fdisk.c revision 1.162
1 /* $NetBSD: fdisk.c,v 1.162 2025/01/03 16:16:14 rillig Exp $ */ 2 3 /* 4 * Mach Operating System 5 * Copyright (c) 1992 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie Mellon 26 * the rights to redistribute these changes. 27 */ 28 29 /* 30 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 31 * Copyright (c) 1989 Robert. V. Baron 32 * Created. 33 */ 34 35 #if HAVE_NBTOOL_CONFIG_H 36 #include "nbtool_config.h" 37 #endif 38 39 #include <sys/cdefs.h> 40 41 #ifndef lint 42 __RCSID("$NetBSD: fdisk.c,v 1.162 2025/01/03 16:16:14 rillig Exp $"); 43 #endif /* not lint */ 44 45 #define MBRPTYPENAMES 46 #include <sys/types.h> 47 #include <sys/param.h> 48 #include <sys/stat.h> 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <paths.h> 54 #include <stdarg.h> 55 #include <stddef.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <vis.h> 61 #include <zlib.h> 62 63 #if !HAVE_NBTOOL_CONFIG_H 64 #include <sys/disklabel.h> 65 #include <sys/disklabel_gpt.h> 66 #include <sys/bootblock.h> 67 #include <sys/ioctl.h> 68 #include <sys/sysctl.h> 69 #include <disktab.h> 70 #include <util.h> 71 #else 72 #include <nbinclude/sys/disklabel.h> 73 #include <nbinclude/sys/disklabel_gpt.h> 74 #include <nbinclude/sys/bootblock.h> 75 #include "../../include/disktab.h" 76 /* We enforce -F, so none of these possibly undefined items can be needed */ 77 #define opendisk(path, fl, buf, buflen, cooked) (-1) 78 #endif /* HAVE_NBTOOL_CONFIG_H */ 79 80 #ifndef DEFAULT_BOOTDIR 81 #define DEFAULT_BOOTDIR "/usr/mdec" 82 #endif 83 84 #define LE_MBR_MAGIC htole16(MBR_MAGIC) 85 #define LE_MBR_BS_MAGIC htole16(MBR_BS_MAGIC) 86 87 #ifdef BOOTSEL 88 89 #define DEFAULT_BOOTCODE "mbr" 90 #define DEFAULT_BOOTSELCODE "mbr_bootsel" 91 #define DEFAULT_BOOTEXTCODE "mbr_ext" 92 93 /* Scan values for the various keys we use, as returned by the BIOS */ 94 #define SCAN_ENTER 0x1c 95 #define SCAN_F1 0x3b 96 #define SCAN_1 0x2 97 98 99 #define MAX_BIOS_DISKS 16 /* Going beyond F12 is hard though! */ 100 101 /* We same the dflt 'boot partition' as a disk block, with some magic values. */ 102 #define DEFAULT_ACTIVE (~(daddr_t)0) 103 #define DEFAULT_DISK(n) (DEFAULT_ACTIVE - MAX_BIOS_DISKS + (n)) 104 105 #endif 106 107 #define GPT_TYPE(offs) ((offs) == GPT_HDR_BLKNO ? "primary" : "secondary") 108 109 #ifndef PRIdaddr 110 #define PRIdaddr PRId64 111 #endif 112 113 #ifndef _PATH_DEFDISK 114 #define _PATH_DEFDISK "/dev/rwd0d" 115 #endif 116 117 static struct { 118 struct mbr_sector *ptn; /* array of pbrs */ 119 daddr_t base; /* first sector of ext. ptn */ 120 daddr_t limit; /* last sector of ext. ptn */ 121 int num_ptn; /* number of contained partitions */ 122 int ptn_id; /* entry in mbr */ 123 int is_corrupt; /* 1 if extended chain illegal */ 124 } ext; 125 126 #define LBUF 100 127 static char lbuf[LBUF]; 128 129 static const char *disk = _PATH_DEFDISK; 130 131 static struct disklabel disklabel; /* disk parameters */ 132 133 static struct mbr_sector mboot; 134 135 static const char *boot_dir = DEFAULT_BOOTDIR; 136 static char *boot_path = NULL; /* name of file we actually opened */ 137 138 #ifdef BOOTSEL 139 #define BOOTSEL_OPTIONS "B" 140 #else 141 #define BOOTSEL_OPTIONS "" 142 #define change_part(e, p, id, st, sz, bm) change__part(e, p, id, st, sz) 143 #endif 144 #define OPTIONS BOOTSEL_OPTIONS "0123FSafgiIluvA:b:c:E:r:s:w:z:" 145 146 /* 147 * Disk geometry and partition alignment. 148 * 149 * Modern disks do not have a fixed geomery and will always give a 'faked' 150 * geometry that matches the ATA standard - max 16 heads and 256 sec/track. 151 * The ATA geometry allows access to 2^28 sectors (as does LBA mode). 152 * 153 * The BIOS calls originally used an 8bit register for cylinder, head and 154 * sector. Later 2 bits were stolen from the sector number and added to 155 * cylinder number. The BIOS will translate this faked geometry either to 156 * the geometry reported by the disk, or do LBA reads (possibly LBA48). 157 * BIOS CHS reads have all sorts of limits, but 2^24 is absolute. 158 * For historic reasons the BIOS geometry is the called the dos geometry! 159 * 160 * If you know the disks real geometry it is usually worth aligning 161 * disk partitions to cylinder boundaries (certainly traditional!). 162 * For 'mbr' disks this has always been done with the BIOS geometry. 163 * The first track (typically 63 sectors) is reserved because the first 164 * sector is used for boot code. Similarly the data partition in an 165 * extended partition will start one track in. If an extended partition 166 * starts at the beginning of the disk you lose 2 tracks. 167 * 168 * However non-magnetic media in particular has physical sectors that are 169 * not the same size as those reported, so has to do read modify write 170 * sequences for misaligned transfers. The alignment of partitions to 171 * cylinder boundaries makes this happen all the time. 172 * 173 * It is thus sensible to align partitions on a sensible sector boundary. 174 * For instance 1MB (2048 sectors). 175 * Common code can do this by using a geometry with 1 head and 2048 176 * sectors per track. 177 */ 178 179 /* Disks reported geometry and overall size from device driver */ 180 static unsigned int cylinders, sectors, heads; 181 static daddr_t disksectors; 182 #define cylindersectors (heads * sectors) 183 184 /* Geometry from the BIOS */ 185 static unsigned int dos_cylinders; 186 static unsigned int dos_heads; 187 static unsigned int dos_sectors; 188 static daddr_t dos_disksectors; 189 #define dos_cylindersectors (dos_heads * dos_sectors) 190 #define dos_totalsectors (dos_heads * dos_sectors * dos_cylinders) 191 192 #define DOSSECT(s,c) (((s) & 0x3f) | (((c) >> 2) & 0xc0)) 193 #define DOSCYL(c) ((c) & 0xff) 194 #define SEC_IN_1M (1024 * 1024 / secsize) 195 #define SEC_TO_MB(sec) ((unsigned int)(((sec) + SEC_IN_1M / 2) / SEC_IN_1M)) 196 #define SEC_TO_CYL(sec) (((sec) + dos_cylindersectors/2) / dos_cylindersectors) 197 198 #define MAXCYL 1024 /* Usual limit is 1023 */ 199 #define MAXHEAD 256 /* Usual limit is 255 */ 200 #define MAXSECTOR 63 201 static int partition = -1; 202 203 /* Alignment of partition, and offset if first sector unusable */ 204 static unsigned int ptn_alignment; /* default dos_cylindersectors */ 205 static unsigned int ptn_0_offset; /* default dos_sectors */ 206 207 static int fd = -1, wfd = -1, *rfd = &fd; 208 static char *disk_file = NULL; 209 210 static int a_flag; /* set active partition */ 211 static int i_flag; /* init bootcode */ 212 static int I_flag; /* ignore errors */ 213 static int u_flag; /* update partition data */ 214 static int v_flag; /* more verbose */ 215 static int sh_flag; /* Output data as shell defines */ 216 static int f_flag; /* force --not interactive */ 217 static int g_flag; /* preserve GPT headers */ 218 static int s_flag; /* set id,offset,size */ 219 static int b_flag; /* Set cyl, heads, secs (as c/h/s) */ 220 static int B_flag; /* Edit/install bootselect code */ 221 static int E_flag; /* extended partition number */ 222 static int b_cyl, b_head, b_sec; /* b_flag values. */ 223 224 #if !HAVE_NBTOOL_CONFIG_H 225 static int F_flag = 0; 226 #else 227 /* Tool - force 'file' mode to avoid unsupported functions and ioctls */ 228 static int F_flag = 1; 229 #endif 230 231 static struct gpt_hdr gpt1, gpt2; /* GUID partition tables */ 232 233 static struct mbr_sector bootcode[8192 / sizeof (struct mbr_sector)]; 234 static ssize_t secsize = 512; /* sector size */ 235 static char *iobuf; /* buffer for non 512 sector I/O */ 236 static int bootsize; /* actual size of bootcode */ 237 static int boot_installed; /* 1 if we've copied code into the mbr */ 238 239 #if defined(USE_DISKLIST) 240 #include <machine/cpu.h> 241 static struct disklist *dl; 242 #endif 243 244 245 #define KNOWN_SYSIDS (sizeof(mbr_ptypes)/sizeof(mbr_ptypes[0])) 246 247 __dead static void usage(void); 248 static void print_s0(int); 249 static void print_part(struct mbr_sector *, int, daddr_t); 250 static void print_mbr_partition(struct mbr_sector *, int, daddr_t, daddr_t, int); 251 static void print_pbr(daddr_t, int, uint8_t); 252 static int is_all_zero(const unsigned char *, size_t); 253 static void printvis(int, const char *, const char *, size_t); 254 static int read_boot(const char *, void *, size_t, int); 255 static void init_sector0(int); 256 static void intuit_translated_geometry(void); 257 static void get_bios_geometry(void); 258 static void get_extended_ptn(void); 259 static void get_ptn_alignmemt(void); 260 #if defined(USE_DISKLIST) 261 static void get_diskname(const char *, char *, size_t); 262 #endif 263 static int change_part(int, int, int, daddr_t, daddr_t, char *); 264 static void print_geometry(void); 265 static int first_active(void); 266 static void change_active(int); 267 static void change_bios_geometry(void); 268 static void dos(int, unsigned char *, unsigned char *, unsigned char *); 269 static int open_disk(int); 270 static ssize_t read_disk(daddr_t, void *); 271 static ssize_t write_disk(daddr_t, void *); 272 static int get_params(void); 273 static int read_s0(daddr_t, struct mbr_sector *); 274 static int write_mbr(void); 275 static int read_gpt(daddr_t, struct gpt_hdr *); 276 static int delete_gpt(struct gpt_hdr *); 277 static int yesno(const char *, ...) __printflike(1, 2); 278 static int64_t decimal(const char *, int64_t, int, int64_t, int64_t); 279 #define DEC_SEC 1 /* asking for a sector number */ 280 #define DEC_RND 2 /* round to end of first track */ 281 #define DEC_RND_0 4 /* convert 0 to size of a track */ 282 #define DEC_RND_DOWN 8 /* subtract 1 track */ 283 #define DEC_RND_DOWN_2 16 /* subtract 2 tracks */ 284 static int ptn_id(const char *, int *); 285 static int type_match(const void *, const void *); 286 static const char *get_type(int); 287 static int get_mapping(int, unsigned int *, unsigned int *, unsigned int *, unsigned long *); 288 #ifdef BOOTSEL 289 static daddr_t configure_bootsel(daddr_t); 290 static void install_bootsel(int); 291 static daddr_t get_default_boot(void); 292 static void set_default_boot(daddr_t); 293 static void string(const char *, int, char *); 294 #endif 295 296 static void 297 initvar_disk(const char **diskp) 298 { 299 #if !HAVE_NBTOOL_CONFIG_H 300 int mib[2]; 301 size_t len; 302 char *root_device; 303 304 mib[0] = CTL_KERN; 305 mib[1] = KERN_ROOT_DEVICE; 306 if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1 || 307 (root_device = malloc(len)) == NULL || 308 sysctl(mib, 2, root_device, &len, NULL, 0) == -1) 309 return; 310 311 *diskp = root_device; 312 #endif /* HAVE_NBTOOL_CONFIG_H */ 313 } 314 315 static int 316 getnum(const char *str, int *num) 317 { 318 char *e; 319 long l; 320 321 errno = 0; 322 l = strtol(str, &e, 0); 323 if (str[0] == '\0' || *e != '\0') 324 return -1; 325 if (errno == ERANGE && (l == LONG_MAX || l == LONG_MIN)) 326 return -1; 327 /* XXX: truncation */ 328 *num = (int)l; 329 return 0; 330 } 331 332 /* [<sysid>][/[<start>][/[<size>][/[<bootmenu>]]]] */ 333 static int 334 parse_s(char *arg, int *csysid, unsigned *cstart, unsigned *csize, 335 char **cbootmenu) 336 { 337 char *ptr; 338 int num; 339 340 if ((ptr = strchr(arg, '/')) != NULL) 341 *ptr++ = '\0'; 342 343 if (*arg) { 344 if (getnum(arg, &num) == -1) 345 return -1; 346 *csysid = num; 347 } 348 if (ptr == NULL) 349 return 0; 350 351 arg = ptr; 352 if ((ptr = strchr(arg, '/')) != NULL) 353 *ptr++ = '\0'; 354 if (*arg) { 355 if (getnum(arg, &num) == -1) 356 return -1; 357 *cstart = num; 358 } 359 if (ptr == NULL) 360 return 0; 361 362 arg = ptr; 363 if ((ptr = strchr(arg, '/')) != NULL) 364 *ptr++ = '\0'; 365 if (*arg) { 366 if (getnum(arg, &num) == -1) 367 return -1; 368 *csize = num; 369 } 370 if (ptr != NULL && *ptr) 371 *cbootmenu = ptr; 372 return 0; 373 } 374 375 int 376 main(int argc, char *argv[]) 377 { 378 struct stat sb; 379 int ch; 380 size_t len; 381 char *cp; 382 int n; 383 #ifdef BOOTSEL 384 daddr_t default_ptn; /* start sector of default ptn */ 385 #endif 386 char *cbootmenu = 0; 387 388 int csysid; /* For the s_flag. */ 389 unsigned int cstart, csize; 390 a_flag = u_flag = sh_flag = f_flag = s_flag = b_flag = 0; 391 i_flag = B_flag = 0; 392 v_flag = 0; 393 E_flag = 0; 394 csysid = -1; 395 cstart = csize = ~0U; 396 while ((ch = getopt(argc, argv, OPTIONS)) != -1) { 397 switch (ch) { 398 case '0': 399 partition = 0; 400 break; 401 case '1': 402 partition = 1; 403 break; 404 case '2': 405 partition = 2; 406 break; 407 case '3': 408 partition = 3; 409 break; 410 case 'E': /* Extended partition number */ 411 E_flag = 1; 412 unsigned long ul = strtoul(optarg, &cp, 0); 413 if (*cp || ul > INT_MAX) 414 errx(1, "Bad partition number -E %s.", optarg); 415 partition = (int)ul; 416 break; 417 #ifdef BOOTSEL 418 case 'B': /* Bootselect parameters */ 419 B_flag = 1; 420 break; 421 #endif 422 case 'F': /* device argument is really a file */ 423 F_flag = 1; 424 break; 425 case 'S': /* Output as shell variables */ 426 sh_flag = 1; 427 break; 428 case 'a': /* Set active partition */ 429 a_flag = 1; 430 break; 431 case 'f': /* Non interactive */ 432 f_flag = 1; 433 break; 434 case 'g': /* Preserve GPT headers */ 435 g_flag = 1; 436 break; 437 case 'i': /* Always update bootcode */ 438 i_flag = 1; 439 break; 440 case 'I': /* Ignore errors */ 441 I_flag = 1; 442 break; 443 case 'l': /* List known partition types */ 444 for (len = 0; len < KNOWN_SYSIDS; len++) 445 printf("%03d %s\n", mbr_ptypes[len].id, 446 mbr_ptypes[len].name); 447 return 0; 448 case 'u': /* Update partition details */ 449 u_flag = 1; 450 break; 451 case 'v': /* Be verbose */ 452 v_flag++; 453 break; 454 case 's': /* Partition details */ 455 s_flag = 1; 456 457 if (parse_s(optarg, &csysid, &cstart, &csize, 458 &cbootmenu) == -1) 459 errx(1, "Bad argument to the -s flag."); 460 break; 461 case 'b': /* BIOS geometry */ 462 b_flag = 1; 463 if (sscanf(optarg, "%d/%d/%d%n", &b_cyl, &b_head, 464 &b_sec, &n) != 3 || optarg[n] != 0) 465 errx(1, "Bad argument to the -b flag."); 466 if (b_cyl > MAXCYL) 467 b_cyl = MAXCYL; 468 break; 469 case 'A': /* Partition alignment[/offset] */ 470 if (sscanf(optarg, "%u%n/%u%n", &ptn_alignment, 471 &n, &ptn_0_offset, &n) < 1 472 || optarg[n] != 0 473 || ptn_0_offset > ptn_alignment) 474 errx(1, "Bad argument to the -A flag."); 475 if (ptn_0_offset == 0) 476 ptn_0_offset = ptn_alignment; 477 break; 478 case 'c': /* file/directory containing boot code */ 479 if (strchr(optarg, '/') != NULL && 480 stat(optarg, &sb) == 0 && 481 (sb.st_mode & S_IFMT) == S_IFDIR) { 482 boot_dir = optarg; 483 break; 484 } 485 bootsize = read_boot(optarg, bootcode, 486 sizeof bootcode, 1); 487 i_flag = 1; 488 break; 489 case 'r': /* read data from disk_file (not raw disk) */ 490 rfd = &wfd; 491 /* FALLTHROUGH */ 492 case 'w': /* write data to disk_file */ 493 disk_file = optarg; 494 break; 495 case 'z': 496 secsize = atoi(optarg); 497 if (secsize <= 512 || (secsize & (secsize - 1)) != 0) 498 errx(EXIT_FAILURE, "Invalid sector size %zd", 499 secsize); 500 break; 501 default: 502 usage(); 503 } 504 } 505 argc -= optind; 506 argv += optind; 507 508 if (sh_flag && (a_flag || i_flag || u_flag || f_flag || s_flag)) 509 usage(); 510 511 if (B_flag && f_flag) { 512 warnx("Bootselector may only be configured interactively"); 513 usage(); 514 } 515 516 if (f_flag && u_flag && !s_flag) { 517 warnx("Partition data not specified"); 518 usage(); 519 } 520 521 if (s_flag && partition == -1) { 522 warnx("-s flag requires a partition selected."); 523 usage(); 524 } 525 526 if (argc > 1) 527 usage(); 528 529 if (argc > 0) 530 disk = argv[0]; 531 else if (!F_flag) { 532 /* Default to boot device */ 533 initvar_disk(&disk); 534 } 535 536 if (!F_flag && stat(disk, &sb) == 0 && S_ISREG(sb.st_mode)) 537 F_flag = 1; 538 539 if (open_disk(B_flag || a_flag || i_flag || u_flag) < 0) 540 exit(1); 541 542 if (secsize > 512) { 543 if ((iobuf = malloc(secsize)) == NULL) 544 err(EXIT_FAILURE, "Cannot allocate %zd buffer", 545 secsize); 546 } 547 548 if (read_s0(0, &mboot)) 549 /* must have been a blank disk */ 550 init_sector0(1); 551 552 read_gpt(GPT_HDR_BLKNO, &gpt1); 553 read_gpt(disksectors - 1, &gpt2); 554 555 if (b_flag) { 556 dos_cylinders = b_cyl; 557 dos_heads = b_head; 558 dos_sectors = b_sec; 559 } else { 560 get_bios_geometry(); 561 } 562 563 if (ptn_alignment == 0) 564 get_ptn_alignmemt(); 565 566 get_extended_ptn(); 567 568 #ifdef BOOTSEL 569 default_ptn = get_default_boot(); 570 #endif 571 572 if (E_flag && !u_flag && partition >= ext.num_ptn) 573 errx(1, "Extended partition %d is not defined.", partition); 574 575 /* Do the update stuff! */ 576 if (u_flag) { 577 if (!f_flag && !b_flag) 578 change_bios_geometry(); 579 580 if (s_flag) 581 change_part(E_flag, partition, csysid, cstart, csize, 582 cbootmenu); 583 else { 584 int part = partition, chg_ext = E_flag, prompt = 1; 585 do { 586 if (prompt) { 587 printf("\n"); 588 print_s0(partition); 589 } 590 if (partition == -1) 591 part = ptn_id( 592 "Which partition do you want to change?", 593 &chg_ext); 594 if (part < 0) 595 break; 596 prompt = change_part(chg_ext, part, 0, 0, 0, 0); 597 } while (partition == -1); 598 } 599 } else { 600 if (!i_flag && !B_flag) { 601 print_geometry(); 602 print_s0(partition); 603 } 604 } 605 606 if (a_flag && !E_flag) 607 change_active(partition); 608 609 #ifdef BOOTSEL 610 if (B_flag || u_flag || i_flag) 611 /* Ensure the mbr code supports this configuration */ 612 install_bootsel(0); 613 if (B_flag) 614 default_ptn = configure_bootsel(default_ptn); 615 set_default_boot(default_ptn); 616 #else 617 if (i_flag) 618 init_sector0(0); 619 #endif 620 621 if (u_flag || a_flag || i_flag || B_flag) { 622 if (!f_flag) { 623 printf("\nWe haven't written the MBR back to disk " 624 "yet. This is your last chance.\n"); 625 if (u_flag) 626 print_s0(-1); 627 if (gpt1.hdr_size != 0 || gpt2.hdr_size != 0) 628 printf("\nWARNING: The disk is carrying " 629 "GUID Partition Tables.\n" 630 " If you continue, " 631 "GPT headers will be deleted.\n\n"); 632 if (yesno("Should we write new partition table?")) { 633 delete_gpt(&gpt1); 634 delete_gpt(&gpt2); 635 write_mbr(); 636 } 637 } else { 638 if (delete_gpt(&gpt1) > 0) 639 warnx("Primary GPT header was deleted"); 640 if (delete_gpt(&gpt2) > 0) 641 warnx("Secondary GPT header was deleted"); 642 write_mbr(); 643 } 644 } 645 646 exit(0); 647 } 648 649 static void 650 usage(void) 651 { 652 int indent = 7 + (int)strlen(getprogname()) + 1; 653 654 (void)fprintf(stderr, "usage: %s [-aBFfgIilSuv] " 655 "[-A ptn_alignment[/ptn_0_offset]] \\\n" 656 "%*s[-b cylinders/heads/sectors] \\\n" 657 "%*s[-0123 | -E num " 658 "[-s [id][/[start][/[size][/bootmenu]]]] \\\n" 659 "%*s[-t disktab] [-T disktype] \\\n" 660 "%*s[-c bootcode] " 661 "[-r|-w file] [-z sectorsize] [device]\n" 662 "\t-a change active partition\n" 663 "\t-f force - not interactive\n" 664 "\t-g preserve existing GPT headers\n" 665 "\t-i initialise MBR code\n" 666 "\t-I ignore errors about no space or overlapping partitions\n" 667 "\t-l list partition types\n" 668 "\t-u update partition data\n" 669 "\t-v verbose output, -v -v more verbose still\n" 670 "\t-B update bootselect options\n" 671 "\t-F treat device as a regular file\n" 672 "\t-S output as shell defines\n" 673 "\t-r and -w access 'file' for non-destructive testing\n", 674 getprogname(), indent, "", indent, "", indent, "", indent, ""); 675 exit(1); 676 } 677 678 static daddr_t 679 ext_offset(int part) 680 { 681 daddr_t offset = ext.base; 682 683 if (part != 0) 684 offset += le32toh(ext.ptn[part - 1].mbr_parts[1].mbrp_start); 685 return offset; 686 } 687 688 static void 689 print_s0(int which) 690 { 691 int part; 692 693 if (which == -1) { 694 if (!sh_flag) 695 printf("Partition table:\n"); 696 for (part = 0; part < MBR_PART_COUNT; part++) { 697 if (!sh_flag) 698 printf("%d: ", part); 699 print_part(&mboot, part, 0); 700 } 701 if (!sh_flag) { 702 if (ext.is_corrupt) 703 printf("Extended partition table is corrupt\n"); 704 else 705 if (ext.num_ptn != 0) 706 printf("Extended partition table:\n"); 707 } 708 for (part = 0; part < ext.num_ptn; part++) { 709 if (!sh_flag) 710 printf("E%d: ", part); 711 print_part(&ext.ptn[part], 0, ext_offset(part)); 712 if (!sh_flag && v_flag >= 2) { 713 printf("link: "); 714 print_mbr_partition(&ext.ptn[part], 1, 715 ext_offset(part), ext.base, 0); 716 } 717 } 718 #ifdef BOOTSEL 719 if (!sh_flag && mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 720 int tmo; 721 722 printf("Bootselector "); 723 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ACTIVE) { 724 printf("enabled"); 725 tmo = le16toh(mboot.mbr_bootsel.mbrbs_timeo); 726 if (tmo == 0xffff) 727 printf(", infinite timeout"); 728 else 729 printf(", timeout %d seconds", 730 (10 * tmo + 9) / 182); 731 } else 732 printf("disabled"); 733 printf(".\n"); 734 } 735 #endif 736 if (!sh_flag) { 737 int active = first_active(); 738 if (active == MBR_PART_COUNT) 739 printf("No active partition.