1 /* 2 * Mach Operating System 3 * Copyright (c) 1992 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/disk.h> 31 #include <sys/disklabel.h> 32 #include <sys/diskmbr.h> 33 #include <sys/endian.h> 34 #include <sys/param.h> 35 #include <sys/stat.h> 36 #include <sys/mount.h> 37 #include <ctype.h> 38 #include <fcntl.h> 39 #include <err.h> 40 #include <errno.h> 41 #include <libgeom.h> 42 #include <paths.h> 43 #include <regex.h> 44 #include <stdint.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 int iotest; 51 52 #define LBUF 100 53 static char lbuf[LBUF]; 54 55 /* 56 * 57 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 58 * 59 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 60 * Copyright (c) 1989 Robert. V. Baron 61 * Created. 62 */ 63 64 #define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp 65 66 #define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 67 68 #define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 69 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 70 static int secsize = 0; /* the sensed sector size */ 71 72 static char *disk; 73 74 static int cyls, sectors, heads, cylsecs, disksecs; 75 76 struct mboot { 77 unsigned char padding[2]; /* force the longs to be long aligned */ 78 unsigned char *bootinst; /* boot code */ 79 off_t bootinst_size; 80 struct dos_partition parts[NDOSPART]; 81 }; 82 83 static struct mboot mboot; 84 static int fd; 85 86 #define ACTIVE 0x80 87 88 static uint dos_cyls; 89 static uint dos_heads; 90 static uint dos_sectors; 91 static uint dos_cylsecs; 92 93 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 94 #define DOSCYL(c) (c & 0xff) 95 96 #define MAX_ARGS 10 97 98 static int current_line_number; 99 100 static int geom_processed = 0; 101 static int part_processed = 0; 102 static int active_processed = 0; 103 104 typedef struct cmd { 105 char cmd; 106 int n_args; 107 struct arg { 108 char argtype; 109 int arg_val; 110 } args[MAX_ARGS]; 111 } CMD; 112 113 static int B_flag = 0; /* replace boot code */ 114 static int I_flag = 0; /* use entire disk for FreeBSD */ 115 static int a_flag = 0; /* set active partition */ 116 static char *b_flag = NULL; /* path to boot code */ 117 static int i_flag = 0; /* replace partition data */ 118 static int u_flag = 0; /* update partition data */ 119 static int s_flag = 0; /* Print a summary and exit */ 120 static int t_flag = 0; /* test only */ 121 static char *f_flag = NULL; /* Read config info from file */ 122 static int v_flag = 0; /* Be verbose */ 123 124 static struct part_type 125 { 126 unsigned char type; 127 const char *name; 128 } part_types[] = { 129 {0x00, "unused"} 130 ,{0x01, "Primary DOS with 12 bit FAT"} 131 ,{0x02, "XENIX / file system"} 132 ,{0x03, "XENIX /usr file system"} 133 ,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"} 134 ,{0x05, "Extended DOS"} 135 ,{0x06, "Primary 'big' DOS (>= 32MB)"} 136 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"} 137 ,{0x08, "AIX file system or SplitDrive"} 138 ,{0x09, "AIX boot partition or Coherent"} 139 ,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"} 140 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"} 141 ,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"} 142 ,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"} 143 ,{0x0F, "Extended DOS (LBA)"} 144 ,{0x10, "OPUS"} 145 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"} 146 ,{0x12, "Compaq diagnostics"} 147 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"} 148 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"} 149 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"} 150 ,{0x18, "AST Windows swapfile"} 151 ,{0x24, "NEC DOS"} 152 ,{0x3C, "PartitionMagic recovery"} 153 ,{0x39, "plan9"} 154 ,{0x40, "VENIX 286"} 155 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"} 156 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"} 157 ,{0x43, "Linux native (sharing disk with DRDOS)"} 158 ,{0x4D, "QNX 4.2 Primary"} 159 ,{0x4E, "QNX 4.2 Secondary"} 160 ,{0x4F, "QNX 4.2 Tertiary"} 161 ,{0x50, "DM (disk manager)"} 162 ,{0x51, "DM6 Aux1 (or Novell)"} 163 ,{0x52, "CP/M or Microport SysV/AT"} 164 ,{0x53, "DM6 Aux3"} 165 ,{0x54, "DM6"} 166 ,{0x55, "EZ-Drive (disk manager)"} 167 ,{0x56, "Golden Bow (disk manager)"} 168 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */ 169 ,{0x61, "SpeedStor"} 170 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"} 171 ,{0x64, "Novell Netware/286 2.xx"} 172 ,{0x65, "Novell Netware/386 3.xx"} 173 ,{0x70, "DiskSecure Multi-Boot"} 174 ,{0x75, "PCIX"} 175 ,{0x77, "QNX4.x"} 176 ,{0x78, "QNX4.x 2nd part"} 177 ,{0x79, "QNX4.x 3rd part"} 178 ,{0x80, "Minix until 1.4a"} 179 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"} 180 ,{0x82, "Linux swap or Solaris x86"} 181 ,{0x83, "Linux native"} 182 ,{0x84, "OS/2 hidden C: drive"} 183 ,{0x85, "Linux extended"} 184 ,{0x86, "NTFS volume set??"