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  * Test for bad block on NAND, just returns 0 on NOR, on NAND:
 648  * 0    - block is good
 649  * > 0  - block is bad
 650  * < 0  - failed to test
 651  */
 652 static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart)
 653 {
 654         if (mtd_type == MTD_NANDFLASH) {
 655                 int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart);
 656
 657                 if (badblock < 0) {
 658                         perror ("Cannot read bad block mark");
 659                         return badblock;
 660                 }
 661
 662                 if (badblock) {
 663 #ifdef DEBUG
 664                         fprintf (stderr, "Bad block at 0x%llx, skipping\n",
 665                                 (unsigned long long) *blockstart);
 666 #endif
 667                         return badblock;
 668                 }
 669         }
 670
 671         return 0;
 672 }
 673
 674 /*
 675  * Read data from flash at an offset into a provided buffer. On NAND it skips
 676  * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
 677  * the DEVOFFSET (dev) block. On NOR the loop is only run once.
 678  */
 679 static int flash_read_buf (int dev, int fd, void *buf, size_t count,
 680                            off_t offset, uint8_t mtd_type)
 681 {
 682         size_t blocklen;        /* erase / write length - one block on NAND,
 683                                    0 on NOR */
 684         size_t processed = 0;   /* progress counter */
 685         size_t readlen = count; /* current read length */
 686         off_t top_of_range;     /* end of the last block we may use */
 687         off_t block_seek;       /* offset inside the current block to the start
 688                                    of the data */
 689         loff_t blockstart;      /* running start of the current block -
 690                                    MEMGETBADBLOCK needs 64 bits */
 691         int rc;
 692
 693         blockstart = (offset / DEVESIZE (dev)) * DEVESIZE (dev);
 694
 695         /* Offset inside a block */
 696         block_seek = offset - blockstart;
 697
 698         if (mtd_type == MTD_NANDFLASH) {
 699                 /*
 700                  * NAND: calculate which blocks we are reading. We have
 701                  * to read one block at a time to skip bad blocks.
 702                  */
 703                 blocklen = DEVESIZE (dev);
 704
 705                 /*
 706                  * To calculate the top of the range, we have to use the
 707                  * global DEVOFFSET (dev), which can be different from offset
 708                  */
 709                 top_of_range = ((DEVOFFSET(dev) / blocklen) +
 710                                 ENVSECTORS (dev)) * blocklen;
 711
 712                 /* Limit to one block for the first read */
 713                 if (readlen > blocklen - block_seek)
 714                         readlen = blocklen - block_seek;
 715         } else {
 716                 blocklen = 0;
 717                 top_of_range = offset + count;
 718         }
 719
 720         /* This only runs once on NOR flash */
 721         while (processed < count) {
 722                 rc = flash_bad_block (fd, mtd_type, &blockstart);
 723                 if (rc < 0)             /* block test failed */
 724                         return -1;
 725
 726                 if (blockstart + block_seek + readlen > top_of_range) {
 727                         /* End of range is reached */
 728                         fprintf (stderr,
 729                                  "Too few good blocks within range\n");
 730                         return -1;
 731                 }
 732
 733                 if (rc) {               /* block is bad */
 734                         blockstart += blocklen;
 735                         continue;
 736                 }
 737
 738                 /*
 739                  * If a block is bad, we retry in the next block at the same
 740                  * offset - see common/env_nand.c::writeenv()
 741                  */
 742                 lseek (fd, blockstart + block_seek, SEEK_SET);
 743
 744                 rc = read (fd, buf + processed, readlen);
 745                 if (rc != readlen) {
 746                         fprintf (stderr, "Read error on %s: %s\n",
 747                                  DEVNAME (dev), strerror (errno));
 748                         return -1;
 749                 }
 750 #ifdef DEBUG
 751                 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
 752                         rc, (unsigned long long) blockstart + block_seek,
 753                         DEVNAME(dev));
 754 #endif
 755                 processed += readlen;
 756                 readlen = min (blocklen, count - processed);
 757                 block_seek = 0;
 758                 blockstart += blocklen;
 759         }
 760
 761         return processed;
 762 }
 763
 764 /*
 765  * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
 766  * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
 767  * erase and write the whole data at once.
