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#![cfg_attr(feature = "nightly", feature(async_fn_in_trait))]
#![allow(incomplete_features)]
#![no_std]
#![warn(missing_docs)]
#![doc = include_str!("../README.md")]
mod fmt;
mod boot_loader;
mod digest_adapters;
mod firmware_updater;
mod mem_flash;
mod partition;
pub use boot_loader::{BootError, BootFlash, BootLoader, FlashConfig, MultiFlashConfig, SingleFlashConfig};
pub use firmware_updater::{FirmwareUpdater, FirmwareUpdaterError};
pub use partition::Partition;
pub(crate) const BOOT_MAGIC: u8 = 0xD0;
pub(crate) const SWAP_MAGIC: u8 = 0xF0;
/// The state of the bootloader after running prepare.
#[derive(PartialEq, Eq, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum State {
/// Bootloader is ready to boot the active partition.
Boot,
/// Bootloader has swapped the active partition with the dfu partition and will attempt boot.
Swap,
}
/// Buffer aligned to 32 byte boundary, largest known alignment requirement for embassy-boot.
#[repr(align(32))]
pub struct AlignedBuffer<const N: usize>(pub [u8; N]);
impl<const N: usize> AsRef<[u8]> for AlignedBuffer<N> {
fn as_ref(&self) -> &[u8] {
&self.0
}
}
impl<const N: usize> AsMut<[u8]> for AlignedBuffer<N> {
fn as_mut(&mut self) -> &mut [u8] {
&mut self.0
}
}
#[cfg(test)]
mod tests {
use futures::executor::block_on;
use super::*;
use crate::mem_flash::MemFlash;
/*
#[test]
fn test_bad_magic() {
let mut flash = MemFlash([0xff; 131072]);
let mut flash = SingleFlashConfig::new(&mut flash);
let mut bootloader = BootLoader::<4096>::new(ACTIVE, DFU, STATE);
assert_eq!(
bootloader.prepare_boot(&mut flash),
Err(BootError::BadMagic)
);
}
*/
#[test]
fn test_boot_state() {
const STATE: Partition = Partition::new(0, 4096);
const ACTIVE: Partition = Partition::new(4096, 61440);
const DFU: Partition = Partition::new(61440, 122880);
let mut flash = MemFlash::<131072, 4096, 4>::default();
flash.mem[0..4].copy_from_slice(&[BOOT_MAGIC; 4]);
let mut flash = SingleFlashConfig::new(&mut flash);
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
let mut page = [0; 4096];
assert_eq!(State::Boot, bootloader.prepare_boot(&mut flash, &mut page).unwrap());
}
#[test]
#[cfg(all(feature = "nightly", not(feature = "_verify")))]
fn test_swap_state() {
const STATE: Partition = Partition::new(0, 4096);
const ACTIVE: Partition = Partition::new(4096, 61440);
const DFU: Partition = Partition::new(61440, 122880);
let mut flash = MemFlash::<131072, 4096, 4>::random();
let original = [rand::random::<u8>(); ACTIVE.size() as usize];
let update = [rand::random::<u8>(); ACTIVE.size() as usize];
let mut aligned = [0; 4];
flash.program(ACTIVE.from, &original).unwrap();
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
let mut updater = FirmwareUpdater::new(DFU, STATE);
block_on(updater.write_firmware(0, &update, &mut flash)).unwrap();
block_on(updater.mark_updated(&mut flash, &mut aligned)).unwrap();
let mut page = [0; 1024];
assert_eq!(
State::Swap,
bootloader
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut page)
.unwrap()
);
flash.assert_eq(ACTIVE.from, &update);
// First DFU page is untouched
flash.assert_eq(DFU.from + 4096, &original);
// Running again should cause a revert
assert_eq!(
State::Swap,
bootloader
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut page)
.unwrap()
);
flash.assert_eq(ACTIVE.from, &original);
// Last page is untouched
flash.assert_eq(DFU.from, &update);
// Mark as booted
block_on(updater.mark_booted(&mut flash, &mut aligned)).unwrap();
assert_eq!(
State::Boot,
bootloader
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut page)
.unwrap()
);
}
#[test]
