sbin/gpt/gpt.c

   1 /*-
   2  * Copyright (c) 2002 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * CRC32 code derived from work by Gary S. Brown.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/types.h>
  34 #include <sys/disk.h>
  35 #include <sys/stat.h>
  36
  37 #include <err.h>
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <paths.h>
  41 #include <stddef.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 #include "map.h"
  48 #include "gpt.h"
  49
  50 char    device_path[MAXPATHLEN];
  51 char    *device_name;
  52
  53 off_t   mediasz;
  54
  55 u_int   parts;
  56 u_int   secsz;
  57
  58 int     readonly, verbose;
  59
  60 static uint32_t crc32_tab[] = {
  61         0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
  62         0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  63         0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
  64         0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  65         0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  66         0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  67         0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
  68         0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  69         0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
  70         0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  71         0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
  72         0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  73         0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
  74         0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  75         0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  76         0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  77         0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
  78         0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  79         0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
  80         0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  81         0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
  82         0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  83         0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
  84         0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  85         0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  86         0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  87         0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
  88         0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  89         0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
  90         0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  91         0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
  92         0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  93         0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
  94         0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  95         0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  96         0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  97         0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
  98         0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  99         0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
 100         0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
 101         0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
 102         0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
 103         0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 104 };
 105
 106 uint32_t
 107 crc32(const void *buf, size_t size)
 108 {
 109         const uint8_t *p;
 110         uint32_t crc;
 111
 112         p = buf;
 113         crc = ~0U;
 114
 115         while (size--)
 116                 crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
 117
 118         return crc ^ ~0U;
 119 }
 120
 121 uint8_t *
 122 utf16_to_utf8(uint16_t *s16)
 123 {
 124         static uint8_t *s8 = NULL;
 125         static size_t s8len = 0;
 126         size_t s8idx, s16idx, s16len;
 127         uint32_t utfchar;
 128         unsigned int c;
 129
 130         s16len = 0;
 131         while (s16[s16len++] != 0)
 132                 ;
 133         if (s8len < s16len * 3) {
 134                 if (s8 != NULL)
 135                         free(s8);
 136                 s8len = s16len * 3;
 137                 s8 = calloc(s16len, 3);
 138         }
 139         s8idx = s16idx = 0;
 140         while (s16idx < s16len) {
 141                 utfchar = le16toh(s16[s16idx++]);
 142                 if ((utfchar & 0xf800) == 0xd800) {
 143                         c = le16toh(s16[s16idx]);
 144                         if ((utfchar & 0x400) != 0 || (c & 0xfc00) != 0xdc00)
 145                                 utfchar = 0xfffd;
 146                         else
 147                                 s16idx++;
 148                 }
 149                 if (utfchar < 0x80) {
 150                         s8[s8idx++] = utfchar;
 151                 } else if (utfchar < 0x800) {
 152                         s8[s8idx++] = 0xc0 | (utfchar >> 6);
 153                         s8[s8idx++] = 0x80 | (utfchar & 0x3f);
 154                 } else if (utfchar < 0x10000) {