 768  */
 769 static int flash_write_buf (int dev, int fd, void *buf, size_t count,
 770                             off_t offset, uint8_t mtd_type)
 771 {
 772         void *data;
 773         struct erase_info_user erase;
 774         size_t blocklen;        /* length of NAND block / NOR erase sector */
 775         size_t erase_len;       /* whole area that can be erased - may include
 776                                    bad blocks */
 777         size_t erasesize;       /* erase / write length - one block on NAND,
 778                                    whole area on NOR */
 779         size_t processed = 0;   /* progress counter */
 780         size_t write_total;     /* total size to actually write - excluding
 781                                    bad blocks */
 782         off_t erase_offset;     /* offset to the first erase block (aligned)
 783                                    below offset */
 784         off_t block_seek;       /* offset inside the erase block to the start
 785                                    of the data */
 786         off_t top_of_range;     /* end of the last block we may use */
 787         loff_t blockstart;      /* running start of the current block -
 788                                    MEMGETBADBLOCK needs 64 bits */
 789         int rc;
 790
 791         /*
 792          * For mtd devices only offset and size of the environment do matter
 793          */
 794         if (mtd_type == MTD_ABSENT) {
 795                 blocklen = count;
 796                 top_of_range = offset + count;
 797                 erase_len = blocklen;
 798                 blockstart = offset;
 799                 block_seek = 0;
 800                 write_total = blocklen;
 801         } else {
 802                 blocklen = DEVESIZE(dev);
 803
 804                 top_of_range = ((DEVOFFSET(dev) / blocklen) +
 805                                         ENVSECTORS(dev)) * blocklen;
 806
 807                 erase_offset = (offset / blocklen) * blocklen;
 808
 809                 /* Maximum area we may use */
 810                 erase_len = top_of_range - erase_offset;
 811
 812                 blockstart = erase_offset;
 813                 /* Offset inside a block */
 814                 block_seek = offset - erase_offset;
 815
 816                 /*
 817                  * Data size we actually write: from the start of the block
 818                  * to the start of the data, then count bytes of data, and
 819                  * to the end of the block
 820                  */
 821                 write_total = ((block_seek + count + blocklen - 1) /
 822                                                         blocklen) * blocklen;
 823         }
 824
 825         /*
 826          * Support data anywhere within erase sectors: read out the complete
 827          * area to be erased, replace the environment image, write the whole
 828          * block back again.
 829          */
 830         if (write_total > count) {
 831                 data = malloc (erase_len);
 832                 if (!data) {
 833                         fprintf (stderr,
 834                                  "Cannot malloc %zu bytes: %s\n",
 835                                  erase_len, strerror (errno));
 836                         return -1;
 837                 }
 838
 839                 rc = flash_read_buf (dev, fd, data, write_total, erase_offset,
 840                                      mtd_type);
 841                 if (write_total != rc)
 842                         return -1;
 843
 844 #ifdef DEBUG
 845                 fprintf(stderr, "Preserving data ");
 846                 if (block_seek != 0)
 847                         fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
 848                 if (block_seek + count != write_total) {
 849                         if (block_seek != 0)
 850                                 fprintf(stderr, " and ");
 851                         fprintf(stderr, "0x%lx - 0x%lx",
 852                                 (unsigned long) block_seek + count,
 853                                 (unsigned long) write_total - 1);
 854                 }
 855                 fprintf(stderr, "\n");
 856 #endif
 857                 /* Overwrite the old environment */
 858                 memcpy (data + block_seek, buf, count);
 859         } else {
 860                 /*
 861                  * We get here, iff offset is block-aligned and count is a
 862                  * multiple of blocklen - see write_total calculation above
 863                  */
 864                 data = buf;
 865         }
 866
 867         if (mtd_type == MTD_NANDFLASH) {
 868                 /*
 869                  * NAND: calculate which blocks we are writing. We have
 870                  * to write one block at a time to skip bad blocks.
