fdisk.c revision 1.142.2.1
1 /* $NetBSD: fdisk.c,v 1.142.2.1 2013/02/25 00:28:05 tls 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 1.142.2.1 2013/02/25 00:28:05 tls 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 #ifndef DEFAULT_BOOTDIR 90 #define DEFAULT_BOOTDIR "/usr/mdec" 91 #endif 92 93 #define LE_MBR_MAGIC htole16(MBR_MAGIC) 94 #define LE_MBR_BS_MAGIC htole16(MBR_BS_MAGIC) 95 96 #ifdef BOOTSEL 97 98 #define DEFAULT_BOOTCODE "mbr" 99 #define DEFAULT_BOOTSELCODE "mbr_bootsel" 100 #define DEFAULT_BOOTEXTCODE "mbr_ext" 101 102 /* Scan values for the various keys we use, as returned by the BIOS */ 103 #define SCAN_ENTER 0x1c 104 #define SCAN_F1 0x3b 105 #define SCAN_1 0x2 106 107 108 #define MAX_BIOS_DISKS 16 /* Going beyond F12 is hard though! */ 109 110 /* We same the dflt 'boot partition' as a disk block, with some magic values. */ 111 #define DEFAULT_ACTIVE (~(daddr_t)0) 112 #define DEFAULT_DISK(n) (DEFAULT_ACTIVE - MAX_BIOS_DISKS + (n)) 113 114 #endif 115 116 #define GPT_TYPE(offs) ((offs) == GPT_HDR_BLKNO ? "primary" : "secondary") 117 118 #ifndef PRIdaddr 119 #define PRIdaddr PRId64 120 #endif 121 122 #ifndef _PATH_DEFDISK 123 #define _PATH_DEFDISK "/dev/rwd0d" 124 #endif 125 126 struct { 127 struct mbr_sector *ptn; /* array of pbrs */ 128 daddr_t base; /* first sector of ext. ptn */ 129 daddr_t limit; /* last sector of ext. ptn */ 130 int num_ptn; /* number of contained partitions */ 131 int ptn_id; /* entry in mbr */ 132 int is_corrupt; /* 1 if extended chain illegal */ 133 } ext; 134 135 #define LBUF 100 136 static char lbuf[LBUF]; 137 138 static const char *disk = _PATH_DEFDISK; 139 140 static struct disklabel disklabel; /* disk parameters */ 141 142 static struct mbr_sector mboot; 143 144 static const char *boot_dir = DEFAULT_BOOTDIR; 145 static char *boot_path = NULL; /* name of file we actually opened */ 146 147 #ifdef BOOTSEL 148 #define BOOTSEL_OPTIONS "B" 149 #else 150 #define BOOTSEL_OPTIONS 151 #define change_part(e, p, id, st, sz, bm) change__part(e, p, id, st, sz) 152 #endif 153 #define OPTIONS BOOTSEL_OPTIONS "0123FSafiIluvA:b:c:E:r:s:w:z:" 154 155 /* 156 * Disk geometry and partition alignment. 157 * 158 * Modern disks do not have a fixed geomery and will always give a 'faked' 159 * geometry that matches the ATA standard - max 16 heads and 256 sec/track. 160 * The ATA geometry allows access to 2^28 sectors (as does LBA mode). 161 * 162 * The BIOS calls originally used an 8bit register for cylinder, head and 163 * sector. Later 2 bits were stolen from the sector number and added to 164 * cylinder number. The BIOS will translate this faked geometry either to 165 * the geometry reported by the disk, or do LBA reads (possibly LBA48). 166 * BIOS CHS reads have all sorts of limits, but 2^24 is absolute. 167 * For historic reasons the BIOS geometry is the called the dos geometry! 168 * 169 * If you know the disks real geometry it is usually worth aligning 170 * disk partitions to cylinder boundaries (certainly traditional!). 171 * For 'mbr' disks this has always been done with the BIOS geometry. 172 * The first track (typically 63 sectors) is reserved because the first 173 * sector is used for boot code. Similarly the data partition in an 174 * extended partition will start one track in. If an extended partition 175 * starts at the beginning of the disk you lose 2 tracks. 176 * 177 * However non-magnetic media in particular has physical sectors that are 178 * not the same size as those reported, so has to do read modify write 179 * sequences for misaligned transfers. The alignment of partitions to 180 * cylinder boundaries makes this happen all the time. 181 * 182 * It is thus sensible to align partitions on a sensible sector boundary. 183 * For instance 1MB (2048 sectors). 184 * Common code can do this by using a geometry with 1 head and 2048 185 * sectors per track. 186 */ 187 188 /* Disks reported geometry and overall size from device driver */ 189 static unsigned int cylinders, sectors, heads; 190 static daddr_t disksectors; 191 #define cylindersectors (heads * sectors) 192 193 /* Geometry from the BIOS */ 194 static unsigned int dos_cylinders; 195 static unsigned int dos_heads; 196 static unsigned int dos_sectors; 197 static daddr_t dos_disksectors; 198 #define dos_cylindersectors (dos_heads * dos_sectors) 199 #define dos_totalsectors (dos_heads * dos_sectors * dos_cylinders) 200 201 #define DOSSECT(s,c) (((s) & 0x3f) | (((c) >> 2) & 0xc0)) 202 #define DOSCYL(c) ((c) & 0xff) 203 #define SEC_IN_1M (1024 * 1024 / 512) 204 #define SEC_TO_MB(sec) ((unsigned int)(((sec) + SEC_IN_1M / 2) / SEC_IN_1M)) 205 #define SEC_TO_CYL(sec) (((sec) + dos_cylindersectors/2) / dos_cylindersectors) 206 207 #define MAXCYL 1024 /* Usual limit is 1023 */ 208 #define MAXHEAD 256 /* Usual limit is 255 */ 209 #define MAXSECTOR 63 210 static int partition = -1; 211 212 /* Alignment of partition, and offset if first sector unusable */ 213 static unsigned int ptn_alignment; /* default dos_cylindersectors */ 214 static unsigned int ptn_0_offset; /* default dos_sectors */ 215 216 static int fd = -1, wfd = -1, *rfd = &fd; 217 static char *disk_file = NULL; 218 static char *disk_type = NULL; 219 220 static int a_flag; /* set active partition */ 221 static int i_flag; /* init bootcode */ 222 static int I_flag; /* ignore errors */ 223 static int u_flag; /* update partition data */ 224 static int v_flag; /* more verbose */ 225 static int sh_flag; /* Output data as shell defines */ 226 static int f_flag; /* force --not interactive */ 227 static int s_flag; /* set id,offset,size */ 228 static int b_flag; /* Set cyl, heads, secs (as c/h/s) */ 229 static int B_flag; /* Edit/install bootselect code */ 230 static int E_flag; /* extended partition number */ 231 static int b_cyl, b_head, b_sec; /* b_flag values. */ 232 233 #if !HAVE_NBTOOL_CONFIG_H 234 static int F_flag = 0; 235 #else 236 /* Tool - force 'file' mode to avoid unsupported functions and ioctls */ 237 static int F_flag = 1; 238 #endif 239 240 static struct gpt_hdr gpt1, gpt2; /* GUID partition tables */ 241 242 static struct mbr_sector bootcode[8192 / sizeof (struct mbr_sector)]; 243 static ssize_t secsize = 512; /* sector size */ 244 static char *iobuf; /* buffer for non 512 sector I/O */ 245 static int bootsize; /* actual size of bootcode */ 246 static int boot_installed; /* 1 if we've copied code into the mbr */ 247 248 #if defined(USE_DISKLIST) 249 #include <machine/cpu.h> 250 static struct disklist *dl; 251 #endif 252 253 254 #define KNOWN_SYSIDS (sizeof(mbr_ptypes)/sizeof(mbr_ptypes[0])) 255 256 __dead static void usage(void); 257 static void print_s0(int); 258 static void print_part(struct mbr_sector *, int, daddr_t); 259 static void print_mbr_partition(struct mbr_sector *, int, daddr_t, daddr_t, int); 260 static void print_pbr(daddr_t, int, uint8_t); 261 static int is_all_zero(const unsigned char *, size_t); 262 static void printvis(int, const char *, const char *, size_t); 263 static int read_boot(const char *, void *, size_t, int); 264 static void init_sector0(int); 265 static void intuit_translated_geometry(void); 266 static void get_bios_geometry(void); 267 static void get_extended_ptn(void); 268 static void get_ptn_alignmemt(void); 269 #if defined(USE_DISKLIST) 270 static void get_diskname(const char *, char *, size_t); 271 #endif 272 static int change_part(int, int, int, daddr_t, daddr_t, char *); 273 static void print_geometry(void); 274 static int first_active(void); 275 static void change_active(int); 276 static void change_bios_geometry(void); 277 static void dos(int, unsigned char *, unsigned char *, unsigned char *); 278 static int open_disk(int); 279 static ssize_t read_disk(daddr_t, void *); 280 static ssize_t write_disk(daddr_t, void *); 281 static int get_params(void); 282 static int read_s0(daddr_t, struct mbr_sector *); 283 static int write_mbr(void); 284 static int read_gpt(daddr_t, struct gpt_hdr *); 285 static int delete_gpt(struct gpt_hdr *); 286 static int yesno(const char *, ...) __printflike(1, 2); 287 static int64_t decimal(const char *, int64_t, int, int64_t, int64_t); 288 #define DEC_SEC 1 /* asking for a sector number */ 289 #define DEC_RND 2 /* round to end of first track */ 290 #define DEC_RND_0 4 /* convert 0 to size of a track */ 291 #define DEC_RND_DOWN 8 /* subtract 1 track */ 292 #define DEC_RND_DOWN_2 16 /* subtract 2 tracks */ 293 static int ptn_id(const char *, int *); 294 static int type_match(const void *, const void *); 295 static const char *get_type(int); 296 static int get_mapping(int, unsigned int *, unsigned int *, unsigned int *, unsigned long *); 297 #ifdef BOOTSEL 298 static daddr_t configure_bootsel(daddr_t); 299 static void install_bootsel(int); 300 static daddr_t get_default_boot(void); 301 static void set_default_boot(daddr_t); 302 static void string(const char *, int, char *); 303 #endif 304 305 static void 306 initvar_disk(const char **diskp) 307 { 308 #if !HAVE_NBTOOL_CONFIG_H 309 int mib[2]; 310 size_t len; 311 char *root_device; 312 313 mib[0] = CTL_KERN; 314 mib[1] = KERN_ROOT_DEVICE; 315 if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1 || 316 (root_device = malloc(len)) == NULL || 317 sysctl(mib, 2, root_device, &len, NULL, 0) == -1) 318 return; 319 320 *diskp = root_device; 321 #endif /* HAVE_NBTOOL_CONFIG_H */ 322 } 323 324 int 325 main(int argc, char *argv[]) 326 { 327 struct stat sb; 328 int ch; 329 size_t len; 330 char *cp; 331 int n; 332 #ifdef BOOTSEL 333 daddr_t default_ptn; /* start sector of default ptn */ 334 char *cbootmenu = 0; 335 #endif 336 337 int csysid; /* For the s_flag. */ 338 unsigned int cstart, csize; 339 a_flag = u_flag = sh_flag = f_flag = s_flag = b_flag = 0; 340 i_flag = B_flag = 0; 341 v_flag = 0; 342 E_flag = 0; 343 csysid = cstart = csize = 0; 344 while ((ch = getopt(argc, argv, OPTIONS)) != -1) { 345 switch (ch) { 346 case '0': 347 partition = 0; 348 break; 349 case '1': 350 partition = 1; 351 break; 352 case '2': 353 partition = 2; 354 break; 355 case '3': 356 partition = 3; 357 break; 358 case 'E': /* Extended partition number */ 359 E_flag = 1; 360 partition = strtoul(optarg, &cp, 0); 361 if (*cp || partition < 0) 362 errx(1, "Bad partition number -E %s.", optarg); 363 break; 364 #ifdef BOOTSEL 365 case 'B': /* Bootselect parameters */ 366 B_flag = 1; 367 break; 368 #endif 369 case 'F': /* device argument is really a file */ 370 F_flag = 1; 371 break; 372 case 'S': /* Output as shell variables */ 373 sh_flag = 1; 374 break; 375 case 'a': /* Set active partition */ 376 a_flag = 1; 377 break; 378 case 'f': /* Non interactive */ 379 