From 8544d6f9ddf9e957c406b33ec4c70b69485c75d7 Mon Sep 17 00:00:00 2001 From: Antoine Riard Date: Fri, 7 Sep 2018 21:42:07 +0000 Subject: [PATCH] Refactor handle_update_fail_htlc to wrapper error handling function --- src/ln/channelmanager.rs | 149 ++++++++++++++++++++------------------- 1 file changed, 77 insertions(+), 72 deletions(-) diff --git a/src/ln/channelmanager.rs b/src/ln/channelmanager.rs index 627a9f5be..60f6eb202 100644 --- a/src/ln/channelmanager.rs +++ b/src/ln/channelmanager.rs @@ -1736,6 +1736,82 @@ impl ChannelManager { } } + fn internal_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result, MsgHandleErrInternal> { + let mut channel_state = self.channel_state.lock().unwrap(); + let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) { + Some(chan) => { + if chan.get_their_node_id() != *their_node_id { + //TODO: here and below MsgHandleErrInternal, #153 case + return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id)); + } + chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() }).map_err(|e| MsgHandleErrInternal::from_maybe_close(e)) + }, + None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id)) + }?; + + if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) { + match pending_htlc { + &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => { + // Handle packed channel/node updates for passing back for the route handler + let mut packet_decrypted = msg.reason.data.clone(); + let mut res = None; + Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| { + if res.is_some() { return; } + + let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret); + + let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len()); + decryption_tmp.resize(packet_decrypted.len(), 0); + let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]); + chacha.process(&packet_decrypted, &mut decryption_tmp[..]); + packet_decrypted = decryption_tmp; + + if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) { + if err_packet.failuremsg.len() >= 2 { + let um = ChannelManager::gen_um_from_shared_secret(&shared_secret); + + let mut hmac = Hmac::new(Sha256::new(), &um); + hmac.input(&err_packet.encode()[32..]); + let mut calc_tag = [0u8; 32]; + hmac.raw_result(&mut calc_tag); + if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) { + const UNKNOWN_CHAN: u16 = 0x4000|10; + const TEMP_CHAN_FAILURE: u16 = 0x4000|7; + match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) { + TEMP_CHAN_FAILURE => { + if err_packet.failuremsg.len() >= 4 { + let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize; + if err_packet.failuremsg.len() >= 4 + update_len { + if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) { + res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage { + msg: chan_update, + }); + } + } + } + }, + UNKNOWN_CHAN => { + // No such next-hop. We know this came from the + // current node as the HMAC validated. + res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed { + short_channel_id: route_hop.short_channel_id + }); + }, + _ => {}, //TODO: Enumerate all of these! + } + } + } + } + }).unwrap(); + Ok(res) + }, + _ => { Ok(None) }, + } + } else { + Ok(None) + } + } + fn internal_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), MsgHandleErrInternal> { let (chan_announcement, chan_update) = { let mut channel_state = self.channel_state.lock().unwrap(); @@ -1974,78 +2050,7 @@ impl ChannelMessageHandler for ChannelManager { } fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result, HandleError> { - let mut channel_state = self.channel_state.lock().unwrap(); - let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) { - Some(chan) => { - if chan.get_their_node_id() != *their_node_id { - return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None}) - } - chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() }) - }, - None => return Err(HandleError{err: "Failed to find corresponding channel", action: None}) - }?; - - if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) { - match pending_htlc { - &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => { - // Handle packed channel/node updates for passing back for the route handler - let mut packet_decrypted = msg.reason.data.clone(); - let mut res = None; - Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| { - if res.is_some() { return; } - - let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret); - - let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len()); - decryption_tmp.resize(packet_decrypted.len(), 0); - let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]); - chacha.process(&packet_decrypted, &mut decryption_tmp[..]); - packet_decrypted = decryption_tmp; - - if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) { - if err_packet.failuremsg.len() >= 2 { - let um = ChannelManager::gen_um_from_shared_secret(&shared_secret); - - let mut hmac = Hmac::new(Sha256::new(), &um); - hmac.input(&err_packet.encode()[32..]); - let mut calc_tag = [0u8; 32]; - hmac.raw_result(&mut calc_tag); - if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) { - const UNKNOWN_CHAN: u16 = 0x4000|10; - const TEMP_CHAN_FAILURE: u16 = 0x4000|7; - match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) { - TEMP_CHAN_FAILURE => { - if err_packet.failuremsg.len() >= 4 { - let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize; - if err_packet.failuremsg.len() >= 4 + update_len { - if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) { - res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage { - msg: chan_update, - }); - } - } - } - }, - UNKNOWN_CHAN => { - // No such next-hop. We know this came from the - // current node as the HMAC validated. - res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed { - short_channel_id: route_hop.short_channel_id - }); - }, - _ => {}, //TODO: Enumerate all of these! - } - } - } - } - }).unwrap(); - Ok(res) - }, - _ => { Ok(None) }, - } - } else { - Ok(None) - } + handle_error!(self, self.internal_update_fail_htlc(their_node_id, msg), their_node_id) } fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> { -- 2.39.5