git.bitcoin.ninja Git - rust-lightning/blob - lightning/src/ln/wire.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Wire encoding/decoding for Lightning messages according to [BOLT #1], and for
  11 //! custom message through the [`CustomMessageReader`] trait.
  12 //!
  13 //! [BOLT #1]: https://github.com/lightning/bolts/blob/master/01-messaging.md
  14
  15 use crate::io;
  16 use crate::ln::msgs;
  17 use crate::util::ser::{Readable, Writeable, Writer};
  18
  19 /// Trait to be implemented by custom message (unrelated to the channel/gossip LN layers)
  20 /// decoders.
  21 pub trait CustomMessageReader {
  22         /// The type of the message decoded by the implementation.
  23         type CustomMessage: Type;
  24         /// Decodes a custom message to `CustomMessageType`. If the given message type is known to the
  25         /// implementation and the message could be decoded, must return `Ok(Some(message))`. If the
  26         /// message type is unknown to the implementation, must return `Ok(None)`. If a decoding error
  27         /// occur, must return `Err(DecodeError::X)` where `X` details the encountered error.
  28         fn read<R: io::Read>(&self, message_type: u16, buffer: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError>;
  29 }
  30
  31 // TestEq is a dummy trait which requires PartialEq when built in testing, and otherwise is
  32 // blanket-implemented for all types.
  33
  34 #[cfg(test)]
  35 pub trait TestEq : PartialEq {}
  36 #[cfg(test)]
  37 impl<T: PartialEq> TestEq for T {}
  38
  39 #[cfg(not(test))]
  40 pub(crate) trait TestEq {}
  41 #[cfg(not(test))]
  42 impl<T> TestEq for T {}
  43
  44
  45 /// A Lightning message returned by [`read`] when decoding bytes received over the wire. Each
  46 /// variant contains a message from [`msgs`] or otherwise the message type if unknown.
  47 #[allow(missing_docs)]
  48 #[derive(Debug)]
  49 #[cfg_attr(test, derive(PartialEq))]
  50 pub(crate) enum Message<T> where T: core::fmt::Debug + Type + TestEq {
  51         Init(msgs::Init),
  52         Error(msgs::ErrorMessage),
  53         Warning(msgs::WarningMessage),
  54         Ping(msgs::Ping),
  55         Pong(msgs::Pong),
  56         OpenChannel(msgs::OpenChannel),
  57         OpenChannelV2(msgs::OpenChannelV2),
  58         AcceptChannel(msgs::AcceptChannel),
  59         AcceptChannelV2(msgs::AcceptChannelV2),
  60         FundingCreated(msgs::FundingCreated),
  61         FundingSigned(msgs::FundingSigned),
  62         Stfu(msgs::Stfu),
  63         Splice(msgs::Splice),
  64         SpliceAck(msgs::SpliceAck),
  65         SpliceLocked(msgs::SpliceLocked),
  66         TxAddInput(msgs::TxAddInput),
  67         TxAddOutput(msgs::TxAddOutput),
  68         TxRemoveInput(msgs::TxRemoveInput),
  69         TxRemoveOutput(msgs::TxRemoveOutput),
  70         TxComplete(msgs::TxComplete),
  71         TxSignatures(msgs::TxSignatures),
  72         TxInitRbf(msgs::TxInitRbf),
  73         TxAckRbf(msgs::TxAckRbf),
  74         TxAbort(msgs::TxAbort),
  75         ChannelReady(msgs::ChannelReady),
  76         Shutdown(msgs::Shutdown),
  77         ClosingSigned(msgs::ClosingSigned),
  78         OnionMessage(msgs::OnionMessage),
  79         UpdateAddHTLC(msgs::UpdateAddHTLC),
  80         UpdateFulfillHTLC(msgs::UpdateFulfillHTLC),
  81         UpdateFailHTLC(msgs::UpdateFailHTLC),
  82         UpdateFailMalformedHTLC(msgs::UpdateFailMalformedHTLC),
  83         CommitmentSigned(msgs::CommitmentSigned),
  84         RevokeAndACK(msgs::RevokeAndACK),
  85         UpdateFee(msgs::UpdateFee),
  86         ChannelReestablish(msgs::ChannelReestablish),
  87         AnnouncementSignatures(msgs::AnnouncementSignatures),
  88         ChannelAnnouncement(msgs::ChannelAnnouncement),
  89         NodeAnnouncement(msgs::NodeAnnouncement),
  90         ChannelUpdate(msgs::ChannelUpdate),
  91         QueryShortChannelIds(msgs::QueryShortChannelIds),
  92         ReplyShortChannelIdsEnd(msgs::ReplyShortChannelIdsEnd),
  93         QueryChannelRange(msgs::QueryChannelRange),
  94         ReplyChannelRange(msgs::ReplyChannelRange),
  95         GossipTimestampFilter(msgs::GossipTimestampFilter),
  96         /// A message that could not be decoded because its type is unknown.
  97         Unknown(u16),
  98         /// A message that was produced by a [`CustomMessageReader`] and is to be handled by a
  99         /// [`crate::ln::peer_handler::CustomMessageHandler`].
