fdisk.c revision 63218
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 63218 2000-07-15 13:37:47Z ache $"; 30#endif /* not lint */ 31 32#include <sys/disklabel.h> 33#include <sys/stat.h> 34#include <ctype.h> 35#include <fcntl.h> 36#include <err.h> 37#include <errno.h> 38#include <stdio.h> 39#include <stdlib.h> 40#include <string.h> 41#include <unistd.h> 42 43int iotest; 44 45#define LBUF 100 46static char lbuf[LBUF]; 47 48#define MBRSIGOFF 510 49 50/* 51 * 52 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 53 * 54 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 55 * Copyright (c) 1989 Robert. V. Baron 56 * Created. 57 */ 58 59#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 60#define Hex(str, ans, tmp) if (hex(str, &tmp, ans)) ans = tmp 61#define String(str, ans, len) {char *z = ans; char **dflt = &z; if (string(str, dflt)) strncpy(ans, *dflt, len); } 62 63#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 64 65#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 66#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 67int secsize = 0; /* the sensed sector size */ 68 69const char *disk; 70const char *disks[] = 71{ 72 "/dev/ad0", "/dev/wd0", "/dev/da0", "/dev/od0", 0 73}; 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 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 175 ,{0xA6, "OpenBSD"} 176 ,{0xA7, "NEXTSTEP"} 177 ,{0xA9, "NetBSD"} 178 ,{0xB7, "BSDI BSD/386 filesystem"} 179 ,{0xB8, "BSDI BSD/386 swap"} 180 ,{0xDB, "Concurrent CPM or C.DOS or CTOS"} 181 ,{0xE1, "Speed"} 182 ,{0xE3, "Speed"} 183 ,{0xE4, "Speed"} 184 ,{0xF1, "Speed"} 185 ,{0xF2, "DOS 3.3+ Secondary"} 186 ,{0xF4, "Speed"} 187 ,{0xFF, "BBT (Bad Blocks Table)"} 188}; 189 190static void print_s0(int which); 191static void print_part(int i); 192static void init_sector0(unsigned long start); 193static void init_boot(void); 194static void change_part(int i); 195static void print_params(); 196static void change_active(int which); 197static void change_code(); 198static void get_params_to_use(); 199static void dos(int sec, int size, unsigned char *c, unsigned char *s, 200 unsigned char *h); 201static int open_disk(int u_flag); 202static ssize_t read_disk(off_t sector, void *buf); 203static ssize_t write_disk(off_t sector, void *buf); 204static int get_params(); 205static int read_s0(); 206static int write_s0(); 207static int ok(char *str); 208static int decimal(char *str, int *num, int deflt); 209static char *get_type(int type); 210static int read_config(char *config_file); 211static void reset_boot(void); 212static void usage(void); 213#if 0 214static int hex(char *str, int *num, int deflt); 215static int string(char *str, char **ans); 216#endif 217 218 219int 220main(int argc, char *argv[]) 221{ 222 int c, i; 223 224 while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1) 225 switch (c) { 226 case 'B': 227 B_flag = 1; 228 break; 229 case 'I': 230 I_flag = 1; 231 break; 232 case 'a': 233 a_flag = 1; 234 break; 235 case 'b': 236 b_flag = optarg; 237 break; 238 case 'f': 239 f_flag = optarg; 240 break; 241 case 'i': 242 i_flag = 1; 243 break; 244 case 's': 245 s_flag = 1; 246 break; 247 case 't': 248 t_flag = 1; 249 break; 250 case 'u': 251 u_flag = 1; 252 break; 253 case 'v': 254 v_flag = 1; 255 break; 256 case '1': 257 case '2': 258 case '3': 259 case '4': 260 partition = c - '0'; 261 break; 262 default: 263 usage(); 264 } 265 if (f_flag || i_flag) 266 u_flag = 1; 267 if (t_flag) 268 v_flag = 1; 269 argc -= optind; 270 argv += optind; 271 272 if (argc > 0) 273 { 274 static char realname[12]; 275 276 if(strncmp(argv[0], "/dev", 4) == 0) 277 disk = argv[0]; 278 else 279 { 280 snprintf(realname, 