_ Git - rust-lightning/blob - fuzz/src/onion_message.rs

   1 // Imports that need to be added manually
   2 use bitcoin::bech32::u5;
   3 use bitcoin::blockdata::script::ScriptBuf;
   4 use bitcoin::secp256k1::{PublicKey, Scalar, Secp256k1, SecretKey};
   5 use bitcoin::secp256k1::ecdh::SharedSecret;
   6 use bitcoin::secp256k1::ecdsa::RecoverableSignature;
   7 use bitcoin::secp256k1::schnorr;
   8
   9 use lightning::sign::{Recipient, KeyMaterial, EntropySource, NodeSigner, SignerProvider};
  10 use lightning::ln::features::InitFeatures;
  11 use lightning::ln::msgs::{self, DecodeError, OnionMessageHandler};
  12 use lightning::ln::script::ShutdownScript;
  13 use lightning::offers::invoice::UnsignedBolt12Invoice;
  14 use lightning::offers::invoice_request::UnsignedInvoiceRequest;
  15 use lightning::util::test_channel_signer::TestChannelSigner;
  16 use lightning::util::logger::Logger;
  17 use lightning::util::ser::{Readable, Writeable, Writer};
  18 use lightning::onion_message::{CustomOnionMessageHandler, Destination, MessageRouter, OffersMessage, OffersMessageHandler, OnionMessageContents, OnionMessagePath, OnionMessenger, PendingOnionMessage};
  19
  20 use crate::utils::test_logger;
  21
  22 use std::io::{self, Cursor};
  23 use std::sync::atomic::{AtomicU64, Ordering};
  24
  25 #[inline]
  26 /// Actual fuzz test, method signature and name are fixed
  27 pub fn do_test<L: Logger>(data: &[u8], logger: &L) {
  28         if let Ok(msg) = <msgs::OnionMessage as Readable>::read(&mut Cursor::new(data)) {
  29                 let mut secret_bytes = [1; 32];
  30                 secret_bytes[31] = 2;
  31                 let secret = SecretKey::from_slice(&secret_bytes).unwrap();
  32                 let keys_manager = KeyProvider {
  33                         node_secret: secret,
  34                         counter: AtomicU64::new(0),
  35                 };
  36                 let message_router = TestMessageRouter {};
  37                 let offers_msg_handler = TestOffersMessageHandler {};
  38                 let custom_msg_handler = TestCustomMessageHandler {};
  39                 let onion_messenger = OnionMessenger::new(
  40                         &keys_manager, &keys_manager, logger, &message_router, &offers_msg_handler,
  41                         &custom_msg_handler
  42                 );
  43
  44                 let peer_node_id = {
  45                         let mut secret_bytes = [0; 32];
  46                         secret_bytes[31] = 2;
  47                         let secret = SecretKey::from_slice(&secret_bytes).unwrap();
  48                         PublicKey::from_secret_key(&Secp256k1::signing_only(), &secret)
  49                 };
  50
  51                 let mut features = InitFeatures::empty();
  52                 features.set_onion_messages_optional();
  53                 let init = msgs::Init { features, networks: None, remote_network_address: None };
  54
  55                 onion_messenger.peer_connected(&peer_node_id, &init, false).unwrap();
  56                 onion_messenger.handle_onion_message(&peer_node_id, &msg);
  57         }
  58 }
  59
  60 /// Method that needs to be added manually, {name}_test
  61 pub fn onion_message_test<Out: test_logger::Output>(data: &[u8], out: Out) {
  62         let logger = test_logger::TestLogger::new("".to_owned(), out);
  63         do_test(data, &logger);
  64 }
  65
  66 /// Method that needs to be added manually, {name}_run
  67 #[no_mangle]
  68 pub extern "C" fn onion_message_run(data: *const u8, datalen: usize) {
  69         let logger = test_logger::TestLogger::new("".to_owned(), test_logger::DevNull {});
  70         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, &logger);
  71 }
  72
  73 struct TestMessageRouter {}
  74
  75 impl MessageRouter for TestMessageRouter {
  76         fn find_path(
  77                 &self, _sender: PublicKey, _peers: Vec<PublicKey>, destination: Destination
  78         ) -> Result<OnionMessagePath, ()> {
  79                 Ok(OnionMessagePath {
  80                         intermediate_nodes: vec![],
  81                         destination,
  82                         first_node_addresses: None,
  83                 })
  84         }
  85 }
  86
  87 struct TestOffersMessageHandler {}
  88
  89 impl OffersMessageHandler for TestOffersMessageHandler {
  90         fn handle_message(&self, _message: OffersMessage) -> Option<OffersMessage> {
  91                 None
  92         }
  93 }
  94
  95 #[derive(Debug)]
  96 struct TestCustomMessage {}
  97
  98 const CUSTOM_MESSAGE_TYPE: u64 = 4242;
  99 const CUSTOM_MESSAGE_CONTENTS: [u8; 32] = [42; 32];
 100
 101 impl OnionMessageContents for TestCustomMessage {
 102         fn tlv_type(&self) -> u64 {
 103                 CUSTOM_MESSAGE_TYPE
 104         }
 105 }
 106
 107 impl Writeable for TestCustomMessage {
 108         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 109                 Ok(CUSTOM_MESSAGE_CONTENTS.write(w)?)