 871                  */
 872                 erasesize = blocklen;
 873         } else {
 874                 erasesize = erase_len;
 875         }
 876
 877         erase.length = erasesize;
 878
 879         /* This only runs once on NOR flash and SPI-dataflash */
 880         while (processed < write_total) {
 881                 rc = flash_bad_block (fd, mtd_type, &blockstart);
 882                 if (rc < 0)             /* block test failed */
 883                         return rc;
 884
 885                 if (blockstart + erasesize > top_of_range) {
 886                         fprintf (stderr, "End of range reached, aborting\n");
 887                         return -1;
 888                 }
 889
 890                 if (rc) {               /* block is bad */
 891                         blockstart += blocklen;
 892                         continue;
 893                 }
 894
 895                 if (mtd_type != MTD_ABSENT) {
 896                         erase.start = blockstart;
 897                         ioctl(fd, MEMUNLOCK, &erase);
 898                         /* These do not need an explicit erase cycle */
 899                         if (mtd_type != MTD_DATAFLASH)
 900                                 if (ioctl(fd, MEMERASE, &erase) != 0) {
 901                                         fprintf(stderr,
 902                                                 "MTD erase error on %s: %s\n",
 903                                                 DEVNAME(dev), strerror(errno));
 904                                         return -1;
 905                                 }
 906                 }
 907
 908                 if (lseek (fd, blockstart, SEEK_SET) == -1) {
 909                         fprintf (stderr,
 910                                  "Seek error on %s: %s\n",
 911                                  DEVNAME (dev), strerror (errno));
 912                         return -1;
 913                 }
 914
 915 #ifdef DEBUG
 916                 fprintf(stderr, "Write 0x%llx bytes at 0x%llx\n",
 917                         (unsigned long long) erasesize,
 918                         (unsigned long long) blockstart);
 919 #endif
 920                 if (write (fd, data + processed, erasesize) != erasesize) {
 921                         fprintf (stderr, "Write error on %s: %s\n",
 922                                  DEVNAME (dev), strerror (errno));
 923                         return -1;
 924                 }
 925
 926                 if (mtd_type != MTD_ABSENT)
 927                         ioctl(fd, MEMLOCK, &erase);
 928
 929                 processed  += erasesize;
 930                 block_seek = 0;
 931                 blockstart += erasesize;
 932         }
 933
 934         if (write_total > count)
 935                 free (data);
 936
 937         return processed;
 938 }
 939
 940 /*
 941  * Set obsolete flag at offset - NOR flash only
 942  */
 943 static int flash_flag_obsolete (int dev, int fd, off_t offset)
 944 {
 945         int rc;
 946         struct erase_info_user erase;
 947
 948         erase.start  = DEVOFFSET (dev);
 949         erase.length = DEVESIZE (dev);
 950         /* This relies on the fact, that obsolete_flag == 0 */
 951         rc = lseek (fd, offset, SEEK_SET);
 952         if (rc < 0) {
 953                 fprintf (stderr, "Cannot seek to set the flag on %s \n",
 954                          DEVNAME (dev));
 955                 return rc;
 956         }
 957         ioctl (fd, MEMUNLOCK, &erase);
 958         rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
 959         ioctl (fd, MEMLOCK, &erase);
 960         if (rc < 0)
 961                 perror ("Could not set obsolete flag");
 962
 963         return rc;
 964 }
 965
 966 /* Encrypt or decrypt the environment before writing or reading it. */
 967 static int env_aes_cbc_crypt(char *payload, const int enc, uint8_t *key)
 968 {
 969         uint8_t *data = (uint8_t *)payload;
 970         const int len = usable_envsize;
 971         uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
 972         uint32_t aes_blocks;
 973
 974         /* First we expand the key. */
 975         aes_expand_key(key, key_exp);
 976
 977         /* Calculate the number of AES blocks to encrypt. */
 978         aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
 979
 980         if (enc)
 981                 aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
 982         else
 983                 aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
 984
 985         return 0;
 986 }
 987
 988 static int flash_write (int fd_current, int fd_target, int dev_target)
 989 {
 990         int rc;
 991
 992         switch (environment.flag_scheme) {
 993         case FLAG_NONE:
 994                 break;
 995         case FLAG_INCREMENTAL:
 996                 (*environment.flags)++;
 997                 break;
 998         case FLAG_BOOLEAN:
 999                 *environment.flags = active_flag;
1000                 break;
1001         default:
1002                 fprintf (stderr, "Unimplemented flash scheme %u \n",
1003                          environment.flag_scheme);
1004                 return -1;
1005         }
1006
1007 #ifdef DEBUG
1008         fprintf(stderr, "Writing new environment at 0x%llx on %s\n",
1009                 DEVOFFSET (dev_target), DEVNAME (dev_target));
1010 #endif
1011
1012         rc = flash_write_buf(dev_target, fd_target, environment.image,
1013                               CUR_ENVSIZE, DEVOFFSET(dev_target),
1014                               DEVTYPE(dev_target));
1015         if (rc < 0)
1016                 return rc;
1017
1018         if (environment.flag_scheme == FLAG_BOOLEAN) {
1019                 /* Have to set obsolete flag */
1020                 off_t offset = DEVOFFSET (dev_current) +
1021                         offsetof (struct env_image_redundant, flags);
1022 #ifdef DEBUG
1023                 fprintf(stderr,
1024                         "Setting obsolete flag in environment at 0x%llx on %s\n",
1025                         DEVOFFSET (dev_current), DEVNAME (dev_current));
1026 #endif
1027                 flash_flag_obsolete (dev_current, fd_current, offset);
1028         }
1029
1030         return 0;
1031 }
1032
1033 static int flash_read (int fd)
1034 {
1035         int rc;
1036
1037         rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1038                             DEVOFFSET(dev_current), DEVTYPE(dev_current));
1039         if (rc != CUR_ENVSIZE)
1040                 return -1;
1041
1042         return 0;
1043 }
1044
1045 static int flash_io (int mode)
1046 {
1047         int fd_current, fd_target, rc, dev_target;
1048
1049         /* dev_current: fd_current, erase_current */
1050         fd_current = open (DEVNAME (dev_current), mode);
1051         if (fd_current < 0) {
1052                 fprintf (stderr,
1053                          "Can't open %s: %s\n",
1054                          DEVNAME (dev_current), strerror (errno));
1055                 return -1;
1056         }
1057
1058         if (mode == O_RDWR) {
1059                 if (HaveRedundEnv) {
1060                         /* switch to next partition for writing */
1061                         dev_target = !dev_current;
1062                         /* dev_target: fd_target, erase_target */
1063                         fd_target = open (DEVNAME (dev_target), mode);
1064                         if (fd_target < 0) {
1065                                 fprintf (stderr,
1066                                          "Can't open %s: %s\n",
1067                                          DEVNAME (dev_target),
1068                                          strerror (errno));
1069                                 rc = -1;
1070                                 goto exit;
1071                         }
1072                 } else {
1073                         dev_target = dev_current;
1074                         fd_target = fd_current;
1075                 }
1076
1077                 rc = flash_write (fd_current, fd_target, dev_target);
1078
1079                 if (HaveRedundEnv) {
1080                         if (close (fd_target)) {
1081                                 fprintf (stderr,
1082                                         "I/O error on %s: %s\n",
1083                                         DEVNAME (dev_target),
1084                                         strerror (errno));
1085                                 rc = -1;
1086                         }
1087                 }
1088         } else {
1089                 rc = flash_read (fd_current);
1090         }
1091
1092 exit:
1093         if (close (fd_current)) {
1094                 fprintf (stderr,
1095                          "I/O error on %s: %s\n",
1096                          DEVNAME (dev_current), strerror (errno));
1097                 return -1;
1098         }
1099
1100         return rc;
1101 }
1102
1103 /*
1104  * Prevent confusion if running from erased flash memory
1105  */
1106 int fw_env_open(struct env_opts *opts)
1107 {
1108         int crc0, crc0_ok;
1109         unsigned char flag0;
1110         void *addr0;
1111
1112         int crc1, crc1_ok;
1113         unsigned char flag1;
1114         void *addr1;
1115
1116         int ret;
1117
1118         struct env_image_single *single;
1119         struct env_image_redundant *redundant;
1120
1121         if (!opts)
1122                 opts = &default_opts;
1123
1124         if (parse_config(opts))         /* should fill envdevices */
1125                 return -1;
1126
1127         addr0 = calloc(1, CUR_ENVSIZE);
1128         if (addr0 == NULL) {
1129                 fprintf(stderr,
1130                         "Not enough memory for environment (%ld bytes)\n",
1131                         CUR_ENVSIZE);
1132                 return -1;
1133         }
1134
