tools/env/fw_env.c

   1 /*
   2  * (C) Copyright 2000-2010
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2008
   6  * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.de.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #define _GNU_SOURCE
  12
  13 #include <compiler.h>
  14 #include <errno.h>
  15 #include <env_flags.h>
  16 #include <fcntl.h>
  17 #include <linux/fs.h>
  18 #include <linux/stringify.h>
  19 #include <ctype.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <stddef.h>
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <sys/ioctl.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28
  29 #ifdef MTD_OLD
  30 # include <stdint.h>
  31 # include <linux/mtd/mtd.h>
  32 #else
  33 # define  __user        /* nothing */
  34 # include <mtd/mtd-user.h>
  35 #endif
  36
  37 #include "fw_env.h"
  38
  39 struct env_opts default_opts = {
  40 #ifdef CONFIG_FILE
  41         .config_file = CONFIG_FILE
  42 #endif
  43 };
  44
  45 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
  46
  47 #define min(x, y) ({                            \
  48         typeof(x) _min1 = (x);                  \
  49         typeof(y) _min2 = (y);                  \
  50         (void) (&_min1 == &_min2);              \
  51         _min1 < _min2 ? _min1 : _min2; })
  52
  53 struct envdev_s {
  54         const char *devname;            /* Device name */
  55         long long devoff;               /* Device offset */
  56         ulong env_size;                 /* environment size */
  57         ulong erase_size;               /* device erase size */
  58         ulong env_sectors;              /* number of environment sectors */
  59         uint8_t mtd_type;               /* type of the MTD device */
  60 };
  61
  62 static struct envdev_s envdevices[2] =
  63 {
  64         {
  65                 .mtd_type = MTD_ABSENT,
  66         }, {
  67                 .mtd_type = MTD_ABSENT,
  68         },
  69 };
  70 static int dev_current;
  71
  72 #define DEVNAME(i)    envdevices[(i)].devname
  73 #define DEVOFFSET(i)  envdevices[(i)].devoff
  74 #define ENVSIZE(i)    envdevices[(i)].env_size
  75 #define DEVESIZE(i)   envdevices[(i)].erase_size
  76 #define ENVSECTORS(i) envdevices[(i)].env_sectors
  77 #define DEVTYPE(i)    envdevices[(i)].mtd_type
  78
  79 #define CUR_ENVSIZE ENVSIZE(dev_current)
  80
  81 static unsigned long usable_envsize;
  82 #define ENV_SIZE      usable_envsize
  83
  84 struct env_image_single {
  85         uint32_t        crc;    /* CRC32 over data bytes    */
  86         char            data[];
  87 };
  88
  89 struct env_image_redundant {
  90         uint32_t        crc;    /* CRC32 over data bytes    */
  91         unsigned char   flags;  /* active or obsolete */
  92         char            data[];
  93 };
  94
  95 enum flag_scheme {
  96         FLAG_NONE,
  97         FLAG_BOOLEAN,
  98         FLAG_INCREMENTAL,
  99 };
 100
 101 struct environment {
 102         void                    *image;
 103         uint32_t                *crc;
 104         unsigned char           *flags;
 105         char                    *data;
 106         enum flag_scheme        flag_scheme;
 107 };
 108
 109 static struct environment environment = {
 110         .flag_scheme = FLAG_NONE,
 111 };
 112
 113 static int env_aes_cbc_crypt(char *data, const int enc, uint8_t *key);
 114
 115 static int HaveRedundEnv = 0;
 116
 117 static unsigned char active_flag = 1;
 118 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
 119 static unsigned char obsolete_flag = 0;
 120
 121 #define DEFAULT_ENV_INSTANCE_STATIC
 122 #include <env_default.h>
 123
 124 static int flash_io (int mode);
 125 static int parse_config(struct env_opts *opts);
 126
 127 #if defined(CONFIG_FILE)
 128 static int get_config (char *);
 129 #endif
 130
 131 static char *skip_chars(char *s)
 132 {
 133         for (; *s != '\0'; s++) {
 134                 if (isblank(*s))
 135                         return s;
 136         }
 137         return NULL;
 138 }
 139
 140 static char *skip_blanks(char *s)
 141 {
 142         for (; *s != '\0'; s++) {
 143                 if (!isblank(*s))
 144                         return s;
 145         }
 146         return NULL;
 147 }
 148
 149 /*
 150  * s1 is either a simple 'name', or a 'name=value' pair.
 151  * s2 is a 'name=value' pair.
 152  * If the names match, return the value of s2, else NULL.
 153  */
 154 static char *envmatch(char *s1, char *s2)
 155 {
 156         if (s1 == NULL || s2 == NULL)
 157                 return NULL;
 158
 159         while (*s1 == *s2++)
 160                 if (*s1++ == '=')
 161                         return s2;
 162         if (*s1 == '\0' && *(s2 - 1) == '=')
 163                 return s2;
 164         return NULL;
 165 }
 166
 167 /**
 168  * Search the environment for a variable.
 169  * Return the value, if found, or NULL, if not found.
 170  */
 171 char *fw_getenv (char *name)
 172 {
 173         char *env, *nxt;
 174
 175         for (env = environment.data; *env; env = nxt + 1) {
 176                 char *val;
 177
 178                 for (nxt = env; *nxt; ++nxt) {
 179                         if (nxt >= &environment.data[ENV_SIZE]) {
 180                                 fprintf (stderr, "## Error: "
 181                                         "environment not terminated\n");
 182                                 return NULL;
 183                         }
 184                 }
 185                 val = envmatch (name, env);
 186                 if (!val)
 187                         continue;
 188                 return val;
 189         }
 190         return NULL;
 191 }
 192
 193 /*
 194  * Search the default environment for a variable.
 195  * Return the value, if found, or NULL, if not found.
