fdisk.c revision 1.132
1 /* $NetBSD: fdisk.c,v 1.132 2011/08/27 17:16:01 joerg 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 1.132 2011/08/27 17:16:01 joerg 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 62 #if !HAVE_NBTOOL_CONFIG_H 63 #include <sys/disklabel.h> 64 #include <sys/disklabel_gpt.h> 65 #include <sys/bootblock.h> 66 #include <sys/ioctl.h> 67 #include <sys/sysctl.h> 68 #include <disktab.h> 69 #include <util.h> 70 #include <zlib.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 #ifndef DIOCGDEFLABEL 79 #define DIOCGDEFLABEL 0 80 #endif 81 #ifndef DIOCGDINFO 82 #define DIOCGDINFO 0 83 #endif 84 #ifndef DIOCWLABEL 85 #define DIOCWLABEL 0 86 #endif 87 #endif /* HAVE_NBTOOL_CONFIG_H */ 88 89 #define DEFAULT_BOOTDIR "/usr/mdec" 90 91 #define LE_MBR_MAGIC htole16(MBR_MAGIC) 92 #define LE_MBR_BS_MAGIC htole16(MBR_BS_MAGIC) 93 94 #if defined(__i386__) || defined(__x86_64__) 95 #if !HAVE_NBTOOL_CONFIG_H 96 #include <machine/cpu.h> 97 #endif /* !HAVE_NBTOOL_CONFIG_H */ 98 #define BOOTSEL 99 #endif 100 101 #ifdef BOOTSEL 102 103 #define DEFAULT_BOOTCODE "mbr" 104 #define DEFAULT_BOOTSELCODE "mbr_bootsel" 105 #define DEFAULT_BOOTEXTCODE "mbr_ext" 106 107 /* Scan values for the various keys we use, as returned by the BIOS */ 108 #define SCAN_ENTER 0x1c 109 #define SCAN_F1 0x3b 110 #define SCAN_1 0x2 111 112 113 #define MAX_BIOS_DISKS 16 /* Going beyond F12 is hard though! */ 114 115 /* We same the dflt 'boot partition' as a disk block, with some magic values. */ 116 #define DEFAULT_ACTIVE (~(daddr_t)0) 117 #define DEFAULT_DISK(n) (DEFAULT_ACTIVE - MAX_BIOS_DISKS + (n)) 118 119 #endif 120 121 #define GPT_TYPE(offs) ((offs) == GPT_HDR_BLKNO ? "primary" : "secondary") 122 123 #ifndef PRIdaddr 124 #define PRIdaddr PRId64 125 #endif 126 127 #ifndef _PATH_DEFDISK 128 #define _PATH_DEFDISK "/dev/rwd0d" 129 #endif 130 131 struct { 132 struct mbr_sector *ptn; /* array of pbrs */ 133 daddr_t base; /* first sector of ext. ptn */ 134 daddr_t limit; /* last sector of ext. ptn */ 135 int num_ptn; /* number of contained partitions */ 136 int ptn_id; /* entry in mbr */ 137 int is_corrupt; /* 1 if extended chain illegal */ 138 } ext; 139 140 #define LBUF 100 141 static char lbuf[LBUF]; 142 143 static const char *disk = _PATH_DEFDISK; 144 145 static struct disklabel disklabel; /* disk parameters */ 146 147 static struct mbr_sector mboot; 148 149 static const char *boot_dir = DEFAULT_BOOTDIR; 150 static char *boot_path = NULL; /* name of file we actually opened */ 151 152 #ifdef BOOTSEL 153 #define BOOTSEL_OPTIONS "B" 154 #else 155 #define BOOTSEL_OPTIONS 156 #define change_part(e, p, id, st, sz, bm) change__part(e, p, id, st, sz) 157 #endif 158 #define OPTIONS BOOTSEL_OPTIONS "0123FSafiluvA:b:c:E:r:s:w:" 159 160 /* 161 * Disk geometry and partition alignment. 162 * 163 * Modern disks do not have a fixed geomery and will always give a 'faked' 164 * geometry that matches the ATA standard - max 16 heads and 256 sec/track. 165 * The ATA geometry allows access to 2^28 sectors (as does LBA mode). 166 * 167 * The BIOS calls originally used an 8bit register for cylinder, head and 168 * sector. Later 2 bits were stolen from the sector number and added to 169 * cylinder number. The BIOS will translate this faked geometry either to 170 * the geometry reported by the disk, or do LBA reads (possibly LBA48). 171 * BIOS CHS reads have all sorts of limits, but 2^24 is absolute. 172 * For historic reasons the BIOS geometry is the called the dos geometry! 173 * 174 * If you know the disks real geometry it is usually worth aligning 175 * disk partitions to cylinder boundaries (certainly traditional!). 176 * For 'mbr' disks this has always been done with the BIOS geometry. 177 * The first track (typically 63 sectors) is reserved because the first 178 * sector is used for boot code. Similarly the data partition in an 179 * extended partition will start one track in. If an extended partition 180 * starts at the beginning of the disk you lose 2 tracks. 181 * 182 * However non-magnetic media in particular has physical sectors that are 183 * not the same size as those reported, so has to do read modify write 184 * sequences for misaligned transfers. The alignment of partitions to 185 * cylinder boundaries makes this happen all the time. 186 * 187 * It is thus sensible to align partitions on a sensible sector boundary. 188 * For instance 1MB (2048 sectors). 189 * Common code can do this by using a geometry with 1 head and 2048 190 * sectors per track. 191 */ 192 193 /* Disks reported geometry and overall size from device driver */ 194 static unsigned int cylinders, sectors, heads; 195 static daddr_t disksectors; 196 #define cylindersectors (heads * sectors) 197 198 /* Geometry from the BIOS */ 199 static unsigned int dos_cylinders; 200 static unsigned int dos_heads; 201 static unsigned int dos_sectors; 202 static daddr_t dos_disksectors; 203 #define dos_cylindersectors (dos_heads * dos_sectors) 204 #define dos_totalsectors (dos_heads * dos_sectors * dos_cylinders) 205 206 #define DOSSECT(s,c) (((s) & 0x3f) | (((c) >> 2) & 0xc0)) 207 #define DOSCYL(c) ((c) & 0xff) 208 #define SEC_IN_1M (1024 * 1024 / 512) 209 #define SEC_TO_MB(sec) ((unsigned int)(((sec) + SEC_IN_1M / 2) / SEC_IN_1M)) 210 #define SEC_TO_CYL(sec) (((sec) + dos_cylindersectors/2) / dos_cylindersectors) 211 212 #define MAXCYL 1024 /* Usual limit is 1023 */ 213 #define MAXHEAD 256 /* Usual limit is 255 */ 214 #define MAXSECTOR 63 215 static int partition = -1; 216 217 /* Alignment of partition, and offset if first sector unusable */ 218 static unsigned int ptn_alignment; /* default dos_cylindersectors */ 219 static unsigned int ptn_0_offset; /* default dos_sectors */ 220 221 static int fd = -1, wfd = -1, *rfd = &fd; 222 static char *disk_file = NULL; 223 static char *disk_type = NULL; 224 225 static int a_flag; /* set active partition */ 226 static int i_flag; /* init bootcode */ 227 static int u_flag; /* update partition data */ 228 static int v_flag; /* more verbose */ 229 static int sh_flag; /* Output data as shell defines */ 230 static int f_flag; /* force --not interactive */ 231 static int s_flag; /* set id,offset,size */ 232 static int b_flag; /* Set cyl, heads, secs (as c/h/s) */ 233 static int B_flag; /* Edit/install bootselect code */ 234 static int E_flag; /* extended partition number */ 235 static int b_cyl, b_head, b_sec; /* b_flag values. */ 236 237 #if !HAVE_NBTOOL_CONFIG_H 238 static int F_flag = 0; 239 #else 240 /* Tool - force 'file' mode to avoid unsupported functions and ioctls */ 241 static int F_flag = 1; 242 #endif 243 244 static struct gpt_hdr gpt1, gpt2; /* GUID partition tables */ 245 246 static struct mbr_sector bootcode[8192 / sizeof (struct mbr_sector)]; 247 static int bootsize; /* actual size of bootcode */ 248 static int boot_installed; /* 1 if we've copied code into the mbr */ 249 250 #if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H 251 #define USE_DISKLIST 252 static struct disklist *dl; 253 #endif 254 255 256 #define KNOWN_SYSIDS (sizeof(mbr_ptypes)/sizeof(mbr_ptypes[0])) 257 258 __dead static void usage(void); 259 static void print_s0(int); 260 static void print_part(struct mbr_sector *, int, daddr_t); 261 static void print_mbr_partition(struct mbr_sector *, int, daddr_t, daddr_t, int); 262 static void print_pbr(daddr_t, int, uint8_t); 263 static int is_all_zero(const unsigned char *, size_t); 264 static void printvis(int, const char *, const char *, size_t); 265 static int read_boot(const char *, void *, size_t, int); 266 static void init_sector0(int); 267 static void intuit_translated_geometry(void); 268 static void get_bios_geometry(void); 269 static void get_extended_ptn(void); 270 static static void get_ptn_alignmemt(void); 271 #if defined(USE_DISKLIST) 272 static void get_diskname(const char *, char *, size_t); 273 #endif 274 static int change_part(int, int, int, daddr_t, daddr_t, char *); 275 static void print_geometry(void); 276 static int first_active(void); 277 static void change_active(int); 278 static void change_bios_geometry(void); 279 static void dos(int, unsigned char *, unsigned char *, unsigned char *); 280 static int open_disk(int); 281 static int read_disk(daddr_t, void *); 282 static int write_disk(daddr_t, void *); 283 static int get_params(void); 284 static int read_s0(daddr_t, struct mbr_sector *); 285 static int write_mbr(void); 286 static int read_gpt(daddr_t, struct gpt_hdr *); 287 static int delete_gpt(struct gpt_hdr *); 288 static int yesno(const char *, ...); 289 static int64_t decimal(const char *, int64_t, int, int64_t, int64_t); 290 #define DEC_SEC 1 /* asking for a sector number */ 291 #define DEC_RND 2 /* round to end of first track */ 292 #define DEC_RND_0 4 /* convert 0 to size of a track */ 293 #define DEC_RND_DOWN 8 /* subtract 1 track */ 294 #define DEC_RND_DOWN_2 16 /* subtract 2 tracks */ 295 static void string(const char *, int, char *); 296 static int ptn_id(const char *, int *); 297 static int type_match(const void *, const void *); 298 static const char *get_type(int); 299 static int get_mapping(int, unsigned int *, unsigned int *, unsigned int *, unsigned long *); 300 #ifdef BOOTSEL 301 static daddr_t configure_bootsel(daddr_t); 302 static void install_bootsel(int); 303 static daddr_t get_default_boot(void); 304 static void set_default_boot(daddr_t); 305 #endif 306 307 static void 308 initvar_disk(const char **diskp) 309 { 310 #if !HAVE_NBTOOL_CONFIG_H 311 int mib[2]; 312 size_t len; 313 char *root_device; 314 315 mib[0] = CTL_KERN; 316 mib[1] = KERN_ROOT_DEVICE; 317 if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1 || 318 (root_device = malloc(len)) == NULL || 319 sysctl(mib, 2, root_device, &len, NULL, 0) == -1) 320 return; 321 322 *diskp = root_device; 323 #endif /* HAVE_NBTOOL_CONFIG_H */ 324 } 325 326 int 327 main(int argc, char *argv[]) 328 { 329 struct stat sb; 330 int ch; 331 size_t len; 332 char *cp; 333 int n; 334 #ifdef BOOTSEL 335 daddr_t default_ptn; /* start sector of default ptn */ 336 char *cbootmenu = 0; 337 #endif 338 339 int csysid; /* For the s_flag. */ 340 unsigned int cstart, csize; 341 a_flag = u_flag = sh_flag = f_flag = s_flag = b_flag = 0; 342 i_flag = B_flag = 0; 343 v_flag = 0; 344 E_flag = 0; 345 csysid = cstart = csize = 0; 346 while ((ch = getopt(argc, argv, OPTIONS)) != -1) { 347 switch (ch) { 348 case '0': 349 partition = 0; 350 break; 351 case '1': 352 partition = 1; 353 break; 354 case '2': 355 partition = 2; 356 break; 