sbin/bsdlabel/bsdlabel.c

   1 /*
   2  * Copyright (c) 1994, 1995 Gordon W. Ross
   3  * Copyright (c) 1994 Theo de Raadt
   4  * All rights reserved.
   5  * Copyright (c) 1987, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Symmetric Computer Systems.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  *      This product includes software developed by Theo de Raadt.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      from: $NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk $
  41  */
  42
  43 #if 0
  44 #ifndef lint
  45 static const char copyright[] =
  46 "@(#) Copyright (c) 1987, 1993\n\
  47         The Regents of the University of California.  All rights reserved.\n";
  48 #endif /* not lint */
  49
  50 #ifndef lint
  51 static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 1/7/94";
  52 /* from static char sccsid[] = "@(#)disklabel.c 1.2 (Symmetric) 11/28/85"; */
  53 #endif /* not lint */
  54 #endif
  55 #include <sys/cdefs.h>
  56 __FBSDID("$FreeBSD$");
  57
  58 #include <sys/param.h>
  59 #include <stdint.h>
  60 #include <sys/file.h>
  61 #include <sys/stat.h>
  62 #include <sys/wait.h>
  63 #include <sys/disk.h>
  64 #define DKTYPENAMES
  65 #define FSTYPENAMES
  66 #define MAXPARTITIONS   20
  67 #include <sys/disklabel.h>
  68
  69 #include <unistd.h>
  70 #include <string.h>
  71 #include <stdio.h>
  72 #include <libgeom.h>
  73 #include <stdlib.h>
  74 #include <signal.h>
  75 #include <stdarg.h>
  76 #include <ctype.h>
  77 #include <err.h>
  78 #include <errno.h>
  79
  80 #include "pathnames.h"
  81
  82 static void     makelabel(const char *, struct disklabel *);
  83 static int      geom_class_available(const char *);
  84 static int      writelabel(void);
  85 static int      readlabel(int flag);
  86 static void     display(FILE *, const struct disklabel *);
  87 static int      edit(void);
  88 static int      editit(void);
  89 static void     fixlabel(struct disklabel *);
  90 static char     *skip(char *);
  91 static char     *word(char *);
  92 static int      getasciilabel(FILE *, struct disklabel *);
  93 static int      getasciipartspec(char *, struct disklabel *, int, int);
  94 static int      checklabel(struct disklabel *);
  95 static void     usage(void);
  96 static struct disklabel *getvirginlabel(void);
  97
  98 #define DEFEDITOR       _PATH_VI
  99 #define DEFPARTITIONS   8
 100
 101 static char     *specname;
 102 static char     *pname;
 103 static char     tmpfil[] = PATH_TMPFILE;
 104
 105 static struct   disklabel lab;
 106 static u_char   bootarea[BBSIZE];
 107 static off_t    mediasize;
 108 static ssize_t  secsize;
 109 static char     blank[] = "";
 110 static char     unknown[] = "unknown";
 111
 112 #define MAX_PART ('z')
 113 #define MAX_NUM_PARTS (1 + MAX_PART - 'a')
 114 static char    part_size_type[MAX_NUM_PARTS];
 115 static char    part_offset_type[MAX_NUM_PARTS];
 116 static int     part_set[MAX_NUM_PARTS];
 117
 118 static int      installboot;    /* non-zero if we should install a boot program */
 119 static int      allfields;      /* present all fields in edit */
 120 static char const *xxboot;      /* primary boot */
 121
 122 static uint32_t lba_offset;
 123 #ifndef LABELSECTOR
 124 #define LABELSECTOR -1
 125 #endif
 126 #ifndef LABELOFFSET
 127 #define LABELOFFSET -1
 128 #endif
 129 static int labelsoffset = LABELSECTOR;
 130 static int labeloffset = LABELOFFSET;
 131 static int bbsize = BBSIZE;
 132
 133 static enum {
 134         UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
 135 } op = UNSPEC;
 136
 137
 138 static int      disable_write;   /* set to disable writing to disk label */
 139 static int      is_file;        /* work on a file (abs. pathname), "-f" opt. */
 140
 141 int
 142 main(int argc, char *argv[])
 143 {
 144         FILE *t;
 145         int ch, error, fd;
 146         const char *name;
 147
 148         error = 0;
 149         name = NULL;
 150
 151         while ((ch = getopt(argc, argv, "ABb:efm:nRrw")) != -1)
 152                 switch (ch) {
 153                         case 'A':
 154                                 allfields = 1;
 155                                 break;
 156                         case 'B':
 157                                 ++installboot;
 158                                 break;
 159                         case 'b':
 160                                 xxboot = optarg;
 161                                 break;
 162                         case 'f':
 163                                 is_file=1;
 164                                 break;
 165                         case 'm':
 166                                 if (!strcmp(optarg, "i386") ||
 167                                     !strcmp(optarg, "amd64") ||
 168                                     !strcmp(optarg, "pc98")) {
 169                                         labelsoffset = 1;
 170                                         labeloffset = 0;
 171                                         bbsize = 8192;
 172                                 } else {
 173                                         errx(1, "Unsupported architecture");
 174                                 }
 175                                 break;
 176                         case 'n':
 177                                 disable_write = 1;
 178                                 break;
 179                         case 'R':
 180                                 if (op != UNSPEC)
 181                                         usage();
 182                                 op = RESTORE;
 183                                 break;
 184                         case 'e':
 185                                 if (op != UNSPEC)
 186                                         usage();
 187                                 op = EDIT;
 188                                 break;
 189                         case 'r':
 190                                 /*
 191                                  * We accept and ignore -r for compatibility with
 192                                  * historical disklabel usage.