f_flag = 1; 380 break; 381 case 'i': /* Always update bootcode */ 382 i_flag = 1; 383 break; 384 case 'I': /* Ignore errors */ 385 I_flag = 1; 386 break; 387 case 'l': /* List known partition types */ 388 for (len = 0; len < KNOWN_SYSIDS; len++) 389 printf("%03d %s\n", mbr_ptypes[len].id, 390 mbr_ptypes[len].name); 391 return 0; 392 case 'u': /* Update partition details */ 393 u_flag = 1; 394 break; 395 case 'v': /* Be verbose */ 396 v_flag++; 397 break; 398 case 's': /* Partition details */ 399 s_flag = 1; 400 if (sscanf(optarg, "%d/%u/%u%n", &csysid, &cstart, 401 &csize, &n) == 3) { 402 if (optarg[n] == 0) 403 break; 404 #ifdef BOOTSEL 405 if (optarg[n] == '/') { 406 cbootmenu = optarg + n + 1; 407 break; 408 } 409 #endif 410 } 411 errx(1, "Bad argument to the -s flag."); 412 break; 413 case 'b': /* BIOS geometry */ 414 b_flag = 1; 415 if (sscanf(optarg, "%d/%d/%d%n", &b_cyl, &b_head, 416 &b_sec, &n) != 3 || optarg[n] != 0) 417 errx(1, "Bad argument to the -b flag."); 418 if (b_cyl > MAXCYL) 419 b_cyl = MAXCYL; 420 break; 421 case 'A': /* Partition alignment[/offset] */ 422 if (sscanf(optarg, "%u%n/%u%n", &ptn_alignment, 423 &n, &ptn_0_offset, &n) < 1 424 || optarg[n] != 0 425 || ptn_0_offset > ptn_alignment) 426 errx(1, "Bad argument to the -A flag."); 427 if (ptn_0_offset == 0) 428 ptn_0_offset = ptn_alignment; 429 break; 430 case 'c': /* file/directory containing boot code */ 431 if (strchr(optarg, '/') != NULL && 432 stat(optarg, &sb) == 0 && 433 (sb.st_mode & S_IFMT) == S_IFDIR) { 434 boot_dir = optarg; 435 break; 436 } 437 bootsize = read_boot(optarg, bootcode, 438 sizeof bootcode, 1); 439 i_flag = 1; 440 break; 441 case 'r': /* read data from disk_file (not raw disk) */ 442 rfd = &wfd; 443 /* FALLTHROUGH */ 444 case 'w': /* write data to disk_file */ 445 disk_file = optarg; 446 break; 447 case 't': 448 if (setdisktab(optarg) == -1) 449 errx(EXIT_FAILURE, "bad disktab"); 450 break; 451 case 'T': 452 disk_type = optarg; 453 break; 454 case 'z': 455 secsize = atoi(optarg); 456 if (secsize <= 512) 457 out: errx(EXIT_FAILURE, "Invalid sector size %zd", 458 secsize); 459 for (ch = secsize; (ch & 1) == 0; ch >>= 1) 460 continue; 461 if (ch != 1) 462 goto out; 463 if ((iobuf = malloc(secsize)) == NULL) 464 err(EXIT_FAILURE, "Cannot allocate %zd buffer", 465 secsize); 466 break; 467 default: 468 usage(); 469 } 470 } 471 argc -= optind; 472 argv += optind; 473 474 if (disk_type != NULL && getdiskbyname(disk_type) == NULL) 475 errx(EXIT_FAILURE, "bad disktype"); 476 477 if (sh_flag && (a_flag || i_flag || u_flag || f_flag || s_flag)) 478 usage(); 479 480 if (B_flag && f_flag) { 481 warnx("Bootselector may only be configured interactively"); 482 usage(); 483 } 484 485 if (f_flag && u_flag && !s_flag) { 486 warnx("Partition data not specified"); 487 usage(); 488 } 489 490 if (s_flag && partition == -1) { 491 warnx("-s flag requires a partition selected."); 492 usage(); 493 } 494 495 if (argc > 1) 496 usage(); 497 498 if (argc > 0) 499 disk = argv[0]; 500 else if (!F_flag) { 501 /* Default to boot device */ 502 initvar_disk(&disk); 503 } 504 505 if (!F_flag && stat(disk, &sb) == 0 && S_ISREG(sb.st_mode)) 506 F_flag = 1; 507 508 if (open_disk(B_flag || a_flag || i_flag || u_flag) < 0) 509 exit(1); 510 511 if (read_s0(0, &mboot)) 512 /* must have been a blank disk */ 513 init_sector0(1); 514 515 read_gpt(GPT_HDR_BLKNO, &gpt1); 516 read_gpt(disksectors - 1, &gpt2); 517 518 if (b_flag) { 519 dos_cylinders = b_cyl; 520 dos_heads = b_head; 521 dos_sectors = b_sec; 522 } else { 523 get_bios_geometry(); 524 } 525 526 if (ptn_alignment == 0) 527 get_ptn_alignmemt(); 528 529 get_extended_ptn(); 530 531 #ifdef BOOTSEL 532 default_ptn = get_default_boot(); 533 #endif 534 535 if (E_flag && !u_flag && partition >= ext.num_ptn) 536 errx(1, "Extended partition %d is not defined.", partition); 537 538 /* Do the update stuff! */ 539 if (u_flag) { 540 if (!f_flag && !b_flag) 541 change_bios_geometry(); 542 543 if (s_flag) 544 change_part(E_flag, partition, csysid, cstart, csize, 545 cbootmenu); 546 else { 547 int part = partition, chg_ext = E_flag, prompt = 1; 548 do { 549 if (prompt) { 550 printf("\n"); 551 print_s0(partition); 552 } 553 if (partition == -1) 554 part = ptn_id( 555 "Which partition do you want to change?", 556 &chg_ext); 557 if (part < 0) 558 break; 559 prompt = change_part(chg_ext, part, 0, 0, 0, 0); 560 } while (partition == -1); 561 } 562 } else { 563 if (!i_flag && !B_flag) { 564 print_geometry(); 565 print_s0(partition); 566 } 567 } 568 569 if (a_flag && !E_flag) 570 change_active(partition); 571 572 #ifdef BOOTSEL 573 if (B_flag || u_flag || i_flag) 574 /* Ensure the mbr code supports this configuration */ 575 install_bootsel(0); 576 if (B_flag) 577 default_ptn = configure_bootsel(default_ptn); 578 set_default_boot(default_ptn); 579 #else 580 if (i_flag) 581 init_sector0(0); 582 #endif 583 584 if (u_flag || a_flag || i_flag || B_flag) { 585 if (!f_flag) { 586 printf("\nWe haven't written the MBR back to disk " 587 "yet. This is your last chance.\n"); 588 if (u_flag) 589 print_s0(-1); 590 if (gpt1.hdr_size != 0 || gpt2.hdr_size != 0) 591 printf("\nWARNING: The disk is carrying " 592 "GUID Partition Tables.\n" 593 " If you continue, " 594 "GPT headers will be deleted.\n\n"); 595 if (yesno("Should we write new partition table?")) { 596 delete_gpt(&gpt1); 597 delete_gpt(&gpt2); 598 write_mbr(); 599 } 600 } else { 601 if (delete_gpt(&gpt1) > 0) 602 warnx("Primary GPT header was deleted"); 603 if (delete_gpt(&gpt2) > 0) 604 warnx("Secondary GPT header was deleted"); 605 write_mbr(); 606 } 607 } 608 609 exit(0); 610 } 611 612 static void 613 usage(void) 614 { 615 int indent = 7 + (int)strlen(getprogname()) + 1; 616 617 (void)fprintf(stderr, "usage: %s [-aBFfIilSuv] " 618 "[-A ptn_alignment[/ptn_0_offset]] \\\n" 619 "%*s[-b cylinders/heads/sectors] \\\n" 620 "%*s[-0123 | -E num " 621 "[-s id/start/size[/bootmenu]]] \\\n" 622 "%*s[-t disktab] [-T disktype] \\\n" 623 "%*s[-c bootcode] " 624 "[-r|-w file] [device]\n" 625 "\t-a change active partition\n" 626 "\t-f force - not interactive\n" 627 "\t-i initialise MBR code\n" 628 "\t-I ignore errors about no space or overlapping partitions\n" 629 "\t-l list partition types\n" 630 "\t-u update partition data\n" 631 "\t-v verbose output, -v -v more verbose still\n" 632 "\t-B update bootselect options\n" 633 "\t-F treat device as a regular file\n" 634 "\t-S output as shell defines\n" 635 "\t-r and -w access 'file' for non-destructive testing\n", 636 getprogname(), indent, "", indent, "", indent, "", indent, ""); 637 exit(1); 638 } 639 640 static daddr_t 641 ext_offset(int part) 642 { 643 daddr_t offset = ext.base; 644 645 if (part != 0) 646 offset += le32toh(ext.ptn[part - 1].mbr_parts[1].mbrp_start); 647 return offset; 648 } 649 650 static void 651 print_s0(int which) 652 { 653 int part; 654 655 if (which == -1) { 656 if (!sh_flag) 657 printf("Partition table:\n"); 658 for (part = 0; part < MBR_PART_COUNT; part++) { 659 if (!sh_flag) 660 printf("%d: ", part); 661 print_part(&mboot, part, 0); 662 } 663 if (!sh_flag) { 664 if (ext.is_corrupt) 665 printf("Extended partition table is corrupt\n"); 666 else 667 if (ext.num_ptn != 0) 668 printf("Extended partition table:\n"); 669 } 670 for (part = 0; part < ext.num_ptn; part++) { 671 if (!sh_flag) 672 printf("E%d: ", part); 673 print_part(&ext.ptn[part], 0, ext_offset(part)); 674 if (!sh_flag && v_flag >= 2) { 675 printf("link: "); 676 print_mbr_partition(&ext.ptn[part], 1, 677 ext_offset(part), ext.base, 0); 678 } 679 } 680 #ifdef BOOTSEL 681 if (!sh_flag && mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 682 int tmo; 683 684 printf("Bootselector "); 685 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ACTIVE) { 686 printf("enabled"); 687 tmo = le16toh(mboot.mbr_bootsel.mbrbs_timeo); 688 if (tmo == 0xffff) 689 printf(", infinite timeout"); 690 else 691 printf(", timeout %d seconds", 692 (10 * tmo + 9) / 182); 693 } else 694 printf("disabled"); 695 printf(".\n"); 696 } 697 #endif 698 if (!sh_flag) { 699 int active = first_active(); 700 if (active == MBR_PART_COUNT) 701 printf("No active partition.\n"); 702 else 703 printf("First active partition: %d\n", active); 704 } 705 if (!sh_flag && mboot.mbr_dsn != 0) 706 printf("Drive serial number: %"PRIu32" (0x%08x)\n", 707 le32toh(mboot.mbr_dsn), 708 le32toh(mboot.mbr_dsn)); 709 return; 710 } 711 712 if (E_flag) { 713 if (!sh_flag) 714 printf("Extended partition E%d:\n", which); 715 if (which > ext.num_ptn) 716 printf("Undefined\n"); 717 else 718 print_part(&ext.ptn[which], 0, ext_offset(which)); 719 } else { 720 if (!sh_flag) 721 printf("Partition %d:\n", which); 722 print_part(&mboot, which, 0); 723 } 724 } 725 726 static void 727 print_part(struct mbr_sector *boot, int part, daddr_t offset) 728 { 729 struct mbr_partition *partp; 730 const char *e; 731 732 if (!sh_flag) { 733 print_mbr_partition(boot, part, offset, 0, 0); 734 return; 735 } 736 737 partp = &boot->mbr_parts[part]; 738 if (boot != &mboot) { 739 part = boot - ext.ptn; 740 e = "E"; 741 } else 742 e = ""; 743 744 if (partp->mbrp_type == 0) { 745 printf("PART%s%dSIZE=0\n", e, part); 746 return; 747 } 748 749 printf("PART%s%dID=%d\n", e, part, partp->mbrp_type); 750 printf("PART%s%dSIZE=%u\n", e, part, le32toh(partp->mbrp_size)); 751 printf("PART%s%dSTART=%"PRIdaddr"\n", e, part, 752 offset + le32toh(partp->mbrp_start)); 753 printf("PART%s%dFLAG=0x%x\n", e, part, partp->mbrp_flag); 754 printf("PART%s%dBCYL=%d\n", e, part, 755 MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect)); 756 printf("PART%s%dBHEAD=%d\n", e, part, partp->mbrp_shd); 757 printf("PART%s%dBSEC=%d\n", e, part, MBR_PSECT(partp->mbrp_ssect)); 758 printf("PART%s%dECYL=%d\n", e, part, 759 MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect)); 760 printf("PART%s%dEHEAD=%d\n", e, part, partp->mbrp_ehd); 761 printf("PART%s%dESEC=%d\n", e, part, MBR_PSECT(partp->mbrp_esect)); 762 } 763 764 static void 765 pr_cyls(daddr_t sector, int is_end) 766 { 767 unsigned long cyl, head, sect; 768 cyl = sector / dos_cylindersectors; 769 sect = sector - cyl * dos_cylindersectors; 770 head = sect / dos_sectors; 771 sect -= head * dos_sectors; 772 773 printf("%lu", cyl); 774 775 if (is_end) { 776 if (head == dos_heads - 1 && sect == dos_sectors - 1) 777 return; 778 } else { 779 if (head == 0 && sect == 0) 780 return; 781 } 782 783 printf("/%lu/%lu", head, sect + 1); 784 } 785 786 static void 787 print_mbr_partition(struct mbr_sector *boot, int part, 788 daddr_t offset, daddr_t exoffset, int indent) 789 { 790 daddr_t start; 791 daddr_t size; 