357 case '3': 358 partition = 3; 359 break; 360 case 'E': /* Extended partition number */ 361 E_flag = 1; 362 partition = strtoul(optarg, &cp, 0); 363 if (*cp || partition < 0) 364 errx(1, "Bad partition number -E %s.", optarg); 365 break; 366 #ifdef BOOTSEL 367 case 'B': /* Bootselect parameters */ 368 B_flag = 1; 369 break; 370 #endif 371 case 'F': /* device argument is really a file */ 372 F_flag = 1; 373 break; 374 case 'S': /* Output as shell variables */ 375 sh_flag = 1; 376 break; 377 case 'a': /* Set active partition */ 378 a_flag = 1; 379 break; 380 case 'f': /* Non interactive */ 381 f_flag = 1; 382 break; 383 case 'i': /* Always update bootcode */ 384 i_flag = 1; 385 break; 386 case 'l': /* List known partition types */ 387 for (len = 0; len < KNOWN_SYSIDS; len++) 388 printf("%03d %s\n", mbr_ptypes[len].id, 389 mbr_ptypes[len].name); 390 return 0; 391 case 'u': /* Update partition details */ 392 u_flag = 1; 393 break; 394 case 'v': /* Be verbose */ 395 v_flag++; 396 break; 397 case 's': /* Partition details */ 398 s_flag = 1; 399 if (sscanf(optarg, "%d/%u/%u%n", &csysid, &cstart, 400 &csize, &n) == 3) { 401 if (optarg[n] == 0) 402 break; 403 #ifdef BOOTSEL 404 if (optarg[n] == '/') { 405 cbootmenu = optarg + n + 1; 406 break; 407 } 408 #endif 409 } 410 errx(1, "Bad argument to the -s flag."); 411 break; 412 case 'b': /* BIOS geometry */ 413 b_flag = 1; 414 if (sscanf(optarg, "%d/%d/%d%n", &b_cyl, &b_head, 415 &b_sec, &n) != 3 || optarg[n] != 0) 416 errx(1, "Bad argument to the -b flag."); 417 if (b_cyl > MAXCYL) 418 b_cyl = MAXCYL; 419 break; 420 case 'A': /* Partition alignment[/offset] */ 421 if (sscanf(optarg, "%u%n/%u%n", &ptn_alignment, 422 &n, &ptn_0_offset, &n) < 1 423 || optarg[n] != 0 424 || ptn_0_offset > ptn_alignment) 425 errx(1, "Bad argument to the -A flag."); 426 if (ptn_0_offset == 0) 427 ptn_0_offset = ptn_alignment; 428 break; 429 case 'c': /* file/directory containing boot code */ 430 if (strchr(optarg, '/') != NULL && 431 stat(optarg, &sb) == 0 && 432 (sb.st_mode & S_IFMT) == S_IFDIR) { 433 boot_dir = optarg; 434 break; 435 } 436 bootsize = read_boot(optarg, bootcode, 437 sizeof bootcode, 1); 438 i_flag = 1; 439 break; 440 case 'r': /* read data from disk_file (not raw disk) */ 441 rfd = &wfd; 442 /* FALLTHROUGH */ 443 case 'w': /* write data to disk_file */ 444 disk_file = optarg; 445 break; 446 case 't': 447 if (setdisktab(optarg) == -1) 448 errx(EXIT_FAILURE, "bad disktab"); 449 break; 450 case 'T': 451 disk_type = optarg; 452 break; 453 default: 454 usage(); 455 } 456 } 457 argc -= optind; 458 argv += optind; 459 460 if (disk_type != NULL && getdiskbyname(disk_type) == NULL) 461 errx(EXIT_FAILURE, "bad disktype"); 462 463 if (sh_flag && (a_flag || i_flag || u_flag || f_flag || s_flag)) 464 usage(); 465 466 if (B_flag && f_flag) { 467 warnx("Bootselector may only be configured interactively"); 468 usage(); 469 } 470 471 if (f_flag && u_flag && !s_flag) { 472 warnx("Partition data not specified"); 473 usage(); 474 } 475 476 if (s_flag && partition == -1) { 477 warnx("-s flag requires a partition selected."); 478 usage(); 479 } 480 481 if (argc > 1) 482 usage(); 483 484 if (argc > 0) 485 disk = argv[0]; 486 else if (!F_flag) { 487 /* Default to boot device */ 488 initvar_disk(&disk); 489 } 490 491 if (!F_flag && stat(disk, &sb) == 0 && S_ISREG(sb.st_mode)) 492 F_flag = 1; 493 494 if (open_disk(B_flag || a_flag || i_flag || u_flag) < 0) 495 exit(1); 496 497 if (read_s0(0, &mboot)) 498 /* must have been a blank disk */ 499 init_sector0(1); 500 501 read_gpt(GPT_HDR_BLKNO, &gpt1); 502 read_gpt(disksectors - 1, &gpt2); 503 504 if (b_flag) { 505 dos_cylinders = b_cyl; 506 dos_heads = b_head; 507 dos_sectors = b_sec; 508 } else { 509 get_bios_geometry(); 510 } 511 512 if (ptn_alignment == 0) 513 get_ptn_alignmemt(); 514 515 get_extended_ptn(); 516 517 #ifdef BOOTSEL 518 default_ptn = get_default_boot(); 519 #endif 520 521 if (E_flag && !u_flag && partition >= ext.num_ptn) 522 errx(1, "Extended partition %d is not defined.", partition); 523 524 /* Do the update stuff! */ 525 if (u_flag) { 526 if (!f_flag && !b_flag) 527 change_bios_geometry(); 528 529 if (s_flag) 530 change_part(E_flag, partition, csysid, cstart, csize, 531 cbootmenu); 532 else { 533 int part = partition, chg_ext = E_flag, prompt = 1; 534 do { 535 if (prompt) { 536 printf("\n"); 537 print_s0(partition); 538 } 539 if (partition == -1) 540 part = ptn_id( 541 "Which partition do you want to change?", 542 &chg_ext); 543 if (part < 0) 544 break; 545 prompt = change_part(chg_ext, part, 0, 0, 0, 0); 546 } while (partition == -1); 547 } 548 } else { 549 if (!i_flag && !B_flag) { 550 print_geometry(); 551 print_s0(partition); 552 } 553 } 554 555 if (a_flag && !E_flag) 556 change_active(partition); 557 558 #ifdef BOOTSEL 559 if (B_flag || u_flag || i_flag) 560 /* Ensure the mbr code supports this configuration */ 561 install_bootsel(0); 562 if (B_flag) 563 default_ptn = configure_bootsel(default_ptn); 564 set_default_boot(default_ptn); 565 #else 566 if (i_flag) 567 init_sector0(0); 568 #endif 569 570 if (u_flag || a_flag || i_flag || B_flag) { 571 if (!f_flag) { 572 printf("\nWe haven't written the MBR back to disk " 573 "yet. This is your last chance.\n"); 574 if (u_flag) 575 print_s0(-1); 576 if (gpt1.hdr_size != 0 || gpt2.hdr_size != 0) 577 printf("\nWARNING: The disk is carrying " 578 "GUID Partition Tables.\n" 579 " If you continue, " 580 "GPT headers will be deleted.\n\n"); 581 if (yesno("Should we write new partition table?")) { 582 delete_gpt(&gpt1); 583 delete_gpt(&gpt2); 584 write_mbr(); 585 } 586 } else { 587 if (delete_gpt(&gpt1) > 0) 588 warnx("Primary GPT header was deleted"); 589 if (delete_gpt(&gpt2) > 0) 590 warnx("Secondary GPT header was deleted"); 591 write_mbr(); 592 } 593 } 594 595 exit(0); 596 } 597 598 static void 599 usage(void) 600 { 601 int indent = 7 + (int)strlen(getprogname()) + 1; 602 603 (void)fprintf(stderr, "usage: %s [-afiluvBS] " 604 "[-A ptn_alignment[/ptn_0_offset]] \\\n" 605 "%*s[-b cylinders/heads/sectors] \\\n" 606 "%*s[-0123 | -E num " 607 "[-s id/start/size[/bootmenu]]] \\\n" 608 "%*s[-t disktab] [-T disktype] \\\n" 609 "%*s[-c bootcode] " 610 "[-r|-w file] [device]\n" 611 "\t-a change active partition\n" 612 "\t-f force - not interactive\n" 613 "\t-i initialise MBR code\n" 614 "\t-l list partition types\n" 615 "\t-u update partition data\n" 616 "\t-v verbose output, -v -v more verbose still\n" 617 "\t-B update bootselect options\n" 618 "\t-F treat device as a regular file\n" 619 "\t-S output as shell defines\n" 620 "\t-r and -w access 'file' for non-destructive testing\n", 621 getprogname(), indent, "", indent, "", indent, "", indent, ""); 622 exit(1); 623 } 624 625 static daddr_t 626 ext_offset(int part) 627 { 628 daddr_t offset = ext.base; 629 630 if (part != 0) 631 offset += le32toh(ext.ptn[part - 1].mbr_parts[1].mbrp_start); 632 return offset; 633 } 634 635 static void 636 print_s0(int which) 637 { 638 int part; 639 640 if (which == -1) { 641 if (!sh_flag) 642 printf("Partition table:\n"); 643 for (part = 0; part < MBR_PART_COUNT; part++) { 644 if (!sh_flag) 645 printf("%d: ", part); 646 print_part(&mboot, part, 0); 647 } 648 if (!sh_flag) { 649 if (ext.is_corrupt) 650 printf("Extended partition table is corrupt\n"); 651 else 652 if (ext.num_ptn != 0) 653 printf("Extended partition table:\n"); 654 } 655 for (part = 0; part < ext.num_ptn; part++) { 656 if (!sh_flag) 657 printf("E%d: ", part); 658 print_part(&ext.ptn[part], 0, ext_offset(part)); 659 if (!sh_flag && v_flag >= 2) { 660 printf("link: "); 661 print_mbr_partition(&ext.ptn[part], 1, 662 ext_offset(part), ext.base, 0); 663 } 664 } 665 #ifdef BOOTSEL 666 if (!sh_flag && mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 667 int tmo; 668 669 printf("Bootselector "); 670 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ACTIVE) { 671 printf("enabled"); 672 tmo = le16toh(mboot.mbr_bootsel.mbrbs_timeo); 673 if (tmo == 0xffff) 674 printf(", infinite timeout"); 675 else 676 printf(", timeout %d seconds", 677 (10 * tmo + 9) / 182); 678 } else 679 printf("disabled"); 680 printf(".\n"); 681 } 682 #endif 683 if (!sh_flag) { 684 int active = first_active(); 685 if (active == MBR_PART_COUNT) 686 printf("No active partition.\n"); 687 else 688 printf("First active partition: %d\n", active); 689 } 690 if (!sh_flag && mboot.mbr_dsn != 0) 691 printf("Drive serial number: %"PRIu32" (0x%08x)\n", 692 le32toh(mboot.mbr_dsn), 693 le32toh(mboot.mbr_dsn)); 694 return; 695 } 696 697 if (E_flag) { 698 if (!sh_flag) 699 printf("Extended partition E%d:\n", which); 700 if (which > ext.num_ptn) 701 printf("Undefined\n"); 702 else 703 print_part(&ext.ptn[which], 0, ext_offset(which)); 704 } else { 705 if (!sh_flag) 706 printf("Partition %d:\n", which); 707 print_part(&mboot, which, 0); 708 } 709 } 710 711 static void 712 print_part(struct mbr_sector *boot, int part, daddr_t offset) 713 { 714 struct mbr_partition *partp; 715 const char *e; 716 717 if (!sh_flag) { 718 print_mbr_partition(boot, part, offset, 0, 0); 719 return; 720 } 721 722 partp = &boot->mbr_parts[part]; 723 if (boot != &mboot) { 724 part = boot - ext.ptn; 725 e = "E"; 726 } else 727 e = ""; 728 729 if (partp->mbrp_type == 0) { 730 printf("PART%s%dSIZE=0\n", e, part); 731 return; 732 } 733 734 printf("PART%s%dID=%d\n", e, part, partp->mbrp_type); 735 printf("PART%s%dSIZE=%u\n", e, part, le32toh(partp->mbrp_size)); 736 printf("PART%s%dSTART=%"PRIdaddr"\n", e, part, 737 offset + le32toh(partp->mbrp_start)); 738 printf("PART%s%dFLAG=0x%x\n", e, part, partp->mbrp_flag); 739 printf("PART%s%dBCYL=%d\n", e, part, 740 MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect)); 741 printf("PART%s%dBHEAD=%d\n", e, part, partp->mbrp_shd); 742 printf("PART%s%dBSEC=%d\n", e, part, MBR_PSECT(partp->mbrp_ssect)); 743 printf("PART%s%dECYL=%d\n", e, part, 744 MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect)); 745 printf("PART%s%dEHEAD=%d\n", e, part, partp->mbrp_ehd); 746 printf("PART%s%dESEC=%d\n", e, part, MBR_PSECT(partp->mbrp_esect)); 747 } 748 749 static void 750 pr_cyls(daddr_t sector, int is_end) 751 { 752 unsigned long cyl, head, sect; 753 cyl = sector / dos_cylindersectors; 754 sect = sector - cyl * dos_cylindersectors; 755 head = sect / dos_sectors; 756 sect -= head * dos_sectors; 757 758 printf("%lu", cyl); 759 760 if (is_end) { 761 if (head == dos_heads - 1 && sect == dos_sectors - 1) 762 return; 763 } else { 764 if (head == 0 && sect == 0) 765 return; 