 155                         s8[s8idx++] = 0xe0 | (utfchar >> 12);
 156                         s8[s8idx++] = 0x80 | ((utfchar >> 6) & 0x3f);
 157                         s8[s8idx++] = 0x80 | (utfchar & 0x3f);
 158                 } else if (utfchar < 0x200000) {
 159                         s8[s8idx++] = 0xf0 | (utfchar >> 18);
 160                         s8[s8idx++] = 0x80 | ((utfchar >> 12) & 0x3f);
 161                         s8[s8idx++] = 0x80 | ((utfchar >> 6) & 0x3f);
 162                         s8[s8idx++] = 0x80 | (utfchar & 0x3f);
 163                 }
 164         }
 165         return (s8);
 166 }
 167
 168 void
 169 utf8_to_utf16(const uint8_t *s8, uint16_t *s16, size_t s16len)
 170 {
 171         size_t s16idx, s8idx, s8len;
 172         uint32_t utfchar;
 173         unsigned int c, utfbytes;
 174
 175         s8len = 0;
 176         while (s8[s8len++] != 0)
 177                 ;
 178         s8idx = s16idx = 0;
 179         utfbytes = 0;
 180         do {
 181                 c = s8[s8idx++];
 182                 if ((c & 0xc0) != 0x80) {
 183                         /* Initial characters. */
 184                         if (utfbytes != 0) {
 185                                 /* Incomplete encoding. */
 186                                 s16[s16idx++] = 0xfffd;
 187                                 if (s16idx == s16len) {
 188                                         s16[--s16idx] = 0;
 189                                         return;
 190                                 }
 191                         }
 192                         if ((c & 0xf8) == 0xf0) {
 193                                 utfchar = c & 0x07;
 194                                 utfbytes = 3;
 195                         } else if ((c & 0xf0) == 0xe0) {
 196                                 utfchar = c & 0x0f;
 197                                 utfbytes = 2;
 198                         } else if ((c & 0xe0) == 0xc0) {
 199                                 utfchar = c & 0x1f;
 200                                 utfbytes = 1;
 201                         } else {
 202                                 utfchar = c & 0x7f;
 203                                 utfbytes = 0;
 204                         }
 205                 } else {
 206                         /* Followup characters. */
 207                         if (utfbytes > 0) {
 208                                 utfchar = (utfchar << 6) + (c & 0x3f);
 209                                 utfbytes--;
 210                         } else if (utfbytes == 0)
 211                                 utfbytes = -1;
 212                 }
 213                 if (utfbytes == 0) {
 214                         if (utfchar >= 0x10000 && s16idx + 2 >= s16len)
 215                                 utfchar = 0xfffd;
 216                         if (utfchar >= 0x10000) {
 217                                 s16[s16idx++] = 0xd800 | ((utfchar>>10)-0x40);
 218                                 s16[s16idx++] = 0xdc00 | (utfchar & 0x3ff);
 219                         } else
 220                                 s16[s16idx++] = utfchar;
 221                         if (s16idx == s16len) {
 222                                 s16[--s16idx] = 0;
 223                                 return;
 224                         }
 225                 }
 226         } while (c != 0);
 227 }
 228
 229 void
 230 le_uuid_dec(void const *buf, uuid_t *uuid)
 231 {
 232         u_char const *p;
 233         int i;
 234
 235         p = buf;
 236         uuid->time_low = le32dec(p);
 237         uuid->time_mid = le16dec(p + 4);
 238         uuid->time_hi_and_version = le16dec(p + 6);
 239         uuid->clock_seq_hi_and_reserved = p[8];
 240         uuid->clock_seq_low = p[9];
 241         for (i = 0; i < _UUID_NODE_LEN; i++)
 242                 uuid->node[i] = p[10 + i];
 243 }
 244
 245 void
 246 le_uuid_enc(void *buf, uuid_t const *uuid)
 247 {
 248         u_char *p;
 249         int i;
 250
 251         p = buf;
 252         le32enc(p, uuid->time_low);
 253         le16enc(p + 4, uuid->time_mid);
 254         le16enc(p + 6, uuid->time_hi_and_version);
 255         p[8] = uuid->clock_seq_hi_and_reserved;
 256         p[9] = uuid->clock_seq_low;
 257         for (i = 0; i < _UUID_NODE_LEN; i++)
 258                 p[10 + i] = uuid->node[i];
 259 }
 260
 261 int
 262 parse_uuid(const char *s, uuid_t *uuid)
 263 {
 264         uint32_t status;
 265
 266         uuid_from_string(s, uuid, &status);
 267         if (status == uuid_s_ok)
 268                 return (0);
 269
 270         switch (*s) {
 271         case 'e':
 272                 if (strcmp(s, "efi") == 0) {
 273                         uuid_t efi = GPT_ENT_TYPE_EFI;
 274                         *uuid = efi;
 275                         return (0);
 276                 }
 277                 break;
 278         case 'h':
 279                 if (strcmp(s, "hfs") == 0) {
 280                         uuid_t hfs = GPT_ENT_TYPE_APPLE_HFS;
 281                         *uuid = hfs;
 282                         return (0);
 283                 }
 284                 break;
 285         case 'l':
 286                 if (strcmp(s, "linux") == 0) {
 287                         uuid_t lnx = GPT_ENT_TYPE_MS_BASIC_DATA;
 288                         *uuid = lnx;
