use crate::routing::router::RouteHop;
use crate::util::chacha20::{ChaCha20, ChaChaReader};
use crate::util::errors::{self, APIError};
-use crate::util::ser::{Readable, ReadableArgs, Writeable, LengthCalculatingWriter};
+use crate::util::ser::{Readable, ReadableArgs, Writeable, Writer, LengthCalculatingWriter};
use crate::util::logger::Logger;
use bitcoin::hashes::{Hash, HashEngine};
});
cur_value_msat += hop.fee_msat;
if cur_value_msat >= 21000000 * 100000000 * 1000 {
- return Err(APIError::RouteError{err: "Channel fees overflowed?"});
+ return Err(APIError::InvalidRoute{err: "Channel fees overflowed?".to_owned()});
}
cur_cltv += hop.cltv_expiry_delta as u32;
if cur_cltv >= 500000000 {
- return Err(APIError::RouteError{err: "Channel CLTV overflowed?"});
+ return Err(APIError::InvalidRoute{err: "Channel CLTV overflowed?".to_owned()});
}
last_short_channel_id = hop.short_channel_id;
}
packet
}
-#[inline]
+#[cfg(test)]
pub(super) fn build_first_hop_failure_packet(shared_secret: &[u8], failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
let failure_packet = build_failure_packet(shared_secret, failure_type, failure_data);
encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
} else { unreachable!(); }
}
-/// An input used when decoding an onion packet.
-pub(crate) trait DecodeInput {
- type Arg;
- /// If Some, this is the input when checking the hmac of the onion packet.
- fn payment_hash(&self) -> Option<&PaymentHash>;
- /// Read argument when decrypting our hop payload.
- fn read_arg(self) -> Self::Arg;
+#[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
+pub(super) struct HTLCFailReason(HTLCFailReasonRepr);
+
+#[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
+enum HTLCFailReasonRepr {
+ LightningError {
+ err: msgs::OnionErrorPacket,
+ },
+ Reason {
+ failure_code: u16,
+ data: Vec<u8>,
+ }
}
-impl DecodeInput for PaymentHash {
- type Arg = ();
- fn payment_hash(&self) -> Option<&PaymentHash> {
- Some(self)
+impl core::fmt::Debug for HTLCFailReason {
+ fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
+ match self.0 {
+ HTLCFailReasonRepr::Reason { ref failure_code, .. } => {
+ write!(f, "HTLC error code {}", failure_code)
+ },
+ HTLCFailReasonRepr::LightningError { .. } => {
+ write!(f, "pre-built LightningError")
+ }
+ }
}
- fn read_arg(self) -> Self::Arg { () }
}
-impl DecodeInput for SharedSecret {
- type Arg = SharedSecret;
- fn payment_hash(&self) -> Option<&PaymentHash> {
- None
+impl Writeable for HTLCFailReason {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), crate::io::Error> {
+ self.0.write(writer)
+ }
+}
+impl Readable for HTLCFailReason {
+ fn read<R: Read>(reader: &mut R) -> Result<Self, msgs::DecodeError> {
+ Ok(Self(Readable::read(reader)?))