792 struct mbr_partition *partp = &boot->mbr_parts[part]; 793 struct mbr_sector eboot; 794 int p; 795 static int dumped = 0; 796 797 if (partp->mbrp_type == 0 && v_flag < 2) { 798 printf("<UNUSED>\n"); 799 return; 800 } 801 802 start = le32toh(partp->mbrp_start); 803 size = le32toh(partp->mbrp_size); 804 if (MBR_IS_EXTENDED(partp->mbrp_type)) 805 start += exoffset; 806 else 807 start += offset; 808 809 printf("%s (sysid %d)\n", get_type(partp->mbrp_type), partp->mbrp_type); 810 #ifdef BOOTSEL 811 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC && 812 boot->mbr_bootsel.mbrbs_nametab[part][0]) 813 printf("%*s bootmenu: %s\n", indent, "", 814 boot->mbr_bootsel.mbrbs_nametab[part]); 815 #endif 816 817 printf("%*s start %"PRIdaddr", size %"PRIdaddr, 818 indent, "", start, size); 819 if (size != 0) { 820 printf(" (%u MB, Cyls ", SEC_TO_MB(size)); 821 if (v_flag == 0 && le32toh(partp->mbrp_start) == ptn_0_offset) 822 pr_cyls(start - ptn_0_offset, 0); 823 else 824 pr_cyls(start, 0); 825 printf("-"); 826 pr_cyls(start + size - 1, 1); 827 printf(")"); 828 } 829 830 switch (partp->mbrp_flag) { 831 case 0: 832 break; 833 case MBR_PFLAG_ACTIVE: 834 printf(", Active"); 835 break; 836 default: 837 printf(", flag 0x%x", partp->mbrp_flag); 838 break; 839 } 840 printf("\n"); 841 842 if (v_flag) { 843 printf("%*s beg: cylinder %4d, head %3d, sector %2d\n", 844 indent, "", 845 MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect), 846 partp->mbrp_shd, MBR_PSECT(partp->mbrp_ssect)); 847 printf("%*s end: cylinder %4d, head %3d, sector %2d\n", 848 indent, "", 849 MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect), 850 partp->mbrp_ehd, MBR_PSECT(partp->mbrp_esect)); 851 } 852 853 if (partp->mbrp_type == 0 && start == 0 && v_flag < 3) 854 return; 855 856 if (! MBR_IS_EXTENDED(partp->mbrp_type)) 857 print_pbr(start, indent + 8, partp->mbrp_type); 858 859 if (!MBR_IS_EXTENDED(partp->mbrp_type) || 860 (v_flag <= 2 && !ext.is_corrupt)) 861 return; 862 863 /* 864 * Recursive dump extended table, 865 * This is read from the disk - so is wrong during editing. 866 * Just ensure we only show it once. 867 */ 868 if (dumped) 869 return; 870 871 printf("%*s Extended partition table:\n", indent, ""); 872 indent += 4; 873 if (read_s0(start, &eboot) == -1) 874 return; 875 for (p = 0; p < MBR_PART_COUNT; p++) { 876 printf("%*s%d: ", indent, "", p); 877 print_mbr_partition(&eboot, p, start, 878 exoffset ? exoffset : start, indent); 879 } 880 881 if (exoffset == 0) 882 dumped = 1; 883 } 884 885 /* Print a line with a label and a vis-encoded string */ 886 static void 887 printvis(int indent, const char *label, const char *buf, size_t size) 888 { 889 char *visbuf; 890 891 if ((visbuf = malloc(size * 4 + 1)) == NULL) 892 err(1, "Malloc failed"); 893 strsvisx(visbuf, buf, size, VIS_TAB|VIS_NL|VIS_OCTAL, "\""); 894 printf("%*s%s: \"%s\"\n", 895 indent, "", 896 label, visbuf); 897 free(visbuf); 898 } 899 900 /* Check whether a buffer contains all bytes zero */ 901 static int 902 is_all_zero(const unsigned char *p, size_t size) 903 { 904 905 while (size-- > 0) { 906 if (*p++ != 0) 907 return 0; 908 } 909 return 1; 910 } 911 912 /* 913 * Report on the contents of a PBR sector. 914 * 915 * We first perform several sanity checks. If vflag >= 2, we report all 916 * failing tests, but for smaller values of v_flag we stop after the 917 * first failing test. Tests are ordered in an attempt to get the most 918 * useful error message from the first failing test. 919 * 920 * If v_flag >= 2, we also report some decoded values from the PBR. 921 * These results may be meaningless, if the PBR doesn't follow common 922 * conventions. 923 * 924 * Trying to decode anything more than the magic number in the last 925 * two bytes is a layering violation, but it can be very useful in 926 * diagnosing boot failures. 927 */ 928 static void 929 print_pbr(daddr_t sector, int indent, uint8_t part_type) 930 { 931 struct mbr_sector pboot; 932 unsigned char *p, *endp; 933 unsigned char val; 934 int ok; 935 int errcount = 0; 936 937 #define PBR_ERROR(...) \ 938 do { \ 939 ++errcount; \ 940 printf("%*s%s: ", indent, "", \ 941 (v_flag < 2 ? "PBR is not bootable" : "Not bootable")); \ 942 printf(__VA_ARGS__); \ 943 if (v_flag < 2) \ 944 return; \ 945 } while (/*CONSTCOND*/ 0) 946 947 if (v_flag >= 2) { 948 printf("%*sInformation from PBR:\n", 949 indent, ""); 950 indent += 4; 951 } 952 953 if (read_disk(sector, &pboot) == -1) { 954 PBR_ERROR("Sector %"PRIdaddr" is unreadable (%s)\n", 955 sector, strerror(errno)); 956 return; 957 } 958 959 /* all bytes identical? */ 960 p = (unsigned char *)&pboot; 961 endp = p + sizeof(pboot); 962 val = *p; 963 ok = 0; 964 for (; p < endp; p++) { 965 if (*p != val) { 966 ok = 1; 967 break; 968 } 969 } 970 if (! ok) 971 PBR_ERROR("All bytes are identical (0x%02x)\n", val); 972 973 if (pboot.mbr_magic != LE_MBR_MAGIC) 974 PBR_ERROR("Bad magic number (0x%04x)\n", 975 le16toh(pboot.mbr_magic)); 976 977 #if 0 978 /* Some i386 OS might fail this test. All non-i386 will fail. */ 979 if (pboot.mbr_jmpboot[0] != 0xE9 980 && pboot.mbr_jmpboot[0] != 0xEB) { 981 PBR_ERROR("Does not begin with i386 JMP instruction" 982 " (0x%02x 0x%02x0 0x%02x)\n", 983 pboot.mbr_jmpboot[0], pboot.mbr_jmpboot[1], 984 pboot.mbr_jmpboot[2]); 985 } 986 #endif 987 988 if (v_flag > 0 && errcount == 0) 989 printf("%*sPBR appears to be bootable\n", 990 indent, ""); 991 if (v_flag < 2) 992 return; 993 994 if (! is_all_zero(pboot.mbr_oemname, sizeof(pboot.mbr_oemname))) { 995 printvis(indent, "OEM name", (char *)pboot.mbr_oemname, 996 sizeof(pboot.mbr_oemname)); 997 } 998 999 if (pboot.mbr_bpb.bpb16.bsBootSig == 0x29) 1000 printf("%*sBPB FAT16 boot signature found\n", 1001 indent, ""); 1002 if (pboot.mbr_bpb.bpb32.bsBootSig == 0x29) 1003 printf("%*sBPB FAT32 boot signature found\n", 1004 indent, ""); 1005 1006 #undef PBR_ERROR 1007 } 1008 1009 static int 1010 read_boot(const char *name, void *buf, size_t len, int err_exit) 1011 { 1012 int bfd, ret; 1013 struct stat st; 1014 1015 if (boot_path != NULL) 1016 free(boot_path); 1017 if (strchr(name, '/') == 0) 1018 asprintf(&boot_path, "%s/%s", boot_dir, name); 1019 else 1020 boot_path = strdup(name); 1021 if (boot_path == NULL) 1022 err(1, "Malloc failed"); 1023 1024 if ((bfd = open(boot_path, O_RDONLY)) < 0 || fstat(bfd, &st) == -1) { 1025 warn("%s", boot_path); 1026 goto fail; 1027 } 1028 1029 if (st.st_size > (off_t)len) { 1030 warnx("%s: bootcode too large", boot_path); 1031 goto fail; 1032 } 1033 ret = st.st_size; 1034 if (ret < 0x200) { 1035 warnx("%s: bootcode too small", boot_path); 1036 goto fail; 1037 } 1038 if (read(bfd, buf, len) != ret) { 1039 warn("%s", boot_path); 1040 goto fail; 1041 } 1042 1043 /* 1044 * Do some sanity checking here 1045 */ 1046 if (((struct mbr_sector *)buf)->mbr_magic != LE_MBR_MAGIC) { 1047 warnx("%s: invalid magic", boot_path); 1048 goto fail; 1049 } 1050 1051 close(bfd); 1052 ret = (ret + 0x1ff) & ~0x1ff; 1053 return ret; 1054 1055 fail: 1056 if (bfd >= 0) 1057 close(bfd); 1058 if (err_exit) 1059 exit(1); 1060 return 0; 1061 } 1062 1063 static void 1064 init_sector0(int zappart) 1065 { 1066 int i; 1067 int copy_size = offsetof(struct mbr_sector, mbr_dsn); 1068 1069 #ifdef DEFAULT_BOOTCODE 1070 if (bootsize == 0) 1071 bootsize = read_boot(DEFAULT_BOOTCODE, bootcode, 1072 sizeof bootcode, 0); 1073 #endif 1074 #ifdef BOOTSEL 1075 if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC 1076 && bootcode[0].mbr_bootsel_magic == LE_MBR_BS_MAGIC) 1077 copy_size = MBR_BS_OFFSET; 1078 #endif 1079 1080 if (bootsize != 0) { 1081 boot_installed = 1; 1082 memcpy(&mboot, bootcode, copy_size); 1083 mboot.mbr_bootsel_magic = bootcode[0].mbr_bootsel_magic; 1084 } 1085 mboot.mbr_magic = LE_MBR_MAGIC; 1086 1087 if (!zappart) 1088 return; 1089 for (i = 0; i < MBR_PART_COUNT; i++) 1090 memset(&mboot.mbr_parts[i], 0, sizeof(mboot.mbr_parts[i])); 1091 } 1092 1093 static void 1094 get_extended_ptn(void) 1095 { 1096 struct mbr_partition *mp; 1097 struct mbr_sector *boot; 1098 daddr_t offset; 1099 struct mbr_sector *nptn; 1100 1101 /* find first (there should only be one) extended partition */ 1102 for (mp = mboot.mbr_parts; !MBR_IS_EXTENDED(mp->mbrp_type); mp++) 1103 if (mp >= &mboot.mbr_parts[MBR_PART_COUNT]) 1104 return; 1105 1106 /* 1107 * The extended partition should be structured as a linked list 1108 * (even though it appears, at first glance, to be a tree). 1109 */ 1110 ext.base = le32toh(mp->mbrp_start); 1111 ext.limit = ext.base + le32toh(mp->mbrp_size); 1112 ext.ptn_id = mp - mboot.mbr_parts; 1113 for (offset = 0;; offset = le32toh(boot->mbr_parts[1].mbrp_start)) { 1114 nptn = realloc(ext.ptn, (ext.num_ptn + 1) * sizeof *ext.ptn); 1115 if (nptn == NULL) 1116 err(1, "Malloc failed"); 1117 ext.ptn = nptn; 1118 boot = ext.ptn + ext.num_ptn; 1119 if (read_s0(offset + ext.base, boot) == -1) 1120 break; 1121 /* expect p0 to be valid and p1 to be another extended ptn */ 1122 if (MBR_IS_EXTENDED(boot->mbr_parts[0].mbrp_type)) 1123 break; 1124 if (boot->mbr_parts[1].mbrp_type != 0 && 1125 !MBR_IS_EXTENDED(boot->mbr_parts[1].mbrp_type)) 1126 break; 1127 /* p2 and p3 should be unallocated */ 1128 if (boot->mbr_parts[2].mbrp_type != 0 || 1129 boot->mbr_parts[3].mbrp_type != 0) 1130 break; 1131 /* data ptn inside extended one */ 1132 if (boot->mbr_parts[0].mbrp_type != 0 && 1133 offset + le32toh(boot->mbr_parts[0].mbrp_start) 1134 + le32toh(boot->mbr_parts[0].mbrp_size) > ext.limit) 1135 break; 1136 1137 ext.num_ptn++; 1138 1139 if (boot->mbr_parts[1].mbrp_type == 0) 1140 /* end of extended partition chain */ 1141 return; 1142 /* must be in sector order */ 1143 if (offset >= le32toh(boot->mbr_parts[1].mbrp_start)) 1144 break; 1145 } 1146 1147 warnx("Extended partition table is corrupt\n"); 1148 ext.is_corrupt = 1; 1149 ext.num_ptn = 0; 1150 } 1151 1152 #if defined(USE_DISKLIST) 1153 static void 1154 get_diskname(const char *fullname, char *diskname, size_t size) 1155 { 1156 const char *p, *p2; 1157 size_t len; 1158 1159 p = strrchr(fullname, '/'); 1160 if (p == NULL) 1161 p = fullname; 1162 else 1163 p++; 1164 1165 if (*p == 0) { 1166 strlcpy(diskname, fullname, size); 1167 return; 1168 } 1169 1170 if (*p == 'r') 1171 p++; 1172 1173 for (p2 = p; *p2 != 0; p2++) 1174 if (isdigit((unsigned char)*p2)) 1175 break; 1176 if (*p2 == 0) { 1177 /* XXX invalid diskname? */ 1178 strlcpy(diskname, fullname, size); 1179 return; 1180 } 1181 while (isdigit((unsigned char)*p2)) 1182 p2++; 1183 1184 len = p2 - p; 1185 if (len > size) { 1186 /* XXX */ 1187 strlcpy(diskname, fullname, size); 1188 return; 1189 } 1190 1191 memcpy(diskname, p, len); 1192 diskname[len] = 0; 1193 } 1194 #endif 1195 1196 static void 1197 get_ptn_alignmemt(void) 1198 { 1199 struct mbr_partition *partp = &mboot.mbr_parts[0]; 1200 uint32_t ptn_0_base, ptn_0_limit; 1201 1202 /* Default to using 'traditional' cylinder alignment */ 1203 ptn_alignment = dos_cylindersectors; 1204 ptn_0_offset = dos_sectors; 1205 1206 if (partp->mbrp_type != 0) { 1207 /* Try to copy alignment of first partition */ 1208 ptn_0_base = le32toh(partp->mbrp_start); 1209 ptn_0_limit = ptn_0_base + le32toh(partp->mbrp_size); 1210 if (!