 196  */
 197 char *fw_getdefenv(char *name)
 198 {
 199         char *env, *nxt;
 200
 201         for (env = default_environment; *env; env = nxt + 1) {
 202                 char *val;
 203
 204                 for (nxt = env; *nxt; ++nxt) {
 205                         if (nxt >= &default_environment[ENV_SIZE]) {
 206                                 fprintf(stderr, "## Error: "
 207                                         "default environment not terminated\n");
 208                                 return NULL;
 209                         }
 210                 }
 211                 val = envmatch(name, env);
 212                 if (!val)
 213                         continue;
 214                 return val;
 215         }
 216         return NULL;
 217 }
 218
 219 int parse_aes_key(char *key, uint8_t *bin_key)
 220 {
 221         char tmp[5] = { '0', 'x', 0, 0, 0 };
 222         unsigned long ul;
 223         int i;
 224
 225         if (strnlen(key, 64) != 32) {
 226                 fprintf(stderr,
 227                         "## Error: '-a' option requires 16-byte AES key\n");
 228                 return -1;
 229         }
 230
 231         for (i = 0; i < 16; i++) {
 232                 tmp[2] = key[0];
 233                 tmp[3] = key[1];
 234                 errno = 0;
 235                 ul = strtoul(tmp, NULL, 16);
 236                 if (errno) {
 237                         fprintf(stderr,
 238                                 "## Error: '-a' option requires valid AES key\n");
 239                         return -1;
 240                 }
 241                 bin_key[i] = ul & 0xff;
 242                 key += 2;
 243         }
 244         return 0;
 245 }
 246
 247 /*
 248  * Print the current definition of one, or more, or all
 249  * environment variables
 250  */
 251 int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts)
 252 {
 253         int i, rc = 0;
 254
 255         if (value_only && argc != 1) {
 256                 fprintf(stderr,
 257                         "## Error: `-n' option requires exactly one argument\n");
 258                 return -1;
 259         }
 260
 261         if (!opts)
 262                 opts = &default_opts;
 263
 264         if (fw_env_open(opts))
 265                 return -1;
 266
 267         if (argc == 0) {                /* Print all env variables  */
 268                 char *env, *nxt;
 269                 for (env = environment.data; *env; env = nxt + 1) {
 270                         for (nxt = env; *nxt; ++nxt) {
 271                                 if (nxt >= &environment.data[ENV_SIZE]) {
 272                                         fprintf (stderr, "## Error: "
 273                                                 "environment not terminated\n");
 274                                         return -1;
 275                                 }
 276                         }
 277
 278                         printf ("%s\n", env);
 279                 }
 280                 return 0;
 281         }
 282
 283         for (i = 0; i < argc; ++i) {    /* print a subset of env variables */
 284                 char *name = argv[i];
 285                 char *val = NULL;
 286
 287                 val = fw_getenv(name);
 288                 if (!val) {
 289                         fprintf (stderr, "## Error: \"%s\" not defined\n", name);
 290                         rc = -1;
 291                         continue;
 292                 }
 293
 294                 if (value_only) {
 295                         puts(val);
 296                         break;
 297                 }
 298
 299                 printf("%s=%s\n", name, val);
 300         }
 301
 302         return rc;
 303 }
 304
 305 int fw_env_close(struct env_opts *opts)
 306 {
 307         int ret;
 308
 309         if (!opts)
 310                 opts = &default_opts;
 311
 312         if (opts->aes_flag) {
 313                 ret = env_aes_cbc_crypt(environment.data, 1,
 314                                         opts->aes_key);
 315                 if (ret) {
 316                         fprintf(stderr,
 317                                 "Error: can't encrypt env for flash\n");
 318                         return ret;
 319                 }
 320         }
 321
 322         /*
 323          * Update CRC
 324          */
 325         *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
 326
 327         /* write environment back to flash */
 328         if (flash_io(O_RDWR)) {
 329                 fprintf(stderr,
 330                         "Error: can't write fw_env to flash\n");
 331                         return -1;
 332         }
 333
 334         return 0;
 335 }
 336
 337
 338 /*
 339  * Set/Clear a single variable in the environment.
 340  * This is called in sequence to update the environment
 341  * in RAM without updating the copy in flash after each set
 342  */
 343 int fw_env_write(char *name, char *value)
 344 {
 345         int len;
 346         char *env, *nxt;
 347         char *oldval = NULL;
 348         int deleting, creating, overwriting;
 349
 350         /*
 351          * search if variable with this name already exists
 352          */
 353         for (nxt = env = environment.data; *env; env = nxt + 1) {
 354                 for (nxt = env; *nxt; ++nxt) {
 355                         if (nxt >= &environment.data[ENV_SIZE]) {
 356                                 fprintf(stderr, "## Error: "
 357                                         "environment not terminated\n");
 358                                 errno = EINVAL;
 359                                 return -1;
 360                         }
 361                 }
 362                 if ((oldval = envmatch (name, env)) != NULL)
 363                         break;
 364         }
 365
 366         deleting = (oldval && !(value && strlen(value)));
 367         creating = (!oldval && (value && strlen(value)));
 368         overwriting = (oldval && (value && strlen(value)));
 369
 370         /* check for permission */
 371         if (deleting) {
 372                 if (env_flags_validate_varaccess(name,
 373                     ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
 374                         printf("Can't delete \"%s\"\n", name);
 375                         errno = EROFS;
 376                         return -1;
 377                 }
 378         } else if (overwriting) {
 379                 if (env_flags_validate_varaccess(name,
 380                     ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
 381                         printf("Can't overwrite \"%s\"\n", name);
 382                         errno = EROFS;
 383                         return -1;