+ }
+}
+
+impl_writeable_tlv_based_enum!(HTLCFailReasonRepr,
+ (0, LightningError) => {
+ (0, err, required),
+ },
+ (1, Reason) => {
+ (0, failure_code, required),
+ (2, data, vec_type),
+ },
+;);
+
+impl HTLCFailReason {
+ pub(super) fn reason(failure_code: u16, data: Vec<u8>) -> Self {
+ const BADONION: u16 = 0x8000;
+ const PERM: u16 = 0x4000;
+ const NODE: u16 = 0x2000;
+ const UPDATE: u16 = 0x1000;
+
+ if failure_code == 1 | PERM { debug_assert!(data.is_empty()) }
+ else if failure_code == 2 | NODE { debug_assert!(data.is_empty()) }
+ else if failure_code == 2 | PERM | NODE { debug_assert!(data.is_empty()) }
+ else if failure_code == 3 | PERM | NODE { debug_assert!(data.is_empty()) }
+ else if failure_code == 4 | BADONION | PERM { debug_assert_eq!(data.len(), 32) }
+ else if failure_code == 5 | BADONION | PERM { debug_assert_eq!(data.len(), 32) }
+ else if failure_code == 6 | BADONION | PERM { debug_assert_eq!(data.len(), 32) }
+ else if failure_code == 7 | UPDATE {
+ debug_assert_eq!(data.len() - 2, u16::from_be_bytes(data[0..2].try_into().unwrap()) as usize) }
+ else if failure_code == 8 | PERM { debug_assert!(data.is_empty()) }
+ else if failure_code == 9 | PERM { debug_assert!(data.is_empty()) }
+ else if failure_code == 10 | PERM { debug_assert!(data.is_empty()) }
+ else if failure_code == 11 | UPDATE {
+ debug_assert_eq!(data.len() - 2 - 8, u16::from_be_bytes(data[8..10].try_into().unwrap()) as usize) }
+ else if failure_code == 12 | UPDATE {
+ debug_assert_eq!(data.len() - 2 - 8, u16::from_be_bytes(data[8..10].try_into().unwrap()) as usize) }
+ else if failure_code == 13 | UPDATE {
+ debug_assert_eq!(data.len() - 2 - 4, u16::from_be_bytes(data[4..6].try_into().unwrap()) as usize) }
+ else if failure_code == 14 | UPDATE {
+ debug_assert_eq!(data.len() - 2, u16::from_be_bytes(data[0..2].try_into().unwrap()) as usize) }
+ else if failure_code == 15 | PERM { debug_assert_eq!(data.len(), 12) }
+ else if failure_code == 18 { debug_assert_eq!(data.len(), 4) }
+ else if failure_code == 19 { debug_assert_eq!(data.len(), 8) }
+ else if failure_code == 20 | UPDATE {
+ debug_assert_eq!(data.len() - 2 - 2, u16::from_be_bytes(data[2..4].try_into().unwrap()) as usize) }
+ else if failure_code == 21 { debug_assert!(data.is_empty()) }
+ else if failure_code == 22 | PERM { debug_assert!(data.len() <= 11) }
+ else if failure_code == 23 { debug_assert!(data.is_empty()) }
+ else if failure_code & BADONION != 0 {
+ // We set some bogus BADONION failure codes in test, so ignore unknown ones.
+ }
+ else { debug_assert!(false, "Unknown failure code: {}", failure_code) }
+
+ Self(HTLCFailReasonRepr::Reason { failure_code, data })
+ }
+
+ pub(super) fn from_failure_code(failure_code: u16) -> Self {
+ Self::reason(failure_code, Vec::new())
+ }
+
+ pub(super) fn from_msg(msg: &msgs::UpdateFailHTLC) -> Self {
+ Self(HTLCFailReasonRepr::LightningError { err: msg.reason.clone() })
+ }
+
+ pub(super) fn get_encrypted_failure_packet(&self, incoming_packet_shared_secret: &[u8; 32], phantom_shared_secret: &Option<[u8; 32]>)
+ -> msgs::OnionErrorPacket {
+ match self.0 {
+ HTLCFailReasonRepr::Reason { ref failure_code, ref data } => {
+ if let Some(phantom_ss) = phantom_shared_secret {
+ let phantom_packet = build_failure_packet(phantom_ss, *failure_code, &data[..]).encode();
+ let encrypted_phantom_packet = encrypt_failure_packet(phantom_ss, &phantom_packet);
+ encrypt_failure_packet(incoming_packet_shared_secret, &encrypted_phantom_packet.data[..])