766 } 767 768 printf("/%lu/%lu", head, sect + 1); 769 } 770 771 static void 772 print_mbr_partition(struct mbr_sector *boot, int part, 773 daddr_t offset, daddr_t exoffset, int indent) 774 { 775 daddr_t start; 776 daddr_t size; 777 struct mbr_partition *partp = &boot->mbr_parts[part]; 778 struct mbr_sector eboot; 779 int p; 780 static int dumped = 0; 781 782 if (partp->mbrp_type == 0 && v_flag < 2) { 783 printf("<UNUSED>\n"); 784 return; 785 } 786 787 start = le32toh(partp->mbrp_start); 788 size = le32toh(partp->mbrp_size); 789 if (MBR_IS_EXTENDED(partp->mbrp_type)) 790 start += exoffset; 791 else 792 start += offset; 793 794 printf("%s (sysid %d)\n", get_type(partp->mbrp_type), partp->mbrp_type); 795 #ifdef BOOTSEL 796 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC && 797 boot->mbr_bootsel.mbrbs_nametab[part][0]) 798 printf("%*s bootmenu: %s\n", indent, "", 799 boot->mbr_bootsel.mbrbs_nametab[part]); 800 #endif 801 802 printf("%*s start %"PRIdaddr", size %"PRIdaddr, 803 indent, "", start, size); 804 if (size != 0) { 805 printf(" (%u MB, Cyls ", SEC_TO_MB(size)); 806 if (v_flag == 0 && le32toh(partp->mbrp_start) == ptn_0_offset) 807 pr_cyls(start - ptn_0_offset, 0); 808 else 809 pr_cyls(start, 0); 810 printf("-"); 811 pr_cyls(start + size - 1, 1); 812 printf(")"); 813 } 814 815 switch (partp->mbrp_flag) { 816 case 0: 817 break; 818 case MBR_PFLAG_ACTIVE: 819 printf(", Active"); 820 break; 821 default: 822 printf(", flag 0x%x", partp->mbrp_flag); 823 break; 824 } 825 printf("\n"); 826 827 if (v_flag) { 828 printf("%*s beg: cylinder %4d, head %3d, sector %2d\n", 829 indent, "", 830 MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect), 831 partp->mbrp_shd, MBR_PSECT(partp->mbrp_ssect)); 832 printf("%*s end: cylinder %4d, head %3d, sector %2d\n", 833 indent, "", 834 MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect), 835 partp->mbrp_ehd, MBR_PSECT(partp->mbrp_esect)); 836 } 837 838 if (partp->mbrp_type == 0 && start == 0 && v_flag < 3) 839 return; 840 841 if (! MBR_IS_EXTENDED(partp->mbrp_type)) 842 print_pbr(start, indent + 8, partp->mbrp_type); 843 844 if (!MBR_IS_EXTENDED(partp->mbrp_type) || 845 (v_flag <= 2 && !ext.is_corrupt)) 846 return; 847 848 /* 849 * Recursive dump extended table, 850 * This is read from the disk - so is wrong during editing. 851 * Just ensure we only show it once. 852 */ 853 if (dumped) 854 return; 855 856 printf("%*s Extended partition table:\n", indent, ""); 857 indent += 4; 858 if (read_s0(start, &eboot) == -1) 859 return; 860 for (p = 0; p < MBR_PART_COUNT; p++) { 861 printf("%*s%d: ", indent, "", p); 862 print_mbr_partition(&eboot, p, start, 863 exoffset ? exoffset : start, indent); 864 } 865 866 if (exoffset == 0) 867 dumped = 1; 868 } 869 870 /* Print a line with a label and a vis-encoded string */ 871 static void 872 printvis(int indent, const char *label, const char *buf, size_t size) 873 { 874 char *visbuf; 875 876 if ((visbuf = malloc(size * 4 + 1)) == NULL) 877 err(1, "Malloc failed"); 878 strsvisx(visbuf, buf, size, VIS_TAB|VIS_NL|VIS_OCTAL, "\""); 879 printf("%*s%s: \"%s\"\n", 880 indent, "", 881 label, visbuf); 882 free(visbuf); 883 } 884 885 /* Check whether a buffer contains all bytes zero */ 886 static int 887 is_all_zero(const unsigned char *p, size_t size) 888 { 889 890 while (size-- > 0) { 891 if (*p++ != 0) 892 return 0; 893 } 894 return 1; 895 } 896 897 /* 898 * Report on the contents of a PBR sector. 899 * 900 * We first perform several sanity checks. If vflag >= 2, we report all 901 * failing tests, but for smaller values of v_flag we stop after the 902 * first failing test. Tests are ordered in an attempt to get the most 903 * useful error message from the first failing test. 904 * 905 * If v_flag >= 2, we also report some decoded values from the PBR. 906 * These results may be meaningless, if the PBR doesn't follow common 907 * conventions. 908 * 909 * Trying to decode anything more than the magic number in the last 910 * two bytes is a layering violation, but it can be very useful in 911 * diagnosing boot failures. 912 */ 913 static void 914 print_pbr(daddr_t sector, int indent, uint8_t part_type) 915 { 916 struct mbr_sector pboot; 917 unsigned char *p, *endp; 918 unsigned char val; 919 int ok; 920 int errcount = 0; 921 922 #define PBR_ERROR(...) \ 923 do { \ 924 ++errcount; \ 925 printf("%*s%s: ", indent, "", \ 926 (v_flag < 2 ? "PBR is not bootable" : "Not bootable")); \ 927 printf(__VA_ARGS__); \ 928 if (v_flag < 2) \ 929 return; \ 930 } while (/*CONSTCOND*/ 0) 931 932 if (v_flag >= 2) { 933 printf("%*sInformation from PBR:\n", 934 indent, ""); 935 indent += 4; 936 } 937 938 if (read_disk(sector, &pboot) == -1) { 939 PBR_ERROR("Sector %"PRIdaddr" is unreadable (%s)\n", 940 sector, strerror(errno)); 941 return; 942 } 943 944 /* all bytes identical? */ 945 p = (unsigned char *)&pboot; 946 endp = p + sizeof(pboot); 947 val = *p; 948 ok = 0; 949 for (; p < endp; p++) { 950 if (*p != val) { 951 ok = 1; 952 break; 953 } 954 } 955 if (! ok) 956 PBR_ERROR("All bytes are identical (0x%02x)\n", val); 957 958 if (pboot.mbr_magic != LE_MBR_MAGIC) 959 PBR_ERROR("Bad magic number (0x%04x)\n", 960 le16toh(pboot.mbr_magic)); 961 962 #if 0 963 /* Some i386 OS might fail this test. All non-i386 will fail. */ 964 if (pboot.mbr_jmpboot[0] != 0xE9 965 && pboot.mbr_jmpboot[0] != 0xEB) { 966 PBR_ERROR("Does not begin with i386 JMP instruction" 967 " (0x%02x 0x%02x0 0x%02x)\n", 968 pboot.mbr_jmpboot[0], pboot.mbr_jmpboot[1], 969 pboot.mbr_jmpboot[2]); 970 } 971 #endif 972 973 if (v_flag > 0 && errcount == 0) 974 printf("%*sPBR appears to be bootable\n", 975 indent, ""); 976 if (v_flag < 2) 977 return; 978 979 if (! is_all_zero(pboot.mbr_oemname, sizeof(pboot.mbr_oemname))) { 980 printvis(indent, "OEM name", (char *)pboot.mbr_oemname, 981 sizeof(pboot.mbr_oemname)); 982 } 983 984 if (pboot.mbr_bpb.bpb16.bsBootSig == 0x29) 985 printf("%*sBPB FAT16 boot signature found\n", 986 indent, ""); 987 if (pboot.mbr_bpb.bpb32.bsBootSig == 0x29) 988 printf("%*sBPB FAT32 boot signature found\n", 989 indent, ""); 990 991 #undef PBR_ERROR 992 } 993 994 static int 995 read_boot(const char *name, void *buf, size_t len, int err_exit) 996 { 997 int bfd, ret; 998 struct stat st; 999 1000 if (boot_path != NULL) 1001 free(boot_path); 1002 if (strchr(name, '/') == 0) 1003 asprintf(&boot_path, "%s/%s", boot_dir, name); 1004 else 1005 boot_path = strdup(name); 1006 if (boot_path == NULL) 1007 err(1, "Malloc failed"); 1008 1009 if ((bfd = open(boot_path, O_RDONLY)) < 0 || fstat(bfd, &st) == -1) { 1010 warn("%s", boot_path); 1011 goto fail; 1012 } 1013 1014 if (st.st_size > (off_t)len) { 1015 warnx("%s: bootcode too large", boot_path); 1016 goto fail; 1017 } 1018 ret = st.st_size; 1019 if (ret < 0x200) { 1020 warnx("%s: bootcode too small", boot_path); 1021 goto fail; 1022 } 1023 if (read(bfd, buf, len) != ret) { 1024 warn("%s", boot_path); 1025 goto fail; 1026 } 1027 1028 /* 1029 * Do some sanity checking here 1030 */ 1031 if (((struct mbr_sector *)buf)->mbr_magic != LE_MBR_MAGIC) { 1032 warnx("%s: invalid magic", boot_path); 1033 goto fail; 1034 } 1035 1036 close(bfd); 1037 ret = (ret + 0x1ff) & ~0x1ff; 1038 return ret; 1039 1040 fail: 1041 if (bfd >= 0) 1042 close(bfd); 1043 if (err_exit) 1044 exit(1); 1045 return 0; 1046 } 1047 1048 static void 1049 init_sector0(int zappart) 1050 { 1051 int i; 1052 int copy_size = offsetof(struct mbr_sector, mbr_dsn); 1053 1054 #ifdef DEFAULT_BOOTCODE 1055 if (bootsize == 0) 1056 bootsize = read_boot(DEFAULT_BOOTCODE, bootcode, 1057 sizeof bootcode, 0); 1058 #endif 1059 #ifdef BOOTSEL 1060 if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC 1061 && bootcode[0].mbr_bootsel_magic == LE_MBR_BS_MAGIC) 1062 copy_size = MBR_BS_OFFSET; 1063 #endif 1064 1065 if (bootsize != 0) { 1066 boot_installed = 1; 1067 memcpy(&mboot, bootcode, copy_size); 1068 mboot.mbr_bootsel_magic = bootcode[0].mbr_bootsel_magic; 1069 } 1070 mboot.mbr_magic = LE_MBR_MAGIC; 1071 1072 if (!zappart) 1073 return; 1074 for (i = 0; i < MBR_PART_COUNT; i++) 1075 memset(&mboot.mbr_parts[i], 0, sizeof(mboot.mbr_parts[i])); 1076 } 1077 1078 static void 1079 get_extended_ptn(void) 1080 { 1081 struct mbr_partition *mp; 1082 struct mbr_sector *boot; 1083 daddr_t offset; 1084 struct mbr_sector *nptn; 1085 1086 /* find first (there should only be one) extended partition */ 1087 for (mp = mboot.mbr_parts; !MBR_IS_EXTENDED(mp->mbrp_type); mp++) 1088 if (mp >= &mboot.mbr_parts[MBR_PART_COUNT]) 1089 return; 1090 1091 /* 1092 * The extended partition should be structured as a linked list 1093 * (even though it appears, at first glance, to be a tree). 1094 */ 1095 ext.base = le32toh(mp->mbrp_start); 1096 ext.limit = ext.base + le32toh(mp->mbrp_size); 1097 ext.ptn_id = mp - mboot.mbr_parts; 1098 for (offset = 0;; offset = le32toh(boot->mbr_parts[1].mbrp_start)) { 1099 nptn = realloc(ext.ptn, (ext.num_ptn + 1) * sizeof *ext.ptn); 1100 if (nptn == NULL) 1101 err(1, "Malloc failed"); 1102 ext.ptn = nptn; 1103 boot = ext.ptn + ext.num_ptn; 1104 if (read_s0(offset + ext.base, boot) == -1) 1105 break; 1106 /* expect p0 to be valid and p1 to be another extended ptn */ 1107 if (MBR_IS_EXTENDED(boot->mbr_parts[0].mbrp_type)) 1108 break; 1109 if (boot->mbr_parts[1].mbrp_type != 0 && 1110 !MBR_IS_EXTENDED(boot->mbr_parts[1].mbrp_type)) 1111 break; 1112 /* p2 and p3 should be unallocated */ 1113 if (boot->mbr_parts[2].mbrp_type != 0 || 1114 boot->mbr_parts[3].mbrp_type != 0) 1115 break; 1116 /* data ptn inside extended one */ 1117 if (boot->mbr_parts[0].mbrp_type != 0 && 1118 offset + le32toh(boot->mbr_parts[0].mbrp_start) 1119 + le32toh(boot->mbr_parts[0].mbrp_size) > ext.limit) 1120 break; 1121 1122 ext.num_ptn++; 1123 1124 if (boot->mbr_parts[1].mbrp_type == 0) 1125 /* end of extended partition chain */ 1126 return; 1127 /* must be in sector order */ 1128 if (offset >= le32toh(boot->mbr_parts[1].mbrp_start)) 1129 break; 1130 } 1131 1132 warnx("Extended partition table is corrupt\n"); 1133 ext.is_corrupt = 1; 1134 ext.num_ptn = 0; 1135 } 1136 1137 #if defined(USE_DISKLIST) 1138 static void 1139 get_diskname(const char *fullname, char *diskname, size_t size) 1140 { 1141 const char *p, *p2; 1142 size_t len; 1143 1144 p = strrchr(fullname, '/'); 1145 if (p == NULL) 1146 p = fullname; 1147 else 1148 p++; 1149 1150 if (*p == 0) { 1151 strlcpy(diskname, fullname, size); 1152 return; 1153 } 1154 1155 if (*p == 'r') 1156 p++; 1157 1158 for (p2 = p; *p2 != 0; p2++) 1159 if (isdigit((unsigned char)*p2)) 1160 break; 1161 if (*p2 == 0) { 1162 /* XXX invalid diskname? */ 1163 strlcpy(diskname, fullname, size); 1164 return; 1165 } 1166 while (isdigit((unsigned char)*p2)) 1167 p2++; 1168 1169 len = p2 - p; 1170 if (len > size) { 1171 /* XXX */ 1172 strlcpy(diskname, fullname, size); 1173 return; 1174 } 1175 1176 memcpy(diskname, p, len); 1177 diskname[len] = 0; 1178 } 1179 #endif 1180 1181 static void 1182 get_ptn_alignmemt(void) 1183 { 1184 struct mbr_partition *partp = &mboot.mbr_parts[0]; 1185 uint32_t ptn_0_base, ptn_0_limit; 1186 1187 /* Default to using 'traditional' cylinder alignment */ 1188 ptn_alignment = dos_cylindersectors; 1189 ptn_0_offset = dos_sectors; 1190 1191 if (partp->mbrp_type != 0) { 1192 /* Try to copy alignment of first partition */ 1193 ptn_0_base = le32toh(partp->mbrp_start); 1194 ptn_0_limit = ptn_0_base + le32toh(partp->mbrp_size); 1195 if (!