 384                 } else if (env_flags_validate_varaccess(name,
 385                     ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
 386                         const char *defval = fw_getdefenv(name);
 387
 388                         if (defval == NULL)
 389                                 defval = "";
 390                         if (strcmp(oldval, defval)
 391                             != 0) {
 392                                 printf("Can't overwrite \"%s\"\n", name);
 393                                 errno = EROFS;
 394                                 return -1;
 395                         }
 396                 }
 397         } else if (creating) {
 398                 if (env_flags_validate_varaccess(name,
 399                     ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
 400                         printf("Can't create \"%s\"\n", name);
 401                         errno = EROFS;
 402                         return -1;
 403                 }
 404         } else
 405                 /* Nothing to do */
 406                 return 0;
 407
 408         if (deleting || overwriting) {
 409                 if (*++nxt == '\0') {
 410                         *env = '\0';
 411                 } else {
 412                         for (;;) {
 413                                 *env = *nxt++;
 414                                 if ((*env == '\0') && (*nxt == '\0'))
 415                                         break;
 416                                 ++env;
 417                         }
 418                 }
 419                 *++env = '\0';
 420         }
 421
 422         /* Delete only ? */
 423         if (!value || !strlen(value))
 424                 return 0;
 425
 426         /*
 427          * Append new definition at the end
 428          */
 429         for (env = environment.data; *env || *(env + 1); ++env);
 430         if (env > environment.data)
 431                 ++env;
 432         /*
 433          * Overflow when:
 434          * "name" + "=" + "val" +"\0\0"  > CUR_ENVSIZE - (env-environment)
 435          */
 436         len = strlen (name) + 2;
 437         /* add '=' for first arg, ' ' for all others */
 438         len += strlen(value) + 1;
 439
 440         if (len > (&environment.data[ENV_SIZE] - env)) {
 441                 fprintf (stderr,
 442                         "Error: environment overflow, \"%s\" deleted\n",
 443                         name);
 444                 return -1;
 445         }
 446
 447         while ((*env = *name++) != '\0')
 448                 env++;
 449         *env = '=';
 450         while ((*++env = *value++) != '\0')
 451                 ;
 452
 453         /* end is marked with double '\0' */
 454         *++env = '\0';
 455
 456         return 0;
 457 }
 458
 459 /*
 460  * Deletes or sets environment variables. Returns -1 and sets errno error codes:
 461  * 0      - OK
 462  * EINVAL - need at least 1 argument
 463  * EROFS  - certain variables ("ethaddr", "serial#") cannot be
 464  *          modified or deleted
 465  *
 466  */
 467 int fw_setenv(int argc, char *argv[], struct env_opts *opts)
 468 {
 469         int i;
 470         size_t len;
 471         char *name, **valv;
 472         char *value = NULL;
 473         int valc;
 474
 475         if (!opts)
 476                 opts = &default_opts;
 477
 478         if (argc < 1) {
 479                 fprintf(stderr, "## Error: variable name missing\n");
 480                 errno = EINVAL;
 481                 return -1;
 482         }
 483
 484         if (fw_env_open(opts)) {
 485                 fprintf(stderr, "Error: environment not initialized\n");
 486                 return -1;
 487         }
 488
 489         name = argv[0];
 490         valv = argv + 1;
 491         valc = argc - 1;
 492
 493         if (env_flags_validate_env_set_params(name, valv, valc) < 0)
 494                 return -1;
 495
 496         len = 0;
 497         for (i = 0; i < valc; ++i) {
 498                 char *val = valv[i];
 499                 size_t val_len = strlen(val);
 500
 501                 if (value)
 502                         value[len - 1] = ' ';
 503                 value = realloc(value, len + val_len + 1);
 504                 if (!value) {
 505                         fprintf(stderr,
 506                                 "Cannot malloc %zu bytes: %s\n",
 507                                 len, strerror(errno));
 508                         return -1;
 509                 }
 510
 511                 memcpy(value + len, val, val_len);
 512                 len += val_len;
 513                 value[len++] = '\0';
 514         }
 515
 516         fw_env_write(name, value);
 517
 518         free(value);
 519
 520         return fw_env_close(opts);
 521 }
 522
 523 /*
 524  * Parse  a file  and configure the u-boot variables.
 525  * The script file has a very simple format, as follows:
 526  *
 527  * Each line has a couple with name, value:
 528  * <white spaces>variable_name<white spaces>variable_value
 529  *
 530  * Both variable_name and variable_value are interpreted as strings.
 531  * Any character after <white spaces> and before ending \r\n is interpreted
 532  * as variable's value (no comment allowed on these lines !)
 533  *
 534  * Comments are allowed if the first character in the line is #
 535  *
 536  * Returns -1 and sets errno error codes:
 537  * 0      - OK
 538  * -1     - Error
 539  */
 540 int fw_parse_script(char *fname, struct env_opts *opts)
 541 {
 542         FILE *fp;
 543         char dump[1024];        /* Maximum line length in the file */
 544         char *name;
 545         char *val;
 546         int lineno = 0;
 547         int len;
 548         int ret = 0;
 549
 550         if (!opts)
 551                 opts = &default_opts;
 552
 553         if (fw_env_open(opts)) {
 554                 fprintf(stderr, "Error: environment not initialized\n");
 555                 return -1;
 556         }
 557
 558         if (strcmp(fname, "-") == 0)
 559                 fp = stdin;
 560         else {
 561                 fp = fopen(fname, "r");
 562                 if (fp == NULL) {
 563                         fprintf(stderr, "I cannot open %s for reading\n",
 564                                  fname);
 565                         return -1;
 566                 }
 567         }
 568
 569         while (fgets(dump, sizeof(dump), fp)) {
 570                 lineno++;
 571                 len = strlen(dump);
 572
 573                 /*
 574                  * Read a whole line from the file. If the line is too long
 575                  * or is not terminated, reports an error and exit.