\n"); 740 else 741 printf("First active partition: %d\n", active); 742 } 743 if (!sh_flag) 744 printf("Drive serial number: %"PRIu32" (0x%08x)\n", 745 le32toh(mboot.mbr_dsn), 746 le32toh(mboot.mbr_dsn)); 747 return; 748 } 749 750 if (E_flag) { 751 if (!sh_flag) 752 printf("Extended partition E%d:\n", which); 753 if (which > ext.num_ptn) 754 printf("Undefined\n"); 755 else 756 print_part(&ext.ptn[which], 0, ext_offset(which)); 757 } else { 758 if (!sh_flag) 759 printf("Partition %d:\n", which); 760 print_part(&mboot, which, 0); 761 } 762 } 763 764 static void 765 print_part(struct mbr_sector *boot, int part, daddr_t offset) 766 { 767 struct mbr_partition *partp; 768 const char *e; 769 770 if (!sh_flag) { 771 print_mbr_partition(boot, part, offset, 0, 0); 772 return; 773 } 774 775 partp = &boot->mbr_parts[part]; 776 if (boot != &mboot) { 777 part = boot - ext.ptn; 778 e = "E"; 779 } else 780 e = ""; 781 782 if (partp->mbrp_type == 0) { 783 printf("PART%s%dSIZE=0\n", e, part); 784 return; 785 } 786 787 printf("PART%s%dID=%d\n", e, part, partp->mbrp_type); 788 printf("PART%s%dSIZE=%u\n", e, part, le32toh(partp->mbrp_size)); 789 printf("PART%s%dSTART=%"PRIdaddr"\n", e, part, 790 offset + le32toh(partp->mbrp_start)); 791 printf("PART%s%dFLAG=0x%x\n", e, part, partp->mbrp_flag); 792 printf("PART%s%dBCYL=%d\n", e, part, 793 MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect)); 794 printf("PART%s%dBHEAD=%d\n", e, part, partp->mbrp_shd); 795 printf("PART%s%dBSEC=%d\n", e, part, MBR_PSECT(partp->mbrp_ssect)); 796 printf("PART%s%dECYL=%d\n", e, part, 797 MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect)); 798 printf("PART%s%dEHEAD=%d\n", e, part, partp->mbrp_ehd); 799 printf("PART%s%dESEC=%d\n", e, part, MBR_PSECT(partp->mbrp_esect)); 800 } 801 802 static void 803 pr_cyls(daddr_t sector, int is_end) 804 { 805 unsigned long cyl, head, sect; 806 cyl = sector / dos_cylindersectors; 807 sect = sector - cyl * dos_cylindersectors; 808 head = sect / dos_sectors; 809 sect -= head * dos_sectors; 810 811 printf("%lu", cyl); 812 813 if (is_end) { 814 if (head == dos_heads - 1 && sect == dos_sectors - 1) 815 return; 816 } else { 817 if (head == 0 && sect == 0) 818 return; 819 } 820 821 printf("/%lu/%lu", head, sect + 1); 822 } 823 824 static void 825 print_mbr_partition(struct mbr_sector *boot, int part, 826 daddr_t offset, daddr_t exoffset, int indent) 827 { 828 daddr_t start; 829 daddr_t size; 830 struct mbr_partition *partp = &boot->mbr_parts[part]; 831 struct mbr_sector eboot; 832 int p; 833 static int dumped = 0; 834 835 if (partp->mbrp_type == 0 && v_flag < 2) { 836 printf("<UNUSED>\n"); 837 return; 838 } 839 840 start = le32toh(partp->mbrp_start); 841 size = le32toh(partp->mbrp_size); 842 if (MBR_IS_EXTENDED(partp->mbrp_type)) 843 start += exoffset; 844 else 845 start += offset; 846 847 printf("%s (sysid %d)\n", get_type(partp->mbrp_type), partp->mbrp_type); 848 #ifdef BOOTSEL 849 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC && 850 boot->mbr_bootsel.mbrbs_nametab[part][0]) 851 printf("%*s bootmenu: %s\n", indent, "", 852 boot->mbr_bootsel.mbrbs_nametab[part]); 853 #endif 854 855 printf("%*s start %"PRIdaddr", size %"PRIdaddr, 856 indent, "", start, size); 857 if (size != 0) { 858 printf(" (%u MB, Cyls ", SEC_TO_MB(size)); 859 if (v_flag == 0 && le32toh(partp->mbrp_start) == ptn_0_offset) 860 pr_cyls(start - ptn_0_offset, 0); 861 else 862 pr_cyls(start, 0); 863 printf("-"); 864 pr_cyls(start + size - 1, 1); 865 printf(")"); 866 } 867 868 switch (partp->mbrp_flag) { 869 case 0: 870 break; 871 case MBR_PFLAG_ACTIVE: 872 printf(", Active"); 873 break; 874 default: 875 printf(", flag 0x%x", partp->mbrp_flag); 876 break; 877 } 878 printf("\n"); 879 880 if (v_flag) { 881 printf("%*s beg: cylinder %4d, head %3d, sector %2d\n", 882 indent, "", 883 MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect), 884 partp->mbrp_shd, MBR_PSECT(partp->mbrp_ssect)); 885 printf("%*s end: cylinder %4d, head %3d, sector %2d\n", 886 indent, "", 887 MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect), 888 partp->mbrp_ehd, MBR_PSECT(partp->mbrp_esect)); 889 } 890 891 if (partp->mbrp_type == 0 && start == 0 && v_flag < 3) 892 return; 893 894 if (! MBR_IS_EXTENDED(partp->mbrp_type)) 895 print_pbr(start, indent + 8, partp->mbrp_type); 896 897 if (!MBR_IS_EXTENDED(partp->mbrp_type) || 898 (v_flag <= 2 && !ext.is_corrupt)) 899 return; 900 901 /* 902 * Recursive dump extended table, 903 * This is read from the disk - so is wrong during editing. 904 * Just ensure we only show it once. 905 */ 906 if (dumped) 907 return; 908 909 printf("%*s Extended partition table:\n", indent, ""); 910 indent += 4; 911 if (read_s0(start, &eboot) == -1) 912 return; 913 for (p = 0; p < MBR_PART_COUNT; p++) { 914 printf("%*s%d: ", indent, "", p); 915 print_mbr_partition(&eboot, p, start, 916 exoffset ? exoffset : start, indent); 917 } 918 919 if (exoffset == 0) 920 dumped = 1; 921 } 922 923 /* Print a line with a label and a vis-encoded string */ 924 static void 925 printvis(int indent, const char *label, const char *buf, size_t size) 926 { 927 char *visbuf; 928 929 if ((visbuf = malloc(size * 4 + 1)) == NULL) 930 err(1, "Malloc failed"); 931 strsvisx(visbuf, buf, size, VIS_TAB|VIS_NL|VIS_OCTAL, "\""); 932 printf("%*s%s: \"%s\"\n", 933 indent, "", 934 label, visbuf); 935 free(visbuf); 936 } 937 938 /* Check whether a buffer contains all bytes zero */ 939 static int 940 is_all_zero(const unsigned char *p, size_t size) 941 { 942 943 while (size-- > 0) { 944 if (*p++ != 0) 945 return 0; 946 } 947 return 1; 948 } 949 950 /* 951 * Report on the contents of a PBR sector. 952 * 953 * We first perform several sanity checks. If vflag >= 2, we report all 954 * failing tests, but for smaller values of v_flag we stop after the 955 * first failing test. Tests are ordered in an attempt to get the most 956 * useful error message from the first failing test. 957 * 958 * If v_flag >= 2, we also report some decoded values from the PBR. 959 * These results may be meaningless, if the PBR doesn't follow common 960 * conventions. 961 * 962 * Trying to decode anything more than the magic number in the last 963 * two bytes is a layering violation, but it can be very useful in 964 * diagnosing boot failures. 965 */ 966 static void 967 print_pbr(daddr_t sector, int indent, uint8_t part_type __unused) 968 { 969 struct mbr_sector pboot; 970 unsigned char *p, *endp; 971 unsigned char val; 972 int ok; 973 int errcount = 0; 974 975 #define PBR_ERROR(...) \ 976 do { \ 977 ++errcount; \ 978 printf("%*s%s: ", indent, "", \ 979 (v_flag < 2 ? "PBR is not bootable" : "Not bootable")); \ 980 printf(__VA_ARGS__); \ 981 if (v_flag < 2) \ 982 return; \ 983 } while (/*CONSTCOND*/ 0) 984 985 if (v_flag >= 2) { 986 printf("%*sInformation from PBR:\n", 987 indent, ""); 988 indent += 4; 989 } 990 991 if (read_disk(sector, &pboot) == -1) { 992 PBR_ERROR("Sector %"PRIdaddr" is unreadable (%s)\n", 993 sector, strerror(errno)); 994 return; 995 } 996 997 /* all bytes identical? */ 998 p = (unsigned char *)&pboot; 999 endp = p + sizeof(pboot); 1000 val = *p; 1001 ok = 0; 1002 for (; p < endp; p++) { 1003 if (*p != val) { 1004 ok = 1; 1005 break; 1006 } 1007 } 1008 if (! ok) 1009 PBR_ERROR("All bytes are identical (0x%02x)\n", val); 1010 1011 if (pboot.mbr_magic != LE_MBR_MAGIC) 1012 PBR_ERROR("Bad magic number (0x%04x)\n", 1013 le16toh(pboot.mbr_magic)); 1014 1015 #if 0 1016 /* Some i386 OS might fail this test. All non-i386 will fail. */ 1017 if (pboot.mbr_jmpboot[0] != 0xE9 1018 && pboot.mbr_jmpboot[0] != 0xEB) { 1019 PBR_ERROR("Does not begin with i386 JMP instruction" 1020 " (0x%02x 0x%02x0 0x%02x)\n", 1021 pboot.mbr_jmpboot[0], pboot.mbr_jmpboot[1], 1022 pboot.mbr_jmpboot[2]); 1023 } 1024 #endif 1025 1026 if (v_flag > 0 && errcount == 0) 1027 printf("%*sPBR appears to be bootable\n", 1028 indent, ""); 1029 if (v_flag < 2) 1030 return; 1031 1032 if (! is_all_zero(pboot.mbr_oemname, sizeof(pboot.mbr_oemname))) { 1033 printvis(indent, "OEM name", (char *)pboot.mbr_oemname, 1034 sizeof(pboot.mbr_oemname)); 1035 } 1036 1037 if (pboot.mbr_bpb.bpb16.bsBootSig == 0x29) 1038 printf("%*sBPB FAT16 boot signature found\n", 1039 indent, ""); 1040 if (pboot.mbr_bpb.bpb32.bsBootSig == 0x29) 1041 printf("%*sBPB FAT32 boot signature found\n", 1042 indent, ""); 1043 1044 #undef PBR_ERROR 1045 } 1046 1047 static int 1048 read_boot(const char *name, void *buf, size_t len, int err_exit) 1049 { 1050 int bfd, ret; 1051 struct stat st; 1052 1053 if (boot_path != NULL) 1054 free(boot_path); 1055 if (strchr(name, '/') == 0) 1056 asprintf(&boot_path, "%s/%s", boot_dir, name); 1057 else 1058 boot_path = strdup(name); 1059 if (boot_path == NULL) 1060 err(1, "Malloc failed"); 1061 1062 if ((bfd = open(boot_path, O_RDONLY)) < 0 || fstat(bfd, &st) == -1) { 1063 warn("%s", boot_path); 1064 goto fail; 1065 } 1066 1067 if (st.st_size > (off_t)len) { 1068 warnx("%s: bootcode too large", boot_path); 1069 goto fail; 1070 } 1071 ret = st.st_size; 1072 if (ret < 0x200) { 1073 warnx("%s: bootcode too small", boot_path); 1074 goto fail; 1075 } 1076 if (read(bfd, buf, len) != ret) { 1077 warn("%s", boot_path); 1078 goto fail; 1079 } 1080 1081 if (((struct mbr_sector *)buf)->mbr_magic != LE_MBR_MAGIC) { 1082 warnx("%s: invalid magic", boot_path); 1083 goto fail; 1084 } 1085 1086 close(bfd); 1087 ret = (ret + 0x1ff) & ~0x1ff; 1088 return ret; 1089 1090 fail: 1091 if (bfd >= 0) 1092 close(bfd); 1093 if (err_exit) 1094 exit(1); 1095 return 0; 1096 } 1097 1098 static void 1099 init_sector0(int zappart) 1100 { 1101 int i; 1102 int copy_size = offsetof(struct mbr_sector, mbr_dsn); 1103 1104 #ifdef DEFAULT_BOOTCODE 1105 if (bootsize == 0) 1106 bootsize = read_boot(DEFAULT_BOOTCODE, bootcode, 1107 sizeof bootcode, 0); 1108 #endif 1109 #ifdef BOOTSEL 1110 if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC 1111 && bootcode[0].mbr_bootsel_magic == LE_MBR_BS_MAGIC) 1112 copy_size = MBR_BS_OFFSET; 1113 #endif 1114 1115 if (bootsize != 0) { 1116 boot_installed = 1; 1117 memcpy(&mboot, bootcode, copy_size); 1118 mboot.mbr_bootsel_magic = bootcode[0].mbr_bootsel_magic; 1119 } 1120 mboot.mbr_magic = LE_MBR_MAGIC; 1121 1122 if (!zappart) 1123 return; 1124 for (i = 0; i < MBR_PART_COUNT; i++) 1125 memset(&mboot.mbr_parts[i], 0, sizeof(mboot.mbr_parts[i])); 1126 } 1127 1128 static void 1129 get_extended_ptn(void) 1130 { 1131 struct mbr_partition *mp; 1132 struct mbr_sector *boot; 1133 daddr_t offset; 1134 1135 /* find first (there should only be one) extended partition */ 1136 for (mp = mboot.mbr_parts; !MBR_IS_EXTENDED(mp->mbrp_type); mp++) 1137 if (mp >= &mboot.mbr_parts[MBR_PART_COUNT]) 1138 return; 1139 1140 /* 1141 * The extended partition should be structured as a linked list 1142 * (even though it appears, at first glance, to be a tree). 