0; 624 if (active > 0 && active <= NDOSPART) 625 partp[active-1].dp_flag = ACTIVE; 626} 627 628static void 629change_code() 630{ 631 if (ok("Do you want to change the boot code?")) 632 init_boot(); 633} 634 635void 636get_params_to_use() 637{ 638 int tmp; 639 print_params(); 640 if (ok("Do you want to change our idea of what BIOS thinks ?")) 641 { 642 do 643 { 644 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 645 Decimal("BIOS's idea of #heads", dos_heads, tmp); 646 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 647 dos_cylsecs = dos_heads * dos_sectors; 648 print_params(); 649 } 650 while(!ok("Are you happy with this choice")); 651 } 652} 653 654 655/***********************************************\ 656* Change real numbers into strange dos numbers * 657\***********************************************/ 658static void 659dos(sec, size, c, s, h) 660int sec, size; 661unsigned char *c, *s, *h; 662{ 663int cy; 664int hd; 665 666 if (sec == 0 && size == 0) { 667 *s = *c = *h = 0; 668 return; 669 } 670 671 cy = sec / ( dos_cylsecs ); 672 sec = sec - cy * ( dos_cylsecs ); 673 674 hd = sec / dos_sectors; 675 sec = (sec - hd * dos_sectors) + 1; 676 677 *h = hd; 678 *c = cy & 0xff; 679 *s = (sec & 0x3f) | ( (cy & 0x300) >> 2); 680} 681 682int fd; 683 684 /* Getting device status */ 685 686static int 687open_disk(int u_flag) 688{ 689 struct stat st; 690 691 if (stat(disk, &st) == -1) { 692 if (errno == ENOENT) 693 return -2; 694 warnx("can't get file status of %s", disk); 695 return -1; 696 } 697 if ( !(st.st_mode & S_IFCHR) ) 698 warnx("device %s is not character special", disk); 699 if ((fd = open(disk, 700 a_flag || I_flag || B_flag || u_flag ? O_RDWR : O_RDONLY)) == -1) { 701 if(errno == ENXIO) 702 return -2; 703 warnx("can't open device %s", disk); 704 return -1; 705 } 706 if (get_params(0) == -1) { 707 warnx("can't get disk parameters on %s", disk); 708 return -1; 709 } 710 return fd; 711} 712 713static ssize_t 714read_disk(off_t sector, void *buf) 715{ 716 lseek(fd,(sector * 512), 0); 717 if( secsize == 0 ) 718 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 719 { 720 /* try the read */ 721 int size = read(fd, buf, secsize); 722 if( size == secsize ) 723 /* it worked so return */ 724 return secsize; 725 } 726 else 727 return read( fd, buf, secsize ); 728 729 /* we failed to read at any of the sizes */ 730 return -1; 731} 732 733static ssize_t 734write_disk(off_t sector, void *buf) 735{ 736 lseek(fd,(sector * 512), 0); 737 /* write out in the size that the read_disk found worked */ 738 return write(fd, buf, secsize); 739} 740 741static int 742get_params() 743{ 744 745 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 746 warnx("can't get disk parameters on %s; supplying dummy ones", disk); 747 dos_cyls = cyls = 1; 748 dos_heads = heads = 1; 749 dos_sectors = sectors = 1; 750 dos_cylsecs = cylsecs = heads * sectors; 751 disksecs = cyls * heads * sectors; 752 return disksecs; 753 } 754 755 dos_cyls = cyls = disklabel.d_ncylinders; 756 dos_heads = heads = disklabel.d_ntracks; 757 dos_sectors = sectors = disklabel.d_nsectors; 758 dos_cylsecs = cylsecs = heads * sectors; 759 disksecs = cyls * heads * sectors; 760 761 return (disksecs); 762} 763 764 765static int 766read_s0() 767{ 768 mboot.bootinst_size = secsize; 769 if (mboot.bootinst != NULL) 770 free(mboot.bootinst); 771 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 772 warnx("unable to allocate buffer to read fdisk " 773 "partition table"); 774 return -1; 775 } 776 if (read_disk(0, mboot.bootinst) == -1) { 777 warnx("can't read fdisk partition table"); 778 return -1; 779 } 780 if (*(uint16_t *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 781 warnx("invalid fdisk partition table found"); 782 /* So should we initialize things */ 783 return -1; 784 } 785 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 786 return 0; 787} 788 789static int 790write_s0() 791{ 792#ifdef NOT_NOW 793 int flag; 794#endif 795 int sector; 796 797 if (iotest) { 798 print_s0(-1); 799 return 0; 800 } 801 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 802 /* 803 * write enable label sector before write (if necessary), 804 * disable after writing. 