tools/env/fw_env.c

   1 /*
   2  * (C) Copyright 2000-2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <stddef.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #include <sys/ioctl.h>
  32 #include <sys/stat.h>
  33 #include <unistd.h>
  34
  35 #ifdef MTD_OLD
  36 # include <linux/mtd/mtd.h>
  37 #else
  38 # define  __user        /* nothing */
  39 # include <mtd/mtd-user.h>
  40 #endif
  41
  42 #include "fw_env.h"
  43
  44 #define CMD_GETENV      "fw_printenv"
  45 #define CMD_SETENV      "fw_setenv"
  46
  47 typedef struct envdev_s {
  48         char devname[16];               /* Device name */
  49         ulong devoff;                   /* Device offset */
  50         ulong env_size;                 /* environment size */
  51         ulong erase_size;               /* device erase size */
  52 } envdev_t;
  53
  54 static envdev_t envdevices[2];
  55 static int curdev;
  56
  57 #define DEVNAME(i)    envdevices[(i)].devname
  58 #define DEVOFFSET(i)  envdevices[(i)].devoff
  59 #define ENVSIZE(i)    envdevices[(i)].env_size
  60 #define DEVESIZE(i)   envdevices[(i)].erase_size
  61
  62 #define CFG_ENV_SIZE ENVSIZE(curdev)
  63
  64 #define ENV_SIZE      getenvsize()
  65
  66 typedef struct environment_s {
  67         ulong crc;                      /* CRC32 over data bytes    */
  68         unsigned char flags;            /* active or obsolete */
  69         char *data;
  70 } env_t;
  71
  72 static env_t environment;
  73
  74 static int HaveRedundEnv = 0;
  75
  76 static unsigned char active_flag = 1;
  77 static unsigned char obsolete_flag = 0;
  78
  79
  80 #define XMK_STR(x)      #x
  81 #define MK_STR(x)       XMK_STR(x)
  82
  83 static char default_environment[] = {
  84 #if defined(CONFIG_BOOTARGS)
  85         "bootargs=" CONFIG_BOOTARGS "\0"
  86 #endif
  87 #if defined(CONFIG_BOOTCOMMAND)
  88         "bootcmd=" CONFIG_BOOTCOMMAND "\0"
  89 #endif
  90 #if defined(CONFIG_RAMBOOTCOMMAND)
  91         "ramboot=" CONFIG_RAMBOOTCOMMAND "\0"
  92 #endif
  93 #if defined(CONFIG_NFSBOOTCOMMAND)
  94         "nfsboot=" CONFIG_NFSBOOTCOMMAND "\0"
  95 #endif
  96 #if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
  97         "bootdelay=" MK_STR (CONFIG_BOOTDELAY) "\0"
  98 #endif
  99 #if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
 100         "baudrate=" MK_STR (CONFIG_BAUDRATE) "\0"
 101 #endif
 102 #ifdef  CONFIG_LOADS_ECHO
 103         "loads_echo=" MK_STR (CONFIG_LOADS_ECHO) "\0"
 104 #endif
 105 #ifdef  CONFIG_ETHADDR
 106         "ethaddr=" MK_STR (CONFIG_ETHADDR) "\0"
 107 #endif
 108 #ifdef  CONFIG_ETH1ADDR
 109         "eth1addr=" MK_STR (CONFIG_ETH1ADDR) "\0"
 110 #endif
 111 #ifdef  CONFIG_ETH2ADDR
 112         "eth2addr=" MK_STR (CONFIG_ETH2ADDR) "\0"
 113 #endif
 114 #ifdef  CONFIG_ETH3ADDR
 115         "eth3addr=" MK_STR (CONFIG_ETH3ADDR) "\0"
 116 #endif
 117 #ifdef  CONFIG_ETHPRIME
 118         "ethprime=" CONFIG_ETHPRIME "\0"
 119 #endif
 120 #ifdef  CONFIG_IPADDR
 121         "ipaddr=" MK_STR (CONFIG_IPADDR) "\0"
 122 #endif
 123 #ifdef  CONFIG_SERVERIP
 124         "serverip=" MK_STR (CONFIG_SERVERIP) "\0"
 125 #endif
 126 #ifdef  CFG_AUTOLOAD
 127         "autoload=" CFG_AUTOLOAD "\0"
 128 #endif
 129 #ifdef  CONFIG_ROOTPATH
 130         "rootpath=" MK_STR (CONFIG_ROOTPATH) "\0"
 131 #endif
 132 #ifdef  CONFIG_GATEWAYIP
 133         "gatewayip=" MK_STR (CONFIG_GATEWAYIP) "\0"
 134 #endif
 135 #ifdef  CONFIG_NETMASK
 136         "netmask=" MK_STR (CONFIG_NETMASK) "\0"
 137 #endif
 138 #ifdef  CONFIG_HOSTNAME
 139         "hostname=" MK_STR (CONFIG_HOSTNAME) "\0"
 140 #endif
 141 #ifdef  CONFIG_BOOTFILE
 142         "bootfile=" MK_STR (CONFIG_BOOTFILE) "\0"
 143 #endif
 144 #ifdef  CONFIG_LOADADDR
 145         "loadaddr=" MK_STR (CONFIG_LOADADDR) "\0"
 146 #endif
 147 #ifdef  CONFIG_PREBOOT
 148         "preboot=" CONFIG_PREBOOT "\0"
 149 #endif
 150 #ifdef  CONFIG_CLOCKS_IN_MHZ
 151         "clocks_in_mhz=" "1" "\0"
 152 #endif
 153 #if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
 154         "pcidelay=" MK_STR (CONFIG_PCI_BOOTDELAY) "\0"
 155 #endif
 156 #ifdef  CONFIG_EXTRA_ENV_SETTINGS
 157         CONFIG_EXTRA_ENV_SETTINGS
 158 #endif