 100         Custom(T),
 101 }
 102
 103 impl<T> Writeable for Message<T> where T: core::fmt::Debug + Type + TestEq {
 104         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 105                 match self {
 106                         &Message::Init(ref msg) => msg.write(writer),
 107                         &Message::Error(ref msg) => msg.write(writer),
 108                         &Message::Warning(ref msg) => msg.write(writer),
 109                         &Message::Ping(ref msg) => msg.write(writer),
 110                         &Message::Pong(ref msg) => msg.write(writer),
 111                         &Message::OpenChannel(ref msg) => msg.write(writer),
 112                         &Message::OpenChannelV2(ref msg) => msg.write(writer),
 113                         &Message::AcceptChannel(ref msg) => msg.write(writer),
 114                         &Message::AcceptChannelV2(ref msg) => msg.write(writer),
 115                         &Message::FundingCreated(ref msg) => msg.write(writer),
 116                         &Message::FundingSigned(ref msg) => msg.write(writer),
 117                         &Message::Stfu(ref msg) => msg.write(writer),
 118                         &Message::Splice(ref msg) => msg.write(writer),
 119                         &Message::SpliceAck(ref msg) => msg.write(writer),
 120                         &Message::SpliceLocked(ref msg) => msg.write(writer),
 121                         &Message::TxAddInput(ref msg) => msg.write(writer),
 122                         &Message::TxAddOutput(ref msg) => msg.write(writer),
 123                         &Message::TxRemoveInput(ref msg) => msg.write(writer),
 124                         &Message::TxRemoveOutput(ref msg) => msg.write(writer),
 125                         &Message::TxComplete(ref msg) => msg.write(writer),
 126                         &Message::TxSignatures(ref msg) => msg.write(writer),
 127                         &Message::TxInitRbf(ref msg) => msg.write(writer),
 128                         &Message::TxAckRbf(ref msg) => msg.write(writer),
 129                         &Message::TxAbort(ref msg) => msg.write(writer),
 130                         &Message::ChannelReady(ref msg) => msg.write(writer),
 131                         &Message::Shutdown(ref msg) => msg.write(writer),
 132                         &Message::ClosingSigned(ref msg) => msg.write(writer),
 133                         &Message::OnionMessage(ref msg) => msg.write(writer),
 134                         &Message::UpdateAddHTLC(ref msg) => msg.write(writer),
 135                         &Message::UpdateFulfillHTLC(ref msg) => msg.write(writer),
 136                         &Message::UpdateFailHTLC(ref msg) => msg.write(writer),
 137                         &Message::UpdateFailMalformedHTLC(ref msg) => msg.write(writer),
 138                         &Message::CommitmentSigned(ref msg) => msg.write(writer),
 139                         &Message::RevokeAndACK(ref msg) => msg.write(writer),
 140                         &Message::UpdateFee(ref msg) => msg.write(writer),
 141                         &Message::ChannelReestablish(ref msg) => msg.write(writer),
 142                         &Message::AnnouncementSignatures(ref msg) => msg.write(writer),
 143                         &Message::ChannelAnnouncement(ref msg) => msg.write(writer),
 144                         &Message::NodeAnnouncement(ref msg) => msg.write(writer),
 145                         &Message::ChannelUpdate(ref msg) => msg.write(writer),
 146                         &Message::QueryShortChannelIds(ref msg) => msg.write(writer),
 147                         &Message::ReplyShortChannelIdsEnd(ref msg) => msg.write(writer),
 148                         &Message::QueryChannelRange(ref msg) => msg.write(writer),
 149                         &Message::ReplyChannelRange(ref msg) => msg.write(writer),
 150                         &Message::GossipTimestampFilter(ref msg) => msg.write(writer),
 151                         &Message::Unknown(_) => { Ok(()) },
 152                         &Message::Custom(ref msg) => msg.write(writer),
 153                 }
 154         }
 155 }
 156
 157 impl<T> Type for Message<T> where T: core::fmt::Debug + Type + TestEq {
 158         /// Returns the type that was used to decode the message payload.
 159         fn type_id(&self) -> u16 {
 160                 match self {
 161                         &Message::Init(ref msg) => msg.type_id(),
 162                         &Message::Error(ref msg) => msg.type_id(),
 163                         &Message::Warning(ref msg) => msg.type_id(),
 164                         &Message::Ping(ref msg) => msg.type_id(),
