cmd/gpt.c

   1 /*
   2  * cmd_gpt.c -- GPT (GUID Partition Table) handling command
   3  *
   4  * Copyright (C) 2015
   5  * Lukasz Majewski <l.majewski@majess.pl>
   6  *
   7  * Copyright (C) 2012 Samsung Electronics
   8  * author: Lukasz Majewski <l.majewski@samsung.com>
   9  * author: Piotr Wilczek <p.wilczek@samsung.com>
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13
  14 #include <common.h>
  15 #include <malloc.h>
  16 #include <command.h>
  17 #include <part_efi.h>
  18 #include <exports.h>
  19 #include <linux/ctype.h>
  20 #include <div64.h>
  21 #include <memalign.h>
  22
  23 #ifndef CONFIG_PARTITION_UUIDS
  24 #error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
  25 #endif
  26
  27 /**
  28  * extract_env(): Expand env name from string format '&{env_name}'
  29  *                and return pointer to the env (if the env is set)
  30  *
  31  * @param str - pointer to string
  32  * @param env - pointer to pointer to extracted env
  33  *
  34  * @return - zero on successful expand and env is set
  35  */
  36 static int extract_env(const char *str, char **env)
  37 {
  38         int ret = -1;
  39         char *e, *s;
  40 #ifdef CONFIG_RANDOM_UUID
  41         char uuid_str[UUID_STR_LEN + 1];
  42 #endif
  43
  44         if (!str || strlen(str) < 4)
  45                 return -1;
  46
  47         if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
  48                 return -1;
  49
  50         s = strdup(str);
  51         if (s == NULL)
  52                 return -1;
  53
  54         memset(s + strlen(s) - 1, '\0', 1);
  55         memmove(s, s + 2, strlen(s) - 1);
  56
  57         e = getenv(s);
  58         if (e == NULL) {
  59 #ifdef CONFIG_RANDOM_UUID
  60                 debug("%s unset. ", str);
  61                 gen_rand_uuid_str(uuid_str, UUID_STR_FORMAT_STD);
  62                 setenv(s, uuid_str);
  63
  64                 e = getenv(s);
  65                 if (e) {
  66                         debug("Set to random.\n");
  67                         ret = 0;
  68                 } else {
  69                         debug("Can't get random UUID.\n");
  70                 }
  71 #else
  72                 debug("%s unset.\n", str);
  73 #endif
  74         } else {
  75                 debug("%s get from environment.\n", str);
  76                 ret = 0;
  77         }
  78
  79         *env = e;
  80         free(s);
  81
  82         return ret;
  83 }
  84
  85 /**
  86  * extract_val(): Extract value from a key=value pair list (comma separated).
  87  *                Only value for the given key is returend.
  88  *                Function allocates memory for the value, remember to free!
  89  *
  90  * @param str - pointer to string with key=values pairs
  91  * @param key - pointer to the key to search for
  92  *
  93  * @return - pointer to allocated string with the value
  94  */
  95 static char *extract_val(const char *str, const char *key)
  96 {
  97         char *v, *k;
  98         char *s, *strcopy;
  99         char *new = NULL;
 100
 101         strcopy = strdup(str);
 102         if (strcopy == NULL)
 103                 return NULL;
 104
 105         s = strcopy;
 106         while (s) {
 107                 v = strsep(&s, ",");
 108                 if (!v)
 109                         break;
 110                 k = strsep(&v, "=");
 111                 if (!k)
 112                         break;
 113                 if  (strcmp(k, key) == 0) {
 114                         new = strdup(v);
 115                         break;
 116                 }
 117         }
 118
 119         free(strcopy);
 120
 121         return new;
 122 }
 123
 124 /**
 125  * found_key(): Found key without value in parameter list (comma separated).
 126  *
 127  * @param str - pointer to string with key
 128  * @param key - pointer to the key to search for
 129  *
 130  * @return - true on found key
 131  */
 132 static bool found_key(const char *str, const char *key)
 133 {
 134         char *k;
 135         char *s, *strcopy;
 136         bool result = false;
 137
 138         strcopy = strdup(str);
 139         if (!strcopy)
 140                 return NULL;
 141
 142         s = strcopy;
 143         while (s) {
 144                 k = strsep(&s, ",");
 145                 if (!k)
 146                         break;
 147                 if  (strcmp(k, key) == 0) {
 148                         result = true;
 149                         break;
 150                 }
 151         }
 152
 153         free(strcopy);
 154
 155         return result;
 156 }
 157
 158 /**
 159  * set_gpt_info(): Fill partition information from string
 160  *              function allocates memory, remember to free!