 193                                  */
 194                                 break;
 195                         case 'w':
 196                                 if (op != UNSPEC)
 197                                         usage();
 198                                 op = WRITE;
 199                                 break;
 200                         case '?':
 201                         default:
 202                                 usage();
 203                 }
 204         argc -= optind;
 205         argv += optind;
 206
 207         if (argc < 1)
 208                 usage();
 209         if (labelsoffset < 0 || labeloffset < 0)
 210                 errx(1, "a -m <architecture> option must be specified");
 211
 212         /* Figure out the names of the thing we're working on */
 213         if (is_file) {
 214                 specname = argv[0];
 215         } else {
 216                 specname = g_device_path(argv[0]);
 217                 if (specname == NULL) {
 218                         warn("unable to get correct path for %s", argv[0]);
 219                         return(1);
 220                 }
 221                 fd = open(specname, O_RDONLY);
 222                 if (fd < 0) {
 223                         warn("error opening %s", specname);
 224                         return(1);
 225                 }
 226                 pname = g_providername(fd);
 227                 if (pname == NULL) {
 228                         warn("error getting providername for %s", specname);
 229                         close(fd);
 230                         return(1);
 231                 }
 232                 close(fd);
 233         }
 234
 235         if (installboot && op == UNSPEC)
 236                 op = WRITEBOOT;
 237         else if (op == UNSPEC)
 238                 op = READ;
 239
 240         switch(op) {
 241
 242         case UNSPEC:
 243                 break;
 244
 245         case EDIT:
 246                 if (argc != 1)
 247                         usage();
 248                 readlabel(1);
 249                 fixlabel(&lab);
 250                 error = edit();
 251                 break;
 252
 253         case READ:
 254                 if (argc != 1)
 255                         usage();
 256                 readlabel(1);
 257                 display(stdout, NULL);
 258                 error = checklabel(NULL);
 259                 break;
 260
 261         case RESTORE:
 262                 if (argc != 2)
 263                         usage();
 264                 if (!(t = fopen(argv[1], "r")))
 265                         err(4, "fopen %s", argv[1]);
 266                 readlabel(0);
 267                 if (!getasciilabel(t, &lab))
 268                         exit(1);
 269                 error = writelabel();
 270                 break;
 271
 272         case WRITE:
 273                 if (argc == 2)
 274                         name = argv[1];
 275                 else if (argc == 1)
 276                         name = "auto";
 277                 else
 278                         usage();
 279                 readlabel(0);
 280                 makelabel(name, &lab);
 281                 fixlabel(&lab);
 282                 if (checklabel(NULL) == 0)
 283                         error = writelabel();
 284                 break;
 285
 286         case WRITEBOOT:
 287
 288                 readlabel(1);
 289                 fixlabel(&lab);
 290                 if (argc == 2)
 291                         makelabel(argv[1], &lab);
 292                 if (checklabel(NULL) == 0)
 293                         error = writelabel();
 294                 break;
 295         }
 296         exit(error);
 297 }
 298
 299 static void
 300 fixlabel(struct disklabel *lp)
 301 {
 302         struct partition *dp;
 303         int i;
 304
 305         for (i = 0; i < lp->d_npartitions; i++) {
 306                 if (i == RAW_PART)
 307                         continue;
 308                 if (lp->d_partitions[i].p_size)
 309                         return;
 310         }
 311
 312         dp = &lp->d_partitions[0];
 313         dp->p_offset = BBSIZE / secsize;
 314         dp->p_size = lp->d_secperunit - dp->p_offset;
 315 }
 316
 317 /*
 318  * Construct a prototype disklabel from /etc/disktab.
 319  */
 320 static void
 321 makelabel(const char *type, struct disklabel *lp)
 322 {
 323         struct disklabel *dp;
 324
 325         if (strcmp(type, "auto") == 0)
 326                 dp = getvirginlabel();
 327         else
 328                 dp = getdiskbyname(type);
 329         if (dp == NULL)
 330                 errx(1, "%s: unknown disk type", type);
 331         *lp = *dp;
 332         bzero(lp->d_packname, sizeof(lp->d_packname));
 333 }
 334
 335 static void
 336 readboot(void)
 337 {
 338         int fd;
 339         struct stat st;
 340
 341         if (xxboot == NULL)
 342                 xxboot = "/boot/boot";
 343         fd = open(xxboot, O_RDONLY);
 344         if (fd < 0)
 345                 err(1, "cannot open %s", xxboot);
 346         fstat(fd, &st);
 347         if (st.st_size <= BBSIZE) {
 348                 if (read(fd, bootarea, st.st_size) != st.st_size)
 349                         err(1, "read error %s", xxboot);
 350                 close(fd);
 351                 return;
 352         }
 353         errx(1, "boot code %s is wrong size", xxboot);
 354 }
 355
 356 static int
 357 geom_class_available(const char *name)
 358 {
 359         struct gclass *class;
 360         struct gmesh mesh;
 361         int error;
 362
 363         error = geom_gettree(&mesh);
 364         if (error != 0)
 365                 errc(1, error, "Cannot get GEOM tree");
 366
 367         LIST_FOREACH(class, &mesh.lg_class, lg_class) {
 368                 if (strcmp(class->lg_name, name) == 0) {
 369                         geom_deletetree(&mesh);
 370                         return (1);
 371                 }
 372         }
 373
 374         geom_deletetree(&mesh);
 375
 376         return (0);
 377 }
 378
 379 static int
 380 writelabel(void)
 381 {
 382         int i, fd, serrno;
 383         struct gctl_req *grq;
 384         char const *errstr;
 385         struct disklabel *lp = &lab;
 386
 387         if (disable_write) {
 388                 warnx("write to disk label suppressed - label was as follows:");
 389                 display(stdout, NULL);
 390                 return (0);
 391         }
 392
 393         lp->d_magic = DISKMAGIC;
 394         lp->d_magic2 = DISKMAGIC;
 395         lp->d_checksum = 0;
 396         lp->d_checksum = dkcksum(lp);
 397         if (installboot)
 398                 readboot();
 399         for (i = 0; i < lab.d_npartitions; i++)
 400                 if (lab.d_partitions[i].p_size)
 401                         lab.d_partitions[i].p_offset += lba_offset;
 402         bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * lab.d_secsize,
 403             lp);
 404
 405         fd = open(specname, O_RDWR);
 406         if (fd < 0) {
 407                 if (is_file) {
 408                         warn("cannot open file %s for writing label", specname);
 409                         return(1);
 410                 } else
 411                         serrno = errno;
 412
 413                 if (geom_class_available("PART") != 0) {
 414                         /*
 415                          * Since we weren't able open provider for
 416                          * writing, then recommend user to use gpart(8).
 417                          */
 418                         warnc(serrno,
 419                             "cannot open provider %s for writing label",
 420                             specname);
 421                         warnx("Try to use gpart(8).");
 422                         return (1);
 423                 }
 424
 425                 /* Give up if GEOM_BSD is not available. */
 426                 if (geom_class_available("BSD") == 0) {
 427                         warnc(serrno, "%s", specname);
 428                         return (1);
 429                 }
 430
 431                 grq = gctl_get_handle();
 432                 gctl_ro_param(grq, "verb", -1, "write label");
 433                 gctl_ro_param(grq, "class", -1, "BSD");
 434                 gctl_ro_param(grq, "geom", -1, pname);
 435                 gctl_ro_param(grq, "label", 148+16*8,
 436                         bootarea + labeloffset + labelsoffset * lab.d_secsize);
 437                 errstr = gctl_issue(grq);
 438                 if (errstr != NULL) {
 439                         warnx("%s", errstr);
 440                         gctl_free(grq);
 441                         return(1);
 442                 }
 443                 gctl_free(grq);
 444                 if (installboot) {
 445                         grq = gctl_get_handle();
 446                         gctl_ro_param(grq, "verb", -1, "write bootcode");
 447                         gctl_ro_param(grq, "class", -1, "BSD");
 448                         gctl_ro_param(grq, "geom", -1, pname);
 449                         gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
 450                         errstr = gctl_issue(grq);
 451                         if (errstr != NULL) {
 452                                 warnx("%s", errstr);
 453                                 gctl_free(grq);
 454                                 return (1);
 455                         }
 456                         gctl_free(grq);
 457                 }
 458         } else {
 459                 if (write(fd, bootarea, bbsize) != bbsize) {
 460                         warn("write %s", specname);
 461                         close (fd);
 462                         return (1);
 463                 }
 464                 close (fd);
 465         }
 466         return (0);
 467 }
 468
 469 static void
 470 get_file_parms(int f)
 471 {
 472         int i;
 473         struct stat sb;
 474
 475         if (fstat(f, &sb) != 0)
 476                 err(4, "fstat failed");
 477         i = sb.st_mode & S_IFMT;
 478         if (i != S_IFREG && i != S_IFLNK)
 479                 errx(4, "%s is not a valid file or link", specname);
 480         secsize = DEV_BSIZE;
 481         mediasize = sb.st_size;
 482 }
 483
 484 /*
 485  * Fetch disklabel for disk.