 576                  */
 577                 if (dump[len - 1] != '\n') {
 578                         fprintf(stderr,
 579                         "Line %d not corrected terminated or too long\n",
 580                                 lineno);
 581                         ret = -1;
 582                         break;
 583                 }
 584
 585                 /* Drop ending line feed / carriage return */
 586                 dump[--len] = '\0';
 587                 if (len && dump[len - 1] == '\r')
 588                         dump[--len] = '\0';
 589
 590                 /* Skip comment or empty lines */
 591                 if (len == 0 || dump[0] == '#')
 592                         continue;
 593
 594                 /*
 595                  * Search for variable's name,
 596                  * remove leading whitespaces
 597                  */
 598                 name = skip_blanks(dump);
 599                 if (!name)
 600                         continue;
 601
 602                 /* The first white space is the end of variable name */
 603                 val = skip_chars(name);
 604                 len = strlen(name);
 605                 if (val) {
 606                         *val++ = '\0';
 607                         if ((val - name) < len)
 608                                 val = skip_blanks(val);
 609                         else
 610                                 val = NULL;
 611                 }
 612
 613 #ifdef DEBUG
 614                 fprintf(stderr, "Setting %s : %s\n",
 615                         name, val ? val : " removed");
 616 #endif
 617
 618                 if (env_flags_validate_type(name, val) < 0) {
 619                         ret = -1;
 620                         break;
 621                 }
 622
 623                 /*
 624                  * If there is an error setting a variable,
 625                  * try to save the environment and returns an error
 626                  */
 627                 if (fw_env_write(name, val)) {
 628                         fprintf(stderr,
 629                         "fw_env_write returns with error : %s\n",
 630                                 strerror(errno));
 631                         ret = -1;
 632                         break;
 633                 }
 634
 635         }
 636
 637         /* Close file if not stdin */
 638         if (strcmp(fname, "-") != 0)
 639                 fclose(fp);
 640
 641         ret |= fw_env_close(opts);
 642
 643         return ret;
 644 }
 645
 646 /**
 647  * environment_end() - compute offset of first byte right after environemnt
 648  * @dev - index of enviroment buffer
 649  * Return:
 650  *  device offset of first byte right after environemnt
 651  */
 652 off_t environment_end(int dev)
 653 {
 654         /* environment is block aligned */
 655         return DEVOFFSET(dev) + ENVSECTORS(dev) * DEVESIZE(dev);
 656 }
 657
 658 /*
 659  * Test for bad block on NAND, just returns 0 on NOR, on NAND:
 660  * 0    - block is good
 661  * > 0  - block is bad
 662  * < 0  - failed to test
 663  */
 664 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t blockstart)
 665 {
 666         if (mtd_type == MTD_NANDFLASH) {
 667                 int badblock = ioctl(fd, MEMGETBADBLOCK, &blockstart);
 668
 669                 if (badblock < 0) {
 670                         perror ("Cannot read bad block mark");
 671                         return badblock;
 672                 }
 673
 674                 if (badblock) {
 675 #ifdef DEBUG
 676                         fprintf (stderr, "Bad block at 0x%llx, skipping\n",
 677                                 (unsigned long long)blockstart);
 678 #endif
 679                         return badblock;
 680                 }
 681         }
 682
 683         return 0;
 684 }
 685
 686 /*
 687  * Read data from flash at an offset into a provided buffer. On NAND it skips
 688  * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
 689  * the DEVOFFSET (dev) block. On NOR the loop is only run once.
 690  */
 691 static int flash_read_buf (int dev, int fd, void *buf, size_t count,
 692                            off_t offset)
 693 {
 694         size_t blocklen;        /* erase / write length - one block on NAND,
 695                                    0 on NOR */
 696         size_t processed = 0;   /* progress counter */
 697         size_t readlen = count; /* current read length */
 698         off_t block_seek;       /* offset inside the current block to the start
 699                                    of the data */
 700         loff_t blockstart;      /* running start of the current block -
 701                                    MEMGETBADBLOCK needs 64 bits */
 702         int rc;
 703
 704         blockstart = (offset / DEVESIZE (dev)) * DEVESIZE (dev);
 705
 706         /* Offset inside a block */
 707         block_seek = offset - blockstart;
 708
 709         if (DEVTYPE(dev) == MTD_NANDFLASH) {
 710                 /*
 711                  * NAND: calculate which blocks we are reading. We have
 712                  * to read one block at a time to skip bad blocks.
 713                  */
 714                 blocklen = DEVESIZE (dev);
 715
 716                 /* Limit to one block for the first read */
 717                 if (readlen > blocklen - block_seek)
 718                         readlen = blocklen - block_seek;
 719         } else {
 720                 blocklen = 0;
 721         }
 722
 723         /* This only runs once on NOR flash */
 724         while (processed < count) {
 725                 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
 726                 if (rc < 0)             /* block test failed */
 727                         return -1;
 728
 729                 if (blockstart + block_seek + readlen > environment_end(dev)) {
 730                         /* End of range is reached */
 731                         fprintf (stderr,
 732                                  "Too few good blocks within range\n");
 733                         return -1;
 734                 }
 735
 736                 if (rc) {               /* block is bad */
 737                         blockstart += blocklen;
 738                         continue;
 739                 }
 740
 741                 /*
 742                  * If a block is bad, we retry in the next block at the same
 743                  * offset - see common/env_nand.c::writeenv()
 744                  */
 745                 lseek (fd, blockstart + block_seek, SEEK_SET);
 746
 747                 rc = read (fd, buf + processed, readlen);
 748                 if (rc != readlen) {
 749                         fprintf (stderr, "Read error on %s: %s\n",
 750                                  DEVNAME (dev), strerror (errno));
 751                         return -1;
 752                 }
 753 #ifdef DEBUG
 754                 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
 755                         rc, (unsigned long long) blockstart + block_seek,
 756                         DEVNAME(dev));
 757 #endif
 758                 processed += readlen;
 759                 readlen = min (blocklen, count - processed);
 760                 block_seek = 0;
 761                 blockstart += blocklen;
 762         }
 763
 764         return processed;
 765 }
 766
 767 /*
 768  * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
 769  * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
 770  * erase and write the whole data at once.
