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-rw-r--r--roms/u-boot/tools/env/fw_env.c1842
1 files changed, 1842 insertions, 0 deletions
diff --git a/roms/u-boot/tools/env/fw_env.c b/roms/u-boot/tools/env/fw_env.c
new file mode 100644
index 000000000..2a61a5d6f
--- /dev/null
+++ b/roms/u-boot/tools/env/fw_env.c
@@ -0,0 +1,1842 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2008
+ * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.de.
+ */
+
+#define _GNU_SOURCE
+
+#include <compiler.h>
+#include <env.h>
+#include <errno.h>
+#include <env_flags.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <linux/fs.h>
+#include <linux/stringify.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <u-boot/crc.h>
+#include <unistd.h>
+#include <dirent.h>
+
+#ifdef MTD_OLD
+# include <stdint.h>
+# include <linux/mtd/mtd.h>
+#else
+# define __user /* nothing */
+# include <mtd/mtd-user.h>
+#endif
+
+#include <mtd/ubi-user.h>
+
+#include "fw_env_private.h"
+#include "fw_env.h"
+
+struct env_opts default_opts = {
+#ifdef CONFIG_FILE
+ .config_file = CONFIG_FILE
+#endif
+};
+
+#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
+
+#define min(x, y) ({ \
+ typeof(x) _min1 = (x); \
+ typeof(y) _min2 = (y); \
+ (void) (&_min1 == &_min2); \
+ _min1 < _min2 ? _min1 : _min2; })
+
+struct envdev_s {
+ const char *devname; /* Device name */
+ long long devoff; /* Device offset */
+ ulong env_size; /* environment size */
+ ulong erase_size; /* device erase size */
+ ulong env_sectors; /* number of environment sectors */
+ uint8_t mtd_type; /* type of the MTD device */
+ int is_ubi; /* set if we use UBI volume */
+};
+
+static struct envdev_s envdevices[2] = {
+ {
+ .mtd_type = MTD_ABSENT,
+ }, {
+ .mtd_type = MTD_ABSENT,
+ },
+};
+
+static int dev_current;
+
+#define DEVNAME(i) envdevices[(i)].devname
+#define DEVOFFSET(i) envdevices[(i)].devoff
+#define ENVSIZE(i) envdevices[(i)].env_size
+#define DEVESIZE(i) envdevices[(i)].erase_size
+#define ENVSECTORS(i) envdevices[(i)].env_sectors
+#define DEVTYPE(i) envdevices[(i)].mtd_type
+#define IS_UBI(i) envdevices[(i)].is_ubi
+
+#define CUR_ENVSIZE ENVSIZE(dev_current)
+
+static unsigned long usable_envsize;
+#define ENV_SIZE usable_envsize
+
+struct env_image_single {
+ uint32_t crc; /* CRC32 over data bytes */
+ char data[];
+};
+
+struct env_image_redundant {
+ uint32_t crc; /* CRC32 over data bytes */
+ unsigned char flags; /* active or obsolete */
+ char data[];
+};
+
+enum flag_scheme {
+ FLAG_NONE,
+ FLAG_BOOLEAN,
+ FLAG_INCREMENTAL,
+};
+
+struct environment {
+ void *image;
+ uint32_t *crc;
+ unsigned char *flags;
+ char *data;
+ enum flag_scheme flag_scheme;
+ int dirty;
+};
+
+static struct environment environment = {
+ .flag_scheme = FLAG_NONE,
+};
+
+static int have_redund_env;
+
+#define DEFAULT_ENV_INSTANCE_STATIC
+#include <env_default.h>
+
+#define UBI_DEV_START "/dev/ubi"
+#define UBI_SYSFS "/sys/class/ubi"
+#define UBI_VOL_NAME_PATT "ubi%d_%d"
+
+static int is_ubi_devname(const char *devname)
+{
+ return !strncmp(devname, UBI_DEV_START, sizeof(UBI_DEV_START) - 1);
+}
+
+static int ubi_check_volume_sysfs_name(const char *volume_sysfs_name,
+ const char *volname)
+{
+ char path[256];
+ FILE *file;
+ char *name;
+ int ret;
+
+ strcpy(path, UBI_SYSFS "/");
+ strcat(path, volume_sysfs_name);
+ strcat(path, "/name");
+
+ file = fopen(path, "r");
+ if (!file)
+ return -1;
+
+ ret = fscanf(file, "%ms", &name);
+ fclose(file);
+ if (ret <= 0 || !name) {
+ fprintf(stderr,
+ "Failed to read from file %s, ret = %d, name = %s\n",
+ path, ret, name);
+ return -1;
+ }
+
+ if (!strcmp(name, volname)) {
+ free(name);
+ return 0;
+ }
+ free(name);
+
+ return -1;
+}
+
+static int ubi_get_volnum_by_name(int devnum, const char *volname)
+{
+ DIR *sysfs_ubi;
+ struct dirent *dirent;
+ int ret;
+ int tmp_devnum;
+ int volnum;
+
+ sysfs_ubi = opendir(UBI_SYSFS);
+ if (!sysfs_ubi)
+ return -1;
+
+#ifdef DEBUG
+ fprintf(stderr, "Looking for volume name \"%s\"\n", volname);
+#endif
+
+ while (1) {
+ dirent = readdir(sysfs_ubi);
+ if (!dirent)
+ return -1;
+
+ ret = sscanf(dirent->d_name, UBI_VOL_NAME_PATT,
+ &tmp_devnum, &volnum);
+ if (ret == 2 && devnum == tmp_devnum) {
+ if (ubi_check_volume_sysfs_name(dirent->d_name,
+ volname) == 0)
+ return volnum;
+ }
+ }
+
+ return -1;
+}
+
+static int ubi_get_devnum_by_devname(const char *devname)
+{
+ int devnum;
+ int ret;
+
+ ret = sscanf(devname + sizeof(UBI_DEV_START) - 1, "%d", &devnum);
+ if (ret != 1)
+ return -1;
+
+ return devnum;
+}
+
+static const char *ubi_get_volume_devname(const char *devname,
+ const char *volname)
+{
+ char *volume_devname;
+ int volnum;
+ int devnum;
+ int ret;
+
+ devnum = ubi_get_devnum_by_devname(devname);
+ if (devnum < 0)
+ return NULL;
+
+ volnum = ubi_get_volnum_by_name(devnum, volname);
+ if (volnum < 0)
+ return NULL;
+
+ ret = asprintf(&volume_devname, "%s_%d", devname, volnum);
+ if (ret < 0)
+ return NULL;
+
+#ifdef DEBUG
+ fprintf(stderr, "Found ubi volume \"%s:%s\" -> %s\n",
+ devname, volname, volume_devname);
+#endif
+
+ return volume_devname;
+}
+
+static void ubi_check_dev(unsigned int dev_id)
+{
+ char *devname = (char *)DEVNAME(dev_id);
+ char *pname;
+ const char *volname = NULL;
+ const char *volume_devname;
+
+ if (!is_ubi_devname(DEVNAME(dev_id)))
+ return;
+
+ IS_UBI(dev_id) = 1;
+
+ for (pname = devname; *pname != '\0'; pname++) {
+ if (*pname == ':') {
+ *pname = '\0';
+ volname = pname + 1;
+ break;
+ }
+ }
+
+ if (volname) {
+ /* Let's find real volume device name */
+ volume_devname = ubi_get_volume_devname(devname, volname);
+ if (!volume_devname) {
+ fprintf(stderr, "Didn't found ubi volume \"%s\"\n",
+ volname);
+ return;
+ }
+
+ free(devname);
+ DEVNAME(dev_id) = volume_devname;
+ }
+}
+
+static int ubi_update_start(int fd, int64_t bytes)
+{
+ if (ioctl(fd, UBI_IOCVOLUP, &bytes))
+ return -1;
+ return 0;
+}
+
+static int ubi_read(int fd, void *buf, size_t count)
+{
+ ssize_t ret;
+
+ while (count > 0) {
+ ret = read(fd, buf, count);
+ if (ret > 0) {
+ count -= ret;
+ buf += ret;
+
+ continue;
+ }
+
+ if (ret == 0) {
+ /*
+ * Happens in case of too short volume data size. If we
+ * return error status we will fail it will be treated
+ * as UBI device error.