805 * needed if the disklabel protected area also protects 806 * sector 0. (e.g. empty disk) 807 */ 808#ifdef NOT_NOW 809 flag = 1; 810 if (ioctl(fd, DIOCWLABEL, &flag) < 0) 811 warn("ioctl DIOCWLABEL"); 812#endif 813 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 814 if (write_disk(sector, 815 &mboot.bootinst[sector * secsize]) == -1) { 816 warn("can't write fdisk partition table"); 817 return -1; 818#ifdef NOT_NOW 819 flag = 0; 820 (void) ioctl(fd, DIOCWLABEL, &flag); 821#endif 822 } 823#ifdef NOT_NOW 824 flag = 0; 825 (void) ioctl(fd, DIOCWLABEL, &flag); 826#endif 827 return(0); 828} 829 830 831static int 832ok(str) 833char *str; 834{ 835 printf("%s [n] ", str); 836 fgets(lbuf, LBUF, stdin); 837 lbuf[strlen(lbuf)-1] = 0; 838 839 if (*lbuf && 840 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 841 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 842 return 1; 843 else 844 return 0; 845} 846 847static int 848decimal(char *str, int *num, int deflt) 849{ 850int acc = 0, c; 851char *cp; 852 853 while (1) { 854 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 855 fgets(lbuf, LBUF, stdin); 856 lbuf[strlen(lbuf)-1] = 0; 857 858 if (!*lbuf) 859 return 0; 860 861 cp = lbuf; 862 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 863 if (!c) 864 return 0; 865 while ((c = *cp++)) { 866 if (c <= '9' && c >= '0') 867 acc = acc * 10 + c - '0'; 868 else 869 break; 870 } 871 if (c == ' ' || c == '\t') 872 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 873 if (!c) { 874 *num = acc; 875 return 1; 876 } else 877 printf("%s is an invalid decimal number. Try again.\n", 878 lbuf); 879 } 880 881} 882 883#if 0 884static int 885hex(char *str, int *num, int deflt) 886{ 887int acc = 0, c; 888char *cp; 889 890 while (1) { 891 printf("Supply a hex value for \"%s\" [%x] ", str, deflt); 892 fgets(lbuf, LBUF, stdin); 893 lbuf[strlen(lbuf)-1] = 0; 894 895 if (!*lbuf) 896 return 0; 897 898 cp = lbuf; 899 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 900 if (!c) 901 return 0; 902 while ((c = *cp++)) { 903 if (c <= '9' && c >= '0') 904 acc = (acc << 4) + c - '0'; 905 else if (c <= 'f' && c >= 'a') 906 acc = (acc << 4) + c - 'a' + 10; 907 else if (c <= 'F' && c >= 'A') 908 acc = (acc << 4) + c - 'A' + 10; 909 else 910 break; 911 } 912 if (c == ' ' || c == '\t') 913 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 914 if (!c) { 915 *num = acc; 916 return 1; 917 } else 918 printf("%s is an invalid hex number. Try again.\n", 919 lbuf); 920 } 921 922} 923 924static int 925string(char *str, char **ans) 926{ 927int c; 928char *cp = lbuf; 929 930 while (1) { 931 printf("Supply a string value for \"%s\" [%s] ", str, *ans); 932 fgets(lbuf, LBUF, stdin); 933 lbuf[strlen(lbuf)-1] = 0; 934 935 if (!*lbuf) 936 return 0; 937 938 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 939 if (c == '"') { 940 c = *++cp; 941 *ans = cp; 942 while ((c = *cp) && c != '"') cp++; 943 } else { 944 *ans = cp; 945 while ((c = *cp) && c != ' ' && c != '\t') cp++; 946 } 947 948 if (c) 949 *cp = 0; 950 return 1; 951 } 952} 953#endif 954 955static char * 956get_type(int type) 957{ 958 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 959 int counter = 0; 960 struct part_type *ptr = part_types; 961 962 963 while(counter < numentries) 964 { 965 if(ptr->type == type) 966 { 967 return(ptr->name); 968 } 969 ptr++; 970 counter++; 971 } 972 return("unknown"); 973} 974 975 976static void 977parse_config_line(line, command) 978 char *line; 979 CMD *command; 980{ 981 char *cp, *end; 982 983 cp = line; 984 while (1) /* dirty trick used to insure one exit point for this 985 function */ 986 { 987 memset(command, 0, sizeof(*command)); 988 989 while (isspace(*cp)) ++cp; 990 if (*cp == '\0' || *cp == '#') 991 { 992 break; 993 } 994 command->cmd = *cp++; 995 996 /* 997 * Parse args 998 */ 999 while (1) 1000 { 1001 while (isspace(*cp)) ++cp; 1002 if (*cp == '#') 1003 { 1004 break; /* found comment */ 1005 } 1006 if (isalpha(*cp)) 1007 { 1008 command->args[command->n_args].argtype = *cp++; 1009 } 1010 if (!isdigit(*cp)) 1011 { 1012 break; /* assume end of line */ 1013 } 1014 end = NULL; 1015 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 1016 if (cp == end) 1017 { 1018 break; /* couldn't parse number */ 1019 } 1020 cp = end; 1021 command->n_args++; 1022 } 1023 break; 1024 } 1025} 1026 1027 1028static int 1029process_geometry(command) 1030 CMD *command; 1031{ 1032 int status = 1, i; 1033 1034 while (1) 1035 { 1036 geom_processed = 1; 1037 if (part_processed) 1038 { 1039 warnx( 1040 "ERROR line %d: the geometry specification line must occur before\n\ 1041 all partition specifications", 1042 current_line_number); 1043 status = 0; 1044 break; 1045 } 1046 if (command->n_args != 3) 1047 { 1048 warnx("ERROR line %d: incorrect number of geometry args", 1049 current_line_number); 1050 status = 0; 1051 break; 1052 } 1053 dos_cyls = -1; 1054 dos_heads = -1; 1055 dos_sectors = -1; 1056 for (i = 0; i < 3; ++i) 1057 { 1058 switch (command->args[i].argtype) 1059 { 1060 case 'c': 1061 dos_cyls = command->args[i].arg_val; 1062 break; 1063 case 'h': 1064 dos_heads = command->args[i].arg_val; 1065 break; 1066 case 's': 1067 dos_sectors = command->args[i].arg_val; 1068 break; 1069 default: 1070 warnx( 1071 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1072 current_line_number, command->args[i].argtype, 1073 command->args[i].argtype); 1074 status = 0; 1075 break; 1076 } 1077 } 1078 if (status == 0) 1079 { 1080 break; 1081 } 1082 1083 dos_cylsecs = dos_heads * dos_sectors; 1084 1085 /* 1086 * Do sanity checks on parameter values 1087 */ 1088 if (dos_cyls < 0) 1089 { 1090 warnx("ERROR line %d: number of cylinders not specified", 1091 current_line_number); 1092 status = 0; 1093 } 1094 if (dos_cyls == 0 || dos_cyls > 1024) 1095 { 1096 warnx( 1097 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1098 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1099 is dedicated to FreeBSD)", 1100 current_line_number, dos_cyls); 1101 } 1102 1103 if (dos_heads < 0) 1104 { 1105 warnx("ERROR line %d: number of heads not specified", 1106 current_line_number); 1107 status = 0; 1108 } 1109 else if (dos_heads < 1 || dos_heads > 256) 1110 { 1111 warnx("ERROR line %d: number of heads must be within (1-256)", 1112 current_line_number); 1113 status = 0; 1114 } 1115 1116 if (dos_sectors < 0) 1117 { 1118 warnx("ERROR line %d: number of sectors not specified", 1119 current_line_number); 1120 status = 0; 1121 } 1122 else if (dos_sectors < 1 || dos_sectors > 63) 1123 { 1124 warnx("ERROR line %d: number of sectors must be within (1-63)", 1125 current_line_number); 1126 status = 0; 1127 } 1128 1129 break; 1130 } 1131 return (status); 1132} 1133 1134 1135static int 1136process_partition(command) 1137 CMD *command; 1138{ 1139 int status = 0, partition; 1140 u_int32_t prev_head_boundary, prev_cyl_boundary; 1141 u_int32_t adj_size, max_end; 1142 struct dos_partition *partp; 1143 1144 while (1) 1145 { 1146 part_processed = 1; 1147 if (command->n_args != 4) 1148 { 1149 warnx("ERROR line %d: incorrect number of partition args", 1150 current_line_number); 1151 break; 1152 } 1153 partition = command->args[0].arg_val; 1154 if (partition < 1 || partition > 4) 1155 { 1156 warnx("ERROR line %d: invalid partition number %d", 1157 current_line_number, partition); 1158 break; 1159 } 1160 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1161 bzero((char *)partp, sizeof (struct dos_partition)); 1162 partp->dp_typ = command->args[1].arg_val; 1163 partp->dp_start = command->args[2].arg_val; 1164 partp->dp_size = command->args[3].arg_val; 1165 max_end = partp->dp_start + partp->dp_size; 1166 1167 if (partp->dp_typ == 0) 1168 { 1169 /* 1170 * Get out, the partition is marked as unused. 