1135         /* read environment from FLASH to local buffer */
1136         environment.image = addr0;
1137
1138         if (HaveRedundEnv) {
1139                 redundant = addr0;
1140                 environment.crc         = &redundant->crc;
1141                 environment.flags       = &redundant->flags;
1142                 environment.data        = redundant->data;
1143         } else {
1144                 single = addr0;
1145                 environment.crc         = &single->crc;
1146                 environment.flags       = NULL;
1147                 environment.data        = single->data;
1148         }
1149
1150         dev_current = 0;
1151         if (flash_io (O_RDONLY))
1152                 return -1;
1153
1154         crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
1155
1156         if (opts->aes_flag) {
1157                 ret = env_aes_cbc_crypt(environment.data, 0,
1158                                         opts->aes_key);
1159                 if (ret)
1160                         return ret;
1161         }
1162
1163         crc0_ok = (crc0 == *environment.crc);
1164         if (!HaveRedundEnv) {
1165                 if (!crc0_ok) {
1166                         fprintf (stderr,
1167                                 "Warning: Bad CRC, using default environment\n");
1168                         memcpy(environment.data, default_environment, sizeof default_environment);
1169                 }
1170         } else {
1171                 flag0 = *environment.flags;
1172
1173                 dev_current = 1;
1174                 addr1 = calloc(1, CUR_ENVSIZE);
1175                 if (addr1 == NULL) {
1176                         fprintf(stderr,
1177                                 "Not enough memory for environment (%ld bytes)\n",
1178                                 CUR_ENVSIZE);
1179                         return -1;
1180                 }
1181                 redundant = addr1;
1182
1183                 /*
1184                  * have to set environment.image for flash_read(), careful -
1185                  * other pointers in environment still point inside addr0
1186                  */
1187                 environment.image = addr1;
1188                 if (flash_io (O_RDONLY))
1189                         return -1;
1190
1191                 /* Check flag scheme compatibility */
1192                 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1193                     DEVTYPE(!dev_current) == MTD_NORFLASH) {
1194                         environment.flag_scheme = FLAG_BOOLEAN;
1195                 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1196                            DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1197                         environment.flag_scheme = FLAG_INCREMENTAL;
1198                 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1199                            DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1200                         environment.flag_scheme = FLAG_BOOLEAN;
1201                 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1202                            DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1203                         environment.flag_scheme = FLAG_INCREMENTAL;
1204                 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1205                            DEVTYPE(!dev_current) == MTD_ABSENT) {
1206                         environment.flag_scheme = FLAG_INCREMENTAL;
1207                 } else {
1208                         fprintf (stderr, "Incompatible flash types!\n");
1209                         return -1;
1210                 }
1211
1212                 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
1213
1214                 if (opts->aes_flag) {
1215                         ret = env_aes_cbc_crypt(redundant->data, 0,
1216                                                 opts->aes_key);
1217                         if (ret)
1218                                 return ret;
1219                 }
1220
1221                 crc1_ok = (crc1 == redundant->crc);
1222                 flag1 = redundant->flags;
1223
1224                 if (crc0_ok && !crc1_ok) {
1225                         dev_current = 0;
1226                 } else if (!crc0_ok && crc1_ok) {
1227                         dev_current = 1;
1228                 } else if (!crc0_ok && !crc1_ok) {
1229                         fprintf (stderr,
1230                                 "Warning: Bad CRC, using default environment\n");
1231                         memcpy (environment.data, default_environment,
1232                                 sizeof default_environment);
1233                         dev_current = 0;
1234                 } else {
1235                         switch (environment.flag_scheme) {
1236                         case FLAG_BOOLEAN:
1237                                 if (flag0 == active_flag &&
1238                                     flag1 == obsolete_flag) {