 165                         &Message::Pong(ref msg) => msg.type_id(),
 166                         &Message::OpenChannel(ref msg) => msg.type_id(),
 167                         &Message::OpenChannelV2(ref msg) => msg.type_id(),
 168                         &Message::AcceptChannel(ref msg) => msg.type_id(),
 169                         &Message::AcceptChannelV2(ref msg) => msg.type_id(),
 170                         &Message::FundingCreated(ref msg) => msg.type_id(),
 171                         &Message::FundingSigned(ref msg) => msg.type_id(),
 172                         &Message::Stfu(ref msg) => msg.type_id(),
 173                         &Message::Splice(ref msg) => msg.type_id(),
 174                         &Message::SpliceAck(ref msg) => msg.type_id(),
 175                         &Message::SpliceLocked(ref msg) => msg.type_id(),
 176                         &Message::TxAddInput(ref msg) => msg.type_id(),
 177                         &Message::TxAddOutput(ref msg) => msg.type_id(),
 178                         &Message::TxRemoveInput(ref msg) => msg.type_id(),
 179                         &Message::TxRemoveOutput(ref msg) => msg.type_id(),
 180                         &Message::TxComplete(ref msg) => msg.type_id(),
 181                         &Message::TxSignatures(ref msg) => msg.type_id(),
 182                         &Message::TxInitRbf(ref msg) => msg.type_id(),
 183                         &Message::TxAckRbf(ref msg) => msg.type_id(),
 184                         &Message::TxAbort(ref msg) => msg.type_id(),
 185                         &Message::ChannelReady(ref msg) => msg.type_id(),
 186                         &Message::Shutdown(ref msg) => msg.type_id(),
 187                         &Message::ClosingSigned(ref msg) => msg.type_id(),
 188                         &Message::OnionMessage(ref msg) => msg.type_id(),
 189                         &Message::UpdateAddHTLC(ref msg) => msg.type_id(),
 190                         &Message::UpdateFulfillHTLC(ref msg) => msg.type_id(),
 191                         &Message::UpdateFailHTLC(ref msg) => msg.type_id(),
 192                         &Message::UpdateFailMalformedHTLC(ref msg) => msg.type_id(),
 193                         &Message::CommitmentSigned(ref msg) => msg.type_id(),
 194                         &Message::RevokeAndACK(ref msg) => msg.type_id(),
 195                         &Message::UpdateFee(ref msg) => msg.type_id(),
 196                         &Message::ChannelReestablish(ref msg) => msg.type_id(),
 197                         &Message::AnnouncementSignatures(ref msg) => msg.type_id(),
 198                         &Message::ChannelAnnouncement(ref msg) => msg.type_id(),
 199                         &Message::NodeAnnouncement(ref msg) => msg.type_id(),
 200                         &Message::ChannelUpdate(ref msg) => msg.type_id(),
 201                         &Message::QueryShortChannelIds(ref msg) => msg.type_id(),
 202                         &Message::ReplyShortChannelIdsEnd(ref msg) => msg.type_id(),
 203                         &Message::QueryChannelRange(ref msg) => msg.type_id(),
 204                         &Message::ReplyChannelRange(ref msg) => msg.type_id(),
 205                         &Message::GossipTimestampFilter(ref msg) => msg.type_id(),
 206                         &Message::Unknown(type_id) => type_id,
 207                         &Message::Custom(ref msg) => msg.type_id(),
 208                 }
 209         }
 210 }
 211
 212 impl<T> Message<T> where T: core::fmt::Debug + Type + TestEq {
 213         /// Returns whether the message's type is even, indicating both endpoints must support it.
 214         pub fn is_even(&self) -> bool {
 215                 (self.type_id() & 1) == 0
 216         }
 217 }
 218
 219 /// Reads a message from the data buffer consisting of a 2-byte big-endian type and a
 220 /// variable-length payload conforming to the type.
 221 ///
 222 /// # Errors
 223 ///
 224 /// Returns an error if the message payload could not be decoded as the specified type.
 225 pub(crate) fn read<R: io::Read, T, H: core::ops::Deref>(buffer: &mut R, custom_reader: H)
 226 -> Result<Message<T>, (msgs::DecodeError, Option<u16>)> where
 227         T: core::fmt::Debug + Type + Writeable,
 228         H::Target: CustomMessageReader<CustomMessage = T>,
 229 {
 230         let message_type = <u16 as Readable>::read(buffer).map_err(|e| (e, None))?;
 231         do_read(buffer, message_type, custom_reader).map_err(|e| (e, Some(message_type)))
 232 }
 233
 234 fn do_read<R: io::Read, T, H: core::ops::Deref>(buffer: &mut R, message_type: u16, custom_reader: H)
