_ Git - rust-lightning/blob - src/ln/msgs.rs

   1 //! Wire messages, traits representing wire message handlers, and a few error types live here.
   2 //!
   3 //! For a normal node you probably don't need to use anything here, however, if you wish to split a
   4 //! node into an internet-facing route/message socket handling daemon and a separate daemon (or
   5 //! server entirely) which handles only channel-related messages you may wish to implement
   6 //! ChannelMessageHandler yourself and use it to re-serialize messages and pass them across
   7 //! daemons/servers.
   8 //!
   9 //! Note that if you go with such an architecture (instead of passing raw socket events to a
  10 //! non-internet-facing system) you trust the frontend internet-facing system to not lie about the
  11 //! source node_id of the mssage, however this does allow you to significantly reduce bandwidth
  12 //! between the systems as routing messages can represent a significant chunk of bandwidth usage
  13 //! (especially for non-channel-publicly-announcing nodes). As an alternate design which avoids
  14 //! this issue, if you have sufficient bidirectional bandwidth between your systems, you may send
  15 //! raw socket events into your non-internet-facing system and then send routing events back to
  16 //! track the network on the less-secure system.
  17
  18 use secp256k1::key::PublicKey;
  19 use secp256k1::{Secp256k1, Signature};
  20 use secp256k1;
  21 use bitcoin::util::hash::Sha256dHash;
  22 use bitcoin::blockdata::script::Script;
  23
  24 use std::error::Error;
  25 use std::{cmp, fmt};
  26 use std::io::Read;
  27 use std::result::Result;
  28
  29 use util::{byte_utils, events};
  30 use util::ser::{Readable, Writeable, Writer};
  31
  32 /// An error in decoding a message or struct.
  33 #[derive(Debug)]
  34 pub enum DecodeError {
  35         /// A version byte specified something we don't know how to handle.
  36         /// Includes unknown realm byte in an OnionHopData packet
  37         UnknownVersion,
  38         /// Unknown feature mandating we fail to parse message
  39         UnknownRequiredFeature,
  40         /// Value was invalid, eg a byte which was supposed to be a bool was something other than a 0
  41         /// or 1, a public key/private key/signature was invalid, text wasn't UTF-8, etc
  42         InvalidValue,
  43         /// Buffer too short
  44         ShortRead,
  45         /// node_announcement included more than one address of a given type!
  46         ExtraAddressesPerType,
  47         /// A length descriptor in the packet didn't describe the later data correctly
  48         /// (currently only generated in node_announcement)
  49         BadLengthDescriptor,
  50         /// Error from std::io
  51         Io(::std::io::Error),
  52 }
  53
  54 /// Tracks localfeatures which are only in init messages
  55 #[derive(Clone, PartialEq)]
  56 pub struct LocalFeatures {
  57         flags: Vec<u8>,
  58 }
  59
  60 impl LocalFeatures {
  61         pub(crate) fn new() -> LocalFeatures {
  62                 LocalFeatures {
  63                         flags: Vec::new(),
  64                 }
  65         }
  66
  67         pub(crate) fn supports_data_loss_protect(&self) -> bool {
  68                 self.flags.len() > 0 && (self.flags[0] & 3) != 0
  69         }
  70         pub(crate) fn requires_data_loss_protect(&self) -> bool {
  71                 self.flags.len() > 0 && (self.flags[0] & 1) != 0
  72         }
  73
  74         pub(crate) fn initial_routing_sync(&self) -> bool {
  75                 self.flags.len() > 0 && (self.flags[0] & (1 << 3)) != 0
  76         }
  77         pub(crate) fn set_initial_routing_sync(&mut self) {
  78                 if self.flags.len() == 0 {
  79                         self.flags.resize(1, 1 << 3);
  80                 } else {
  81                         self.flags[0] |= 1 << 3;
  82                 }
  83         }
  84
  85         pub(crate) fn supports_upfront_shutdown_script(&self) -> bool {
  86                 self.flags.len() > 0 && (self.flags[0] & (3 << 4)) != 0
  87         }
  88         pub(crate) fn requires_upfront_shutdown_script(&self) -> bool {
  89                 self.flags.len() > 0 && (self.flags[0] & (1 << 4)) != 0
  90         }
  91
  92         pub(crate) fn requires_unknown_bits(&self) -> bool {
  93                 for (idx, &byte) in self.flags.iter().enumerate() {
  94                         if idx != 0 && (byte & 0x55) != 0 {
  95                                 return true;
  96                         } else if idx == 0 && (byte & 0x14) != 0 {
  97                                 return true;
  98                         }
  99                 }
 100                 return false;
 101         }
 102
 103         pub(crate) fn supports_unknown_bits(&self) -> bool {
 104                 for (idx, &byte) in self.flags.iter().enumerate() {