1171 */ 1172 /* 1173 * Insure that it's unused. 1174 */ 1175 bzero((char *)partp, sizeof (struct dos_partition)); 1176 status = 1; 1177 break; 1178 } 1179 1180 /* 1181 * Adjust start upwards, if necessary, to fall on an head boundary. 1182 */ 1183 if (partp->dp_start % dos_sectors != 0) 1184 { 1185 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1186 if (max_end < dos_sectors || 1187 prev_head_boundary > max_end - dos_sectors) 1188 { 1189 /* 1190 * Can't go past end of partition 1191 */ 1192 warnx( 1193 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1194 a head boundary", 1195 current_line_number, partition); 1196 break; 1197 } 1198 warnx( 1199 "WARNING: adjusting start offset of partition %d\n\ 1200 from %u to %u, to fall on a head boundary", 1201 partition, (u_int)partp->dp_start, 1202 (u_int)(prev_head_boundary + dos_sectors)); 1203 partp->dp_start = prev_head_boundary + dos_sectors; 1204 } 1205 1206 /* 1207 * Adjust size downwards, if necessary, to fall on a cylinder 1208 * boundary. 1209 */ 1210 prev_cyl_boundary = 1211 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1212 if (prev_cyl_boundary > partp->dp_start) 1213 adj_size = prev_cyl_boundary - partp->dp_start; 1214 else 1215 { 1216 warnx( 1217 "ERROR: could not adjust partition to start on a head boundary\n\ 1218 and end on a cylinder boundary."); 1219 return (0); 1220 } 1221 if (adj_size != partp->dp_size) 1222 { 1223 warnx( 1224 "WARNING: adjusting size of partition %d from %u to %u\n\ 1225 to end on a cylinder boundary", 1226 partition, (u_int)partp->dp_size, (u_int)adj_size); 1227 partp->dp_size = adj_size; 1228 } 1229 if (partp->dp_size == 0) 1230 { 1231 warnx("ERROR line %d: size for partition %d is zero", 1232 current_line_number, partition); 1233 break; 1234 } 1235 1236 dos(partp->dp_start, partp->dp_size, 1237 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 1238 dos(partp->dp_start+partp->dp_size - 1, partp->dp_size, 1239 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 1240 status = 1; 1241 break; 1242 } 1243 return (status); 1244} 1245 1246 1247static int 1248process_active(command) 1249 CMD *command; 1250{ 1251 int status = 0, partition, i; 1252 struct dos_partition *partp; 1253 1254 while (1) 1255 { 1256 active_processed = 1; 1257 if (command->n_args != 1) 1258 { 1259 warnx("ERROR line %d: incorrect number of active args", 1260 current_line_number); 1261 status = 0; 1262 break; 1263 } 1264 partition = command->args[0].arg_val; 1265 if (partition < 1 || partition > 4) 1266 { 1267 warnx("ERROR line %d: invalid partition number %d", 1268 current_line_number, partition); 1269 break; 1270 } 1271 /* 1272 * Reset active partition 1273 */ 1274 partp = ((struct dos_partition *) &mboot.parts); 1275 for (i = 0; i < NDOSPART; i++) 1276 partp[i].dp_flag = 0; 1277 partp[partition-1].dp_flag = ACTIVE; 1278 1279 status = 1; 1280 break; 1281 } 1282 return (status); 1283} 1284 1285 1286static int 1287process_line(line) 1288 char *line; 1289{ 1290 CMD command; 1291 int status = 1; 1292 1293 while (1) 1294 { 1295 parse_config_line(line, &command); 1296 switch (command.cmd) 1297 { 1298 case 0: 1299 /* 1300 * Comment or blank line 1301 */ 1302 break; 1303 case 'g': 1304 /* 1305 * Set geometry 1306 */ 1307 status = process_geometry(&command); 1308 break; 1309 case 'p': 1310 status = process_partition(&command); 1311 break; 1312 case 'a': 1313 status = process_active(&command); 1314 break; 1315 default: 1316 status = 0; 1317 break; 1318 } 1319 break; 1320 } 1321 return (status); 1322} 1323 1324 1325static int 