 110         }
 111 }
 112
 113 struct TestCustomMessageHandler {}
 114
 115 impl CustomOnionMessageHandler for TestCustomMessageHandler {
 116         type CustomMessage = TestCustomMessage;
 117         fn handle_custom_message(&self, _msg: Self::CustomMessage) -> Option<Self::CustomMessage> {
 118                 Some(TestCustomMessage {})
 119         }
 120         fn read_custom_message<R: io::Read>(&self, _message_type: u64, buffer: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError> {
 121                 let mut buf = Vec::new();
 122                 buffer.read_to_end(&mut buf)?;
 123                 return Ok(Some(TestCustomMessage {}))
 124         }
 125         fn release_pending_custom_messages(&self) -> Vec<PendingOnionMessage<Self::CustomMessage>> {
 126                 vec![]
 127         }
 128 }
 129
 130 pub struct VecWriter(pub Vec<u8>);
 131 impl Writer for VecWriter {
 132         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 133                 self.0.extend_from_slice(buf);
 134                 Ok(())
 135         }
 136 }
 137 struct KeyProvider {
 138         node_secret: SecretKey,
 139         counter: AtomicU64,
 140 }
 141
 142 impl EntropySource for KeyProvider {
 143         fn get_secure_random_bytes(&self) -> [u8; 32] {
 144                 let ctr = self.counter.fetch_add(1, Ordering::Relaxed);
 145                 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 146                         (ctr >> 8*7) as u8, (ctr >> 8*6) as u8, (ctr >> 8*5) as u8, (ctr >> 8*4) as u8, (ctr >> 8*3) as u8, (ctr >> 8*2) as u8, (ctr >> 8*1) as u8, 14, (ctr >> 8*0) as u8]
 147         }
 148 }
 149
 150 impl NodeSigner for KeyProvider {
 151         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 152                 let node_secret = match recipient {
 153                         Recipient::Node => Ok(&self.node_secret),
 154                         Recipient::PhantomNode => Err(())
 155                 }?;
 156                 Ok(PublicKey::from_secret_key(&Secp256k1::signing_only(), node_secret))
 157         }
 158
 159         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 160                 let mut node_secret = match recipient {
 161                         Recipient::Node => Ok(self.node_secret.clone()),
 162                         Recipient::PhantomNode => Err(())
 163                 }?;
 164                 if let Some(tweak) = tweak {
 165                         node_secret = node_secret.mul_tweak(tweak).map_err(|_| ())?;
 166                 }
 167                 Ok(SharedSecret::new(other_key, &node_secret))
 168         }
 169
 170         fn get_inbound_payment_key_material(&self) -> KeyMaterial { unreachable!() }
 171
 172         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 173                 unreachable!()
 174         }
 175
 176         fn sign_bolt12_invoice_request(
 177                 &self, _invoice_request: &UnsignedInvoiceRequest
 178         ) -> Result<schnorr::Signature, ()> {
 179                 unreachable!()
 180         }
 181
 182         fn sign_bolt12_invoice(
 183                 &self, _invoice: &UnsignedBolt12Invoice,
 184         ) -> Result<schnorr::Signature, ()> {
 185                 unreachable!()
 186         }
 187
 188         fn sign_gossip_message(&self, _msg: lightning::ln::msgs::UnsignedGossipMessage) -> Result<bitcoin::secp256k1::ecdsa::Signature, ()> {
 189                 unreachable!()
 190         }
 191 }
 192
 193 impl SignerProvider for KeyProvider {
 194         type EcdsaSigner = TestChannelSigner;
 195         #[cfg(taproot)]
 196         type TaprootSigner = TestChannelSigner;
 197
 198         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] { unreachable!() }
 199
 200         fn derive_channel_signer(&self, _channel_value_satoshis: u64, _channel_keys_id: [u8; 32]) -> Self::EcdsaSigner {
 201                 unreachable!()
 202         }
 203
 204         fn read_chan_signer(&self, _data: &[u8]) -> Result<TestChannelSigner, DecodeError> { unreachable!() }
 205
 206         fn get_destination_script(&self, _channel_keys_id: [u8; 32]) -> Result<ScriptBuf, ()> { unreachable!() }
 207
 208         fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> { unreachable!() }
 209 }
 210
 211 #[cfg(test)]
 212 mod tests {
 213         use bitcoin::hashes::hex::FromHex;
 214         use lightning::util::logger::{Logger, Record};
 215         use std::collections::HashMap;
 216         use std::sync::Mutex;
 217
 218         struct TrackingLogger {
 219                 /// (module, message) -> count
 220                 pub lines: Mutex<HashMap<(String, String), usize>>,
 221         }
 222         impl Logger for TrackingLogger {
 223                 fn log(&self, record: Record) {
 224                         *self.lines.lock().unwrap().entry((record.module_path.to_string(), format!("{}", record.args))).or_insert(0) += 1;
 225                         println!("{:<5} [{} : {}, {}] {}", record.level.to_string(), record.module_path, record.file, record.line, record.args);
 226                 }
 227         }
 228
 229         #[test]
 230         fn test_no_onion_message_breakage() {
 231                 let one_hop_om = "\
 232                         020000000000000000000000000000000000000000000000000000000000000e01055600020000000000000\
 233                         000000000000000000000000000000000000000000000000e01ae0276020000000000000000000000000000\
 234                         000000000000000000000000000000000002020000000000000000000000000000000000000000000000000\
 235                         000000000000e0101022a0000000000000000000000000000014551231950b75fc4402da1732fc9bebf0010\
 236                         9500000000000000000000000000000004106d000000000000000000000000000000fd1092202a2a2a2a2a2\
 237                         a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a0000000000000000000000000000000000\