(ptn_0_limit & 2047)) { 1211 /* Partition ends on a 1MB boundary, align to 1MB */ 1212 ptn_alignment = 2048; 1213 if (ptn_0_base <= 2048 1214 && !(ptn_0_base & (ptn_0_base - 1))) { 1215 /* ptn_base is a power of 2, use it */ 1216 ptn_0_offset = ptn_0_base; 1217 } 1218 } 1219 } else { 1220 /* Use 1MB alignment for large disks */ 1221 if (disksectors > 2048 * 1024 * 128) { 1222 ptn_alignment = 2048; 1223 ptn_0_offset = 2048; 1224 } 1225 } 1226 } 1227 1228 static void 1229 get_bios_geometry(void) 1230 { 1231 #if defined(USE_DISKLIST) 1232 int mib[2], i; 1233 size_t len; 1234 struct biosdisk_info *bip; 1235 struct nativedisk_info *nip; 1236 char diskname[8]; 1237 1238 mib[0] = CTL_MACHDEP; 1239 mib[1] = CPU_DISKINFO; 1240 if (sysctl(mib, 2, NULL, &len, NULL, 0) < 0) { 1241 goto out; 1242 } 1243 dl = (struct disklist *) malloc(len); 1244 if (dl == NULL) 1245 err(1, "Malloc failed"); 1246 if (sysctl(mib, 2, dl, &len, NULL, 0) < 0) { 1247 free(dl); 1248 dl = 0; 1249 goto out; 1250 } 1251 1252 get_diskname(disk, diskname, sizeof diskname); 1253 1254 for (i = 0; i < dl->dl_nnativedisks; i++) { 1255 nip = &dl->dl_nativedisks[i]; 1256 if (strcmp(diskname, nip->ni_devname)) 1257 continue; 1258 /* 1259 * XXX listing possible matches is better. This is ok for 1260 * now because the user has a chance to change it later. 1261 * Also, if all the disks have the same parameters then we can 1262 * just use them, we don't need to know which disk is which. 1263 */ 1264 if (nip->ni_nmatches != 0) { 1265 bip = &dl->dl_biosdisks[nip->ni_biosmatches[0]]; 1266 dos_cylinders = bip->bi_cyl; 1267 dos_heads = bip->bi_head; 1268 dos_sectors = bip->bi_sec; 1269 if (bip->bi_lbasecs) 1270 dos_disksectors = bip->bi_lbasecs; 1271 return; 1272 } 1273 } 1274 out: 1275 #endif 1276 /* Allright, allright, make a stupid guess.. */ 1277 intuit_translated_geometry(); 1278 } 1279 1280 #ifdef BOOTSEL 1281 static daddr_t 1282 get_default_boot(void) 1283 { 1284 unsigned int id; 1285 int p; 1286 1287 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1288 /* default to first active partition */ 1289 return DEFAULT_ACTIVE; 1290 1291 id = mboot.mbr_bootsel.mbrbs_defkey; 1292 1293 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII) { 1294 /* Keycode is ascii */ 1295 if (id == '\r') 1296 return DEFAULT_ACTIVE; 1297 /* '1'+ => allocated partition id, 'a'+ => disk 0+ */ 1298 if (id >= 'a' && id < 'a' + MAX_BIOS_DISKS) 1299 return DEFAULT_DISK(id - 'a'); 1300 id -= '1'; 1301 } else { 1302 /* keycode is PS/2 keycode */ 1303 if (id == SCAN_ENTER) 1304 return DEFAULT_ACTIVE; 1305 /* 1+ => allocated partition id, F1+ => disk 0+ */ 1306 if (id >= SCAN_F1 && id < SCAN_F1 + MAX_BIOS_DISKS) 1307 return DEFAULT_DISK(id - SCAN_F1); 1308 id -= SCAN_1; 1309 } 1310 1311 /* Convert partition index to the invariant start sector number */ 1312 1313 for (p = 0; p < MBR_PART_COUNT; p++) { 1314 if (mboot.mbr_parts[p].mbrp_type == 0) 1315 continue; 1316 if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0) 1317 continue; 1318 if (id-- == 0) 1319 return le32toh(mboot.mbr_parts[p].mbrp_start); 1320 } 1321 1322 for (p = 0; p < ext.num_ptn; p++) { 1323 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1324 continue; 1325 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1326 continue; 1327 if (id-- == 0) 1328 return ext_offset(p) 1329 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start); 1330 } 1331 1332 return DEFAULT_ACTIVE; 1333 } 1334 1335 static void 1336 set_default_boot(daddr_t default_ptn) 1337 { 1338 int p; 1339 static const unsigned char key_list[] = { SCAN_ENTER, SCAN_F1, SCAN_1, 1340 '\r', 'a', '1' }; 1341 const unsigned char *key = key_list; 1342 1343 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1344 /* sanity */ 1345 return; 1346 1347 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII) 1348 /* Use ascii values */ 1349 key += 3; 1350 1351 if (default_ptn == DEFAULT_ACTIVE) { 1352 mboot.mbr_bootsel.mbrbs_defkey = key[0]; 1353 return; 1354 } 1355 1356 if (default_ptn >= DEFAULT_DISK(0) 1357 && default_ptn < DEFAULT_DISK(MAX_BIOS_DISKS)) { 1358 mboot.mbr_bootsel.mbrbs_defkey = key[1] 1359 + default_ptn - DEFAULT_DISK(0); 1360 return; 1361 } 1362 1363 mboot.mbr_bootsel.mbrbs_defkey = key[2]; 1364 for (p = 0; p < MBR_PART_COUNT; p++) { 1365 if (mboot.mbr_parts[p].mbrp_type == 0) 1366 continue; 1367 if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0) 1368 continue; 1369 if (le32toh(mboot.mbr_parts[p].mbrp_start) == default_ptn) 1370 return; 1371 mboot.mbr_bootsel.mbrbs_defkey++; 1372 } 1373 1374 if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_EXTLBA) { 1375 for (p = 0; p < ext.num_ptn; p++) { 1376 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1377 continue; 1378 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1379 continue; 1380 if (le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) + 1381 ext_offset(p) == default_ptn) 1382 return; 1383 mboot.mbr_bootsel.mbrbs_defkey++; 1384 } 1385 } 1386 1387 /* Default to first active partition */ 1388 mboot.mbr_bootsel.mbrbs_defkey = key[0]; 1389 } 1390 1391 static void 1392 install_bootsel(int needed) 1393 { 1394 struct mbr_bootsel *mbs = &mboot.mbr_bootsel; 1395 int p; 1396 int ext13 = 0; 1397 const char *code; 1398 1399 needed |= MBR_BS_NEWMBR; /* need new bootsel code */ 1400 1401 /* Work out which boot code we need for this configuration */ 1402 for (p = 0; p < MBR_PART_COUNT; p++) { 1403 if (mboot.mbr_parts[p].mbrp_type == 0) 1404 continue; 1405 if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1406 break; 1407 if (mbs->mbrbs_nametab[p][0] == 0) 1408 continue; 1409 needed |= MBR_BS_ACTIVE; 1410 if (le32toh(mboot.mbr_parts[p].mbrp_start) >= dos_totalsectors) 1411 ext13 = MBR_BS_EXTINT13; 1412 } 1413 1414 for (p = 0; p < ext.num_ptn; p++) { 1415 if (ext.ptn[p].mbr_bootsel_magic != LE_MBR_BS_MAGIC) 1416 continue; 1417 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1418 continue; 1419 if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[p][0] == 0) 1420 continue; 1421 needed |= MBR_BS_EXTLBA | MBR_BS_ACTIVE; 1422 } 1423 1424 if (B_flag) 1425 needed |= MBR_BS_ACTIVE; 1426 1427 /* Is the installed code good enough ? */ 1428 if (!i_flag && (needed == 0 || 1429 (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC 1430 && (mbs->mbrbs_flags & needed) == needed))) { 1431 /* yes - just set flags */ 1432 mbs->mbrbs_flags |= ext13; 1433 return; 1434 } 1435 1436 /* ok - we need to replace the bootcode */ 1437 1438 if (f_flag && !(i_flag || B_flag)) { 1439 warnx("Installed bootfile doesn't support required options."); 1440 return; 1441 } 1442 1443 if (!f_flag && bootsize == 0 && !i_flag) 1444 /* Output an explanation for the 'update bootcode' prompt. */ 1445 printf("\n%s\n", 1446 "Installed bootfile doesn't support required options."); 1447 1448 /* Were we told a specific file ? (which we have already read) */ 1449 /* If so check that it supports what we need. */ 1450 if (bootsize != 0 && needed != 0 1451 && (bootcode[0].mbr_bootsel_magic != LE_MBR_BS_MAGIC 1452 || ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed))) { 1453 /* No it doesn't... */ 1454 if (f_flag) 1455 warnx("Bootfile %s doesn't support " 1456 "required bootsel options", boot_path ); 1457 /* But install it anyway */ 1458 else 1459 if (yesno("Bootfile %s doesn't support the required " 1460 "options,\ninstall default bootfile instead?", 1461 boot_path)) 1462 bootsize = 0; 1463 } 1464 1465 if (bootsize == 0) { 1466 /* Get name of bootfile that supports the required facilities */ 1467 code = DEFAULT_BOOTCODE; 1468 if (needed & MBR_BS_ACTIVE) 1469 code = DEFAULT_BOOTSELCODE; 1470 #ifdef DEFAULT_BOOTEXTCODE 1471 if (needed & MBR_BS_EXTLBA) 1472 code = DEFAULT_BOOTEXTCODE; 1473 #endif 1474 1475 bootsize = read_boot(code, bootcode, sizeof bootcode, 0); 1476 if (bootsize == 0) 1477 /* The old bootcode is better than no bootcode at all */ 1478 return; 1479 if ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed) 1480 warnx("Default bootfile %s doesn't support required " 1481 "options. Got flags 0x%x, wanted 0x%x\n", 1482 boot_path, bootcode[0].mbr_bootsel.mbrbs_flags, 1483 needed); 1484 } 1485 1486 if (!f_flag && !yesno("Update the bootcode from %s?", boot_path)) 1487 return; 1488 1489 init_sector0(0); 1490 1491 if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC) 1492 mbs->mbrbs_flags = bootcode[0].mbr_bootsel.mbrbs_flags | ext13; 1493 } 1494 1495 static daddr_t 1496 configure_bootsel(daddr_t default_ptn) 1497 { 1498 struct mbr_bootsel *mbs = &mboot.mbr_bootsel; 1499 int i, item, opt; 1500 int tmo; 1501 daddr_t *off; 1502 int num_bios_disks; 1503 1504 #if defined(USE_DISKLIST) 1505 if (dl != NULL) { 1506 num_bios_disks = dl->dl_nbiosdisks; 1507 if (num_bios_disks > MAX_BIOS_DISKS) 1508 num_bios_disks = MAX_BIOS_DISKS; 1509 } else 1510 #endif 1511 num_bios_disks = MAX_BIOS_DISKS; 1512 1513 printf("\nBoot selector configuration:\n"); 1514 1515 /* The timeout value is in ticks, ~18.2 Hz. Avoid using floats. 1516 * Ticks are nearly 64k/3600 - so our long timers are sligtly out! 1517 * Newer bootcode always waits for 1 tick, so treats 0xffff 1518 * as wait forever. 1519 */ 1520 tmo = le16toh(mbs->mbrbs_timeo); 1521 tmo = tmo == 0xffff ? -1 : (10 * tmo + 9) / 182; 1522 tmo = decimal("Timeout value (0 to 3600 seconds, -1 => never)", 1523 tmo, 0, -1, 3600); 1524 mbs->mbrbs_timeo = htole16(tmo == -1 ? 