1143 */ 1144 ext.base = le32toh(mp->mbrp_start); 1145 ext.limit = ext.base + le32toh(mp->mbrp_size); 1146 ext.ptn_id = mp - mboot.mbr_parts; 1147 for (offset = 0;; offset = le32toh(boot->mbr_parts[1].mbrp_start)) { 1148 if (reallocarr(&ext.ptn, 1149 ext.num_ptn + 1, sizeof(*ext.ptn)) != 0) 1150 err(1, "Malloc failed"); 1151 boot = ext.ptn + ext.num_ptn; 1152 if (read_s0(offset + ext.base, boot) == -1) 1153 break; 1154 /* expect p0 to be valid and p1 to be another extended ptn */ 1155 if (MBR_IS_EXTENDED(boot->mbr_parts[0].mbrp_type)) 1156 break; 1157 if (boot->mbr_parts[1].mbrp_type != 0 && 1158 !MBR_IS_EXTENDED(boot->mbr_parts[1].mbrp_type)) 1159 break; 1160 /* p2 and p3 should be unallocated */ 1161 if (boot->mbr_parts[2].mbrp_type != 0 || 1162 boot->mbr_parts[3].mbrp_type != 0) 1163 break; 1164 /* data ptn inside extended one */ 1165 if (boot->mbr_parts[0].mbrp_type != 0 && 1166 offset + le32toh(boot->mbr_parts[0].mbrp_start) 1167 + le32toh(boot->mbr_parts[0].mbrp_size) > ext.limit) 1168 break; 1169 1170 ext.num_ptn++; 1171 1172 if (boot->mbr_parts[1].mbrp_type == 0) 1173 /* end of extended partition chain */ 1174 return; 1175 /* must be in sector order */ 1176 if (offset >= le32toh(boot->mbr_parts[1].mbrp_start)) 1177 break; 1178 } 1179 1180 warnx("Extended partition table is corrupt"); 1181 ext.is_corrupt = 1; 1182 ext.num_ptn = 0; 1183 } 1184 1185 #if defined(USE_DISKLIST) 1186 static void 1187 get_diskname(const char *fullname, char *diskname, size_t size) 1188 { 1189 const char *p, *p2; 1190 size_t len; 1191 1192 p = strrchr(fullname, '/'); 1193 if (p == NULL) 1194 p = fullname; 1195 else 1196 p++; 1197 1198 if (*p == 0) { 1199 strlcpy(diskname, fullname, size); 1200 return; 1201 } 1202 1203 if (*p == 'r') 1204 p++; 1205 1206 for (p2 = p; *p2 != 0; p2++) 1207 if (isdigit((unsigned char)*p2)) 1208 break; 1209 if (*p2 == 0) { 1210 /* XXX invalid diskname? */ 1211 strlcpy(diskname, fullname, size); 1212 return; 1213 } 1214 while (isdigit((unsigned char)*p2)) 1215 p2++; 1216 1217 len = p2 - p; 1218 if (len > size) { 1219 /* XXX */ 1220 strlcpy(diskname, fullname, size); 1221 return; 1222 } 1223 1224 memcpy(diskname, p, len); 1225 diskname[len] = 0; 1226 } 1227 #endif 1228 1229 static void 1230 get_ptn_alignmemt(void) 1231 { 1232 struct mbr_partition *partp = &mboot.mbr_parts[0]; 1233 uint32_t ptn_0_base, ptn_0_limit; 1234 1235 /* Default to using 'traditional' cylinder alignment */ 1236 ptn_alignment = dos_cylindersectors; 1237 ptn_0_offset = dos_sectors; 1238 1239 if (partp->mbrp_type != 0) { 1240 /* Try to copy alignment of first partition */ 1241 ptn_0_base = le32toh(partp->mbrp_start); 1242 ptn_0_limit = ptn_0_base + le32toh(partp->mbrp_size); 1243 if (!(ptn_0_limit & 2047)) { 1244 /* Partition ends on a 1MB boundary, align to 1MB */ 1245 ptn_alignment = 2048; 1246 if (ptn_0_base <= 2048 1247 && !(ptn_0_base & (ptn_0_base - 1))) { 1248 /* ptn_base is a power of 2, use it */ 1249 ptn_0_offset = ptn_0_base; 1250 } 1251 } 1252 } else { 1253 /* Use 1MB alignment for large disks */ 1254 if (disksectors > 2048 * 1024 * 128) { 1255 ptn_alignment = 2048; 1256 ptn_0_offset = 2048; 1257 } 1258 } 1259 } 1260 1261 static void 1262 get_bios_geometry(void) 1263 { 1264 #if defined(USE_DISKLIST) 1265 int mib[2], i; 1266 size_t len; 1267 struct biosdisk_info *bip; 1268 struct nativedisk_info *nip; 1269 char diskname[8]; 1270 1271 mib[0] = CTL_MACHDEP; 1272 mib[1] = CPU_DISKINFO; 1273 if (sysctl(mib, 2, NULL, &len, NULL, 0) < 0) { 1274 goto out; 1275 } 1276 dl = (struct disklist *) malloc(len); 1277 if (dl == NULL) 1278 err(1, "Malloc failed"); 1279 if (sysctl(mib, 2, dl, &len, NULL, 0) < 0) { 1280 free(dl); 1281 dl = 0; 1282 goto out; 1283 } 1284 1285 get_diskname(disk, diskname, sizeof diskname); 1286 1287 for (i = 0; i < dl->dl_nnativedisks; i++) { 1288 nip = &dl->dl_nativedisks[i]; 1289 if (strcmp(diskname, nip->ni_devname)) 1290 continue; 1291 /* 1292 * XXX listing possible matches is better. This is ok for 1293 * now because the user has a chance to change it later. 1294 * Also, if all the disks have the same parameters then we can 1295 * just use them, we don't need to know which disk is which. 1296 */ 1297 if (nip->ni_nmatches != 0) { 1298 bip = &dl->dl_biosdisks[nip->ni_biosmatches[0]]; 1299 dos_cylinders = bip->bi_cyl; 1300 dos_heads = bip->bi_head; 1301 dos_sectors = bip->bi_sec; 1302 if (bip->bi_lbasecs) 1303 dos_disksectors = bip->bi_lbasecs; 1304 return; 1305 } 1306 } 1307 out: 1308 #endif 1309 /* Allright, allright, make a stupid guess.. */ 1310 intuit_translated_geometry(); 1311 } 1312 1313 #ifdef BOOTSEL 1314 static daddr_t 1315 get_default_boot(void) 1316 { 1317 unsigned int id; 1318 int p; 1319 1320 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1321 /* default to first active partition */ 1322 return DEFAULT_ACTIVE; 1323 1324 id = mboot.mbr_bootsel.mbrbs_defkey; 1325 1326 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII) { 1327 /* Keycode is ascii */ 1328 if (id == '\r') 1329 return DEFAULT_ACTIVE; 1330 /* '1'+ => allocated partition id, 'a'+ => disk 0+ */ 1331 if (id >= 'a' && id < 'a' + MAX_BIOS_DISKS) 1332 return DEFAULT_DISK(id - 'a'); 1333 id -= '1'; 1334 } else { 1335 /* keycode is PS/2 keycode */ 1336 if (id == SCAN_ENTER) 1337 return DEFAULT_ACTIVE; 1338 /* 1+ => allocated partition id, F1+ => disk 0+ */ 1339 if (id >= SCAN_F1 && id < SCAN_F1 + MAX_BIOS_DISKS) 1340 return DEFAULT_DISK(id - SCAN_F1); 1341 id -= SCAN_1; 1342 } 1343 1344 /* Convert partition index to the invariant start sector number */ 1345 1346 for (p = 0; p < MBR_PART_COUNT; p++) { 1347 if (mboot.mbr_parts[p].mbrp_type == 0) 1348 continue; 1349 if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0) 1350 continue; 1351 if (id-- == 0) 1352 return le32toh(mboot.mbr_parts[p].mbrp_start); 1353 } 1354 1355 for (p = 0; p < ext.num_ptn; p++) { 1356 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1357 continue; 1358 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1359 continue; 1360 if (id-- == 0) 1361 return ext_offset(p) 1362 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start); 1363 } 1364 1365 return DEFAULT_ACTIVE; 1366 } 1367 1368 static void 1369 set_default_boot(daddr_t default_ptn) 1370 { 1371 int p; 1372 static const unsigned char key_list[] = { SCAN_ENTER, SCAN_F1, SCAN_1, 1373 '\r', 'a', '1' }; 1374 const unsigned char *key = key_list; 1375 1376 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1377 /* sanity */ 1378 return; 1379 1380 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII) 1381 /* Use ascii values */ 1382 key += 3; 1383 1384 if (default_ptn == DEFAULT_ACTIVE) { 1385 mboot.mbr_bootsel.mbrbs_defkey = key[0]; 1386 return; 1387 } 1388 1389 if (default_ptn >= DEFAULT_DISK(0) 1390 && default_ptn < DEFAULT_DISK(MAX_BIOS_DISKS)) { 1391 mboot.mbr_bootsel.mbrbs_defkey = key[1] 1392 + default_ptn - DEFAULT_DISK(0); 1393 return; 1394 } 1395 1396 mboot.mbr_bootsel.mbrbs_defkey = key[2]; 1397 for (p = 0; p < MBR_PART_COUNT; p++) { 1398 if (mboot.mbr_parts[p].mbrp_type == 0) 1399 continue; 1400 if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0) 1401 continue; 1402 if (le32toh(mboot.mbr_parts[p].mbrp_start) == default_ptn) 1403 return; 1404 mboot.mbr_bootsel.mbrbs_defkey++; 1405 } 1406 1407 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_EXTLBA) { 1408 for (p = 0; p < ext.num_ptn; p++) { 1409 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1410 continue; 1411 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1412 continue; 1413 if (le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) + 1414 ext_offset(p) == default_ptn) 1415 return; 1416 mboot.mbr_bootsel.mbrbs_defkey++; 1417 } 1418 } 1419 1420 /* Default to first active partition */ 1421 mboot.mbr_bootsel.mbrbs_defkey = key[0]; 1422 } 1423 1424 static void 1425 install_bootsel(int needed) 1426 { 1427 struct mbr_bootsel *mbs = &mboot.mbr_bootsel; 1428 int p; 1429 int ext13 = 0; 1430 const char *code; 1431 1432 needed |= MBR_BS_NEWMBR; /* need new bootsel code */ 1433 1434 /* Work out which boot code we need for this configuration */ 1435 for (p = 0; p < MBR_PART_COUNT; p++) { 1436 if (mboot.mbr_parts[p].mbrp_type == 0) 1437 continue; 1438 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1439 break; 1440 if (mbs->mbrbs_nametab[p][0] == 0) 1441 continue; 1442 needed |= MBR_BS_ACTIVE; 1443 if (le32toh(mboot.mbr_parts[p].mbrp_start) >= dos_totalsectors) 1444 ext13 = MBR_BS_EXTINT13; 1445 } 1446 1447 for (p = 0; p < ext.num_ptn; p++) { 1448 if (ext.ptn[p].mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1449 continue; 1450 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1451 continue; 1452 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[p][0] == 0) 1453 continue; 1454 needed |= MBR_BS_EXTLBA | MBR_BS_ACTIVE; 1455 } 1456 1457 if (B_flag) 1458 needed |= MBR_BS_ACTIVE; 1459 1460 /* Is the installed code good enough ? */ 1461 if (!i_flag && (needed == 0 || 1462 (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC 1463 && (mbs->mbrbs_flags & needed) == needed))) { 1464 /* yes - just set flags */ 1465 mbs->mbrbs_flags |= ext13; 1466 return; 1467 } 1468 1469 /* ok - we need to replace the bootcode */ 1470 1471 if (f_flag && !(i_flag || B_flag)) { 1472 warnx("Installed bootfile doesn't support required options."); 1473 return; 1474 } 1475 1476 if (!f_flag && bootsize == 0 && !i_flag) 1477 /* Output an explanation for the 'update bootcode' prompt. */ 1478 printf("\n%s\n", 1479 "Installed bootfile doesn't support required options."); 1480 1481 /* Were we told a specific file ? (which we have already read) */ 1482 /* If so check that it supports what we need. */ 1483 if (bootsize != 0 && needed != 0 1484 && (bootcode[0].mbr_bootsel_magic != LE_MBR_BS_MAGIC 1485 || ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed))) { 1486 /* No it doesn't... */ 1487 if (f_flag) 1488 warnx("Bootfile %s doesn't support " 1489 "required bootsel options", boot_path ); 1490 /* But install it anyway */ 1491 else 1492 if (yesno("Bootfile %s doesn't support the required " 1493 "options,\ninstall default bootfile instead?", 1494 boot_path)) 1495 bootsize = 0; 1496 } 1497 1498 if (bootsize == 0) { 1499 /* Get name of bootfile that supports the required facilities */ 1500 code = DEFAULT_BOOTCODE; 1501 if (needed & MBR_BS_ACTIVE) 1502 code = DEFAULT_BOOTSELCODE; 1503 #ifdef DEFAULT_BOOTEXTCODE 1504 if (needed & MBR_BS_EXTLBA) 1505 code = DEFAULT_BOOTEXTCODE; 1506 #endif 1507 1508 bootsize = read_boot(code, bootcode, sizeof bootcode, 0); 1509 if (bootsize == 0) 1510 /* The old bootcode is better than no bootcode at all */ 1511 return; 1512 if ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed) 1513 warnx("Default bootfile %s doesn't support required " 1514 "options. Got flags 0x%x, wanted 0x%x\n", 1515 boot_path, bootcode[0].mbr_bootsel.mbrbs_flags, 1516 needed); 1517 } 1518 1519 if (!f_flag && !yesno("Update the bootcode from %s?", boot_path)) 1520 return; 1521 1522 init_sector0(0); 1523 1524 if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC) 1525 mbs->mbrbs_flags = bootcode[0].mbr_bootsel.mbrbs_flags | ext13; 1526 } 1527 1528 static daddr_t 1529 configure_bootsel(daddr_t default_ptn) 1530 { 1531 struct mbr_bootsel *mbs = &mboot.mbr_bootsel; 1532 int i, item, opt; 1533 int tmo; 1534 daddr_t *off; 1535 int num_bios_disks; 1536 1537 #if defined(USE_DISKLIST) 1538 if (dl != NULL) { 1539 num_bios_disks = dl->dl_nbiosdisks; 1540 if (num_bios_disks > MAX_BIOS_DISKS) 1541 num_bios_disks = MAX_BIOS_DISKS; 1542 } else 1543 #endif 1544 num_bios_disks = MAX_BIOS_DISKS; 1545 1546 printf("\nBoot selector configuration:\n"); 1547 1548 /* The timeout value is in ticks, ~18.2 Hz. Avoid using floats. 1549 * Ticks are nearly 64k/3600 - so our long timers are sligtly out! 1550 * Newer bootcode always waits for 1 tick, so treats 0xffff 1551 * as wait forever. 1552 */ 1553 tmo = le16toh(mbs->mbrbs_timeo); 1554 tmo = tmo == 0xffff ? -1 : (10 * tmo + 9) / 182; 1555 tmo = decimal("Timeout value (0 to 3600 seconds, -1 => never)", 1556 tmo, 0, -1, 3600); 1557 mbs->mbrbs_timeo = htole16(tmo == -1 ? 