 105                         if idx != 0 && byte != 0 {
 106                                 return true;
 107                         } else if idx == 0 && (byte & 0xc4) != 0 {
 108                                 return true;
 109                         }
 110                 }
 111                 return false;
 112         }
 113 }
 114
 115 /// Tracks globalfeatures which are in init messages and routing announcements
 116 #[derive(Clone, PartialEq)]
 117 pub struct GlobalFeatures {
 118         flags: Vec<u8>,
 119 }
 120
 121 impl GlobalFeatures {
 122         pub(crate) fn new() -> GlobalFeatures {
 123                 GlobalFeatures {
 124                         flags: Vec::new(),
 125                 }
 126         }
 127
 128         pub(crate) fn requires_unknown_bits(&self) -> bool {
 129                 for &byte in self.flags.iter() {
 130                         if (byte & 0x55) != 0 {
 131                                 return true;
 132                         }
 133                 }
 134                 return false;
 135         }
 136
 137         pub(crate) fn supports_unknown_bits(&self) -> bool {
 138                 for &byte in self.flags.iter() {
 139                         if byte != 0 {
 140                                 return true;
 141                         }
 142                 }
 143                 return false;
 144         }
 145 }
 146
 147 /// An init message to be sent or received from a peer
 148 pub struct Init {
 149         pub(crate) global_features: GlobalFeatures,
 150         pub(crate) local_features: LocalFeatures,
 151 }
 152
 153 /// An error message to be sent or received from a peer
 154 pub struct ErrorMessage {
 155         pub(crate) channel_id: [u8; 32],
 156         pub(crate) data: String,
 157 }
 158
 159 /// A ping message to be sent or received from a peer
 160 pub struct Ping {
 161         pub(crate) ponglen: u16,
 162         pub(crate) byteslen: u16,
 163 }
 164
 165 /// A pong message to be sent or received from a peer
 166 pub struct Pong {
 167         pub(crate) byteslen: u16,
 168 }
 169
 170 /// An open_channel message to be sent or received from a peer
 171 #[derive(Clone)]
 172 pub struct OpenChannel {
 173         pub(crate) chain_hash: Sha256dHash,
 174         pub(crate) temporary_channel_id: [u8; 32],
 175         pub(crate) funding_satoshis: u64,
 176         pub(crate) push_msat: u64,
 177         pub(crate) dust_limit_satoshis: u64,
 178         pub(crate) max_htlc_value_in_flight_msat: u64,
 179         pub(crate) channel_reserve_satoshis: u64,
 180         pub(crate) htlc_minimum_msat: u64,
 181         pub(crate) feerate_per_kw: u32,
 182         pub(crate) to_self_delay: u16,
 183         pub(crate) max_accepted_htlcs: u16,
 184         pub(crate) funding_pubkey: PublicKey,
 185         pub(crate) revocation_basepoint: PublicKey,
 186         pub(crate) payment_basepoint: PublicKey,
 187         pub(crate) delayed_payment_basepoint: PublicKey,
 188         pub(crate) htlc_basepoint: PublicKey,
 189         pub(crate) first_per_commitment_point: PublicKey,
 190         pub(crate) channel_flags: u8,
 191         pub(crate) shutdown_scriptpubkey: Option<Script>,
 192 }
 193
 194 /// An accept_channel message to be sent or received from a peer
 195 #[derive(Clone)]
 196 pub struct AcceptChannel {
 197         pub(crate) temporary_channel_id: [u8; 32],
 198         pub(crate) dust_limit_satoshis: u64,
 199         pub(crate) max_htlc_value_in_flight_msat: u64,
 200         pub(crate) channel_reserve_satoshis: u64,
 201         pub(crate) htlc_minimum_msat: u64,
 202         pub(crate) minimum_depth: u32,
 203         pub(crate) to_self_delay: u16,
 204         pub(crate) max_accepted_htlcs: u16,
 205         pub(crate) funding_pubkey: PublicKey,
 206         pub(crate) revocation_basepoint: PublicKey,
 207         pub(crate) payment_basepoint: PublicKey,
 208         pub(crate) delayed_payment_basepoint: PublicKey,
 209         pub(crate) htlc_basepoint: PublicKey,
 210         pub(crate) first_per_commitment_point: PublicKey,
 211         pub(crate) shutdown_scriptpubkey: Option<Script>,
 212 }
 213
 214 /// A funding_created message to be sent or received from a peer
 215 #[derive(Clone)]
 216 pub struct FundingCreated {
 217         pub(crate) temporary_channel_id: [u8; 32],
 218         pub(crate) funding_txid: Sha256dHash,
 219         pub(crate) funding_output_index: u16,
 220         pub(crate) signature: Signature,
 221 }
 222
 223 /// A funding_signed message to be sent or received from a peer
 224 #[derive(Clone)]
 225 pub struct FundingSigned {
 226         pub(crate) channel_id: [u8; 32],
 227         pub(crate) signature: Signature,
 228 }
 229
 230 /// A funding_locked message to be sent or received from a peer
 231 #[derive(Clone, PartialEq)]
 232 pub struct FundingLocked {
 233         pub(crate) channel_id: [u8; 32],
 234         pub(crate) next_per_commitment_point: PublicKey,