1326read_config(config_file) 1327 char *config_file; 1328{ 1329 FILE *fp = NULL; 1330 int status = 1; 1331 char buf[1010]; 1332 1333 while (1) /* dirty trick used to insure one exit point for this 1334 function */ 1335 { 1336 if (strcmp(config_file, "-") != 0) 1337 { 1338 /* 1339 * We're not reading from stdin 1340 */ 1341 if ((fp = fopen(config_file, "r")) == NULL) 1342 { 1343 status = 0; 1344 break; 1345 } 1346 } 1347 else 1348 { 1349 fp = stdin; 1350 } 1351 current_line_number = 0; 1352 while (!feof(fp)) 1353 { 1354 if (fgets(buf, sizeof(buf), fp) == NULL) 1355 { 1356 break; 1357 } 1358 ++current_line_number; 1359 status = process_line(buf); 1360 if (status == 0) 1361 { 1362 break; 1363 } 1364 } 1365 break; 1366 } 1367 if (fp) 1368 { 1369 /* 1370 * It doesn't matter if we're reading from stdin, as we've reached EOF 1371 */ 1372 fclose(fp); 1373 } 1374 return (status); 1375} 1376 1377 1378static void 1379reset_boot(void) 1380{ 1381 int i; 1382 struct dos_partition *partp; 1383 1384 init_boot(); 1385 for (i = 0; i < 4; ++i) 1386 { 1387 partp = ((struct dos_partition *) &mboot.parts) + i; 1388 bzero((char *)partp, sizeof (struct dos_partition)); 1389 } 1390} 1391 1392static int 1393sanitize_partition(partp) 1394 struct dos_partition *partp; 1395{ 1396 u_int32_t prev_head_boundary, prev_cyl_boundary; 1397 u_int32_t adj_size, max_end; 1398 1399 max_end = partp->dp_start + partp->dp_size; 1400 1401 /* 1402 * Adjust start upwards, if necessary, to fall on an head boundary. 1403 */ 1404 if (partp->dp_start % dos_sectors != 0) { 1405 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1406 if (max_end < dos_sectors || 1407 prev_head_boundary > max_end - dos_sectors) { 1408 /* 1409 * Can't go past end of partition 1410 */ 1411 warnx( 1412 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1413 return (0); 1414 } 1415 warnx( 1416 "WARNING: adjusting start offset of partition\n\ 1417 to %u to fall on a head boundary", 1418 (u_int)(prev_head_boundary + dos_sectors)); 1419 partp->dp_start = prev_head_boundary + dos_sectors; 1420 } 1421 1422 /* 1423 * Adjust size downwards, if necessary, to fall on a cylinder 1424 * boundary. 1425 */ 1426 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) / dos_cylsecs) * 1427 dos_cylsecs; 1428 if (prev_cyl_boundary > partp->dp_start) 1429 adj_size = prev_cyl_boundary - partp->dp_start; 1430 else 1431 { 1432 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1433 and end on a cylinder boundary."); 1434 return (0); 1435 } 1436 if (adj_size != partp->dp_size) { 1437 warnx( 1438 "WARNING: adjusting size of partition to %u to end on a\n\ 1439 cylinder boundary", 1440 (u_int)adj_size); 1441 partp->dp_size = adj_size; 1442 } 1443 if (partp->dp_size == 0) { 1444 warnx("ERROR: size for partition is zero"); 1445 return (0); 1446 } 1447 1448 return (1); 1449} 1450 1451/* 1452 * Try figuring out the root device's canonical disk name. 1453 * The following choices are considered: 1454 * /dev/ad0s1a => /dev/ad0 1455 * /dev/da0a => /dev/da0 1456 * /dev/vinum/root => /dev/vinum/root 1457 */ 1458static char * 1459get_rootdisk(void) 1460{ 1461 struct statfs rootfs; 1462 regex_t re; 1463#define NMATCHES 2 1464 regmatch_t rm[NMATCHES]; 1465 char *s; 1466 int rv; 1467 1468 if (statfs("/", &rootfs) == -1) 1469 err(1, "statfs(\"/\")"); 1470 1471 if ((rv = regcomp(&re, "^(/dev/.*)(\\d+(s\\d+)?[a-h])?$", 1472 REG_EXTENDED)) != 0) 1473 errx(1, "regcomp() failed (%d)", rv); 1474 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1475 errx(1, 1476"mounted root fs resource doesn't match expectations (regexec returned %d)", 1477 rv); 1478 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1479 errx(1, "out of memory"); 1480 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1481 rm[1].rm_eo - rm[1].rm_so); 1482 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1483 1484 return s; 1485} 1486