 289                         return (0);
 290                 }
 291                 break;
 292         case 's':
 293                 if (strcmp(s, "swap") == 0) {
 294                         uuid_t sw = GPT_ENT_TYPE_FREEBSD_SWAP;
 295                         *uuid = sw;
 296                         return (0);
 297                 }
 298                 break;
 299         case 'u':
 300                 if (strcmp(s, "ufs") == 0) {
 301                         uuid_t ufs = GPT_ENT_TYPE_FREEBSD_UFS;
 302                         *uuid = ufs;
 303                         return (0);
 304                 }
 305                 break;
 306         case 'w':
 307                 if (strcmp(s, "windows") == 0) {
 308                         uuid_t win = GPT_ENT_TYPE_MS_BASIC_DATA;
 309                         *uuid = win;
 310                         return (0);
 311                 }
 312                 break;
 313         }
 314         return (EINVAL);
 315 }
 316
 317 void*
 318 gpt_read(int fd, off_t lba, size_t count)
 319 {
 320         off_t ofs;
 321         void *buf;
 322
 323         count *= secsz;
 324         buf = malloc(count);
 325         if (buf == NULL)
 326                 return (NULL);
 327
 328         ofs = lba * secsz;
 329         if (lseek(fd, ofs, SEEK_SET) == ofs &&
 330             read(fd, buf, count) == (ssize_t)count)
 331                 return (buf);
 332
 333         free(buf);
 334         return (NULL);
 335 }
 336
 337 int
 338 gpt_write(int fd, map_t *map)
 339 {
 340         off_t ofs;
 341         size_t count;
 342
 343         count = map->map_size * secsz;
 344         ofs = map->map_start * secsz;
 345         if (lseek(fd, ofs, SEEK_SET) == ofs &&
 346             write(fd, map->map_data, count) == (ssize_t)count)
 347                 return (0);
 348         return (-1);
 349 }
 350
 351 static int
 352 gpt_mbr(int fd, off_t lba)
 353 {
 354         struct mbr *mbr;
 355         map_t *m, *p;
 356         off_t size, start;
 357         unsigned int i, pmbr;
 358
 359         mbr = gpt_read(fd, lba, 1);
 360         if (mbr == NULL)
 361                 return (-1);
 362
 363         if (mbr->mbr_sig != htole16(MBR_SIG)) {
 364                 if (verbose)
 365                         warnx("%s: MBR not found at sector %llu", device_name,
 366                             (long long)lba);
 367                 free(mbr);
 368                 return (0);
 369         }
 370
 371         /*
 372          * Differentiate between a regular MBR and a PMBR. This is more
 373          * convenient in general. A PMBR is one with a single partition
 374          * of type 0xee.
 375          */
 376         pmbr = 0;
 377         for (i = 0; i < 4; i++) {
 378                 if (mbr->mbr_part[i].part_typ == 0)
 379                         continue;
 380                 if (mbr->mbr_part[i].part_typ == 0xee)
 381                         pmbr++;
 382                 else
 383                         break;
 384         }
 385         if (pmbr && i == 4 && lba == 0) {
 386                 if (pmbr != 1)
 387                         warnx("%s: Suspicious PMBR at sector %llu",
 388                             device_name, (long long)lba);
 389                 else if (verbose > 1)
 390                         warnx("%s: PMBR at sector %llu", device_name,
 391                             (long long)lba);
 392                 p = map_add(lba, 1LL, MAP_TYPE_PMBR, mbr);
 393                 return ((p == NULL) ? -1 : 0);
 394         }
 395         if (pmbr)
 396                 warnx("%s: Suspicious MBR at sector %llu", device_name,
 397                     (long long)lba);
 398         else if (verbose > 1)
 399                 warnx("%s: MBR at sector %llu", device_name, (long long)lba);
 400
 401         p = map_add(lba, 1LL, MAP_TYPE_MBR, mbr);
 402         if (p == NULL)
 403                 return (-1);
 404         for (i = 0; i < 4; i++) {
 405                 if (mbr->mbr_part[i].part_typ == 0 ||
 406                     mbr->mbr_part[i].part_typ == 0xee)
 407                         continue;
 408                 start = le16toh(mbr->mbr_part[i].part_start_hi);
 409                 start = (start << 16) + le16toh(mbr->mbr_part[i].part_start_lo);
 410                 size = le16toh(mbr->mbr_part[i].part_size_hi);
 411                 size = (size << 16) + le16toh(mbr->mbr_part[i].part_size_lo);
 412                 if (start == 0 && size == 0) {
 413                         warnx("%s: Malformed MBR at sector %llu", device_name,
 414                             (long long)lba);
 415                         continue;
 416                 }
 417                 /* start is relative to the offset of the MBR itself. */
 418                 start += lba;
 419                 if (verbose > 2)
 420                         warnx("%s: MBR part: type=%d, start=%llu, size=%llu",
 421                             device_name, mbr->mbr_part[i].part_typ,
 422                             (long long)start, (long long)size);
 423                 if (mbr->mbr_part[i].part_typ != 15) {
 424                         m = map_add(start, size, MAP_TYPE_MBR_PART, p);
 425                         if (m == NULL)
 426                                 return (-1);
 427                         m->map_index = i + 1;