0xffff : (tmo * 182) / 10); 1525 1526 off = calloc(1 + MBR_PART_COUNT + ext.num_ptn + num_bios_disks, sizeof *off); 1527 if (off == NULL) 1528 err(1, "Malloc failed"); 1529 1530 printf("Select the default boot option. Options are:\n\n"); 1531 item = 0; 1532 opt = 0; 1533 off[opt] = DEFAULT_ACTIVE; 1534 printf("%d: The first active partition\n", opt); 1535 for (i = 0; i < MBR_PART_COUNT; i++) { 1536 if (mboot.mbr_parts[i].mbrp_type == 0) 1537 continue; 1538 if (mbs->mbrbs_nametab[i][0] == 0) 1539 continue; 1540 printf("%d: %s\n", ++opt, &mbs->mbrbs_nametab[i][0]); 1541 off[opt] = le32toh(mboot.mbr_parts[i].mbrp_start); 1542 if (off[opt] == default_ptn) 1543 item = opt; 1544 } 1545 if (mbs->mbrbs_flags & MBR_BS_EXTLBA) { 1546 for (i = 0; i < ext.num_ptn; i++) { 1547 if (ext.ptn[i].mbr_parts[0].mbrp_type == 0) 1548 continue; 1549 if (ext.ptn[i].mbr_bootsel.mbrbs_nametab[0][0] == 0) 1550 continue; 1551 printf("%d: %s\n", 1552 ++opt, ext.ptn[i].mbr_bootsel.mbrbs_nametab[0]); 1553 off[opt] = ext_offset(i) + 1554 le32toh(ext.ptn[i].mbr_parts[0].mbrp_start); 1555 if (off[opt] == default_ptn) 1556 item = opt; 1557 } 1558 } 1559 for (i = 0; i < num_bios_disks; i++) { 1560 printf("%d: Harddisk %d\n", ++opt, i); 1561 off[opt] = DEFAULT_DISK(i); 1562 if (DEFAULT_DISK(i) == default_ptn) 1563 item = opt; 1564 } 1565 1566 item = decimal("Default boot option", item, 0, 0, opt); 1567 1568 default_ptn = off[item]; 1569 free(off); 1570 return default_ptn; 1571 } 1572 #endif /* BOOTSEL */ 1573 1574 1575 /* Prerequisite: the disklabel parameters and master boot record must 1576 * have been read (i.e. dos_* and mboot are meaningful). 1577 * Specification: modifies dos_cylinders, dos_heads, dos_sectors, and 1578 * dos_cylindersectors to be consistent with what the 1579 * partition table is using, if we can find a geometry 1580 * which is consistent with all partition table entries. 1581 * We may get the number of cylinders slightly wrong (in 1582 * the conservative direction). The idea is to be able 1583 * to create a NetBSD partition on a disk we don't know 1584 * the translated geometry of. 1585 * This routine is only used for non-x86 systems or when we fail to 1586 * get the BIOS geometry from the kernel. 1587 */ 1588 static void 1589 intuit_translated_geometry(void) 1590 { 1591 uint32_t xcylinders; 1592 int xheads = -1, xsectors = -1, i, j; 1593 unsigned int c1, h1, s1, c2, h2, s2; 1594 unsigned long a1, a2; 1595 uint64_t num, denom; 1596 1597 /* 1598 * The physical parameters may be invalid as bios geometry. 1599 * If we cannot determine the actual bios geometry, we are 1600 * better off picking a likely 'faked' geometry than leaving 1601 * the invalid physical one. 1602 */ 1603 1604 if (dos_cylinders > MAXCYL || dos_heads > MAXHEAD || 1605 dos_sectors > MAXSECTOR) { 1606 h1 = MAXHEAD - 1; 1607 c1 = MAXCYL - 1; 1608 #if defined(USE_DISKLIST) 1609 if (dl != NULL) { 1610 /* BIOS may use 256 heads or 1024 cylinders */ 1611 for (i = 0; i < dl->dl_nbiosdisks; i++) { 1612 if (h1 < (unsigned int)dl->dl_biosdisks[i].bi_head) 1613 h1 = dl->dl_biosdisks[i].bi_head; 1614 if (c1 < (unsigned int)dl->dl_biosdisks[i].bi_cyl) 1615 c1 = dl->dl_biosdisks[i].bi_cyl; 1616 } 1617 } 1618 #endif 1619 dos_sectors = MAXSECTOR; 1620 dos_heads = h1; 1621 dos_cylinders = disklabel.d_secperunit / (MAXSECTOR * h1); 1622 if (dos_cylinders > c1) 1623 dos_cylinders = c1; 1624 } 1625 1626 /* Try to deduce the number of heads from two different mappings. */ 1627 for (i = 0; i < MBR_PART_COUNT * 2 - 1; i++) { 1628 if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) 1629 continue; 1630 a1 -= s1; 1631 for (j = i + 1; j < MBR_PART_COUNT * 2; j++) { 1632 if (get_mapping(j, &c2, &h2, &s2, &a2) < 0) 1633 continue; 1634 a2 -= s2; 1635 num = (uint64_t)h1 * a2 - (uint64_t)h2 * a1; 1636 denom = (uint64_t)c2 * a1 - (uint64_t)c1 * a2; 1637 if (denom != 0 && num != 0 && num % denom == 0) { 1638 xheads = num / denom; 1639 xsectors = a1 / (c1 * xheads + h1); 1640 break; 1641 } 1642 } 1643 if (xheads != -1) 1644 break; 1645 } 1646 1647 if (xheads == -1) { 1648 if (F_flag) 1649 return; 1650 warnx("Cannot determine the number of heads"); 1651 return; 1652 } 1653 1654 if (xsectors == -1) { 1655 warnx("Cannot determine the number of sectors"); 1656 return; 1657 } 1658 1659 /* Estimate the number of cylinders. */ 1660 xcylinders = disklabel.d_secperunit / xheads / xsectors; 1661 if (disklabel.d_secperunit > xcylinders * xheads * xsectors) 1662 xcylinders++; 1663 1664 /* 1665 * Now verify consistency with each of the partition table entries. 1666 * Be willing to shove cylinders up a little bit to make things work, 1667 * but translation mismatches are fatal. 1668 */ 1669 for (i = 0; i < MBR_PART_COUNT * 2; i++) { 1670 if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) 1671 continue; 1672 if (c1 >= MAXCYL - 2) 1673 continue; 1674 if (xsectors * (c1 * xheads + h1) + s1 != a1) 1675 return; 1676 } 1677 1678 1679 /* Everything checks out. 1680 * Reset the geometry to use for further calculations. 1681 * But cylinders cannot be > 1024. 1682 */ 1683 if (xcylinders > MAXCYL) 1684 dos_cylinders = MAXCYL; 1685 else 1686 dos_cylinders = xcylinders; 1687 dos_heads = xheads; 1688 dos_sectors = xsectors; 1689 } 1690 1691 /* 1692 * For the purposes of intuit_translated_geometry(), treat the partition 1693 * table as a list of eight mapping between (cylinder, head, sector) 1694 * triplets and absolute sectors. Get the relevant geometry triplet and 1695 * absolute sectors for a given entry, or return -1 if it isn't present. 1696 * Note: for simplicity, the returned sector is 0-based. 1697 */ 1698 static int 1699 get_mapping(int i, unsigned int *cylinder, unsigned int *head, unsigned int *sector, 1700 unsigned long *absolute) 1701 { 1702 struct mbr_partition *part = &mboot.mbr_parts[i / 2]; 1703 1704 if (part->mbrp_type == 0) 1705 return -1; 1706 if (i % 2 == 0) { 1707 *cylinder = MBR_PCYL(part->mbrp_scyl, part->mbrp_ssect); 1708 *head = part->mbrp_shd; 1709 *sector = MBR_PSECT(part->mbrp_ssect); 1710 *absolute = le32toh(part->mbrp_start); 1711 } else { 1712 *cylinder = MBR_PCYL(part->mbrp_ecyl, part->mbrp_esect); 1713 *head = part->mbrp_ehd; 1714 *sector = MBR_PSECT(part->mbrp_esect); 1715 *absolute = le32toh(part->mbrp_start) 1716 + le32toh(part->mbrp_size) - 1; 1717 } 1718 /* Sanity check the data against all zeroes */ 1719 if ((*cylinder == 0) && (*sector == 0) && (*head == 0)) 1720 return -1; 1721 /* sector numbers in the MBR partition table start at 1 */ 1722 *sector = *sector - 1; 1723 /* Sanity check the data against max values */ 1724 if ((((*cylinder * MAXHEAD) + *head) * MAXSECTOR + *sector) < *absolute) 1725 /* cannot be a CHS mapping */ 1726 return -1; 1727 return 0; 1728 } 1729 1730 static void 1731 delete_ptn(int part) 1732 { 1733 if (part == ext.ptn_id) { 1734 /* forget all about the extended partition */ 1735 free(ext.ptn); 1736 memset(&ext, 0, sizeof ext); 1737 } 1738 1739 mboot.mbr_parts[part].mbrp_type = 0; 1740 } 1741 1742 static void 1743 delete_ext_ptn(int part) 1744 { 1745 1746 if (part == 0) { 1747 ext.ptn[0].mbr_parts[0].mbrp_type = 0; 1748 return; 1749 } 1750 ext.ptn[part - 1].mbr_parts[1] = ext.ptn[part].mbr_parts[1]; 1751 memmove(&ext.ptn[part], &ext.ptn[part + 1], 1752 (ext.num_ptn - part - 1) * sizeof ext.ptn[0]); 1753 ext.num_ptn--; 1754 } 1755 1756 static int 1757 add_ext_ptn(daddr_t start, daddr_t size) 1758 { 1759 int part; 1760 struct mbr_partition *partp; 1761 struct mbr_sector *nptn; 1762 1763 nptn = realloc(ext.ptn, (ext.num_ptn + 1) * sizeof *ext.ptn); 1764 if (!nptn) 1765 err(1, "realloc"); 1766 ext.ptn = nptn; 1767 for (part = 0; part < ext.num_ptn; part++) 1768 if (ext_offset(part) > start) 1769 break; 1770 /* insert before 'part' - make space... */ 1771 memmove(&ext.ptn[part + 1], &ext.ptn[part], 1772 (ext.num_ptn - part) * sizeof ext.ptn[0]); 1773 memset(&ext.ptn[part], 0, sizeof ext.ptn[0]); 1774 ext.ptn[part].mbr_magic = LE_MBR_MAGIC; 1775 /* we will be 'part' */ 1776 if (part == 0) { 1777 /* link us to 'next' */ 1778 partp = &ext.ptn[0].mbr_parts[1]; 1779 /* offset will be fixed by caller */ 1780 partp->mbrp_size = htole32( 1781 le32toh(ext.ptn[1].mbr_parts[0].mbrp_start) + 1782 le32toh(ext.ptn[1].mbr_parts[0].mbrp_size)); 1783 } else { 1784 /* link us to prev's next */ 1785 partp = &ext.ptn[part - 1].mbr_parts[1]; 1786 ext.ptn[part].mbr_parts[1] = *partp; 1787 /* and prev onto us */ 1788 partp->mbrp_start = htole32(start - ptn_0_offset - ext.base); 1789 partp->mbrp_size = htole32(size + ptn_0_offset); 1790 } 1791 partp->mbrp_type = 5; /* as used by win98 */ 1792 partp->mbrp_flag = 0; 1793 /* wallop in some CHS values - win98 doesn't saturate them */ 1794 dos(le32toh(partp->mbrp_start), 1795 &partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect); 1796 dos(le32toh(partp->mbrp_start) + le32toh(partp->mbrp_size) - 1, 1797 &partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect); 1798 ext.num_ptn++; 1799 1800 return part; 1801 } 1802 1803 static const char * 1804 check_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix) 1805 { 1806 int p; 1807 unsigned int p_s, p_e; 1808 1809 if (sysid != 0) { 1810 if (start == 0) 1811 return "Sector zero is reserved for the MBR"; 1812 #if 0 1813 if (start < ptn_0_offset) 1814 /* This is just a convention, not a requirement */ 1815 return "Track zero is reserved for the BIOS"; 1816 #endif 1817 if (start + size > disksectors) 1818 return "Partition exceeds size of disk"; 1819 for (p = 0; p < MBR_PART_COUNT; p++) { 1820 if (p == part || mboot.mbr_parts[p].mbrp_type == 0) 1821 continue; 1822 p_s = le32toh(mboot.mbr_parts[p].mbrp_start); 1823 p_e = p_s + le32toh(mboot.mbr_parts[p].mbrp_size); 1824 if (start + size <= p_s || start >= p_e) 1825 continue; 1826 if (f_flag) { 1827 if (fix) 1828 delete_ptn(p); 1829 return 0; 1830 } 1831 return "Overlaps another partition"; 1832 } 1833 } 1834 1835 /* Are we trying to create an extended partition */ 1836 if (!MBR_IS_EXTENDED(mboot.mbr_parts[part].mbrp_type)) { 1837 /* this wasn't the extended partition */ 1838 if (!MBR_IS_EXTENDED(sysid)) 1839 return 0; 1840 /* making an extended partition */ 1841 if (ext.base != 0) { 1842 if (!f_flag) 1843 return "There cannot be 2 extended partitions"; 1844 if (fix) 1845 delete_ptn(ext.ptn_id); 1846 } 1847 if (fix) { 1848 /* allocate a new extended partition */ 1849 ext.ptn = calloc(1, sizeof ext.ptn[0]); 1850 if (ext.ptn == NULL) 1851 err(1, "Malloc failed"); 1852 ext.ptn[0].mbr_magic = LE_MBR_MAGIC; 1853 ext.ptn_id = part; 1854 ext.base = start; 1855 ext.limit = start + size; 1856 ext.num_ptn = 1; 1857 } 1858 return 0; 1859 } 1860 1861 /* Check we haven't cut space allocated to an extended ptn */ 1862 1863 if (!MBR_IS_EXTENDED(sysid)) { 1864 /* no longer an extended partition */ 1865 if (fix) { 1866 /* Kill all memory of the extended partitions */ 1867 delete_ptn(part); 1868 return 0; 1869 } 1870 if (ext.num_ptn == 0 || 1871 (ext.num_ptn == 1 && ext.ptn[0].mbr_parts[0].mbrp_type == 0)) 1872 /* nothing in extended partition */ 1873 return 0; 1874 if (f_flag) 1875 return 0; 1876 if (yesno("Do you really want to delete all the extended partitions?")) 