1239                                         dev_current = 0;
1240                                 } else if (flag0 == obsolete_flag &&
1241                                            flag1 == active_flag) {
1242                                         dev_current = 1;
1243                                 } else if (flag0 == flag1) {
1244                                         dev_current = 0;
1245                                 } else if (flag0 == 0xFF) {
1246                                         dev_current = 0;
1247                                 } else if (flag1 == 0xFF) {
1248                                         dev_current = 1;
1249                                 } else {
1250                                         dev_current = 0;
1251                                 }
1252                                 break;
1253                         case FLAG_INCREMENTAL:
1254                                 if (flag0 == 255 && flag1 == 0)
1255                                         dev_current = 1;
1256                                 else if ((flag1 == 255 && flag0 == 0) ||
1257                                          flag0 >= flag1)
1258                                         dev_current = 0;
1259                                 else /* flag1 > flag0 */
1260                                         dev_current = 1;
1261                                 break;
1262                         default:
1263                                 fprintf (stderr, "Unknown flag scheme %u \n",
1264                                          environment.flag_scheme);
1265                                 return -1;
1266                         }
1267                 }
1268
1269                 /*
1270                  * If we are reading, we don't need the flag and the CRC any
1271                  * more, if we are writing, we will re-calculate CRC and update
1272                  * flags before writing out
1273                  */
1274                 if (dev_current) {
1275                         environment.image       = addr1;
1276                         environment.crc         = &redundant->crc;
1277                         environment.flags       = &redundant->flags;
1278                         environment.data        = redundant->data;
1279                         free (addr0);
1280                 } else {
1281                         environment.image       = addr0;
1282                         /* Other pointers are already set */
1283                         free (addr1);
1284                 }
1285 #ifdef DEBUG
1286                 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1287 #endif
1288         }
1289         return 0;
1290 }
1291
1292 static int check_device_config(int dev)
1293 {
1294         struct stat st;
1295         int fd, rc = 0;
1296
1297         if (DEVOFFSET(dev) % DEVESIZE(dev) != 0) {
1298                 fprintf(stderr, "Environment does not start on (erase) block boundary\n");
1299                 errno = EINVAL;
1300                 return -1;
1301         }
1302
1303         if (ENVSIZE(dev) > ENVSECTORS(dev) * DEVESIZE(dev)) {
1304                 fprintf(stderr, "Environment does not fit into available sectors\n");
1305                 errno = EINVAL;
1306                 return -1;
1307         }
1308
1309         fd = open(DEVNAME(dev), O_RDONLY);
1310         if (fd < 0) {
1311                 fprintf(stderr,
1312                         "Cannot open %s: %s\n",
1313                         DEVNAME(dev), strerror(errno));
1314                 return -1;
1315         }
1316
1317         rc = fstat(fd, &st);
1318         if (rc < 0) {
1319                 fprintf(stderr, "Cannot stat the file %s\n",
1320                         DEVNAME(dev));
1321                 goto err;
1322         }
1323
1324         if (S_ISCHR(st.st_mode)) {
1325                 struct mtd_info_user mtdinfo;
1326                 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1327                 if (rc < 0) {
1328                         fprintf(stderr, "Cannot get MTD information for %s\n",
1329                                 DEVNAME(dev));
1330                         goto err;
1331                 }
1332                 if (mtdinfo.type != MTD_NORFLASH &&
1333                     mtdinfo.type != MTD_NANDFLASH &&
1334                     mtdinfo.type != MTD_DATAFLASH &&
1335                     mtdinfo.type != MTD_UBIVOLUME) {
1336                         fprintf(stderr, "Unsupported flash type %u on %s\n",
1337                                 mtdinfo.type, DEVNAME(dev));
1338                         goto err;
1339                 }
1340                 DEVTYPE(dev) = mtdinfo.type;
1341         } else {
1342                 uint64_t size;
1343                 DEVTYPE(dev) = MTD_ABSENT;
1344
1345                 /*
1346                  * Check for negative offsets, treat it as backwards offset