12, "/dev/%s", argv[0]); 281 disk = realname; 282 } 283 284 if (open_disk(u_flag) < 0) 285 err(1, "cannot open disk %s", disk); 286 } 287 else 288 { 289 int rv = 0; 290 291 for(i = 0; disks[i]; i++) 292 { 293 disk = disks[i]; 294 rv = open_disk(u_flag); 295 if(rv != -2) break; 296 } 297 if(rv < 0) 298 err(1, "cannot open any disk"); 299 } 300 301 /* (abu)use mboot.bootinst to probe for the sector size */ 302 if (mboot.bootinst != NULL) 303 free(mboot.bootinst); 304 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 305 err(1, "cannot allocate buffer to determine disk sector size"); 306 read_disk(0, mboot.bootinst); 307 308 if (s_flag) 309 { 310 int i; 311 struct dos_partition *partp; 312 313 if (read_s0()) 314 err(1, "read_s0"); 315 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 316 dos_sectors); 317 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 318 for (i = 0; i < NDOSPART; i++) { 319 partp = ((struct dos_partition *) &mboot.parts) + i; 320 if (partp->dp_start == 0 && partp->dp_size == 0) 321 continue; 322 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 323 (u_long) partp->dp_start, 324 (u_long) partp->dp_size, partp->dp_typ, 325 partp->dp_flag); 326 } 327 exit(0); 328 } 329 330 printf("******* Working on device %s *******\n",disk); 331 332 if (I_flag) 333 { 334 struct dos_partition *partp; 335 336 read_s0(); 337 reset_boot(); 338 partp = (struct dos_partition *) (&mboot.parts[0]); 339 partp->dp_typ = DOSPTYP_386BSD; 340 partp->dp_flag = ACTIVE; 341 partp->dp_start = dos_sectors; 342 partp->dp_size = ((disksecs - dos_sectors) / dos_cylsecs) * 343 dos_cylsecs; 344 345 dos(partp->dp_start, partp->dp_size, 346 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 347 dos(partp->dp_start + partp->dp_size - 1, partp->dp_size, 348 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 349 if (v_flag) 350 print_s0(-1); 351 write_s0(); 352 exit(0); 353 } 354 if (f_flag) 355 { 356 if (read_s0() || i_flag) 357 { 358 reset_boot(); 359 } 360 361 if (!read_config(f_flag)) 362 { 363 exit(1); 364 } 365 if (v_flag) 366 { 367 print_s0(-1); 368 } 369 if (!t_flag) 370 { 371 write_s0(); 372 } 373 } 374 else 375 { 376 if(u_flag) 377 { 378 get_params_to_use(); 379 } 380 else 381 { 382 print_params(); 383 } 384 385 if (read_s0()) 386 init_sector0(1); 387 388 printf("Media sector size is %d\n", secsize); 389 printf("Warning: BIOS sector numbering starts with sector 1\n"); 390 printf("Information from DOS bootblock is:\n"); 391 if (partition == -1) 392 for (i = 1; i <= NDOSPART; i++) 393 change_part(i); 394 else 395 change_part(partition); 396 397 if (u_flag || a_flag) 398 change_active(partition); 399 400 if (B_flag) 401 change_code(); 402 403 if (u_flag || a_flag || B_flag) { 404 if (!t_flag) 405 { 406 printf("\nWe haven't changed the partition table yet. "); 407 printf("This is your last chance.\n"); 408 } 409 print_s0(-1); 410 if (!t_flag) 411 { 412 if (ok("Should we write new partition table?")) 413 write_s0(); 414 } 415 else 416 { 417 printf("\n-t flag specified -- partition table not written.\n"); 418 } 419 } 420 } 421 422 exit(0); 423} 424 425static void 426usage() 427{ 428 fprintf(stderr, "%s%s", 429 "usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n", 430 " fdisk -f configfile [-itv] [disk]\n"); 431 exit(1); 432} 433 434static void 435print_s0(int which) 436{ 437int i; 438 439 print_params(); 440 printf("Information from DOS bootblock is:\n"); 441 if (which == -1) 442 for (i = 1; i <= NDOSPART; i++) 443 printf("%d: ", i), print_part(i); 444 else 445 print_part(which); 446} 447 448static struct dos_partition mtpart = { 0 }; 449 450static void 451print_part(int i) 452{ 453 struct dos_partition *partp; 454 u_int64_t part_mb; 455 456 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 457 458 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 459 printf("<UNUSED>\n"); 460 return; 461 } 462 /* 463 * Be careful not to overflow. 