} 185 ,{0x87, "NTFS volume set??"} 186 ,{0x93, "Amoeba file system"} 187 ,{0x94, "Amoeba bad block table"} 188 ,{0x9F, "BSD/OS"} 189 ,{0xA0, "Suspend to Disk"} 190 ,{0xA5, "FreeBSD/NetBSD/386BSD"} 191 ,{0xA6, "OpenBSD"} 192 ,{0xA7, "NeXTSTEP"} 193 ,{0xA9, "NetBSD"} 194 ,{0xAC, "IBM JFS"} 195 ,{0xB7, "BSDI BSD/386 file system"} 196 ,{0xB8, "BSDI BSD/386 swap"} 197 ,{0xBE, "Solaris x86 boot"} 198 ,{0xBF, "Solaris x86 (new)"} 199 ,{0xC1, "DRDOS/sec with 12-bit FAT"} 200 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"} 201 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"} 202 ,{0xC7, "Syrinx"} 203 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"} 204 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"} 205 ,{0xE3, "DOS R/O or SpeedStor"} 206 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."} 207 ,{0xEB, "BeOS file system"} 208 ,{0xEE, "EFI GPT"} 209 ,{0xEF, "EFI System Partition"} 210 ,{0xF1, "SpeedStor"} 211 ,{0xF2, "DOS 3.3+ Secondary"} 212 ,{0xF4, "SpeedStor large partition"} 213 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"} 214 ,{0xFF, "Xenix bad blocks table"} 215 }; 216 217 static void print_s0(int which); 218 static void print_part(int i); 219 static void init_sector0(unsigned long start); 220 static void init_boot(void); 221 static void change_part(int i); 222 static void print_params(void); 223 static void change_active(int which); 224 static void change_code(void); 225 static void get_params_to_use(void); 226 static char *get_rootdisk(void); 227 static void dos(struct dos_partition *partp); 228 static int open_disk(int flag); 229 static ssize_t read_disk(off_t sector, void *buf); 230 static int write_disk(off_t sector, void *buf); 231 static int get_params(void); 232 static int read_s0(void); 233 static int write_s0(void); 234 static int ok(const char *str); 235 static int decimal(const char *str, int *num, int deflt); 236 static const char *get_type(int type); 237 static int read_config(char *config_file); 238 static void reset_boot(void); 239 static int sanitize_partition(struct dos_partition *); 240 static void usage(void); 241 242 int 243 main(int argc, char *argv[]) 244 { 245 struct stat sb; 246 int c, i; 247 int partition = -1; 248 struct dos_partition *partp; 249 250 while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1) 251 switch (c) { 252 case 'B': 253 B_flag = 1; 254 break; 255 case 'I': 256 I_flag = 1; 257 break; 258 case 'a': 259 a_flag = 1; 260 break; 261 case 'b': 262 b_flag = optarg; 263 break; 264 case 'f': 265 f_flag = optarg; 266 break; 267 case 'i': 268 i_flag = 1; 269 break; 270 case 's': 271 s_flag = 1; 272 break; 273 case 't': 274 t_flag = 1; 275 break; 276 case 'u': 277 u_flag = 1; 278 break; 279 case 'v': 280 v_flag = 1; 281 break; 282 case '1': 283 case '2': 284 case '3': 285 case '4': 286 partition = c - '0'; 287 break; 288 default: 289 usage(); 290 } 291 if (f_flag || i_flag) 292 u_flag = 1; 293 if (t_flag) 294 v_flag = 1; 295 argc -= optind; 296 argv += optind; 297 298 if (argc == 0) { 299 disk = get_rootdisk(); 300 } else { 301 if (stat(argv[0], &sb) == 0) { 302 /* OK, full pathname given */ 303 disk = argv[0]; 304 } else if (errno == ENOENT && argv[0][0] != '/') { 305 /* Try prepending "/dev" */ 306 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]); 307 if (disk == NULL) 308 errx(1, "out of memory"); 309 } else { 310 /* other stat error, let it fail below */ 311 disk = argv[0]; 312 } 313 } 314 if (open_disk(u_flag) < 0) 315 err(1, "cannot open disk %s", disk); 316 317 /* (abu)use mboot.bootinst to probe for the sector size */ 318 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 319 err(1, "cannot allocate buffer to determine disk sector size"); 320 read_disk(0, mboot.bootinst); 321 free(mboot.bootinst); 322 mboot.bootinst = NULL; 323 324 if (s_flag) { 325 if (read_s0()) 326 err(1, "read_s0"); 327 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 328 dos_sectors); 329 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 330 for (i = 0; i < NDOSPART; i++) { 331 partp = ((struct dos_partition *) &mboot.parts) + i; 332 if (partp->dp_start == 0 && partp->dp_size == 0) 333 continue; 334 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 335 (u_long) partp->dp_start, 336 (u_long) partp->dp_size, partp->dp_typ, 337 partp->dp_flag); 338 } 339 exit(0); 340 } 341 342 printf("******* Working on device %s *******\n",disk); 343 344 if (I_flag) { 345 read_s0(); 346 reset_boot(); 347 partp = (struct dos_partition *) (&mboot.parts[0]); 348 partp->dp_typ = DOSPTYP_386BSD; 349 partp->dp_flag = ACTIVE; 350 partp->dp_start = dos_sectors; 351 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 352 dos_sectors; 353 dos(partp); 354 if (v_flag) 355 print_s0(-1); 356 if (!t_flag) 357 write_s0(); 358 exit(0); 359 } 360 if (f_flag) { 361 if (read_s0() || i_flag) 362 reset_boot(); 363 if (!read_config(f_flag)) 364 exit(1); 365 if (v_flag) 366 print_s0(-1); 367 if (!t_flag) 368 write_s0(); 369 } else { 370 if(u_flag) 371 get_params_to_use(); 372 else 373 print_params(); 374 375 if (read_s0()) 376 init_sector0(dos_sectors); 377 378 printf("Media sector size is %d\n", secsize); 379 printf("Warning: BIOS sector numbering starts with sector 1\n"); 380 printf("Information from DOS bootblock is:\n"); 381 if (partition == -1) 382 for (i = 1; i <= NDOSPART; i++) 383 change_part(i); 384 else 385 change_part(partition); 386 387 if (u_flag || a_flag) 388 change_active(partition); 389 390 if (B_flag) 391 change_code(); 392 393 if (u_flag || a_flag || B_flag) { 394 if (!t_flag) { 395 printf("\nWe haven't changed the partition table yet. "); 396 printf("This is your last chance.\n"); 397 } 398 print_s0(-1); 399 if (!t_flag) { 400 if (ok("Should we write new partition table?")) 401 write_s0(); 402 } else { 403 printf("\n-t flag specified -- partition table not written.\n"); 404 } 405 } 406 } 407 408 exit(0); 409 } 410 411 static void 412 usage() 413 { 414 fprintf(stderr, "%s%s", 415 "usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n", 416 " fdisk -f configfile [-itv] [disk]\n"); 417 exit(1); 418 } 419 420 static void 421 print_s0(int which) 422 { 423 int i; 424 425 print_params(); 426 printf("Information from DOS bootblock is:\n"); 427 if (which == -1) 428 for (i = 1; i <= NDOSPART; i++) 429 printf("%d: ", i), print_part(i); 430 else 431 print_part(which); 432 } 433 434 static struct dos_partition mtpart; 435 436 static void 437 print_part(int i) 438 { 439 struct dos_partition *partp; 440 u_int64_t part_mb; 441 442 partp = ((struct dos_partition *) &mboot.parts) + i - 1; 443 444 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 445 printf("<UNUSED>\n"); 446 return; 447 } 448 /* 449 * Be careful not to overflow. 450 */ 451 part_mb = partp->dp_size; 452 part_mb *= secsize; 453 part_mb /= (1024 * 1024); 454 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 455 get_type(partp->dp_typ)); 456 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 457 (u_long)partp->dp_start, 458 (u_long)partp->dp_size, 459 (uintmax_t)part_mb, 460 partp->dp_flag, 461 partp->dp_flag == ACTIVE ? " (active)" : ""); 462 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 463 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 464 ,partp->dp_shd 465 ,DPSECT(partp->dp_ssect) 466 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 467 ,partp->dp_ehd 468 ,DPSECT(partp->dp_esect)); 469 } 470 471 472 static void 473 init_boot(void) 474 { 475 #ifndef __ia64__ 476 const char *fname; 477 int fdesc, n; 478 struct stat sb; 479 480 fname = b_flag ? b_flag : "/boot/mbr"; 481 if ((fdesc = open(fname, O_RDONLY)) == -1 || 482 fstat(fdesc, &sb) == -1) 483 err(1, "%s", fname); 484 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 485 errx(1, "%s: length must be a multiple of sector size", fname); 486 if (mboot.bootinst != NULL) 487 free(mboot.bootinst); 488 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 489 errx(1, "%s: unable to allocate read buffer", fname); 490 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 491 close(fdesc)) 492 err(1, "%s", fname); 493 if (n != mboot.bootinst_size) 494 errx(1, "%s: short read", fname); 495 #else 496 if (mboot.bootinst != NULL) 497 free(mboot.bootinst); 498 mboot.bootinst_size = secsize; 499 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 500 errx(1, "unable to allocate boot block buffer"); 501 memset(mboot.bootinst, 0, mboot.bootinst_size); 502 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 503 #endif 504 } 505 506 507 static void 508 init_sector0(unsigned long start) 