0xffff : (tmo * 182) / 10); 1558 1559 off = calloc(1 + MBR_PART_COUNT + ext.num_ptn + num_bios_disks, sizeof *off); 1560 if (off == NULL) 1561 err(1, "Malloc failed"); 1562 1563 printf("Select the default boot option. Options are:\n\n"); 1564 item = 0; 1565 opt = 0; 1566 off[opt] = DEFAULT_ACTIVE; 1567 printf("%d: The first active partition\n", opt); 1568 for (i = 0; i < MBR_PART_COUNT; i++) { 1569 if (mboot.mbr_parts[i].mbrp_type == 0) 1570 continue; 1571 if (mbs->mbrbs_nametab[i][0] == 0) 1572 continue; 1573 printf("%d: %s\n", ++opt, &mbs->mbrbs_nametab[i][0]); 1574 off[opt] = le32toh(mboot.mbr_parts[i].mbrp_start); 1575 if (off[opt] == default_ptn) 1576 item = opt; 1577 } 1578 if (mbs->mbrbs_flags & MBR_BS_EXTLBA) { 1579 for (i = 0; i < ext.num_ptn; i++) { 1580 if (ext.ptn[i].mbr_parts[0].mbrp_type == 0) 1581 continue; 1582 if (ext.ptn[i].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1583 continue; 1584 printf("%d: %s\n", 1585 ++opt, ext.ptn[i].mbr_bootsel.mbrbs_nametab[0]); 1586 off[opt] = ext_offset(i) + 1587 le32toh(ext.ptn[i].mbr_parts[0].mbrp_start); 1588 if (off[opt] == default_ptn) 1589 item = opt; 1590 } 1591 } 1592 for (i = 0; i < num_bios_disks; i++) { 1593 printf("%d: Harddisk %d\n", ++opt, i); 1594 off[opt] = DEFAULT_DISK(i); 1595 if (DEFAULT_DISK(i) == default_ptn) 1596 item = opt; 1597 } 1598 1599 item = decimal("Default boot option", item, 0, 0, opt); 1600 1601 default_ptn = off[item]; 1602 free(off); 1603 return default_ptn; 1604 } 1605 #endif /* BOOTSEL */ 1606 1607 1608 /* Prerequisite: the disklabel parameters and master boot record must 1609 * have been read (i.e. dos_* and mboot are meaningful). 1610 * Specification: modifies dos_cylinders, dos_heads, dos_sectors, and 1611 * dos_cylindersectors to be consistent with what the 1612 * partition table is using, if we can find a geometry 1613 * which is consistent with all partition table entries. 1614 * We may get the number of cylinders slightly wrong (in 1615 * the conservative direction). The idea is to be able 1616 * to create a NetBSD partition on a disk we don't know 1617 * the translated geometry of. 1618 * This routine is only used for non-x86 systems or when we fail to 1619 * get the BIOS geometry from the kernel. 1620 */ 1621 static void 1622 intuit_translated_geometry(void) 1623 { 1624 uint32_t xcylinders; 1625 int xheads = -1, xsectors = -1, i, j; 1626 unsigned int c1, h1, s1, c2, h2, s2; 1627 unsigned long a1, a2; 1628 uint64_t num, denom; 1629 1630 /* 1631 * The physical parameters may be invalid as bios geometry. 1632 * If we cannot determine the actual bios geometry, we are 1633 * better off picking a likely 'faked' geometry than leaving 1634 * the invalid physical one. 1635 */ 1636 1637 if (dos_cylinders > MAXCYL || dos_heads > MAXHEAD || 1638 dos_sectors > MAXSECTOR) { 1639 h1 = MAXHEAD - 1; 1640 c1 = MAXCYL - 1; 1641 #if defined(USE_DISKLIST) 1642 if (dl != NULL) { 1643 /* BIOS may use 256 heads or 1024 cylinders */ 1644 for (i = 0; i < dl->dl_nbiosdisks; i++) { 1645 if (h1 < (unsigned int)dl->dl_biosdisks[i].bi_head) 1646 h1 = dl->dl_biosdisks[i].bi_head; 1647 if (c1 < (unsigned int)dl->dl_biosdisks[i].bi_cyl) 1648 c1 = dl->dl_biosdisks[i].bi_cyl; 1649 } 1650 } 1651 #endif 1652 dos_sectors = MAXSECTOR; 1653 dos_heads = h1; 1654 dos_cylinders = disklabel.d_secperunit / (MAXSECTOR * h1); 1655 if (dos_cylinders > c1) 1656 dos_cylinders = c1; 1657 } 1658 1659 /* Try to deduce the number of heads from two different mappings. */ 1660 for (i = 0; i < MBR_PART_COUNT * 2 - 1; i++) { 1661 if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) 1662 continue; 1663 a1 -= s1; 1664 for (j = i + 1; j < MBR_PART_COUNT * 2; j++) { 1665 if (get_mapping(j, &c2, &h2, &s2, &a2) < 0) 1666 continue; 1667 a2 -= s2; 1668 num = (uint64_t)h1 * a2 - (uint64_t)h2 * a1; 1669 denom = (uint64_t)c2 * a1 - (uint64_t)c1 * a2; 1670 if (denom != 0 && num != 0 && num % denom == 0) { 1671 xheads = num / denom; 1672 xsectors = a1 / (c1 * xheads + h1); 1673 break; 1674 } 1675 } 1676 if (xheads != -1) 1677 break; 1678 } 1679 1680 if (xheads == -1) { 1681 if (F_flag) 1682 return; 1683 warnx("Cannot determine the number of heads"); 1684 return; 1685 } 1686 1687 if (xsectors == -1) { 1688 warnx("Cannot determine the number of sectors"); 1689 return; 1690 } 1691 1692 /* Estimate the number of cylinders. */ 1693 xcylinders = disklabel.d_secperunit / xheads / xsectors; 1694 if (disklabel.d_secperunit > xcylinders * xheads * xsectors) 1695 xcylinders++; 1696 1697 /* 1698 * Now verify consistency with each of the partition table entries. 1699 * Be willing to shove cylinders up a little bit to make things work, 1700 * but translation mismatches are fatal. 1701 */ 1702 for (i = 0; i < MBR_PART_COUNT * 2; i++) { 1703 if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) 1704 continue; 1705 if (c1 >= MAXCYL - 2) 1706 continue; 1707 if (xsectors * (c1 * xheads + h1) + s1 != a1) 1708 return; 1709 } 1710 1711 1712 /* Everything checks out. 1713 * Reset the geometry to use for further calculations. 1714 * But cylinders cannot be > 1024. 1715 */ 1716 if (xcylinders > MAXCYL) 1717 dos_cylinders = MAXCYL; 1718 else 1719 dos_cylinders = xcylinders; 1720 dos_heads = xheads; 1721 dos_sectors = xsectors; 1722 } 1723 1724 /* 1725 * For the purposes of intuit_translated_geometry(), treat the partition 1726 * table as a list of eight mapping between (cylinder, head, sector) 1727 * triplets and absolute sectors. Get the relevant geometry triplet and 1728 * absolute sectors for a given entry, or return -1 if it isn't present. 1729 * Note: for simplicity, the returned sector is 0-based. 1730 */ 1731 static int 1732 get_mapping(int i, unsigned int *cylinder, unsigned int *head, unsigned int *sector, 1733 unsigned long *absolute) 1734 { 1735 struct mbr_partition *part = &mboot.mbr_parts[i / 2]; 1736 1737 if (part->mbrp_type == 0) 1738 return -1; 1739 if (i % 2 == 0) { 1740 *cylinder = MBR_PCYL(part->mbrp_scyl, part->mbrp_ssect); 1741 *head = part->mbrp_shd; 1742 *sector = MBR_PSECT(part->mbrp_ssect); 1743 *absolute = le32toh(part->mbrp_start); 1744 } else { 1745 *cylinder = MBR_PCYL(part->mbrp_ecyl, part->mbrp_esect); 1746 *head = part->mbrp_ehd; 1747 *sector = MBR_PSECT(part->mbrp_esect); 1748 *absolute = le32toh(part->mbrp_start) 1749 + le32toh(part->mbrp_size) - 1; 1750 } 1751 /* Sanity check the data against all zeroes */ 1752 if ((*cylinder == 0) && (*sector == 0) && (*head == 0)) 1753 return -1; 1754 /* sector numbers in the MBR partition table start at 1 */ 1755 *sector = *sector - 1; 1756 /* Sanity check the data against max values */ 1757 if ((((*cylinder * MAXHEAD) + *head) * MAXSECTOR + *sector) < *absolute) 1758 /* cannot be a CHS mapping */ 1759 return -1; 1760 return 0; 1761 } 1762 1763 static void 1764 delete_ptn(int part) 1765 { 1766 if (part == ext.ptn_id) { 1767 /* forget all about the extended partition */ 1768 free(ext.ptn); 1769 memset(&ext, 0, sizeof ext); 1770 } 1771 1772 mboot.mbr_parts[part].mbrp_type = 0; 1773 } 1774 1775 static void 1776 delete_ext_ptn(int part) 1777 { 1778 1779 if (part == 0) { 1780 ext.ptn[0].mbr_parts[0].mbrp_type = 0; 1781 return; 1782 } 1783 ext.ptn[part - 1].mbr_parts[1] = ext.ptn[part].mbr_parts[1]; 1784 memmove(&ext.ptn[part], &ext.ptn[part + 1], 1785 (ext.num_ptn - part - 1) * sizeof ext.ptn[0]); 1786 ext.num_ptn--; 1787 } 1788 1789 static int 1790 add_ext_ptn(daddr_t start, daddr_t size) 1791 { 1792 int part; 1793 struct mbr_partition *partp; 1794 1795 if (reallocarr(&ext.ptn, ext.num_ptn + 1, sizeof(*ext.ptn)) != 0) 1796 err(1, "reallocarr"); 1797 for (part = 0; part < ext.num_ptn; part++) 1798 if (ext_offset(part) > start) 1799 break; 1800 /* insert before 'part' - make space... */ 1801 memmove(&ext.ptn[part + 1], &ext.ptn[part], 1802 (ext.num_ptn - part) * sizeof ext.ptn[0]); 1803 memset(&ext.ptn[part], 0, sizeof ext.ptn[0]); 1804 ext.ptn[part].mbr_magic = LE_MBR_MAGIC; 1805 /* we will be 'part' */ 1806 if (part == 0) { 1807 /* link us to 'next' */ 1808 partp = &ext.ptn[0].mbr_parts[1]; 1809 /* offset will be fixed by caller */ 1810 partp->mbrp_size = htole32( 1811 le32toh(ext.ptn[1].mbr_parts[0].mbrp_start) + 1812 le32toh(ext.ptn[1].mbr_parts[0].mbrp_size)); 1813 } else { 1814 /* link us to prev's next */ 1815 partp = &ext.ptn[part - 1].mbr_parts[1]; 1816 ext.ptn[part].mbr_parts[1] = *partp; 1817 /* and prev onto us */ 1818 partp->mbrp_start = htole32(start - ptn_0_offset - ext.base); 1819 partp->mbrp_size = htole32(size + ptn_0_offset); 1820 } 1821 partp->mbrp_type = 5; /* as used by win98 */ 1822 partp->mbrp_flag = 0; 1823 /* wallop in some CHS values - win98 doesn't saturate them */ 1824 dos(le32toh(partp->mbrp_start), 1825 &partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect); 1826 dos(le32toh(partp->mbrp_start) + le32toh(partp->mbrp_size) - 1, 1827 &partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect); 1828 ext.num_ptn++; 1829 1830 return part; 1831 } 1832 1833 static const char * 1834 check_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix) 1835 { 1836 int p; 1837 unsigned int p_s, p_e; 1838 1839 if (sysid != 0) { 1840 if (start == 0) 1841 return "Sector zero is reserved for the MBR"; 1842 #if 0 1843 if (start < ptn_0_offset) 1844 /* This is just a convention, not a requirement */ 1845 return "Track zero is reserved for the BIOS"; 1846 #endif 1847 if (start + size > disksectors) 1848 return "Partition exceeds size of disk"; 1849 for (p = 0; p < MBR_PART_COUNT; p++) { 1850 if (p == part || mboot.mbr_parts[p].mbrp_type == 0) 1851 continue; 1852 p_s = le32toh(mboot.mbr_parts[p].mbrp_start); 1853 p_e = p_s + le32toh(mboot.mbr_parts[p].mbrp_size); 1854 if (start + size <= p_s || start >= p_e) 1855 continue; 1856 if (f_flag) { 1857 if (fix) 1858 delete_ptn(p); 1859 return 0; 1860 } 1861 return "Overlaps another partition"; 1862 } 1863 } 1864 1865 /* Are we trying to create an extended partition */ 1866 if (!MBR_IS_EXTENDED(mboot.mbr_parts[part].mbrp_type)) { 1867 /* this wasn't the extended partition */ 1868 if (!MBR_IS_EXTENDED(sysid)) 1869 return 0; 1870 /* making an extended partition */ 1871 if (ext.base != 0) { 1872 if (!f_flag) 1873 return "There cannot be 2 extended partitions"; 1874 if (fix) 1875 delete_ptn(ext.ptn_id); 1876 } 1877 if (fix) { 1878 /* allocate a new extended partition */ 1879 ext.ptn = calloc(1, sizeof ext.ptn[0]); 1880 if (ext.ptn == NULL) 1881 err(1, "Malloc failed"); 1882 ext.ptn[0].mbr_magic = LE_MBR_MAGIC; 1883 ext.ptn_id = part; 1884 ext.base = start; 1885 ext.limit = start + size; 1886 ext.num_ptn = 1; 1887 } 1888 return 0; 1889 } 1890 1891 /* Check we haven't cut space allocated to an extended ptn */ 1892 1893 if (!MBR_IS_EXTENDED(sysid)) { 1894 /* no longer an extended partition */ 1895 if (fix) { 1896 /* Kill all memory of the extended partitions */ 1897 delete_ptn(part); 1898 return 0; 1899 } 1900 if (ext.num_ptn == 0 || 1901 (ext.num_ptn == 1 && ext.ptn[0].mbr_parts[0].mbrp_type == 0)) 1902 /* nothing in extended partition */ 1903 return 0; 1904 if (f_flag) 1905 return 0; 1906 if (yesno("Do you really want to delete all the extended partitions?")) 