464 */ 465 part_mb = partp->dp_size; 466 part_mb *= secsize; 467 part_mb /= (1024 * 1024); 468 printf("sysid %d,(%s)\n", partp->dp_typ, get_type(partp->dp_typ)); 469 printf(" start %lu, size %lu (%qd Meg), flag %x%s\n", 470 (u_long)partp->dp_start, 471 (u_long)partp->dp_size, 472 part_mb, 473 partp->dp_flag, 474 partp->dp_flag == ACTIVE ? " (active)" : ""); 475 printf("\tbeg: cyl %d/ sector %d/ head %d;\n\tend: cyl %d/ sector %d/ head %d\n" 476 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 477 ,DPSECT(partp->dp_ssect) 478 ,partp->dp_shd 479 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 480 ,DPSECT(partp->dp_esect) 481 ,partp->dp_ehd); 482} 483 484 485static void 486init_boot(void) 487{ 488 const char *fname; 489 int fd, n; 490 struct stat sb; 491 492 fname = b_flag ? b_flag : "/boot/mbr"; 493 if ((fd = open(fname, O_RDONLY)) == -1 || 494 fstat(fd, &sb) == -1) 495 err(1, "%s", fname); 496 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 497 errx(1, "%s: length must be a multiple of sector size", fname); 498 if (mboot.bootinst != NULL) 499 free(mboot.bootinst); 500 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 501 errx(1, "%s: unable to allocate read buffer", fname); 502 if ((n = read(fd, mboot.bootinst, mboot.bootinst_size)) == -1 || 503 close(fd)) 504 err(1, "%s", fname); 505 if (n != mboot.bootinst_size) 506 errx(1, "%s: short read", fname); 507} 508 509 510static void 511init_sector0(unsigned long start) 512{ 513struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]); 514unsigned long size; 515 516 init_boot(); 517 518 partp->dp_typ = DOSPTYP_386BSD; 519 partp->dp_flag = ACTIVE; 520 /* ensure cylinder boundaries */ 521 start = (start / dos_sectors) * dos_sectors; 522 if(start == 0) 523 start = dos_sectors; 524 size = ((disksecs - start) / dos_cylsecs) * dos_cylsecs; 525 partp->dp_start = start; 526 partp->dp_size = size; 527 528 dos(partp->dp_start, partp->dp_size, 529 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 530 dos(partp->dp_start + partp->dp_size - 1, partp->dp_size, 531 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 532} 533 534static void 535change_part(int i) 536{ 537struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 538 539 printf("The data for partition %d is:\n", i); 540 print_part(i); 541 542 if (u_flag && ok("Do you want to change it?")) { 543 int tmp; 544 545 if (i_flag) { 546 bzero((char *)partp, sizeof (struct dos_partition)); 547 if (i == 4) { 548 init_sector0(1); 549 printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n"); 550 print_part(i); 551 } 552 } 553 554 do { 555 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 556 Decimal("start", partp->dp_start, tmp); 557 Decimal("size", partp->dp_size, tmp); 558 559 if (ok("Explicitly specify beg/end address ?")) 560 { 561 int tsec,tcyl,thd; 562 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 563 thd = partp->dp_shd; 564 tsec = DPSECT(partp->dp_ssect); 565 Decimal("beginning cylinder", tcyl, tmp); 566 Decimal("beginning head", thd, tmp); 567 Decimal("beginning sector", tsec, tmp); 568 partp->dp_scyl = DOSCYL(tcyl); 569 partp->dp_ssect = DOSSECT(tsec,tcyl); 570 partp->dp_shd = thd; 571 572 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 573 thd = partp->dp_ehd; 574 tsec = DPSECT(partp->dp_esect); 575 Decimal("ending cylinder", tcyl, tmp); 576 Decimal("ending head", thd, tmp); 577 Decimal("ending sector", tsec, tmp); 578 partp->dp_ecyl = DOSCYL(tcyl); 579 partp->dp_esect = DOSSECT(tsec,tcyl); 580 partp->dp_ehd = thd; 581 } else { 582 if(partp->dp_start % dos_sectors != 0) { 583 printf("Adjusting partition to start at a " 584 "cylinder boundary\n"); 585 partp->dp_start = 586 (partp->dp_start / dos_sectors) * 587 dos_sectors; 588 } 589 if(partp->dp_size % dos_cylsecs != 0) { 590 printf("Adjusting partition to end at a " 591 "cylinder boundary\n"); 592 partp->dp_size = 593 (partp->dp_size / dos_cylsecs) * 594 dos_cylsecs; 595 } 596 dos(partp->dp_start, partp->dp_size, 597 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 598 dos(partp->dp_start + partp->dp_size - 1, partp->dp_size, 599 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 600 } 601 602 print_part(i); 603 } while (!ok("Are we happy with this entry?")); 604 } 605} 606 607static void 608print_params() 609{ 610 printf("parameters extracted from in-core disklabel are:\n"); 611 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 612 ,cyls,heads,sectors,cylsecs); 613 if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255)) 614 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 615 printf("parameters to be used for BIOS calculations are:\n"); 616 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 617 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 618} 619 620static void 621change_active(int which) 622{ 623int i; 624int active = 4, tmp; 625struct dos_partition *partp = ((struct dos_partition *) &mboot.parts); 626 627 if (a_flag && which != -1) 628 active = which; 629 if (!ok("Do you want to change the active partition?")) 630 return; 631setactive: 632 active = 4; 633 do { 634 Decimal("active partition", active, tmp); 635 if (active < 1 || 4 < active) { 636 printf("Active partition number must be in range 1-4." 637 " Try again.\n"); 638 goto setactive; 639 } 640 } while (!ok("Are you happy with this choice")); 641 for (i = 0; i < NDOSPART; i++) 642 partp[i].dp_flag = 0; 643 if (active > 0 && active <= NDOSPART) 644 partp[active-1].dp_flag = ACTIVE; 645} 646 647static void 648change_code() 649{ 650 if (ok("Do you want to change the boot code?")) 651 init_boot(); 652} 653 654void 655get_params_to_use() 656{ 657 int tmp; 658 print_params(); 659 if (ok("Do you want to change our idea of what BIOS thinks ?")) 660 { 661 do 662 { 663 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 664 Decimal("BIOS's idea of #heads", dos_heads, tmp); 665 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 666 dos_cylsecs = dos_heads * dos_sectors; 667 print_params(); 668 } 669 while(!ok("Are you happy with this choice")); 670 } 671} 672 673 674/***********************************************\ 675* Change real numbers into strange dos numbers * 676\***********************************************/ 677static void 678dos(sec, size, c, s, h) 679int sec, size; 680unsigned char *c, *s, *h; 681{ 682int cy; 683int hd; 684 685 if (sec == 0 && size == 0) { 686 *s = *c = *h = 0; 687 return; 688 } 689 690 cy = sec / ( dos_cylsecs ); 691 sec = sec - cy * ( dos_cylsecs ); 692 693 hd = sec / dos_sectors; 694 sec = (sec - hd * dos_sectors) + 1; 695 696 *h = hd; 697 *c = cy & 0xff; 698 *s = (sec & 0x3f) | ( (cy & 0x300) >> 2); 699} 700 701int fd; 702 703 /* Getting device status */ 704 705static int 706open_disk(int u_flag) 707{ 708struct stat st; 709 710 if (stat(disk, &st) == -1) { 711 warnx("can't get file status of %s", disk); 712 return -1; 713 } 714 if ( !