 235 }
 236
 237 /// A shutdown message to be sent or received from a peer
 238 #[derive(Clone)]
 239 pub struct Shutdown {
 240         pub(crate) channel_id: [u8; 32],
 241         pub(crate) scriptpubkey: Script,
 242 }
 243
 244 /// A closing_signed message to be sent or received from a peer
 245 #[derive(Clone)]
 246 pub struct ClosingSigned {
 247         pub(crate) channel_id: [u8; 32],
 248         pub(crate) fee_satoshis: u64,
 249         pub(crate) signature: Signature,
 250 }
 251
 252 /// An update_add_htlc message to be sent or received from a peer
 253 #[derive(Clone, PartialEq)]
 254 pub struct UpdateAddHTLC {
 255         pub(crate) channel_id: [u8; 32],
 256         pub(crate) htlc_id: u64,
 257         pub(crate) amount_msat: u64,
 258         pub(crate) payment_hash: [u8; 32],
 259         pub(crate) cltv_expiry: u32,
 260         pub(crate) onion_routing_packet: OnionPacket,
 261 }
 262
 263 /// An update_fulfill_htlc message to be sent or received from a peer
 264 #[derive(Clone, PartialEq)]
 265 pub struct UpdateFulfillHTLC {
 266         pub(crate) channel_id: [u8; 32],
 267         pub(crate) htlc_id: u64,
 268         pub(crate) payment_preimage: [u8; 32],
 269 }
 270
 271 /// An update_fail_htlc message to be sent or received from a peer
 272 #[derive(Clone, PartialEq)]
 273 pub struct UpdateFailHTLC {
 274         pub(crate) channel_id: [u8; 32],
 275         pub(crate) htlc_id: u64,
 276         pub(crate) reason: OnionErrorPacket,
 277 }
 278
 279 /// An update_fail_malformed_htlc message to be sent or received from a peer
 280 #[derive(Clone, PartialEq)]
 281 pub struct UpdateFailMalformedHTLC {
 282         pub(crate) channel_id: [u8; 32],
 283         pub(crate) htlc_id: u64,
 284         pub(crate) sha256_of_onion: [u8; 32],
 285         pub(crate) failure_code: u16,
 286 }
 287
 288 /// A commitment_signed message to be sent or received from a peer
 289 #[derive(Clone, PartialEq)]
 290 pub struct CommitmentSigned {
 291         pub(crate) channel_id: [u8; 32],
 292         pub(crate) signature: Signature,
 293         pub(crate) htlc_signatures: Vec<Signature>,
 294 }
 295
 296 /// A revoke_and_ack message to be sent or received from a peer
 297 #[derive(Clone, PartialEq)]
 298 pub struct RevokeAndACK {
 299         pub(crate) channel_id: [u8; 32],
 300         pub(crate) per_commitment_secret: [u8; 32],
 301         pub(crate) next_per_commitment_point: PublicKey,
 302 }
 303
 304 /// An update_fee message to be sent or received from a peer
 305 #[derive(PartialEq)]
 306 pub struct UpdateFee {
 307         pub(crate) channel_id: [u8; 32],
 308         pub(crate) feerate_per_kw: u32,
 309 }
 310
 311 #[derive(PartialEq)]
 312 pub(crate) struct DataLossProtect {
 313         pub(crate) your_last_per_commitment_secret: [u8; 32],
 314         pub(crate) my_current_per_commitment_point: PublicKey,
 315 }
 316
 317 /// A channel_reestablish message to be sent or received from a peer
 318 #[derive(PartialEq)]
 319 pub struct ChannelReestablish {
 320         pub(crate) channel_id: [u8; 32],
 321         pub(crate) next_local_commitment_number: u64,
 322         pub(crate) next_remote_commitment_number: u64,
 323         pub(crate) data_loss_protect: Option<DataLossProtect>,
 324 }
 325
 326 /// An announcement_signatures message to be sent or received from a peer
 327 #[derive(Clone)]
 328 pub struct AnnouncementSignatures {
 329         pub(crate) channel_id: [u8; 32],
 330         pub(crate) short_channel_id: u64,
 331         pub(crate) node_signature: Signature,
 332         pub(crate) bitcoin_signature: Signature,
 333 }
 334
 335 /// An address which can be used to connect to a remote peer
 336 #[derive(Clone)]
 337 pub enum NetAddress {
 338         /// An IPv4 address/port on which the peer is listenting.
 339         IPv4 {
 340                 /// The 4-byte IPv4 address
 341                 addr: [u8; 4],
 342                 /// The port on which the node is listenting
 343                 port: u16,
 344         },
 345         /// An IPv6 address/port on which the peer is listenting.
 346         IPv6 {
 347                 /// The 16-byte IPv6 address
 348                 addr: [u8; 16],
 349                 /// The port on which the node is listenting
 350                 port: u16,
 351         },
 352         /// An old-style Tor onion address/port on which the peer is listening.
 353         OnionV2 {
 354                 /// The bytes (usually encoded in base32 with ".onion" appended)
 355                 addr: [u8; 10],
 356                 /// The port on which the node is listenting
 357                 port: u16,
 358         },
 359         /// A new-style Tor onion address/port on which the peer is listening.
 360         /// To create the human-readable "hostname", concatenate ed25519_pubkey, checksum, and version,
 361         /// wrap as base32 and append ".onion".