 235 -> Result<Message<T>, msgs::DecodeError> where
 236         T: core::fmt::Debug + Type + Writeable,
 237         H::Target: CustomMessageReader<CustomMessage = T>,
 238 {
 239         match message_type {
 240                 msgs::Init::TYPE => {
 241                         Ok(Message::Init(Readable::read(buffer)?))
 242                 },
 243                 msgs::ErrorMessage::TYPE => {
 244                         Ok(Message::Error(Readable::read(buffer)?))
 245                 },
 246                 msgs::WarningMessage::TYPE => {
 247                         Ok(Message::Warning(Readable::read(buffer)?))
 248                 },
 249                 msgs::Ping::TYPE => {
 250                         Ok(Message::Ping(Readable::read(buffer)?))
 251                 },
 252                 msgs::Pong::TYPE => {
 253                         Ok(Message::Pong(Readable::read(buffer)?))
 254                 },
 255                 msgs::OpenChannel::TYPE => {
 256                         Ok(Message::OpenChannel(Readable::read(buffer)?))
 257                 },
 258                 msgs::OpenChannelV2::TYPE => {
 259                         Ok(Message::OpenChannelV2(Readable::read(buffer)?))
 260                 },
 261                 msgs::AcceptChannel::TYPE => {
 262                         Ok(Message::AcceptChannel(Readable::read(buffer)?))
 263                 },
 264                 msgs::AcceptChannelV2::TYPE => {
 265                         Ok(Message::AcceptChannelV2(Readable::read(buffer)?))
 266                 },
 267                 msgs::FundingCreated::TYPE => {
 268                         Ok(Message::FundingCreated(Readable::read(buffer)?))
 269                 },
 270                 msgs::FundingSigned::TYPE => {
 271                         Ok(Message::FundingSigned(Readable::read(buffer)?))
 272                 },
 273                 msgs::Splice::TYPE => {
 274                         Ok(Message::Splice(Readable::read(buffer)?))
 275                 },
 276                 msgs::Stfu::TYPE => {
 277                         Ok(Message::Stfu(Readable::read(buffer)?))
 278                 },
 279                 msgs::SpliceAck::TYPE => {
 280                         Ok(Message::SpliceAck(Readable::read(buffer)?))
 281                 },
 282                 msgs::SpliceLocked::TYPE => {
 283                         Ok(Message::SpliceLocked(Readable::read(buffer)?))
 284                 },
 285                 msgs::TxAddInput::TYPE => {
 286                         Ok(Message::TxAddInput(Readable::read(buffer)?))
 287                 },
 288                 msgs::TxAddOutput::TYPE => {
 289                         Ok(Message::TxAddOutput(Readable::read(buffer)?))
 290                 },
 291                 msgs::TxRemoveInput::TYPE => {
 292                         Ok(Message::TxRemoveInput(Readable::read(buffer)?))
 293                 },
 294                 msgs::TxRemoveOutput::TYPE => {
 295                         Ok(Message::TxRemoveOutput(Readable::read(buffer)?))
 296                 },
 297                 msgs::TxComplete::TYPE => {
 298                         Ok(Message::TxComplete(Readable::read(buffer)?))
 299                 },
 300                 msgs::TxSignatures::TYPE => {
 301                         Ok(Message::TxSignatures(Readable::read(buffer)?))
 302                 },
 303                 msgs::TxInitRbf::TYPE => {
 304                         Ok(Message::TxInitRbf(Readable::read(buffer)?))
 305                 },
 306                 msgs::TxAckRbf::TYPE => {
 307                         Ok(Message::TxAckRbf(Readable::read(buffer)?))
 308                 },
 309                 msgs::TxAbort::TYPE => {
 310                         Ok(Message::TxAbort(Readable::read(buffer)?))
 311                 },
 312                 msgs::ChannelReady::TYPE => {
 313                         Ok(Message::ChannelReady(Readable::read(buffer)?))
 314                 },
 315                 msgs::Shutdown::TYPE => {
 316                         Ok(Message::Shutdown(Readable::read(buffer)?))
 317                 },
 318                 msgs::ClosingSigned::TYPE => {
 319                         Ok(Message::ClosingSigned(Readable::read(buffer)?))
 320                 },
 321                 msgs::OnionMessage::TYPE => {
 322                         Ok(Message::OnionMessage(Readable::read(buffer)?))
 323                 },
 324                 msgs::UpdateAddHTLC::TYPE => {
 325                         Ok(Message::UpdateAddHTLC(Readable::read(buffer)?))
 326                 },
 327                 msgs::UpdateFulfillHTLC::TYPE => {
 328                         Ok(Message::UpdateFulfillHTLC(Readable::read(buffer)?))
 329                 },
 330                 msgs::UpdateFailHTLC::TYPE => {
 331                         Ok(Message::UpdateFailHTLC(Readable::read(buffer)?))
 332                 },
 333                 msgs::UpdateFailMalformedHTLC::TYPE => {
 334                         Ok(Message::UpdateFailMalformedHTLC(Readable::read(buffer)?))
 335                 },
 336                 msgs::CommitmentSigned::TYPE => {
 337                         Ok(Message::CommitmentSigned(Readable::read(buffer)?))
 338                 },
 339                 msgs::RevokeAndACK::TYPE => {
 340                         Ok(Message::RevokeAndACK(Readable::read(buffer)?))
 341                 },
 342                 msgs::UpdateFee::TYPE => {
 343                         Ok(Message::UpdateFee(Readable::read(buffer)?))
 344                 },
 345                 msgs::ChannelReestablish::TYPE => {
 346                         Ok(Message::ChannelReestablish(Readable::read(buffer)?))
 347                 },
 348                 msgs::AnnouncementSignatures::TYPE => {
 349                         Ok(Message::AnnouncementSignatures(Readable::read(buffer)?))
 350                 },
 351                 msgs::ChannelAnnouncement::TYPE => {
 352                         Ok(Message::ChannelAnnouncement(Readable::read(buffer)?))
 353                 },
 354                 msgs::NodeAnnouncement::TYPE => {
 355                         Ok(Message::NodeAnnouncement(Readable::read(buffer)?))
 356                 },
 357                 msgs::ChannelUpdate::TYPE => {
 358                         Ok(Message::ChannelUpdate(Readable::read(buffer)?))
 359                 },
 360                 msgs::QueryShortChannelIds::TYPE => {
 361                         Ok(Message::QueryShortChannelIds(Readable::read(buffer)?))
 362                 },
 363                 msgs::ReplyShortChannelIdsEnd::TYPE => {
 364                         Ok(Message::ReplyShortChannelIdsEnd(Readable::read(buffer)?))
 365                 },
 366                 msgs::QueryChannelRange::TYPE => {
 367                         Ok(Message::QueryChannelRange(Readable::read(buffer)?))
 368                 },
 369                 msgs::ReplyChannelRange::TYPE => {
 370                         Ok(Message::ReplyChannelRange(Readable::read(buffer)?))
 371                 }
 372                 msgs::GossipTimestampFilter::TYPE => {
 373                         Ok(Message::GossipTimestampFilter(Readable::read(buffer)?))
 374                 },
 375                 _ => {
 376                         if let Some(custom) = custom_reader.read(message_type, buffer)? {
 377                                 Ok(Message::Custom(custom))
 378                         } else {
 379                                 Ok(Message::Unknown(message_type))
 380                         }
 381                 },
 382         }
 383 }
 384
 385 /// Writes a message to the data buffer encoded as a 2-byte big-endian type and a variable-length
 386 /// payload.