 238                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 239                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 240                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 241                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 242                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 243                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 244                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 245                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 246                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 247                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 248                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 249                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 250                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 251                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 252                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 253                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 254                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 255                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 256                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 257                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 258                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 259                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 260                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 261                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 262                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 263                         000000000000000000000000000000000000000005600000000000000000000000000000000000000000000\
 264                         000000000000000000";
 265                 let logger = TrackingLogger { lines: Mutex::new(HashMap::new()) };
 266                 super::do_test(&<Vec<u8>>::from_hex(one_hop_om).unwrap(), &logger);
 267                 {
 268                         let log_entries = logger.lines.lock().unwrap();
 269                         assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(),
 270                                                 "Received an onion message with path_id None and a reply_path: Custom(TestCustomMessage)"
 271                                                 .to_string())), Some(&1));
 272                         assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(),
 273                                                 "Constructing onion message when responding to Custom onion message with path_id None: TestCustomMessage".to_string())), Some(&1));
 274                         assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(),
 275                                                 "Buffered onion message when responding to Custom onion message with path_id None".to_string())), Some(&1));
 276                 }
 277
 278                 let two_unblinded_hops_om = "\
 279                         020000000000000000000000000000000000000000000000000000000000000e01055600020000000000000\
 280                         000000000000000000000000000000000000000000000000e01350433042102020202020202020202020202\
 281                         02020202020202020202020202020202020202026d000000000000000000000000000000eb0000000000000\
 282                         000000000000000000000000000000000000000000000000036041096000000000000000000000000000000\
 283                         fd1092202a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a000000000000000\
 284                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 285                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 286                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 287                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 288                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 289                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 290                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 291                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 292                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 293                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 294                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 295                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 296                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 297                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 298                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 299                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 300                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 301                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 302                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 303                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 304                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 305                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 306                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 307                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 308                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 309                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 310                         000000000000000000000000000000000000000004800000000000000000000000000000000000000000000\
 311                         000000000000000000";
 312                 let logger = TrackingLogger { lines: Mutex::new(HashMap::new()) };
 313                 super::do_test(&<Vec<u8>>::from_hex(two_unblinded_hops_om).unwrap(), &logger);
 314                 {
 315                         let log_entries = logger.lines.lock().unwrap();
 316                         assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(), "Forwarding an onion message to peer 020202020202020202020202020202020202020202020202020202020202020202".to_string())), Some(&1));
 317                 }
 318
 319                 let two_unblinded_two_blinded_om = "\
 320                         020000000000000000000000000000000000000000000000000000000000000e01055600020000000000000\
 321                         000000000000000000000000000000000000000000000000e01350433042102020202020202020202020202\
 322                         02020202020202020202020202020202020202026d0000000000000000000000000000009e0000000000000\