+ } else {
+ let packet = build_failure_packet(incoming_packet_shared_secret, *failure_code, &data[..]).encode();
+ encrypt_failure_packet(incoming_packet_shared_secret, &packet)
+ }
+ },
+ HTLCFailReasonRepr::LightningError { ref err } => {
+ encrypt_failure_packet(incoming_packet_shared_secret, &err.data)
+ }
+ }
+ }
+
+ pub(super) fn decode_onion_failure<T: secp256k1::Signing, L: Deref>(
+ &self, secp_ctx: &Secp256k1<T>, logger: &L, htlc_source: &HTLCSource
+ ) -> (Option<NetworkUpdate>, Option<u64>, bool, Option<u16>, Option<Vec<u8>>)
+ where L::Target: Logger {
+ match self.0 {
+ HTLCFailReasonRepr::LightningError { ref err } => {
+ process_onion_failure(secp_ctx, logger, &htlc_source, err.data.clone())
+ },
+ HTLCFailReasonRepr::Reason { ref failure_code, ref data, .. } => {
+ // we get a fail_malformed_htlc from the first hop
+ // TODO: We'd like to generate a NetworkUpdate for temporary
+ // failures here, but that would be insufficient as find_route
+ // generally ignores its view of our own channels as we provide them via
+ // ChannelDetails.
+ if let &HTLCSource::OutboundRoute { ref path, .. } = htlc_source {
+ (None, Some(path.first().unwrap().short_channel_id), true, Some(*failure_code), Some(data.clone()))
+ } else { unreachable!(); }
+ }
+ }
}
- fn read_arg(self) -> Self::Arg { self }
}
/// Allows `decode_next_hop` to return the next hop packet bytes for either payments or onion
}
pub(crate) fn decode_next_payment_hop(shared_secret: [u8; 32], hop_data: &[u8], hmac_bytes: [u8; 32], payment_hash: PaymentHash) -> Result<Hop, OnionDecodeErr> {
- match decode_next_hop(shared_secret, hop_data, hmac_bytes, payment_hash) {
+ match decode_next_hop(shared_secret, hop_data, hmac_bytes, Some(payment_hash), ()) {
Ok((next_hop_data, None)) => Ok(Hop::Receive(next_hop_data)),
Ok((next_hop_data, Some((next_hop_hmac, FixedSizeOnionPacket(new_packet_bytes))))) => {
Ok(Hop::Forward {
}
}
-pub(crate) fn decode_next_hop<D: DecodeInput, R: ReadableArgs<D::Arg>, N: NextPacketBytes>(shared_secret: [u8; 32], hop_data: &[u8], hmac_bytes: [u8; 32], decode_input: D) -> Result<(R, Option<([u8; 32], N)>), OnionDecodeErr> {
+pub(crate) fn decode_next_untagged_hop<T, R: ReadableArgs<T>, N: NextPacketBytes>(shared_secret: [u8; 32], hop_data: &[u8], hmac_bytes: [u8; 32], read_args: T) -> Result<(R, Option<([u8; 32], N)>), OnionDecodeErr> {
+ decode_next_hop(shared_secret, hop_data, hmac_bytes, None, read_args)
+}
+
+fn decode_next_hop<T, R: ReadableArgs<T>, N: NextPacketBytes>(shared_secret: [u8; 32], hop_data: &[u8], hmac_bytes: [u8; 32], payment_hash: Option<PaymentHash>, read_args: T) -> Result<(R, Option<([u8; 32], N)>), OnionDecodeErr> {
let (rho, mu) = gen_rho_mu_from_shared_secret(&shared_secret);
let mut hmac = HmacEngine::<Sha256>::new(&mu);
hmac.input(hop_data);
- if let Some(payment_hash) = decode_input.payment_hash() {
- hmac.input(&payment_hash.0[..]);
+ if let Some(tag) = payment_hash {
+ hmac.input(&tag.0[..]);
}
if !fixed_time_eq(&Hmac::from_engine(hmac).into_inner(), &hmac_bytes) {
return Err(OnionDecodeErr::Malformed {
let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
let mut chacha_stream = ChaChaReader { chacha: &mut chacha, read: Cursor::new(&hop_data[..]) };
- match R::read(&mut chacha_stream, decode_input.read_arg()) {
+ match R::read(&mut chacha_stream, read_args) {
Err(err) => {
let error_code = match err {
msgs::DecodeError::UnknownVersion => 0x4000 | 1, // unknown realm byte
projects / rust-lightning / blobdiff