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u-boot/tools/env/fw_env.c
Simon Glass 7b27e0fe13 tools: env: Avoid an uninited warning with was_locked 
Set this variable to 0 to avoid a warning about an unused variable. This
happens on gcc 7.5.0 for me.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-08-05 08:18:34 -04:00

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// 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 0;
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
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