 159         "\0"                    /* Termimate env_t data with 2 NULs */
 160 };
 161
 162 static int flash_io (int mode);
 163 static char *envmatch (char * s1, char * s2);
 164 static int env_init (void);
 165 static int parse_config (void);
 166
 167 #if defined(CONFIG_FILE)
 168 static int get_config (char *);
 169 #endif
 170 static inline ulong getenvsize (void)
 171 {
 172         ulong rc = CFG_ENV_SIZE - sizeof (long);
 173
 174         if (HaveRedundEnv)
 175                 rc -= sizeof (char);
 176         return rc;
 177 }
 178
 179 /*
 180  * Search the environment for a variable.
 181  * Return the value, if found, or NULL, if not found.
 182  */
 183 char *fw_getenv (char *name)
 184 {
 185         char *env, *nxt;
 186
 187         if (env_init ())
 188                 return (NULL);
 189
 190         for (env = environment.data; *env; env = nxt + 1) {
 191                 char *val;
 192
 193                 for (nxt = env; *nxt; ++nxt) {
 194                         if (nxt >= &environment.data[ENV_SIZE]) {
 195                                 fprintf (stderr, "## Error: "
 196                                         "environment not terminated\n");
 197                                 return (NULL);
 198                         }
 199                 }
 200                 val = envmatch (name, env);
 201                 if (!val)
 202                         continue;
 203                 return (val);
 204         }
 205         return (NULL);
 206 }
 207
 208 /*
 209  * Print the current definition of one, or more, or all
 210  * environment variables
 211  */
 212 void fw_printenv (int argc, char *argv[])
 213 {
 214         char *env, *nxt;
 215         int i, n_flag;
 216
 217         if (env_init ())
 218                 return;
 219
 220         if (argc == 1) {                /* Print all env variables  */
 221                 for (env = environment.data; *env; env = nxt + 1) {
 222                         for (nxt = env; *nxt; ++nxt) {
 223                                 if (nxt >= &environment.data[ENV_SIZE]) {
 224                                         fprintf (stderr, "## Error: "
 225                                                 "environment not terminated\n");
 226                                         return;
 227                                 }
 228                         }
 229
 230                         printf ("%s\n", env);
 231                 }
 232                 return;
 233         }
 234
 235         if (strcmp (argv[1], "-n") == 0) {
 236                 n_flag = 1;
 237                 ++argv;
 238                 --argc;
 239                 if (argc != 2) {
 240                         fprintf (stderr, "## Error: "
 241                                 "`-n' option requires exactly one argument\n");
 242                         return;
 243                 }
 244         } else {
 245                 n_flag = 0;
 246         }
 247
 248         for (i = 1; i < argc; ++i) {    /* print single env variables   */
 249                 char *name = argv[i];
 250                 char *val = NULL;
 251
 252                 for (env = environment.data; *env; env = nxt + 1) {
 253
 254                         for (nxt = env; *nxt; ++nxt) {
 255                                 if (nxt >= &environment.data[ENV_SIZE]) {
 256                                         fprintf (stderr, "## Error: "
 257                                                 "environment not terminated\n");
 258                                         return;
 259                                 }
 260                         }
 261                         val = envmatch (name, env);
 262                         if (val) {
 263                                 if (!n_flag) {
 264                                         fputs (name, stdout);
 265                                         putc ('=', stdout);
 266                                 }
 267                                 puts (val);
 268                                 break;
 269                         }
 270                 }
 271                 if (!val)
 272                         fprintf (stderr, "## Error: \"%s\" not defined\n", name);
 273         }
 274 }
 275
 276 /*
