/*
* Read version from image header from flash area 'area_id'.
* Returns -1 if area is not readable.
* Returns 0 if image in slot is ok, and version string is valid.
* Returns 1 if there is not a full image.
* Returns 2 if slot is empty.
*/
int
imgr_read_ver(int area_id, struct image_version *ver)
{
struct image_header hdr;
int rc;
const struct flash_area *fa;
rc = flash_area_open(area_id, &fa);
if (rc) {
return -1;
}
rc = flash_area_read(fa, 0, &hdr, sizeof(hdr));
if (rc) {
return -1;
}
memset(ver, 0xff, sizeof(*ver));
if (hdr.ih_magic == 0x96f3b83c) {
memcpy(ver, &hdr.ih_ver, sizeof(*ver));
rc = 0;
} else {
rc = 1;
}
flash_area_close(fa);
return rc;
}
/*
* Read the image trailer from a given slot.
*/
static int
boot_vect_read_img_trailer(int slot, struct boot_img_trailer *bit)
{
int rc;
const struct flash_area *fap;
uint32_t off;
rc = flash_area_open(slot, &fap);
if (rc) {
return rc;
}
off = fap->fa_size - sizeof(struct boot_img_trailer);
rc = flash_area_read(fap, off, bit, sizeof(*bit));
flash_area_close(fap);
return rc;
}
/**
* Write the test image version number from the boot vector.
*
* @return 0 on success; nonzero on failure.
*/
int
boot_vect_write_test(int slot)
{
const struct flash_area *fap;
uint32_t off;
uint32_t magic;
int rc;
rc = flash_area_open(slot, &fap);
if (rc) {
return rc;
}
off = fap->fa_size - sizeof(struct boot_img_trailer);
magic = BOOT_IMG_MAGIC;
rc = flash_area_write(fap, off, &magic, sizeof(magic));
flash_area_close(fap);
return rc;
}
/*
* Read version and build hash from image located slot "image_slot". Note:
* this is a slot index, not a flash area ID.
*
* @param image_slot
* @param ver (optional)
* @param hash (optional)
* @param flags
*
* Returns -1 if area is not readable.
* Returns 0 if image in slot is ok, and version string is valid.
* Returns 1 if there is not a full image.
* Returns 2 if slot is empty. XXXX not there yet
*/
int
imgr_read_info(int image_slot, struct image_version *ver, uint8_t *hash,
uint32_t *flags)
{
struct image_header *hdr;
struct image_tlv *tlv;
int rc = -1;
int rc2;
const struct flash_area *fa;
uint8_t data[sizeof(struct image_header)];
uint32_t data_off, data_end;
int area_id;
area_id = flash_area_id_from_image_slot(image_slot);
hdr = (struct image_header *)data;
rc2 = flash_area_open(area_id, &fa);
if (rc2) {
return -1;
}
rc2 = flash_area_read(fa, 0, hdr, sizeof(*hdr));
if (rc2) {
goto end;
}
if (ver != NULL) {
memset(ver, 0xff, sizeof(*ver));
if (hdr->ih_magic == IMAGE_MAGIC) {
memcpy(ver, &hdr->ih_ver, sizeof(*ver));
} else if (hdr->ih_magic == 0xffffffff) {
rc = 2;
goto end;
} else {
rc = 1;
goto end;
}
}
if(flags) {
*flags = hdr->ih_flags;
}
/*
* Build ID is in a TLV after the image.
*/
data_off = hdr->ih_hdr_size + hdr->ih_img_size;
data_end = data_off + hdr->ih_tlv_size;
if (data_end > fa->fa_size) {
rc = 1;
goto end;
}
tlv = (struct image_tlv *)data;
while (data_off + sizeof(*tlv) <= data_end) {
rc2 = flash_area_read(fa, data_off, tlv, sizeof(*tlv));
if (rc2) {
goto end;
}
if (tlv->it_type == 0xff && tlv->it_len == 0xffff) {
break;
}
if (tlv->it_type != IMAGE_TLV_SHA256 ||
tlv->it_len != IMGMGR_HASH_LEN) {
data_off += sizeof(*tlv) + tlv->it_len;
continue;
}
data_off += sizeof(*tlv);
if (hash) {
if (data_off + IMGMGR_HASH_LEN > data_end) {
goto end;
}
rc2 = flash_area_read(fa, data_off, hash, IMGMGR_HASH_LEN);
if (rc2) {
goto end;
}
}
rc = 0;
goto end;
}
rc = 1;
end:
flash_area_close(fa);
return rc;
}