cmd/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(block_dev_desc_t *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
 185         debug("%s:  lba num: 0x%x %d\n", __func__,
 186               (unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
 187
 188         if (str_part == NULL)
 189                 return -1;
 190
 191         str = strdup(str_part);
 192
 193         /* extract disk guid */
 194         s = str;
 195         val = extract_val(str, "uuid_disk");
 196         if (!val) {
 197 #ifdef CONFIG_RANDOM_UUID
 198                 *str_disk_guid = malloc(UUID_STR_LEN + 1);
 199                 gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
 200 #else
 201                 free(str);
 202                 return -2;
 203 #endif
 204         } else {
 205                 val = strsep(&val, ";");
 206                 if (extract_env(val, &p))
 207                         p = val;
 208                 *str_disk_guid = strdup(p);
 209                 free(val);
 210                 /* Move s to first partition */
 211                 strsep(&s, ";");
 212         }
 213         if (strlen(s) == 0)
 214                 return -3;
 215
 216         i = strlen(s) - 1;
 217         if (s[i] == ';')
 218                 s[i] = '\0';
 219
 220         /* calculate expected number of partitions */
 221         p_count = 1;
 222         p = s;
 223         while (*p) {
 224                 if (*p++ == ';')
 225                         p_count++;
 226         }
 227
 228         /* allocate memory for partitions */
 229         parts = calloc(sizeof(disk_partition_t), p_count);
 230
 231         /* retrieve partitions data from string */
 232         for (i = 0; i < p_count; i++) {
 233                 tok = strsep(&s, ";");
 234
 235                 if (tok == NULL)
 236                         break;
 237
 238                 /* uuid */
 239                 val = extract_val(tok, "uuid");
 240                 if (!val) {
 241                         /* 'uuid' is optional if random uuid's are enabled */
 242 #ifdef CONFIG_RANDOM_UUID
 243                         gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
 244 #else
 245                         errno = -4;
 246                         goto err;
 247 #endif
 248                 } else {
 249                         if (extract_env(val, &p))
 250                                 p = val;
 251                         if (strlen(p) >= sizeof(parts[i].uuid)) {
 252                                 printf("Wrong uuid format for partition %d\n", i);
 253                                 errno = -4;
 254                                 goto err;
 255                         }
 256                         strcpy((char *)parts[i].uuid, p);
 257                         free(val);
 258                 }
 259 #ifdef CONFIG_PARTITION_TYPE_GUID
 260                 /* guid */
 261                 val = extract_val(tok, "type");
 262                 if (val) {
 263                         /* 'type' is optional */
 264                         if (extract_env(val, &p))
 265                                 p = val;
 266                         if (strlen(p) >= sizeof(parts[i].type_guid)) {
 267                                 printf("Wrong type guid format for partition %d\n",
 268                                        i);
 269                                 errno = -4;
 270                                 goto err;
 271                         }
 272                         strcpy((char *)parts[i].type_guid, p);
 273                         free(val);
 274                 }
 275 #endif
 276                 /* name */
 277                 val = extract_val(tok, "name");
 278                 if (!val) { /* name is mandatory */
 279                         errno = -4;
 280                         goto err;
 281                 }
 282                 if (extract_env(val, &p))
 283                         p = val;
 284                 if (strlen(p) >= sizeof(parts[i].name)) {
 285                         errno = -4;
 286                         goto err;
 287                 }
 288                 strcpy((char *)parts[i].name, p);
 289                 free(val);
 290
 291                 /* size */
 292                 val = extract_val(tok, "size");
 293                 if (!val) { /* 'size' is mandatory */
 294                         errno = -4;
 295                         goto err;
 296                 }
 297                 if (extract_env(val, &p))
 298                         p = val;
 299                 size_ll = ustrtoull(p, &p, 0);
 300                 parts[i].size = lldiv(size_ll, dev_desc->blksz);
 301                 free(val);
 302
 303                 /* start address */
 304                 val = extract_val(tok, "start");
 305                 if (val) { /* start address is optional */
 306                         if (extract_env(val, &p))
 307                                 p = val;
 308                         start_ll = ustrtoull(p, &p, 0);
 309                         parts[i].start = lldiv(start_ll, dev_desc->blksz);
 310                         free(val);