 486  */
 487 static int
 488 readlabel(int flag)
 489 {
 490         ssize_t nbytes;
 491         uint32_t lba;
 492         int f, i;
 493         int error;
 494
 495         f = open(specname, O_RDONLY);
 496         if (f < 0)
 497                 err(1, "%s", specname);
 498         if (is_file)
 499                 get_file_parms(f);
 500         else {
 501                 mediasize = g_mediasize(f);
 502                 secsize = g_sectorsize(f);
 503                 if (secsize < 0 || mediasize < 0)
 504                         err(4, "cannot get disk geometry");
 505         }
 506         if (mediasize > (off_t)0xffffffff * secsize)
 507                 errx(1,
 508                     "disks with more than 2^32-1 sectors are not supported");
 509         (void)lseek(f, (off_t)0, SEEK_SET);
 510         nbytes = read(f, bootarea, BBSIZE);
 511         if (nbytes == -1)
 512                 err(4, "%s read", specname);
 513         if (nbytes != BBSIZE)
 514                 errx(4, "couldn't read %d bytes from %s", BBSIZE, specname);
 515         close (f);
 516         error = bsd_disklabel_le_dec(
 517             bootarea + (labeloffset + labelsoffset * secsize),
 518             &lab, MAXPARTITIONS);
 519         if (flag && error)
 520                 errx(1, "%s: no valid label found", specname);
 521
 522         if (is_file)
 523                 return(0);
 524
 525         /*
 526          * Compensate for absolute block addressing by finding the
 527          * smallest partition offset and if the offset of the 'c'
 528          * partition is equal to that, subtract it from all offsets.
 529          */
 530         lba = ~0;
 531         for (i = 0; i < lab.d_npartitions; i++) {
 532                 if (lab.d_partitions[i].p_size)
 533                         lba = MIN(lba, lab.d_partitions[i].p_offset);
 534         }
 535         if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
 536                 for (i = 0; i < lab.d_npartitions; i++) {
 537                         if (lab.d_partitions[i].p_size)
 538                                 lab.d_partitions[i].p_offset -= lba;
 539                 }
 540                 /*
 541                  * Save the offset so that we can write the label
 542                  * back with absolute block addresses.
 543                  */
 544                 lba_offset = lba;
 545         }
 546         return (error);
 547 }
 548
 549
 550 static void
 551 display(FILE *f, const struct disklabel *lp)
 552 {
 553         int i, j;
 554         const struct partition *pp;
 555
 556         if (lp == NULL)
 557                 lp = &lab;
 558
 559         fprintf(f, "# %s:\n", specname);
 560         if (allfields) {
 561                 if (lp->d_type < DKMAXTYPES)
 562                         fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
 563                 else
 564                         fprintf(f, "type: %u\n", lp->d_type);
 565                 fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
 566                         lp->d_typename);
 567                 fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
 568                         lp->d_packname);
 569                 fprintf(f, "flags:");
 570                 if (lp->d_flags & D_REMOVABLE)
 571                         fprintf(f, " removeable");
 572                 if (lp->d_flags & D_ECC)
 573                         fprintf(f, " ecc");
 574                 if (lp->d_flags & D_BADSECT)
 575                         fprintf(f, " badsect");
 576                 fprintf(f, "\n");
 577                 fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
 578                 fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
 579                 fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
 580                 fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
 581                 fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
 582                 fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
 583                 fprintf(f, "rpm: %u\n", lp->d_rpm);
 584                 fprintf(f, "interleave: %u\n", lp->d_interleave);
 585                 fprintf(f, "trackskew: %u\n", lp->d_trackskew);
 586                 fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
 587                 fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
 588                     (u_long)lp->d_headswitch);
 589                 fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
 590                     (u_long)lp->d_trkseek);
 591                 fprintf(f, "drivedata: ");
 592                 for (i = NDDATA - 1; i >= 0; i--)
 593                         if (lp->d_drivedata[i])
 594                                 break;
 595                 if (i < 0)
 596                         i = 0;
 597                 for (j = 0; j <= i; j++)
 598                         fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
 599                 fprintf(f, "\n\n");
 600         }
 601         fprintf(f, "%u partitions:\n", lp->d_npartitions);
 602         fprintf(f,
 603             "#          size     offset    fstype   [fsize bsize bps/cpg]\n");
 604         pp = lp->d_partitions;
 605         for (i = 0; i < lp->d_npartitions; i++, pp++) {
 606                 if (pp->p_size) {
 607                         fprintf(f, "  %c: %10lu %10lu  ", 'a' + i,
 608                            (u_long)pp->p_size, (u_long)pp->p_offset);
 609                         if (pp->p_fstype < FSMAXTYPES)
 610                                 fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
 611                         else
 612                                 fprintf(f, "%8d", pp->p_fstype);
 613                         switch (pp->p_fstype) {
 614
 615                         case FS_UNUSED:                         /* XXX */
 616                                 fprintf(f, "    %5lu %5lu %2s",
 617                                     (u_long)pp->p_fsize,
 618                                     (u_long)(pp->p_fsize * pp->p_frag), "");
 619                                 break;
 620
 621                         case FS_BSDFFS:
 622                                 fprintf(f, "    %5lu %5lu %5u",
 623                                     (u_long)pp->p_fsize,
 624                                     (u_long)(pp->p_fsize * pp->p_frag),
 625                                     pp->p_cpg);
 626                                 break;
 627
 628                         case FS_BSDLFS:
 629                                 fprintf(f, "    %5lu %5lu %5d",
 630                                     (u_long)pp->p_fsize,
 631                                     (u_long)(pp->p_fsize * pp->p_frag),
 632                                     pp->p_cpg);
 633                                 break;
 634
 635                         default:
 636                                 fprintf(f, "%20.20s", "");
 637                                 break;
 638                         }
 639                         if (i == RAW_PART) {
 640                                 fprintf(f, "  # \"raw\" part, don't edit");
 641                         }
 642                         fprintf(f, "\n");
 643                 }
 644         }
 645         fflush(f);
 646 }
 647
 648 static int
 649 edit(void)
 650 {
 651         int c, fd;
 652         struct disklabel label;
 653         FILE *fp;
 654
 655         if ((fd = mkstemp(tmpfil)) == -1 ||
 656             (fp = fdopen(fd, "w")) == NULL) {
 657                 warnx("can't create %s", tmpfil);
 658                 return (1);
 659         }
 660         display(fp, NULL);
 661         fclose(fp);
 662         for (;;) {
 663                 if (!editit())
 664                         break;
 665                 fp = fopen(tmpfil, "r");
 666                 if (fp == NULL) {
 667                         warnx("can't reopen %s for reading", tmpfil);
 668                         break;