 161  *
 162  * @param dev_desc - pointer block device descriptor
 163  * @param str_part - pointer to string with partition information
 164  * @param str_disk_guid - pointer to pointer to allocated string with disk guid
 165  * @param partitions - pointer to pointer to allocated partitions array
 166  * @param parts_count - number of partitions
 167  *
 168  * @return - zero on success, otherwise error
 169  *
 170  */
 171 static int set_gpt_info(struct blk_desc *dev_desc,
 172                         const char *str_part,
 173                         char **str_disk_guid,
 174                         disk_partition_t **partitions,
 175                         u8 *parts_count)
 176 {
 177         char *tok, *str, *s;
 178         int i;
 179         char *val, *p;
 180         int p_count;
 181         disk_partition_t *parts;
 182         int errno = 0;
 183         uint64_t size_ll, start_ll;
 184         lbaint_t offset = 0;
 185
 186         debug("%s:  lba num: 0x%x %d\n", __func__,
 187               (unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
 188
 189         if (str_part == NULL)
 190                 return -1;
 191
 192         str = strdup(str_part);
 193
 194         /* extract disk guid */
 195         s = str;
 196         val = extract_val(str, "uuid_disk");
 197         if (!val) {
 198 #ifdef CONFIG_RANDOM_UUID
 199                 *str_disk_guid = malloc(UUID_STR_LEN + 1);
 200                 gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
 201 #else
 202                 free(str);
 203                 return -2;
 204 #endif
 205         } else {
 206                 val = strsep(&val, ";");
 207                 if (extract_env(val, &p))
 208                         p = val;
 209                 *str_disk_guid = strdup(p);
 210                 free(val);
 211                 /* Move s to first partition */
 212                 strsep(&s, ";");
 213         }
 214         if (strlen(s) == 0)
 215                 return -3;
 216
 217         i = strlen(s) - 1;
 218         if (s[i] == ';')
 219                 s[i] = '\0';
 220
 221         /* calculate expected number of partitions */
 222         p_count = 1;
 223         p = s;
 224         while (*p) {
 225                 if (*p++ == ';')
 226                         p_count++;
 227         }
 228
 229         /* allocate memory for partitions */
 230         parts = calloc(sizeof(disk_partition_t), p_count);
 231
 232         /* retrieve partitions data from string */
 233         for (i = 0; i < p_count; i++) {
 234                 tok = strsep(&s, ";");
 235
 236                 if (tok == NULL)
 237                         break;
 238
 239                 /* uuid */
 240                 val = extract_val(tok, "uuid");
 241                 if (!val) {
 242                         /* 'uuid' is optional if random uuid's are enabled */
 243 #ifdef CONFIG_RANDOM_UUID
 244                         gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
 245 #else
 246                         errno = -4;
 247                         goto err;
 248 #endif
 249                 } else {
 250                         if (extract_env(val, &p))
 251                                 p = val;
 252                         if (strlen(p) >= sizeof(parts[i].uuid)) {
 253                                 printf("Wrong uuid format for partition %d\n", i);
 254                                 errno = -4;
 255                                 goto err;
 256                         }
 257                         strcpy((char *)parts[i].uuid, p);
 258                         free(val);
 259                 }
 260 #ifdef CONFIG_PARTITION_TYPE_GUID
 261                 /* guid */
 262                 val = extract_val(tok, "type");
 263                 if (val) {
 264                         /* 'type' is optional */
 265                         if (extract_env(val, &p))
 266                                 p = val;
 267                         if (strlen(p) >= sizeof(parts[i].type_guid)) {
 268                                 printf("Wrong type guid format for partition %d\n",
 269                                        i);
 270                                 errno = -4;
 271                                 goto err;
 272                         }
 273                         strcpy((char *)parts[i].type_guid, p);
 274                         free(val);
 275                 }
 276 #endif
 277                 /* name */
 278                 val = extract_val(tok, "name");
 279                 if (!val) { /* name is mandatory */
 280                         errno = -4;
 281                         goto err;
 282                 }
 283                 if (extract_env(val, &p))
 284                         p = val;
 285                 if (strlen(p) >= sizeof(parts[i].name)) {
 286                         errno = -4;
 287                         goto err;
 288                 }
 289                 strcpy((char *)parts[i].name, p);
 290                 free(val);
 291
 292                 /* size */
 293                 val = extract_val(tok, "size");
 294                 if (!val) { /* 'size' is mandatory */
 295                         errno = -4;
 296                         goto err;
 297                 }
 298                 if (extract_env(val, &p))
 299                         p = val;
 300                 if ((strcmp(p, "-") == 0)) {
 301                         /* remove first usable lba and last block */
 302                         parts[i].size = dev_desc->lba - 34  - 1 - offset;
 303                 } else {
 304                         size_ll = ustrtoull(p, &p, 0);
 305                         parts[i].size = lldiv(size_ll, dev_desc->blksz);