 362         OnionV3 {
 363                 /// The ed25519 long-term public key of the peer
 364                 ed25519_pubkey: [u8; 32],
 365                 /// The checksum of the pubkey and version, as included in the onion address
 366                 checksum: u16,
 367                 /// The version byte, as defined by the Tor Onion v3 spec.
 368                 version: u8,
 369                 /// The port on which the node is listenting
 370                 port: u16,
 371         },
 372 }
 373 impl NetAddress {
 374         fn get_id(&self) -> u8 {
 375                 match self {
 376                         &NetAddress::IPv4 {..} => { 1 },
 377                         &NetAddress::IPv6 {..} => { 2 },
 378                         &NetAddress::OnionV2 {..} => { 3 },
 379                         &NetAddress::OnionV3 {..} => { 4 },
 380                 }
 381         }
 382 }
 383
 384 // Only exposed as broadcast of node_announcement should be filtered by node_id
 385 /// The unsigned part of a node_announcement
 386 pub struct UnsignedNodeAnnouncement {
 387         pub(crate) features: GlobalFeatures,
 388         pub(crate) timestamp: u32,
 389         /// The node_id this announcement originated from (don't rebroadcast the node_announcement back
 390         /// to this node).
 391         pub        node_id: PublicKey,
 392         pub(crate) rgb: [u8; 3],
 393         pub(crate) alias: [u8; 32],
 394         /// List of addresses on which this node is reachable. Note that you may only have up to one
 395         /// address of each type, if you have more, they may be silently discarded or we may panic!
 396         pub(crate) addresses: Vec<NetAddress>,
 397         pub(crate) excess_address_data: Vec<u8>,
 398         pub(crate) excess_data: Vec<u8>,
 399 }
 400 /// A node_announcement message to be sent or received from a peer
 401 pub struct NodeAnnouncement {
 402         pub(crate) signature: Signature,
 403         pub(crate) contents: UnsignedNodeAnnouncement,
 404 }
 405
 406 // Only exposed as broadcast of channel_announcement should be filtered by node_id
 407 /// The unsigned part of a channel_announcement
 408 #[derive(PartialEq, Clone)]
 409 pub struct UnsignedChannelAnnouncement {
 410         pub(crate) features: GlobalFeatures,
 411         pub(crate) chain_hash: Sha256dHash,
 412         pub(crate) short_channel_id: u64,
 413         /// One of the two node_ids which are endpoints of this channel
 414         pub        node_id_1: PublicKey,
 415         /// The other of the two node_ids which are endpoints of this channel
 416         pub        node_id_2: PublicKey,
 417         pub(crate) bitcoin_key_1: PublicKey,
 418         pub(crate) bitcoin_key_2: PublicKey,
 419         pub(crate) excess_data: Vec<u8>,
 420 }
 421 /// A channel_announcement message to be sent or received from a peer
 422 #[derive(PartialEq, Clone)]
 423 pub struct ChannelAnnouncement {
 424         pub(crate) node_signature_1: Signature,
 425         pub(crate) node_signature_2: Signature,
 426         pub(crate) bitcoin_signature_1: Signature,
 427         pub(crate) bitcoin_signature_2: Signature,
 428         pub(crate) contents: UnsignedChannelAnnouncement,
 429 }
 430
 431 #[derive(PartialEq, Clone)]
 432 pub(crate) struct UnsignedChannelUpdate {
 433         pub(crate) chain_hash: Sha256dHash,
 434         pub(crate) short_channel_id: u64,
 435         pub(crate) timestamp: u32,
 436         pub(crate) flags: u16,
 437         pub(crate) cltv_expiry_delta: u16,
 438         pub(crate) htlc_minimum_msat: u64,
 439         pub(crate) fee_base_msat: u32,
 440         pub(crate) fee_proportional_millionths: u32,
 441         pub(crate) excess_data: Vec<u8>,
 442 }
 443 /// A channel_update message to be sent or received from a peer
 444 #[derive(PartialEq, Clone)]
 445 pub struct ChannelUpdate {
 446         pub(crate) signature: Signature,
 447         pub(crate) contents: UnsignedChannelUpdate,
 448 }
 449
 450 /// Used to put an error message in a HandleError
 451 pub enum ErrorAction {
 452         /// The peer took some action which made us think they were useless. Disconnect them.
 453         DisconnectPeer {
 454                 /// An error message which we should make an effort to send before we disconnect.
 455                 msg: Option<ErrorMessage>
 456         },
 457         /// The peer did something harmless that we weren't able to process, just log and ignore
 458         IgnoreError,
 459         /// The peer did something incorrect. Tell them.
 460         SendErrorMessage {
 461                 /// The message to send.
 462                 msg: ErrorMessage
 463         },
 464 }
 465
 466 /// An Err type for failure to process messages.
 467 pub struct HandleError { //TODO: rename me
 468         /// A human-readable message describing the error
 469         pub err: &'static str,
 470         /// The action which should be taken against the offending peer.