+ *
+ * Leave catching this error to CRC check.
+ */
+ fprintf(stderr, "Warning: end of data on ubi volume\n");
+ return 0;
+ } else if (errno == EBADF) {
+ /*
+ * Happens in case of corrupted volume. The same as
+ * above, we cannot return error now, as we will still
+ * be able to successfully write environment later.
+ */
+ fprintf(stderr, "Warning: corrupted volume?\n");
+ return 0;
+ } else if (errno == EINTR) {
+ continue;
+ }
+
+ fprintf(stderr, "Cannot read %u bytes from ubi volume, %s\n",
+ (unsigned int)count, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int ubi_write(int fd, const void *buf, size_t count)
+{
+ ssize_t ret;
+
+ while (count > 0) {
+ ret = write(fd, buf, count);
+ if (ret <= 0) {
+ if (ret < 0 && errno == EINTR)
+ continue;
+
+ fprintf(stderr, "Cannot write %u bytes to ubi volume\n",
+ (unsigned int)count);
+ return -1;
+ }
+
+ count -= ret;
+ buf += ret;
+ }
+
+ return 0;
+}
+
+static int flash_io(int mode);
+static int parse_config(struct env_opts *opts);
+
+#if defined(CONFIG_FILE)
+static int get_config(char *);
+#endif
+
+static char *skip_chars(char *s)
+{
+ for (; *s != '\0'; s++) {
+ if (isblank(*s) || *s == '=')
+ return s;
+ }
+ return NULL;
+}
+
+static char *skip_blanks(char *s)
+{
+ for (; *s != '\0'; s++) {
+ if (!isblank(*s))
+ return s;
+ }
+ return NULL;
+}
+
+/*
+ * s1 is either a simple 'name', or a 'name=value' pair.
+ * s2 is a 'name=value' pair.
+ * If the names match, return the value of s2, else NULL.
+ */
+static char *envmatch(char *s1, char *s2)
+{
+ if (s1 == NULL || s2 == NULL)
+ return NULL;
+
+ while (*s1 == *s2++)
+ if (*s1++ == '=')
+ return s2;
+ if (*s1 == '\0' && *(s2 - 1) == '=')
+ return s2;
+ return NULL;
+}
+
+/**
+ * Search the environment for a variable.
+ * Return the value, if found, or NULL, if not found.
+ */
+char *fw_getenv(char *name)
+{
+ char *env, *nxt;
+
+ for (env = environment.data; *env; env = nxt + 1) {
+ char *val;
+
+ for (nxt = env; *nxt; ++nxt) {
+ if (nxt >= &environment.data[ENV_SIZE]) {
+ fprintf(stderr, "## Error: "
+ "environment not terminated\n");
+ return NULL;
+ }
+ }
+ val = envmatch(name, env);
+ if (!val)
+ continue;
+ return val;
+ }
+ return NULL;
+}
+
+/*
+ * Search the default environment for a variable.
+ * Return the value, if found, or NULL, if not found.
+ */
+char *fw_getdefenv(char *name)
+{
+ char *env, *nxt;
+
+ for (env = default_environment; *env; env = nxt + 1) {
+ char *val;
+
+ for (nxt = env; *nxt; ++nxt) {
+ if (nxt >= &default_environment[ENV_SIZE]) {
+ fprintf(stderr, "## Error: "
+ "default environment not terminated\n");
+ return NULL;
+ }
+ }
+ val = envmatch(name, env);
+ if (!val)
+ continue;
+ return val;
+ }
+ return NULL;
+}
+
+/*
+ * Print the current definition of one, or more, or all
+ * environment variables
+ */
+int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts)
+{
+ int i, rc = 0;
+
+ if (value_only && argc != 1) {
+ fprintf(stderr,
+ "## Error: `-n'/`--noheader' option requires exactly one argument\n");
+ return -1;
+ }
+
+ if (!opts)
+ opts = &default_opts;
+
+ if (fw_env_open(opts))
+ return -1;
+
+ if (argc == 0) { /* Print all env variables */
+ char *env, *nxt;
+ for (env = environment.data; *env; env = nxt + 1) {
+ for (nxt = env; *nxt; ++nxt) {
+ if (nxt >= &environment.data[ENV_SIZE]) {
+ fprintf(stderr, "## Error: "
+ "environment not terminated\n");
+ return -1;
+ }
+ }
+
+ printf("%s\n", env);
+ }
+ fw_env_close(opts);
+ return 0;
+ }
+
+ for (i = 0; i < argc; ++i) { /* print a subset of env variables */
+ char *name = argv[i];
+ char *val = NULL;
+
+ val = fw_getenv(name);
+ if (!val) {
+ fprintf(stderr, "## Error: \"%s\" not defined\n", name);
+ rc = -1;
+ continue;
+ }
+
+ if (value_only) {
+ puts(val);
+ break;
+ }
+
+ printf("%s=%s\n", name, val);
+ }
+
+ fw_env_close(opts);
+
+ return rc;
+}
+
+int fw_env_flush(struct env_opts *opts)
+{
+ if (!opts)
+ opts = &default_opts;
+
+ if (!environment.dirty)
+ return 0;
+
+ /*
+ * Update CRC
+ */
+ *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
+
+ /* write environment back to flash */
+ if (flash_io(O_RDWR)) {
+ fprintf(stderr, "Error: can't write fw_env to flash\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Set/Clear a single variable in the environment.