 277  * Deletes or sets environment variables. Returns errno style error codes:
 278  * 0      - OK
 279  * EINVAL - need at least 1 argument
 280  * EROFS  - certain variables ("ethaddr", "serial#") cannot be
 281  *          modified or deleted
 282  *
 283  */
 284 int fw_setenv (int argc, char *argv[])
 285 {
 286         int i, len;
 287         char *env, *nxt;
 288         char *oldval = NULL;
 289         char *name;
 290
 291         if (argc < 2) {
 292                 return (EINVAL);
 293         }
 294
 295         if (env_init ())
 296                 return (errno);
 297
 298         name = argv[1];
 299
 300         /*
 301          * search if variable with this name already exists
 302          */
 303         for (nxt = env = environment.data; *env; env = nxt + 1) {
 304                 for (nxt = env; *nxt; ++nxt) {
 305                         if (nxt >= &environment.data[ENV_SIZE]) {
 306                                 fprintf (stderr, "## Error: "
 307                                         "environment not terminated\n");
 308                                 return (EINVAL);
 309                         }
 310                 }
 311                 if ((oldval = envmatch (name, env)) != NULL)
 312                         break;
 313         }
 314
 315         /*
 316          * Delete any existing definition
 317          */
 318         if (oldval) {
 319                 /*
 320                  * Ethernet Address and serial# can be set only once
 321                  */
 322                 if ((strcmp (name, "ethaddr") == 0) ||
 323                         (strcmp (name, "serial#") == 0)) {
 324                         fprintf (stderr, "Can't overwrite \"%s\"\n", name);
 325                         return (EROFS);
 326                 }
 327
 328                 if (*++nxt == '\0') {
 329                         *env = '\0';
 330                 } else {
 331                         for (;;) {
 332                                 *env = *nxt++;
 333                                 if ((*env == '\0') && (*nxt == '\0'))
 334                                         break;
 335                                 ++env;
 336                         }
 337                 }
 338                 *++env = '\0';
 339         }
 340
 341         /* Delete only ? */
 342         if (argc < 3)
 343                 goto WRITE_FLASH;
 344
 345         /*
 346          * Append new definition at the end
 347          */
 348         for (env = environment.data; *env || *(env + 1); ++env);
 349         if (env > environment.data)
 350                 ++env;
 351         /*
 352          * Overflow when:
 353          * "name" + "=" + "val" +"\0\0"  > CFG_ENV_SIZE - (env-environment)
 354          */
 355         len = strlen (name) + 2;
 356         /* add '=' for first arg, ' ' for all others */
 357         for (i = 2; i < argc; ++i) {
 358                 len += strlen (argv[i]) + 1;
 359         }
 360         if (len > (&environment.data[ENV_SIZE] - env)) {
 361                 fprintf (stderr,
 362                         "Error: environment overflow, \"%s\" deleted\n",
 363                         name);
 364                 return (-1);
 365         }
 366         while ((*env = *name++) != '\0')
 367                 env++;
 368         for (i = 2; i < argc; ++i) {
 369                 char *val = argv[i];
 370
 371                 *env = (i == 2) ? '=' : ' ';
 372                 while ((*++env = *val++) != '\0');
 373         }
 374
 375         /* end is marked with double '\0' */
 376         *++env = '\0';
 377
 378   WRITE_FLASH:
 379
 380         /* Update CRC */
 381         environment.crc = crc32 (0, (uint8_t*) environment.data, ENV_SIZE);
 382
 383         /* write environment back to flash */
 384         if (flash_io (O_RDWR)) {
 385                 fprintf (stderr, "Error: can't write fw_env to flash\n");
 386                 return (-1);
 387         }
 388
 389         return (0);
 390 }
 391
 392 static int flash_io (int mode)
 393 {
 394         int fd, fdr, rc, otherdev, len, resid;
 395         erase_info_t erase;
 396         char *data = NULL;
 397
 398         if ((fd = open (DEVNAME (curdev), mode)) < 0) {