 471         pub action: Option<ErrorAction>, //TODO: Make this required
 472 }
 473
 474 /// Struct used to return values from revoke_and_ack messages, containing a bunch of commitment
 475 /// transaction updates if they were pending.
 476 #[derive(PartialEq)]
 477 pub struct CommitmentUpdate {
 478         pub(crate) update_add_htlcs: Vec<UpdateAddHTLC>,
 479         pub(crate) update_fulfill_htlcs: Vec<UpdateFulfillHTLC>,
 480         pub(crate) update_fail_htlcs: Vec<UpdateFailHTLC>,
 481         pub(crate) update_fail_malformed_htlcs: Vec<UpdateFailMalformedHTLC>,
 482         pub(crate) update_fee: Option<UpdateFee>,
 483         pub(crate) commitment_signed: CommitmentSigned,
 484 }
 485
 486 /// The information we received from a peer along the route of a payment we originated. This is
 487 /// returned by ChannelMessageHandler::handle_update_fail_htlc to be passed into
 488 /// RoutingMessageHandler::handle_htlc_fail_channel_update to update our network map.
 489 pub enum HTLCFailChannelUpdate {
 490         /// We received an error which included a full ChannelUpdate message.
 491         ChannelUpdateMessage {
 492                 /// The unwrapped message we received
 493                 msg: ChannelUpdate,
 494         },
 495         /// We received an error which indicated only that a channel has been closed
 496         ChannelClosed {
 497                 /// The short_channel_id which has now closed.
 498                 short_channel_id: u64,
 499                 /// when this true, this channel should be permanently removed from the
 500                 /// consideration. Otherwise, this channel can be restored as new channel_update is received
 501                 is_permanent: bool,
 502         },
 503         /// We received an error which indicated only that a node has failed
 504         NodeFailure {
 505                 /// The node_id that has failed.
 506                 node_id: PublicKey,
 507                 /// when this true, node should be permanently removed from the
 508                 /// consideration. Otherwise, the channels connected to this node can be
 509                 /// restored as new channel_update is received
 510                 is_permanent: bool,
 511         }
 512 }
 513
 514 /// For events which result in both a RevokeAndACK and a CommitmentUpdate, by default they should
 515 /// be sent in the order they appear in the return value, however sometimes the order needs to be
 516 /// variable at runtime (eg handle_channel_reestablish needs to re-send messages in the order they
 517 /// were originally sent). In those cases, this enum is also returned.
 518 #[derive(Clone, PartialEq)]
 519 pub enum RAACommitmentOrder {
 520         /// Send the CommitmentUpdate messages first
 521         CommitmentFirst,
 522         /// Send the RevokeAndACK message first
 523         RevokeAndACKFirst,
 524 }
 525
 526 /// A trait to describe an object which can receive channel messages.
 527 ///
 528 /// Messages MAY be called in parallel when they originate from different their_node_ids, however
 529 /// they MUST NOT be called in parallel when the two calls have the same their_node_id.
 530 pub trait ChannelMessageHandler : events::MessageSendEventsProvider + Send + Sync {
 531         //Channel init:
 532         /// Handle an incoming open_channel message from the given peer.
 533         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result<(), HandleError>;
 534         /// Handle an incoming accept_channel message from the given peer.
 535         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &AcceptChannel) -> Result<(), HandleError>;
 536         /// Handle an incoming funding_created message from the given peer.
 537         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated) -> Result<(), HandleError>;
 538         /// Handle an incoming funding_signed message from the given peer.
 539         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned) -> Result<(), HandleError>;
 540         /// Handle an incoming funding_locked message from the given peer.
 541         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked) -> Result<(), HandleError>;
 542
 543         // Channl close:
 544         /// Handle an incoming shutdown message from the given peer.
 545         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &Shutdown) -> Result<(), HandleError>;
 546         /// Handle an incoming closing_signed message from the given peer.
 547         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &ClosingSigned) -> Result<(), HandleError>;
 548
 549         // HTLC handling:
 550         /// Handle an incoming update_add_htlc message from the given peer.
 551         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &UpdateAddHTLC) -> Result<(), HandleError>;
 552         /// Handle an incoming update_fulfill_htlc message from the given peer.
 553         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFulfillHTLC) -> Result<(), HandleError>;
 554         /// Handle an incoming update_fail_htlc message from the given peer.
 555         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailHTLC) -> Result<(), HandleError>;
 556         /// Handle an incoming update_fail_malformed_htlc message from the given peer.
 557         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailMalformedHTLC) -> Result<(), HandleError>;
 558         /// Handle an incoming commitment_signed message from the given peer.
 559         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &CommitmentSigned) -> Result<(RevokeAndACK, Option<CommitmentSigned>), HandleError>;
 560         /// Handle an incoming revoke_and_ack message from the given peer.
 561         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &RevokeAndACK) -> Result<Option<CommitmentUpdate>, HandleError>;
 562
 563         /// Handle an incoming update_fee message from the given peer.
 564         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &UpdateFee) -> Result<(), HandleError>;
 565
 566         // Channel-to-announce:
 567         /// Handle an incoming announcement_signatures message from the given peer.