 306                 }
 307
 308                 free(val);
 309
 310                 /* start address */
 311                 val = extract_val(tok, "start");
 312                 if (val) { /* start address is optional */
 313                         if (extract_env(val, &p))
 314                                 p = val;
 315                         start_ll = ustrtoull(p, &p, 0);
 316                         parts[i].start = lldiv(start_ll, dev_desc->blksz);
 317                         free(val);
 318                 }
 319
 320                 offset += parts[i].size + parts[i].start;
 321
 322                 /* bootable */
 323                 if (found_key(tok, "bootable"))
 324                         parts[i].bootable = 1;
 325         }
 326
 327         *parts_count = p_count;
 328         *partitions = parts;
 329         free(str);
 330
 331         return 0;
 332 err:
 333         free(str);
 334         free(*str_disk_guid);
 335         free(parts);
 336
 337         return errno;
 338 }
 339
 340 static int gpt_default(struct blk_desc *blk_dev_desc, const char *str_part)
 341 {
 342         int ret;
 343         char *str_disk_guid;
 344         u8 part_count = 0;
 345         disk_partition_t *partitions = NULL;
 346
 347         /* fill partitions */
 348         ret = set_gpt_info(blk_dev_desc, str_part,
 349                         &str_disk_guid, &partitions, &part_count);
 350         if (ret) {
 351                 if (ret == -1)
 352                         printf("No partition list provided\n");
 353                 if (ret == -2)
 354                         printf("Missing disk guid\n");
 355                 if ((ret == -3) || (ret == -4))
 356                         printf("Partition list incomplete\n");
 357                 return -1;
 358         }
 359
 360         /* save partitions layout to disk */
 361         ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
 362         free(str_disk_guid);
 363         free(partitions);
 364
 365         return ret;
 366 }
 367
 368 static int gpt_verify(struct blk_desc *blk_dev_desc, const char *str_part)
 369 {
 370         ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1,
 371                                      blk_dev_desc->blksz);
 372         disk_partition_t *partitions = NULL;
 373         gpt_entry *gpt_pte = NULL;
 374         char *str_disk_guid;
 375         u8 part_count = 0;
 376         int ret = 0;
 377
 378         /* fill partitions */
 379         ret = set_gpt_info(blk_dev_desc, str_part,
 380                         &str_disk_guid, &partitions, &part_count);
 381         if (ret) {
 382                 if (ret == -1) {
 383                         printf("No partition list provided - only basic check\n");
 384                         ret = gpt_verify_headers(blk_dev_desc, gpt_head,
 385                                                  &gpt_pte);
 386                         goto out;
 387                 }
 388                 if (ret == -2)
 389                         printf("Missing disk guid\n");
 390                 if ((ret == -3) || (ret == -4))
 391                         printf("Partition list incomplete\n");
 392                 return -1;
 393         }
 394
 395         /* Check partition layout with provided pattern */
 396         ret = gpt_verify_partitions(blk_dev_desc, partitions, part_count,
 397                                     gpt_head, &gpt_pte);
 398         free(str_disk_guid);
 399         free(partitions);
 400  out:
 401         free(gpt_pte);
 402         return ret;
 403 }
 404
 405 /**
 406  * do_gpt(): Perform GPT operations
 407  *
 408  * @param cmdtp - command name
 409  * @param flag
 410  * @param argc
 411  * @param argv
 412  *
 413  * @return zero on success; otherwise error
 414  */
 415 static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 416 {
 417         int ret = CMD_RET_SUCCESS;
 418         int dev = 0;
 419         char *ep;
 420         struct blk_desc *blk_dev_desc = NULL;
 421
 422         if (argc < 4 || argc > 5)
 423                 return CMD_RET_USAGE;
 424
 425         dev = (int)simple_strtoul(argv[3], &ep, 10);
 426         if (!ep || ep[0] != '\0') {
 427                 printf("'%s' is not a number\n", argv[3]);
 428                 return CMD_RET_USAGE;
 429         }
 430         blk_dev_desc = blk_get_dev(argv[2], dev);
 431         if (!blk_dev_desc) {
 432                 printf("%s: %s dev %d NOT available\n",
 433                        __func__, argv[2], dev);
 434                 return CMD_RET_FAILURE;
 435         }
 436
 437         if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
 438                 printf("Writing GPT: ");
 439                 ret = gpt_default(blk_dev_desc, argv[4]);
 440         } else if ((strcmp(argv[1], "verify") == 0)) {
 441                 ret = gpt_verify(blk_dev_desc, argv[4]);
 442                 printf("Verify GPT: ");
 443         } else {
 444                 return CMD_RET_USAGE;
 445         }
 446
 447         if (ret) {
 448                 printf("error!\n");
 449                 return CMD_RET_FAILURE;
 450         }
 451
 452         printf("success!\n");
 453         return CMD_RET_SUCCESS;
 454 }
 455
 456 U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
 457         "GUID Partition Table",
 458         "<command> <interface> <dev> <partitions_list>\n"
 459         " - GUID partition table restoration and validity check\n"
 460         " Restore or verify GPT information on a device connected\n"
 461         " to interface\n"
 462         " Example usage:\n"
 463         " gpt write mmc 0 $partitions\n"
 464         " gpt verify mmc 0 $partitions\n"
 465 );