 387 ///
 388 /// # Errors
 389 ///
 390 /// Returns an I/O error if the write could not be completed.
 391 pub(crate) fn write<M: Type + Writeable, W: Writer>(message: &M, buffer: &mut W) -> Result<(), io::Error> {
 392         message.type_id().write(buffer)?;
 393         message.write(buffer)
 394 }
 395
 396 mod encode {
 397         /// Defines a constant type identifier for reading messages from the wire.
 398         pub trait Encode {
 399                 /// The type identifying the message payload.
 400                 const TYPE: u16;
 401         }
 402 }
 403
 404 pub(crate) use self::encode::Encode;
 405
 406 #[cfg(not(test))]
 407 /// Defines a type identifier for sending messages over the wire.
 408 ///
 409 /// Messages implementing this trait specify a type and must be [`Writeable`].
 410 pub trait Type: core::fmt::Debug + Writeable {
 411         /// Returns the type identifying the message payload.
 412         fn type_id(&self) -> u16;
 413 }
 414
 415 #[cfg(test)]
 416 pub trait Type: core::fmt::Debug + Writeable + PartialEq {
 417         fn type_id(&self) -> u16;
 418 }
 419
 420 #[cfg(any(feature = "_test_utils", fuzzing, test))]
 421 impl Type for () {
 422         fn type_id(&self) -> u16 { unreachable!(); }
 423 }
 424
 425 #[cfg(test)]
 426 impl<T: core::fmt::Debug + Writeable + PartialEq> Type for T where T: Encode {
 427         fn type_id(&self) -> u16 { T::TYPE }
 428 }
 429
 430 #[cfg(not(test))]
 431 impl<T: core::fmt::Debug + Writeable> Type for T where T: Encode {
 432         fn type_id(&self) -> u16 { T::TYPE }
 433 }
 434
 435 impl Encode for msgs::Stfu {
 436         const TYPE: u16 = 2;
 437 }
 438
 439 impl Encode for msgs::Init {
 440         const TYPE: u16 = 16;
 441 }
 442
 443 impl Encode for msgs::ErrorMessage {
 444         const TYPE: u16 = 17;
 445 }
 446
 447 impl Encode for msgs::WarningMessage {
 448         const TYPE: u16 = 1;
 449 }
 450
 451 impl Encode for msgs::Ping {
 452         const TYPE: u16 = 18;
 453 }
 454
 455 impl Encode for msgs::Pong {
 456         const TYPE: u16 = 19;
 457 }
 458
 459 impl Encode for msgs::OpenChannel {
 460         const TYPE: u16 = 32;
 461 }
 462
 463 impl Encode for msgs::AcceptChannel {
 464         const TYPE: u16 = 33;
 465 }
 466
 467 impl Encode for msgs::FundingCreated {
 468         const TYPE: u16 = 34;
 469 }
 470
 471 impl Encode for msgs::FundingSigned {
 472         const TYPE: u16 = 35;
 473 }
 474
 475 impl Encode for msgs::ChannelReady {
 476         const TYPE: u16 = 36;
 477 }
 478
 479 impl Encode for msgs::Shutdown {
 480         const TYPE: u16 = 38;
 481 }
 482
 483 impl Encode for msgs::ClosingSigned {
 484         const TYPE: u16 = 39;
 485 }
 486
 487 impl Encode for msgs::OpenChannelV2 {
 488         const TYPE: u16 = 64;
 489 }
 490
 491 impl Encode for msgs::AcceptChannelV2 {
 492         const TYPE: u16 = 65;
 493 }
 494
 495 impl Encode for msgs::Splice {
 496         // TODO(splicing) Double check with finalized spec; draft spec contains 74, which is probably wrong as it is used by tx_Abort; CLN uses 75
 497         const TYPE: u16 = 75;
 498 }
 499
 500 impl Encode for msgs::SpliceAck {
 501         const TYPE: u16 = 76;
 502 }
 503
 504 impl Encode for msgs::SpliceLocked {
 505         const TYPE: u16 = 77;
 506 }
 507
 508 impl Encode for msgs::TxAddInput {
 509         const TYPE: u16 = 66;
 510 }
 511
 512 impl Encode for msgs::TxAddOutput {
 513         const TYPE: u16 = 67;
 514 }
 515
 516 impl Encode for msgs::TxRemoveInput {
 517         const TYPE: u16 = 68;
 518 }
 519
 520 impl Encode for msgs::TxRemoveOutput {
 521         const TYPE: u16 = 69;
 522 }
 523
 524 impl Encode for msgs::TxComplete {
 525         const TYPE: u16 = 70;
 526 }
 527
 528 impl Encode for msgs::TxSignatures {
 529         const TYPE: u16 = 71;
 530 }
 531
 532 impl Encode for msgs::TxInitRbf {
 533         const TYPE: u16 = 72;
 534 }
 535
 536 impl Encode for msgs::TxAckRbf {
 537         const TYPE: u16 = 73;
 538 }
 539
 540 impl Encode for msgs::TxAbort {
 541         const TYPE: u16 = 74;
 542 }
 543
 544 impl Encode for msgs::OnionMessage {
 545         const TYPE: u16 = 513;
 546 }
 547
 548 impl Encode for msgs::UpdateAddHTLC {
 549         const TYPE: u16 = 128;
 550 }
 551
 552 impl Encode for msgs::UpdateFulfillHTLC {
 553         const TYPE: u16 = 130;
 554 }
 555
 556 impl Encode for msgs::UpdateFailHTLC {
 557         const TYPE: u16 = 131;
 558 }
 559
 560 impl Encode for msgs::UpdateFailMalformedHTLC {
 561         const TYPE: u16 = 135;
 562 }
 563
 564 impl Encode for msgs::CommitmentSigned {
 565         const TYPE: u16 = 132;
 566 }
 567
 568 impl Encode for msgs::RevokeAndACK {
 569         const TYPE: u16 = 133;
 570 }
 571
 572 impl Encode for msgs::UpdateFee {
 573         const TYPE: u16 = 134;
 574 }
 575
 576 impl Encode for msgs::ChannelReestablish {
 577         const TYPE: u16 = 136;
 578 }
 579
 580 impl Encode for msgs::AnnouncementSignatures {
 581         const TYPE: u16 = 259;
 582 }
 583
 584 impl Encode for msgs::ChannelAnnouncement {
 585         const TYPE: u16 = 256;
 586 }
 587
 588 impl Encode for msgs::NodeAnnouncement {
 589         const TYPE: u16 = 257;