 771  */
 772 static int flash_write_buf (int dev, int fd, void *buf, size_t count,
 773                             off_t offset)
 774 {
 775         void *data;
 776         struct erase_info_user erase;
 777         size_t blocklen;        /* length of NAND block / NOR erase sector */
 778         size_t erase_len;       /* whole area that can be erased - may include
 779                                    bad blocks */
 780         size_t erasesize;       /* erase / write length - one block on NAND,
 781                                    whole area on NOR */
 782         size_t processed = 0;   /* progress counter */
 783         size_t write_total;     /* total size to actually write - excluding
 784                                    bad blocks */
 785         off_t erase_offset;     /* offset to the first erase block (aligned)
 786                                    below offset */
 787         off_t block_seek;       /* offset inside the erase block to the start
 788                                    of the data */
 789         loff_t blockstart;      /* running start of the current block -
 790                                    MEMGETBADBLOCK needs 64 bits */
 791         int rc;
 792
 793         /*
 794          * For mtd devices only offset and size of the environment do matter
 795          */
 796         if (DEVTYPE(dev) == MTD_ABSENT) {
 797                 blocklen = count;
 798                 erase_len = blocklen;
 799                 blockstart = offset;
 800                 block_seek = 0;
 801                 write_total = blocklen;
 802         } else {
 803                 blocklen = DEVESIZE(dev);
 804
 805                 erase_offset = (offset / blocklen) * blocklen;
 806
 807                 /* Maximum area we may use */
 808                 erase_len = environment_end(dev) - erase_offset;
 809
 810                 blockstart = erase_offset;
 811                 /* Offset inside a block */
 812                 block_seek = offset - erase_offset;
 813
 814                 /*
 815                  * Data size we actually write: from the start of the block
 816                  * to the start of the data, then count bytes of data, and
 817                  * to the end of the block
 818                  */
 819                 write_total = ((block_seek + count + blocklen - 1) /
 820                                                         blocklen) * blocklen;
 821         }
 822
 823         /*
 824          * Support data anywhere within erase sectors: read out the complete
 825          * area to be erased, replace the environment image, write the whole
 826          * block back again.
 827          */
 828         if (write_total > count) {
 829                 data = malloc (erase_len);
 830                 if (!data) {
 831                         fprintf (stderr,
 832                                  "Cannot malloc %zu bytes: %s\n",
 833                                  erase_len, strerror (errno));
 834                         return -1;
 835                 }
 836
 837                 rc = flash_read_buf(dev, fd, data, write_total, erase_offset);
 838                 if (write_total != rc)
 839                         return -1;
 840
 841 #ifdef DEBUG
 842                 fprintf(stderr, "Preserving data ");
 843                 if (block_seek != 0)
 844                         fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
 845                 if (block_seek + count != write_total) {
 846                         if (block_seek != 0)
 847                                 fprintf(stderr, " and ");
 848                         fprintf(stderr, "0x%lx - 0x%lx",
 849                                 (unsigned long) block_seek + count,
 850                                 (unsigned long) write_total - 1);
 851                 }
 852                 fprintf(stderr, "\n");
 853 #endif
 854                 /* Overwrite the old environment */
 855                 memcpy (data + block_seek, buf, count);
 856         } else {
 857                 /*
 858                  * We get here, iff offset is block-aligned and count is a
 859                  * multiple of blocklen - see write_total calculation above
 860                  */
 861                 data = buf;
 862         }
 863
 864         if (DEVTYPE(dev) == MTD_NANDFLASH) {
 865                 /*
 866                  * NAND: calculate which blocks we are writing. We have
 867                  * to write one block at a time to skip bad blocks.
 868                  */
 869                 erasesize = blocklen;
 870         } else {
 871                 erasesize = erase_len;
 872         }
 873
 874         erase.length = erasesize;
 875
 876         /* This only runs once on NOR flash and SPI-dataflash */
 877         while (processed < write_total) {
 878                 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
 879                 if (rc < 0)             /* block test failed */
 880                         return rc;
 881
 882                 if (blockstart + erasesize > environment_end(dev)) {
 883                         fprintf (stderr, "End of range reached, aborting\n");
 884                         return -1;
 885                 }
 886
 887                 if (rc) {               /* block is bad */
 888                         blockstart += blocklen;
 889                         continue;
 890                 }
 891
 892                 if (DEVTYPE(dev) != MTD_ABSENT) {
 893                         erase.start = blockstart;
 894                         ioctl(fd, MEMUNLOCK, &erase);
 895                         /* These do not need an explicit erase cycle */
 896                         if (DEVTYPE(dev) != MTD_DATAFLASH)
 897                                 if (ioctl(fd, MEMERASE, &erase) != 0) {
 898                                         fprintf(stderr,
 899                                                 "MTD erase error on %s: %s\n",
 900                                                 DEVNAME(dev), strerror(errno));
 901                                         return -1;
 902                                 }
 903                 }
 904
 905                 if (lseek (fd, blockstart, SEEK_SET) == -1) {
 906                         fprintf (stderr,
 907                                  "Seek error on %s: %s\n",
 908                                  DEVNAME (dev), strerror (errno));
 909                         return -1;
 910                 }
 911
 912 #ifdef DEBUG
 913                 fprintf(stderr, "Write 0x%llx bytes at 0x%llx\n",
 914                         (unsigned long long) erasesize,
 915                         (unsigned long long) blockstart);
 916 #endif
 917                 if (write (fd, data + processed, erasesize) != erasesize) {
 918                         fprintf (stderr, "Write error on %s: %s\n",
 919                                  DEVNAME (dev), strerror (errno));
 920                         return -1;
 921                 }
 922
 923                 if (DEVTYPE(dev) != MTD_ABSENT)
 924                         ioctl(fd, MEMLOCK, &erase);
 925
 926                 processed  += erasesize;
 927                 block_seek = 0;
 928                 blockstart += erasesize;
 929         }
 930
 931         if (write_total > count)
