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// SPDX-License-Identifier: GPL-2.0-or-later
#include "common.h"
#define BUFLEN 128
int
read_uint_from_file(char *dirname, char *filename, unsigned int *i)
{
FILE *f;
char fname[BUFLEN];
int ret = -1;
snprintf(fname, sizeof(fname), "%s/%s", dirname, filename);
f = fopen(fname, "r");
if (!f)
return ret;
if (fscanf(f, "%u", i) == 1)
ret = 0;
fclose(f);
return ret;
}
char
*read_string_from_file(const char *dirname, const char *filename, char *buf, size_t bufsz)
{
FILE *f;
char fname[BUFLEN];
int i;
snprintf(fname, sizeof(fname), "%s/%s", dirname, filename);
f = fopen(fname, "r");
if (!f)
return NULL;
if (fgets(buf, bufsz, f) == NULL) {
fclose(f);
return NULL;
}
fclose(f);
/* make sure the string is \0 terminated */
buf[bufsz - 1] = '\0';
/* remove trailing whitespace */
i = strlen(buf) - 1;
while (i > 0 && buf[i] <= ' ')
buf[i--] = '\0';
return buf;
}
int block_file_identify(FILE *f, uint64_t offset)
{
uint32_t magic = 0;
size_t n;
if (fseeko(f, offset, SEEK_SET) < 0)
return -1;
n = fread(&magic, sizeof(magic), 1, f);
if (magic == cpu_to_le32(0x88b1f))
return FS_TARGZ;
if (magic == cpu_to_be32(0xdeadc0de))
return FS_DEADCODE;
if (fseeko(f, offset + 0x400, SEEK_SET) < 0)
return -1;
n = fread(&magic, sizeof(magic), 1, f);
if (n != 1)
return -1;
if (magic == cpu_to_le32(0xF2F52010))
return FS_F2FS;
magic = 0;
if (fseeko(f, offset + 0x438, SEEK_SET) < 0)
return -1;
n = fread(&magic, sizeof(magic), 1, f);
if (n != 1)
return -1;
if ((le32_to_cpu(magic) & 0xffff) == 0xef53)
return FS_EXT4;
return FS_NONE;
}
static bool use_f2fs(struct volume *v, uint64_t offset, const char *bdev)
{
uint64_t size = 0;
bool ret = false;
int fd;
fd = open(bdev, O_RDONLY);
if (fd < 0)
return false;
if (ioctl(fd, BLKGETSIZE64, &size) == 0)
ret = size - offset > F2FS_MINSIZE;
close(fd);
return ret;
}
int block_volume_format(struct volume *v, uint64_t offset, const char *bdev)
{
int ret = 0;
char str[128];
unsigned int skip_blocks = 0;
int fd;
__u32 deadc0de;
size_t sz;
switch (volume_identify(v)) {
case FS_DEADCODE:
/* skip padding */
fd = open(v->blk, O_RDONLY);
if (fd < 0) {
ret = EIO;
break;
}
do {
if (lseek(fd, (skip_blocks + 1) * 512, SEEK_SET) == (off_t) -1) {
ret = EIO;
break;
}
sz = read(fd, &deadc0de, sizeof(deadc0de));
if (sz != sizeof(deadc0de)) {
ret = EIO;
break;
}
} while(++skip_blocks <= 512 &&
(deadc0de == cpu_to_be32(0xdeadc0de) || deadc0de == 0xffffffff));
close(fd);
if (ret)
break;
/* only try extracting in case gzip header is present */
if (deadc0de != cpu_to_le32(0x88b1f))
goto do_format;
/* fall-through */
case FS_TARGZ:
snprintf(str, sizeof(str),
"dd if=%s bs=512 skip=%u 2>/dev/null | gzip -cd > /tmp/sysupgrade.tar 2>/dev/null",
v->blk, skip_blocks);
ret = system(str);
if (ret < 0) {
ULOG_ERR("failed extracting config backup from %s\n", v->blk);
break;
}
/* fall-through */
case FS_NONE:
do_format:
ULOG_INFO("overlay filesystem in %s has not been formatted yet\n", v->blk);
if (use_f2fs(v, offset, bdev))
snprintf(str, sizeof(str), "mkfs.f2fs -q -l rootfs_data %s", v->blk);
else
snprintf(str, sizeof(str), "mkfs.ext4 -q -L rootfs_data %s", v->blk);
ret = system(str);
break;
default:
break;
}
return ret;
}
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