 568         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &AnnouncementSignatures) -> Result<(), HandleError>;
 569
 570         // Connection loss/reestablish:
 571         /// Indicates a connection to the peer failed/an existing connection was lost. If no connection
 572         /// is believed to be possible in the future (eg they're sending us messages we don't
 573         /// understand or indicate they require unknown feature bits), no_connection_possible is set
 574         /// and any outstanding channels should be failed.
 575         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);
 576
 577         /// Handle a peer reconnecting, possibly generating channel_reestablish message(s).
 578         fn peer_connected(&self, their_node_id: &PublicKey) -> Vec<ChannelReestablish>;
 579         /// Handle an incoming channel_reestablish message from the given peer.
 580         fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &ChannelReestablish) -> Result<(Option<FundingLocked>, Option<RevokeAndACK>, Option<CommitmentUpdate>, RAACommitmentOrder), HandleError>;
 581
 582         // Error:
 583         /// Handle an incoming error message from the given peer.
 584         fn handle_error(&self, their_node_id: &PublicKey, msg: &ErrorMessage);
 585 }
 586
 587 /// A trait to describe an object which can receive routing messages.
 588 pub trait RoutingMessageHandler : Send + Sync {
 589         /// Handle an incoming node_announcement message, returning true if it should be forwarded on,
 590         /// false or returning an Err otherwise.
 591         fn handle_node_announcement(&self, msg: &NodeAnnouncement) -> Result<bool, HandleError>;
 592         /// Handle a channel_announcement message, returning true if it should be forwarded on, false
 593         /// or returning an Err otherwise.
 594         fn handle_channel_announcement(&self, msg: &ChannelAnnouncement) -> Result<bool, HandleError>;
 595         /// Handle an incoming channel_update message, returning true if it should be forwarded on,
 596         /// false or returning an Err otherwise.
 597         fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<bool, HandleError>;
 598         /// Handle some updates to the route graph that we learned due to an outbound failed payment.
 599         fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
 600 }
 601
 602 pub(crate) struct OnionRealm0HopData {
 603         pub(crate) short_channel_id: u64,
 604         pub(crate) amt_to_forward: u64,
 605         pub(crate) outgoing_cltv_value: u32,
 606         // 12 bytes of 0-padding
 607 }
 608
 609 mod fuzzy_internal_msgs {
 610         // These types aren't intended to be pub, but are exposed for direct fuzzing (as we deserialize
 611         // them from untrusted input):
 612
 613         use super::OnionRealm0HopData;
 614         pub struct OnionHopData {
 615                 pub(crate) realm: u8,
 616                 pub(crate) data: OnionRealm0HopData,
 617                 pub(crate) hmac: [u8; 32],
 618         }
 619         unsafe impl ::util::internal_traits::NoDealloc for OnionHopData{}
 620
 621         pub struct DecodedOnionErrorPacket {
 622                 pub(crate) hmac: [u8; 32],
 623                 pub(crate) failuremsg: Vec<u8>,
 624                 pub(crate) pad: Vec<u8>,
 625         }
 626 }
 627 #[cfg(feature = "fuzztarget")]
 628 pub use self::fuzzy_internal_msgs::*;
 629 #[cfg(not(feature = "fuzztarget"))]
 630 pub(crate) use self::fuzzy_internal_msgs::*;
 631
 632 #[derive(Clone)]
 633 pub(crate) struct OnionPacket {
 634         pub(crate) version: u8,
 635         /// In order to ensure we always return an error on Onion decode in compliance with BOLT 4, we
 636         /// have to deserialize OnionPackets contained in UpdateAddHTLCs even if the ephemeral public
 637         /// key (here) is bogus, so we hold a Result instead of a PublicKey as we'd like.
 638         pub(crate) public_key: Result<PublicKey, secp256k1::Error>,
 639         pub(crate) hop_data: [u8; 20*65],
 640         pub(crate) hmac: [u8; 32],
 641 }
 642
 643 impl PartialEq for OnionPacket {
 644         fn eq(&self, other: &OnionPacket) -> bool {
 645                 for (i, j) in self.hop_data.iter().zip(other.hop_data.iter()) {
 646                         if i != j { return false; }
 647                 }
 648                 self.version == other.version &&
 649                         self.public_key == other.public_key &&
 650                         self.hmac == other.hmac
 651         }
 652 }
 653
 654 #[derive(Clone, PartialEq)]
 655 pub(crate) struct OnionErrorPacket {
 656         // This really should be a constant size slice, but the spec lets these things be up to 128KB?
 657         // (TODO) We limit it in decode to much lower...