 669                 }
 670                 bzero((char *)&label, sizeof(label));
 671                 c = getasciilabel(fp, &label);
 672                 fclose(fp);
 673                 if (c) {
 674                         lab = label;
 675                         if (writelabel() == 0) {
 676                                 (void) unlink(tmpfil);
 677                                 return (0);
 678                         }
 679                 }
 680                 printf("re-edit the label? [y]: ");
 681                 fflush(stdout);
 682                 c = getchar();
 683                 if (c != EOF && c != (int)'\n')
 684                         while (getchar() != (int)'\n')
 685                                 ;
 686                 if  (c == (int)'n')
 687                         break;
 688         }
 689         (void) unlink(tmpfil);
 690         return (1);
 691 }
 692
 693 static int
 694 editit(void)
 695 {
 696         int pid, xpid;
 697         int locstat, omask;
 698         const char *ed;
 699         uid_t uid;
 700         gid_t gid;
 701
 702         omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 703         while ((pid = fork()) < 0) {
 704                 if (errno == EPROCLIM) {
 705                         warnx("you have too many processes");
 706                         return(0);
 707                 }
 708                 if (errno != EAGAIN) {
 709                         warn("fork");
 710                         return(0);
 711                 }
 712                 sleep(1);
 713         }
 714         if (pid == 0) {
 715                 sigsetmask(omask);
 716                 gid = getgid();
 717                 if (setresgid(gid, gid, gid) == -1)
 718                         err(1, "setresgid");
 719                 uid = getuid();
 720                 if (setresuid(uid, uid, uid) == -1)
 721                         err(1, "setresuid");
 722                 if ((ed = getenv("EDITOR")) == (char *)0)
 723                         ed = DEFEDITOR;
 724                 execlp(ed, ed, tmpfil, (char *)0);
 725                 err(1, "%s", ed);
 726         }
 727         while ((xpid = wait(&locstat)) >= 0)
 728                 if (xpid == pid)
 729                         break;
 730         sigsetmask(omask);
 731         return(!locstat);
 732 }
 733
 734 static char *
 735 skip(char *cp)
 736 {
 737
 738         while (*cp != '\0' && isspace(*cp))
 739                 cp++;
 740         if (*cp == '\0' || *cp == '#')
 741                 return (NULL);
 742         return (cp);
 743 }
 744
 745 static char *
 746 word(char *cp)
 747 {
 748         char c;
 749
 750         while (*cp != '\0' && !isspace(*cp) && *cp != '#')
 751                 cp++;
 752         if ((c = *cp) != '\0') {
 753                 *cp++ = '\0';
 754                 if (c != '#')
 755                         return (skip(cp));
 756         }
 757         return (NULL);
 758 }
 759
 760 /*
 761  * Read an ascii label in from fd f,
 762  * in the same format as that put out by display(),
 763  * and fill in lp.
 764  */
 765 static int
 766 getasciilabel(FILE *f, struct disklabel *lp)
 767 {
 768         char *cp, *endp;
 769         const char **cpp;
 770         u_int part;
 771         char *tp, line[BUFSIZ];
 772         u_long v;
 773         int lineno = 0, errors = 0;
 774         int i;
 775
 776         makelabel("auto", lp);
 777         bzero(&part_set, sizeof(part_set));
 778         bzero(&part_size_type, sizeof(part_size_type));
 779         bzero(&part_offset_type, sizeof(part_offset_type));
 780         lp->d_bbsize = BBSIZE;                          /* XXX */
 781         lp->d_sbsize = 0;                               /* XXX */
 782         while (fgets(line, sizeof(line) - 1, f)) {
 783                 lineno++;
 784                 if ((cp = strchr(line,'\n')) != NULL)
 785                         *cp = '\0';
 786                 cp = skip(line);
 787                 if (cp == NULL)
 788                         continue;
 789                 tp = strchr(cp, ':');
 790                 if (tp == NULL) {
 791                         fprintf(stderr, "line %d: syntax error\n", lineno);
 792                         errors++;
 793                         continue;
 794                 }
 795                 *tp++ = '\0', tp = skip(tp);
 796                 if (!strcmp(cp, "type")) {
 797                         if (tp == NULL)
 798                                 tp = unknown;
 799                         cpp = dktypenames;
 800                         for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
 801                                 if (*cpp && !strcmp(*cpp, tp)) {
 802                                         lp->d_type = cpp - dktypenames;
 803                                         break;
 804                                 }
 805                         if (cpp < &dktypenames[DKMAXTYPES])
 806                                 continue;
 807                         errno = 0;
 808                         v = strtoul(tp, &endp, 10);
 809                         if (errno != 0 || *endp != '\0')
 810                                 v = DKMAXTYPES;
 811                         if (v >= DKMAXTYPES)
 812                                 fprintf(stderr, "line %d:%s %lu\n", lineno,
 813                                     "Warning, unknown disk type", v);
 814                         else
 815                                 lp->d_type = v;
 816                         continue;
 817                 }
 818                 if (!strcmp(cp, "flags")) {
 819                         for (v = 0; (cp = tp) && *cp != '\0';) {
 820                                 tp = word(cp);
 821                                 if (!strcmp(cp, "removeable"))
 822                                         v |= D_REMOVABLE;
 823                                 else if (!strcmp(cp, "ecc"))
 824                                         v |= D_ECC;
 825                                 else if (!strcmp(cp, "badsect"))
 826                                         v |= D_BADSECT;
 827                                 else {
 828                                         fprintf(stderr,
 829                                             "line %d: %s: bad flag\n",
 830                                             lineno, cp);
 831                                         errors++;
 832                                 }
 833                         }
 834                         lp->d_flags = v;
 835                         continue;
 836                 }
 837                 if (!strcmp(cp, "drivedata")) {
 838                         for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
 839                                 lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
 840                                 tp = word(cp);
 841                         }
 842                         continue;
 843                 }
 844                 if (sscanf(cp, "%lu partitions", &v) == 1) {
 845                         if (v > MAXPARTITIONS) {
 846                                 fprintf(stderr,
 847                                     "line %d: bad # of partitions\n", lineno);
 848                                 lp->d_npartitions = MAXPARTITIONS;
 849                                 errors++;
 850                         } else if (v < DEFPARTITIONS) {
 851                                 fprintf(stderr,
 852                                     "line %d: bad # of partitions\n", lineno);
 853                                 lp->d_npartitions = DEFPARTITIONS;
 854                                 errors++;
 855                         } else
 856                                 lp->d_npartitions = v;
 857                         continue;
 858                 }
 859                 if (tp == NULL)
 860                         tp = blank;
 861                 if (!strcmp(cp, "disk")) {
 862                         strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
