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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 Albert Schwarzkopf <a.schwarzkopf@phytec.de>, PHYTEC Messtechnik GmbH
* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*/
/**
* @file
* @brief Environment handling support (host and target)
*
* Important: This file will also be used on the host to create
* the default environment when building the barebox binary. So
* do not add any new barebox related functions here!
*/
#define pr_fmt(fmt) "envfs: " fmt
#ifdef __BAREBOX__
#include <common.h>
#include <fs.h>
#include <crc.h>
#include <envfs.h>
#include <libbb.h>
#include <libgen.h>
#include <environment.h>
#include <libfile.h>
#else
#define pr_info(fmt, ...) printf(pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warn(fmt, ...) printf(pr_fmt(fmt), ##__VA_ARGS__)
#endif
static int dir_remove_action(const char *filename, struct stat *statbuf,
void *userdata, int depth)
{
if (!depth)
return 1;
rmdir(filename);
return 1;
}
int envfs_check_super(struct envfs_super *super, size_t *size)
{
if (ENVFS_32(super->magic) != ENVFS_MAGIC) {
pr_info("no envfs (magic mismatch) - envfs never written?\n");
return -EIO;
}
if (crc32(0, super, sizeof(*super) - 4) != ENVFS_32(super->sb_crc)) {
pr_warn("wrong crc on env superblock\n");
return -EIO;
}
if (super->major < ENVFS_MAJOR)
pr_info("version %d.%d loaded into %d.%d\n",
super->major, super->minor,
ENVFS_MAJOR, ENVFS_MINOR);
*size = ENVFS_32(super->size);
return 0;
}
int envfs_check_data(struct envfs_super *super, const void *buf, size_t size)
{
uint32_t crc;
crc = crc32(0, buf, size);
if (crc != ENVFS_32(super->crc)) {
pr_warn("wrong crc on env\n");
return -EIO;
}
return 0;
}
int envfs_load_data(struct envfs_super *super, void *buf, size_t size,
const char *dir, unsigned flags)
{
int fd, ret = 0;
char *str, *tmp;
int headerlen_full;
/* for envfs < 1.0 */
struct envfs_inode_end inode_end_dummy;
struct stat s;
inode_end_dummy.mode = ENVFS_32(S_IRWXU | S_IRWXG | S_IRWXO);
inode_end_dummy.magic = ENVFS_32(ENVFS_INODE_END_MAGIC);
while (size) {
struct envfs_inode *inode;
struct envfs_inode_end *inode_end;
uint32_t inode_size, inode_headerlen, namelen;
inode = buf;
buf += sizeof(struct envfs_inode);
if (ENVFS_32(inode->magic) != ENVFS_INODE_MAGIC) {
pr_warn("wrong magic\n");
ret = -EIO;
goto out;
}
inode_size = ENVFS_32(inode->size);
inode_headerlen = ENVFS_32(inode->headerlen);
namelen = strlen(inode->data) + 1;
if (super->major < 1)
inode_end = &inode_end_dummy;
else
inode_end = buf + PAD4(namelen);
debug("loading %s size %d namelen %d headerlen %d\n", inode->data,
inode_size, namelen, inode_headerlen);
str = concat_path_file(dir, inode->data);
headerlen_full = PAD4(inode_headerlen);
buf += headerlen_full;
if (ENVFS_32(inode_end->magic) != ENVFS_INODE_END_MAGIC) {
printf("envfs: wrong inode_end_magic\n");
ret = -EIO;
goto out;
}
tmp = strdup(str);
make_directory(dirname(tmp));
free(tmp);
ret = stat(str, &s);
if (!ret && (flags & ENV_FLAG_NO_OVERWRITE)) {
printf("skip %s\n", str);
goto skip;
}
if (S_ISLNK(ENVFS_32(inode_end->mode))) {
debug("symlink: %s -> %s\n", str, (char*)buf);
if (!strcmp(buf, basename(str))) {
unlink(str);
} else {
if (!ret)
unlink(str);
ret = symlink(buf, str);
if (ret < 0)
printf("symlink: %s -> %s : %s\n",
str, (char*)buf, strerror(-errno));
}
free(str);
} else {
fd = open(str, O_WRONLY | O_CREAT | O_TRUNC, 0644);
free(str);
if (fd < 0) {
printf("Open %m\n");
ret = fd;
goto out;
}
ret = write(fd, buf, inode_size);
if (ret < inode_size) {
perror("write");
ret = -errno;
close(fd);
goto out;
}
close(fd);
}
skip:
buf += PAD4(inode_size);
size -= headerlen_full + PAD4(inode_size) +
sizeof(struct envfs_inode);
}
recursive_action(dir, ACTION_RECURSE | ACTION_DEPTHFIRST, NULL,
dir_remove_action, NULL, 0);
ret = 0;
out:
return ret;
}
int envfs_load_from_buf(void *buf, int len, const char *dir, unsigned flags)
{
int ret;
size_t size;
struct envfs_super *super = buf;
buf = super + 1;
ret = envfs_check_super(super, &size);
if (ret)
return ret;
ret = envfs_check_data(super, buf, size);
if (ret)
return ret;
ret = envfs_load_data(super, buf, size, dir, flags);
return ret;
}
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