(ptn_0_limit & 2047)) { 1196 /* Partition ends on a 1MB boundary, align to 1MB */ 1197 ptn_alignment = 2048; 1198 if (ptn_0_base <= 2048 1199 && !(ptn_0_base & (ptn_0_base - 1))) { 1200 /* ptn_base is a power of 2, use it */ 1201 ptn_0_offset = ptn_0_base; 1202 } 1203 } 1204 } else { 1205 /* Use 1MB alignment for large disks */ 1206 if (disksectors > 2048 * 1024 * 128) { 1207 ptn_alignment = 2048; 1208 ptn_0_offset = 2048; 1209 } 1210 } 1211 } 1212 1213 static void 1214 get_bios_geometry(void) 1215 { 1216 #if defined(USE_DISKLIST) 1217 int mib[2], i; 1218 size_t len; 1219 struct biosdisk_info *bip; 1220 struct nativedisk_info *nip; 1221 char diskname[8]; 1222 1223 mib[0] = CTL_MACHDEP; 1224 mib[1] = CPU_DISKINFO; 1225 if (sysctl(mib, 2, NULL, &len, NULL, 0) < 0) { 1226 goto out; 1227 } 1228 dl = (struct disklist *) malloc(len); 1229 if (dl == NULL) 1230 err(1, "Malloc failed"); 1231 if (sysctl(mib, 2, dl, &len, NULL, 0) < 0) { 1232 free(dl); 1233 dl = 0; 1234 goto out; 1235 } 1236 1237 get_diskname(disk, diskname, sizeof diskname); 1238 1239 for (i = 0; i < dl->dl_nnativedisks; i++) { 1240 nip = &dl->dl_nativedisks[i]; 1241 if (strcmp(diskname, nip->ni_devname)) 1242 continue; 1243 /* 1244 * XXX listing possible matches is better. This is ok for 1245 * now because the user has a chance to change it later. 1246 * Also, if all the disks have the same parameters then we can 1247 * just use them, we don't need to know which disk is which. 1248 */ 1249 if (nip->ni_nmatches != 0) { 1250 bip = &dl->dl_biosdisks[nip->ni_biosmatches[0]]; 1251 dos_cylinders = bip->bi_cyl; 1252 dos_heads = bip->bi_head; 1253 dos_sectors = bip->bi_sec; 1254 if (bip->bi_lbasecs) 1255 dos_disksectors = bip->bi_lbasecs; 1256 return; 1257 } 1258 } 1259 out: 1260 #endif 1261 /* Allright, allright, make a stupid guess.. */ 1262 intuit_translated_geometry(); 1263 } 1264 1265 #ifdef BOOTSEL 1266 static daddr_t 1267 get_default_boot(void) 1268 { 1269 unsigned int id; 1270 int p; 1271 1272 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1273 /* default to first active partition */ 1274 return DEFAULT_ACTIVE; 1275 1276 id = mboot.mbr_bootsel.mbrbs_defkey; 1277 1278 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII) { 1279 /* Keycode is ascii */ 1280 if (id == '\r') 1281 return DEFAULT_ACTIVE; 1282 /* '1'+ => allocated partition id, 'a'+ => disk 0+ */ 1283 if (id >= 'a' && id < 'a' + MAX_BIOS_DISKS) 1284 return DEFAULT_DISK(id - 'a'); 1285 id -= '1'; 1286 } else { 1287 /* keycode is PS/2 keycode */ 1288 if (id == SCAN_ENTER) 1289 return DEFAULT_ACTIVE; 1290 /* 1+ => allocated partition id, F1+ => disk 0+ */ 1291 if (id >= SCAN_F1 && id < SCAN_F1 + MAX_BIOS_DISKS) 1292 return DEFAULT_DISK(id - SCAN_F1); 1293 id -= SCAN_1; 1294 } 1295 1296 /* Convert partition index to the invariant start sector number */ 1297 1298 for (p = 0; p < MBR_PART_COUNT; p++) { 1299 if (mboot.mbr_parts[p].mbrp_type == 0) 1300 continue; 1301 if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0) 1302 continue; 1303 if (id-- == 0) 1304 return le32toh(mboot.mbr_parts[p].mbrp_start); 1305 } 1306 1307 for (p = 0; p < ext.num_ptn; p++) { 1308 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1309 continue; 1310 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1311 continue; 1312 if (id-- == 0) 1313 return ext_offset(p) 1314 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start); 1315 } 1316 1317 return DEFAULT_ACTIVE; 1318 } 1319 1320 static void 1321 set_default_boot(daddr_t default_ptn) 1322 { 1323 int p; 1324 static const unsigned char key_list[] = { SCAN_ENTER, SCAN_F1, SCAN_1, 1325 '\r', 'a', '1' }; 1326 const unsigned char *key = key_list; 1327 1328 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1329 /* sanity */ 1330 return; 1331 1332 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII) 1333 /* Use ascii values */ 1334 key += 3; 1335 1336 if (default_ptn == DEFAULT_ACTIVE) { 1337 mboot.mbr_bootsel.mbrbs_defkey = key[0]; 1338 return; 1339 } 1340 1341 if (default_ptn >= DEFAULT_DISK(0) 1342 && default_ptn < DEFAULT_DISK(MAX_BIOS_DISKS)) { 1343 mboot.mbr_bootsel.mbrbs_defkey = key[1] 1344 + default_ptn - DEFAULT_DISK(0); 1345 return; 1346 } 1347 1348 mboot.mbr_bootsel.mbrbs_defkey = key[2]; 1349 for (p = 0; p < MBR_PART_COUNT; p++) { 1350 if (mboot.mbr_parts[p].mbrp_type == 0) 1351 continue; 1352 if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0) 1353 continue; 1354 if (le32toh(mboot.mbr_parts[p].mbrp_start) == default_ptn) 1355 return; 1356 mboot.mbr_bootsel.mbrbs_defkey++; 1357 } 1358 1359 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_EXTLBA) { 1360 for (p = 0; p < ext.num_ptn; p++) { 1361 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1362 continue; 1363 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1364 continue; 1365 if (le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) + 1366 ext_offset(p) == default_ptn) 1367 return; 1368 mboot.mbr_bootsel.mbrbs_defkey++; 1369 } 1370 } 1371 1372 /* Default to first active partition */ 1373 mboot.mbr_bootsel.mbrbs_defkey = key[0]; 1374 } 1375 1376 static void 1377 install_bootsel(int needed) 1378 { 1379 struct mbr_bootsel *mbs = &mboot.mbr_bootsel; 1380 int p; 1381 int ext13 = 0; 1382 const char *code; 1383 1384 needed |= MBR_BS_NEWMBR; /* need new bootsel code */ 1385 1386 /* Work out which boot code we need for this configuration */ 1387 for (p = 0; p < MBR_PART_COUNT; p++) { 1388 if (mboot.mbr_parts[p].mbrp_type == 0) 1389 continue; 1390 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1391 break; 1392 if (mbs->mbrbs_nametab[p][0] == 0) 1393 continue; 1394 needed |= MBR_BS_ACTIVE; 1395 if (le32toh(mboot.mbr_parts[p].mbrp_start) >= dos_totalsectors) 1396 ext13 = MBR_BS_EXTINT13; 1397 } 1398 1399 for (p = 0; p < ext.num_ptn; p++) { 1400 if (ext.ptn[p].mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1401 continue; 1402 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1403 continue; 1404 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[p][0] == 0) 1405 continue; 1406 needed |= MBR_BS_EXTLBA | MBR_BS_ACTIVE; 1407 } 1408 1409 if (B_flag) 1410 needed |= MBR_BS_ACTIVE; 1411 1412 /* Is the installed code good enough ? */ 1413 if (!i_flag && (needed == 0 || 1414 (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC 1415 && (mbs->mbrbs_flags & needed) == needed))) { 1416 /* yes - just set flags */ 1417 mbs->mbrbs_flags |= ext13; 1418 return; 1419 } 1420 1421 /* ok - we need to replace the bootcode */ 1422 1423 if (f_flag && !(i_flag || B_flag)) { 1424 warnx("Installed bootfile doesn't support required options."); 1425 return; 1426 } 1427 1428 if (!f_flag && bootsize == 0 && !i_flag) 1429 /* Output an explanation for the 'update bootcode' prompt. */ 1430 printf("\n%s\n", 1431 "Installed bootfile doesn't support required options."); 1432 1433 /* Were we told a specific file ? (which we have already read) */ 1434 /* If so check that it supports what we need. */ 1435 if (bootsize != 0 && needed != 0 1436 && (bootcode[0].mbr_bootsel_magic != LE_MBR_BS_MAGIC 1437 || ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed))) { 1438 /* No it doesn't... */ 1439 if (f_flag) 1440 warnx("Bootfile %s doesn't support " 1441 "required bootsel options", boot_path ); 1442 /* But install it anyway */ 1443 else 1444 if (yesno("Bootfile %s doesn't support the required " 1445 "options,\ninstall default bootfile instead?", 1446 boot_path)) 1447 bootsize = 0; 1448 } 1449 1450 if (bootsize == 0) { 1451 /* Get name of bootfile that supports the required facilities */ 1452 code = DEFAULT_BOOTCODE; 1453 if (needed & MBR_BS_ACTIVE) 1454 code = DEFAULT_BOOTSELCODE; 1455 #ifdef DEFAULT_BOOTEXTCODE 1456 if (needed & MBR_BS_EXTLBA) 1457 code = DEFAULT_BOOTEXTCODE; 1458 #endif 1459 1460 bootsize = read_boot(code, bootcode, sizeof bootcode, 0); 1461 if (bootsize == 0) 1462 /* The old bootcode is better than no bootcode at all */ 1463 return; 1464 if ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed) 1465 warnx("Default bootfile %s doesn't support required " 1466 "options. Got flags 0x%x, wanted 0x%x\n", 1467 boot_path, bootcode[0].mbr_bootsel.mbrbs_flags, 1468 needed); 1469 } 1470 1471 if (!f_flag && !yesno("Update the bootcode from %s?", boot_path)) 1472 return; 1473 1474 init_sector0(0); 1475 1476 if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC) 1477 mbs->mbrbs_flags = bootcode[0].mbr_bootsel.mbrbs_flags | ext13; 1478 } 1479 1480 static daddr_t 1481 configure_bootsel(daddr_t default_ptn) 1482 { 1483 struct mbr_bootsel *mbs = &mboot.mbr_bootsel; 1484 int i, item, opt; 1485 int tmo; 1486 daddr_t *off; 1487 int num_bios_disks; 1488 1489 #if defined(USE_DISKLIST) 1490 if (dl != NULL) { 1491 num_bios_disks = dl->dl_nbiosdisks; 1492 if (num_bios_disks > MAX_BIOS_DISKS) 1493 num_bios_disks = MAX_BIOS_DISKS; 1494 } else 1495 #endif 1496 num_bios_disks = MAX_BIOS_DISKS; 1497 1498 printf("\nBoot selector configuration:\n"); 1499 1500 /* The timeout value is in ticks, ~18.2 Hz. Avoid using floats. 1501 * Ticks are nearly 64k/3600 - so our long timers are sligtly out! 1502 * Newer bootcode always waits for 1 tick, so treats 0xffff 1503 * as wait forever. 1504 */ 1505 tmo = le16toh(mbs->mbrbs_timeo); 1506 tmo = tmo == 0xffff ? -1 : (10 * tmo + 9) / 182; 1507 tmo = decimal("Timeout value (0 to 3600 seconds, -1 => never)", 1508 tmo, 0, -1, 3600); 1509 mbs->mbrbs_timeo = htole16(tmo == -1 ? 