Jędrzej Stuczyński
b564cd935e
* Moved 'addressing' to nymsphinx + slightly better API + tests * Replaced all usages of above in the project * Removed 'split_and_encapsulate_message' from chunking API to get rid of circular dependency + to prefer usage of TopologyAccessor * changes in Cargo.lock * formatting
110 lines
3.4 KiB
Rust
110 lines
3.4 KiB
Rust
use crate::node::metrics;
|
|
use crypto::encryption;
|
|
use log::*;
|
|
use nymsphinx::addressing::nodes::{NymNodeRoutingAddress, NymNodeRoutingAddressError};
|
|
use sphinx::header::delays::Delay as SphinxDelay;
|
|
use sphinx::route::NodeAddressBytes;
|
|
use sphinx::{ProcessedPacket, SphinxPacket};
|
|
use std::convert::TryFrom;
|
|
use std::net::SocketAddr;
|
|
use std::ops::Deref;
|
|
use std::sync::Arc;
|
|
|
|
#[derive(Debug)]
|
|
pub enum MixProcessingError {
|
|
SphinxRecoveryError,
|
|
ReceivedFinalHopError,
|
|
SphinxProcessingError,
|
|
InvalidHopAddress,
|
|
}
|
|
|
|
pub enum MixProcessingResult {
|
|
ForwardHop(SocketAddr, Vec<u8>),
|
|
#[allow(dead_code)]
|
|
LoopMessage,
|
|
}
|
|
|
|
impl From<sphinx::ProcessingError> for MixProcessingError {
|
|
// for time being just have a single error instance for all possible results of sphinx::ProcessingError
|
|
fn from(_: sphinx::ProcessingError) -> Self {
|
|
use MixProcessingError::*;
|
|
|
|
SphinxRecoveryError
|
|
}
|
|
}
|
|
|
|
impl From<NymNodeRoutingAddressError> for MixProcessingError {
|
|
fn from(_: NymNodeRoutingAddressError) -> Self {
|
|
use MixProcessingError::*;
|
|
|
|
InvalidHopAddress
|
|
}
|
|
}
|
|
|
|
// PacketProcessor contains all data required to correctly unwrap and forward sphinx packets
|
|
#[derive(Clone)]
|
|
pub struct PacketProcessor {
|
|
secret_key: Arc<encryption::PrivateKey>,
|
|
metrics_reporter: metrics::MetricsReporter,
|
|
}
|
|
|
|
impl PacketProcessor {
|
|
pub(crate) fn new(
|
|
secret_key: encryption::PrivateKey,
|
|
metrics_reporter: metrics::MetricsReporter,
|
|
) -> Self {
|
|
PacketProcessor {
|
|
secret_key: Arc::new(secret_key),
|
|
metrics_reporter,
|
|
}
|
|
}
|
|
|
|
pub(crate) fn report_sent(&self, addr: SocketAddr) {
|
|
self.metrics_reporter.report_sent(addr.to_string())
|
|
}
|
|
|
|
async fn process_forward_hop(
|
|
&self,
|
|
packet: SphinxPacket,
|
|
forward_address: NodeAddressBytes,
|
|
delay: SphinxDelay,
|
|
) -> Result<MixProcessingResult, MixProcessingError> {
|
|
let next_hop_address: SocketAddr = NymNodeRoutingAddress::try_from(forward_address)?.into();
|
|
|
|
// Delay packet for as long as required
|
|
tokio::time::delay_for(delay.to_duration()).await;
|
|
|
|
Ok(MixProcessingResult::ForwardHop(
|
|
next_hop_address,
|
|
packet.to_bytes(),
|
|
))
|
|
}
|
|
|
|
pub(crate) async fn process_sphinx_packet(
|
|
&self,
|
|
raw_packet_data: [u8; sphinx::PACKET_SIZE],
|
|
) -> Result<MixProcessingResult, MixProcessingError> {
|
|
// we received something resembling a sphinx packet, report it!
|
|
self.metrics_reporter.report_received();
|
|
|
|
let packet = SphinxPacket::from_bytes(&raw_packet_data)?;
|
|
|
|
match packet.process(self.secret_key.deref().inner()) {
|
|
Ok(ProcessedPacket::ProcessedPacketForwardHop(packet, address, delay)) => {
|
|
self.process_forward_hop(packet, address, delay).await
|
|
}
|
|
Ok(ProcessedPacket::ProcessedPacketFinalHop(_, _, _)) => {
|
|
warn!("Received a loop cover message that we haven't implemented yet!");
|
|
Err(MixProcessingError::ReceivedFinalHopError)
|
|
}
|
|
Err(e) => {
|
|
warn!("Failed to unwrap Sphinx packet: {:?}", e);
|
|
Err(MixProcessingError::SphinxProcessingError)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// TODO: the test that definitely needs to be written is as follows:
|
|
// we are stuck trying to write to mix A, can we still forward just fine to mix B?
|