1877 return 0; 1878 return "Extended partition busy"; 1879 } 1880 1881 if (le32toh(mboot.mbr_parts[part].mbrp_start) != ext.base) 1882 /* maybe impossible, but an extra sanity check */ 1883 return 0; 1884 1885 for (p = ext.num_ptn; --p >= 0;) { 1886 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1887 continue; 1888 p_s = ext_offset(p); 1889 p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1890 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 1891 if (p_s >= start && p_e <= start + size) 1892 continue; 1893 if (!f_flag) 1894 return "Extended partition outside main partition"; 1895 if (fix) 1896 delete_ext_ptn(p); 1897 } 1898 1899 if (fix && start != ext.base) { 1900 /* The internal offsets need to be fixed up */ 1901 for (p = 0; p < ext.num_ptn - 1; p++) 1902 ext.ptn[p].mbr_parts[1].mbrp_start = htole32( 1903 le32toh(ext.ptn[p].mbr_parts[1].mbrp_start) 1904 + ext.base - start); 1905 /* and maybe an empty partition at the start */ 1906 if (ext.ptn[0].mbr_parts[0].mbrp_type == 0) { 1907 if (le32toh(ext.ptn[0].mbr_parts[1].mbrp_start) == 0) { 1908 /* don't need the empty slot */ 1909 memmove(&ext.ptn[0], &ext.ptn[1], 1910 (ext.num_ptn - 1) * sizeof ext.ptn[0]); 1911 ext.num_ptn--; 1912 } 1913 } else { 1914 /* must create an empty slot */ 1915 add_ext_ptn(start, ptn_0_offset); 1916 ext.ptn[0].mbr_parts[1].mbrp_start = htole32(ext.base 1917 - start); 1918 } 1919 } 1920 if (fix) { 1921 ext.base = start; 1922 ext.limit = start + size; 1923 } 1924 return 0; 1925 } 1926 1927 static const char * 1928 check_ext_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix) 1929 { 1930 int p; 1931 unsigned int p_s, p_e; 1932 1933 if (sysid == 0) 1934 return 0; 1935 1936 if (MBR_IS_EXTENDED(sysid)) 1937 return "Nested extended partitions are not allowed"; 1938 1939 /* allow one track at start for extended partition header */ 1940 start -= ptn_0_offset; 1941 size += ptn_0_offset; 1942 if (start < ext.base || start + size > ext.limit) 1943 return "Outside bounds of extended partition"; 1944 1945 if (f_flag && !fix) 1946 return 0; 1947 1948 for (p = ext.num_ptn; --p >= 0;) { 1949 if (p == part || ext.ptn[p].mbr_parts[0].mbrp_type == 0) 1950 continue; 1951 p_s = ext_offset(p); 1952 p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1953 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 1954 if (p == 0) 1955 p_s += le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 1956 - ptn_0_offset; 1957 if (start < p_e && start + size > p_s) { 1958 if (!f_flag) 1959 return "Overlaps another extended partition"; 1960 if (fix) { 1961 if (part == -1) 1962 delete_ext_ptn(p); 1963 else 1964 /* must not change numbering yet */ 1965 ext.ptn[p].mbr_parts[0].mbrp_type = 0; 1966 } 1967 } 1968 } 1969 return 0; 1970 } 1971 1972 static int 1973 change_part(int extended, int part, int sysid, daddr_t start, daddr_t size, 1974 char *bootmenu) 1975 { 1976 struct mbr_partition *partp; 1977 struct mbr_sector *boot; 1978 daddr_t offset; 1979 const char *e; 1980 int upart = part; 1981 int p; 1982 int fl; 1983 daddr_t n_s, n_e; 1984 const char *errtext; 1985 #ifdef BOOTSEL 1986 char tmp_bootmenu[MBR_PART_COUNT * (MBR_BS_PARTNAMESIZE + 1)]; 1987 int bootmenu_len = (extended ? MBR_PART_COUNT : 1) * (MBR_BS_PARTNAMESIZE + 1); 1988 #endif 1989 1990 if (extended) { 1991 if (part != -1 && part < ext.num_ptn) { 1992 boot = &ext.ptn[part]; 1993 partp = &boot->mbr_parts[0]; 1994 offset = ext_offset(part); 1995 } else { 1996 part = -1; 1997 boot = 0; 1998 partp = 0; 1999 offset = 0; 2000 } 2001 upart = 0; 2002 e = "E"; 2003 } else { 2004 boot = &mboot; 2005 partp = &boot->mbr_parts[part]; 2006 offset = 0; 2007 e = ""; 2008 } 2009 2010 if (!f_flag && part != -1) { 2011 printf("The data for partition %s%d is:\n", e, part); 2012 print_part(boot, upart, offset); 2013 } 2014 2015 #ifdef BOOTSEL 2016 if (bootmenu != NULL) 2017 strlcpy(tmp_bootmenu, bootmenu, bootmenu_len); 2018 else 2019 if (boot != NULL && boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) 2020 strlcpy(tmp_bootmenu, 2021 boot->mbr_bootsel.mbrbs_nametab[upart], 2022 bootmenu_len); 2023 else 2024 tmp_bootmenu[0] = 0; 2025 #endif 2026 2027 if (!s_flag && partp != NULL) { 2028 /* values not specified, default to current ones */ 2029 sysid = partp->mbrp_type; 2030 start = offset + le32toh(partp->mbrp_start); 2031 size = le32toh(partp->mbrp_size); 2032 } 2033 2034 /* creating a new partition, default to free space */ 2035 if (!s_flag && sysid == 0 && extended) { 2036 /* non-extended partition */ 2037 start = ext.base; 2038 for (p = 0; p < ext.num_ptn; p++) { 2039 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2040 continue; 2041 n_s = ext_offset(p); 2042 if (n_s > start + ptn_0_offset) 2043 break; 2044 start = ext_offset(p) 2045 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 2046 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size); 2047 } 2048 if (ext.limit - start <= ptn_0_offset) { 2049 printf("No space in extended partition\n"); 2050 return 0; 2051 } 2052 start += ptn_0_offset; 2053 } 2054 2055 if (!s_flag && sysid == 0 && !extended) { 2056 /* same for non-extended partition */ 2057 /* first see if old start is free */ 2058 if (start < ptn_0_offset) 2059 start = 0; 2060 for (p = 0; start != 0 && p < MBR_PART_COUNT; p++) { 2061 if (mboot.mbr_parts[p].mbrp_type == 0) 2062 continue; 2063 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2064 if (start >= n_s && 2065 start < n_s + le32toh(mboot.mbr_parts[p].mbrp_size)) 2066 start = 0; 2067 } 2068 if (start == 0) { 2069 /* Look for first gap */ 2070 start = ptn_0_offset; 2071 for (p = 0; p < MBR_PART_COUNT; p++) { 2072 if (mboot.mbr_parts[p].mbrp_type == 0) 2073 continue; 2074 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2075 n_e = n_s + le32toh(mboot.mbr_parts[p].mbrp_size); 2076 if (start >= n_s && start < n_e) { 2077 start = n_e; 2078 p = -1; 2079 } 2080 } 2081 if (start >= disksectors && !I_flag) { 2082 printf("No free space\n"); 2083 return 0; 2084 } 2085 } 2086 } 2087 2088 if (!f_flag) { 2089 /* request new values from user */ 2090 if (sysid == 0) 2091 sysid = 169; 2092 sysid = decimal("sysid", sysid, 0, 0, 255); 2093 if (sysid == 0 && !v_flag) { 2094 start = 0; 2095 size = 0; 2096 #ifdef BOOTSEL 2097 tmp_bootmenu[0] = 0; 2098 #endif 2099 } else { 2100 daddr_t old = start; 2101 daddr_t lim = extended ? ext.limit : disksectors; 2102 start = decimal("start", start, 2103 DEC_SEC | DEC_RND_0 | (extended ? DEC_RND : 0), 2104 extended ? ext.base : 0, lim); 2105 /* Adjust 'size' so that end doesn't move when 'start' 2106 * is only changed slightly. 2107 */ 2108 if (size > start - old) 2109 size -= start - old; 2110 else 2111 size = 0; 2112 /* Find end of available space from this start point */ 2113 if (extended) { 2114 for (p = 0; p < ext.num_ptn; p++) { 2115 if (p == part) 2116 continue; 2117 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2118 continue; 2119 n_s = ext_offset(p); 2120 if (n_s > start && n_s < lim) 2121 lim = n_s; 2122 if (start >= n_s && start < n_s 2123 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) 2124 + le32toh(ext.ptn[p].mbr_parts[0].mbrp_size)) { 2125 lim = start; 2126 break; 2127 } 2128 } 2129 } else { 2130 for (p = 0; p < MBR_PART_COUNT; p++) { 2131 if (p == part) 2132 continue; 2133 if (mboot.mbr_parts[p].mbrp_type == 0) 2134 continue; 2135 n_s = le32toh(mboot.mbr_parts[p].mbrp_start); 2136 if (n_s > start && n_s < lim) 2137 lim = n_s; 2138 if (start >= n_s && start < n_s 2139 + le32toh(mboot.mbr_parts[p].mbrp_size)) { 2140 lim = start; 2141 break; 2142 } 2143 } 2144 } 2145 lim -= start; 2146 if (lim == 0) { 2147 printf("Start sector already allocated\n"); 2148 return 0; 2149 } 2150 if (size == 0 || size > lim) 2151 size = lim; 2152 fl = DEC_SEC; 2153 if (start % ptn_alignment == ptn_0_offset) 2154 fl |= DEC_RND_DOWN; 2155 if (start == 2 * ptn_0_offset) 2156 fl |= DEC_RND_DOWN | DEC_RND_DOWN_2; 2157 size = decimal("size", size, fl, 0, lim); 2158 #ifdef BOOTSEL 2159 #ifndef DEFAULT_BOOTEXTCODE 2160 if (!extended) 2161 #endif 2162 string("bootmenu", bootmenu_len, tmp_bootmenu); 2163 #endif 2164 } 2165 } 2166 2167 /* 2168 * Before we write these away, we must verify that nothing 2169 * untoward has been requested. 2170 */ 2171 2172 if (extended) 2173 errtext = check_ext_overlap(part, sysid, start, size, 0); 2174 else 2175 errtext = check_overlap(part, sysid, start, size, 0); 2176 if (errtext != NULL && !I_flag) { 2177 if (f_flag) 2178 errx(2, "%s\n", errtext); 2179 printf("%s\n", errtext); 2180 return 0; 2181 } 2182 2183 /* 2184 * Before proceeding, delete any overlapped partitions. 2185 * This can only happen if '-f' was supplied on the command line. 2186 * Just hope the caller knows what they are doing. 2187 * This also fixes the base of each extended partition if the 2188 * partition itself has moved. 2189 */ 2190 if (!I_flag) { 2191 if (extended) 2192 errtext = check_ext_overlap(part, sysid, start, size, 1); 2193 else 2194 errtext = check_overlap(part, sysid, start, size, 1); 2195 if (errtext) 2196 errx(1, "%s\n", errtext); 2197 } 2198 2199 2200 if (sysid == 0) { 2201 /* delete this partition - save info though */ 2202 if (partp == NULL) 2203 /* must have been trying to create an extended ptn */ 2204 return 0; 2205 if (start == 0 && size == 0) 2206 memset(partp, 0, sizeof *partp); 2207 #ifdef BOOTSEL 2208 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) 2209 memset(boot->mbr_bootsel.mbrbs_nametab[upart], 0, 2210 sizeof boot->mbr_bootsel.mbrbs_nametab[0]); 2211 #endif 2212 if (extended) 2213 delete_ext_ptn(part); 2214 else 2215 delete_ptn(part); 2216 return 1; 2217 } 2218 2219 2220 if (extended) { 2221 if (part != -1) 2222 delete_ext_ptn(part); 2223 if (start == ext.base + ptn_0_offset) 2224 /* First one must have been free */ 2225 part = 0; 2226 else 2227 part = add_ext_ptn(start, size); 2228 2229 /* These must be re-calculated because of the realloc */ 2230 boot = &ext.ptn[part]; 2231 partp = &boot->mbr_parts[0]; 2232 offset = ext_offset(part); 2233 } 2234 2235 partp->mbrp_type = sysid; 2236 partp->mbrp_start = htole32( start - offset); 2237 partp->mbrp_size = htole32( size); 2238 dos(start, &partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect); 2239 dos(start + size - 1, 2240 &partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect); 2241 #ifdef BOOTSEL 2242 if (extended) { 2243 boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC; 2244 strncpy(boot->mbr_bootsel.mbrbs_nametab[upart], tmp_bootmenu, 2245 bootmenu_len); 2246 } else { 2247 /* We need to bootselect code installed in order to have 2248 * somewhere to safely write the menu tag. 2249 */ 2250 if (boot->mbr_bootsel_magic != LE_MBR_BS_MAGIC) { 2251 if (f_flag || 2252 yesno("The bootselect code is not installed, " 2253 "do you want to install it now?")) 2254 install_bootsel(MBR_BS_ACTIVE); 2255 } 2256 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 2257 strncpy(boot->mbr_bootsel.mbrbs_nametab[upart], 2258 tmp_bootmenu, bootmenu_len); 2259 } 2260 } 2261 #endif 2262 2263 if (v_flag && !f_flag && yesno("Explicitly specify beg/end address?")) { 2264 /* this really isn't a good idea.... */ 2265 int tsector, tcylinder, thead; 2266 2267 tcylinder = MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect); 2268 thead = partp->mbrp_shd; 2269 tsector = MBR_PSECT(partp->mbrp_ssect); 2270 tcylinder = decimal("beginning cylinder", 2271 tcylinder, 0, 0, dos_cylinders - 1); 2272 thead = decimal("beginning head", 2273 thead, 0, 0, dos_heads - 1); 2274 tsector = decimal("beginning sector", 2275 tsector, 0, 1, dos_sectors); 2276 partp->mbrp_scyl = DOSCYL(tcylinder); 2277 partp->mbrp_shd = thead; 2278 partp->mbrp_ssect = DOSSECT(tsector, tcylinder); 2279 2280 tcylinder = MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect); 2281 thead = partp->mbrp_ehd; 2282 tsector = MBR_PSECT(partp->mbrp_esect); 2283 tcylinder = decimal("ending cylinder", 2284 tcylinder, 0, 0, dos_cylinders - 1); 2285 thead = decimal("ending head", 2286 thead, 0, 0, dos_heads - 1); 2287 tsector = decimal("ending sector", 2288 tsector, 0, 1, dos_sectors); 2289 partp->mbrp_ecyl = DOSCYL(tcylinder); 2290 partp->mbrp_ehd = thead; 2291 partp->mbrp_esect = DOSSECT(tsector, tcylinder); 2292 } 2293 2294 /* If we had to mark an extended partition as deleted because 2295 * another request would have overlapped it, now is the time 2296 * to do the actual delete. 2297 */ 2298 if (extended && f_flag) { 2299 for (p = ext.num_ptn; --p >= 0;) 2300 if (ext.ptn[p].mbr_parts[0].mbrp_type == 0) 2301 delete_ext_ptn(p); 2302 } 2303 return 1; 2304 } 2305 2306 static void 2307 print_geometry(void) 2308 { 2309 2310 if (sh_flag) { 2311 printf("DISK=%s\n", disk); 2312 printf("DLCYL=%d\nDLHEAD=%d\nDLSEC=%d\nDLSIZE=%"PRIdaddr"\n", 2313 cylinders, heads, sectors, disksectors); 2314 printf("BCYL=%d\nBHEAD=%d\nBSEC=%d\nBDLSIZE=%"PRIdaddr"\n", 2315 dos_cylinders, dos_heads, dos_sectors, dos_disksectors); 2316 printf("NUMEXTPTN=%d\n", ext.num_ptn); 2317 return; 2318 } 2319 2320 /* Not sh_flag */ 2321 printf("Disk: %s\n", disk); 2322 printf("NetBSD disklabel disk geometry:\n"); 2323 printf("cylinders: %d, heads: %d, sectors/track: %d " 2324 "(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr"\n\n", 2325 cylinders, heads, sectors, cylindersectors, disksectors); 2326 printf("BIOS disk geometry:\n"); 2327 printf("cylinders: %d, heads: %d, sectors/track: %d " 2328 "(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr"\n\n", 2329 dos_cylinders, dos_heads, dos_sectors, dos_cylindersectors, 2330 dos_disksectors); 2331 printf("Partitions aligned to %d sector boundaries, offset %d\n\n", 2332 ptn_alignment, ptn_0_offset); 2333 } 2334 2335 /* Find the first active partition, else return MBR_PART_COUNT */ 2336 static int 2337 first_active(void) 2338 { 2339 struct mbr_partition *partp = &mboot.mbr_parts[0]; 2340 int part; 2341 2342 for (part = 0; part < MBR_PART_COUNT; part++) 2343 if (partp[part].mbrp_flag & MBR_PFLAG_ACTIVE) 2344 return part; 2345 return MBR_PART_COUNT; 2346 } 2347 2348 static void 2349 change_active(int which) 2350 { 2351 struct mbr_partition *partp; 2352 int part; 2353 int active = MBR_PART_COUNT; 2354 2355 partp = &mboot.mbr_parts[0]; 2356 2357 if (a_flag && which != -1) 2358 active = which; 2359 else 2360 active = first_active(); 2361 if (!f_flag) { 2362 if (yesno("Do you want to change the active partition?")) { 2363 printf ("Choosing %d will make no partition active.\n", 2364 MBR_PART_COUNT); 2365 do { 2366 active = decimal("active partition", 2367 active, 0, 0, MBR_PART_COUNT); 2368 } while (!yesno("Are you happy with this choice?")); 2369 } else 2370 return; 2371 } else 2372 if (active != MBR_PART_COUNT) 2373 printf ("Making partition %d active.\n", active); 2374 2375 for (part = 0; part < MBR_PART_COUNT; part++) 2376 partp[part].mbrp_flag &= ~MBR_PFLAG_ACTIVE; 2377 if (active < MBR_PART_COUNT) 2378 partp[active].mbrp_flag |= MBR_PFLAG_ACTIVE; 2379 } 2380 2381 static void 2382 change_bios_geometry(void) 2383 { 2384 print_geometry(); 2385 if (!yesno("Do you want to change our idea of what BIOS thinks?")) 2386 return; 2387 2388 #if defined(USE_DISKLIST) 2389 if (dl != NULL) { 2390 struct biosdisk_info *bip; 2391 int i; 2392 2393 for (i = 0; i < dl->dl_nbiosdisks; i++) { 2394 if (i == 0) 2395 printf("\nGeometries of known disks:\n"); 2396 bip = &dl->dl_biosdisks[i]; 2397 printf("Disk %d: cylinders %u, heads %u, sectors %u" 2398 " (%"PRIdaddr" sectors, %dMB)\n", 2399 i, bip->bi_cyl, bip->bi_head, bip->bi_sec, 2400 bip->bi_lbasecs, SEC_TO_MB(bip->bi_lbasecs)); 2401 2402 } 2403 printf("\n"); 2404 } 2405 #endif 2406 do { 2407 dos_cylinders = decimal("BIOS's idea of #cylinders", 2408 dos_cylinders, 0, 0, MAXCYL); 2409 dos_heads = decimal("BIOS's idea of #heads", 2410 dos_heads, 0, 0, MAXHEAD); 2411 dos_sectors = decimal("BIOS's idea of #sectors", 2412 dos_sectors, 0, 1, MAXSECTOR); 2413 print_geometry(); 2414 } while (!yesno("Are you happy with this choice?")); 2415 } 2416 2417 2418 /***********************************************\ 2419 * Change real numbers into strange dos numbers * 2420 \***********************************************/ 2421 static void 2422 dos(int sector, unsigned char *cylinderp, unsigned char *headp, 2423 unsigned char *sectorp) 2424 { 2425 int cylinder, head; 2426 2427 cylinder = sector / dos_cylindersectors; 2428 sector -= cylinder * dos_cylindersectors; 2429 2430 head = sector / dos_sectors; 2431 sector -= head * dos_sectors; 2432 if (cylinder > 1023) 2433 cylinder = 1023; 2434 2435 *cylinderp = DOSCYL(cylinder); 2436 *headp = head; 2437 *sectorp = DOSSECT(sector + 1, cylinder); 2438 } 2439 2440 static int 2441 open_disk(int update) 2442 { 2443 static char namebuf[MAXPATHLEN + 1]; 2444 int flags = update && disk_file == NULL ? O_RDWR : O_RDONLY; 2445 2446 if (!F_flag) { 2447 fd = opendisk(disk, flags, namebuf, sizeof(namebuf), 0); 2448 if (fd < 0) { 2449 if (errno == ENODEV) 2450 warnx("%s is not a character device", namebuf); 2451 else 2452 warn("cannot opendisk %s", namebuf); 2453 return (-1); 2454 } 2455 disk = namebuf; 2456 } else { 2457 fd = open(disk, flags, 0); 2458 if (fd == -1) { 2459 warn("cannot open %s", disk); 2460 return -1; 2461 } 2462 } 2463 2464 if (get_params() == -1) { 2465 close(fd); 2466 fd = -1; 2467 return (-1); 2468 } 2469 if (disk_file != NULL) { 2470 /* for testing: read/write data from a disk file */ 2471 wfd = open(disk_file, update ? O_RDWR|O_CREAT : O_RDONLY, 0777); 2472 if (wfd == -1) { 2473 warn("%s", disk_file); 2474 close(fd); 2475 fd = -1; 2476 return -1; 2477 } 2478 } else 2479 wfd = fd; 2480 return (0); 2481 } 2482 2483 static ssize_t 2484 read_disk(daddr_t sector, void *buf) 2485 { 2486 ssize_t nr; 2487 2488 if (*rfd == -1) 2489 errx(1, "read_disk(); fd == -1"); 2490 2491 off_t offs = sector * (off_t)512; 2492 off_t mod = offs & (secsize - 1); 2493 off_t rnd = offs & ~(secsize - 1); 2494 2495 if (lseek(*rfd, rnd, SEEK_SET) == (off_t)-1) 2496 return -1; 2497 2498 if (secsize == 512) 2499 return read(*rfd, buf, 512); 2500 2501 if ((nr = read(*rfd, iobuf, secsize)) != secsize) 2502 return nr; 2503 2504 memcpy(buf, &iobuf[mod], 512); 2505 2506 return 512; 2507 } 2508 2509 static ssize_t 2510 write_disk(daddr_t sector, void *buf) 2511 { 2512 ssize_t nr; 2513 2514 if (wfd == -1) 2515 errx(1, "write_disk(); wfd == -1"); 2516 2517 off_t offs = sector * (off_t)512; 2518 off_t mod = offs & (secsize - 1); 2519 off_t rnd = offs & ~(secsize - 1); 2520 2521 if (lseek(wfd, rnd, SEEK_SET) == (off_t)-1) 2522 return -1; 2523 2524 if (secsize == 512) 2525 return write(wfd, buf, 512); 2526 2527 if ((nr = read(wfd, iobuf, secsize)) != secsize) 2528 return nr; 2529 2530 if (lseek(wfd, rnd, SEEK_SET) == (off_t)-1) 2531 return -1; 2532 2533 memcpy(&iobuf[mod], buf, 512); 2534 2535 if ((nr = write(wfd, iobuf, secsize)) != secsize) 2536 return nr; 2537 2538 return 512; 2539 } 2540 2541 static void 2542 guess_geometry(daddr_t _sectors) 2543 { 2544 dos_sectors = MAXSECTOR; 2545 dos_heads = MAXHEAD - 1; /* some BIOS might use 256 */ 2546 dos_cylinders = _sectors / (MAXSECTOR * (MAXHEAD - 1)); 2547 if (dos_cylinders < 1) 2548 dos_cylinders = 1; 2549 else if (dos_cylinders > MAXCYL - 1) 2550 dos_cylinders = MAXCYL - 1; 2551 } 2552 2553 static int 2554 get_params(void) 2555 { 2556 if (disk_type != NULL) { 2557 struct disklabel *tmplabel; 2558 2559 if ((tmplabel = getdiskbyname(disk_type)) == NULL) { 2560 warn("bad disktype"); 2561 return (-1); 2562 } 2563 disklabel = *tmplabel; 2564 } else if (F_flag) { 2565 struct stat st; 2566 if (fstat(fd, &st) == -1) { 2567 warn("fstat"); 2568 return (-1); 2569 } 2570 if (st.st_size % 512 != 0) { 2571 warnx("%s size (%lld) is not divisible " 2572 "by sector size (%d)", disk, (long long)st.st_size, 2573 512); 2574 } 2575 disklabel.d_secperunit = st.st_size / 512; 2576 guess_geometry(disklabel.d_secperunit); 2577 disklabel.d_ncylinders = dos_cylinders; 2578 disklabel.d_ntracks = dos_heads; 2579 disklabel.d_nsectors = dos_sectors; 2580 } else if (ioctl(fd, DIOCGDEFLABEL, &disklabel) == -1) { 2581 warn("DIOCGDEFLABEL"); 2582 if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { 2583 warn("DIOCGDINFO"); 2584 return (-1); 2585 } 2586 } 2587 2588 disksectors = disklabel.d_secperunit; 2589 cylinders = disklabel.d_ncylinders; 2590 heads = disklabel.d_ntracks; 2591 sectors = disklabel.d_nsectors; 2592 2593 /* pick up some defaults for the BIOS sizes */ 2594 if (sectors <= MAXSECTOR) { 2595 dos_cylinders = cylinders; 2596 dos_heads = heads; 2597 dos_sectors = sectors; 2598 } else { 2599 /* guess - has to better than the above */ 2600 guess_geometry(disksectors); 2601 } 2602 dos_disksectors = disksectors; 2603 2604 return (0); 2605 } 2606 2607 #ifdef BOOTSEL 2608 /* 2609 * Rather unfortunately the bootsel 'magic' number is at the end of the 2610 * the structure, and there is no checksum. So when other operating 2611 * systems install mbr code by only writing the length of their code they 2612 * can overwrite part of the structure but keeping the magic number intact. 2613 * This code attempts to empirically detect this problem. 2614 */ 2615 static int 2616 validate_bootsel(struct mbr_bootsel *mbs) 2617 { 2618 unsigned int key = mbs->mbrbs_defkey; 2619 unsigned int tmo; 2620 size_t i; 2621 2622 if (v_flag) 2623 return 0; 2624 2625 /* 2626 * Check default key is sane 2627 * - this is the most likely field to be stuffed 2628 * 16 disks and 16 bootable partitions seems enough! 