 932                 free (data);
 933
 934         return processed;
 935 }
 936
 937 /*
 938  * Set obsolete flag at offset - NOR flash only
 939  */
 940 static int flash_flag_obsolete (int dev, int fd, off_t offset)
 941 {
 942         int rc;
 943         struct erase_info_user erase;
 944
 945         erase.start  = DEVOFFSET (dev);
 946         erase.length = DEVESIZE (dev);
 947         /* This relies on the fact, that obsolete_flag == 0 */
 948         rc = lseek (fd, offset, SEEK_SET);
 949         if (rc < 0) {
 950                 fprintf (stderr, "Cannot seek to set the flag on %s \n",
 951                          DEVNAME (dev));
 952                 return rc;
 953         }
 954         ioctl (fd, MEMUNLOCK, &erase);
 955         rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
 956         ioctl (fd, MEMLOCK, &erase);
 957         if (rc < 0)
 958                 perror ("Could not set obsolete flag");
 959
 960         return rc;
 961 }
 962
 963 /* Encrypt or decrypt the environment before writing or reading it. */
 964 static int env_aes_cbc_crypt(char *payload, const int enc, uint8_t *key)
 965 {
 966         uint8_t *data = (uint8_t *)payload;
 967         const int len = usable_envsize;
 968         uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
 969         uint32_t aes_blocks;
 970
 971         /* First we expand the key. */
 972         aes_expand_key(key, key_exp);
 973
 974         /* Calculate the number of AES blocks to encrypt. */
 975         aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
 976
 977         if (enc)
 978                 aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
 979         else
 980                 aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
 981
 982         return 0;
 983 }
 984
 985 static int flash_write (int fd_current, int fd_target, int dev_target)
 986 {
 987         int rc;
 988
 989         switch (environment.flag_scheme) {
 990         case FLAG_NONE:
 991                 break;
 992         case FLAG_INCREMENTAL:
 993                 (*environment.flags)++;
 994                 break;
 995         case FLAG_BOOLEAN:
 996                 *environment.flags = active_flag;
 997                 break;
 998         default:
 999                 fprintf (stderr, "Unimplemented flash scheme %u \n",
1000                          environment.flag_scheme);
1001                 return -1;
1002         }
1003
1004 #ifdef DEBUG
1005         fprintf(stderr, "Writing new environment at 0x%llx on %s\n",
1006                 DEVOFFSET (dev_target), DEVNAME (dev_target));
1007 #endif
1008
1009         rc = flash_write_buf(dev_target, fd_target, environment.image,
1010                              CUR_ENVSIZE, DEVOFFSET(dev_target));
1011         if (rc < 0)
1012                 return rc;
1013
1014         if (environment.flag_scheme == FLAG_BOOLEAN) {
1015                 /* Have to set obsolete flag */
1016                 off_t offset = DEVOFFSET (dev_current) +
1017                         offsetof (struct env_image_redundant, flags);
1018 #ifdef DEBUG
1019                 fprintf(stderr,
1020                         "Setting obsolete flag in environment at 0x%llx on %s\n",
1021                         DEVOFFSET (dev_current), DEVNAME (dev_current));
1022 #endif
1023                 flash_flag_obsolete (dev_current, fd_current, offset);
1024         }
1025
1026         return 0;
1027 }
1028
1029 static int flash_read (int fd)
1030 {
1031         int rc;
1032
1033         rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1034                             DEVOFFSET(dev_current));
1035         if (rc != CUR_ENVSIZE)
1036                 return -1;
1037
1038         return 0;
1039 }
1040
1041 static int flash_io (int mode)
1042 {
1043         int fd_current, fd_target, rc, dev_target;
1044
1045         /* dev_current: fd_current, erase_current */
1046         fd_current = open (DEVNAME (dev_current), mode);
1047         if (fd_current < 0) {
1048                 fprintf (stderr,
1049                          "Can't open %s: %s\n",
1050                          DEVNAME (dev_current), strerror (errno));
1051                 return -1;
1052         }
1053
1054         if (mode == O_RDWR) {
1055                 if (HaveRedundEnv) {
1056                         /* switch to next partition for writing */
1057                         dev_target = !dev_current;
1058                         /* dev_target: fd_target, erase_target */
1059                         fd_target = open (DEVNAME (dev_target), mode);
1060                         if (fd_target < 0) {
1061                                 fprintf (stderr,
1062                                          "Can't open %s: %s\n",
1063                                          DEVNAME (dev_target),
1064                                          strerror (errno));
1065                                 rc = -1;
1066                                 goto exit;
1067                         }
1068                 } else {
1069                         dev_target = dev_current;
1070                         fd_target = fd_current;
1071                 }
1072
1073                 rc = flash_write (fd_current, fd_target, dev_target);
1074
1075                 if (HaveRedundEnv) {
1076                         if (close (fd_target)) {
1077                                 fprintf (stderr,
1078                                         "I/O error on %s: %s\n",
1079                                         DEVNAME (dev_target),
1080                                         strerror (errno));
1081                                 rc = -1;
1082                         }
1083                 }
1084         } else {
1085                 rc = flash_read (fd_current);
1086         }
1087
1088 exit:
1089         if (close (fd_current)) {
1090                 fprintf (stderr,
1091                          "I/O error on %s: %s\n",
1092                          DEVNAME (dev_current), strerror (errno));
1093                 return -1;
1094         }
1095
1096         return rc;
1097 }
1098
1099 /*
1100  * Prevent confusion if running from erased flash memory
1101  */
1102 int fw_env_open(struct env_opts *opts)
1103 {
1104         int crc0, crc0_ok;
1105         unsigned char flag0;
1106         void *addr0;
1107
1108         int crc1, crc1_ok;
1109         unsigned char flag1;
1110         void *addr1;
1111
1112         int ret;
1113
1114         struct env_image_single *single;
1115         struct env_image_redundant *redundant;
1116
1117         if (!opts)
1118                 opts = &default_opts;
1119
1120         if (parse_config(opts))         /* should fill envdevices */
1121                 return -1;
1122
1123         addr0 = calloc(1, CUR_ENVSIZE);
1124         if (addr0 == NULL) {
1125                 fprintf(stderr,
1126                         "Not enough memory for environment (%ld bytes)\n",
1127                         CUR_ENVSIZE);
1128                 return -1;
1129         }
1130
1131         /* read environment from FLASH to local buffer */
1132         environment.image = addr0;
1133
1134         if (HaveRedundEnv) {
1135                 redundant = addr0;
1136                 environment.crc         = &redundant->crc;