 863                         continue;
 864                 }
 865                 if (!strcmp(cp, "label")) {
 866                         strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
 867                         continue;
 868                 }
 869                 if (!strcmp(cp, "bytes/sector")) {
 870                         v = strtoul(tp, NULL, 10);
 871                         if (v == 0 || (v % DEV_BSIZE) != 0) {
 872                                 fprintf(stderr,
 873                                     "line %d: %s: bad sector size\n",
 874                                     lineno, tp);
 875                                 errors++;
 876                         } else
 877                                 lp->d_secsize = v;
 878                         continue;
 879                 }
 880                 if (!strcmp(cp, "sectors/track")) {
 881                         v = strtoul(tp, NULL, 10);
 882 #if (ULONG_MAX != 0xffffffffUL)
 883                         if (v == 0 || v > 0xffffffff)
 884 #else
 885                         if (v == 0)
 886 #endif
 887                         {
 888                                 fprintf(stderr, "line %d: %s: bad %s\n",
 889                                     lineno, tp, cp);
 890                                 errors++;
 891                         } else
 892                                 lp->d_nsectors = v;
 893                         continue;
 894                 }
 895                 if (!strcmp(cp, "sectors/cylinder")) {
 896                         v = strtoul(tp, NULL, 10);
 897                         if (v == 0) {
 898                                 fprintf(stderr, "line %d: %s: bad %s\n",
 899                                     lineno, tp, cp);
 900                                 errors++;
 901                         } else
 902                                 lp->d_secpercyl = v;
 903                         continue;
 904                 }
 905                 if (!strcmp(cp, "tracks/cylinder")) {
 906                         v = strtoul(tp, NULL, 10);
 907                         if (v == 0) {
 908                                 fprintf(stderr, "line %d: %s: bad %s\n",
 909                                     lineno, tp, cp);
 910                                 errors++;
 911                         } else
 912                                 lp->d_ntracks = v;
 913                         continue;
 914                 }
 915                 if (!strcmp(cp, "cylinders")) {
 916                         v = strtoul(tp, NULL, 10);
 917                         if (v == 0) {
 918                                 fprintf(stderr, "line %d: %s: bad %s\n",
 919                                     lineno, tp, cp);
 920                                 errors++;
 921                         } else
 922                                 lp->d_ncylinders = v;
 923                         continue;
 924                 }
 925                 if (!strcmp(cp, "sectors/unit")) {
 926                         v = strtoul(tp, NULL, 10);
 927                         if (v == 0) {
 928                                 fprintf(stderr, "line %d: %s: bad %s\n",
 929                                     lineno, tp, cp);
 930                                 errors++;
 931                         } else
 932                                 lp->d_secperunit = v;
 933                         continue;
 934                 }
 935                 if (!strcmp(cp, "rpm")) {
 936                         v = strtoul(tp, NULL, 10);
 937                         if (v == 0 || v > USHRT_MAX) {
 938                                 fprintf(stderr, "line %d: %s: bad %s\n",
 939                                     lineno, tp, cp);
 940                                 errors++;
 941                         } else
 942                                 lp->d_rpm = v;
 943                         continue;
 944                 }
 945                 if (!strcmp(cp, "interleave")) {
 946                         v = strtoul(tp, NULL, 10);
 947                         if (v == 0 || v > USHRT_MAX) {
 948                                 fprintf(stderr, "line %d: %s: bad %s\n",
 949                                     lineno, tp, cp);
 950                                 errors++;
 951                         } else
 952                                 lp->d_interleave = v;
 953                         continue;
 954                 }
 955                 if (!strcmp(cp, "trackskew")) {
 956                         v = strtoul(tp, NULL, 10);
 957                         if (v > USHRT_MAX) {
 958                                 fprintf(stderr, "line %d: %s: bad %s\n",
 959                                     lineno, tp, cp);
 960                                 errors++;
 961                         } else
 962                                 lp->d_trackskew = v;
 963                         continue;
 964                 }
 965                 if (!strcmp(cp, "cylinderskew")) {
 966                         v = strtoul(tp, NULL, 10);
 967                         if (v > USHRT_MAX) {
 968                                 fprintf(stderr, "line %d: %s: bad %s\n",
 969                                     lineno, tp, cp);
 970                                 errors++;
 971                         } else
 972                                 lp->d_cylskew = v;
 973                         continue;
 974                 }
 975                 if (!strcmp(cp, "headswitch")) {
 976                         v = strtoul(tp, NULL, 10);
 977                         lp->d_headswitch = v;
 978                         continue;
 979                 }
 980                 if (!strcmp(cp, "track-to-track seek")) {
 981                         v = strtoul(tp, NULL, 10);
 982                         lp->d_trkseek = v;
 983                         continue;
 984                 }
 985                 /* the ':' was removed above */
 986                 if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
 987                         fprintf(stderr,
 988                             "line %d: %s: Unknown disklabel field\n", lineno,
 989                             cp);
 990                         errors++;
 991                         continue;
 992                 }
 993
 994                 /* Process a partition specification line. */
 995                 part = *cp - 'a';
 996                 if (part >= lp->d_npartitions) {
 997                         fprintf(stderr,
 998                             "line %d: partition name out of range a-%c: %s\n",
 999                             lineno, 'a' + lp->d_npartitions - 1, cp);
1000                         errors++;
1001                         continue;
1002                 }
1003                 part_set[part] = 1;
1004
1005                 if (getasciipartspec(tp, lp, part, lineno) != 0) {
1006                         errors++;
1007                         break;
1008                 }
1009         }
1010         errors += checklabel(lp);
1011         return (errors == 0);
1012 }
1013
1014 #define NXTNUM(n) do { \
1015         if (tp == NULL) { \
1016                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1017                 return (1); \
1018         } else { \
1019                 cp = tp, tp = word(cp); \
1020                 (n) = strtoul(cp, NULL, 10); \
1021         } \
1022 } while (0)
1023
1024 /* retain 1 character following number */
1025 #define NXTWORD(w,n) do { \
1026         if (tp == NULL) { \
1027                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1028                 return (1); \
1029         } else { \
1030                 char *tmp; \
1031                 cp = tp, tp = word(cp); \
1032                 (n) = strtoul(cp, &tmp, 10); \
1033                 if (tmp) (w) = *tmp; \
1034         } \
1035 } while (0)
1036
1037 /*
1038  * Read a partition line into partition `part' in the specified disklabel.