0xffff : (tmo * 182) / 10); 1510 1511 off = calloc(1 + MBR_PART_COUNT + ext.num_ptn + num_bios_disks, sizeof *off); 1512 if (off == NULL) 1513 err(1, "Malloc failed"); 1514 1515 printf("Select the default boot option. Options are:\n\n"); 1516 item = 0; 1517 opt = 0; 1518 off[opt] = DEFAULT_ACTIVE; 1519 printf("%d: The first active partition\n", opt); 1520 for (i = 0; i < MBR_PART_COUNT; i++) { 1521 if (mboot.mbr_parts[i].mbrp_type == 0) 1522 continue; 1523 if (mbs->mbrbs_nametab[i][0] == 0) 1524 continue; 1525 printf("%d: %s\n", ++opt, &mbs->mbrbs_nametab[i][0]); 1526 off[opt] = le32toh(mboot.mbr_parts[i].mbrp_start); 1527 if (off[opt] == default_ptn) 1528 item = opt; 1529 } 1530 if (mbs->mbrbs_flags & MBR_BS_EXTLBA) { 1531 for (i = 0; i < ext.num_ptn; i++) { 1532 if (ext.ptn[i].mbr_parts[0].mbrp_type == 0) 1533 continue; 1534 if (ext.ptn[i].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1535 continue; 1536 printf("%d: %s\n", 1537 ++opt, ext.ptn[i].mbr_bootsel.mbrbs_nametab[0]); 1538 off[opt] = ext_offset(i) + 1539 le32toh(ext.ptn[i].mbr_parts[0].mbrp_start); 1540 if (off[opt] == default_ptn) 1541 item = opt; 1542 } 1543 } 1544 for (i = 0; i < num_bios_disks; i++) { 1545 printf("%d: Harddisk %d\n", ++opt, i); 1546 off[opt] = DEFAULT_DISK(i); 1547 if (DEFAULT_DISK(i) == default_ptn) 1548 item = opt; 1549 } 1550 1551 item = decimal("Default boot option", item, 0, 0, opt); 1552 1553 default_ptn = off[item]; 1554 free(off); 1555 return default_ptn; 1556 } 1557 #endif /* BOOTSEL */ 1558 1559 1560 /* Prerequisite: the disklabel parameters and master boot record must 1561 * have been read (i.e. dos_* and mboot are meaningful). 1562 * Specification: modifies dos_cylinders, dos_heads, dos_sectors, and 1563 * dos_cylindersectors to be consistent with what the 1564 * partition table is using, if we can find a geometry 1565 * which is consistent with all partition table entries. 1566 * We may get the number of cylinders slightly wrong (in 1567 * the conservative direction). The idea is to be able 1568 * to create a NetBSD partition on a disk we don't know 1569 * the translated geometry of. 1570 * This routine is only used for non-x86 systems or when we fail to 1571 * get the BIOS geometry from the kernel. 1572 */ 1573 static void 1574 intuit_translated_geometry(void) 1575 { 1576 uint32_t xcylinders; 1577 int xheads = -1, xsectors = -1, i, j; 1578 unsigned int c1, h1, s1, c2, h2, s2; 1579 unsigned long a1, a2; 1580 uint64_t num, denom; 1581 1582 /* 1583 * The physical parameters may be invalid as bios geometry. 1584 * If we cannot determine the actual bios geometry, we are 1585 * better off picking a likely 'faked' geometry than leaving 1586 * the invalid physical one. 1587 */ 1588 1589 if (dos_cylinders > MAXCYL || dos_heads > MAXHEAD || 1590 dos_sectors > MAXSECTOR) { 1591 h1 = MAXHEAD - 1; 1592 c1 = MAXCYL - 1; 1593 #if defined(USE_DISKLIST) 1594 if (dl != NULL) { 1595 /* BIOS may use 256 heads or 1024 cylinders */ 1596 for (i = 0; i < dl->dl_nbiosdisks; i++) { 1597 if (h1 < (unsigned int)dl->dl_biosdisks[i].bi_head) 1598 h1 = dl->dl_biosdisks[i].bi_head; 1599 if (c1 < (unsigned int)dl->dl_biosdisks[i].bi_cyl) 1600 c1 = dl->dl_biosdisks[i].bi_cyl; 1601 } 1602 } 1603 #endif 1604 dos_sectors = MAXSECTOR; 1605 dos_heads = h1; 1606 dos_cylinders = disklabel.d_secperunit / (MAXSECTOR * h1); 1607 if (dos_cylinders > c1) 1608 dos_cylinders = c1; 1609 } 1610 1611 /* Try to deduce the number of heads from two different mappings. */ 1612 for (i = 0; i < MBR_PART_COUNT * 2 - 1; i++) { 1613 if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) 1614 continue; 1615 a1 -= s1; 1616 for (j = i + 1; j < MBR_PART_COUNT * 2; j++) { 1617 if (get_mapping(j, &c2, &h2, &s2, &a2) < 0) 1618 continue; 1619 a2 -= s2; 1620 num = (uint64_t)h1 * a2 - (uint64_t)h2 * a1; 1621 denom = (uint64_t)c2 * a1 - (uint64_t)c1 * a2; 1622 if (denom != 0 && num != 0 && num % denom == 0) { 1623 xheads = num / denom; 1624 xsectors = a1 / (c1 * xheads + h1); 1625 break; 1626 } 1627 } 1628 if (xheads != -1) 1629 break; 1630 } 1631 1632 if (xheads == -1) { 1633 warnx("Cannot determine the number of heads"); 1634 return; 1635 } 1636 1637 if (xsectors == -1) { 1638 warnx("Cannot determine the number of sectors"); 1639 return; 1640 } 1641 1642 /* Estimate the number of cylinders. */ 1643 xcylinders = disklabel.d_secperunit / xheads / xsectors; 1644 if (disklabel.d_secperunit > xcylinders * xheads * xsectors) 1645 xcylinders++; 1646 1647 /* 1648 * Now verify consistency with each of the partition table entries. 1649 * Be willing to shove cylinders up a little bit to make things work, 1650 * but translation mismatches are fatal. 1651 */ 1652 for (i = 0; i < MBR_PART_COUNT * 2; i++) { 1653 if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) 1654 continue; 1655 if (c1 >= MAXCYL - 2) 1656 continue; 1657 if (xsectors * (c1 * xheads + h1) + s1 != a1) 1658 return; 1659 } 1660 1661 1662 /* Everything checks out. 1663 * Reset the geometry to use for further calculations. 1664 * But cylinders cannot be > 1024. 1665 */ 1666 if (xcylinders > MAXCYL) 1667 dos_cylinders = MAXCYL; 1668 else 1669 dos_cylinders = xcylinders; 1670 dos_heads = xheads; 1671 dos_sectors = xsectors; 1672 } 1673 1674 /* 1675 * For the purposes of intuit_translated_geometry(), treat the partition 1676 * table as a list of eight mapping between (cylinder, head, sector) 1677 * triplets and absolute sectors. Get the relevant geometry triplet and 1678 * absolute sectors for a given entry, or return -1 if it isn't present. 1679 * Note: for simplicity, the returned sector is 0-based. 1680 */ 1681 static int 1682 get_mapping(int i, unsigned int *cylinder, unsigned int *head, unsigned int *sector, 1683 unsigned long *absolute) 1684 { 1685 struct mbr_partition *part = &mboot.mbr_parts[i / 2]; 1686 1687 if (part->mbrp_type == 0) 1688 return -1; 1689 if (i % 2 == 0) { 1690 *cylinder = MBR_PCYL(part->mbrp_scyl, part->mbrp_ssect); 1691 *head = part->mbrp_shd; 1692 *sector = MBR_PSECT(part->mbrp_ssect); 1693 *absolute = le32toh(part->mbrp_start); 1694 } else { 1695 *cylinder = MBR_PCYL(part->mbrp_ecyl, part->mbrp_esect); 1696 *head = part->mbrp_ehd; 1697 *sector = MBR_PSECT(part->mbrp_esect); 1698 *absolute = le32toh(part->mbrp_start) 1699 + le32toh(part->mbrp_size) - 1; 1700 } 1701 /* Sanity check the data against all zeroes */ 1702 if ((*cylinder == 0) && (*sector == 0) && (*head == 0)) 1703 return -1; 1704 /* sector numbers in the MBR partition table start at 1 */ 1705 *sector = *sector - 1; 1706 /* Sanity check the data against max values */ 1707 if ((((*cylinder * MAXHEAD) + *head) * MAXSECTOR + *sector) < *absolute) 1708 /* cannot be a CHS mapping */ 1709 return -1; 1710 return 0; 1711 } 1712 1713 static void 1714 delete_ptn(int part) 1715 { 1716 if (part == ext.ptn_id) { 1717 /* forget all about the extended partition */ 1718 free(ext.ptn); 1719 memset(&ext, 0, sizeof ext); 1720 } 1721 1722 mboot.mbr_parts[part].mbrp_type = 0; 1723 } 1724 1725 static void 1726 delete_ext_ptn(int part) 1727 { 1728 1729 if (part == 0) { 1730 ext.ptn[0].mbr_parts[0].mbrp_type = 0; 1731 return; 1732 } 1733 ext.ptn[part - 1].mbr_parts[1] = ext.ptn[part].mbr_parts[1]; 1734 memmove(&ext.ptn[part], &ext.ptn[part + 1], 1735 (ext.num_ptn - part - 1) * sizeof ext.ptn[0]); 1736 ext.num_ptn--; 1737 } 1738 1739 static int 1740 add_ext_ptn(daddr_t start, daddr_t size) 1741 { 1742 int part; 1743 struct mbr_partition *partp; 1744 struct mbr_sector *nptn; 1745 1746 nptn = realloc(ext.ptn, (ext.num_ptn + 1) * sizeof *ext.ptn); 1747 if (!nptn) 1748 err(1, "realloc"); 1749 ext.ptn = nptn; 1750 for (part = 0; part < ext.num_ptn; part++) 1751 if (ext_offset(part) > start) 1752 break; 1753 /* insert before 'part' - make space... */ 1754 memmove(&ext.ptn[part + 1], &ext.ptn[part], 1755 (ext.num_ptn - part) * sizeof ext.ptn[0]); 1756 memset(&ext.ptn[part], 0, sizeof ext.ptn[0]); 1757 ext.ptn[part].mbr_magic = LE_MBR_MAGIC; 1758 /* we will be 'part' */ 1759 if (part == 0) { 1760 /* link us to 'next' */ 1761 partp = &ext.ptn[0].mbr_parts[1]; 1762 /* offset will be fixed by caller */ 1763 partp->mbrp_size = htole32( 1764 le32toh(ext.ptn[1].mbr_parts[0].mbrp_start) + 1765 le32toh(ext.ptn[1].mbr_parts[0].mbrp_size)); 1766 } else { 1767 /* link us to prev's next */ 1768 partp = &ext.ptn[part - 1].mbr_parts[1]; 1769 ext.ptn[part].mbr_parts[1] = *partp; 1770 /* and prev onto us */ 1771 partp->mbrp_start = htole32(start - ptn_0_offset - ext.base); 1772 partp->mbrp_size = htole32(size + ptn_0_offset); 1773 } 1774 partp->mbrp_type = 5; /* as used by win98 */ 1775 partp->mbrp_flag = 0; 1776 /* wallop in some CHS values - win98 doesn't saturate them */ 1777 dos(le32toh(partp->mbrp_start), 1778 &partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect); 1779 dos(le32toh(partp->mbrp_start) + le32toh(partp->mbrp_size) - 1, 1780 &partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect); 1781 ext.num_ptn++; 1782 1783 return part; 1784 } 1785 1786 static const char * 1787 check_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix) 1788 { 1789 int p; 1790 unsigned int p_s, p_e; 1791 1792 if (sysid != 0) { 1793 if (start == 0) 1794 return "Sector zero is reserved for the MBR"; 1795 #if 0 1796 if (start < ptn_0_offset) 1797 /* This is just a convention, not a requirement */ 1798 return "Track zero is reserved for the BIOS"; 1799 #endif 1800 if (start + size > disksectors) 1801 return "Partition exceeds size of disk"; 1802 for (p = 0; p < MBR_PART_COUNT; p++) { 1803 if (p == part || mboot.mbr_parts[p].mbrp_type == 0) 1804 continue; 1805 p_s = le32toh(mboot.mbr_parts[p].mbrp_start); 1806 p_e = p_s + le32toh(mboot.mbr_parts[p].mbrp_size); 1807 if (start + size <= p_s || start >= p_e) 1808 continue; 1809 if (f_flag) { 1810 if (fix) 1811 delete_ptn(p); 1812 return 0; 1813 } 1814 return "Overlaps another partition"; 1815 } 1816 } 1817 1818 /* Are we trying to create an extended partition */ 1819 if (!MBR_IS_EXTENDED(mboot.mbr_parts[part].mbrp_type)) { 1820 /* this wasn't the extended partition */ 1821 if (!MBR_IS_EXTENDED(sysid)) 1822 return 0; 1823 /* making an extended partition */ 1824 if (ext.base != 0) { 1825 if (!f_flag) 1826 return "There cannot be 2 extended partitions"; 1827 if (fix) 1828 delete_ptn(ext.ptn_id); 1829 } 1830 if (fix) { 1831 /* allocate a new extended partition */ 1832 ext.ptn = calloc(1, sizeof ext.ptn[0]); 1833 if (ext.ptn == NULL) 1834 err(1, "Malloc failed"); 1835 ext.ptn[0].mbr_magic = LE_MBR_MAGIC; 1836 ext.ptn_id = part; 1837 ext.base = start; 1838 ext.limit = start + size; 1839 ext.num_ptn = 1; 1840 } 1841 return 0; 1842 } 1843 1844 /* Check we haven't cut space allocated to an extended ptn */ 1845 1846 if (!MBR_IS_EXTENDED(sysid)) { 1847 /* no longer an extended partition */ 1848 if (fix) { 1849 /* Kill all memory of the extended partitions */ 1850 delete_ptn(part); 1851 return 0; 1852 } 1853 if (ext.num_ptn == 0 || 1854 (ext.num_ptn == 1 && ext.ptn[0].mbr_parts[0].mbrp_type == 0)) 1855 /* nothing in extended partition */ 1856 return 0; 1857 if (f_flag) 1858 return 0; 1859 if (yesno("Do you really want to delete all the extended partitions?")) 