 428                 } else {
 429                         if (gpt_mbr(fd, start) == -1)
 430                                 return (-1);
 431                 }
 432         }
 433         return (0);
 434 }
 435
 436 static int
 437 gpt_gpt(int fd, off_t lba)
 438 {
 439         uuid_t type;
 440         off_t size;
 441         struct gpt_ent *ent;
 442         struct gpt_hdr *hdr;
 443         char *p, *s;
 444         map_t *m;
 445         size_t blocks, tblsz;
 446         unsigned int i;
 447         uint32_t crc;
 448
 449         hdr = gpt_read(fd, lba, 1);
 450         if (hdr == NULL)
 451                 return (-1);
 452
 453         if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)))
 454                 goto fail_hdr;
 455
 456         crc = le32toh(hdr->hdr_crc_self);
 457         hdr->hdr_crc_self = 0;
 458         if (crc32(hdr, le32toh(hdr->hdr_size)) != crc) {
 459                 if (verbose)
 460                         warnx("%s: Bad CRC in GPT header at sector %llu",
 461                             device_name, (long long)lba);
 462                 goto fail_hdr;
 463         }
 464
 465         tblsz = le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz);
 466         blocks = tblsz / secsz + ((tblsz % secsz) ? 1 : 0);
 467
 468         /* Use generic pointer to deal with hdr->hdr_entsz != sizeof(*ent). */
 469         p = gpt_read(fd, le64toh(hdr->hdr_lba_table), blocks);
 470         if (p == NULL)
 471                 return (-1);
 472
 473         if (crc32(p, tblsz) != le32toh(hdr->hdr_crc_table)) {
 474                 if (verbose)
 475                         warnx("%s: Bad CRC in GPT table at sector %llu",
 476                             device_name,
 477                             (long long)le64toh(hdr->hdr_lba_table));
 478                 goto fail_ent;
 479         }
 480
 481         if (verbose > 1)
 482                 warnx("%s: %s GPT at sector %llu", device_name,
 483                     (lba == 1) ? "Pri" : "Sec", (long long)lba);
 484
 485         m = map_add(lba, 1, (lba == 1)
 486             ? MAP_TYPE_PRI_GPT_HDR : MAP_TYPE_SEC_GPT_HDR, hdr);
 487         if (m == NULL)
 488                 return (-1);
 489
 490         m = map_add(le64toh(hdr->hdr_lba_table), blocks, (lba == 1)
 491             ? MAP_TYPE_PRI_GPT_TBL : MAP_TYPE_SEC_GPT_TBL, p);
 492         if (m == NULL)
 493                 return (-1);
 494
 495         if (lba != 1)
 496                 return (0);
 497
 498         for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
 499                 ent = (void*)(p + i * le32toh(hdr->hdr_entsz));
 500                 if (uuid_is_nil(&ent->ent_type, NULL))
 501                         continue;
 502
 503                 size = le64toh(ent->ent_lba_end) - le64toh(ent->ent_lba_start) +
 504                     1LL;
 505                 if (verbose > 2) {
 506                         le_uuid_dec(&ent->ent_type, &type);
 507                         uuid_to_string(&type, &s, NULL);
 508                         warnx(
 509         "%s: GPT partition: type=%s, start=%llu, size=%llu", device_name, s,
 510                             (long long)le64toh(ent->ent_lba_start),
 511                             (long long)size);
 512                         free(s);
 513                 }
 514                 m = map_add(le64toh(ent->ent_lba_start), size,
 515                     MAP_TYPE_GPT_PART, ent);
 516                 if (m == NULL)
 517                         return (-1);
 518                 m->map_index = i + 1;
 519         }
 520         return (0);
 521
 522  fail_ent:
 523         free(p);
 524
 525  fail_hdr:
 526         free(hdr);
 527         return (0);
 528 }
 529
 530 int
 531 gpt_open(const char *dev)
 532 {
 533         struct stat sb;
 534         int fd, mode;
 535
 536         mode = readonly ? O_RDONLY : O_RDWR|O_EXCL;
 537
 538         strlcpy(device_path, dev, sizeof(device_path));
 539         device_name = device_path;
 540
 541         if ((fd = open(device_path, mode)) != -1)
 542                 goto found;
 543
 544         snprintf(device_path, sizeof(device_path), "%s%s", _PATH_DEV, dev);
 545         device_name = device_path + strlen(_PATH_DEV);
 546         if ((fd = open(device_path, mode)) != -1)
 547                 goto found;
 548
 549         return (-1);
 550
 551  found:
 552         if (fstat(fd, &sb) == -1)
 553                 goto close;
 554
 555         if ((sb.st_mode & S_IFMT) != S_IFREG) {
 556                 if (ioctl(fd, DIOCGSECTORSIZE, &secsz) == -1 ||
 557                     ioctl(fd, DIOCGMEDIASIZE, &mediasz) == -1)
 558                         goto close;
 559         } else {
 560                 secsz = 512;    /* Fixed size for files. */
 561                 if (sb.st_size % secsz) {
 562                         errno = EINVAL;
 563                         goto close;
 564                 }
 565                 mediasz = sb.st_size;
 566         }
 567
 568         /*
 569          * We require an absolute minimum of 6 sectors. One for the MBR,
 570          * 2 for the GPT header, 2 for the GPT table and one to hold some
 571          * user data. Let's catch this extreme border case here so that
 572          * we don't have to worry about it later.