1039  * Return 0 on success, 1 on failure.
1040  */
1041 static int
1042 getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1043 {
1044         struct partition *pp;
1045         char *cp, *endp;
1046         const char **cpp;
1047         u_long v;
1048
1049         pp = &lp->d_partitions[part];
1050         cp = NULL;
1051
1052         v = 0;
1053         NXTWORD(part_size_type[part],v);
1054         if (v == 0 && part_size_type[part] != '*') {
1055                 fprintf(stderr,
1056                     "line %d: %s: bad partition size\n", lineno, cp);
1057                 return (1);
1058         }
1059         pp->p_size = v;
1060
1061         v = 0;
1062         NXTWORD(part_offset_type[part],v);
1063         if (v == 0 && part_offset_type[part] != '*' &&
1064             part_offset_type[part] != '\0') {
1065                 fprintf(stderr,
1066                     "line %d: %s: bad partition offset\n", lineno, cp);
1067                 return (1);
1068         }
1069         pp->p_offset = v;
1070         if (tp == NULL) {
1071                 fprintf(stderr, "line %d: missing file system type\n", lineno);
1072                 return (1);
1073         }
1074         cp = tp, tp = word(cp);
1075         for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1076                 if (*cpp && !strcmp(*cpp, cp))
1077                         break;
1078         if (*cpp != NULL) {
1079                 pp->p_fstype = cpp - fstypenames;
1080         } else {
1081                 if (isdigit(*cp)) {
1082                         errno = 0;
1083                         v = strtoul(cp, &endp, 10);
1084                         if (errno != 0 || *endp != '\0')
1085                                 v = FSMAXTYPES;
1086                 } else
1087                         v = FSMAXTYPES;
1088                 if (v >= FSMAXTYPES) {
1089                         fprintf(stderr,
1090                             "line %d: Warning, unknown file system type %s\n",
1091                             lineno, cp);
1092                         v = FS_UNUSED;
1093                 }
1094                 pp->p_fstype = v;
1095         }
1096
1097         switch (pp->p_fstype) {
1098         case FS_UNUSED:
1099         case FS_BSDFFS:
1100         case FS_BSDLFS:
1101                 /* accept defaults for fsize/frag/cpg */
1102                 if (tp) {
1103                         NXTNUM(pp->p_fsize);
1104                         if (pp->p_fsize == 0)
1105                                 break;
1106                         NXTNUM(v);
1107                         pp->p_frag = v / pp->p_fsize;
1108                         if (tp != NULL)
1109                                 NXTNUM(pp->p_cpg);
1110                 }
1111                 /* else default to 0's */
1112                 break;
1113         default:
1114                 break;
1115         }
1116         return (0);
1117 }
1118
1119 /*
1120  * Check disklabel for errors and fill in
1121  * derived fields according to supplied values.
1122  */
1123 static int
1124 checklabel(struct disklabel *lp)
1125 {
1126         struct partition *pp;
1127         int i, errors = 0;
1128         char part;
1129         u_long base_offset, needed, total_size, total_percent, current_offset;
1130         long free_space;
1131         int seen_default_offset;
1132         int hog_part;
1133         int j;
1134         struct partition *pp2;
1135
1136         if (lp == NULL)
1137                 lp = &lab;
1138
1139         if (allfields) {
1140
1141                 if (lp->d_secsize == 0) {
1142                         fprintf(stderr, "sector size 0\n");
1143                         return (1);
1144                 }
1145                 if (lp->d_nsectors == 0) {
1146                         fprintf(stderr, "sectors/track 0\n");
1147                         return (1);
1148                 }
1149                 if (lp->d_ntracks == 0) {
1150                         fprintf(stderr, "tracks/cylinder 0\n");
1151                         return (1);
1152                 }
1153                 if  (lp->d_ncylinders == 0) {
1154                         fprintf(stderr, "cylinders/unit 0\n");
1155                         errors++;
1156                 }
1157                 if (lp->d_rpm == 0)
1158                         warnx("revolutions/minute 0");
1159                 if (lp->d_secpercyl == 0)
1160                         lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1161                 if (lp->d_secperunit == 0)
1162                         lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1163                 if (lp->d_bbsize == 0) {
1164                         fprintf(stderr, "boot block size 0\n");
1165                         errors++;
1166                 } else if (lp->d_bbsize % lp->d_secsize)
1167                         warnx("boot block size %% sector-size != 0");
1168                 if (lp->d_npartitions > MAXPARTITIONS) {
1169                         warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1170                             (u_long)lp->d_npartitions, MAXPARTITIONS);
1171                         errors++;
1172                 }
1173                 if (lp->d_npartitions < DEFPARTITIONS) {
1174                         warnx("number of partitions (%lu) < DEFPARTITIONS (%d)",
1175                             (u_long)lp->d_npartitions, DEFPARTITIONS);
1176                         errors++;
1177                 }
1178         } else {
1179                 struct disklabel *vl;
1180
1181                 vl = getvirginlabel();
1182                 if (lp->d_secsize == 0)
1183                         lp->d_secsize = vl->d_secsize;
1184                 if (lp->d_nsectors == 0)
1185                         lp->d_nsectors = vl->d_nsectors;
1186                 if (lp->d_ntracks == 0)
1187                         lp->d_ntracks = vl->d_ntracks;
1188                 if (lp->d_ncylinders == 0)
1189                         lp->d_ncylinders = vl->d_ncylinders;
1190                 if (lp->d_rpm == 0)
1191                         lp->d_rpm = vl->d_rpm;
1192                 if (lp->d_interleave == 0)
1193                         lp->d_interleave = vl->d_interleave;
1194                 if (lp->d_secpercyl == 0)
1195                         lp->d_secpercyl = vl->d_secpercyl;
1196                 if (lp->d_secperunit == 0 ||
1197                     lp->d_secperunit > vl->d_secperunit)
1198                         lp->d_secperunit = vl->d_secperunit;
1199                 if (lp->d_bbsize == 0)
1200                         lp->d_bbsize = vl->d_bbsize;
1201                 if (lp->d_npartitions < DEFPARTITIONS ||
1202                     lp->d_npartitions > MAXPARTITIONS)
1203                         lp->d_npartitions = vl->d_npartitions;
1204         }
1205
1206
1207         /* first allocate space to the partitions, then offsets */
1208         total_size = 0; /* in sectors */
1209         total_percent = 0; /* in percent */
1210         hog_part = -1;
1211         /* find all fixed partitions */
1212         for (i = 0; i < lp->d_npartitions; i++) {
1213                 pp = &lp->d_partitions[i];
1214                 if (part_set[i]) {
1215                         if (part_size_type[i] == '*') {
1216                                 if (i == RAW_PART) {
1217                                         pp->p_size = lp->d_secperunit;
1218                                 } else {
1219                                         if (hog_part != -1)
1220                                                 warnx("Too many '*' partitions (%c and %c)",
1221                                                     hog_part + 'a',i + 'a');
1222                                         else
1223                                                 hog_part = i;
1224                                 }
1225                         } else {
1226                                 off_t size;
1227
1228                                 size = pp->p_size;
1229                                 switch (part_size_type[i]) {
1230                                 case '%':
1231                                         total_percent += size;
1232                                         break;
1233                                 case 't':
1234                                 case 'T':
1235                                         size *= 1024ULL;
1236                                         /* FALLTHROUGH */