1137                 environment.flags       = &redundant->flags;
1138                 environment.data        = redundant->data;
1139         } else {
1140                 single = addr0;
1141                 environment.crc         = &single->crc;
1142                 environment.flags       = NULL;
1143                 environment.data        = single->data;
1144         }
1145
1146         dev_current = 0;
1147         if (flash_io (O_RDONLY))
1148                 return -1;
1149
1150         crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
1151
1152         if (opts->aes_flag) {
1153                 ret = env_aes_cbc_crypt(environment.data, 0,
1154                                         opts->aes_key);
1155                 if (ret)
1156                         return ret;
1157         }
1158
1159         crc0_ok = (crc0 == *environment.crc);
1160         if (!HaveRedundEnv) {
1161                 if (!crc0_ok) {
1162                         fprintf (stderr,
1163                                 "Warning: Bad CRC, using default environment\n");
1164                         memcpy(environment.data, default_environment, sizeof default_environment);
1165                 }
1166         } else {
1167                 flag0 = *environment.flags;
1168
1169                 dev_current = 1;
1170                 addr1 = calloc(1, CUR_ENVSIZE);
1171                 if (addr1 == NULL) {
1172                         fprintf(stderr,
1173                                 "Not enough memory for environment (%ld bytes)\n",
1174                                 CUR_ENVSIZE);
1175                         return -1;
1176                 }
1177                 redundant = addr1;
1178
1179                 /*
1180                  * have to set environment.image for flash_read(), careful -
1181                  * other pointers in environment still point inside addr0
1182                  */
1183                 environment.image = addr1;
1184                 if (flash_io (O_RDONLY))
1185                         return -1;
1186
1187                 /* Check flag scheme compatibility */
1188                 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1189                     DEVTYPE(!dev_current) == MTD_NORFLASH) {
1190                         environment.flag_scheme = FLAG_BOOLEAN;
1191                 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1192                            DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1193                         environment.flag_scheme = FLAG_INCREMENTAL;
1194                 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1195                            DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1196                         environment.flag_scheme = FLAG_BOOLEAN;
1197                 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1198                            DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1199                         environment.flag_scheme = FLAG_INCREMENTAL;
1200                 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1201                            DEVTYPE(!dev_current) == MTD_ABSENT) {
1202                         environment.flag_scheme = FLAG_INCREMENTAL;
1203                 } else {
1204                         fprintf (stderr, "Incompatible flash types!\n");
1205                         return -1;
1206                 }
1207
1208                 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
1209
1210                 if (opts->aes_flag) {
1211                         ret = env_aes_cbc_crypt(redundant->data, 0,
1212                                                 opts->aes_key);
1213                         if (ret)
1214                                 return ret;
1215                 }
1216
1217                 crc1_ok = (crc1 == redundant->crc);
1218                 flag1 = redundant->flags;
1219
1220                 if (crc0_ok && !crc1_ok) {
1221                         dev_current = 0;
1222                 } else if (!crc0_ok && crc1_ok) {
1223                         dev_current = 1;
1224                 } else if (!crc0_ok && !crc1_ok) {
1225                         fprintf (stderr,
1226                                 "Warning: Bad CRC, using default environment\n");
1227                         memcpy (environment.data, default_environment,
1228                                 sizeof default_environment);
1229                         dev_current = 0;
1230                 } else {
1231                         switch (environment.flag_scheme) {
1232                         case FLAG_BOOLEAN:
1233                                 if (flag0 == active_flag &&
1234                                     flag1 == obsolete_flag) {
1235                                         dev_current = 0;
1236                                 } else if (flag0 == obsolete_flag &&
1237                                            flag1 == active_flag) {
1238                                         dev_current = 1;
1239                                 } else if (flag0 == flag1) {
1240                                         dev_current = 0;
1241                                 } else if (flag0 == 0xFF) {
1242                                         dev_current = 0;
1243                                 } else if (flag1 == 0xFF) {
1244                                         dev_current = 1;
1245                                 } else {
1246                                         dev_current = 0;
1247                                 }
1248                                 break;
1249                         case FLAG_INCREMENTAL:
1250                                 if (flag0 == 255 && flag1 == 0)
1251                                         dev_current = 1;
1252                                 else if ((flag1 == 255 && flag0 == 0) ||
1253                                          flag0 >= flag1)
1254                                         dev_current = 0;
1255                                 else /* flag1 > flag0 */
1256                                         dev_current = 1;
1257                                 break;
1258                         default:
1259                                 fprintf (stderr, "Unknown flag scheme %u \n",
1260                                          environment.flag_scheme);
1261                                 return -1;
1262                         }
1263                 }
1264
1265                 /*
1266                  * If we are reading, we don't need the flag and the CRC any
1267                  * more, if we are writing, we will re-calculate CRC and update
1268                  * flags before writing out
1269                  */
1270                 if (dev_current) {
1271                         environment.image       = addr1;
1272                         environment.crc         = &redundant->crc;
1273                         environment.flags       = &redundant->flags;
1274                         environment.data        = redundant->data;
1275                         free (addr0);
1276                 } else {
1277                         environment.image       = addr0;
1278                         /* Other pointers are already set */
1279                         free (addr1);
1280                 }
1281 #ifdef DEBUG
