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