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