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