 399                 fprintf (stderr,
 400                         "Can't open %s: %s\n",
 401                         DEVNAME (curdev), strerror (errno));
 402                 return (-1);
 403         }
 404
 405         len = sizeof (environment.crc);
 406         if (HaveRedundEnv) {
 407                 len += sizeof (environment.flags);
 408         }
 409
 410         if (mode == O_RDWR) {
 411                 if (HaveRedundEnv) {
 412                         /* switch to next partition for writing */
 413                         otherdev = !curdev;
 414                         if ((fdr = open (DEVNAME (otherdev), mode)) < 0) {
 415                                 fprintf (stderr,
 416                                         "Can't open %s: %s\n",
 417                                         DEVNAME (otherdev),
 418                                         strerror (errno));
 419                                 return (-1);
 420                         }
 421                 } else {
 422                         otherdev = curdev;
 423                         fdr = fd;
 424                 }
 425                 printf ("Unlocking flash...\n");
 426                 erase.length = DEVESIZE (otherdev);
 427                 erase.start = DEVOFFSET (otherdev);
 428                 ioctl (fdr, MEMUNLOCK, &erase);
 429
 430                 if (HaveRedundEnv) {
 431                         erase.length = DEVESIZE (curdev);
 432                         erase.start = DEVOFFSET (curdev);
 433                         ioctl (fd, MEMUNLOCK, &erase);
 434                         environment.flags = active_flag;
 435                 }
 436
 437                 printf ("Done\n");
 438                 resid = DEVESIZE (otherdev) - CFG_ENV_SIZE;
 439                 if (resid) {
 440                         if ((data = malloc (resid)) == NULL) {
 441                                 fprintf (stderr,
 442                                         "Cannot malloc %d bytes: %s\n",
 443                                         resid,
 444                                         strerror (errno));
 445                                 return (-1);
 446                         }
 447                         if (lseek (fdr, DEVOFFSET (otherdev) + CFG_ENV_SIZE, SEEK_SET)
 448                                 == -1) {
 449                                 fprintf (stderr, "seek error on %s: %s\n",
 450                                         DEVNAME (otherdev),
 451                                         strerror (errno));
 452                                 return (-1);
 453                         }
 454                         if ((rc = read (fdr, data, resid)) != resid) {
 455                                 fprintf (stderr,
 456                                         "read error on %s: %s\n",
 457                                         DEVNAME (otherdev),
 458                                         strerror (errno));
 459                                 return (-1);
 460                         }
 461                 }
 462
 463                 printf ("Erasing old environment...\n");
 464
 465                 erase.length = DEVESIZE (otherdev);
 466                 erase.start = DEVOFFSET (otherdev);
 467                 if (ioctl (fdr, MEMERASE, &erase) != 0) {
 468                         fprintf (stderr, "MTD erase error on %s: %s\n",
 469                                 DEVNAME (otherdev),
 470                                 strerror (errno));
 471                         return (-1);
 472                 }
 473
 474                 printf ("Done\n");
 475
 476                 printf ("Writing environment to %s...\n", DEVNAME (otherdev));
 477                 if (lseek (fdr, DEVOFFSET (otherdev), SEEK_SET) == -1) {
 478                         fprintf (stderr,
 479                                 "seek error on %s: %s\n",
 480                                 DEVNAME (otherdev), strerror (errno));
 481                         return (-1);
 482                 }
 483                 if (write (fdr, &environment, len) != len) {
 484                         fprintf (stderr,
 485                                 "CRC write error on %s: %s\n",