(st.st_mode & S_IFCHR) ) 715 warnx("device %s is not character special", disk); 716 if ((fd = open(disk, 717 a_flag || I_flag || B_flag || u_flag ? O_RDWR : O_RDONLY)) == -1) { 718 if(errno == ENXIO) 719 return -2; 720 warnx("can't open device %s", disk); 721 return -1; 722 } 723 if (get_params(0) == -1) { 724 warnx("can't get disk parameters on %s", disk); 725 return -1; 726 } 727 return fd; 728} 729 730static ssize_t 731read_disk(off_t sector, void *buf) 732{ 733 lseek(fd,(sector * 512), 0); 734 if( secsize == 0 ) 735 for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 ) 736 { 737 /* try the read */ 738 int size = read(fd, buf, secsize); 739 if( size == secsize ) 740 /* it worked so return */ 741 return secsize; 742 } 743 else 744 return read( fd, buf, secsize ); 745 746 /* we failed to read at any of the sizes */ 747 return -1; 748} 749 750static ssize_t 751write_disk(off_t sector, void *buf) 752{ 753 lseek(fd,(sector * 512), 0); 754 /* write out in the size that the read_disk found worked */ 755 return write(fd, buf, secsize); 756} 757 758static int 759get_params() 760{ 761 762 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 763 warnx("can't get disk parameters on %s; supplying dummy ones", disk); 764 dos_cyls = cyls = 1; 765 dos_heads = heads = 1; 766 dos_sectors = sectors = 1; 767 dos_cylsecs = cylsecs = heads * sectors; 768 disksecs = cyls * heads * sectors; 769 return disksecs; 770 } 771 772 dos_cyls = cyls = disklabel.d_ncylinders; 773 dos_heads = heads = disklabel.d_ntracks; 774 dos_sectors = sectors = disklabel.d_nsectors; 775 dos_cylsecs = cylsecs = heads * sectors; 776 disksecs = cyls * heads * sectors; 777 778 return (disksecs); 779} 780 781 782static int 783read_s0() 784{ 785 mboot.bootinst_size = secsize; 786 if (mboot.bootinst != NULL) 787 free(mboot.bootinst); 788 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 789 warnx("unable to allocate buffer to read fdisk " 790 "partition table"); 791 return -1; 792 } 793 if (read_disk(0, mboot.bootinst) == -1) { 794 warnx("can't read fdisk partition table"); 795 return -1; 796 } 797 if (*(int *)&mboot.bootinst[MBRSIGOFF] != BOOT_MAGIC) { 798 warnx("invalid fdisk partition table found"); 799 /* So should we initialize things */ 800 return -1; 801 } 802 memcpy(mboot.parts, &mboot.bootinst[DOSPARTOFF], sizeof(mboot.parts)); 803 return 0; 804} 805 806static int 807write_s0() 808{ 809#ifdef NOT_NOW 810 int flag; 811#endif 812 int sector; 813 814 if (iotest) { 815 print_s0(-1); 816 return 0; 817 } 818 memcpy(&mboot.bootinst[DOSPARTOFF], mboot.parts, sizeof(mboot.parts)); 819 /* 820 * write enable label sector before write (if necessary), 821 * disable after writing. 822 * needed if the disklabel protected area also protects 823 * sector 0. (e.g. empty disk) 824 */ 825#ifdef NOT_NOW 826 flag = 1; 827 if (ioctl(fd, DIOCWLABEL, &flag) < 0) 828 warn("ioctl DIOCWLABEL"); 829#endif 830 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 831 if (write_disk(sector, 832 &mboot.bootinst[sector * secsize]) == -1) { 833 warn("can't write fdisk partition table"); 834 return -1; 835#ifdef NOT_NOW 836 flag = 0; 837 (void) ioctl(fd, DIOCWLABEL, &flag); 838#endif 839 } 840#ifdef NOT_NOW 841 flag = 0; 842 (void) ioctl(fd, DIOCWLABEL, &flag); 843#endif 844 return(0); 845} 846 847 848static int 849ok(str) 850char *str; 851{ 852 printf("%s [n] ", str); 853 fgets(lbuf, LBUF, stdin); 854 lbuf[strlen(lbuf)-1] = 0; 855 856 if (*lbuf && 857 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 858 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 859 return 1; 860 else 861 return 0; 862} 863 864static int 865decimal(char *str, int *num, int deflt) 866{ 867int acc = 0, c; 868char *cp; 869 870 while (1) { 871 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 872 fgets(lbuf, LBUF, stdin); 873 lbuf[strlen(lbuf)-1] = 0; 874 875 if (!