 590 }
 591
 592 impl Encode for msgs::ChannelUpdate {
 593         const TYPE: u16 = 258;
 594 }
 595
 596 impl Encode for msgs::QueryShortChannelIds {
 597         const TYPE: u16 = 261;
 598 }
 599
 600 impl Encode for msgs::ReplyShortChannelIdsEnd {
 601         const TYPE: u16 = 262;
 602 }
 603
 604 impl Encode for msgs::QueryChannelRange {
 605         const TYPE: u16 = 263;
 606 }
 607
 608 impl Encode for msgs::ReplyChannelRange {
 609         const TYPE: u16 = 264;
 610 }
 611
 612 impl Encode for msgs::GossipTimestampFilter {
 613         const TYPE: u16 = 265;
 614 }
 615
 616 #[cfg(test)]
 617 mod tests {
 618         use super::*;
 619         use crate::prelude::*;
 620         use core::convert::TryInto;
 621         use crate::ln::peer_handler::IgnoringMessageHandler;
 622
 623         // Big-endian wire encoding of Pong message (type = 19, byteslen = 2).
 624         const ENCODED_PONG: [u8; 6] = [0u8, 19u8, 0u8, 2u8, 0u8, 0u8];
 625
 626         #[test]
 627         fn read_empty_buffer() {
 628                 let buffer = [];
 629                 let mut reader = io::Cursor::new(buffer);
 630                 assert!(read(&mut reader, &IgnoringMessageHandler{}).is_err());
 631         }
 632
 633         #[test]
 634         fn read_incomplete_type() {
 635                 let buffer = &ENCODED_PONG[..1];
 636                 let mut reader = io::Cursor::new(buffer);
 637                 assert!(read(&mut reader, &IgnoringMessageHandler{}).is_err());
 638         }
 639
 640         #[test]
 641         fn read_empty_payload() {
 642                 let buffer = &ENCODED_PONG[..2];
 643                 let mut reader = io::Cursor::new(buffer);
 644                 assert!(read(&mut reader, &IgnoringMessageHandler{}).is_err());
 645         }
 646
 647         #[test]
 648         fn read_invalid_message() {
 649                 let buffer = &ENCODED_PONG[..4];
 650                 let mut reader = io::Cursor::new(buffer);
 651                 assert!(read(&mut reader, &IgnoringMessageHandler{}).is_err());
 652         }
 653
 654         #[test]
 655         fn read_known_message() {
 656                 let buffer = &ENCODED_PONG[..];
 657                 let mut reader = io::Cursor::new(buffer);
 658                 let message = read(&mut reader, &IgnoringMessageHandler{}).unwrap();
 659                 match message {
 660                         Message::Pong(_) => (),
 661                         _ => panic!("Expected pong message; found message type: {}", message.type_id()),
 662                 }
 663         }
 664
 665         #[test]
 666         fn read_unknown_message() {
 667                 let buffer = &::core::u16::MAX.to_be_bytes();
 668                 let mut reader = io::Cursor::new(buffer);
 669                 let message = read(&mut reader, &IgnoringMessageHandler{}).unwrap();
 670                 match message {
 671                         Message::Unknown(::core::u16::MAX) => (),
 672                         _ => panic!("Expected message type {}; found: {}", ::core::u16::MAX, message.type_id()),
 673                 }
 674         }
 675
 676         #[test]
 677         fn write_message_with_type() {
 678                 let message = msgs::Pong { byteslen: 2u16 };
 679                 let mut buffer = Vec::new();
 680                 assert!(write(&message, &mut buffer).is_ok());
 681
 682                 let type_length = ::core::mem::size_of::<u16>();
 683                 let (type_bytes, payload_bytes) = buffer.split_at(type_length);
 684                 assert_eq!(u16::from_be_bytes(type_bytes.try_into().unwrap()), msgs::Pong::TYPE);
 685                 assert_eq!(payload_bytes, &ENCODED_PONG[type_length..]);
 686         }
 687
 688         #[test]
 689         fn read_message_encoded_with_write() {
 690                 let message = msgs::Pong { byteslen: 2u16 };
 691                 let mut buffer = Vec::new();
 692                 assert!(write(&message, &mut buffer).is_ok());
 693
 694                 let mut reader = io::Cursor::new(buffer);
 695                 let decoded_message = read(&mut reader, &IgnoringMessageHandler{}).unwrap();
 696                 match decoded_message {
 697                         Message::Pong(msgs::Pong { byteslen: 2u16 }) => (),
 698                         Message::Pong(msgs::Pong { byteslen }) => {
 699                                 panic!("Expected byteslen {}; found: {}", message.byteslen, byteslen);
 700                         },
 701                         _ => panic!("Expected pong message; found message type: {}", decoded_message.type_id()),
 702                 }
 703         }
 704
 705         #[test]
 706         fn is_even_message_type() {
 707                 let message = Message::<()>::Unknown(42);
 708                 assert!(message.is_even());
 709         }
 710
 711         #[test]
 712         fn is_odd_message_type() {
 713                 let message = Message::<()>::Unknown(43);
 714                 assert!(!message.is_even());
 715         }
 716
 717         #[test]
 718         fn read_lnd_init_msg() {
 719                 // Taken from lnd v0.9.0-beta.