509 { 510 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]); 511 512 init_boot(); 513 514 partp->dp_typ = DOSPTYP_386BSD; 515 partp->dp_flag = ACTIVE; 516 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 517 if(start == 0) 518 start = dos_sectors; 519 partp->dp_start = start; 520 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 521 522 dos(partp); 523 } 524 525 static void 526 change_part(int i) 527 { 528 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1; 529 530 printf("The data for partition %d is:\n", i); 531 print_part(i); 532 533 if (u_flag && ok("Do you want to change it?")) { 534 int tmp; 535 536 if (i_flag) { 537 bzero((char *)partp, sizeof (struct dos_partition)); 538 if (i == 1) { 539 init_sector0(1); 540 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 541 print_part(i); 542 } 543 } 544 545 do { 546 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp); 547 Decimal("start", partp->dp_start, tmp); 548 Decimal("size", partp->dp_size, tmp); 549 if (!sanitize_partition(partp)) { 550 warnx("ERROR: failed to adjust; setting sysid to 0"); 551 partp->dp_typ = 0; 552 } 553 554 if (ok("Explicitly specify beg/end address ?")) 555 { 556 int tsec,tcyl,thd; 557 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 558 thd = partp->dp_shd; 559 tsec = DPSECT(partp->dp_ssect); 560 Decimal("beginning cylinder", tcyl, tmp); 561 Decimal("beginning head", thd, tmp); 562 Decimal("beginning sector", tsec, tmp); 563 partp->dp_scyl = DOSCYL(tcyl); 564 partp->dp_ssect = DOSSECT(tsec,tcyl); 565 partp->dp_shd = thd; 566 567 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 568 thd = partp->dp_ehd; 569 tsec = DPSECT(partp->dp_esect); 570 Decimal("ending cylinder", tcyl, tmp); 571 Decimal("ending head", thd, tmp); 572 Decimal("ending sector", tsec, tmp); 573 partp->dp_ecyl = DOSCYL(tcyl); 574 partp->dp_esect = DOSSECT(tsec,tcyl); 575 partp->dp_ehd = thd; 576 } else 577 dos(partp); 578 579 print_part(i); 580 } while (!ok("Are we happy with this entry?")); 581 } 582 } 583 584 static void 585 print_params() 586 { 587 printf("parameters extracted from in-core disklabel are:\n"); 588 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 589 ,cyls,heads,sectors,cylsecs); 590 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 591 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 592 printf("parameters to be used for BIOS calculations are:\n"); 593 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 594 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 595 } 596 597 static void 598 change_active(int which) 599 { 600 struct dos_partition *partp = &mboot.parts[0]; 601 int active, i, new, tmp; 602 603 active = -1; 604 for (i = 0; i < NDOSPART; i++) { 605 if ((partp[i].dp_flag & ACTIVE) == 0) 606 continue; 607 printf("Partition %d is marked active\n", i + 1); 608 if (active == -1) 609 active = i + 1; 610 } 611 if (a_flag && which != -1) 612 active = which; 613 else if (active == -1) 614 active = 1; 615 616 if (!ok("Do you want to change the active partition?")) 617 return; 618 setactive: 619 do { 620 new = active; 621 Decimal("active partition", new, tmp); 622 if (new < 1 || new > 4) { 623 printf("Active partition number must be in range 1-4." 624 " Try again.\n"); 625 goto setactive; 626 } 627 active = new; 628 } while (!ok("Are you happy with this choice")); 629 for (i = 0; i < NDOSPART; i++) 630 partp[i].dp_flag = 0; 631 if (active > 0 && active <= NDOSPART) 632 partp[active-1].dp_flag = ACTIVE; 633 } 634 635 static void 636 change_code() 637 { 638 if (ok("Do you want to change the boot code?")) 639 init_boot(); 640 } 641 642 void 643 get_params_to_use() 644 { 645 int tmp; 646 print_params(); 647 if (ok("Do you want to change our idea of what BIOS thinks ?")) 648 { 649 do 650 { 651 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp); 652 Decimal("BIOS's idea of #heads", dos_heads, tmp); 653 Decimal("BIOS's idea of #sectors", dos_sectors, tmp); 654 dos_cylsecs = dos_heads * dos_sectors; 655 print_params(); 656 } 657 while(!ok("Are you happy with this choice")); 658 } 659 } 660 661 662 /***********************************************\ 663 * Change real numbers into strange dos numbers * 664 \***********************************************/ 665 static void 666 dos(struct dos_partition *partp) 667 { 668 int cy, sec; 669 u_int32_t end; 670 671 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 672 memcpy(partp, &mtpart, sizeof(*partp)); 673 return; 674 } 675 676 /* Start c/h/s. */ 677 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 678 cy = partp->dp_start / dos_cylsecs; 679 sec = partp->dp_start % dos_sectors + 1; 680 partp->dp_scyl = DOSCYL(cy); 681 partp->dp_ssect = DOSSECT(sec, cy); 682 683 /* End c/h/s. */ 684 end = partp->dp_start + partp->dp_size - 1; 685 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 686 cy = end / dos_cylsecs; 687 sec = end % dos_sectors + 1; 688 partp->dp_ecyl = DOSCYL(cy); 689 partp->dp_esect = DOSSECT(sec, cy); 690 } 691 692 static int 693 open_disk(int flag) 694 { 695 struct stat st; 696 int rwmode; 697 698 if (stat(disk, &st) == -1) { 699 if (errno == ENOENT) 700 return -2; 701 warnx("can't get file status of %s", disk); 702 return -1; 703 } 704 if ( !(st.st_mode & S_IFCHR) ) 705 warnx("device %s is not character special", disk); 706 rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY; 707 fd = open(disk, rwmode); 708 if (fd == -1 && errno == EPERM && rwmode == O_RDWR) 709 fd = open(disk, O_RDONLY); 710 if (fd == -1 && errno == ENXIO) 711 return -2; 712 if (fd == -1) { 713 warnx("can't open device %s", disk); 714 return -1; 715 } 716 if (get_params() == -1) { 717 warnx("can't get disk parameters on %s", disk); 718 return -1; 719 } 720 return fd; 721 } 722 723 static ssize_t 724 read_disk(off_t sector, void *buf) 725 { 726 727 lseek(fd, (sector * 512), 0); 728 if (secsize == 0) 729 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 730 secsize *= 2) { 731 /* try the read */ 732 int size = read(fd, buf, secsize); 733 if (size == secsize) 734 /* it worked so return */ 735 return secsize; 736 } 737 else 738 return read(fd, buf, secsize); 739 740 /* we failed to read at any of the sizes */ 741 return -1; 742 } 743 744 static int 745 write_disk(off_t sector, void *buf) 746 { 747 int error; 748 struct gctl_req *grq; 749 const char *q; 750 char fbuf[BUFSIZ]; 751 int i, fdw; 752 753 grq = gctl_get_handle(); 754 gctl_ro_param(grq, "verb", -1, "write MBR"); 755 gctl_ro_param(grq, "class", -1, "MBR"); 756 q = strrchr(disk, '/'); 757 if (q == NULL) 758 q = disk; 759 else 760 q++; 761 gctl_ro_param(grq, "geom", -1, q); 762 gctl_ro_param(grq, "data", secsize, buf); 763 q = gctl_issue(grq); 764 if (q == NULL) { 765 gctl_free(grq); 766 return(0); 767 } 768 warnx("%s", q); 769 gctl_free(grq); 770 771 error = pwrite(fd, buf, secsize, (sector * 512)); 772 if (error == secsize) 773 return (0); 774 775 for (i = 1; i < 5; i++) { 776 sprintf(fbuf, "%ss%d", disk, i); 777 fdw = open(fbuf, O_RDWR, 0); 778 if (fdw < 0) 779 continue; 780 error = ioctl(fdw, DIOCSMBR, buf); 781 close(fdw); 782 if (error == 0) 783 return (0); 784 } 785 warnx("Failed to write sector zero"); 786 return(EINVAL); 787 } 788 789 static int 790 get_params() 791 { 792 int error; 793 u_int u; 794 off_t o; 795 796 error = ioctl(fd, DIOCGFWSECTORS, &u); 797 if (error == 0) 798 sectors = dos_sectors = u; 799 else 800 sectors = dos_sectors = 63; 801 802 error = ioctl(fd, DIOCGFWHEADS, &u); 803 if (error == 0) 804 heads = dos_heads = u; 805 else 806 heads = dos_heads = 255; 807 808 dos_cylsecs = cylsecs = heads * sectors; 809 disksecs = cyls * heads * sectors; 810 811 error = ioctl(fd, DIOCGSECTORSIZE, &u); 812 if (error != 0 || u == 0) 813 u = 512; 814 815 error = ioctl(fd, DIOCGMEDIASIZE, &o); 816 if (error == 0) { 817 disksecs = o / u; 818 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 819 } 820 821 return (disksecs); 822 } 823 824 825 static int 826 read_s0() 827 { 828 int i; 829 830 mboot.bootinst_size = secsize; 831 if (mboot.bootinst != NULL) 832 free(mboot.bootinst); 833 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 834 warnx("unable to allocate buffer to read fdisk " 835 "partition table"); 836 return -1; 837 } 838 if (read_disk(0, mboot.bootinst) == -1) { 839 warnx("can't read fdisk partition table"); 840 return -1; 841 } 842 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 843 warnx("invalid fdisk partition table found"); 844 /* So should we initialize things */ 845 return -1; 846 } 847 for (i = 0; i < NDOSPART; i++) 848 dos_partition_dec( 849 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 850 &mboot.parts[i]); 851 return 0; 852 } 853 854 static int 855 write_s0() 856 { 857 int sector, i; 858 859 if (iotest) { 860 print_s0(-1); 861 return 0; 862 } 863 for(i = 0; i < NDOSPART; i++) 864 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 865 &mboot.parts[i]); 866 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 867 