*lbuf) 876 return 0; 877 878 cp = lbuf; 879 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 880 if (!c) 881 return 0; 882 while ((c = *cp++)) { 883 if (c <= '9' && c >= '0') 884 acc = acc * 10 + c - '0'; 885 else 886 break; 887 } 888 if (c == ' ' || c == '\t') 889 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 890 if (!c) { 891 *num = acc; 892 return 1; 893 } else 894 printf("%s is an invalid decimal number. Try again.\n", 895 lbuf); 896 } 897 898} 899 900#if 0 901static int 902hex(char *str, int *num, int deflt) 903{ 904int acc = 0, c; 905char *cp; 906 907 while (1) { 908 printf("Supply a hex value for \"%s\" [%x] ", str, deflt); 909 fgets(lbuf, LBUF, stdin); 910 lbuf[strlen(lbuf)-1] = 0; 911 912 if (!*lbuf) 913 return 0; 914 915 cp = lbuf; 916 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 917 if (!c) 918 return 0; 919 while ((c = *cp++)) { 920 if (c <= '9' && c >= '0') 921 acc = (acc << 4) + c - '0'; 922 else if (c <= 'f' && c >= 'a') 923 acc = (acc << 4) + c - 'a' + 10; 924 else if (c <= 'F' && c >= 'A') 925 acc = (acc << 4) + c - 'A' + 10; 926 else 927 break; 928 } 929 if (c == ' ' || c == '\t') 930 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 931 if (!c) { 932 *num = acc; 933 return 1; 934 } else 935 printf("%s is an invalid hex number. Try again.\n", 936 lbuf); 937 } 938 939} 940 941static int 942string(char *str, char **ans) 943{ 944int c; 945char *cp = lbuf; 946 947 while (1) { 948 printf("Supply a string value for \"%s\" [%s] ", str, *ans); 949 fgets(lbuf, LBUF, stdin); 950 lbuf[strlen(lbuf)-1] = 0; 951 952 if (!*lbuf) 953 return 0; 954 955 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 956 if (c == '"') { 957 c = *++cp; 958 *ans = cp; 959 while ((c = *cp) && c != '"') cp++; 960 } else { 961 *ans = cp; 962 while ((c = *cp) && c != ' ' && c != '\t') cp++; 963 } 964 965 if (c) 966 *cp = 0; 967 return 1; 968 } 969} 970#endif 971 972static char * 973get_type(int type) 974{ 975 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 976 int counter = 0; 977 struct part_type *ptr = part_types; 978 979 980 while(counter < numentries) 981 { 982 if(ptr->type == type) 983 { 984 return(ptr->name); 985 } 986 ptr++; 987 counter++; 988 } 989 return("unknown"); 990} 991 992 993static void 994parse_config_line(line, command) 995 char *line; 996 CMD *command; 997{ 998 char *cp, *end; 999 1000 cp = line; 1001 while (1) /* dirty trick used to insure one exit point for this 1002 function */ 1003 { 1004 memset(command, 0, sizeof(*command)); 1005 1006 while (isspace(*cp)) ++cp; 1007 if (*cp == '\0' || *cp == '#') 1008 { 1009 break; 1010 } 1011 command->cmd = *cp++; 1012 1013 /* 1014 * Parse args 1015 */ 1016 while (1) 1017 { 1018 while (isspace(*cp)) ++cp; 1019 if (*cp == '#') 1020 { 1021 break; /* found comment */ 1022 } 1023 if (isalpha(*cp)) 1024 { 1025 command->args[command->n_args].argtype = *cp++; 1026 } 1027 if (!isdigit(*cp)) 1028 { 1029 break; /* assume end of line */ 1030 } 1031 end = NULL; 1032 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 1033 if (cp == end) 1034 { 1035 break; /* couldn't parse number */ 1036 } 1037 cp = end; 1038 command->n_args++; 1039 } 1040 break; 1041 } 1042} 1043 1044 1045static int 1046process_geometry(command) 1047 CMD *command; 1048{ 1049 int status = 1, i; 1050 1051 while (1) 1052 { 1053 geom_processed = 1; 1054 if (part_processed) 1055 { 1056 warnx( 1057 "ERROR line %d: the geometry specification line must occur before\n\ 1058 all partition specifications", 1059 current_line_number); 1060 status = 0; 1061 break; 1062 } 1063 if (command->n_args != 3) 1064 { 1065 warnx("ERROR line %d: incorrect number of geometry args", 1066 current_line_number); 1067 status = 0; 1068 break; 1069 } 