1860 return 0; 1861 return "Extended partition busy"; 1862 } 1863 1864 if (le32toh(mboot.mbr_parts[part].mbrp_start) != ext.base) 1865 /* maybe impossible, but an extra sanity check */ 1866 return 0; 1867 1868 for (p = ext.num_ptn; --p >= 0;) { 1869 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1870 continue; 1871 p_s = ext_offset(p); 1872 p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1873 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 1874 if (p_s >= start && p_e <= start + size) 1875 continue; 1876 if (!f_flag) 1877 return "Extended partition outside main partition"; 1878 if (fix) 1879 delete_ext_ptn(p); 1880 } 1881 1882 if (fix && start != ext.base) { 1883 /* The internal offsets need to be fixed up */ 1884 for (p = 0; p < ext.num_ptn - 1; p++) 1885 ext.ptn[p].mbr_parts[1].mbrp_start = htole32( 1886 le32toh(ext.ptn[p].mbr_parts[1].mbrp_start) 1887 + ext.base - start); 1888 /* and maybe an empty partition at the start */ 1889 if (ext.ptn[0].mbr_parts[0].mbrp_type == 0) { 1890 if (le32toh(ext.ptn[0].mbr_parts[1].mbrp_start) == 0) { 1891 /* don't need the empty slot */ 1892 memmove(&ext.ptn[0], &ext.ptn[1], 1893 (ext.num_ptn - 1) * sizeof ext.ptn[0]); 1894 ext.num_ptn--; 1895 } 1896 } else { 1897 /* must create an empty slot */ 1898 add_ext_ptn(start, ptn_0_offset); 1899 ext.ptn[0].mbr_parts[1].mbrp_start = htole32(ext.base 1900 - start); 1901 } 1902 } 1903 if (fix) { 1904 ext.base = start; 1905 ext.limit = start + size; 1906 } 1907 return 0; 1908 } 1909 1910 static const char * 1911 check_ext_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix) 1912 { 1913 int p; 1914 unsigned int p_s, p_e; 1915 1916 if (sysid == 0) 1917 return 0; 1918 1919 if (MBR_IS_EXTENDED(sysid)) 1920 return "Nested extended partitions are not allowed"; 1921 1922 /* allow one track at start for extended partition header */ 1923 start -= ptn_0_offset; 1924 size += ptn_0_offset; 1925 if (start < ext.base || start + size > ext.limit) 1926 return "Outside bounds of extended partition"; 1927 1928 if (f_flag && !fix) 1929 return 0; 1930 1931 for (p = ext.num_ptn; --p >= 0;) { 1932 if (p == part || ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1933 continue; 1934 p_s = ext_offset(p); 1935 p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1936 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 1937 if (p == 0) 1938 p_s += le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1939 - ptn_0_offset; 1940 if (start < p_e && start + size > p_s) { 1941 if (!f_flag) 1942 return "Overlaps another extended partition"; 1943 if (fix) { 1944 if (part == -1) 1945 delete_ext_ptn(p); 1946 else 1947 /* must not change numbering yet */ 1948 ext.ptn[p].mbr_parts[0].mbrp_type = 0; 1949 } 1950 } 1951 } 1952 return 0; 1953 } 1954 1955 static int 1956 change_part(int extended, int part, int sysid, daddr_t start, daddr_t size, 1957 char *bootmenu) 1958 { 1959 struct mbr_partition *partp; 1960 struct mbr_sector *boot; 1961 daddr_t offset; 1962 const char *e; 1963 int upart = part; 1964 int p; 1965 int fl; 1966 daddr_t n_s, n_e; 1967 const char *errtext; 1968 #ifdef BOOTSEL 1969 char tmp_bootmenu[MBR_PART_COUNT * (MBR_BS_PARTNAMESIZE + 1)]; 1970 int bootmenu_len = (extended ? MBR_PART_COUNT : 1) * (MBR_BS_PARTNAMESIZE + 1); 1971 #endif 1972 1973 if (extended) { 1974 if (part != -1 && part < ext.num_ptn) { 1975 boot = &ext.ptn[part]; 1976 partp = &boot->mbr_parts[0]; 1977 offset = ext_offset(part); 1978 } else { 1979 part = -1; 1980 boot = 0; 1981 partp = 0; 1982 offset = 0; 1983 } 1984 upart = 0; 1985 e = "E"; 1986 } else { 1987 boot = &mboot; 1988 partp = &boot->mbr_parts[part]; 1989 offset = 0; 1990 e = ""; 1991 } 1992 1993 if (!f_flag && part != -1) { 1994 printf("The data for partition %s%d is:\n", e, part); 1995 print_part(boot, upart, offset); 1996 } 1997 1998 #ifdef BOOTSEL 1999 if (bootmenu != NULL) 2000 strlcpy(tmp_bootmenu, bootmenu, bootmenu_len); 2001 else 2002 if (boot != NULL && boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) 2003 strlcpy(tmp_bootmenu, 2004 boot->mbr_bootsel.mbrbs_nametab[upart], 2005 bootmenu_len); 2006 else 2007 tmp_bootmenu[0] = 0; 2008 #endif 2009 2010 if (!s_flag && partp != NULL) { 2011 /* values not specified, default to current ones */ 2012 sysid = partp->mbrp_type; 2013 start = offset + le32toh(partp->mbrp_start); 2014 size = le32toh(partp->mbrp_size); 2015 } 2016 2017 /* creating a new partition, default to free space */ 2018 if (!s_flag && sysid == 0 && extended) { 2019 /* non-extended partition */ 2020 start = ext.base; 2021 for (p = 0; p < ext.num_ptn; p++) { 2022 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2023 continue; 2024 n_s = ext_offset(p); 2025 if (n_s > start + ptn_0_offset) 2026 break; 2027 start = ext_offset(p) 2028 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 2029 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 2030 } 2031 if (ext.limit - start <= ptn_0_offset) { 2032 printf("No space in extended partition\n"); 2033 return 0; 2034 } 2035 start += ptn_0_offset; 2036 } 2037 2038 if (!s_flag && sysid == 0 && !extended) { 2039 /* same for non-extended partition */ 2040 /* first see if old start is free */ 2041 if (start < ptn_0_offset) 2042 start = 0; 2043 for (p = 0; start != 0 && p < MBR_PART_COUNT; p++) { 2044 if (mboot.mbr_parts[p].mbrp_type == 0) 2045 continue; 2046 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2047 if (start >= n_s && 2048 start < n_s + le32toh(mboot.mbr_parts[p].mbrp_size)) 2049 start = 0; 2050 } 2051 if (start == 0) { 2052 /* Look for first gap */ 2053 start = ptn_0_offset; 2054 for (p = 0; p < MBR_PART_COUNT; p++) { 2055 if (mboot.mbr_parts[p].mbrp_type == 0) 2056 continue; 2057 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2058 n_e = n_s + le32toh(mboot.mbr_parts[p].mbrp_size); 2059 if (start >= n_s && start < n_e) { 2060 start = n_e; 2061 p = -1; 2062 } 2063 } 2064 if (start >= disksectors) { 2065 printf("No free space\n"); 2066 return 0; 2067 } 2068 } 2069 } 2070 2071 if (!f_flag) { 2072 /* request new values from user */ 2073 if (sysid == 0) 2074 sysid = 169; 2075 sysid = decimal("sysid", sysid, 0, 0, 255); 2076 if (sysid == 0 && !v_flag) { 2077 start = 0; 2078 size = 0; 2079 #ifdef BOOTSEL 2080 tmp_bootmenu[0] = 0; 2081 #endif 2082 } else { 2083 daddr_t old = start; 2084 daddr_t lim = extended ? ext.limit : disksectors; 2085 start = decimal("start", start, 2086 DEC_SEC | DEC_RND_0 | (extended ? DEC_RND : 0), 2087 extended ? ext.base : 0, lim); 2088 /* Adjust 'size' so that end doesn't move when 'start' 2089 * is only changed slightly. 2090 */ 2091 if (size > start - old) 2092 size -= start - old; 2093 else 2094 size = 0; 2095 /* Find end of available space from this start point */ 2096 if (extended) { 2097 for (p = 0; p < ext.num_ptn; p++) { 2098 if (p == part) 2099 continue; 2100 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2101 continue; 2102 n_s = ext_offset(p); 2103 if (n_s > start && n_s < lim) 2104 lim = n_s; 2105 if (start >= n_s && start < n_s 2106 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 2107 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size)) { 2108 lim = start; 2109 break; 2110 } 2111 } 2112 } else { 2113 for (p = 0; p < MBR_PART_COUNT; p++) { 2114 if (p == part) 2115 continue; 2116 if (mboot.mbr_parts[p].mbrp_type == 0) 2117 continue; 2118 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2119 if (n_s > start && n_s < lim) 2120 lim = n_s; 2121 if (start >= n_s && start < n_s 2122 + le32toh(mboot.mbr_parts[p].mbrp_size)) { 2123 lim = start; 2124 break; 2125 } 2126 } 2127 } 2128 lim -= start; 2129 if (lim == 0) { 2130 printf("Start sector already allocated\n"); 2131 return 0; 2132 } 2133 if (size == 0 || size > lim) 2134 size = lim; 2135 fl = DEC_SEC; 2136 if (start % ptn_alignment == ptn_0_offset) 2137 fl |= DEC_RND_DOWN; 2138 if (start == 2 * ptn_0_offset) 2139 fl |= DEC_RND_DOWN | DEC_RND_DOWN_2; 2140 size = decimal("size", size, fl, 0, lim); 2141 #ifdef BOOTSEL 2142 #ifndef DEFAULT_BOOTEXTCODE 2143 if (!extended) 2144 #endif 2145 string("bootmenu", bootmenu_len, tmp_bootmenu); 2146 #endif 2147 } 2148 } 2149 2150 /* 2151 * Before we write these away, we must verify that nothing 2152 * untoward has been requested. 2153 */ 2154 2155 if (extended) 2156 errtext = check_ext_overlap(part, sysid, start, size, 0); 2157 else 2158 errtext = check_overlap(part, sysid, start, size, 0); 2159 if (errtext != NULL) { 2160 if (f_flag) 2161 errx(2, "%s\n", errtext); 2162 printf("%s\n", errtext); 2163 return 0; 2164 } 2165 2166 /* 2167 * Before proceeding, delete any overlapped partitions. 2168 * This can only happen if '-f' was supplied on the command line. 2169 * Just hope the caller knows what they are doing. 2170 * This also fixes the base of each extended partition if the 2171 * partition itself has moved. 