+ * This is called in sequence to update the environment
+ * in RAM without updating the copy in flash after each set
+ */
+int fw_env_write(char *name, char *value)
+{
+ int len;
+ char *env, *nxt;
+ char *oldval = NULL;
+ int deleting, creating, overwriting;
+
+ /*
+ * search if variable with this name already exists
+ */
+ for (nxt = env = environment.data; *env; env = nxt + 1) {
+ for (nxt = env; *nxt; ++nxt) {
+ if (nxt >= &environment.data[ENV_SIZE]) {
+ fprintf(stderr, "## Error: "
+ "environment not terminated\n");
+ errno = EINVAL;
+ return -1;
+ }
+ }
+ oldval = envmatch(name, env);
+ if (oldval)
+ break;
+ }
+
+ deleting = (oldval && !(value && strlen(value)));
+ creating = (!oldval && (value && strlen(value)));
+ overwriting = (oldval && (value && strlen(value) &&
+ strcmp(oldval, value)));
+
+ /* check for permission */
+ if (deleting) {
+ if (env_flags_validate_varaccess(name,
+ ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
+ printf("Can't delete \"%s\"\n", name);
+ errno = EROFS;
+ return -1;
+ }
+ } else if (overwriting) {
+ if (env_flags_validate_varaccess(name,
+ ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
+ printf("Can't overwrite \"%s\"\n", name);
+ errno = EROFS;
+ return -1;
+ } else if (env_flags_validate_varaccess(name,
+ ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
+ const char *defval = fw_getdefenv(name);
+
+ if (defval == NULL)
+ defval = "";
+ if (strcmp(oldval, defval)
+ != 0) {
+ printf("Can't overwrite \"%s\"\n", name);
+ errno = EROFS;
+ return -1;
+ }
+ }
+ } else if (creating) {
+ if (env_flags_validate_varaccess(name,
+ ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
+ printf("Can't create \"%s\"\n", name);
+ errno = EROFS;
+ return -1;
+ }
+ } else
+ /* Nothing to do */
+ return 0;
+
+ environment.dirty = 1;
+ if (deleting || overwriting) {
+ if (*++nxt == '\0') {
+ *env = '\0';
+ } else {
+ for (;;) {
+ *env = *nxt++;
+ if ((*env == '\0') && (*nxt == '\0'))
+ break;
+ ++env;
+ }
+ }
+ *++env = '\0';
+ }
+
+ /* Delete only ? */
+ if (!value || !strlen(value))
+ return 0;
+
+ /*
+ * Append new definition at the end
+ */
+ for (env = environment.data; *env || *(env + 1); ++env)
+ ;
+ if (env > environment.data)
+ ++env;
+ /*
+ * Overflow when:
+ * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
+ */
+ len = strlen(name) + 2;
+ /* add '=' for first arg, ' ' for all others */
+ len += strlen(value) + 1;
+
+ if (len > (&environment.data[ENV_SIZE] - env)) {
+ fprintf(stderr,
+ "Error: environment overflow, \"%s\" deleted\n", name);
+ return -1;
+ }
+
+ while ((*env = *name++) != '\0')
+ env++;
+ *env = '=';
+ while ((*++env = *value++) != '\0')
+ ;
+
+ /* end is marked with double '\0' */
+ *++env = '\0';
+
+ return 0;
+}
+
+/*
+ * Deletes or sets environment variables. Returns -1 and sets errno error codes:
+ * 0 - OK
+ * EINVAL - need at least 1 argument
+ * EROFS - certain variables ("ethaddr", "serial#") cannot be
+ * modified or deleted
+ *
+ */
+int fw_env_set(int argc, char *argv[], struct env_opts *opts)
+{
+ int i;
+ size_t len;
+ char *name, **valv;
+ char *oldval;
+ char *value = NULL;
+ int valc;
+ int ret;
+
+ if (!opts)
+ opts = &default_opts;
+
+ if (argc < 1) {
+ fprintf(stderr, "## Error: variable name missing\n");
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (fw_env_open(opts)) {
+ fprintf(stderr, "Error: environment not initialized\n");
+ return -1;
+ }
+
+ name = argv[0];
+ valv = argv + 1;
+ valc = argc - 1;
+
+ if (env_flags_validate_env_set_params(name, valv, valc) < 0) {
+ fw_env_close(opts);
+ return -1;
+ }
+
+ len = 0;
+ for (i = 0; i < valc; ++i) {
+ char *val = valv[i];
+ size_t val_len = strlen(val);
+
+ if (value)
+ value[len - 1] = ' ';
+ oldval = value;
+ value = realloc(value, len + val_len + 1);
+ if (!value) {
+ fprintf(stderr,
+ "Cannot malloc %zu bytes: %s\n",
+ len, strerror(errno));
+ free(oldval);
+ return -1;
+ }
+
+ memcpy(value + len, val, val_len);
+ len += val_len;
+ value[len++] = '\0';
+ }
+
+ fw_env_write(name, value);
+
+ free(value);
+
+ ret = fw_env_flush(opts);
+ fw_env_close(opts);
+
+ return ret;
+}
+
+/*
+ * Parse a file and configure the u-boot variables.
+ * The script file has a very simple format, as follows:
+ *
+ * Each line has a couple with name, value:
+ * <white spaces>variable_name<white spaces>variable_value
+ *
+ * Both variable_name and variable_value are interpreted as strings.
+ * Any character after <white spaces> and before ending \r\n is interpreted
+ * as variable's value (no comment allowed on these lines !)
+ *
+ * Comments are allowed if the first character in the line is #
+ *
+ * Returns -1 and sets errno error codes:
+ * 0 - OK
+ * -1 - Error
+ */
+int fw_parse_script(char *fname, struct env_opts *opts)
+{
+ FILE *fp;
+ char *line = NULL;
+ size_t linesize = 0;
+ char *name;
+ char *val;
+ int lineno = 0;
+ int len;
+ int ret = 0;
+
+ if (!opts)
+ opts = &default_opts;
+
+ if (fw_env_open(opts)) {
+ fprintf(stderr, "Error: environment not initialized\n");
+ return -1;
+ }
+
+ if (strcmp(fname, "-") == 0)
+ fp = stdin;
+ else {
+ fp = fopen(fname, "r");
+ if (fp == NULL) {
+ fprintf(stderr, "I cannot open %s for reading\n",
+ fname);
+ return -1;
+ }
+ }
+
+ while ((len = getline(&line, &linesize, fp)) != -1) {
+ lineno++;
+
+ /*
+ * Read a whole line from the file. If the line is not
+ * terminated, reports an error and exit.