1907 return 0; 1908 return "Extended partition busy"; 1909 } 1910 1911 if (le32toh(mboot.mbr_parts[part].mbrp_start) != ext.base) 1912 /* maybe impossible, but an extra sanity check */ 1913 return 0; 1914 1915 for (p = ext.num_ptn; --p >= 0;) { 1916 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1917 continue; 1918 p_s = ext_offset(p); 1919 p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1920 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 1921 if (p_s >= start && p_e <= start + size) 1922 continue; 1923 if (!f_flag) 1924 return "Extended partition outside main partition"; 1925 if (fix) 1926 delete_ext_ptn(p); 1927 } 1928 1929 if (fix && start != ext.base) { 1930 /* The internal offsets need to be fixed up */ 1931 for (p = 0; p < ext.num_ptn - 1; p++) 1932 ext.ptn[p].mbr_parts[1].mbrp_start = htole32( 1933 le32toh(ext.ptn[p].mbr_parts[1].mbrp_start) 1934 + ext.base - start); 1935 /* and maybe an empty partition at the start */ 1936 if (ext.ptn[0].mbr_parts[0].mbrp_type == 0) { 1937 if (le32toh(ext.ptn[0].mbr_parts[1].mbrp_start) == 0) { 1938 /* don't need the empty slot */ 1939 memmove(&ext.ptn[0], &ext.ptn[1], 1940 (ext.num_ptn - 1) * sizeof ext.ptn[0]); 1941 ext.num_ptn--; 1942 } 1943 } else { 1944 /* must create an empty slot */ 1945 add_ext_ptn(start, ptn_0_offset); 1946 ext.ptn[0].mbr_parts[1].mbrp_start = htole32(ext.base 1947 - start); 1948 } 1949 } 1950 if (fix) { 1951 ext.base = start; 1952 ext.limit = start + size; 1953 } 1954 return 0; 1955 } 1956 1957 static const char * 1958 check_ext_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix) 1959 { 1960 int p; 1961 unsigned int p_s, p_e; 1962 1963 if (sysid == 0) 1964 return 0; 1965 1966 if (MBR_IS_EXTENDED(sysid)) 1967 return "Nested extended partitions are not allowed"; 1968 1969 /* allow one track at start for extended partition header */ 1970 start -= ptn_0_offset; 1971 size += ptn_0_offset; 1972 if (start < ext.base || start + size > ext.limit) 1973 return "Outside bounds of extended partition"; 1974 1975 if (f_flag && !fix) 1976 return 0; 1977 1978 for (p = ext.num_ptn; --p >= 0;) { 1979 if (p == part || ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1980 continue; 1981 p_s = ext_offset(p); 1982 p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1983 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 1984 if (p == 0) 1985 p_s += le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1986 - ptn_0_offset; 1987 if (start < p_e && start + size > p_s) { 1988 if (!f_flag) 1989 return "Overlaps another extended partition"; 1990 if (fix) { 1991 if (part == -1) 1992 delete_ext_ptn(p); 1993 else 1994 /* must not change numbering yet */ 1995 ext.ptn[p].mbr_parts[0].mbrp_type = 0; 1996 } 1997 } 1998 } 1999 return 0; 2000 } 2001 2002 static int 2003 change_part(int extended, int part, int sysid, daddr_t start, daddr_t size, 2004 char *bootmenu) 2005 { 2006 struct mbr_partition *partp; 2007 struct mbr_sector *boot; 2008 daddr_t offset; 2009 const char *e; 2010 int upart = part; 2011 int p; 2012 int fl; 2013 daddr_t n_s, n_e; 2014 const char *errtext; 2015 #ifdef BOOTSEL 2016 char tmp_bootmenu[MBR_PART_COUNT * (MBR_BS_PARTNAMESIZE + 1)]; 2017 int bootmenu_len = (extended ? MBR_PART_COUNT : 1) * (MBR_BS_PARTNAMESIZE + 1); 2018 #endif 2019 2020 if (extended) { 2021 if (part != -1 && part < ext.num_ptn) { 2022 boot = &ext.ptn[part]; 2023 partp = &boot->mbr_parts[0]; 2024 offset = ext_offset(part); 2025 } else { 2026 part = -1; 2027 boot = 0; 2028 partp = 0; 2029 offset = 0; 2030 } 2031 upart = 0; 2032 e = "E"; 2033 } else { 2034 boot = &mboot; 2035 partp = &boot->mbr_parts[part]; 2036 offset = 0; 2037 e = ""; 2038 } 2039 2040 if (!f_flag && part != -1) { 2041 printf("The data for partition %s%d is:\n", e, part); 2042 print_part(boot, upart, offset); 2043 } 2044 2045 #ifdef BOOTSEL 2046 if (bootmenu != NULL) 2047 strlcpy(tmp_bootmenu, bootmenu, bootmenu_len); 2048 else 2049 if (boot != NULL && boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) 2050 strlcpy(tmp_bootmenu, 2051 boot->mbr_bootsel.mbrbs_nametab[upart], 2052 bootmenu_len); 2053 else 2054 tmp_bootmenu[0] = 0; 2055 #endif 2056 2057 if (partp != NULL) { 2058 if (!s_flag) { 2059 /* values not specified, default to current ones */ 2060 sysid = partp->mbrp_type; 2061 start = offset + le32toh(partp->mbrp_start); 2062 size = le32toh(partp->mbrp_size); 2063 } else { 2064 if (sysid == -1) 2065 sysid = partp->mbrp_type; 2066 if (start == (daddr_t)0xffffffff) { 2067 start = offset + le32toh(partp->mbrp_start); 2068 if (start == 0) 2069 start = offset = ptn_0_offset; 2070 } 2071 if (size == (daddr_t)0xffffffff) { 2072 size = le32toh(partp->mbrp_size); 2073 if (size == 0) 2074 size = disksectors - start; 2075 } 2076 } 2077 } 2078 2079 /* creating a new partition, default to free space */ 2080 if (!s_flag && sysid == 0 && extended) { 2081 /* non-extended partition */ 2082 start = ext.base; 2083 for (p = 0; p < ext.num_ptn; p++) { 2084 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2085 continue; 2086 n_s = ext_offset(p); 2087 if (n_s > start + ptn_0_offset) 2088 break; 2089 start = ext_offset(p) 2090 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 2091 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 2092 } 2093 if (ext.limit - start <= ptn_0_offset) { 2094 printf("No space in extended partition\n"); 2095 return 0; 2096 } 2097 start += ptn_0_offset; 2098 } 2099 2100 if (!s_flag && sysid == 0 && !extended) { 2101 /* same for non-extended partition */ 2102 /* first see if old start is free */ 2103 if (start < ptn_0_offset) 2104 start = 0; 2105 for (p = 0; start != 0 && p < MBR_PART_COUNT; p++) { 2106 if (mboot.mbr_parts[p].mbrp_type == 0) 2107 continue; 2108 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2109 if (start >= n_s && 2110 start < n_s + le32toh(mboot.mbr_parts[p].mbrp_size)) 2111 start = 0; 2112 } 2113 if (start == 0) { 2114 /* Look for first gap */ 2115 start = ptn_0_offset; 2116 for (p = 0; p < MBR_PART_COUNT; p++) { 2117 if (mboot.mbr_parts[p].mbrp_type == 0) 2118 continue; 2119 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2120 n_e = n_s + le32toh(mboot.mbr_parts[p].mbrp_size); 2121 if (start >= n_s && start < n_e) { 2122 start = n_e; 2123 p = -1; 2124 } 2125 } 2126 if (start >= disksectors && !I_flag) { 2127 printf("No free space\n"); 2128 return 0; 2129 } 2130 } 2131 } 2132 2133 if (!f_flag) { 2134 /* request new values from user */ 2135 if (sysid == 0) 2136 sysid = 169; 2137 sysid = decimal("sysid", sysid, 0, 0, 255); 2138 if (sysid == 0 && !v_flag) { 2139 start = 0; 2140 size = 0; 2141 #ifdef BOOTSEL 2142 tmp_bootmenu[0] = 0; 2143 #endif 2144 } else { 2145 daddr_t old = start; 2146 daddr_t lim = extended ? ext.limit : disksectors; 2147 start = decimal("start", start, 2148 DEC_SEC | DEC_RND_0 | (extended ? DEC_RND : 0), 2149 extended ? ext.base : 0, lim); 2150 /* Adjust 'size' so that end doesn't move when 'start' 2151 * is only changed slightly. 2152 */ 2153 if (size > start - old) 2154 size -= start - old; 2155 else 2156 size = 0; 2157 /* Find end of available space from this start point */ 2158 if (extended) { 2159 for (p = 0; p < ext.num_ptn; p++) { 2160 if (p == part) 2161 continue; 2162 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2163 continue; 2164 n_s = ext_offset(p); 2165 if (n_s > start && n_s < lim) 2166 lim = n_s; 2167 if (start >= n_s && start < n_s 2168 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 2169 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size)) { 2170 lim = start; 2171 break; 2172 } 2173 } 2174 } else { 2175 for (p = 0; p < MBR_PART_COUNT; p++) { 2176 if (p == part) 2177 continue; 2178 if (mboot.mbr_parts[p].mbrp_type == 0) 2179 continue; 2180 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2181 if (n_s > start && n_s < lim) 2182 lim = n_s; 2183 if (start >= n_s && start < n_s 2184 + le32toh(mboot.mbr_parts[p].mbrp_size)) { 2185 lim = start; 2186 break; 2187 } 2188 } 2189 } 2190 lim -= start; 2191 if (lim == 0) { 2192 printf("Start sector already allocated\n"); 2193 return 0; 2194 } 2195 if (size == 0 || size > lim) 2196 size = lim; 2197 fl = DEC_SEC; 2198 if (start % ptn_alignment == ptn_0_offset) 2199 fl |= DEC_RND_DOWN; 2200 if (start == 2 * ptn_0_offset) 2201 fl |= DEC_RND_DOWN | DEC_RND_DOWN_2; 2202 size = decimal("size", size, fl, 0, lim); 2203 #ifdef BOOTSEL 2204 #ifndef DEFAULT_BOOTEXTCODE 2205 if (!extended) 2206 #endif 2207 string("bootmenu", bootmenu_len, tmp_bootmenu); 2208 #endif 2209 } 2210 } 2211 2212 /* 2213 * Before we write these away, we must verify that nothing 2214 * untoward has been requested. 2215 */ 2216 2217 if (extended) 2218 errtext = check_ext_overlap(part, sysid, start, size, 0); 2219 else 2220 errtext = check_overlap(part, sysid, start, size, 0); 2221 if (errtext != NULL && !I_flag) { 2222 if (f_flag) 2223 errx(2, "%s", errtext); 2224 printf("%s\n", errtext); 2225 return 0; 2226 } 2227 2228 /* 2229 * Before proceeding, delete any overlapped partitions. 2230 * This can only happen if '-f' was supplied on the command line. 2231 * Just hope the caller knows what they are doing. 2232 * This also fixes the base of each extended partition if the 2233 * partition itself has moved. 