 486                                 DEVNAME (otherdev), strerror (errno));
 487                         return (-1);
 488                 }
 489                 if (write (fdr, environment.data, ENV_SIZE) != ENV_SIZE) {
 490                         fprintf (stderr,
 491                                 "Write error on %s: %s\n",
 492                                 DEVNAME (otherdev), strerror (errno));
 493                         return (-1);
 494                 }
 495                 if (resid) {
 496                         if (write (fdr, data, resid) != resid) {
 497                                 fprintf (stderr,
 498                                         "write error on %s: %s\n",
 499                                         DEVNAME (curdev), strerror (errno));
 500                                 return (-1);
 501                         }
 502                         free (data);
 503                 }
 504                 if (HaveRedundEnv) {
 505                         /* change flag on current active env partition */
 506                         if (lseek (fd, DEVOFFSET (curdev) + sizeof (ulong), SEEK_SET)
 507                                 == -1) {
 508                                 fprintf (stderr, "seek error on %s: %s\n",
 509                                         DEVNAME (curdev), strerror (errno));
 510                                 return (-1);
 511                         }
 512                         if (write (fd, &obsolete_flag, sizeof (obsolete_flag)) !=
 513                                 sizeof (obsolete_flag)) {
 514                                 fprintf (stderr,
 515                                         "Write error on %s: %s\n",
 516                                         DEVNAME (curdev), strerror (errno));
 517                                 return (-1);
 518                         }
 519                 }
 520                 printf ("Done\n");
 521                 printf ("Locking ...\n");
 522                 erase.length = DEVESIZE (otherdev);
 523                 erase.start = DEVOFFSET (otherdev);
 524                 ioctl (fdr, MEMLOCK, &erase);
 525                 if (HaveRedundEnv) {
 526                         erase.length = DEVESIZE (curdev);
 527                         erase.start = DEVOFFSET (curdev);
 528                         ioctl (fd, MEMLOCK, &erase);
 529                         if (close (fdr)) {
 530                                 fprintf (stderr,
 531                                         "I/O error on %s: %s\n",
 532                                         DEVNAME (otherdev),
 533                                         strerror (errno));
 534                                 return (-1);
 535                         }
 536                 }
 537                 printf ("Done\n");
 538         } else {
 539
 540                 if (lseek (fd, DEVOFFSET (curdev), SEEK_SET) == -1) {
 541                         fprintf (stderr,
 542                                 "seek error on %s: %s\n",
 543                                 DEVNAME (curdev), strerror (errno));
 544                         return (-1);
 545                 }
 546                 if (read (fd, &environment, len) != len) {
 547                         fprintf (stderr,
 548                                 "CRC read error on %s: %s\n",
 549                                 DEVNAME (curdev), strerror (errno));
 550                         return (-1);
 551                 }
 552                 if ((rc = read (fd, environment.data, ENV_SIZE)) != ENV_SIZE) {
 553                         fprintf (stderr,
 554                                 "Read error on %s: %s\n",
 555                                 DEVNAME (curdev), strerror (errno));
 556                         return (-1);
 557                 }
 558         }
 559
 560         if (close (fd)) {
 561                 fprintf (stderr,
 562                         "I/O error on %s: %s\n",
 563                         DEVNAME (curdev), strerror (errno));
 564                 return (-1);
 565         }
 566
 567         /* everything ok */
 568         return (0);
 569 }
 570
 571 /*
 572  * s1 is either a simple 'name', or a 'name=value' pair.