 658         pub(crate) data: Vec<u8>,
 659 }
 660
 661 impl Error for DecodeError {
 662         fn description(&self) -> &str {
 663                 match *self {
 664                         DecodeError::UnknownVersion => "Unknown realm byte in Onion packet",
 665                         DecodeError::UnknownRequiredFeature => "Unknown required feature preventing decode",
 666                         DecodeError::InvalidValue => "Nonsense bytes didn't map to the type they were interpreted as",
 667                         DecodeError::ShortRead => "Packet extended beyond the provided bytes",
 668                         DecodeError::ExtraAddressesPerType => "More than one address of a single type",
 669                         DecodeError::BadLengthDescriptor => "A length descriptor in the packet didn't describe the later data correctly",
 670                         DecodeError::Io(ref e) => e.description(),
 671                 }
 672         }
 673 }
 674 impl fmt::Display for DecodeError {
 675         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 676                 f.write_str(self.description())
 677         }
 678 }
 679
 680 impl fmt::Debug for HandleError {
 681         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 682                 f.write_str(self.err)
 683         }
 684 }
 685
 686 impl From<::std::io::Error> for DecodeError {
 687         fn from(e: ::std::io::Error) -> Self {
 688                 if e.kind() == ::std::io::ErrorKind::UnexpectedEof {
 689                         DecodeError::ShortRead
 690                 } else {
 691                         DecodeError::Io(e)
 692                 }
 693         }
 694 }
 695
 696 impl_writeable_len_match!(AcceptChannel, {
 697                 {AcceptChannel{ shutdown_scriptpubkey: Some(ref script), ..}, 270 + 2 + script.len()},
 698                 {_, 270}
 699         }, {
 700         temporary_channel_id,
 701         dust_limit_satoshis,
 702         max_htlc_value_in_flight_msat,
 703         channel_reserve_satoshis,
 704         htlc_minimum_msat,
 705         minimum_depth,
 706         to_self_delay,
 707         max_accepted_htlcs,
 708         funding_pubkey,
 709         revocation_basepoint,
 710         payment_basepoint,
 711         delayed_payment_basepoint,
 712         htlc_basepoint,
 713         first_per_commitment_point,
 714         shutdown_scriptpubkey
 715 });
 716
 717 impl_writeable!(AnnouncementSignatures, 32+8+64*2, {
 718         channel_id,
 719         short_channel_id,
 720         node_signature,
 721         bitcoin_signature
 722 });
 723
 724 impl Writeable for ChannelReestablish {
 725         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 726                 w.size_hint(if self.data_loss_protect.is_some() { 32+2*8+33+32 } else { 32+2*8 });
 727                 self.channel_id.write(w)?;
 728                 self.next_local_commitment_number.write(w)?;
 729                 self.next_remote_commitment_number.write(w)?;
 730                 if let Some(ref data_loss_protect) = self.data_loss_protect {
 731                         data_loss_protect.your_last_per_commitment_secret.write(w)?;
 732                         data_loss_protect.my_current_per_commitment_point.write(w)?;
 733                 }
 734                 Ok(())
 735         }
 736 }
 737
 738 impl<R: Read> Readable<R> for ChannelReestablish{
 739         fn read(r: &mut R) -> Result<Self, DecodeError> {
 740                 Ok(Self {
 741                         channel_id: Readable::read(r)?,
 742                         next_local_commitment_number: Readable::read(r)?,
 743                         next_remote_commitment_number: Readable::read(r)?,
 744                         data_loss_protect: {
 745                                 match <[u8; 32] as Readable<R>>::read(r) {
 746                                         Ok(your_last_per_commitment_secret) =>
 747                                                 Some(DataLossProtect {
 748                                                         your_last_per_commitment_secret,
 749                                                         my_current_per_commitment_point: Readable::read(r)?,
 750                                                 }),
 751                                         Err(DecodeError::ShortRead) => None,
 752                                         Err(e) => return Err(e)
 753                                 }
 754                         }
 755                 })
 756         }
 757 }
 758
 759 impl_writeable!(ClosingSigned, 32+8+64, {
 760         channel_id,
 761         fee_satoshis,
 762         signature
 763 });
 764
 765 impl_writeable_len_match!(CommitmentSigned, {
 766                 { CommitmentSigned { ref htlc_signatures, .. }, 32+64+2+htlc_signatures.len()*64 }
 767         }, {
 768         channel_id,
 769         signature,
 770         htlc_signatures
 771 });
 772
 773 impl_writeable_len_match!(DecodedOnionErrorPacket, {
 774                 { DecodedOnionErrorPacket { ref failuremsg, ref pad, .. }, 32 + 4 + failuremsg.len() + pad.len() }
 775         }, {
 776         hmac,
 777         failuremsg,
 778         pad
 779 });
 780
 781 impl_writeable!(FundingCreated, 32+32+2+64, {
 782         temporary_channel_id,
 783         funding_txid,
 784         funding_output_index,
 785         signature
 786 });
 787
 788 impl_writeable!(FundingSigned, 32+64, {
 789         channel_id,
 790         signature
 791 });
 792