1237                                 case 'g':
1238                                 case 'G':
1239                                         size *= 1024ULL;
1240                                         /* FALLTHROUGH */
1241                                 case 'm':
1242                                 case 'M':
1243                                         size *= 1024ULL;
1244                                         /* FALLTHROUGH */
1245                                 case 'k':
1246                                 case 'K':
1247                                         size *= 1024ULL;
1248                                         break;
1249                                 case '\0':
1250                                         break;
1251                                 default:
1252                                         warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1253                                             part_size_type[i], i + 'a');
1254                                         break;
1255                                 }
1256                                 /* don't count %'s yet */
1257                                 if (part_size_type[i] != '%') {
1258                                         /*
1259                                          * for all not in sectors, convert to
1260                                          * sectors
1261                                          */
1262                                         if (part_size_type[i] != '\0') {
1263                                                 if (size % lp->d_secsize != 0)
1264                                                         warnx("partition %c not an integer number of sectors",
1265                                                             i + 'a');
1266                                                 size /= lp->d_secsize;
1267                                                 pp->p_size = size;
1268                                         }
1269                                         /* else already in sectors */
1270                                         if (i != RAW_PART)
1271                                                 total_size += size;
1272                                 }
1273                         }
1274                 }
1275         }
1276
1277         /* Find out the total free space, excluding the boot block area. */
1278         base_offset = BBSIZE / secsize;
1279         free_space = 0;
1280         for (i = 0; i < lp->d_npartitions; i++) {
1281                 pp = &lp->d_partitions[i];
1282                 if (!part_set[i] || i == RAW_PART ||
1283                     part_size_type[i] == '%' || part_size_type[i] == '*')
1284                         continue;
1285                 if (pp->p_offset > base_offset)
1286                         free_space += pp->p_offset - base_offset;
1287                 if (pp->p_offset + pp->p_size > base_offset)
1288                         base_offset = pp->p_offset + pp->p_size;
1289         }
1290         if (base_offset < lp->d_secperunit)
1291                 free_space += lp->d_secperunit - base_offset;
1292
1293         /* handle % partitions - note %'s don't need to add up to 100! */
1294         if (total_percent != 0) {
1295                 if (total_percent > 100) {
1296                         fprintf(stderr,"total percentage %lu is greater than 100\n",
1297                             total_percent);
1298                         errors++;
1299                 }
1300
1301                 if (free_space > 0) {
1302                         for (i = 0; i < lp->d_npartitions; i++) {
1303                                 pp = &lp->d_partitions[i];
1304                                 if (part_set[i] && part_size_type[i] == '%') {
1305                                         /* careful of overflows! and integer roundoff */
1306                                         pp->p_size = ((double)pp->p_size/100) * free_space;
1307                                         total_size += pp->p_size;
1308
1309                                         /* FIX we can lose a sector or so due to roundoff per
1310                                            partition.  A more complex algorithm could avoid that */
1311                                 }
1312                         }
1313                 } else {
1314                         fprintf(stderr,
1315                             "%ld sectors available to give to '*' and '%%' partitions\n",
1316                             free_space);
1317                         errors++;
1318                         /* fix?  set all % partitions to size 0? */
1319                 }
1320         }
1321         /* give anything remaining to the hog partition */
1322         if (hog_part != -1) {
1323                 /*
1324                  * Find the range of offsets usable by '*' partitions around
1325                  * the hog partition and how much space they need.
1326                  */
1327                 needed = 0;
1328                 base_offset = BBSIZE / secsize;
1329                 for (i = hog_part - 1; i >= 0; i--) {
1330                         pp = &lp->d_partitions[i];
1331                         if (!part_set[i] || i == RAW_PART)
1332                                 continue;
1333                         if (part_offset_type[i] == '*') {
1334                                 needed += pp->p_size;
1335                                 continue;
1336                         }
1337                         base_offset = pp->p_offset + pp->p_size;
1338                         break;
1339                 }
1340                 current_offset = lp->d_secperunit;
1341                 for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1342                         pp = &lp->d_partitions[i];
1343                         if (!part_set[i] || i == RAW_PART)
1344                                 continue;
1345                         if (part_offset_type[i] == '*') {
1346                                 needed += pp->p_size;
1347                                 continue;
1348                         }
1349                         current_offset = pp->p_offset;
1350                 }
1351
1352                 if (current_offset - base_offset <= needed) {
1353                         fprintf(stderr, "Cannot find space for partition %c\n",
1354                             hog_part + 'a');
1355                         fprintf(stderr,
1356                             "Need more than %lu sectors between %lu and %lu\n",
1357                             needed, base_offset, current_offset);
1358                         errors++;
1359                         lp->d_partitions[hog_part].p_size = 0;
1360                 } else {
1361                         lp->d_partitions[hog_part].p_size = current_offset -
1362                             base_offset - needed;
1363                         total_size += lp->d_partitions[hog_part].p_size;
1364                 }
1365         }
1366
1367         /* Now set the offsets for each partition */
1368         current_offset = BBSIZE / secsize; /* in sectors */
1369         seen_default_offset = 0;
1370         for (i = 0; i < lp->d_npartitions; i++) {
1371                 part = 'a' + i;
1372                 pp = &lp->d_partitions[i];
1373                 if (part_set[i]) {
1374                         if (part_offset_type[i] == '*') {
1375                                 if (i == RAW_PART) {
1376                                         pp->p_offset = 0;
1377                                 } else {
1378                                         pp->p_offset = current_offset;
1379                                         seen_default_offset = 1;
1380                                 }
1381                         } else {
1382                                 /* allow them to be out of order for old-style tables */
1383                                 if (pp->p_offset < current_offset &&
1384                                     seen_default_offset && i != RAW_PART &&
1385                                     pp->p_fstype != FS_VINUM) {
1386                                         fprintf(stderr,
1387 "Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1388                                             (long)pp->p_offset,i+'a',current_offset);
1389                                         fprintf(stderr,
1390 "Labels with any *'s for offset must be in ascending order by sector\n");