1070 dos_cyls = -1; 1071 dos_heads = -1; 1072 dos_sectors = -1; 1073 for (i = 0; i < 3; ++i) 1074 { 1075 switch (command->args[i].argtype) 1076 { 1077 case 'c': 1078 dos_cyls = command->args[i].arg_val; 1079 break; 1080 case 'h': 1081 dos_heads = command->args[i].arg_val; 1082 break; 1083 case 's': 1084 dos_sectors = command->args[i].arg_val; 1085 break; 1086 default: 1087 warnx( 1088 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1089 current_line_number, command->args[i].argtype, 1090 command->args[i].argtype); 1091 status = 0; 1092 break; 1093 } 1094 } 1095 if (status == 0) 1096 { 1097 break; 1098 } 1099 1100 dos_cylsecs = dos_heads * dos_sectors; 1101 1102 /* 1103 * Do sanity checks on parameter values 1104 */ 1105 if (dos_cyls < 0) 1106 { 1107 warnx("ERROR line %d: number of cylinders not specified", 1108 current_line_number); 1109 status = 0; 1110 } 1111 if (dos_cyls == 0 || dos_cyls > 1024) 1112 { 1113 warnx( 1114 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1115 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1116 is dedicated to FreeBSD)", 1117 current_line_number, dos_cyls); 1118 } 1119 1120 if (dos_heads < 0) 1121 { 1122 warnx("ERROR line %d: number of heads not specified", 1123 current_line_number); 1124 status = 0; 1125 } 1126 else if (dos_heads < 1 || dos_heads > 256) 1127 { 1128 warnx("ERROR line %d: number of heads must be within (1-256)", 1129 current_line_number); 1130 status = 0; 1131 } 1132 1133 if (dos_sectors < 0) 1134 { 1135 warnx("ERROR line %d: number of sectors not specified", 1136 current_line_number); 1137 status = 0; 1138 } 1139 else if (dos_sectors < 1 || dos_sectors > 63) 1140 { 1141 warnx("ERROR line %d: number of sectors must be within (1-63)", 1142 current_line_number); 1143 status = 0; 1144 } 1145 1146 break; 1147 } 1148 return (status); 1149} 1150 1151 1152static int 1153process_partition(command) 1154 CMD *command; 1155{ 1156 int status = 0, partition; 1157 unsigned long chunks, adj_size, max_end; 1158 struct dos_partition *partp; 1159 1160 while (1) 1161 { 1162 part_processed = 1; 1163 if (command->n_args != 4) 1164 { 1165 warnx("ERROR line %d: incorrect number of partition args", 1166 current_line_number); 1167 break; 1168 } 1169 partition = command->args[0].arg_val; 1170 if (partition < 1 || partition > 4) 1171 { 1172 warnx("ERROR line %d: invalid partition number %d", 1173 current_line_number, partition); 1174 break; 1175 } 1176 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1177 bzero((char *)partp, sizeof (struct dos_partition)); 1178 partp->dp_typ = command->args[1].arg_val; 1179 partp->dp_start = command->args[2].arg_val; 1180 partp->dp_size = command->args[3].arg_val; 1181 max_end = partp->dp_start + partp->dp_size; 1182 1183 if (partp->dp_typ == 0) 1184 { 1185 /* 1186 * Get out, the partition is marked as unused. 1187 */ 1188 /* 1189 * Insure that it's unused. 1190 */ 1191 bzero((char *)partp, sizeof (struct dos_partition)); 1192 status = 1; 1193 break; 1194 } 1195 1196 /* 1197 * Adjust start upwards, if necessary, to fall on an head boundary. 1198 */ 1199 if (partp->dp_start % dos_sectors != 0) 1200 { 1201 adj_size = 1202 (partp->dp_start / dos_sectors + 1) * dos_sectors; 1203 if (adj_size > max_end) 1204 { 1205 /* 1206 * Can't go past end of partition 1207 */ 1208 warnx( 1209 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1210 a cylinder boundary", 1211 current_line_number, partition); 1212 break; 1213 } 1214 warnx( 1215 "WARNING: adjusting start offset of partition '%d' from %lu\n\ 1216 to %lu, to round to an head boundary", 1217 partition, (u_long)partp->dp_start, adj_size); 1218 partp->dp_start = adj_size; 1219 } 1220 1221 /* 1222 * Adjust size downwards, if necessary, to fall on a cylinder 1223 * boundary. 