1282                 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1283 #endif
1284         }
1285         return 0;
1286 }
1287
1288 static int check_device_config(int dev)
1289 {
1290         struct stat st;
1291         int fd, rc = 0;
1292
1293         if (DEVOFFSET(dev) % DEVESIZE(dev) != 0) {
1294                 fprintf(stderr, "Environment does not start on (erase) block boundary\n");
1295                 errno = EINVAL;
1296                 return -1;
1297         }
1298
1299         if (ENVSIZE(dev) > ENVSECTORS(dev) * DEVESIZE(dev)) {
1300                 fprintf(stderr, "Environment does not fit into available sectors\n");
1301                 errno = EINVAL;
1302                 return -1;
1303         }
1304
1305         fd = open(DEVNAME(dev), O_RDONLY);
1306         if (fd < 0) {
1307                 fprintf(stderr,
1308                         "Cannot open %s: %s\n",
1309                         DEVNAME(dev), strerror(errno));
1310                 return -1;
1311         }
1312
1313         rc = fstat(fd, &st);
1314         if (rc < 0) {
1315                 fprintf(stderr, "Cannot stat the file %s\n",
1316                         DEVNAME(dev));
1317                 goto err;
1318         }
1319
1320         if (S_ISCHR(st.st_mode)) {
1321                 struct mtd_info_user mtdinfo;
1322                 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1323                 if (rc < 0) {
1324                         fprintf(stderr, "Cannot get MTD information for %s\n",
1325                                 DEVNAME(dev));
1326                         goto err;
1327                 }
1328                 if (mtdinfo.type != MTD_NORFLASH &&
1329                     mtdinfo.type != MTD_NANDFLASH &&
1330                     mtdinfo.type != MTD_DATAFLASH &&
1331                     mtdinfo.type != MTD_UBIVOLUME) {
1332                         fprintf(stderr, "Unsupported flash type %u on %s\n",
1333                                 mtdinfo.type, DEVNAME(dev));
1334                         goto err;
1335                 }
1336                 DEVTYPE(dev) = mtdinfo.type;
1337         } else {
1338                 uint64_t size;
1339                 DEVTYPE(dev) = MTD_ABSENT;
1340
1341                 /*
1342                  * Check for negative offsets, treat it as backwards offset
1343                  * from the end of the block device
1344                  */
1345                 if (DEVOFFSET(dev) < 0) {
1346                         rc = ioctl(fd, BLKGETSIZE64, &size);
1347                         if (rc < 0) {
1348                                 fprintf(stderr, "Could not get block device size on %s\n",
1349                                         DEVNAME(dev));
1350                                 goto err;
1351                         }
1352
1353                         DEVOFFSET(dev) = DEVOFFSET(dev) + size;
1354 #ifdef DEBUG
1355                         fprintf(stderr, "Calculated device offset 0x%llx on %s\n",
1356                                 DEVOFFSET(dev), DEVNAME(dev));
1357 #endif
1358                 }
1359         }
1360
1361 err:
1362         close(fd);
1363         return rc;
1364 }
1365
1366 static int parse_config(struct env_opts *opts)
1367 {
1368         int rc;
1369
1370         if (!opts)
1371                 opts = &default_opts;
1372
1373 #if defined(CONFIG_FILE)
1374         /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1375         if (get_config(opts->config_file)) {
1376                 fprintf(stderr, "Cannot parse config file '%s': %m\n",
1377                         opts->config_file);
1378                 return -1;
1379         }
1380 #else
1381         DEVNAME (0) = DEVICE1_NAME;
1382         DEVOFFSET (0) = DEVICE1_OFFSET;
1383         ENVSIZE (0) = ENV1_SIZE;
1384         /* Default values are: erase-size=env-size */
1385         DEVESIZE (0) = ENVSIZE (0);
1386         /* #sectors=env-size/erase-size (rounded up) */
1387         ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1388 #ifdef DEVICE1_ESIZE
1389         DEVESIZE (0) = DEVICE1_ESIZE;
1390 #endif
1391 #ifdef DEVICE1_ENVSECTORS
1392         ENVSECTORS (0) = DEVICE1_ENVSECTORS;
1393 #endif
1394
1395 #ifdef HAVE_REDUND
1396         DEVNAME (1) = DEVICE2_NAME;
1397         DEVOFFSET (1) = DEVICE2_OFFSET;
1398         ENVSIZE (1) = ENV2_SIZE;
1399         /* Default values are: erase-size=env-size */
1400         DEVESIZE (1) = ENVSIZE (1);
1401         /* #sectors=env-size/erase-size (rounded up) */
1402         ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1403 #ifdef DEVICE2_ESIZE
1404         DEVESIZE (1) = DEVICE2_ESIZE;
1405 #endif
1406 #ifdef DEVICE2_ENVSECTORS
1407         ENVSECTORS (1) = DEVICE2_ENVSECTORS;
1408 #endif
1409         HaveRedundEnv = 1;
1410 #endif
1411 #endif
1412         rc = check_device_config(0);
1413         if (rc < 0)
1414                 return rc;
1415
1416         if (HaveRedundEnv) {
1417                 rc = check_device_config(1);
1418                 if (rc < 0)
1419                         return rc;
1420
1421                 if (ENVSIZE(0) != ENVSIZE(1)) {
1422                         fprintf(stderr,
1423                                 "Redundant environments have unequal size");
1424                         return -1;
1425                 }
1426         }
1427
1428         usable_envsize = CUR_ENVSIZE - sizeof(uint32_t);
1429         if (HaveRedundEnv)
1430                 usable_envsize -= sizeof(char);
1431
1432         if (opts->aes_flag)
1433                 usable_envsize &= ~(AES_KEY_LENGTH - 1);
1434
1435         return 0;
1436 }
1437
1438 #if defined(CONFIG_FILE)
1439 static int get_config (char *fname)
1440 {
1441         FILE *fp;
1442         int i = 0;
1443         int rc;
1444         char dump[128];
1445         char *devname;
1446
1447         fp = fopen (fname, "r");
1448         if (fp == NULL)
1449                 return -1;
1450
1451         while (i < 2 && fgets (dump, sizeof (dump), fp)) {
1452                 /* Skip incomplete conversions and comment strings */
1453                 if (dump[0] == '#')
1454                         continue;
1455
1456                 rc = sscanf(dump, "%ms %lli %lx %lx %lx",
1457                             &devname,
1458                             &DEVOFFSET(i),
1459                             &ENVSIZE(i),
1460                             &DEVESIZE(i),
1461                             &ENVSECTORS(i));
1462
1463                 if (rc < 3)
1464                         continue;
1465
1466                 DEVNAME(i) = devname;
1467
1468                 if (rc < 4)
1469                         /* Assume the erase size is the same as the env-size */
1470                         DEVESIZE(i) = ENVSIZE(i);
1471
1472                 if (rc < 5)
1473                         /* Assume enough env sectors to cover the environment */
1474                         ENVSECTORS (i) = (ENVSIZE(i) + DEVESIZE(i) - 1) / DEVESIZE(i);
1475
1476                 i++;
1477         }
1478         fclose (fp);
1479
1480         HaveRedundEnv = i - 1;
1481         if (!i) {                       /* No valid entries found */
1482                 errno = EINVAL;
1483                 return -1;
1484         } else
1485                 return 0;
1486 }
1487 #endif