+ */
+ if (line[len - 1] != '\n') {
+ fprintf(stderr,
+ "Line %d not correctly terminated\n",
+ lineno);
+ ret = -1;
+ break;
+ }
+
+ /* Drop ending line feed / carriage return */
+ line[--len] = '\0';
+ if (len && line[len - 1] == '\r')
+ line[--len] = '\0';
+
+ /* Skip comment or empty lines */
+ if (len == 0 || line[0] == '#')
+ continue;
+
+ /*
+ * Search for variable's name remove leading whitespaces
+ */
+ name = skip_blanks(line);
+ if (!name)
+ continue;
+
+ /* The first white space is the end of variable name */
+ val = skip_chars(name);
+ len = strlen(name);
+ if (val) {
+ *val++ = '\0';
+ if ((val - name) < len)
+ val = skip_blanks(val);
+ else
+ val = NULL;
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Setting %s : %s\n",
+ name, val ? val : " removed");
+#endif
+
+ if (env_flags_validate_type(name, val) < 0) {
+ ret = -1;
+ break;
+ }
+
+ /*
+ * If there is an error setting a variable,
+ * try to save the environment and returns an error
+ */
+ if (fw_env_write(name, val)) {
+ fprintf(stderr,
+ "fw_env_write returns with error : %s\n",
+ strerror(errno));
+ ret = -1;
+ break;
+ }
+
+ }
+ free(line);
+
+ /* Close file if not stdin */
+ if (strcmp(fname, "-") != 0)
+ fclose(fp);
+
+ ret |= fw_env_flush(opts);
+
+ fw_env_close(opts);
+
+ return ret;
+}
+
+/**
+ * environment_end() - compute offset of first byte right after environment
+ * @dev - index of enviroment buffer
+ * Return:
+ * device offset of first byte right after environment
+ */
+off_t environment_end(int dev)
+{
+ /* environment is block aligned */
+ return DEVOFFSET(dev) + ENVSECTORS(dev) * DEVESIZE(dev);
+}
+
+/*
+ * Test for bad block on NAND, just returns 0 on NOR, on NAND:
+ * 0 - block is good
+ * > 0 - block is bad
+ * < 0 - failed to test
+ */
+static int flash_bad_block(int fd, uint8_t mtd_type, loff_t blockstart)
+{
+ if (mtd_type == MTD_NANDFLASH) {
+ int badblock = ioctl(fd, MEMGETBADBLOCK, &blockstart);
+
+ if (badblock < 0) {
+ perror("Cannot read bad block mark");
+ return badblock;
+ }
+
+ if (badblock) {
+#ifdef DEBUG
+ fprintf(stderr, "Bad block at 0x%llx, skipping\n",
+ (unsigned long long)blockstart);
+#endif
+ return badblock;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Read data from flash at an offset into a provided buffer. On NAND it skips
+ * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
+ * the DEVOFFSET (dev) block. On NOR the loop is only run once.
+ */
+static int flash_read_buf(int dev, int fd, void *buf, size_t count,
+ off_t offset)
+{
+ size_t blocklen; /* erase / write length - one block on NAND,
+ 0 on NOR */
+ size_t processed = 0; /* progress counter */
+ size_t readlen = count; /* current read length */
+ off_t block_seek; /* offset inside the current block to the start
+ of the data */
+ loff_t blockstart; /* running start of the current block -
+ MEMGETBADBLOCK needs 64 bits */
+ int rc;
+
+ blockstart = (offset / DEVESIZE(dev)) * DEVESIZE(dev);
+
+ /* Offset inside a block */
+ block_seek = offset - blockstart;
+
+ if (DEVTYPE(dev) == MTD_NANDFLASH) {
+ /*
+ * NAND: calculate which blocks we are reading. We have
+ * to read one block at a time to skip bad blocks.
+ */
+ blocklen = DEVESIZE(dev);
+
+ /* Limit to one block for the first read */
+ if (readlen > blocklen - block_seek)
+ readlen = blocklen - block_seek;
+ } else {
+ blocklen = 0;
+ }
+
+ /* This only runs once on NOR flash */
+ while (processed < count) {
+ rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
+ if (rc < 0) /* block test failed */
+ return -1;
+
+ if (blockstart + block_seek + readlen > environment_end(dev)) {
+ /* End of range is reached */
+ fprintf(stderr, "Too few good blocks within range\n");
+ return -1;
+ }
+
+ if (rc) { /* block is bad */
+ blockstart += blocklen;
+ continue;
+ }
+
+ /*
+ * If a block is bad, we retry in the next block at the same
+ * offset - see env/nand.c::writeenv()
+ */
+ lseek(fd, blockstart + block_seek, SEEK_SET);
+
+ rc = read(fd, buf + processed, readlen);
+ if (rc == -1) {
+ fprintf(stderr, "Read error on %s: %s\n",
+ DEVNAME(dev), strerror(errno));
+ return -1;
+ }
+ if (rc != readlen) {
+ fprintf(stderr,
+ "Read error on %s: Attempted to read %zd bytes but got %d\n",
+ DEVNAME(dev), readlen, rc);
+ return -1;
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
+ rc, (unsigned long long)blockstart + block_seek,
+ DEVNAME(dev));
+#endif
+ processed += readlen;
+ readlen = min(blocklen, count - processed);
+ block_seek = 0;
+ blockstart += blocklen;
+ }
+
+ return processed;
+}
+
+/*
+ * Write count bytes from begin of environment, but stay within
+ * ENVSECTORS(dev) sectors of
+ * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
+ * erase and write the whole data at once.