2629 * (the keymap decode starts falling apart at that point) 2630 */ 2631 if (mbs->mbrbs_flags & MBR_BS_ASCII) { 2632 if (key != 0 && !(key == '\r' 2633 || (key >= '1' && key < '1' + MAX_BIOS_DISKS) 2634 || (key >= 'a' && key < 'a' + MAX_BIOS_DISKS))) 2635 return 1; 2636 } else { 2637 if (key != 0 && !(key == SCAN_ENTER 2638 || (key >= SCAN_1 && key < SCAN_1 + MAX_BIOS_DISKS) 2639 || (key >= SCAN_F1 && key < SCAN_F1 + MAX_BIOS_DISKS))) 2640 return 1; 2641 } 2642 2643 /* Checking the flags will lead to breakage... */ 2644 2645 /* Timeout value is expected to be a multiple of a second */ 2646 tmo = htole16(mbs->mbrbs_timeo); 2647 if (tmo != 0 && tmo != 0xffff && tmo != (10 * tmo + 9) / 182 * 182 / 10) 2648 return 2; 2649 2650 /* Check the menu strings are printable */ 2651 /* Unfortunately they aren't zero filled... */ 2652 for (i = 0; i < sizeof(mbs->mbrbs_nametab); i++) { 2653 int c = (uint8_t)mbs->mbrbs_nametab[0][i]; 2654 if (c == 0 || isprint(c)) 2655 continue; 2656 return 3; 2657 } 2658 2659 return 0; 2660 } 2661 #endif 2662 2663 static int 2664 read_s0(daddr_t offset, struct mbr_sector *boot) 2665 { 2666 const char *tabletype = offset ? "extended" : "primary"; 2667 #ifdef BOOTSEL 2668 static int reported; 2669 #endif 2670 2671 if (read_disk(offset, boot) == -1) { 2672 warn("Can't read %s partition table", tabletype); 2673 return -1; 2674 } 2675 if (boot->mbr_magic != LE_MBR_MAGIC) { 2676 if (F_flag && boot->mbr_magic == 0) 2677 return -1; 2678 warnx("%s partition table invalid, " 2679 "no magic in sector %"PRIdaddr, tabletype, offset); 2680 return -1; 2681 2682 } 2683 #ifdef BOOTSEL 2684 if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) { 2685 /* mbr_bootsel in new location */ 2686 if (validate_bootsel(&boot->mbr_bootsel)) { 2687 warnx("removing corrupt bootsel information"); 2688 boot->mbr_bootsel_magic = 0; 2689 } 2690 return 0; 2691 } 2692 if (boot->mbr_bootsel_magic != LE_MBR_MAGIC) 2693 return 0; 2694 2695 /* mbr_bootsel in old location */ 2696 if (!reported) 2697 warnx("%s partition table: using old-style bootsel information", 2698 tabletype); 2699 reported = 1; 2700 if (validate_bootsel((void *)((uint8_t *)boot + MBR_BS_OFFSET + 4))) { 2701 warnx("%s bootsel information corrupt - ignoring", tabletype); 2702 return 0; 2703 } 2704 memmove((uint8_t *)boot + MBR_BS_OFFSET, 2705 (uint8_t *)boot + MBR_BS_OFFSET + 4, 2706 sizeof(struct mbr_bootsel)); 2707 if ( ! (boot->mbr_bootsel.mbrbs_flags & MBR_BS_NEWMBR)) { 2708 /* old style default key */ 2709 int id; 2710 /* F1..F4 => ptn 0..3, F5+ => disk 0+ */ 2711 id = boot->mbr_bootsel.mbrbs_defkey; 2712 id -= SCAN_F1; 2713 if (id >= MBR_PART_COUNT) 2714 id -= MBR_PART_COUNT; /* Use number of disk */ 2715 else if (mboot.mbr_parts[id].mbrp_type != 0) 2716 id = le32toh(boot->mbr_parts[id].mbrp_start); 2717 else 2718 id = DEFAULT_ACTIVE; 2719 boot->mbr_bootsel.mbrbs_defkey = id; 2720 } 2721 boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC; 2722 /* highlight that new bootsel code is necessary */ 2723 boot->mbr_bootsel.mbrbs_flags &= ~MBR_BS_NEWMBR; 2724 #endif /* BOOTSEL */ 2725 return 0; 2726 } 2727 2728 static int 2729 write_mbr(void) 2730 { 2731 int flag, i; 2732 daddr_t offset; 2733 int rval = -1; 2734 2735 /* 2736 * write enable label sector before write (if necessary), 2737 * disable after writing. 2738 * needed if the disklabel protected area also protects 2739 * sector 0. (e.g. empty disk) 2740 */ 2741 flag = 1; 2742 if (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0) 2743 warn("DIOCWLABEL"); 2744 if (write_disk(0, &mboot) == -1) { 2745 warn("Can't write fdisk partition table"); 2746 goto protect_label; 2747 } 2748 if (boot_installed) 2749 for (i = bootsize; (i -= 0x200) > 0;) 2750 if (write_disk(i / 0x200, &bootcode[i / 0x200]) == -1) { 2751 warn("Can't write bootcode"); 2752 goto protect_label; 2753 } 2754 for (offset = 0, i = 0; i < ext.num_ptn; i++) { 2755 if (write_disk(ext.base + offset, ext.ptn + i) == -1) { 2756 warn("Can't write %dth extended partition", i); 2757 goto protect_label; 2758 } 2759 offset = le32toh(ext.ptn[i].mbr_parts[1].mbrp_start); 2760 } 2761 rval = 0; 2762 protect_label: 2763 flag = 0; 2764 if (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0) 2765 warn("DIOCWLABEL"); 2766 return rval; 2767 } 2768 2769 static int 2770 yesno(const char *str, ...) 2771 { 2772 int ch, first; 2773 va_list ap; 2774 2775 va_start(ap, str); 2776 vprintf(str, ap); 2777 va_end(ap); 2778 printf(" [n] "); 2779 2780 first = ch = getchar(); 2781 while (ch != '\n' && ch != EOF) 2782 ch = getchar(); 2783 if (ch == EOF) 2784 errx(1, "EOF"); 2785 return (first == 'y' || first == 'Y'); 2786 } 2787 2788 static int64_t 2789 decimal(const char *prompt, int64_t dflt, int flags, int64_t minval, int64_t maxval) 2790 { 2791 int64_t acc = 0; 2792 int valid; 2793 int len; 2794 char *cp; 2795 2796 for (;;) { 2797 if (flags & DEC_SEC) { 2798 printf("%s: [%" PRId64 "..%" PRId64 "cyl default: %" PRId64 ", %" PRId64 "cyl, %uMB] ", 2799 prompt, SEC_TO_CYL(minval), SEC_TO_CYL(maxval), 2800 dflt, SEC_TO_CYL(dflt), SEC_TO_MB(dflt)); 2801 } else 2802 printf("%s: [%" PRId64 "..%" PRId64 " default: %" PRId64 "] ", 2803 prompt, minval, maxval, dflt); 2804 2805 if (!fgets(lbuf, LBUF, stdin)) 2806 errx(1, "EOF"); 2807 cp = lbuf; 2808 2809 cp += strspn(cp, " \t"); 2810 if (*cp == '\n') 2811 return dflt; 2812 2813 if (cp[0] == '$' && cp[1] == '\n') 2814 return maxval; 2815 2816 if (isdigit((unsigned char)*cp) || *cp == '-') { 2817 acc = strtoll(lbuf, &cp, 10); 2818 len = strcspn(cp, " \t\n"); 2819 valid = 0; 2820 if (len != 0 && (flags & DEC_SEC)) { 2821 if (!strncasecmp(cp, "gb", len)) { 2822 acc *= 1024; 2823 valid = 1; 2824 } 2825 if (valid || !strncasecmp(cp, "mb", len)) { 2826 acc *= SEC_IN_1M; 2827 /* round to whole number of cylinders */ 2828 acc += ptn_alignment / 2; 2829 acc /= ptn_alignment; 2830 valid = 1; 2831 } 2832 if (valid || !strncasecmp(cp, "cyl", len)) { 2833 acc *= ptn_alignment; 2834 /* adjustments for cylinder boundary */ 2835 if (acc == 0 && flags & DEC_RND_0) 2836 acc += ptn_0_offset; 2837 if (flags & DEC_RND) 2838 acc += ptn_0_offset; 2839 if (flags & DEC_RND_DOWN) 2840 acc -= ptn_0_offset; 2841 if (flags & DEC_RND_DOWN_2) 2842 acc -= ptn_0_offset; 2843 cp += len; 2844 } 2845 } 2846 } 2847 2848 cp += strspn(cp, " \t"); 2849 if (*cp != '\n') { 2850 lbuf[strlen(lbuf) - 1] = 0; 2851 printf("%s is not a valid %s number.\n", lbuf, 2852 flags & DEC_SEC ? "sector" : "decimal"); 2853 continue; 2854 } 2855 2856 if (acc >= minval && acc <= maxval) 2857 return acc; 2858 printf("%" PRId64 " is not between %" PRId64 " and %" PRId64 ".\n", acc, minval, maxval); 2859 } 2860 } 2861 2862 static int 2863 ptn_id(const char *prompt, int *extended) 2864 { 2865 unsigned int acc = 0; 2866 char *cp; 2867 2868 for (;; printf("%s is not a valid partition number.\n", lbuf)) { 2869 printf("%s: [none] ", prompt); 2870 2871 if (!fgets(lbuf, LBUF, stdin)) 2872 errx(1, "EOF"); 2873 lbuf[strlen(lbuf)-1] = '\0'; 2874 cp = lbuf; 2875 2876 cp += strspn(cp, " \t"); 2877 *extended = 0; 2878 if (*cp == 0) 2879 return -1; 2880 2881 if (*cp == 'E' || *cp == 'e') { 2882 cp++; 2883 *extended = 1; 2884 } 2885 2886 acc = strtoul(cp, &cp, 10); 2887 2888 cp += strspn(cp, " \t"); 2889 if (*cp != '\0') 2890 continue; 2891 2892 if (*extended || acc < MBR_PART_COUNT) 2893 return acc; 2894 } 2895 } 2896 2897 #ifdef BOOTSEL 2898 static void 2899 string(const char *prompt, int length, char *buf) 2900 { 2901 int len; 2902 2903 for (;;) { 2904 printf("%s: [%.*s] ", prompt, length, buf); 2905 2906 if (!fgets(lbuf, LBUF, stdin)) 2907 errx(1, "EOF"); 2908 len = strlen(lbuf); 2909 if (len <= 1) 2910 /* unchanged if just <enter> */ 2911 return; 2912 /* now strip trailing spaces, <space><enter> deletes string */ 2913 do 2914 lbuf[--len] = 0; 2915 while (len != 0 && lbuf[len - 1] == ' '); 2916 if (len < length) 2917 break; 2918 printf("'%s' is longer than %d characters.\n", 2919 lbuf, length - 1); 2920 } 2921 strncpy(buf, lbuf, length); 2922 } 2923 #endif 2924 2925 static int 2926 type_match(const void *key, const void *item) 2927 { 2928 const int *idp = key; 2929 const struct mbr_ptype *ptr = item; 2930 2931 if (*idp < ptr->id) 2932 return (-1); 2933 if (*idp > ptr->id) 2934 return (1); 2935 return (0); 2936 } 2937 2938 static const char * 2939 get_type(int type) 2940 { 2941 struct mbr_ptype *ptr; 2942 2943 ptr = bsearch(&type, mbr_ptypes, KNOWN_SYSIDS, 2944 sizeof(mbr_ptypes[0]), type_match); 2945 if (ptr == 0) 2946 return ("unknown"); 2947 return (ptr->name); 2948 } 2949 2950 static int 2951 read_gpt(daddr_t offset, struct gpt_hdr *gptp) 2952 { 2953 char buf[512]; 2954 struct gpt_hdr *hdr = (void *)buf; 2955 const char *tabletype = GPT_TYPE(offset); 2956 2957 if (read_disk(offset, buf) == -1) { 2958 warn("Can't read %s GPT header", tabletype); 2959 return -1; 2960 } 2961 (void)memcpy(gptp, buf, GPT_HDR_SIZE); 2962 2963 /* GPT CRC should be calculated with CRC field preset to zero */ 2964 hdr->hdr_crc_self = 0; 2965 2966 if (memcmp(gptp->hdr_sig, GPT_HDR_SIG, sizeof(gptp->hdr_sig)) 2967 || gptp->hdr_lba_self != (uint64_t)offset 2968 || crc32(0, (void *)hdr, gptp->hdr_size) != gptp->hdr_crc_self) { 2969 /* not a GPT */ 2970 (void)memset(gptp, 0, GPT_HDR_SIZE); 2971 } 2972 2973 if (v_flag && gptp->hdr_size != 0) { 2974 printf("Found %s GPT header CRC %"PRIu32" " 2975 "at sector %"PRIdaddr", backup at %"PRIdaddr"\n", 2976 tabletype, gptp->hdr_crc_self, offset, gptp->hdr_lba_alt); 2977 } 2978 return gptp->hdr_size; 2979 2980 } 2981 2982 static int 2983 delete_gpt(struct gpt_hdr *gptp) 2984 { 2985 char buf[512]; 2986 struct gpt_hdr *hdr = (void *)buf; 2987 2988 if (gptp->hdr_size == 0) 2989 return 0; 2990 2991 /* don't accidently overwrite something important */ 2992 if (gptp->hdr_lba_self != GPT_HDR_BLKNO && 2993 gptp->hdr_lba_self != (uint64_t)disksectors - 1) { 2994 warnx("given GPT header location doesn't seem correct"); 2995 return -1; 2996 } 2997 2998 (void)memcpy(buf, gptp, GPT_HDR_SIZE); 2999 /* 3000 * Don't really delete GPT, just "disable" it, so it can 3001 * be recovered later in case of mistake or something 3002 */ 3003 (void)memset(hdr->hdr_sig, 0, sizeof(gptp->hdr_sig)); 3004 if (write_disk(gptp->hdr_lba_self, hdr) == -1) { 3005 warn("can't delete %s GPT header", 3006 GPT_TYPE(gptp->hdr_lba_self)); 3007 return -1; 3008 } 3009 (void)memset(gptp, 0, GPT_HDR_SIZE); 3010 return 1; 3011 } 3012
Indexes created Wed Oct 15 07:09:58 GMT 2025