int LUKS_read_phdr_backup(const char *backup_file,
struct luks_phdr *hdr,
int require_luks_device,
struct crypt_device *ctx)
{
ssize_t hdr_size = sizeof(struct luks_phdr);
int devfd = 0, r = 0;
log_dbg("Reading LUKS header of size %d from backup file %s",
(int)hdr_size, backup_file);
devfd = open(backup_file, O_RDONLY);
if(-1 == devfd) {
log_err(ctx, _("Cannot open header backup file %s.\n"), backup_file);
return -ENOENT;
}
if (read(devfd, hdr, hdr_size) < hdr_size)
r = -EIO;
else {
LUKS_fix_header_compatible(hdr);
r = _check_and_convert_hdr(backup_file, hdr,
require_luks_device, 0, ctx);
}
close(devfd);
return r;
}
int LUKS_read_phdr(struct luks_phdr *hdr,
int require_luks_device,
int repair,
struct crypt_device *ctx)
{
struct device *device = crypt_metadata_device(ctx);
ssize_t hdr_size = sizeof(struct luks_phdr);
int devfd = 0, r = 0;
/* LUKS header starts at offset 0, first keyslot on LUKS_ALIGN_KEYSLOTS */
assert(sizeof(struct luks_phdr) <= LUKS_ALIGN_KEYSLOTS);
/* Stripes count cannot be changed without additional code fixes yet */
assert(LUKS_STRIPES == 4000);
if (repair && !require_luks_device)
return -EINVAL;
log_dbg("Reading LUKS header of size %zu from device %s",
hdr_size, device_path(device));
devfd = device_open(device, O_RDONLY);
if (devfd < 0) {
log_err(ctx, _("Cannot open device %s."), device_path(device));
return -EINVAL;
}
if (read_blockwise(devfd, device_block_size(device), device_alignment(device),
hdr, hdr_size) < hdr_size)
r = -EIO;
else
r = _check_and_convert_hdr(device_path(device), hdr, require_luks_device,
repair, ctx);
if (!r)
r = LUKS_check_device_size(ctx, hdr, 0);
/*
* Cryptsetup 1.0.0 did not align keyslots to 4k (very rare version).
* Disable direct-io to avoid possible IO errors if underlying device
* has bigger sector size.
*/
if (!r && hdr->keyblock[0].keyMaterialOffset * SECTOR_SIZE < LUKS_ALIGN_KEYSLOTS) {
log_dbg("Old unaligned LUKS keyslot detected, disabling direct-io.");
device_disable_direct_io(device);
}
close(devfd);
return r;
}
int LUKS_read_phdr(struct luks_phdr *hdr,
int require_luks_device,
int repair,
struct crypt_device *ctx)
{
struct device *device = crypt_metadata_device(ctx);
ssize_t hdr_size = sizeof(struct luks_phdr);
int devfd = 0, r = 0;
/* LUKS header starts at offset 0, first keyslot on LUKS_ALIGN_KEYSLOTS */
assert(sizeof(struct luks_phdr) <= LUKS_ALIGN_KEYSLOTS);
/* Stripes count cannot be changed without additional code fixes yet */
assert(LUKS_STRIPES == 4000);
if (repair && !require_luks_device)
return -EINVAL;
log_dbg("Reading LUKS header of size %zu from device %s",
hdr_size, device_path(device));
devfd = device_open(device, O_RDONLY);
if (devfd == -1) {
log_err(ctx, _("Cannot open device %s.\n"), device_path(device));
return -EINVAL;
}
if (read_blockwise(devfd, device_block_size(device), hdr, hdr_size) < hdr_size)
r = -EIO;
else
r = _check_and_convert_hdr(device_path(device), hdr, require_luks_device,
repair, ctx);
if (!r)
r = LUKS_check_device_size(ctx, hdr->keyBytes);
close(devfd);
return r;
}