1224 */ 1225 chunks = 1226 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1227 adj_size = chunks - partp->dp_start; 1228 if (adj_size != partp->dp_size) 1229 { 1230 warnx( 1231 "WARNING: adjusting size of partition '%d' from %lu to %lu,\n\ 1232 to round to a cylinder boundary", 1233 partition, (u_long)partp->dp_size, adj_size); 1234 if (chunks > 0) 1235 { 1236 partp->dp_size = adj_size; 1237 } 1238 else 1239 { 1240 partp->dp_size = 0; 1241 } 1242 } 1243 if (partp->dp_size < 1) 1244 { 1245 warnx("ERROR line %d: size for partition '%d' is zero", 1246 current_line_number, partition); 1247 break; 1248 } 1249 1250 dos(partp->dp_start, partp->dp_size, 1251 &partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd); 1252 dos(partp->dp_start+partp->dp_size - 1, partp->dp_size, 1253 &partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd); 1254 status = 1; 1255 break; 1256 } 1257 return (status); 1258} 1259 1260 1261static int 1262process_active(command) 1263 CMD *command; 1264{ 1265 int status = 0, partition, i; 1266 struct dos_partition *partp; 1267 1268 while (1) 1269 { 1270 active_processed = 1; 1271 if (command->n_args != 1) 1272 { 1273 warnx("ERROR line %d: incorrect number of active args", 1274 current_line_number); 1275 status = 0; 1276 break; 1277 } 1278 partition = command->args[0].arg_val; 1279 if (partition < 1 || partition > 4) 1280 { 1281 warnx("ERROR line %d: invalid partition number %d", 1282 current_line_number, partition); 1283 break; 1284 } 1285 /* 1286 * Reset active partition 1287 */ 1288 partp = ((struct dos_partition *) &mboot.parts); 1289 for (i = 0; i < NDOSPART; i++) 1290 partp[i].dp_flag = 0; 1291 partp[partition-1].dp_flag = ACTIVE; 1292 1293 status = 1; 1294 break; 1295 } 1296 return (status); 1297} 1298 1299 1300static int 1301process_line(line) 1302 char *line; 1303{ 1304 CMD command; 1305 int status = 1; 1306 1307 while (1) 1308 { 1309 parse_config_line(line, &command); 1310 switch (command.cmd) 1311 { 1312 case 0: 1313 /* 1314 * Comment or blank line 1315 */ 1316 break; 1317 case 'g': 1318 /* 1319 * Set geometry 1320 */ 1321 status = process_geometry(&command); 1322 break; 1323 case 'p': 1324 status = process_partition(&command); 1325 break; 1326 case 'a': 1327 status = process_active(&command); 1328 break; 1329 default: 1330 status = 0; 1331 break; 1332 } 1333 break; 1334 } 1335 return (status); 1336} 1337 1338 1339static int 1340read_config(config_file) 1341 char *config_file; 1342{ 1343 FILE *fp = NULL; 1344 int status = 1; 1345 char buf[1010]; 1346 1347 while (1) /* dirty trick used to insure one exit point for this 1348 function */ 1349 { 1350 if (strcmp(config_file, "-") != 0) 1351 { 1352 /* 1353 * We're not reading from stdin 1354 */ 1355 if ((fp = fopen(config_file, "r")) == NULL) 1356 { 1357 status = 0; 1358 break; 1359 } 1360 } 1361 else 1362 { 1363 fp = stdin; 1364 } 1365 current_line_number = 0; 1366 while (!feof(fp)) 1367 { 1368 if (fgets(buf, sizeof(buf), fp) == NULL) 1369 { 1370 break; 1371 } 1372 ++current_line_number; 1373 status = process_line(buf); 1374 if (status == 0) 1375 { 1376 break; 1377 } 1378 } 1379 break; 1380 } 1381 if (fp) 1382 { 1383 /* 1384 * It doesn't matter if we're reading from stdin, as we've reached EOF 1385 */ 1386 fclose(fp); 1387 } 1388 return (status); 1389} 1390 1391 1392static void 1393reset_boot(void) 1394{ 1395 int i; 1396 struct dos_partition *partp; 1397 1398 init_boot(); 1399 for (i = 0; i < 4; ++i) 1400 { 1401 partp = ((struct dos_partition *) &mboot.parts) + i; 1402 bzero((char *)partp, sizeof (struct dos_partition)); 1403 } 1404} 1405