 720                 let buffer = vec![0, 16, 0, 2, 34, 0, 0, 3, 2, 162, 161];
 721                 check_init_msg(buffer, false);
 722         }
 723
 724         #[test]
 725         fn read_clightning_init_msg() {
 726                 // Taken from c-lightning v0.8.0.
 727                 let buffer = vec![0, 16, 0, 2, 34, 0, 0, 3, 2, 170, 162, 1, 32, 6, 34, 110, 70, 17, 26, 11, 89, 202, 175, 18, 96, 67, 235, 91, 191, 40, 195, 79, 58, 94, 51, 42, 31, 199, 178, 183, 60, 241, 136, 145, 15];
 728                 check_init_msg(buffer, true);
 729         }
 730
 731         fn check_init_msg(buffer: Vec<u8>, expect_unknown: bool) {
 732                 let mut reader = io::Cursor::new(buffer);
 733                 let decoded_msg = read(&mut reader, &IgnoringMessageHandler{}).unwrap();
 734                 match decoded_msg {
 735                         Message::Init(msgs::Init { features, .. }) => {
 736                                 assert!(features.supports_variable_length_onion());
 737                                 assert!(features.supports_upfront_shutdown_script());
 738                                 assert!(features.supports_gossip_queries());
 739                                 assert_eq!(expect_unknown, features.supports_unknown_bits());
 740                                 assert!(!features.requires_unknown_bits());
 741                                 assert!(!features.initial_routing_sync());
 742                         },
 743                         _ => panic!("Expected init message, found message type: {}", decoded_msg.type_id())
 744                 }
 745         }
 746
 747         #[test]
 748         fn read_lnd_node_announcement() {
 749                 // Taken from lnd v0.9.0-beta.
 750                 let buffer = vec![1, 1, 91, 164, 146, 213, 213, 165, 21, 227, 102, 33, 105, 179, 214, 21, 221, 175, 228, 93, 57, 177, 191, 127, 107, 229, 31, 50, 21, 81, 179, 71, 39, 18, 35, 2, 89, 224, 110, 123, 66, 39, 148, 246, 177, 85, 12, 19, 70, 226, 173, 132, 156, 26, 122, 146, 71, 213, 247, 48, 93, 190, 185, 177, 12, 172, 0, 3, 2, 162, 161, 94, 103, 195, 37, 2, 37, 242, 97, 140, 2, 111, 69, 85, 39, 118, 30, 221, 99, 254, 120, 49, 103, 22, 170, 227, 111, 172, 164, 160, 49, 68, 138, 116, 16, 22, 206, 107, 51, 153, 255, 97, 108, 105, 99, 101, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 1, 172, 21, 0, 2, 38, 7];
 751                 let mut reader = io::Cursor::new(buffer);
 752                 let decoded_msg = read(&mut reader, &IgnoringMessageHandler{}).unwrap();
 753                 match decoded_msg {
 754                         Message::NodeAnnouncement(msgs::NodeAnnouncement { contents: msgs::UnsignedNodeAnnouncement { features, ..}, ..}) => {
 755                                 assert!(features.supports_variable_length_onion());
 756                                 assert!(features.supports_upfront_shutdown_script());
 757                                 assert!(features.supports_gossip_queries());
 758                                 assert!(!features.requires_unknown_bits());
 759                         },
 760                         _ => panic!("Expected node announcement, found message type: {}", decoded_msg.type_id())
 761                 }
 762         }
 763
 764         #[test]
 765         fn read_lnd_chan_announcement() {
 766                 // Taken from lnd v0.9.0-beta.