 573          */
 574         if (mediasz / secsz < 6) {
 575                 errno = ENODEV;
 576                 goto close;
 577         }
 578
 579         if (verbose)
 580                 warnx("%s: mediasize=%llu; sectorsize=%u; blocks=%llu",
 581                     device_name, (long long)mediasz, secsz,
 582                     (long long)(mediasz / secsz));
 583
 584         map_init(mediasz / secsz);
 585
 586         if (gpt_mbr(fd, 0LL) == -1)
 587                 goto close;
 588         if (gpt_gpt(fd, 1LL) == -1)
 589                 goto close;
 590         if (gpt_gpt(fd, mediasz / secsz - 1LL) == -1)
 591                 goto close;
 592
 593         return (fd);
 594
 595  close:
 596         close(fd);
 597         return (-1);
 598 }
 599
 600 void
 601 gpt_close(int fd)
 602 {
 603         /* XXX post processing? */
 604         close(fd);
 605 }
 606
 607 static struct {
 608         int (*fptr)(int, char *[]);
 609         const char *name;
 610 } cmdsw[] = {
 611         { cmd_add, "add" },
 612         { cmd_boot, "boot" },
 613         { cmd_create, "create" },
 614         { cmd_destroy, "destroy" },
 615         { NULL, "help" },
 616         { cmd_label, "label" },
 617         { cmd_migrate, "migrate" },
 618         { cmd_recover, "recover" },
 619         { cmd_remove, "remove" },
 620         { NULL, "rename" },
 621         { cmd_show, "show" },
 622         { NULL, "verify" },
 623         { NULL, NULL }
 624 };
 625
 626 static void
 627 usage(void)
 628 {
 629
 630         fprintf(stderr,
 631             "usage: %s [-rv] [-p nparts] command [options] device ...\n",
 632             getprogname());
 633         exit(1);
 634 }
 635
 636 static void
 637 prefix(const char *cmd)
 638 {
 639         char *pfx;
 640         const char *prg;
 641
 642         prg = getprogname();
 643         pfx = malloc(strlen(prg) + strlen(cmd) + 2);
 644         /* Don't bother failing. It's not important */
 645         if (pfx == NULL)
 646                 return;
 647
 648         sprintf(pfx, "%s %s", prg, cmd);
 649         setprogname(pfx);
 650 }
 651
 652 int
 653 main(int argc, char *argv[])
 654 {
 655         char *cmd, *p;
 656         int ch, i;
 657
 658         /* Get the generic options */
 659         while ((ch = getopt(argc, argv, "p:rv")) != -1) {
 660                 switch(ch) {
 661                 case 'p':
 662                         if (parts > 0)
 663                                 usage();
 664                         parts = strtol(optarg, &p, 10);
 665                         if (*p != 0 || parts < 1)
 666                                 usage();
 667                         break;
 668                 case 'r':
 669                         readonly = 1;
 670                         break;
 671                 case 'v':
 672                         verbose++;
 673                         break;
 674                 default:
 675                         usage();
 676                 }
 677         }
 678         if (!parts)
 679                 parts = 128;
 680
 681         if (argc == optind)
 682                 usage();
 683
 684         cmd = argv[optind++];
 685         for (i = 0; cmdsw[i].name != NULL && strcmp(cmd, cmdsw[i].name); i++);
 686
 687         if (cmdsw[i].fptr == NULL)
 688                 errx(1, "unknown command: %s", cmd);
 689
 690         prefix(cmd);
 691         return ((*cmdsw[i].fptr)(argc, argv));
 692 }