1347                  * from the end of the block device
1348                  */
1349                 if (DEVOFFSET(dev) < 0) {
1350                         rc = ioctl(fd, BLKGETSIZE64, &size);
1351                         if (rc < 0) {
1352                                 fprintf(stderr, "Could not get block device size on %s\n",
1353                                         DEVNAME(dev));
1354                                 goto err;
1355                         }
1356
1357                         DEVOFFSET(dev) = DEVOFFSET(dev) + size;
1358 #ifdef DEBUG
1359                         fprintf(stderr, "Calculated device offset 0x%llx on %s\n",
1360                                 DEVOFFSET(dev), DEVNAME(dev));
1361 #endif
1362                 }
1363         }
1364
1365 err:
1366         close(fd);
1367         return rc;
1368 }
1369
1370 static int parse_config(struct env_opts *opts)
1371 {
1372         int rc;
1373
1374         if (!opts)
1375                 opts = &default_opts;
1376
1377 #if defined(CONFIG_FILE)
1378         /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1379         if (get_config(opts->config_file)) {
1380                 fprintf(stderr, "Cannot parse config file '%s': %m\n",
1381                         opts->config_file);
1382                 return -1;
1383         }
1384 #else
1385         DEVNAME (0) = DEVICE1_NAME;
1386         DEVOFFSET (0) = DEVICE1_OFFSET;
1387         ENVSIZE (0) = ENV1_SIZE;
1388         /* Default values are: erase-size=env-size */
1389         DEVESIZE (0) = ENVSIZE (0);
1390         /* #sectors=env-size/erase-size (rounded up) */
1391         ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1392 #ifdef DEVICE1_ESIZE
1393         DEVESIZE (0) = DEVICE1_ESIZE;
1394 #endif
1395 #ifdef DEVICE1_ENVSECTORS
1396         ENVSECTORS (0) = DEVICE1_ENVSECTORS;
1397 #endif
1398
1399 #ifdef HAVE_REDUND
1400         DEVNAME (1) = DEVICE2_NAME;
1401         DEVOFFSET (1) = DEVICE2_OFFSET;
1402         ENVSIZE (1) = ENV2_SIZE;
1403         /* Default values are: erase-size=env-size */
1404         DEVESIZE (1) = ENVSIZE (1);
1405         /* #sectors=env-size/erase-size (rounded up) */
1406         ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1407 #ifdef DEVICE2_ESIZE
1408         DEVESIZE (1) = DEVICE2_ESIZE;
1409 #endif
1410 #ifdef DEVICE2_ENVSECTORS
1411         ENVSECTORS (1) = DEVICE2_ENVSECTORS;
1412 #endif
1413         HaveRedundEnv = 1;
1414 #endif
1415 #endif
1416         rc = check_device_config(0);
1417         if (rc < 0)
1418                 return rc;
1419
1420         if (HaveRedundEnv) {
1421                 rc = check_device_config(1);
1422                 if (rc < 0)
1423                         return rc;
1424
1425                 if (ENVSIZE(0) != ENVSIZE(1)) {
1426                         fprintf(stderr,
1427                                 "Redundant environments have unequal size");
1428                         return -1;
1429                 }
1430         }
1431
1432         usable_envsize = CUR_ENVSIZE - sizeof(uint32_t);
1433         if (HaveRedundEnv)
1434                 usable_envsize -= sizeof(char);
1435
1436         if (opts->aes_flag)
1437                 usable_envsize &= ~(AES_KEY_LENGTH - 1);
1438
1439         return 0;
1440 }
1441
1442 #if defined(CONFIG_FILE)
1443 static int get_config (char *fname)
1444 {
1445         FILE *fp;
1446         int i = 0;
1447         int rc;
1448         char dump[128];
1449         char *devname;
1450
1451         fp = fopen (fname, "r");
1452         if (fp == NULL)
1453                 return -1;
1454
1455         while (i < 2 && fgets (dump, sizeof (dump), fp)) {
1456                 /* Skip incomplete conversions and comment strings */
1457                 if (dump[0] == '#')
1458                         continue;
1459
1460                 rc = sscanf(dump, "%ms %lli %lx %lx %lx",
1461                             &devname,
1462                             &DEVOFFSET(i),
1463                             &ENVSIZE(i),
1464                             &DEVESIZE(i),
1465                             &ENVSECTORS(i));
1466
1467                 if (rc < 3)
1468                         continue;
1469
1470                 DEVNAME(i) = devname;
1471
1472                 if (rc < 4)
1473                         /* Assume the erase size is the same as the env-size */
1474                         DEVESIZE(i) = ENVSIZE(i);
1475
1476                 if (rc < 5)
1477                         /* Assume enough env sectors to cover the environment */
1478                         ENVSECTORS (i) = (ENVSIZE(i) + DEVESIZE(i) - 1) / DEVESIZE(i);
1479
1480                 i++;
1481         }
1482         fclose (fp);
1483
1484         HaveRedundEnv = i - 1;
1485         if (!i) {                       /* No valid entries found */
1486                 errno = EINVAL;
1487                 return -1;
1488         } else
1489                 return 0;
1490 }
1491 #endif