+ */
+static int flash_write_buf(int dev, int fd, void *buf, size_t count)
+{
+ void *data;
+ struct erase_info_user erase;
+ size_t blocklen; /* length of NAND block / NOR erase sector */
+ size_t erase_len; /* whole area that can be erased - may include
+ bad blocks */
+ size_t erasesize; /* erase / write length - one block on NAND,
+ whole area on NOR */
+ size_t processed = 0; /* progress counter */
+ size_t write_total; /* total size to actually write - excluding
+ bad blocks */
+ off_t erase_offset; /* offset to the first erase block (aligned)
+ below offset */
+ off_t block_seek; /* offset inside the erase block to the start
+ of the data */
+ loff_t blockstart; /* running start of the current block -
+ MEMGETBADBLOCK needs 64 bits */
+ int was_locked = 0; /* flash lock flag */
+ int rc;
+
+ /*
+ * For mtd devices only offset and size of the environment do matter
+ */
+ if (DEVTYPE(dev) == MTD_ABSENT) {
+ blocklen = count;
+ erase_len = blocklen;
+ blockstart = DEVOFFSET(dev);
+ block_seek = 0;
+ write_total = blocklen;
+ } else {
+ blocklen = DEVESIZE(dev);
+
+ erase_offset = DEVOFFSET(dev);
+
+ /* Maximum area we may use */
+ erase_len = environment_end(dev) - erase_offset;
+
+ blockstart = erase_offset;
+
+ /* Offset inside a block */
+ block_seek = DEVOFFSET(dev) - erase_offset;
+
+ /*
+ * Data size we actually write: from the start of the block
+ * to the start of the data, then count bytes of data, and
+ * to the end of the block
+ */
+ write_total = ((block_seek + count + blocklen - 1) /
+ blocklen) * blocklen;
+ }
+
+ /*
+ * Support data anywhere within erase sectors: read out the complete
+ * area to be erased, replace the environment image, write the whole
+ * block back again.
+ */
+ if (write_total > count) {
+ data = malloc(erase_len);
+ if (!data) {
+ fprintf(stderr,
+ "Cannot malloc %zu bytes: %s\n",
+ erase_len, strerror(errno));
+ return -1;
+ }
+
+ rc = flash_read_buf(dev, fd, data, write_total, erase_offset);
+ if (write_total != rc)
+ return -1;
+
+#ifdef DEBUG
+ fprintf(stderr, "Preserving data ");
+ if (block_seek != 0)
+ fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
+ if (block_seek + count != write_total) {
+ if (block_seek != 0)
+ fprintf(stderr, " and ");
+ fprintf(stderr, "0x%lx - 0x%lx",
+ (unsigned long)block_seek + count,
+ (unsigned long)write_total - 1);
+ }
+ fprintf(stderr, "\n");
+#endif
+ /* Overwrite the old environment */
+ memcpy(data + block_seek, buf, count);
+ } else {
+ /*
+ * We get here, iff offset is block-aligned and count is a
+ * multiple of blocklen - see write_total calculation above
+ */
+ data = buf;
+ }
+
+ if (DEVTYPE(dev) == MTD_NANDFLASH) {
+ /*
+ * NAND: calculate which blocks we are writing. We have
+ * to write one block at a time to skip bad blocks.
+ */
+ erasesize = blocklen;
+ } else {
+ erasesize = erase_len;
+ }
+
+ erase.length = erasesize;
+ if (DEVTYPE(dev) != MTD_ABSENT) {
+ was_locked = ioctl(fd, MEMISLOCKED, &erase);
+ /* treat any errors as unlocked flash */
+ if (was_locked < 0)
+ was_locked = 0;
+ }
+
+ /* This only runs once on NOR flash and SPI-dataflash */
+ while (processed < write_total) {
+ rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
+ if (rc < 0) /* block test failed */
+ return rc;
+
+ if (blockstart + erasesize > environment_end(dev)) {
+ fprintf(stderr, "End of range reached, aborting\n");
+ return -1;
+ }
+
+ if (rc) { /* block is bad */
+ blockstart += blocklen;
+ continue;
+ }
+
+ if (DEVTYPE(dev) != MTD_ABSENT) {
+ erase.start = blockstart;
+ if (was_locked)
+ ioctl(fd, MEMUNLOCK, &erase);
+ /* These do not need an explicit erase cycle */
+ if (DEVTYPE(dev) != MTD_DATAFLASH)
+ if (ioctl(fd, MEMERASE, &erase) != 0) {
+ fprintf(stderr,
+ "MTD erase error on %s: %s\n",
+ DEVNAME(dev), strerror(errno));
+ return -1;
+ }
+ }
+
+ if (lseek(fd, blockstart, SEEK_SET) == -1) {
+ fprintf(stderr,
+ "Seek error on %s: %s\n",
+ DEVNAME(dev), strerror(errno));
+ return -1;
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Write 0x%llx bytes at 0x%llx\n",
+ (unsigned long long)erasesize,
+ (unsigned long long)blockstart);
+#endif
+ if (write(fd, data + processed, erasesize) != erasesize) {
+ fprintf(stderr, "Write error on %s: %s\n",
+ DEVNAME(dev), strerror(errno));
+ return -1;
+ }
+
+ if (DEVTYPE(dev) != MTD_ABSENT) {
+ if (was_locked)
+ ioctl(fd, MEMLOCK, &erase);
+ }
+
+ processed += erasesize;
+ block_seek = 0;
+ blockstart += erasesize;
+ }
+
+ if (write_total > count)
+ free(data);
+
+ return processed;
+}
+
+/*
+ * Set obsolete flag at offset - NOR flash only
+ */
+static int flash_flag_obsolete(int dev, int fd, off_t offset)
+{
+ int rc;
+ struct erase_info_user erase;
+ char tmp = ENV_REDUND_OBSOLETE;
+ int was_locked; /* flash lock flag */
+
+ was_locked = ioctl(fd, MEMISLOCKED, &erase);
+ erase.start = DEVOFFSET(dev);
+ erase.length = DEVESIZE(dev);
+ /* This relies on the fact, that ENV_REDUND_OBSOLETE == 0 */
+ rc = lseek(fd, offset, SEEK_SET);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot seek to set the flag on %s\n",