 767                 let buffer = vec![1, 0, 82, 238, 153, 33, 128, 87, 215, 2, 28, 241, 140, 250, 98, 255, 56, 5, 79, 240, 214, 231, 172, 35, 240, 171, 44, 9, 78, 91, 8, 193, 102, 5, 17, 178, 142, 106, 180, 183, 46, 38, 217, 212, 25, 236, 69, 47, 92, 217, 181, 221, 161, 205, 121, 201, 99, 38, 158, 216, 186, 193, 230, 86, 222, 6, 206, 67, 22, 255, 137, 212, 141, 161, 62, 134, 76, 48, 241, 54, 50, 167, 187, 247, 73, 27, 74, 1, 129, 185, 197, 153, 38, 90, 255, 138, 39, 161, 102, 172, 213, 74, 107, 88, 150, 90, 0, 49, 104, 7, 182, 184, 194, 219, 181, 172, 8, 245, 65, 226, 19, 228, 101, 145, 25, 159, 52, 31, 58, 93, 53, 59, 218, 91, 37, 84, 103, 17, 74, 133, 33, 35, 2, 203, 101, 73, 19, 94, 175, 122, 46, 224, 47, 168, 128, 128, 25, 26, 25, 214, 52, 247, 43, 241, 117, 52, 206, 94, 135, 156, 52, 164, 143, 234, 58, 185, 50, 185, 140, 198, 174, 71, 65, 18, 105, 70, 131, 172, 137, 0, 164, 51, 215, 143, 117, 119, 217, 241, 197, 177, 227, 227, 170, 199, 114, 7, 218, 12, 107, 30, 191, 236, 203, 21, 61, 242, 48, 192, 90, 233, 200, 199, 111, 162, 68, 234, 54, 219, 1, 233, 66, 5, 82, 74, 84, 211, 95, 199, 245, 202, 89, 223, 102, 124, 62, 166, 253, 253, 90, 180, 118, 21, 61, 110, 37, 5, 96, 167, 0, 0, 6, 34, 110, 70, 17, 26, 11, 89, 202, 175, 18, 96, 67, 235, 91, 191, 40, 195, 79, 58, 94, 51, 42, 31, 199, 178, 183, 60, 241, 136, 145, 15, 0, 2, 65, 0, 0, 1, 0, 0, 2, 37, 242, 97, 140, 2, 111, 69, 85, 39, 118, 30, 221, 99, 254, 120, 49, 103, 22, 170, 227, 111, 172, 164, 160, 49, 68, 138, 116, 16, 22, 206, 107, 3, 54, 61, 144, 88, 171, 247, 136, 208, 99, 9, 135, 37, 201, 178, 253, 136, 0, 185, 235, 68, 160, 106, 110, 12, 46, 21, 125, 204, 18, 75, 234, 16, 3, 42, 171, 28, 52, 224, 11, 30, 30, 253, 156, 148, 175, 203, 121, 250, 111, 122, 195, 84, 122, 77, 183, 56, 135, 101, 88, 41, 60, 191, 99, 232, 85, 2, 36, 17, 156, 11, 8, 12, 189, 177, 68, 88, 28, 15, 207, 21, 179, 151, 56, 226, 158, 148, 3, 120, 113, 177, 243, 184, 17, 173, 37, 46, 222, 16];
 768                 let mut reader = io::Cursor::new(buffer);
 769                 let decoded_msg = read(&mut reader, &IgnoringMessageHandler{}).unwrap();
 770                 match decoded_msg {
 771                         Message::ChannelAnnouncement(msgs::ChannelAnnouncement { contents: msgs::UnsignedChannelAnnouncement { features, ..}, ..}) => {
 772                                 assert!(!features.requires_unknown_bits());
 773                         },
 774                         _ => panic!("Expected node announcement, found message type: {}", decoded_msg.type_id())
 775                 }
 776         }
 777
 778         #[derive(Eq, PartialEq, Debug)]
 779         struct TestCustomMessage {}
 780
 781         const CUSTOM_MESSAGE_TYPE : u16 = 9000;
 782
 783         impl Type for TestCustomMessage {
 784                 fn type_id(&self) -> u16 {
 785                         CUSTOM_MESSAGE_TYPE
 786                 }
 787         }
 788
 789         impl Writeable for TestCustomMessage {
 790                 fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
 791                         Ok(())
 792                 }
 793         }
 794
 795         struct TestCustomMessageReader {}
 796
 797         impl CustomMessageReader for TestCustomMessageReader {
 798                 type CustomMessage = TestCustomMessage;
 799                 fn read<R: io::Read>(
 800                         &self,
 801                         message_type: u16,
 802                         _: &mut R
 803                 ) -> Result<Option<Self::CustomMessage>, msgs::DecodeError> {
 804                         if message_type == CUSTOM_MESSAGE_TYPE {
 805                                 return Ok(Some(TestCustomMessage{}));
 806                         }
 807
 808                         Ok(None)
 809                 }
 810         }
 811
 812         #[test]
 813         fn read_custom_message() {
 814                 let buffer = vec![35, 40];
 815                 let mut reader = io::Cursor::new(buffer);
 816                 let decoded_msg = read(&mut reader, &TestCustomMessageReader{}).unwrap();
 817                 match decoded_msg {
 818                         Message::Custom(custom) => {
 819                                 assert_eq!(custom.type_id(), CUSTOM_MESSAGE_TYPE);
 820                                 assert_eq!(custom, TestCustomMessage {});
 821                         },
 822                         _ => panic!("Expected custom message, found message type: {}", decoded_msg.type_id()),
 823                 }
 824         }
 825
 826         #[test]
 827         fn read_with_custom_reader_unknown_message_type() {
 828                 let buffer = vec![35, 42];
 829                 let mut reader = io::Cursor::new(buffer);
 830                 let decoded_msg = read(&mut reader, &TestCustomMessageReader{}).unwrap();
 831                 match decoded_msg {
 832                         Message::Unknown(_) => {},
 833                         _ => panic!("Expected unknown message, found message type: {}", decoded_msg.type_id()),
 834                 }
 835         }
 836
 837         #[test]
 838         fn custom_reader_unknown_message_type() {
 839                 let buffer = Vec::new();
 840                 let mut reader = io::Cursor::new(buffer);
 841                 let res = TestCustomMessageReader{}.read(CUSTOM_MESSAGE_TYPE + 1, &mut reader).unwrap();
 842                 assert!(res.is_none());
 843         }
 844 }