#[cfg(all(feature = "nightly", not(feature = "_verify")))]
fn test_separate_flash_active_page_biggest() {
const STATE: Partition = Partition::new(2048, 4096);
const ACTIVE: Partition = Partition::new(4096, 16384);
const DFU: Partition = Partition::new(0, 16384);
let mut active = MemFlash::<16384, 4096, 8>::random();
let mut dfu = MemFlash::<16384, 2048, 8>::random();
let mut state = MemFlash::<4096, 128, 4>::random();
let mut aligned = [0; 4];
let original = [rand::random::<u8>(); ACTIVE.size() as usize];
let update = [rand::random::<u8>(); ACTIVE.size() as usize];
active.program(ACTIVE.from, &original).unwrap();
let mut updater = FirmwareUpdater::new(DFU, STATE);
block_on(updater.write_firmware(0, &update, &mut dfu)).unwrap();
block_on(updater.mark_updated(&mut state, &mut aligned)).unwrap();
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
let mut page = [0; 4096];
assert_eq!(
State::Swap,
bootloader
.prepare_boot(&mut MultiFlashConfig::new(&mut active, &mut state, &mut dfu), &mut page)
.unwrap()
);
active.assert_eq(ACTIVE.from, &update);
// First DFU page is untouched
dfu.assert_eq(DFU.from + 4096, &original);
}
#[test]
#[cfg(all(feature = "nightly", not(feature = "_verify")))]
fn test_separate_flash_dfu_page_biggest() {
const STATE: Partition = Partition::new(2048, 4096);
const ACTIVE: Partition = Partition::new(4096, 16384);
const DFU: Partition = Partition::new(0, 16384);
let mut aligned = [0; 4];
let mut active = MemFlash::<16384, 2048, 4>::random();
let mut dfu = MemFlash::<16384, 4096, 8>::random();
let mut state = MemFlash::<4096, 128, 4>::random();
let original = [rand::random::<u8>(); ACTIVE.size() as usize];
let update = [rand::random::<u8>(); ACTIVE.size() as usize];
active.program(ACTIVE.from, &original).unwrap();
let mut updater = FirmwareUpdater::new(DFU, STATE);
block_on(updater.write_firmware(0, &update, &mut dfu)).unwrap();
block_on(updater.mark_updated(&mut state, &mut aligned)).unwrap();
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
let mut page = [0; 4096];
assert_eq!(
State::Swap,
bootloader
.prepare_boot(
&mut MultiFlashConfig::new(&mut active, &mut state, &mut dfu,),
&mut page
)
.unwrap()
);
active.assert_eq(ACTIVE.from, &update);
// First DFU page is untouched
dfu.assert_eq(DFU.from + 4096, &original);
}
#[test]
#[cfg(all(feature = "nightly", feature = "_verify"))]
fn test_verify() {
// The following key setup is based on:
// https://docs.rs/ed25519-dalek/latest/ed25519_dalek/#example
use ed25519_dalek::Keypair;
use rand::rngs::OsRng;
let mut csprng = OsRng {};
let keypair: Keypair = Keypair::generate(&mut csprng);
use ed25519_dalek::{Digest, Sha512, Signature, Signer};
let firmware: &[u8] = b"This are bytes that would otherwise be firmware bytes for DFU.";
let mut digest = Sha512::new();
digest.update(&firmware);
let message = digest.finalize();
let signature: Signature = keypair.sign(&message);
use ed25519_dalek::PublicKey;
let public_key: PublicKey = keypair.public;
// Setup flash
const STATE: Partition = Partition::new(0, 4096);
const DFU: Partition = Partition::new(4096, 8192);
let mut flash = MemFlash::<8192, 4096, 4>::default();
let firmware_len = firmware.len();
let mut write_buf = [0; 4096];
write_buf[0..firmware_len].copy_from_slice(firmware);
DFU.write_blocking(&mut flash, 0, &write_buf).unwrap();
// On with the test
let mut updater = FirmwareUpdater::new(DFU, STATE);
let mut aligned = [0; 4];
assert!(block_on(updater.verify_and_mark_updated(
&mut flash,
&public_key.to_bytes(),
&signature.to_bytes(),
firmware_len as u32,
&mut aligned,
))
.is_ok());
}
}
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