2172 */ 2173 2174 if (extended) 2175 errtext = check_ext_overlap(part, sysid, start, size, 1); 2176 else 2177 errtext = check_overlap(part, sysid, start, size, 1); 2178 2179 if (errtext) 2180 errx(1, "%s\n", errtext); 2181 2182 if (sysid == 0) { 2183 /* delete this partition - save info though */ 2184 if (partp == NULL) 2185 /* must have been trying to create an extended ptn */ 2186 return 0; 2187 if (start == 0 && size == 0) 2188 memset(partp, 0, sizeof *partp); 2189 #ifdef BOOTSEL 2190 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) 2191 memset(boot->mbr_bootsel.mbrbs_nametab[upart], 0, 2192 sizeof boot->mbr_bootsel.mbrbs_nametab[0]); 2193 #endif 2194 if (extended) 2195 delete_ext_ptn(part); 2196 else 2197 delete_ptn(part); 2198 return 1; 2199 } 2200 2201 2202 if (extended) { 2203 if (part != -1) 2204 delete_ext_ptn(part); 2205 if (start == ext.base + ptn_0_offset) 2206 /* First one must have been free */ 2207 part = 0; 2208 else 2209 part = add_ext_ptn(start, size); 2210 2211 /* These must be re-calculated because of the realloc */ 2212 boot = &ext.ptn[part]; 2213 partp = &boot->mbr_parts[0]; 2214 offset = ext_offset(part); 2215 } 2216 2217 partp->mbrp_type = sysid; 2218 partp->mbrp_start = htole32( start - offset); 2219 partp->mbrp_size = htole32( size); 2220 dos(start, &partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect); 2221 dos(start + size - 1, 2222 &partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect); 2223 #ifdef BOOTSEL 2224 if (extended) { 2225 boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC; 2226 strncpy(boot->mbr_bootsel.mbrbs_nametab[upart], tmp_bootmenu, 2227 bootmenu_len); 2228 } else { 2229 /* We need to bootselect code installed in order to have 2230 * somewhere to safely write the menu tag. 2231 */ 2232 if (boot->mbr_bootsel_magic != LE_MBR_BS_MAGIC) { 2233 if (f_flag || 2234 yesno("The bootselect code is not installed, " 2235 "do you want to install it now?")) 2236 install_bootsel(MBR_BS_ACTIVE); 2237 } 2238 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 2239 strncpy(boot->mbr_bootsel.mbrbs_nametab[upart], 2240 tmp_bootmenu, bootmenu_len); 2241 } 2242 } 2243 #endif 2244 2245 if (v_flag && !f_flag && yesno("Explicitly specify beg/end address?")) { 2246 /* this really isn't a good idea.... */ 2247 int tsector, tcylinder, thead; 2248 2249 tcylinder = MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect); 2250 thead = partp->mbrp_shd; 2251 tsector = MBR_PSECT(partp->mbrp_ssect); 2252 tcylinder = decimal("beginning cylinder", 2253 tcylinder, 0, 0, dos_cylinders - 1); 2254 thead = decimal("beginning head", 2255 thead, 0, 0, dos_heads - 1); 2256 tsector = decimal("beginning sector", 2257 tsector, 0, 1, dos_sectors); 2258 partp->mbrp_scyl = DOSCYL(tcylinder); 2259 partp->mbrp_shd = thead; 2260 partp->mbrp_ssect = DOSSECT(tsector, tcylinder); 2261 2262 tcylinder = MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect); 2263 thead = partp->mbrp_ehd; 2264 tsector = MBR_PSECT(partp->mbrp_esect); 2265 tcylinder = decimal("ending cylinder", 2266 tcylinder, 0, 0, dos_cylinders - 1); 2267 thead = decimal("ending head", 2268 thead, 0, 0, dos_heads - 1); 2269 tsector = decimal("ending sector", 2270 tsector, 0, 1, dos_sectors); 2271 partp->mbrp_ecyl = DOSCYL(tcylinder); 2272 partp->mbrp_ehd = thead; 2273 partp->mbrp_esect = DOSSECT(tsector, tcylinder); 2274 } 2275 2276 /* If we had to mark an extended partition as deleted because 2277 * another request would have overlapped it, now is the time 2278 * to do the actual delete. 2279 */ 2280 if (extended && f_flag) { 2281 for (p = ext.num_ptn; --p >= 0;) 2282 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2283 delete_ext_ptn(p); 2284 } 2285 return 1; 2286 } 2287 2288 static void 2289 print_geometry(void) 2290 { 2291 2292 if (sh_flag) { 2293 printf("DISK=%s\n", disk); 2294 printf("DLCYL=%d\nDLHEAD=%d\nDLSEC=%d\nDLSIZE=%"PRIdaddr"\n", 2295 cylinders, heads, sectors, disksectors); 2296 printf("BCYL=%d\nBHEAD=%d\nBSEC=%d\nBDLSIZE=%"PRIdaddr"\n", 2297 dos_cylinders, dos_heads, dos_sectors, dos_disksectors); 2298 printf("NUMEXTPTN=%d\n", ext.num_ptn); 2299 return; 2300 } 2301 2302 /* Not sh_flag */ 2303 printf("Disk: %s\n", disk); 2304 printf("NetBSD disklabel disk geometry:\n"); 2305 printf("cylinders: %d, heads: %d, sectors/track: %d " 2306 "(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr"\n\n", 2307 cylinders, heads, sectors, cylindersectors, disksectors); 2308 printf("BIOS disk geometry:\n"); 2309 printf("cylinders: %d, heads: %d, sectors/track: %d " 2310 "(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr"\n\n", 2311 dos_cylinders, dos_heads, dos_sectors, dos_cylindersectors, 2312 dos_disksectors); 2313 printf("Partitions aligned to %d sector boundaries, offset %d\n\n", 2314 ptn_alignment, ptn_0_offset); 2315 } 2316 2317 /* Find the first active partition, else return MBR_PART_COUNT */ 2318 static int 2319 first_active(void) 2320 { 2321 struct mbr_partition *partp = &mboot.mbr_parts[0]; 2322 int part; 2323 2324 for (part = 0; part < MBR_PART_COUNT; part++) 2325 if (partp[part].mbrp_flag & MBR_PFLAG_ACTIVE) 2326 return part; 2327 return MBR_PART_COUNT; 2328 } 2329 2330 static void 2331 change_active(int which) 2332 { 2333 struct mbr_partition *partp; 2334 int part; 2335 int active = MBR_PART_COUNT; 2336 2337 partp = &mboot.mbr_parts[0]; 2338 2339 if (a_flag && which != -1) 2340 active = which; 2341 else 2342 active = first_active(); 2343 if (!f_flag) { 2344 if (yesno("Do you want to change the active partition?")) { 2345 printf ("Choosing %d will make no partition active.\n", 2346 MBR_PART_COUNT); 2347 do { 2348 active = decimal("active partition", 2349 active, 0, 0, MBR_PART_COUNT); 2350 } while (!yesno("Are you happy with this choice?")); 2351 } else 2352 return; 2353 } else 2354 if (active != MBR_PART_COUNT) 2355 printf ("Making partition %d active.\n", active); 2356 2357 for (part = 0; part < MBR_PART_COUNT; part++) 2358 partp[part].mbrp_flag &= ~MBR_PFLAG_ACTIVE; 2359 if (active < MBR_PART_COUNT) 2360 partp[active].mbrp_flag |= MBR_PFLAG_ACTIVE; 2361 } 2362 2363 static void 2364 change_bios_geometry(void) 2365 { 2366 print_geometry(); 2367 if (!yesno("Do you want to change our idea of what BIOS thinks?")) 2368 return; 2369 2370 #if defined(USE_DISKLIST) 2371 if (dl != NULL) { 2372 struct biosdisk_info *bip; 2373 int i; 2374 2375 for (i = 0; i < dl->dl_nbiosdisks; i++) { 2376 if (i == 0) 2377 printf("\nGeometries of known disks:\n"); 2378 bip = &dl->dl_biosdisks[i]; 2379 printf("Disk %d: cylinders %u, heads %u, sectors %u" 2380 " (%"PRIdaddr" sectors, %dMB)\n", 2381 i, bip->bi_cyl, bip->bi_head, bip->bi_sec, 2382 bip->bi_lbasecs, SEC_TO_MB(bip->bi_lbasecs)); 2383 2384 } 2385 printf("\n"); 2386 } 2387 #endif 2388 do { 2389 dos_cylinders = decimal("BIOS's idea of #cylinders", 2390 dos_cylinders, 0, 0, MAXCYL); 2391 dos_heads = decimal("BIOS's idea of #heads", 2392 dos_heads, 0, 0, MAXHEAD); 2393 dos_sectors = decimal("BIOS's idea of #sectors", 2394 dos_sectors, 0, 1, MAXSECTOR); 2395 print_geometry(); 2396 } while (!yesno("Are you happy with this choice?")); 2397 } 2398 2399 2400 /***********************************************\ 2401 * Change real numbers into strange dos numbers * 2402 \***********************************************/ 2403 static void 2404 dos(int sector, unsigned char *cylinderp, unsigned char *headp, 2405 unsigned char *sectorp) 2406 { 2407 int cylinder, head; 2408 2409 cylinder = sector / dos_cylindersectors; 2410 sector -= cylinder * dos_cylindersectors; 2411 2412 head = sector / dos_sectors; 2413 sector -= head * dos_sectors; 2414 if (cylinder > 1023) 2415 cylinder = 1023; 2416 2417 *cylinderp = DOSCYL(cylinder); 2418 *headp = head; 2419 *sectorp = DOSSECT(sector + 1, cylinder); 2420 } 2421 2422 static int 2423 open_disk(int update) 2424 { 2425 static char namebuf[MAXPATHLEN + 1]; 2426 int flags = update && disk_file == NULL ? O_RDWR : O_RDONLY; 2427 2428 if (!F_flag) { 2429 fd = opendisk(disk, flags, namebuf, sizeof(namebuf), 0); 2430 if (fd < 0) { 2431 if (errno == ENODEV) 2432 warnx("%s is not a character device", namebuf); 2433 else 2434 warn("cannot opendisk %s", namebuf); 2435 return (-1); 2436 } 2437 disk = namebuf; 2438 } else { 2439 fd = open(disk, flags, 0); 2440 if (fd == -1) { 2441 warn("cannot open %s", disk); 2442 return -1; 2443 } 2444 } 2445 2446 if (get_params() == -1) { 2447 close(fd); 2448 fd = -1; 2449 return (-1); 2450 } 2451 if (disk_file != NULL) { 2452 /* for testing: read/write data from a disk file */ 2453 wfd = open(disk_file, update ? O_RDWR|O_CREAT : O_RDONLY, 0777); 2454 if (wfd == -1) { 2455 warn("%s", disk_file); 2456 close(fd); 2457 fd = -1; 2458 return -1; 2459 } 2460 } else 2461 wfd = fd; 2462 return (0); 2463 } 2464 2465 static int 2466 read_disk(daddr_t sector, void *buf) 2467 { 2468 2469 if (*rfd == -1) 2470 errx(1, "read_disk(); fd == -1"); 2471 if (lseek(*rfd, sector * (off_t)512, 0) == -1) 2472 return (-1); 2473 return (read(*rfd, buf, 512)); 2474 } 2475 2476 static int 2477 write_disk(daddr_t sector, void *buf) 2478 { 2479 2480 if (wfd == -1) 2481 errx(1, "write_disk(); wfd == -1"); 2482 if (lseek(wfd, sector * (off_t)512, 0) == -1) 2483 return (-1); 2484 return (write(wfd, buf, 512)); 2485 } 2486 2487 static void 2488 guess_geometry(daddr_t _sectors) 2489 { 2490 dos_sectors = MAXSECTOR; 2491 dos_heads = MAXHEAD - 1; /* some BIOS might use 256 */ 2492 dos_cylinders = _sectors / (MAXSECTOR * (MAXHEAD - 1)); 2493 if (dos_cylinders < 1) 2494 dos_cylinders = 1; 2495 else if (dos_cylinders > MAXCYL - 1) 2496 dos_cylinders = MAXCYL - 1; 2497 } 2498 2499 static int 2500 get_params(void) 2501 { 2502 if (disk_type != NULL) { 2503 struct disklabel *tmplabel; 2504 2505 if ((tmplabel = getdiskbyname(disk_type)) == NULL) { 2506 warn("bad disktype"); 2507 return (-1); 2508 } 2509 disklabel = *tmplabel; 2510 } else if (F_flag) { 2511 struct stat st; 2512 if (fstat(fd, &st) == -1) { 2513 warn("fstat"); 2514 return (-1); 2515 } 2516 if (st.st_size % 512 != 0) { 2517 warnx("%s size (%lld) is not divisible " 2518 "by sector size (%d)", disk, (long long)st.st_size, 2519 512); 2520 } 2521 disklabel.d_secperunit = st.st_size / 512; 2522 guess_geometry(disklabel.d_secperunit); 2523 disklabel.d_ncylinders = dos_cylinders; 2524 disklabel.d_ntracks = dos_heads; 2525 disklabel.d_nsectors = dos_sectors; 2526 } else if (ioctl(fd, DIOCGDEFLABEL, &disklabel) == -1) { 2527 warn("DIOCGDEFLABEL"); 2528 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 2529 warn("DIOCGDINFO"); 2530 return (-1); 2531 } 2532 } 2533 2534 disksectors = disklabel.d_secperunit; 2535 cylinders = disklabel.d_ncylinders; 2536 heads = disklabel.d_ntracks; 2537 sectors = disklabel.d_nsectors; 2538 2539 /* pick up some defaults for the BIOS sizes */ 2540 if (sectors <= MAXSECTOR) { 2541 dos_cylinders = cylinders; 2542 dos_heads = heads; 2543 dos_sectors = sectors; 2544 } else { 2545 /* guess - has to better than the above */ 2546 guess_geometry(disksectors); 2547 } 2548 dos_disksectors = disksectors; 2549 2550 return (0); 2551 } 2552 2553 #ifdef BOOTSEL 2554 /* 2555 * Rather unfortunately the bootsel 'magic' number is at the end of the 2556 * the structure, and there is no checksum. So when other operating 2557 * systems install mbr code by only writing the length of their code they 2558 * can overwrite part of the structure but keeping the magic number intact. 2559 * This code attempts to empirically detect this problem. 2560 */ 2561 static int 2562 validate_bootsel(struct mbr_bootsel *mbs) 2563 { 2564 unsigned int key = mbs->mbrbs_defkey; 2565 unsigned int tmo; 2566 size_t i; 2567 2568 if (v_flag) 2569 return 0; 2570 2571 /* 2572 * Check default key is sane 2573 * - this is the most likely field to be stuffed 2574 * 16 disks and 16 bootable partitions seems enough! 