 323                         000000000000000000000000000000000000000000000000058045604210203030303030303030303030303\
 324                         030303030303030303030303030303030303020821020000000000000000000000000000000000000000000\
 325                         000000000000000000e0196000000000000000000000000000000e900000000000000000000000000000000\
 326                         000000000000000000000000000000350433042102040404040404040404040404040404040404040404040\
 327                         4040404040404040402ca000000000000000000000000000000420000000000000000000000000000000000\
 328                         00000000000000000000000000003604103f000000000000000000000000000000fd1092202a2a2a2a2a2a2\
 329                         a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a000000000000000000000000000000000000\
 330                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 331                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 332                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 333                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 334                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 335                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 336                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 337                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 338                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 339                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 340                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 341                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 342                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 343                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 344                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 345                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 346                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 347                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 348                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 349                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 350                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 351                         000000000000000000000000000000000000000004800000000000000000000000000000000000000000000\
 352                         000000000000000000";
 353                 let logger = TrackingLogger { lines: Mutex::new(HashMap::new()) };
 354                 super::do_test(&<Vec<u8>>::from_hex(two_unblinded_two_blinded_om).unwrap(), &logger);
 355                 {
 356                         let log_entries = logger.lines.lock().unwrap();
 357                         assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(), "Forwarding an onion message to peer 020202020202020202020202020202020202020202020202020202020202020202".to_string())), Some(&1));
 358                 }
 359
 360                 let three_blinded_om = "\
 361                         020000000000000000000000000000000000000000000000000000000000000e01055600020000000000000\
 362                         000000000000000000000000000000000000000000000000e01350433042102020202020202020202020202\
 363                         02020202020202020202020202020202020202026d000000000000000000000000000000b20000000000000\
 364                         000000000000000000000000000000000000000000000000035043304210203030303030303030303030303\
 365                         030303030303030303030303030303030303029600000000000000000000000000000033000000000000000\
 366                         000000000000000000000000000000000000000000000003604104e000000000000000000000000000000fd\
 367                         1092202a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a00000000000000000\
 368                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 369                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 370                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 371                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 372                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 373                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 374                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 375                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 376                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 377                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 378                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 379                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 380                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 381                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 382                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 383                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 384                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 385                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 386                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 387                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 388                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 389                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 390                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 391                         000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\
 392                         000000000000000000000000000000000000000004800000000000000000000000000000000000000000000\
 393                         000000000000000000";
 394                 let logger = TrackingLogger { lines: Mutex::new(HashMap::new()) };
 395                 super::do_test(&<Vec<u8>>::from_hex(three_blinded_om).unwrap(), &logger);
 396                 {
 397                         let log_entries = logger.lines.lock().unwrap();
 398                         assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(), "Forwarding an onion message to peer 020202020202020202020202020202020202020202020202020202020202020202".to_string())), Some(&1));
 399                 }
 400         }
 401 }