 573  * s2 is a 'name=value' pair.
 574  * If the names match, return the value of s2, else NULL.
 575  */
 576
 577 static char *envmatch (char * s1, char * s2)
 578 {
 579
 580         while (*s1 == *s2++)
 581                 if (*s1++ == '=')
 582                         return (s2);
 583         if (*s1 == '\0' && *(s2 - 1) == '=')
 584                 return (s2);
 585         return (NULL);
 586 }
 587
 588 /*
 589  * Prevent confusion if running from erased flash memory
 590  */
 591 static int env_init (void)
 592 {
 593         int crc1, crc1_ok;
 594         char *addr1;
 595
 596         int crc2, crc2_ok;
 597         char flag1, flag2, *addr2;
 598
 599         if (parse_config ())            /* should fill envdevices */
 600                 return 1;
 601
 602         if ((addr1 = calloc (1, ENV_SIZE)) == NULL) {
 603                 fprintf (stderr,
 604                         "Not enough memory for environment (%ld bytes)\n",
 605                         ENV_SIZE);
 606                 return (errno);
 607         }
 608
 609         /* read environment from FLASH to local buffer */
 610         environment.data = addr1;
 611         curdev = 0;
 612         if (flash_io (O_RDONLY)) {
 613                 return (errno);
 614         }
 615
 616         crc1_ok = ((crc1 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE))
 617                            == environment.crc);
 618         if (!HaveRedundEnv) {
 619                 if (!crc1_ok) {
 620                         fprintf (stderr,
 621                                 "Warning: Bad CRC, using default environment\n");
 622                         memcpy(environment.data, default_environment, sizeof default_environment);
 623                 }
 624         } else {
 625                 flag1 = environment.flags;
 626
 627                 curdev = 1;
 628                 if ((addr2 = calloc (1, ENV_SIZE)) == NULL) {
 629                         fprintf (stderr,
 630                                 "Not enough memory for environment (%ld bytes)\n",
 631                                 ENV_SIZE);
 632                         return (errno);
 633                 }
 634                 environment.data = addr2;
 635
 636                 if (flash_io (O_RDONLY)) {
 637                         return (errno);
 638                 }
 639
 640                 crc2_ok = ((crc2 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE))
 641                                    == environment.crc);
 642                 flag2 = environment.flags;
 643
 644                 if (crc1_ok && !crc2_ok) {
 645                         environment.data = addr1;
 646                         environment.flags = flag1;
 647                         environment.crc = crc1;
 648                         curdev = 0;
 649                         free (addr2);
 650                 } else if (!crc1_ok && crc2_ok) {
 651                         environment.data = addr2;
 652                         environment.flags = flag2;
 653                         environment.crc = crc2;
 654                         curdev = 1;
 655                         free (addr1);
 656                 } else if (!crc1_ok && !crc2_ok) {
 657                         fprintf (stderr,
 658                                 "Warning: Bad CRC, using default environment\n");
 659                         memcpy(environment.data, default_environment, sizeof default_environment);
 660                         curdev = 0;
 661                         free (addr1);
 662                 } else if (flag1 == active_flag && flag2 == obsolete_flag) {
 663                         environment.data = addr1;
 664                         environment.flags = flag1;
 665                         environment.crc = crc1;
 666                         curdev = 0;
 667                         free (addr2);