1391                                         errors++;
1392                                 } else if (pp->p_offset != current_offset &&
1393                                     i != RAW_PART && seen_default_offset) {
1394                                         /*
1395                                          * this may give unneeded warnings if
1396                                          * partitions are out-of-order
1397                                          */
1398                                         warnx(
1399 "Offset %ld for partition %c doesn't match expected value %ld",
1400                                             (long)pp->p_offset, i + 'a', current_offset);
1401                                 }
1402                         }
1403                         if (i != RAW_PART)
1404                                 current_offset = pp->p_offset + pp->p_size;
1405                 }
1406         }
1407
1408         for (i = 0; i < lp->d_npartitions; i++) {
1409                 part = 'a' + i;
1410                 pp = &lp->d_partitions[i];
1411                 if (pp->p_size == 0 && pp->p_offset != 0)
1412                         warnx("partition %c: size 0, but offset %lu",
1413                             part, (u_long)pp->p_offset);
1414 #ifdef notdef
1415                 if (pp->p_size % lp->d_secpercyl)
1416                         warnx("partition %c: size %% cylinder-size != 0",
1417                             part);
1418                 if (pp->p_offset % lp->d_secpercyl)
1419                         warnx("partition %c: offset %% cylinder-size != 0",
1420                             part);
1421 #endif
1422                 if (pp->p_offset > lp->d_secperunit) {
1423                         fprintf(stderr,
1424                             "partition %c: offset past end of unit\n", part);
1425                         errors++;
1426                 }
1427                 if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1428                         fprintf(stderr,
1429                         "partition %c: partition extends past end of unit\n",
1430                             part);
1431                         errors++;
1432                 }
1433                 if (i == RAW_PART) {
1434                         if (pp->p_fstype != FS_UNUSED)
1435                                 warnx("partition %c is not marked as unused!",part);
1436                         if (pp->p_offset != 0)
1437                                 warnx("partition %c doesn't start at 0!",part);
1438                         if (pp->p_size != lp->d_secperunit)
1439                                 warnx("partition %c doesn't cover the whole unit!",part);
1440
1441                         if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1442                             (pp->p_size != lp->d_secperunit)) {
1443                                 warnx("An incorrect partition %c may cause problems for "
1444                                     "standard system utilities",part);
1445                         }
1446                 }
1447
1448                 /* check for overlaps */
1449                 /* this will check for all possible overlaps once and only once */
1450                 for (j = 0; j < i; j++) {
1451                         pp2 = &lp->d_partitions[j];
1452                         if (j != RAW_PART && i != RAW_PART &&
1453                             pp->p_fstype != FS_VINUM &&
1454                             pp2->p_fstype != FS_VINUM &&
1455                             part_set[i] && part_set[j]) {
1456                                 if (pp2->p_offset < pp->p_offset + pp->p_size &&
1457                                     (pp2->p_offset + pp2->p_size > pp->p_offset ||
1458                                         pp2->p_offset >= pp->p_offset)) {
1459                                         fprintf(stderr,"partitions %c and %c overlap!\n",
1460                                             j + 'a', i + 'a');
1461                                         errors++;
1462                                 }
1463                         }
1464                 }
1465         }
1466         for (; i < lp->d_npartitions; i++) {
1467                 part = 'a' + i;
1468                 pp = &lp->d_partitions[i];
1469                 if (pp->p_size || pp->p_offset)
1470                         warnx("unused partition %c: size %d offset %lu",
1471                             'a' + i, pp->p_size, (u_long)pp->p_offset);
1472         }
1473         return (errors);
1474 }
1475
1476 /*
1477  * When operating on a "virgin" disk, try getting an initial label
1478  * from the associated device driver.  This might work for all device
1479  * drivers that are able to fetch some initial device parameters
1480  * without even having access to a (BSD) disklabel, like SCSI disks,
1481  * most IDE drives, or vn devices.
1482  *
1483  * The device name must be given in its "canonical" form.
1484  */
1485 static struct disklabel *
1486 getvirginlabel(void)
1487 {
1488         static struct disklabel loclab;
1489         struct partition *dp;
1490         int f;
1491         u_int u;
1492
1493         if ((f = open(specname, O_RDONLY)) == -1) {
1494                 warn("cannot open %s", specname);
1495                 return (NULL);
1496         }
1497
1498         if (is_file)
1499                 get_file_parms(f);
1500         else {
1501                 mediasize = g_mediasize(f);
1502                 secsize = g_sectorsize(f);
1503                 if (secsize < 0 || mediasize < 0) {
1504                         close (f);
1505                         return (NULL);
1506                 }
1507         }
1508         memset(&loclab, 0, sizeof loclab);
1509         loclab.d_magic = DISKMAGIC;
1510         loclab.d_magic2 = DISKMAGIC;
1511         loclab.d_secsize = secsize;
1512         loclab.d_secperunit = mediasize / secsize;
1513
1514         /*
1515          * Nobody in these enlightened days uses the CHS geometry for
1516          * anything, but nonetheless try to get it right.  If we fail
1517          * to get any good ideas from the device, construct something
1518          * which is IBM-PC friendly.
1519          */
1520         if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1521                 loclab.d_nsectors = u;
1522         else
1523                 loclab.d_nsectors = 63;
1524         if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1525                 loclab.d_ntracks = u;
1526         else if (loclab.d_secperunit <= 63*1*1024)
1527                 loclab.d_ntracks = 1;
1528         else if (loclab.d_secperunit <= 63*16*1024)
1529                 loclab.d_ntracks = 16;
1530         else
1531                 loclab.d_ntracks = 255;
1532         loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1533         loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1534         loclab.d_npartitions = DEFPARTITIONS;
1535
1536         /* Various (unneeded) compat stuff */
1537         loclab.d_rpm = 3600;
1538         loclab.d_bbsize = BBSIZE;
1539         loclab.d_interleave = 1;
1540         strncpy(loclab.d_typename, "amnesiac",
1541             sizeof(loclab.d_typename));
1542
1543         dp = &loclab.d_partitions[RAW_PART];
1544         dp->p_size = loclab.d_secperunit;
1545         loclab.d_checksum = dkcksum(&loclab);
1546         close (f);
1547         return (&loclab);
1548 }
1549
1550 static void
1551 usage(void)
1552 {
1553
1554         fprintf(stderr,
1555         "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1556         "usage: bsdlabel disk",
1557         "\t\t(to read label)",
1558         "       bsdlabel -w [-n] [-m machine] disk [type]",
1559         "\t\t(to write label with existing boot program)",
1560         "       bsdlabel -e [-n] [-m machine] disk",
1561         "\t\t(to edit label)",
1562         "       bsdlabel -R [-n] [-m machine] disk protofile",
1563         "\t\t(to restore label with existing boot program)",
1564         "       bsdlabel -B [-b boot] [-m machine] disk",
1565         "\t\t(to install boot program with existing on-disk label)",
1566         "       bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1567         "\t\t(to write label and install boot program)",
1568         "       bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1569                 "\t\t(to restore label and install boot program)"
1570         );
1571         exit(1);
1572 }