 311                 }
 312
 313                 /* bootable */
 314                 if (found_key(tok, "bootable"))
 315                         parts[i].bootable = 1;
 316         }
 317
 318         *parts_count = p_count;
 319         *partitions = parts;
 320         free(str);
 321
 322         return 0;
 323 err:
 324         free(str);
 325         free(*str_disk_guid);
 326         free(parts);
 327
 328         return errno;
 329 }
 330
 331 static int gpt_default(block_dev_desc_t *blk_dev_desc, const char *str_part)
 332 {
 333         int ret;
 334         char *str_disk_guid;
 335         u8 part_count = 0;
 336         disk_partition_t *partitions = NULL;
 337
 338         /* fill partitions */
 339         ret = set_gpt_info(blk_dev_desc, str_part,
 340                         &str_disk_guid, &partitions, &part_count);
 341         if (ret) {
 342                 if (ret == -1)
 343                         printf("No partition list provided\n");
 344                 if (ret == -2)
 345                         printf("Missing disk guid\n");
 346                 if ((ret == -3) || (ret == -4))
 347                         printf("Partition list incomplete\n");
 348                 return -1;
 349         }
 350
 351         /* save partitions layout to disk */
 352         ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
 353         free(str_disk_guid);
 354         free(partitions);
 355
 356         return ret;
 357 }
 358
 359 static int gpt_verify(block_dev_desc_t *blk_dev_desc, const char *str_part)
 360 {
 361         ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1,
 362                                      blk_dev_desc->blksz);
 363         disk_partition_t *partitions = NULL;
 364         gpt_entry *gpt_pte = NULL;
 365         char *str_disk_guid;
 366         u8 part_count = 0;
 367         int ret = 0;
 368
 369         /* fill partitions */
 370         ret = set_gpt_info(blk_dev_desc, str_part,
 371                         &str_disk_guid, &partitions, &part_count);
 372         if (ret) {
 373                 if (ret == -1) {
 374                         printf("No partition list provided - only basic check\n");
 375                         ret = gpt_verify_headers(blk_dev_desc, gpt_head,
 376                                                  &gpt_pte);
 377                         goto out;
 378                 }
 379                 if (ret == -2)
 380                         printf("Missing disk guid\n");
 381                 if ((ret == -3) || (ret == -4))
 382                         printf("Partition list incomplete\n");
 383                 return -1;
 384         }
 385
 386         /* Check partition layout with provided pattern */
 387         ret = gpt_verify_partitions(blk_dev_desc, partitions, part_count,
 388                                     gpt_head, &gpt_pte);
 389         free(str_disk_guid);
 390         free(partitions);
 391  out:
 392         free(gpt_pte);
 393         return ret;
 394 }
 395
 396 /**
 397  * do_gpt(): Perform GPT operations
 398  *
 399  * @param cmdtp - command name
 400  * @param flag
 401  * @param argc
 402  * @param argv
 403  *
 404  * @return zero on success; otherwise error
 405  */
 406 static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 407 {
 408         int ret = CMD_RET_SUCCESS;
 409         int dev = 0;
 410         char *ep;
 411         block_dev_desc_t *blk_dev_desc = NULL;
 412
 413         if (argc < 4 || argc > 5)
 414                 return CMD_RET_USAGE;
 415
 416         dev = (int)simple_strtoul(argv[3], &ep, 10);
 417         if (!ep || ep[0] != '\0') {
 418                 printf("'%s' is not a number\n", argv[3]);
 419                 return CMD_RET_USAGE;
 420         }
 421         blk_dev_desc = get_dev(argv[2], dev);
 422         if (!blk_dev_desc) {
 423                 printf("%s: %s dev %d NOT available\n",
 424                        __func__, argv[2], dev);
 425                 return CMD_RET_FAILURE;
 426         }
 427
 428         if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
 429                 printf("Writing GPT: ");
 430                 ret = gpt_default(blk_dev_desc, argv[4]);
 431         } else if ((strcmp(argv[1], "verify") == 0)) {
 432                 ret = gpt_verify(blk_dev_desc, argv[4]);
 433                 printf("Verify GPT: ");
 434         } else {
 435                 return CMD_RET_USAGE;
 436         }
 437
 438         if (ret) {
 439                 printf("error!\n");
 440                 return CMD_RET_FAILURE;
 441         }
 442
 443         printf("success!\n");
 444         return CMD_RET_SUCCESS;
 445 }
 446
 447 U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
 448         "GUID Partition Table",
 449         "<command> <interface> <dev> <partitions_list>\n"
 450         " - GUID partition table restoration and validity check\n"
 451         " Restore or verify GPT information on a device connected\n"
 452         " to interface\n"
 453         " Example usage:\n"
 454         " gpt write mmc 0 $partitions\n"
 455         " gpt verify mmc 0 $partitions\n"
 456 );