2575 * (the keymap decode starts falling apart at that point) 2576 */ 2577 if (mbs->mbrbs_flags & MBR_BS_ASCII) { 2578 if (key != 0 && !(key == '\r' 2579 || (key >= '1' && key < '1' + MAX_BIOS_DISKS) 2580 || (key >= 'a' && key < 'a' + MAX_BIOS_DISKS))) 2581 return 1; 2582 } else { 2583 if (key != 0 && !(key == SCAN_ENTER 2584 || (key >= SCAN_1 && key < SCAN_1 + MAX_BIOS_DISKS) 2585 || (key >= SCAN_F1 && key < SCAN_F1 + MAX_BIOS_DISKS))) 2586 return 1; 2587 } 2588 2589 /* Checking the flags will lead to breakage... */ 2590 2591 /* Timeout value is expected to be a multiple of a second */ 2592 tmo = htole16(mbs->mbrbs_timeo); 2593 if (tmo != 0 && tmo != 0xffff && tmo != (10 * tmo + 9) / 182 * 182 / 10) 2594 return 2; 2595 2596 /* Check the menu strings are printable */ 2597 /* Unfortunately they aren't zero filled... */ 2598 for (i = 0; i < sizeof(mbs->mbrbs_nametab); i++) { 2599 int c = (uint8_t)mbs->mbrbs_nametab[0][i]; 2600 if (c == 0 || isprint(c)) 2601 continue; 2602 return 3; 2603 } 2604 2605 return 0; 2606 } 2607 #endif 2608 2609 static int 2610 read_s0(daddr_t offset, struct mbr_sector *boot) 2611 { 2612 const char *tabletype = offset ? "extended" : "primary"; 2613 #ifdef BOOTSEL 2614 static int reported; 2615 #endif 2616 2617 if (read_disk(offset, boot) == -1) { 2618 warn("Can't read %s partition table", tabletype); 2619 return -1; 2620 } 2621 if (boot->mbr_magic != LE_MBR_MAGIC) { 2622 warnx("%s partition table invalid, " 2623 "no magic in sector %"PRIdaddr, tabletype, offset); 2624 return -1; 2625 2626 } 2627 #ifdef BOOTSEL 2628 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 2629 /* mbr_bootsel in new location */ 2630 if (validate_bootsel(&boot->mbr_bootsel)) { 2631 warnx("removing corrupt bootsel information"); 2632 boot->mbr_bootsel_magic = 0; 2633 } 2634 return 0; 2635 } 2636 if (boot->mbr_bootsel_magic != LE_MBR_MAGIC) 2637 return 0; 2638 2639 /* mbr_bootsel in old location */ 2640 if (!reported) 2641 warnx("%s partition table: using old-style bootsel information", 2642 tabletype); 2643 reported = 1; 2644 if (validate_bootsel((void *)((uint8_t *)boot + MBR_BS_OFFSET + 4))) { 2645 warnx("%s bootsel information corrupt - ignoring", tabletype); 2646 return 0; 2647 } 2648 memmove((uint8_t *)boot + MBR_BS_OFFSET, 2649 (uint8_t *)boot + MBR_BS_OFFSET + 4, 2650 sizeof(struct mbr_bootsel)); 2651 if ( ! (boot->mbr_bootsel.mbrbs_flags & MBR_BS_NEWMBR)) { 2652 /* old style default key */ 2653 int id; 2654 /* F1..F4 => ptn 0..3, F5+ => disk 0+ */ 2655 id = boot->mbr_bootsel.mbrbs_defkey; 2656 id -= SCAN_F1; 2657 if (id >= MBR_PART_COUNT) 2658 id -= MBR_PART_COUNT; /* Use number of disk */ 2659 else if (mboot.mbr_parts[id].mbrp_type != 0) 2660 id = le32toh(boot->mbr_parts[id].mbrp_start); 2661 else 2662 id = DEFAULT_ACTIVE; 2663 boot->mbr_bootsel.mbrbs_defkey = id; 2664 } 2665 boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC; 2666 /* highlight that new bootsel code is necessary */ 2667 boot->mbr_bootsel.mbrbs_flags &= ~MBR_BS_NEWMBR; 2668 #endif /* BOOTSEL */ 2669 return 0; 2670 } 2671 2672 static int 2673 write_mbr(void) 2674 { 2675 int flag, i; 2676 daddr_t offset; 2677 int rval = -1; 2678 2679 /* 2680 * write enable label sector before write (if necessary), 2681 * disable after writing. 2682 * needed if the disklabel protected area also protects 2683 * sector 0. (e.g. empty disk) 2684 */ 2685 flag = 1; 2686 if (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0) 2687 warn("DIOCWLABEL"); 2688 if (write_disk(0, &mboot) == -1) { 2689 warn("Can't write fdisk partition table"); 2690 goto protect_label; 2691 } 2692 if (boot_installed) 2693 for (i = bootsize; (i -= 0x200) > 0;) 2694 if (write_disk(i / 0x200, &bootcode[i / 0x200]) == -1) { 2695 warn("Can't write bootcode"); 2696 goto protect_label; 2697 } 2698 for (offset = 0, i = 0; i < ext.num_ptn; i++) { 2699 if (write_disk(ext.base + offset, ext.ptn + i) == -1) { 2700 warn("Can't write %dth extended partition", i); 2701 goto protect_label; 2702 } 2703 offset = le32toh(ext.ptn[i].mbr_parts[1].mbrp_start); 2704 } 2705 rval = 0; 2706 protect_label: 2707 flag = 0; 2708 if (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0) 2709 warn("DIOCWLABEL"); 2710 return rval; 2711 } 2712 2713 static int 2714 yesno(const char *str, ...) 2715 { 2716 int ch, first; 2717 va_list ap; 2718 2719 va_start(ap, str); 2720 2721 vprintf(str, ap); 2722 printf(" [n] "); 2723 2724 first = ch = getchar(); 2725 while (ch != '\n' && ch != EOF) 2726 ch = getchar(); 2727 if (ch == EOF) 2728 errx(1, "EOF"); 2729 return (first == 'y' || first == 'Y'); 2730 } 2731 2732 static int64_t 2733 decimal(const char *prompt, int64_t dflt, int flags, int64_t minval, int64_t maxval) 2734 { 2735 int64_t acc = 0; 2736 int valid; 2737 int len; 2738 char *cp; 2739 2740 for (;;) { 2741 if (flags & DEC_SEC) { 2742 printf("%s: [%" PRId64 "..%" PRId64 "cyl default: %" PRId64 ", %" PRId64 "cyl, %uMB] ", 2743 prompt, SEC_TO_CYL(minval), SEC_TO_CYL(maxval), 2744 dflt, SEC_TO_CYL(dflt), SEC_TO_MB(dflt)); 2745 } else 2746 printf("%s: [%" PRId64 "..%" PRId64 " default: %" PRId64 "] ", 2747 prompt, minval, maxval, dflt); 2748 2749 if (!fgets(lbuf, LBUF, stdin)) 2750 errx(1, "EOF"); 2751 cp = lbuf; 2752 2753 cp += strspn(cp, " \t"); 2754 if (*cp == '\n') 2755 return dflt; 2756 2757 if (cp[0] == '$' && cp[1] == '\n') 2758 return maxval; 2759 2760 if (isdigit((unsigned char)*cp) || *cp == '-') { 2761 acc = strtoll(lbuf, &cp, 10); 2762 len = strcspn(cp, " \t\n"); 2763 valid = 0; 2764 if (len != 0 && (flags & DEC_SEC)) { 2765 if (!strncasecmp(cp, "gb", len)) { 2766 acc *= 1024; 2767 valid = 1; 2768 } 2769 if (valid || !strncasecmp(cp, "mb", len)) { 2770 acc *= SEC_IN_1M; 2771 /* round to whole number of cylinders */ 2772 acc += ptn_alignment / 2; 2773 acc /= ptn_alignment; 2774 valid = 1; 2775 } 2776 if (valid || !strncasecmp(cp, "cyl", len)) { 2777 acc *= ptn_alignment; 2778 /* adjustments for cylinder boundary */ 2779 if (acc == 0 && flags & DEC_RND_0) 2780 acc += ptn_0_offset; 2781 if (flags & DEC_RND) 2782 acc += ptn_0_offset; 2783 if (flags & DEC_RND_DOWN) 2784 acc -= ptn_0_offset; 2785 if (flags & DEC_RND_DOWN_2) 2786 acc -= ptn_0_offset; 2787 cp += len; 2788 } 2789 } 2790 } 2791 2792 cp += strspn(cp, " \t"); 2793 if (*cp != '\n') { 2794 lbuf[strlen(lbuf) - 1] = 0; 2795 printf("%s is not a valid %s number.\n", lbuf, 2796 flags & DEC_SEC ? "sector" : "decimal"); 2797 continue; 2798 } 2799 2800 if (acc >= minval && acc <= maxval) 2801 return acc; 2802 printf("%" PRId64 " is not between %" PRId64 " and %" PRId64 ".\n", acc, minval, maxval); 2803 } 2804 } 2805 2806 static int 2807 ptn_id(const char *prompt, int *extended) 2808 { 2809 unsigned int acc = 0; 2810 char *cp; 2811 2812 for (;; printf("%s is not a valid partition number.\n", lbuf)) { 2813 printf("%s: [none] ", prompt); 2814 2815 if (!fgets(lbuf, LBUF, stdin)) 2816 errx(1, "EOF"); 2817 lbuf[strlen(lbuf)-1] = '\0'; 2818 cp = lbuf; 2819 2820 cp += strspn(cp, " \t"); 2821 *extended = 0; 2822 if (*cp == 0) 2823 return -1; 2824 2825 if (*cp == 'E' || *cp == 'e') { 2826 cp++; 2827 *extended = 1; 2828 } 2829 2830 acc = strtoul(cp, &cp, 10); 2831 2832 cp += strspn(cp, " \t"); 2833 if (*cp != '\0') 2834 continue; 2835 2836 if (*extended || acc < MBR_PART_COUNT) 2837 return acc; 2838 } 2839 } 2840 2841 #ifdef BOOTSEL 2842 static void 2843 string(const char *prompt, int length, char *buf) 2844 { 2845 int len; 2846 2847 for (;;) { 2848 printf("%s: [%.*s] ", prompt, length, buf); 2849 2850 if (!fgets(lbuf, LBUF, stdin)) 2851 errx(1, "EOF"); 2852 len = strlen(lbuf); 2853 if (len <= 1) 2854 /* unchanged if just <enter> */ 2855 return; 2856 /* now strip trailing spaces, <space><enter> deletes string */ 2857 do 2858 lbuf[--len] = 0; 2859 while (len != 0 && lbuf[len - 1] == ' '); 2860 if (len < length) 2861 break; 2862 printf("'%s' is longer than %d characters.\n", 2863 lbuf, length - 1); 2864 } 2865 strncpy(buf, lbuf, length); 2866 } 2867 #endif 2868 2869 static int 2870 type_match(const void *key, const void *item) 2871 { 2872 const int *idp = key; 2873 const struct mbr_ptype *ptr = item; 2874 2875 if (*idp < ptr->id) 2876 return (-1); 2877 if (*idp > ptr->id) 2878 return (1); 2879 return (0); 2880 } 2881 2882 static const char * 2883 get_type(int type) 2884 { 2885 struct mbr_ptype *ptr; 2886 2887 ptr = bsearch(&type, mbr_ptypes, KNOWN_SYSIDS, 2888 sizeof(mbr_ptypes[0]), type_match); 2889 if (ptr == 0) 2890 return ("unknown"); 2891 return (ptr->name); 2892 } 2893 2894 static int 2895 read_gpt(daddr_t offset, struct gpt_hdr *gptp) 2896 { 2897 char buf[512]; 2898 struct gpt_hdr *hdr = (void *)buf; 2899 const char *tabletype = GPT_TYPE(offset); 2900 2901 if (read_disk(offset, buf) == -1) { 2902 warn("Can't read %s GPT header", tabletype); 2903 return -1; 2904 } 2905 (void)memcpy(gptp, buf, GPT_HDR_SIZE); 2906 2907 /* GPT CRC should be calculated with CRC field preset to zero */ 2908 hdr->hdr_crc_self = 0; 2909 2910 if (memcmp(gptp->hdr_sig, GPT_HDR_SIG, sizeof(gptp->hdr_sig)) 2911 || gptp->hdr_lba_self != (uint64_t)offset 2912 || crc32(0, (void *)hdr, gptp->hdr_size) != gptp->hdr_crc_self) { 2913 /* not a GPT */ 2914 (void)memset(gptp, 0, GPT_HDR_SIZE); 2915 } 2916 2917 if (v_flag && gptp->hdr_size != 0) { 2918 printf("Found %s GPT header CRC %"PRIu32" " 2919 "at sector %"PRIdaddr", backup at %"PRIdaddr"\n", 2920 tabletype, gptp->hdr_crc_self, offset, gptp->hdr_lba_alt); 2921 } 2922 return gptp->hdr_size; 2923 2924 } 2925 2926 static int 2927 delete_gpt(struct gpt_hdr *gptp) 2928 { 2929 char buf[512]; 2930 struct gpt_hdr *hdr = (void *)buf; 2931 2932 if (gptp->hdr_size == 0) 2933 return 0; 2934 2935 /* don't accidently overwrite something important */ 2936 if (gptp->hdr_lba_self != GPT_HDR_BLKNO && 2937 gptp->hdr_lba_self != (uint64_t)disksectors - 1) { 2938 warnx("given GPT header location doesn't seem correct"); 2939 return -1; 2940 } 2941 2942 (void)memcpy(buf, gptp, GPT_HDR_SIZE); 2943 /* 2944 * Don't really delete GPT, just "disable" it, so it can 2945 * be recovered later in case of mistake or something 2946 */ 2947 (void)memset(hdr->hdr_sig, 0, sizeof(gptp->hdr_sig)); 2948 if (write_disk(gptp->hdr_lba_self, hdr) == -1) { 2949 warn("can't delete %s GPT header", 2950 GPT_TYPE(gptp->hdr_lba_self)); 2951 return -1; 2952 } 2953 (void)memset(gptp, 0, GPT_HDR_SIZE); 2954 return 1; 2955 } 2956
Indexes created Tue Sep 23 14:10:03 GMT 2025