+ DEVNAME(dev));
+ return rc;
+ }
+ if (was_locked)
+ ioctl(fd, MEMUNLOCK, &erase);
+ rc = write(fd, &tmp, sizeof(tmp));
+ if (was_locked)
+ ioctl(fd, MEMLOCK, &erase);
+ if (rc < 0)
+ perror("Could not set obsolete flag");
+
+ return rc;
+}
+
+static int flash_write(int fd_current, int fd_target, int dev_target)
+{
+ int rc;
+
+ switch (environment.flag_scheme) {
+ case FLAG_NONE:
+ break;
+ case FLAG_INCREMENTAL:
+ (*environment.flags)++;
+ break;
+ case FLAG_BOOLEAN:
+ *environment.flags = ENV_REDUND_ACTIVE;
+ break;
+ default:
+ fprintf(stderr, "Unimplemented flash scheme %u\n",
+ environment.flag_scheme);
+ return -1;
+ }
+
+#ifdef DEBUG
+ fprintf(stderr, "Writing new environment at 0x%llx on %s\n",
+ DEVOFFSET(dev_target), DEVNAME(dev_target));
+#endif
+
+ if (IS_UBI(dev_target)) {
+ if (ubi_update_start(fd_target, CUR_ENVSIZE) < 0)
+ return -1;
+ return ubi_write(fd_target, environment.image, CUR_ENVSIZE);
+ }
+
+ rc = flash_write_buf(dev_target, fd_target, environment.image,
+ CUR_ENVSIZE);
+ if (rc < 0)
+ return rc;
+
+ if (environment.flag_scheme == FLAG_BOOLEAN) {
+ /* Have to set obsolete flag */
+ off_t offset = DEVOFFSET(dev_current) +
+ offsetof(struct env_image_redundant, flags);
+#ifdef DEBUG
+ fprintf(stderr,
+ "Setting obsolete flag in environment at 0x%llx on %s\n",
+ DEVOFFSET(dev_current), DEVNAME(dev_current));
+#endif
+ flash_flag_obsolete(dev_current, fd_current, offset);
+ }
+
+ return 0;
+}
+
+static int flash_read(int fd)
+{
+ int rc;
+
+ if (IS_UBI(dev_current)) {
+ DEVTYPE(dev_current) = MTD_ABSENT;
+
+ return ubi_read(fd, environment.image, CUR_ENVSIZE);
+ }
+
+ rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
+ DEVOFFSET(dev_current));
+ if (rc != CUR_ENVSIZE)
+ return -1;
+
+ return 0;
+}
+
+static int flash_open_tempfile(const char **dname, const char **target_temp)
+{
+ char *dup_name = strdup(DEVNAME(dev_current));
+ char *temp_name = NULL;
+ int rc = -1;
+
+ if (!dup_name)
+ return -1;
+
+ *dname = dirname(dup_name);
+ if (!*dname)
+ goto err;
+
+ rc = asprintf(&temp_name, "%s/XXXXXX", *dname);
+ if (rc == -1)
+ goto err;
+
+ rc = mkstemp(temp_name);
+ if (rc == -1) {
+ /* fall back to in place write */
+ fprintf(stderr,
+ "Can't create %s: %s\n", temp_name, strerror(errno));
+ free(temp_name);
+ } else {
+ *target_temp = temp_name;
+ /* deliberately leak dup_name as dname /might/ point into
+ * it and we need it for our caller
+ */
+ dup_name = NULL;
+ }
+
+err:
+ if (dup_name)
+ free(dup_name);
+
+ return rc;
+}
+
+static int flash_io_write(int fd_current)
+{
+ int fd_target = -1, rc, dev_target;
+ const char *dname, *target_temp = NULL;
+
+ if (have_redund_env) {
+ /* switch to next partition for writing */
+ dev_target = !dev_current;
+ /* dev_target: fd_target, erase_target */
+ fd_target = open(DEVNAME(dev_target), O_RDWR);
+ if (fd_target < 0) {
+ fprintf(stderr,
+ "Can't open %s: %s\n",
+ DEVNAME(dev_target), strerror(errno));
+ rc = -1;
+ goto exit;
+ }
+ } else {
+ struct stat sb;
+
+ if (fstat(fd_current, &sb) == 0 && S_ISREG(sb.st_mode)) {
+ /* if any part of flash_open_tempfile() fails we fall
+ * back to in-place writes
+ */
+ fd_target = flash_open_tempfile(&dname, &target_temp);
+ }
+ dev_target = dev_current;
+ if (fd_target == -1)
+ fd_target = fd_current;
+ }
+
+ rc = flash_write(fd_current, fd_target, dev_target);
+
+ if (fsync(fd_current) && !(errno == EINVAL || errno == EROFS)) {
+ fprintf(stderr,
+ "fsync failed on %s: %s\n",
+ DEVNAME(dev_current), strerror(errno));
+ }
+
+ if (fd_current != fd_target) {
+ if (fsync(fd_target) &&
+ !(errno == EINVAL || errno == EROFS)) {
+ fprintf(stderr,
+ "fsync failed on %s: %s\n",
+ DEVNAME(dev_current), strerror(errno));
+ }
+
+ if (close(fd_target)) {
+ fprintf(stderr,
+ "I/O error on %s: %s\n",
+ DEVNAME(dev_target), strerror(errno));
+ rc = -1;
+ }
+
+ if (rc >= 0 && target_temp) {
+ int dir_fd;
+
+ dir_fd = open(dname, O_DIRECTORY | O_RDONLY);
+ if (dir_fd == -1)
+ fprintf(stderr,
+ "Can't open %s: %s\n",
+ dname, strerror(errno));
+
+ if (rename(target_temp, DEVNAME(dev_target))) {
+ fprintf(stderr,
+ "rename failed %s => %s: %s\n",
+ target_temp, DEVNAME(dev_target),
+ strerror(errno));
+ rc = -1;
+ }
+
+ if (dir_fd != -1 && fsync(dir_fd))
+ fprintf(stderr,
+ "fsync failed on %s: %s\n",
+ dname, strerror(errno));
+
+ if (dir_fd != -1 && close(dir_fd))
+ fprintf(stderr,
+ "I/O error on %s: %s\n",
+ dname, strerror(errno));
+ }
+ }
+ exit:
+ return rc;
+}
+
+static int flash_io(int mode)
+{
+ int fd_current, rc;
+
+ /* dev_current: fd_current, erase_current */
+ fd_current = open(DEVNAME(dev_current), mode);
+ if (fd_current < 0) {
+ fprintf(stderr,
+ "Can't open %s: %s\n",
+ DEVNAME(dev_current), strerror(errno));
+ return -1;
+ }
+
+ if (mode == O_RDWR) {
+ rc = flash_io_write(fd_current);
+ } else {
+ rc = flash_read(fd_current);
+ }
+
+ if (close(fd_current)) {
+ fprintf(stderr,
+ "I/O error on %s: %s\n",