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 868 if (write_disk(sector, 869 &mboot.bootinst[sector * secsize]) == -1) { 870 warn("can't write fdisk partition table"); 871 return -1; 872 } 873 return(0); 874 } 875 876 877 static int 878 ok(const char *str) 879 { 880 printf("%s [n] ", str); 881 fflush(stdout); 882 if (fgets(lbuf, LBUF, stdin) == NULL) 883 exit(1); 884 lbuf[strlen(lbuf)-1] = 0; 885 886 if (*lbuf && 887 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 888 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 889 return 1; 890 else 891 return 0; 892 } 893 894 static int 895 decimal(const char *str, int *num, int deflt) 896 { 897 int acc = 0, c; 898 char *cp; 899 900 while (1) { 901 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 902 fflush(stdout); 903 if (fgets(lbuf, LBUF, stdin) == NULL) 904 exit(1); 905 lbuf[strlen(lbuf)-1] = 0; 906 907 if (!*lbuf) 908 return 0; 909 910 cp = lbuf; 911 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 912 if (!c) 913 return 0; 914 while ((c = *cp++)) { 915 if (c <= '9' && c >= '0') 916 acc = acc * 10 + c - '0'; 917 else 918 break; 919 } 920 if (c == ' ' || c == '\t') 921 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 922 if (!c) { 923 *num = acc; 924 return 1; 925 } else 926 printf("%s is an invalid decimal number. Try again.\n", 927 lbuf); 928 } 929 930 } 931 932 static const char * 933 get_type(int type) 934 { 935 int numentries = (sizeof(part_types)/sizeof(struct part_type)); 936 int counter = 0; 937 struct part_type *ptr = part_types; 938 939 940 while(counter < numentries) { 941 if(ptr->type == type) 942 return(ptr->name); 943 ptr++; 944 counter++; 945 } 946 return("unknown"); 947 } 948 949 950 static void 951 parse_config_line(char *line, CMD *command) 952 { 953 char *cp, *end; 954 955 cp = line; 956 while (1) { 957 memset(command, 0, sizeof(*command)); 958 959 while (isspace(*cp)) ++cp; 960 if (*cp == '\0' || *cp == '#') 961 break; 962 command->cmd = *cp++; 963 964 /* 965 * Parse args 966 */ 967 while (1) { 968 while (isspace(*cp)) ++cp; 969 if (*cp == '#') 970 break; /* found comment */ 971 if (isalpha(*cp)) 972 command->args[command->n_args].argtype = *cp++; 973 if (!isdigit(*cp)) 974 break; /* assume end of line */ 975 end = NULL; 976 command->args[command->n_args].arg_val = strtol(cp, &end, 0); 977 if (cp == end) 978 break; /* couldn't parse number */ 979 cp = end; 980 command->n_args++; 981 } 982 break; 983 } 984 } 985 986 987 static int 988 process_geometry(CMD *command) 989 { 990 int status = 1, i; 991 992 while (1) { 993 geom_processed = 1; 994 if (part_processed) { 995 warnx( 996 "ERROR line %d: the geometry specification line must occur before\n\ 997 all partition specifications", 998 current_line_number); 999 status = 0; 1000 break; 1001 } 1002 if (command->n_args != 3) { 1003 warnx("ERROR line %d: incorrect number of geometry args", 1004 current_line_number); 1005 status = 0; 1006 break; 1007 } 1008 dos_cyls = 0; 1009 dos_heads = 0; 1010 dos_sectors = 0; 1011 for (i = 0; i < 3; ++i) { 1012 switch (command->args[i].argtype) { 1013 case 'c': 1014 dos_cyls = command->args[i].arg_val; 1015 break; 1016 case 'h': 1017 dos_heads = command->args[i].arg_val; 1018 break; 1019 case 's': 1020 dos_sectors = command->args[i].arg_val; 1021 break; 1022 default: 1023 warnx( 1024 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1025 current_line_number, command->args[i].argtype, 1026 command->args[i].argtype); 1027 status = 0; 1028 break; 1029 } 1030 } 1031 if (status == 0) 1032 break; 1033 1034 dos_cylsecs = dos_heads * dos_sectors; 1035 1036 /* 1037 * Do sanity checks on parameter values 1038 */ 1039 if (dos_cyls == 0) { 1040 warnx("ERROR line %d: number of cylinders not specified", 1041 current_line_number); 1042 status = 0; 1043 } 1044 if (dos_cyls > 1024) { 1045 warnx( 1046 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1047 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1048 is dedicated to FreeBSD)", 1049 current_line_number, dos_cyls); 1050 } 1051 1052 if (dos_heads == 0) { 1053 warnx("ERROR line %d: number of heads not specified", 1054 current_line_number); 1055 status = 0; 1056 } else if (dos_heads > 256) { 1057 warnx("ERROR line %d: number of heads must be within (1-256)", 1058 current_line_number); 1059 status = 0; 1060 } 1061 1062 if (dos_sectors == 0) { 1063 warnx("ERROR line %d: number of sectors not specified", 1064 current_line_number); 1065 status = 0; 1066 } else if (dos_sectors > 63) { 1067 warnx("ERROR line %d: number of sectors must be within (1-63)", 1068 current_line_number); 1069 status = 0; 1070 } 1071 1072 break; 1073 } 1074 return (status); 1075 } 1076 1077 1078 static int 1079 process_partition(CMD *command) 1080 { 1081 int status = 0, partition; 1082 u_int32_t prev_head_boundary, prev_cyl_boundary; 1083 u_int32_t adj_size, max_end; 1084 struct dos_partition *partp; 1085 1086 while (1) { 1087 part_processed = 1; 1088 if (command->n_args != 4) { 1089 warnx("ERROR line %d: incorrect number of partition args", 1090 current_line_number); 1091 break; 1092 } 1093 partition = command->args[0].arg_val; 1094 if (partition < 1 || partition > 4) { 1095 warnx("ERROR line %d: invalid partition number %d", 1096 current_line_number, partition); 1097 break; 1098 } 1099 partp = ((struct dos_partition *) &mboot.parts) + partition - 1; 1100 bzero((char *)partp, sizeof (struct dos_partition)); 1101 partp->dp_typ = command->args[1].arg_val; 1102 partp->dp_start = command->args[2].arg_val; 1103 partp->dp_size = command->args[3].arg_val; 1104 max_end = partp->dp_start + partp->dp_size; 1105 1106 if (partp->dp_typ == 0) { 1107 /* 1108 * Get out, the partition is marked as unused. 1109 */ 1110 /* 1111 * Insure that it's unused. 1112 */ 1113 bzero((char *)partp, sizeof (struct dos_partition)); 1114 status = 1; 1115 break; 1116 } 1117 1118 /* 1119 * Adjust start upwards, if necessary, to fall on a head boundary. 1120 */ 1121 if (partp->dp_start % dos_sectors != 0) { 1122 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1123 if (max_end < dos_sectors || 1124 prev_head_boundary > max_end - dos_sectors) { 1125 /* 1126 * Can't go past end of partition 1127 */ 1128 warnx( 1129 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1130 a head boundary", 1131 current_line_number, partition); 1132 break; 1133 } 1134 warnx( 1135 "WARNING: adjusting start offset of partition %d\n\ 1136 from %u to %u, to fall on a head boundary", 1137 partition, (u_int)partp->dp_start, 1138 (u_int)(prev_head_boundary + dos_sectors)); 1139 partp->dp_start = prev_head_boundary + dos_sectors; 1140 } 1141 1142 /* 1143 * Adjust size downwards, if necessary, to fall on a cylinder 1144 * boundary. 1145 */ 1146 prev_cyl_boundary = 1147 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1148 if (prev_cyl_boundary > partp->dp_start) 1149 adj_size = prev_cyl_boundary - partp->dp_start; 1150 else { 1151 warnx( 1152 "ERROR: could not adjust partition to start on a head boundary\n\ 1153 and end on a cylinder boundary."); 1154 return (0); 1155 } 1156 if (adj_size != partp->dp_size) { 1157 warnx( 1158 "WARNING: adjusting size of partition %d from %u to %u\n\ 1159 to end on a cylinder boundary", 1160 partition, (u_int)partp->dp_size, (u_int)adj_size); 1161 partp->dp_size = adj_size; 1162 } 1163 if (partp->dp_size == 0) { 1164 warnx("ERROR line %d: size of partition %d is zero", 1165 current_line_number, partition); 1166 break; 1167 } 1168 1169 dos(partp); 1170 status = 1; 1171 break; 1172 } 1173 return (status); 1174 } 1175 1176 1177 static int 1178 process_active(CMD *command) 1179 { 1180 int status = 0, partition, i; 1181 struct dos_partition *partp; 1182 1183 while (1) { 1184 active_processed = 1; 1185 if (command->n_args != 1) { 1186 warnx("ERROR line %d: incorrect number of active args", 1187 current_line_number); 1188 status = 0; 1189 break; 1190 } 1191 partition = command->args[0].arg_val; 1192 if (partition < 1 || partition > 4) { 1193 warnx("ERROR line %d: invalid partition number %d", 1194 current_line_number, partition); 1195 break; 1196 } 1197 /* 1198 * Reset active partition 1199 */ 1200 partp = ((struct dos_partition *) &mboot.parts); 1201 for (i = 0; i < NDOSPART; i++) 1202 partp[i].dp_flag = 0; 1203 partp[partition-1].dp_flag = ACTIVE; 1204 1205 status = 1; 1206 break; 1207 } 1208 return (status); 1209 } 1210 1211 1212 static int 1213 process_line(char *line) 1214 { 1215 CMD command; 1216 int status = 1; 1217 1218 while (1) { 1219 parse_config_line(line, &command); 1220 switch (command.cmd) { 1221 case 0: 1222 /* 1223 * Comment or blank line 1224 */ 1225 break; 1226 case 'g': 1227 /* 1228 * Set geometry 1229 */ 1230 status = process_geometry(&command); 1231 break; 1232 case 'p': 1233 status = process_partition(&command); 1234 break; 1235 case 'a': 1236 status = process_active(&command); 1237 break; 1238 default: 1239 status = 0; 1240 break; 1241 } 1242 break; 1243 } 1244 return (status); 1245 } 1246 1247 1248 static int 1249 read_config(char *config_file) 1250 { 1251 FILE *fp = NULL; 1252 int status = 1; 1253 char buf[1010]; 1254 1255 while (1) { 1256 if (strcmp(config_file, "-") != 0) { 1257 /* 1258 * We're not reading from stdin 1259 */ 1260 if ((fp = fopen(config_file, "r")) == NULL) { 1261 status = 0; 1262 break; 1263 } 1264 } else { 1265 fp = stdin; 1266 } 1267 current_line_number = 0; 1268 while (!feof(fp)) { 1269 if (fgets(buf, sizeof(buf), fp) == NULL) 1270 break; 1271 ++current_line_number; 1272 status = process_line(buf); 1273 if (status == 0) 1274 break; 1275 } 1276 break; 1277 } 1278 if (fp) { 1279 /* 1280 * It doesn't matter if we're reading from stdin, as we've reached EOF 1281 */ 1282 fclose(fp); 1283 } 1284 return (status); 1285 } 1286 1287 1288 static void 1289 reset_boot(void) 1290 { 1291 int i; 1292 struct dos_partition *partp; 1293 1294 init_boot(); 1295 for (i = 0; i < 4; ++i) { 1296 partp = ((struct dos_partition *) &mboot.parts) + i; 1297 bzero((char *)partp, sizeof (struct dos_partition)); 1298 } 1299 } 1300 1301 static int 1302 sanitize_partition(struct dos_partition *partp) 1303 { 1304 u_int32_t prev_head_boundary, prev_cyl_boundary; 1305 u_int32_t max_end, size, start; 1306 1307 start = partp->dp_start; 1308 size = partp->dp_size; 1309 max_end = start + size; 1310 /* Only allow a zero size if the partition is being marked unused. */ 1311 if (size == 0) { 1312 if (start == 0 && partp->dp_typ == 0) 1313 return (1); 1314 warnx("ERROR: size of partition is zero"); 1315 return (0); 1316 } 1317 /* Return if no adjustment is necessary. */ 1318 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1319 return (1); 1320 1321 if (start == 0) { 1322 warnx("WARNING: partition overlaps with partition table"); 1323 if (ok("Correct this automatically?")) 1324 start = dos_sectors; 1325 } 1326 if (start % dos_sectors != 0) 1327 warnx("WARNING: partition does not start on a head boundary"); 1328 if ((start +size) % dos_sectors != 0) 1329 warnx("WARNING: partition does not end on a cylinder boundary"); 1330 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1331 if (!ok("Correct this automatically?")) 1332 return (1); 1333 1334 /* 1335 * Adjust start upwards, if necessary, to fall on a head boundary. 1336 */ 1337 if (start % dos_sectors != 0) { 1338 prev_head_boundary = start / dos_sectors * dos_sectors; 1339 if (max_end < dos_sectors || 1340 prev_head_boundary >= max_end - dos_sectors) { 1341 /* 1342 * Can't go past end of partition 1343 */ 1344 warnx( 1345 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1346 return (0); 1347 } 1348 start = prev_head_boundary + dos_sectors; 1349 } 1350 1351 /* 1352 * Adjust size downwards, if necessary, to fall on a cylinder 1353 * boundary. 1354 */ 1355 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1356 if (prev_cyl_boundary > start) 1357 size = prev_cyl_boundary - start; 1358 else { 1359 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1360 and end on a cylinder boundary."); 1361 return (0); 1362 } 1363 1364 /* Finally, commit any changes to partp and return. */ 1365 if (start != partp->dp_start) { 1366 warnx("WARNING: adjusting start offset of partition to %u", 1367 (u_int)start); 1368 partp->dp_start = start; 1369 } 1370 if (size != partp->dp_size) { 1371 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1372 partp->dp_size = size; 1373 } 1374 1375 return (1); 1376 } 1377 1378 /* 1379 * Try figuring out the root device's canonical disk name. 1380 * The following choices are considered: 1381 * /dev/ad0s1a => /dev/ad0 1382 * /dev/da0a => /dev/da0 1383 * /dev/vinum/root => /dev/vinum/root 1384 */ 1385 static char * 1386 get_rootdisk(void) 1387 { 1388 struct statfs rootfs; 1389 regex_t re; 1390 #define NMATCHES 2 1391 regmatch_t rm[NMATCHES]; 1392 char *s; 1393 int rv; 1394 1395 if (statfs("/", &rootfs) == -1) 1396 err(1, "statfs(\"/\")"); 1397 1398 if ((rv = regcomp(&re, "^(/dev/[a-z]+[0-9]+)([sp][0-9]+)?[a-h]?$", 1399 REG_EXTENDED)) != 0) 1400 errx(1, "regcomp() failed (%d)", rv); 1401 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0) 1402 errx(1, 1403 "mounted root fs resource doesn't match expectations (regexec returned %d)", 1404 rv); 1405 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1406 errx(1, "out of memory"); 1407 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1408 rm[1].rm_eo - rm[1].rm_so); 1409 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1410 1411 return s; 1412 } 1413