2234 */ 2235 if (!I_flag) { 2236 if (extended) 2237 errtext = check_ext_overlap(part, sysid, start, size, 1); 2238 else 2239 errtext = check_overlap(part, sysid, start, size, 1); 2240 if (errtext) 2241 errx(1, "%s", errtext); 2242 } 2243 2244 2245 if (sysid == 0) { 2246 /* delete this partition - save info though */ 2247 if (partp == NULL) 2248 /* must have been trying to create an extended ptn */ 2249 return 0; 2250 if (start == 0 && size == 0) 2251 memset(partp, 0, sizeof *partp); 2252 #ifdef BOOTSEL 2253 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) 2254 memset(boot->mbr_bootsel.mbrbs_nametab[upart], 0, 2255 sizeof boot->mbr_bootsel.mbrbs_nametab[0]); 2256 #endif 2257 if (extended) 2258 delete_ext_ptn(part); 2259 else 2260 delete_ptn(part); 2261 return 1; 2262 } 2263 2264 2265 if (extended) { 2266 if (part != -1) 2267 delete_ext_ptn(part); 2268 if (start == ext.base + ptn_0_offset) 2269 /* First one must have been free */ 2270 part = 0; 2271 else 2272 part = add_ext_ptn(start, size); 2273 2274 /* These must be re-calculated because of the realloc */ 2275 boot = &ext.ptn[part]; 2276 partp = &boot->mbr_parts[0]; 2277 offset = ext_offset(part); 2278 } 2279 2280 partp->mbrp_type = sysid; 2281 partp->mbrp_start = htole32( start - offset); 2282 partp->mbrp_size = htole32( size); 2283 dos(start, &partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect); 2284 dos(start + size - 1, 2285 &partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect); 2286 #ifdef BOOTSEL 2287 if (extended) { 2288 boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC; 2289 strncpy(boot->mbr_bootsel.mbrbs_nametab[upart], tmp_bootmenu, 2290 bootmenu_len); 2291 } else { 2292 /* We need to bootselect code installed in order to have 2293 * somewhere to safely write the menu tag. 2294 */ 2295 if (boot->mbr_bootsel_magic != LE_MBR_BS_MAGIC) { 2296 if (f_flag || 2297 yesno("The bootselect code is not installed, " 2298 "do you want to install it now?")) 2299 install_bootsel(MBR_BS_ACTIVE); 2300 } 2301 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 2302 strncpy(boot->mbr_bootsel.mbrbs_nametab[upart], 2303 tmp_bootmenu, bootmenu_len); 2304 } 2305 } 2306 #endif 2307 2308 if (v_flag && !f_flag && yesno("Explicitly specify beg/end address?")) { 2309 /* this really isn't a good idea.... */ 2310 int tsector, tcylinder, thead; 2311 2312 tcylinder = MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect); 2313 thead = partp->mbrp_shd; 2314 tsector = MBR_PSECT(partp->mbrp_ssect); 2315 tcylinder = decimal("beginning cylinder", 2316 tcylinder, 0, 0, dos_cylinders - 1); 2317 thead = decimal("beginning head", 2318 thead, 0, 0, dos_heads - 1); 2319 tsector = decimal("beginning sector", 2320 tsector, 0, 1, dos_sectors); 2321 partp->mbrp_scyl = DOSCYL(tcylinder); 2322 partp->mbrp_shd = thead; 2323 partp->mbrp_ssect = DOSSECT(tsector, tcylinder); 2324 2325 tcylinder = MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect); 2326 thead = partp->mbrp_ehd; 2327 tsector = MBR_PSECT(partp->mbrp_esect); 2328 tcylinder = decimal("ending cylinder", 2329 tcylinder, 0, 0, dos_cylinders - 1); 2330 thead = decimal("ending head", 2331 thead, 0, 0, dos_heads - 1); 2332 tsector = decimal("ending sector", 2333 tsector, 0, 1, dos_sectors); 2334 partp->mbrp_ecyl = DOSCYL(tcylinder); 2335 partp->mbrp_ehd = thead; 2336 partp->mbrp_esect = DOSSECT(tsector, tcylinder); 2337 } 2338 2339 /* If we had to mark an extended partition as deleted because 2340 * another request would have overlapped it, now is the time 2341 * to do the actual delete. 2342 */ 2343 if (extended && f_flag) { 2344 for (p = ext.num_ptn; --p >= 0;) 2345 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2346 delete_ext_ptn(p); 2347 } 2348 return 1; 2349 } 2350 2351 static void 2352 print_geometry(void) 2353 { 2354 2355 if (sh_flag) { 2356 printf("DISK=%s\n", disk); 2357 printf("DLCYL=%d\nDLHEAD=%d\nDLSEC=%d\nDLSIZE=%"PRIdaddr"\n", 2358 cylinders, heads, sectors, disksectors); 2359 printf("BCYL=%d\nBHEAD=%d\nBSEC=%d\nBDLSIZE=%"PRIdaddr"\n", 2360 dos_cylinders, dos_heads, dos_sectors, dos_disksectors); 2361 printf("NUMEXTPTN=%d\n", ext.num_ptn); 2362 return; 2363 } 2364 2365 /* Not sh_flag */ 2366 printf("Disk: %s\n", disk); 2367 printf("NetBSD disklabel disk geometry:\n"); 2368 printf("cylinders: %d, heads: %d, sectors/track: %d " 2369 "(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr", " 2370 "bytes/sector: %zd\n\n", cylinders, heads, sectors, 2371 cylindersectors, disksectors, secsize); 2372 printf("BIOS disk geometry:\n"); 2373 printf("cylinders: %d, heads: %d, sectors/track: %d " 2374 "(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr"\n\n", 2375 dos_cylinders, dos_heads, dos_sectors, dos_cylindersectors, 2376 dos_disksectors); 2377 printf("Partitions aligned to %d sector boundaries, offset %d\n\n", 2378 ptn_alignment, ptn_0_offset); 2379 } 2380 2381 /* Find the first active partition, else return MBR_PART_COUNT */ 2382 static int 2383 first_active(void) 2384 { 2385 struct mbr_partition *partp = &mboot.mbr_parts[0]; 2386 int part; 2387 2388 for (part = 0; part < MBR_PART_COUNT; part++) 2389 if (partp[part].mbrp_flag & MBR_PFLAG_ACTIVE) 2390 return part; 2391 return MBR_PART_COUNT; 2392 } 2393 2394 static void 2395 change_active(int which) 2396 { 2397 struct mbr_partition *partp; 2398 int part; 2399 int active = MBR_PART_COUNT; 2400 2401 partp = &mboot.mbr_parts[0]; 2402 2403 if (a_flag && which != -1) 2404 active = which; 2405 else 2406 active = first_active(); 2407 if (!f_flag) { 2408 if (yesno("Do you want to change the active partition?")) { 2409 printf ("Choosing %d will make no partition active.\n", 2410 MBR_PART_COUNT); 2411 do { 2412 active = decimal("active partition", 2413 active, 0, 0, MBR_PART_COUNT); 2414 } while (!yesno("Are you happy with this choice?")); 2415 } else 2416 return; 2417 } else 2418 if (active != MBR_PART_COUNT) 2419 printf ("Making partition %d active.\n", active); 2420 2421 for (part = 0; part < MBR_PART_COUNT; part++) 2422 partp[part].mbrp_flag &= ~MBR_PFLAG_ACTIVE; 2423 if (active < MBR_PART_COUNT) 2424 partp[active].mbrp_flag |= MBR_PFLAG_ACTIVE; 2425 } 2426 2427 static void 2428 change_bios_geometry(void) 2429 { 2430 print_geometry(); 2431 if (!yesno("Do you want to change our idea of what BIOS thinks?")) 2432 return; 2433 2434 #if defined(USE_DISKLIST) 2435 if (dl != NULL) { 2436 struct biosdisk_info *bip; 2437 int i; 2438 2439 for (i = 0; i < dl->dl_nbiosdisks; i++) { 2440 if (i == 0) 2441 printf("\nGeometries of known disks:\n"); 2442 bip = &dl->dl_biosdisks[i]; 2443 printf("Disk %d: cylinders %u, heads %u, sectors %u" 2444 " (%"PRIdaddr" sectors, %dMB)\n", 2445 i, bip->bi_cyl, bip->bi_head, bip->bi_sec, 2446 bip->bi_lbasecs, SEC_TO_MB(bip->bi_lbasecs)); 2447 } 2448 printf("\n"); 2449 } 2450 #endif 2451 do { 2452 dos_cylinders = decimal("BIOS's idea of #cylinders", 2453 dos_cylinders, 0, 0, MAXCYL); 2454 dos_heads = decimal("BIOS's idea of #heads", 2455 dos_heads, 0, 0, MAXHEAD); 2456 dos_sectors = decimal("BIOS's idea of #sectors", 2457 dos_sectors, 0, 1, MAXSECTOR); 2458 print_geometry(); 2459 } while (!yesno("Are you happy with this choice?")); 2460 } 2461 2462 2463 /***********************************************\ 2464 * Change real numbers into strange dos numbers * 2465 \***********************************************/ 2466 static void 2467 dos(int sector, unsigned char *cylinderp, unsigned char *headp, 2468 unsigned char *sectorp) 2469 { 2470 int cylinder, head; 2471 2472 cylinder = sector / dos_cylindersectors; 2473 sector -= cylinder * dos_cylindersectors; 2474 2475 head = sector / dos_sectors; 2476 sector -= head * dos_sectors; 2477 if (cylinder > 1023) 2478 cylinder = 1023; 2479 2480 *cylinderp = DOSCYL(cylinder); 2481 *headp = head; 2482 *sectorp = DOSSECT(sector + 1, cylinder); 2483 } 2484 2485 static int 2486 open_disk(int update) 2487 { 2488 static char namebuf[MAXPATHLEN + 1]; 2489 int flags = update && disk_file == NULL ? O_RDWR : O_RDONLY; 2490 2491 if (!F_flag) { 2492 fd = opendisk(disk, flags, namebuf, sizeof(namebuf), 0); 2493 if (fd < 0) { 2494 if (errno == ENODEV) 2495 warnx("%s is not a character device", namebuf); 2496 else 2497 warn("cannot opendisk %s", namebuf); 2498 return -1; 2499 } 2500 disk = namebuf; 2501 } else { 2502 fd = open(disk, flags, 0); 2503 if (fd == -1) { 2504 warn("cannot open %s", disk); 2505 return -1; 2506 } 2507 } 2508 2509 if (get_params() == -1) { 2510 close(fd); 2511 fd = -1; 2512 return -1; 2513 } 2514 if (disk_file != NULL) { 2515 /* for testing: read/write data from a disk file */ 2516 wfd = open(disk_file, update ? O_RDWR|O_CREAT : O_RDONLY, 0777); 2517 if (wfd == -1) { 2518 warn("%s", disk_file); 2519 close(fd); 2520 fd = -1; 2521 return -1; 2522 } 2523 } else 2524 wfd = fd; 2525 return 0; 2526 } 2527 2528 static ssize_t 2529 read_disk(daddr_t sector, void *buf) 2530 { 2531 ssize_t nr; 2532 2533 if (*rfd == -1) 2534 errx(1, "read_disk(); fd == -1"); 2535 2536 if (secsize <= 0) 2537 errx(1, "read_disk(); secsize invalid"); 2538 2539 off_t offs = sector * (off_t)secsize; 2540 off_t mod = offs & (secsize - 1); 2541 off_t rnd = offs & ~(secsize - 1); 2542 2543 if (lseek(*rfd, rnd, SEEK_SET) == (off_t)-1) 2544 return -1; 2545 2546 if (secsize <= 512) 2547 return read(*rfd, buf, secsize); 2548 2549 if ((nr = read(*rfd, iobuf, secsize)) != secsize) 2550 return nr; 2551 2552 memcpy(buf, &iobuf[mod], 512); 2553 2554 return 512; 2555 } 2556 2557 static ssize_t 2558 write_disk(daddr_t sector, void *buf) 2559 { 2560 ssize_t nr; 2561 2562 if (wfd == -1) 2563 errx(1, "write_disk(); wfd == -1"); 2564 2565 off_t offs = sector * (off_t)secsize; 2566 off_t mod = offs & (secsize - 1); 2567 off_t rnd = offs & ~(secsize - 1); 2568 2569 if (lseek(wfd, rnd, SEEK_SET) == (off_t)-1) 2570 return -1; 2571 2572 if (secsize == 512) 2573 return write(wfd, buf, 512); 2574 2575 if ((nr = read(wfd, iobuf, secsize)) != secsize) 2576 return nr; 2577 2578 if (lseek(wfd, rnd, SEEK_SET) == (off_t)-1) 2579 return -1; 2580 2581 memcpy(&iobuf[mod], buf, 512); 2582 2583 if ((nr = write(wfd, iobuf, secsize)) != secsize) 2584 return nr; 2585 2586 return 512; 2587 } 2588 2589 static void 2590 guess_geometry(daddr_t _sectors) 2591 { 2592 dos_sectors = MAXSECTOR; 2593 dos_heads = MAXHEAD - 1; /* some BIOS might use 256 */ 2594 dos_cylinders = _sectors / (MAXSECTOR * (MAXHEAD - 1)); 2595 if (dos_cylinders < 1) 2596 dos_cylinders = 1; 2597 else if (dos_cylinders > MAXCYL - 1) 2598 dos_cylinders = MAXCYL - 1; 2599 } 2600 2601 static int 2602 get_params(void) 2603 { 2604 if (F_flag) { 2605 struct stat st; 2606 if (fstat(fd, &st) == -1) { 2607 warn("%s: fstat", disk); 2608 return -1; 2609 } 2610 if (st.st_size % 512 != 0) { 2611 warnx("%s size (%ju) is not divisible " 2612 "by sector size (%d)", disk, (uintmax_t)st.st_size, 2613 512); 2614 } 2615 disklabel.d_secperunit = st.st_size / 512; 2616 guess_geometry(disklabel.d_secperunit); 2617 disklabel.d_ncylinders = dos_cylinders; 2618 disklabel.d_ntracks = dos_heads; 2619 disklabel.d_secsize = 512; 2620 disklabel.d_nsectors = dos_sectors; 2621 } 2622 #if !HAVE_NBTOOL_CONFIG_H 2623 else if (ioctl(fd, DIOCGDEFLABEL, &disklabel) == -1) { 2624 warn("%s: DIOCGDEFLABEL", disk); 2625 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 2626 warn("%s: DIOCGDINFO", disk); 2627 return -1; 2628 } 2629 } 2630 #endif 2631 2632 disksectors = disklabel.d_secperunit; 2633 cylinders = disklabel.d_ncylinders; 2634 heads = disklabel.d_ntracks; 2635 secsize = disklabel.d_secsize; 2636 sectors = disklabel.d_nsectors; 2637 2638 /* pick up some defaults for the BIOS sizes */ 2639 if (sectors <= MAXSECTOR) { 2640 dos_cylinders = cylinders; 2641 dos_heads = heads; 2642 dos_sectors = sectors; 2643 } else { 2644 /* guess - has to better than the above */ 2645 guess_geometry(disksectors); 2646 } 2647 dos_disksectors = disksectors; 2648 2649 return 0; 2650 } 2651 2652 #ifdef BOOTSEL 2653 /* 2654 * Rather unfortunately the bootsel 'magic' number is at the end of the 2655 * the structure, and there is no checksum. So when other operating 2656 * systems install mbr code by only writing the length of their code they 2657 * can overwrite part of the structure but keeping the magic number intact. 2658 * This code attempts to empirically detect this problem. 