+ DEVNAME(dev_current), strerror(errno));
+ return -1;
+ }
+
+ return rc;
+}
+
+/*
+ * Prevent confusion if running from erased flash memory
+ */
+int fw_env_open(struct env_opts *opts)
+{
+ int crc0, crc0_ok;
+ unsigned char flag0;
+ void *addr0 = NULL;
+
+ int crc1, crc1_ok;
+ unsigned char flag1;
+ void *addr1 = NULL;
+
+ int ret;
+
+ struct env_image_single *single;
+ struct env_image_redundant *redundant;
+
+ if (!opts)
+ opts = &default_opts;
+
+ if (parse_config(opts)) /* should fill envdevices */
+ return -EINVAL;
+
+ addr0 = calloc(1, CUR_ENVSIZE);
+ if (addr0 == NULL) {
+ fprintf(stderr,
+ "Not enough memory for environment (%ld bytes)\n",
+ CUR_ENVSIZE);
+ ret = -ENOMEM;
+ goto open_cleanup;
+ }
+
+ /* read environment from FLASH to local buffer */
+ environment.image = addr0;
+
+ if (have_redund_env) {
+ redundant = addr0;
+ environment.crc = &redundant->crc;
+ environment.flags = &redundant->flags;
+ environment.data = redundant->data;
+ } else {
+ single = addr0;
+ environment.crc = &single->crc;
+ environment.flags = NULL;
+ environment.data = single->data;
+ }
+
+ dev_current = 0;
+ if (flash_io(O_RDONLY)) {
+ ret = -EIO;
+ goto open_cleanup;
+ }
+
+ crc0 = crc32(0, (uint8_t *)environment.data, ENV_SIZE);
+
+ crc0_ok = (crc0 == *environment.crc);
+ if (!have_redund_env) {
+ if (!crc0_ok) {
+ fprintf(stderr,
+ "Warning: Bad CRC, using default environment\n");
+ memcpy(environment.data, default_environment,
+ sizeof(default_environment));
+ environment.dirty = 1;
+ }
+ } else {
+ flag0 = *environment.flags;
+
+ dev_current = 1;
+ addr1 = calloc(1, CUR_ENVSIZE);
+ if (addr1 == NULL) {
+ fprintf(stderr,
+ "Not enough memory for environment (%ld bytes)\n",
+ CUR_ENVSIZE);
+ ret = -ENOMEM;
+ goto open_cleanup;
+ }
+ redundant = addr1;
+
+ /*
+ * have to set environment.image for flash_read(), careful -
+ * other pointers in environment still point inside addr0
+ */
+ environment.image = addr1;
+ if (flash_io(O_RDONLY)) {
+ ret = -EIO;
+ goto open_cleanup;
+ }
+
+ /* Check flag scheme compatibility */
+ if (DEVTYPE(dev_current) == MTD_NORFLASH &&
+ DEVTYPE(!dev_current) == MTD_NORFLASH) {
+ environment.flag_scheme = FLAG_BOOLEAN;
+ } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
+ DEVTYPE(!dev_current) == MTD_NANDFLASH) {
+ environment.flag_scheme = FLAG_INCREMENTAL;
+ } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
+ DEVTYPE(!dev_current) == MTD_DATAFLASH) {
+ environment.flag_scheme = FLAG_BOOLEAN;
+ } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
+ DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
+ environment.flag_scheme = FLAG_INCREMENTAL;
+ } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
+ DEVTYPE(!dev_current) == MTD_ABSENT &&
+ IS_UBI(dev_current) == IS_UBI(!dev_current)) {
+ environment.flag_scheme = FLAG_INCREMENTAL;
+ } else {
+ fprintf(stderr, "Incompatible flash types!\n");
+ ret = -EINVAL;
+ goto open_cleanup;
+ }
+
+ crc1 = crc32(0, (uint8_t *)redundant->data, ENV_SIZE);
+
+ crc1_ok = (crc1 == redundant->crc);
+ flag1 = redundant->flags;
+
+ /*
+ * environment.data still points to ((struct
+ * env_image_redundant *)addr0)->data. If the two
+ * environments differ, or one has bad crc, force a
+ * write-out by marking the environment dirty.
+ */
+ if (memcmp(environment.data, redundant->data, ENV_SIZE) ||
+ !crc0_ok || !crc1_ok)
+ environment.dirty = 1;
+
+ if (crc0_ok && !crc1_ok) {
+ dev_current = 0;
+ } else if (!crc0_ok && crc1_ok) {
+ dev_current = 1;
+ } else if (!crc0_ok && !crc1_ok) {
+ fprintf(stderr,
+ "Warning: Bad CRC, using default environment\n");
+ memcpy(environment.data, default_environment,
+ sizeof(default_environment));
+ environment.dirty = 1;
+ dev_current = 0;
+ } else {
+ switch (environment.flag_scheme) {
+ case FLAG_BOOLEAN:
+ if (flag0 == ENV_REDUND_ACTIVE &&
+ flag1 == ENV_REDUND_OBSOLETE) {
+ dev_current = 0;
+ } else if (flag0 == ENV_REDUND_OBSOLETE &&
+ flag1 == ENV_REDUND_ACTIVE) {
+ dev_current = 1;
+ } else if (flag0 == flag1) {
+ dev_current = 0;
+ } else if (flag0 == 0xFF) {
+ dev_current = 0;
+ } else if (flag1 == 0xFF) {
+ dev_current = 1;
+ } else {
+ dev_current = 0;
+ }
+ break;
+ case FLAG_INCREMENTAL:
+ if (flag0 == 255 && flag1 == 0)
+ dev_current = 1;
+ else if ((flag1 == 255 && flag0 == 0) ||
+ flag0 >= flag1)
+ dev_current = 0;
+ else /* flag1 > flag0 */
+ dev_current = 1;
+ break;
+ default:
+ fprintf(stderr, "Unknown flag scheme %u\n",
+ environment.flag_scheme);
+ return -1;
+ }
+ }
+
+ /*
+ * If we are reading, we don't need the flag and the CRC any
+ * more, if we are writing, we will re-calculate CRC and update
+ * flags before writing out
+ */
+ if (dev_current) {
+ environment.image = addr1;
+ environment.crc = &redundant->crc;
+ environment.flags = &redundant->flags;
+ environment.data = redundant->data;
+ free(addr0);
+ } else {
+ environment.image = addr0;
+ /* Other pointers are already set */
+ free(addr1);
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
+#endif
+ }
+ return 0;
+
+ open_cleanup:
+ if (addr0)
+ free(addr0);
+
+ if (addr1)
+ free(addr1);
+
+ return ret;
+}
+
+/*
+ * Simply free allocated buffer with environment
+ */
+int fw_env_close(struct env_opts *opts)
+{
+ if (environment.image)
+ free(environment.image);
+
+ environment.image = NULL;
+
+ return 0;
+}
+
+static int check_device_config(int dev)
+{
+ struct stat st;
+ int32_t lnum = 0;
+ int fd, rc = 0;
+
+ /* Fills in IS_UBI(), converts DEVNAME() with ubi volume name */
+ ubi_check_dev(dev);
+
+ fd = open(DEVNAME(dev), O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr,
+ "Cannot open %s: %s\n", DEVNAME(dev), strerror(errno));
+ return -1;
+ }
+
+ rc = fstat(fd, &st);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot stat the file %s\n", DEVNAME(dev));
+ goto err;
+ }
+
+ if (IS_UBI(dev)) {
+ rc = ioctl(fd, UBI_IOCEBISMAP, &lnum);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot get UBI information for %s\n",
+ DEVNAME(dev));
+ goto err;
+ }
+ } else if (S_ISCHR(st.st_mode)) {
+ struct mtd_info_user mtdinfo;
+ rc = ioctl(fd, MEMGETINFO, &mtdinfo);
+ if (rc < 0) {
+ fprintf(stderr, "Cannot get MTD information for %s\n",
+ DEVNAME(dev));
+ goto err;
+ }
+ if (mtdinfo.type != MTD_NORFLASH &&
+ mtdinfo.type != MTD_NANDFLASH &&
+ mtdinfo.type != MTD_DATAFLASH &&
+ mtdinfo.type != MTD_UBIVOLUME) {
+ fprintf(stderr, "Unsupported flash type %u on %s\n",
+ mtdinfo.type, DEVNAME(dev));
+ goto err;
+ }
+ DEVTYPE(dev) = mtdinfo.type;
+ if (DEVESIZE(dev) == 0 && ENVSECTORS(dev) == 0 &&
+ mtdinfo.type == MTD_NORFLASH)
+ DEVESIZE(dev) = mtdinfo.erasesize;
+ if (DEVESIZE(dev) == 0)
+ /* Assume the erase size is the same as the env-size */
+ DEVESIZE(dev) = ENVSIZE(dev);
+ } else {
+ uint64_t size;
+ DEVTYPE(dev) = MTD_ABSENT;
+ if (DEVESIZE(dev) == 0)
+ /* Assume the erase size to be 512 bytes */
+ DEVESIZE(dev) = 0x200;
+
+ /*
+ * Check for negative offsets, treat it as backwards offset
+ * from the end of the block device
+ */
+ if (DEVOFFSET(dev) < 0) {
+ rc = ioctl(fd, BLKGETSIZE64, &size);
+ if (rc < 0) {
+ fprintf(stderr,
+ "Could not get block device size on %s\n",
+ DEVNAME(dev));
+ goto err;
+ }
+
+ DEVOFFSET(dev) = DEVOFFSET(dev) + size;
+#ifdef DEBUG
+ fprintf(stderr,
+ "Calculated device offset 0x%llx on %s\n",
+ DEVOFFSET(dev), DEVNAME(dev));
+#endif
+ }
+ }
+
+ if (ENVSECTORS(dev) == 0)
+ /* Assume enough sectors to cover the environment */
+ ENVSECTORS(dev) = DIV_ROUND_UP(ENVSIZE(dev), DEVESIZE(dev));
+
+ if (DEVOFFSET(dev) % DEVESIZE(dev) != 0) {
+ fprintf(stderr,
+ "Environment does not start on (erase) block boundary\n");
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (ENVSIZE(dev) > ENVSECTORS(dev) * DEVESIZE(dev)) {
+ fprintf(stderr,
+ "Environment does not fit into available sectors\n");
+ errno = EINVAL;
+ return -1;
+ }
+
+ err:
+ close(fd);
+ return rc;
+}
+
+static int parse_config(struct env_opts *opts)
+{
+ int rc;
+
+ if (!opts)
+ opts = &default_opts;
+
+#if defined(CONFIG_FILE)
+ /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
+ if (get_config(opts->config_file)) {
+ fprintf(stderr, "Cannot parse config file '%s': %m\n",
+ opts->config_file);
+ return -1;
+ }
+#else
+ DEVNAME(0) = DEVICE1_NAME;
+ DEVOFFSET(0) = DEVICE1_OFFSET;
+ ENVSIZE(0) = ENV1_SIZE;
+
+ /* Set defaults for DEVESIZE, ENVSECTORS later once we
+ * know DEVTYPE
+ */
+#ifdef DEVICE1_ESIZE
+ DEVESIZE(0) = DEVICE1_ESIZE;
+#endif
+#ifdef DEVICE1_ENVSECTORS
+ ENVSECTORS(0) = DEVICE1_ENVSECTORS;
+#endif
+
+#ifdef HAVE_REDUND
+ DEVNAME(1) = DEVICE2_NAME;
+ DEVOFFSET(1) = DEVICE2_OFFSET;
+ ENVSIZE(1) = ENV2_SIZE;
+
+ /* Set defaults for DEVESIZE, ENVSECTORS later once we
+ * know DEVTYPE
+ */
+#ifdef DEVICE2_ESIZE
+ DEVESIZE(1) = DEVICE2_ESIZE;
+#endif
+#ifdef DEVICE2_ENVSECTORS
+ ENVSECTORS(1) = DEVICE2_ENVSECTORS;
+#endif
+ have_redund_env = 1;
+#endif
+#endif
+ rc = check_device_config(0);
+ if (rc < 0)
+ return rc;
+
+ if (have_redund_env) {
+ rc = check_device_config(1);
+ if (rc < 0)
+ return rc;
+
+ if (ENVSIZE(0) != ENVSIZE(1)) {
+ fprintf(stderr,
+ "Redundant environments have unequal size\n");
+ return -1;
+ }
+ }
+
+ usable_envsize = CUR_ENVSIZE - sizeof(uint32_t);
+ if (have_redund_env)
+ usable_envsize -= sizeof(char);
+
+ return 0;
+}
+
+#if defined(CONFIG_FILE)
+static int get_config(char *fname)
+{
+ FILE *fp;
+ int i = 0;
+ int rc;
+ char *line = NULL;
+ size_t linesize = 0;
+ char *devname;
+
+ fp = fopen(fname, "r");
+ if (fp == NULL)
+ return -1;
+
+ while (i < 2 && getline(&line, &linesize, fp) != -1) {
+ /* Skip comment strings */
+ if (line[0] == '#')
+ continue;
+
+ rc = sscanf(line, "%ms %lli %lx %lx %lx",
+ &devname,
+ &DEVOFFSET(i),
+ &ENVSIZE(i), &DEVESIZE(i), &ENVSECTORS(i));
+
+ if (rc < 3)
+ continue;
+
+ DEVNAME(i) = devname;
+
+ /* Set defaults for DEVESIZE, ENVSECTORS later once we
+ * know DEVTYPE
+ */
+
+ i++;
+ }
+ free(line);
+ fclose(fp);
+
+ have_redund_env = i - 1;
+ if (!i) { /* No valid entries found */
+ errno = EINVAL;
+ return -1;
+ } else
+ return 0;
+}
+#endif