 668                 } else if (flag1 == obsolete_flag && flag2 == active_flag) {
 669                         environment.data = addr2;
 670                         environment.flags = flag2;
 671                         environment.crc = crc2;
 672                         curdev = 1;
 673                         free (addr1);
 674                 } else if (flag1 == flag2) {
 675                         environment.data = addr1;
 676                         environment.flags = flag1;
 677                         environment.crc = crc1;
 678                         curdev = 0;
 679                         free (addr2);
 680                 } else if (flag1 == 0xFF) {
 681                         environment.data = addr1;
 682                         environment.flags = flag1;
 683                         environment.crc = crc1;
 684                         curdev = 0;
 685                         free (addr2);
 686                 } else if (flag2 == 0xFF) {
 687                         environment.data = addr2;
 688                         environment.flags = flag2;
 689                         environment.crc = crc2;
 690                         curdev = 1;
 691                         free (addr1);
 692                 }
 693         }
 694         return (0);
 695 }
 696
 697
 698 static int parse_config ()
 699 {
 700         struct stat st;
 701
 702 #if defined(CONFIG_FILE)
 703         /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
 704         if (get_config (CONFIG_FILE)) {
 705                 fprintf (stderr,
 706                         "Cannot parse config file: %s\n", strerror (errno));
 707                 return 1;
 708         }
 709 #else
 710         strcpy (DEVNAME (0), DEVICE1_NAME);
 711         DEVOFFSET (0) = DEVICE1_OFFSET;
 712         ENVSIZE (0) = ENV1_SIZE;
 713         DEVESIZE (0) = DEVICE1_ESIZE;
 714 #ifdef HAVE_REDUND
 715         strcpy (DEVNAME (1), DEVICE2_NAME);
 716         DEVOFFSET (1) = DEVICE2_OFFSET;
 717         ENVSIZE (1) = ENV2_SIZE;
 718         DEVESIZE (1) = DEVICE2_ESIZE;
 719         HaveRedundEnv = 1;
 720 #endif
 721 #endif
 722         if (stat (DEVNAME (0), &st)) {
 723                 fprintf (stderr,
 724                         "Cannot access MTD device %s: %s\n",
 725                         DEVNAME (0), strerror (errno));
 726                 return 1;
 727         }
 728
 729         if (HaveRedundEnv && stat (DEVNAME (1), &st)) {
 730                 fprintf (stderr,
 731                         "Cannot access MTD device %s: %s\n",
 732                         DEVNAME (1), strerror (errno));
 733                 return 1;
 734         }
 735         return 0;
 736 }
 737
 738 #if defined(CONFIG_FILE)
 739 static int get_config (char *fname)
 740 {
 741         FILE *fp;
 742         int i = 0;
 743         int rc;
 744         char dump[128];
 745
 746         if ((fp = fopen (fname, "r")) == NULL) {
 747                 return 1;
 748         }
 749
 750         while ((i < 2) && ((rc = fscanf (fp, "%s %lx %lx %lx",
 751                                   DEVNAME (i),
 752                                   &DEVOFFSET (i),
 753                                   &ENVSIZE (i),
 754                                   &DEVESIZE (i)  )) != EOF)) {
 755
 756                 /* Skip incomplete conversions and comment strings */
 757                 if ((rc < 3) || (*DEVNAME (i) == '#')) {
 758                         fgets (dump, sizeof (dump), fp);        /* Consume till end */
 759                         continue;
 760                 }
 761
 762                 i++;
 763         }
 764         fclose (fp);
 765
 766         HaveRedundEnv = i - 1;
 767         if (!i) {                       /* No valid entries found */
 768                 errno = EINVAL;
 769                 return 1;
 770         } else
 771                 return 0;
 772 }
 773 #endif