2659 */ 2660 static int 2661 validate_bootsel(struct mbr_bootsel *mbs) 2662 { 2663 unsigned int key = mbs->mbrbs_defkey; 2664 unsigned int tmo; 2665 size_t i, j; 2666 2667 if (v_flag) 2668 return 0; 2669 2670 /* 2671 * Check default key is sane 2672 * - this is the most likely field to be stuffed 2673 * 16 disks and 16 bootable partitions seems enough! 2674 * (the keymap decode starts falling apart at that point) 2675 */ 2676 if (mbs->mbrbs_flags & MBR_BS_ASCII) { 2677 if (key != 0 && !(key == '\r' 2678 || (key >= '1' && key < '1' + MAX_BIOS_DISKS) 2679 || (key >= 'a' && key < 'a' + MAX_BIOS_DISKS))) 2680 return 1; 2681 } else { 2682 if (key != 0 && !(key == SCAN_ENTER 2683 || (key >= SCAN_1 && key < SCAN_1 + MAX_BIOS_DISKS) 2684 || (key >= SCAN_F1 && key < SCAN_F1 + MAX_BIOS_DISKS))) 2685 return 1; 2686 } 2687 2688 /* Checking the flags will lead to breakage... */ 2689 2690 /* Timeout value is expected to be a multiple of a second */ 2691 tmo = htole16(mbs->mbrbs_timeo); 2692 if (tmo != 0 && tmo != 0xffff && tmo != (10 * tmo + 9) / 182 * 182 / 10) 2693 return 2; 2694 2695 /* Check the menu strings are printable */ 2696 /* Unfortunately they aren't zero filled... */ 2697 for (j = 0; j < __arraycount(mbs->mbrbs_nametab); ++j) 2698 for (i = 0; i < sizeof(mbs->mbrbs_nametab[j]); i++) { 2699 int c = (uint8_t)mbs->mbrbs_nametab[j][i]; 2700 if (c == 0 || isprint(c)) 2701 continue; 2702 return 3; 2703 } 2704 2705 return 0; 2706 } 2707 #endif 2708 2709 static int 2710 read_s0(daddr_t offset, struct mbr_sector *boot) 2711 { 2712 const char *tabletype = offset ? "extended" : "primary"; 2713 #ifdef BOOTSEL 2714 static int reported; 2715 #endif 2716 2717 if (read_disk(offset, boot) == -1) { 2718 warn("Can't read %s partition table", tabletype); 2719 return -1; 2720 } 2721 if (boot->mbr_magic != LE_MBR_MAGIC) { 2722 if (F_flag && boot->mbr_magic == 0) 2723 return -1; 2724 warnx("%s partition table invalid, " 2725 "no magic in sector %"PRIdaddr, tabletype, offset); 2726 return -1; 2727 2728 } 2729 #ifdef BOOTSEL 2730 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 2731 /* mbr_bootsel in new location */ 2732 if (validate_bootsel(&boot->mbr_bootsel)) { 2733 warnx("removing corrupt bootsel information"); 2734 boot->mbr_bootsel_magic = 0; 2735 } 2736 return 0; 2737 } 2738 if (boot->mbr_bootsel_magic != LE_MBR_MAGIC) 2739 return 0; 2740 2741 /* mbr_bootsel in old location */ 2742 if (!reported) 2743 warnx("%s partition table: using old-style bootsel information", 2744 tabletype); 2745 reported = 1; 2746 if (validate_bootsel((void *)((uint8_t *)boot + MBR_BS_OFFSET + 4))) { 2747 warnx("%s bootsel information corrupt - ignoring", tabletype); 2748 return 0; 2749 } 2750 memmove((uint8_t *)boot + MBR_BS_OFFSET, 2751 (uint8_t *)boot + MBR_BS_OFFSET + 4, 2752 sizeof(struct mbr_bootsel)); 2753 if ( ! (boot->mbr_bootsel.mbrbs_flags & MBR_BS_NEWMBR)) { 2754 /* old style default key */ 2755 int id; 2756 /* F1..F4 => ptn 0..3, F5+ => disk 0+ */ 2757 id = boot->mbr_bootsel.mbrbs_defkey; 2758 id -= SCAN_F1; 2759 if (id >= MBR_PART_COUNT) 2760 id -= MBR_PART_COUNT; /* Use number of disk */ 2761 else if (mboot.mbr_parts[id].mbrp_type != 0) 2762 id = le32toh(boot->mbr_parts[id].mbrp_start); 2763 else 2764 id = DEFAULT_ACTIVE; 2765 boot->mbr_bootsel.mbrbs_defkey = id; 2766 } 2767 boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC; 2768 /* highlight that new bootsel code is necessary */ 2769 boot->mbr_bootsel.mbrbs_flags &= ~MBR_BS_NEWMBR; 2770 #endif /* BOOTSEL */ 2771 return 0; 2772 } 2773 2774 static int 2775 write_mbr(void) 2776 { 2777 int flag, i; 2778 daddr_t offset; 2779 int rval = -1; 2780 2781 /* 2782 * write enable label sector before write (if necessary), 2783 * disable after writing. 2784 * needed if the disklabel protected area also protects 2785 * sector 0. (e.g. empty disk) 2786 */ 2787 flag = 1; 2788 #if !HAVE_NBTOOL_CONFIG_H 2789 if (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0) 2790 warn("DIOCWLABEL"); 2791 #endif 2792 if (write_disk(0, &mboot) == -1) { 2793 warn("Can't write fdisk partition table"); 2794 goto protect_label; 2795 } 2796 if (boot_installed) 2797 for (i = bootsize; (i -= 0x200) > 0;) 2798 if (write_disk(i / 0x200, &bootcode[i / 0x200]) == -1) { 2799 warn("Can't write bootcode"); 2800 goto protect_label; 2801 } 2802 for (offset = 0, i = 0; i < ext.num_ptn; i++) { 2803 if (write_disk(ext.base + offset, ext.ptn + i) == -1) { 2804 warn("Can't write %dth extended partition", i); 2805 goto protect_label; 2806 } 2807 offset = le32toh(ext.ptn[i].mbr_parts[1].mbrp_start); 2808 } 2809 rval = 0; 2810 protect_label: 2811 flag = 0; 2812 #if !HAVE_NBTOOL_CONFIG_H 2813 if (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0) 2814 warn("DIOCWLABEL"); 2815 #endif 2816 return rval; 2817 } 2818 2819 static int 2820 yesno(const char *str, ...) 2821 { 2822 int ch, first; 2823 va_list ap; 2824 2825 va_start(ap, str); 2826 vprintf(str, ap); 2827 va_end(ap); 2828 printf(" [n] "); 2829 2830 first = ch = getchar(); 2831 while (ch != '\n' && ch != EOF) 2832 ch = getchar(); 2833 if (ch == EOF) 2834 errx(1, "EOF"); 2835 return first == 'y' || first == 'Y'; 2836 } 2837 2838 static int64_t 2839 decimal(const char *prompt, int64_t dflt, int flags, int64_t minval, int64_t maxval) 2840 { 2841 int64_t acc = 0; 2842 int valid; 2843 int len; 2844 char *cp; 2845 2846 for (;;) { 2847 if (flags & DEC_SEC) { 2848 printf("%s: [%" PRId64 "..%" PRId64 "cyl default: %" PRId64 ", %" PRId64 "cyl, %uMB] ", 2849 prompt, SEC_TO_CYL(minval), SEC_TO_CYL(maxval), 2850 dflt, SEC_TO_CYL(dflt), SEC_TO_MB(dflt)); 2851 } else 2852 printf("%s: [%" PRId64 "..%" PRId64 " default: %" PRId64 "] ", 2853 prompt, minval, maxval, dflt); 2854 2855 if (!fgets(lbuf, LBUF, stdin)) 2856 errx(1, "EOF"); 2857 cp = lbuf; 2858 2859 cp += strspn(cp, " \t"); 2860 if (*cp == '\n') 2861 return dflt; 2862 2863 if (cp[0] == '$' && cp[1] == '\n') 2864 return maxval; 2865 2866 if (isdigit((unsigned char)*cp) || *cp == '-') { 2867 acc = strtoll(lbuf, &cp, 10); 2868 len = strcspn(cp, " \t\n"); 2869 valid = 0; 2870 if (len != 0 && (flags & DEC_SEC)) { 2871 if (!strncasecmp(cp, "gb", len)) { 2872 acc *= 1024; 2873 valid = 1; 2874 } 2875 if (valid || !strncasecmp(cp, "mb", len)) { 2876 acc *= SEC_IN_1M; 2877 /* round to whole number of cylinders */ 2878 acc += ptn_alignment / 2; 2879 acc /= ptn_alignment; 2880 valid = 1; 2881 } 2882 if (valid || !strncasecmp(cp, "cyl", len)) { 2883 acc *= ptn_alignment; 2884 /* adjustments for cylinder boundary */ 2885 if (acc == 0 && flags & DEC_RND_0) 2886 acc += ptn_0_offset; 2887 if (flags & DEC_RND) 2888 acc += ptn_0_offset; 2889 if (flags & DEC_RND_DOWN) 2890 acc -= ptn_0_offset; 2891 if (flags & DEC_RND_DOWN_2) 2892 acc -= ptn_0_offset; 2893 cp += len; 2894 } 2895 } 2896 } 2897 2898 cp += strspn(cp, " \t"); 2899 if (*cp != '\n') { 2900 lbuf[strlen(lbuf) - 1] = 0; 2901 printf("%s is not a valid %s number.\n", lbuf, 2902 flags & DEC_SEC ? "sector" : "decimal"); 2903 continue; 2904 } 2905 2906 if (acc >= minval && acc <= maxval) 2907 return acc; 2908 printf("%" PRId64 " is not between %" PRId64 " and %" PRId64 ".\n", acc, minval, maxval); 2909 } 2910 } 2911 2912 static int 2913 ptn_id(const char *prompt, int *extended) 2914 { 2915 unsigned int acc = 0; 2916 char *cp; 2917 2918 for (;; printf("%s is not a valid partition number.\n", lbuf)) { 2919 printf("%s: [none] ", prompt); 2920 2921 if (!fgets(lbuf, LBUF, stdin)) 2922 errx(1, "EOF"); 2923 lbuf[strlen(lbuf)-1] = '\0'; 2924 cp = lbuf; 2925 2926 cp += strspn(cp, " \t"); 2927 *extended = 0; 2928 if (*cp == 0) 2929 return -1; 2930 2931 if (*cp == 'E' || *cp == 'e') { 2932 cp++; 2933 *extended = 1; 2934 } 2935 2936 acc = strtoul(cp, &cp, 10); 2937 2938 cp += strspn(cp, " \t"); 2939 if (*cp != '\0') 2940 continue; 2941 2942 if (*extended || acc < MBR_PART_COUNT) 2943 return acc; 2944 } 2945 } 2946 2947 #ifdef BOOTSEL 2948 static void 2949 string(const char *prompt, int length, char *buf) 2950 { 2951 int len; 2952 2953 for (;;) { 2954 printf("%s: [%.*s] (space to clear)", prompt, length, buf); 2955 2956 if (!fgets(lbuf, LBUF, stdin)) 2957 errx(1, "EOF"); 2958 len = strlen(lbuf); 2959 if (len <= 1) 2960 /* unchanged if just <enter> */ 2961 return; 2962 /* now strip trailing spaces, <space><enter> deletes string */ 2963 do 2964 lbuf[--len] = 0; 2965 while (len != 0 && lbuf[len - 1] == ' '); 2966 if (len < length) 2967 break; 2968 printf("'%s' is longer than %d characters.\n", 2969 lbuf, length - 1); 2970 } 2971 strncpy(buf, lbuf, length); 2972 } 2973 #endif 2974 2975 static int 2976 type_match(const void *key, const void *item) 2977 { 2978 const int *idp = key; 2979 const struct mbr_ptype *ptr = item; 2980 2981 if (*idp < ptr->id) 2982 return -1; 2983 if (*idp > ptr->id) 2984 return 1; 2985 return 0; 2986 } 2987 2988 static const char * 2989 get_type(int type) 2990 { 2991 const struct mbr_ptype *ptr; 2992 2993 ptr = bsearch(&type, mbr_ptypes, KNOWN_SYSIDS, 2994 sizeof(mbr_ptypes[0]), type_match); 2995 if (ptr == NULL) 2996 return "unknown"; 2997 return ptr->name; 2998 } 2999 3000 static int 3001 read_gpt(daddr_t offset, struct gpt_hdr *gptp) 3002 { 3003 char buf[512]; 3004 struct gpt_hdr *hdr = (void *)buf; 3005 const char *tabletype = GPT_TYPE(offset); 3006 3007 if (read_disk(offset, buf) == -1) { 3008 warn("Can't read %s GPT header", tabletype); 3009 return -1; 3010 } 3011 (void)memcpy(gptp, buf, GPT_HDR_SIZE); 3012 3013 /* GPT CRC should be calculated with CRC field preset to zero */ 3014 hdr->hdr_crc_self = 0; 3015 3016 if (memcmp(gptp->hdr_sig, GPT_HDR_SIG, sizeof(gptp->hdr_sig)) 3017 || gptp->hdr_lba_self != (uint64_t)offset 3018 || crc32(0, (void *)hdr, gptp->hdr_size) != gptp->hdr_crc_self) { 3019 /* not a GPT */ 3020 (void)memset(gptp, 0, GPT_HDR_SIZE); 3021 } 3022 3023 if (v_flag && gptp->hdr_size != 0) { 3024 printf("Found %s GPT header CRC %"PRIu32" " 3025 "at sector %"PRIdaddr", backup at %"PRIdaddr"\n", 3026 tabletype, gptp->hdr_crc_self, offset, gptp->hdr_lba_alt); 3027 } 3028 return gptp->hdr_size; 3029 3030 } 3031 3032 static int 3033 delete_gpt(struct gpt_hdr *gptp) 3034 { 3035 char buf[512]; 3036 struct gpt_hdr *hdr = (void *)buf; 3037 3038 if (g_flag) 3039 return 0; /* preserve existing GPT headers */ 3040 3041 if (gptp->hdr_size == 0) 3042 return 0; 3043 3044 /* don't accidently overwrite something important */ 3045 if (gptp->hdr_lba_self != GPT_HDR_BLKNO && 3046 gptp->hdr_lba_self != (uint64_t)disksectors - 1) { 3047 warnx("given GPT header location doesn't seem correct"); 3048 return -1; 3049 } 3050 3051 (void)memcpy(buf, gptp, GPT_HDR_SIZE); 3052 /* 3053 * Don't really delete GPT, just "disable" it, so it can 3054 * be recovered later in case of mistake or something 3055 */ 3056 (void)memset(hdr->hdr_sig, 0, sizeof(gptp->hdr_sig)); 3057 if (write_disk(gptp->hdr_lba_self, hdr) == -1) { 3058 warn("can't delete %s GPT header", 3059 GPT_TYPE(gptp->hdr_lba_self)); 3060 return -1; 3061 } 3062 (void)memset(gptp, 0, GPT_HDR_SIZE); 3063 return 1; 3064 } 3065
Indexes created Fri Sep 26 08:10:20 GMT 2025