 793 impl_writeable!(FundingLocked, 32+33, {
 794         channel_id,
 795         next_per_commitment_point
 796 });
 797
 798 impl_writeable_len_match!(GlobalFeatures, {
 799                 { GlobalFeatures { ref flags }, flags.len() + 2 }
 800         }, {
 801         flags
 802 });
 803
 804 impl_writeable_len_match!(LocalFeatures, {
 805                 { LocalFeatures { ref flags }, flags.len() + 2 }
 806         }, {
 807         flags
 808 });
 809
 810 impl_writeable_len_match!(Init, {
 811                 { Init { ref global_features, ref local_features }, global_features.flags.len() + local_features.flags.len() + 4 }
 812         }, {
 813         global_features,
 814         local_features
 815 });
 816
 817 impl_writeable_len_match!(OpenChannel, {
 818                 { OpenChannel { shutdown_scriptpubkey: Some(ref script), .. }, 319 + 2 + script.len() },
 819                 { OpenChannel { shutdown_scriptpubkey: None, .. }, 319 }
 820         }, {
 821         chain_hash,
 822         temporary_channel_id,
 823         funding_satoshis,
 824         push_msat,
 825         dust_limit_satoshis,
 826         max_htlc_value_in_flight_msat,
 827         channel_reserve_satoshis,
 828         htlc_minimum_msat,
 829         feerate_per_kw,
 830         to_self_delay,
 831         max_accepted_htlcs,
 832         funding_pubkey,
 833         revocation_basepoint,
 834         payment_basepoint,
 835         delayed_payment_basepoint,
 836         htlc_basepoint,
 837         first_per_commitment_point,
 838         channel_flags,
 839         shutdown_scriptpubkey
 840 });
 841
 842 impl_writeable!(RevokeAndACK, 32+32+33, {
 843         channel_id,
 844         per_commitment_secret,
 845         next_per_commitment_point
 846 });
 847
 848 impl_writeable_len_match!(Shutdown, {
 849                 { Shutdown { ref scriptpubkey, .. }, 32 + 2 + scriptpubkey.len() }
 850         }, {
 851         channel_id,
 852         scriptpubkey
 853 });
 854
 855 impl_writeable_len_match!(UpdateFailHTLC, {
 856                 { UpdateFailHTLC { ref reason, .. }, 32 + 10 + reason.data.len() }
 857         }, {
 858         channel_id,
 859         htlc_id,
 860         reason
 861 });
 862
 863 impl_writeable!(UpdateFailMalformedHTLC, 32+8+32+2, {
 864         channel_id,
 865         htlc_id,
 866         sha256_of_onion,
 867         failure_code
 868 });
 869
 870 impl_writeable!(UpdateFee, 32+4, {
 871         channel_id,
 872         feerate_per_kw
 873 });
 874
 875 impl_writeable!(UpdateFulfillHTLC, 32+8+32, {
 876         channel_id,
 877         htlc_id,
 878         payment_preimage
 879 });
 880
 881 impl_writeable_len_match!(OnionErrorPacket, {
 882                 { OnionErrorPacket { ref data, .. }, 2 + data.len() }
 883         }, {
 884         data
 885 });
 886
 887 impl Writeable for OnionPacket {
 888         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 889                 w.size_hint(1 + 33 + 20*65 + 32);
 890                 self.version.write(w)?;
 891                 match self.public_key {
 892                         Ok(pubkey) => pubkey.write(w)?,
 893                         Err(_) => [0u8;33].write(w)?,
 894                 }
 895                 w.write_all(&self.hop_data)?;
 896                 self.hmac.write(w)?;
 897                 Ok(())
 898         }
 899 }
 900
 901 impl<R: Read> Readable<R> for OnionPacket {
 902         fn read(r: &mut R) -> Result<Self, DecodeError> {
 903                 Ok(OnionPacket {
 904                         version: Readable::read(r)?,
 905                         public_key: {
 906                                 let mut buf = [0u8;33];
 907                                 r.read_exact(&mut buf)?;
 908                                 PublicKey::from_slice(&Secp256k1::without_caps(), &buf)
 909                         },
 910                         hop_data: Readable::read(r)?,
 911                         hmac: Readable::read(r)?,
 912                 })
 913         }
 914 }
 915
 916 impl_writeable!(UpdateAddHTLC, 32+8+8+32+4+1366, {
 917         channel_id,
 918         htlc_id,
 919         amount_msat,
 920         payment_hash,
 921         cltv_expiry,
 922         onion_routing_packet
 923 });
 924
 925 impl Writeable for OnionRealm0HopData {
 926         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 927                 w.size_hint(32);
 928                 self.short_channel_id.write(w)?;
 929                 self.amt_to_forward.write(w)?;
 930                 self.outgoing_cltv_value.write(w)?;
 931                 w.write_all(&[0;12])?;
 932                 Ok(())
 933         }
 934 }
 935
 936 impl<R: Read> Readable<R> for OnionRealm0HopData {
 937         fn read(r: &mut R) -> Result<Self, DecodeError> {
 938                 Ok(OnionRealm0HopData {
 939                         short_channel_id: Readable::read(r)?,
 940                         amt_to_forward: Readable::read(r)?,
 941                         outgoing_cltv_value: {
 942                                 let v: u32 = Readable::read(r)?;
 943                                 r.read_exact(&mut [0; 12])?;
 944                                 v
 945                         }
 946                 })
 947         }
 948 }
 949
 950 impl Writeable for OnionHopData {
 951         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 952                 w.size_hint(65);
 953                 self.realm.write(w)?;
 954                 self.data.write(w)?;
 955                 self.hmac.write(w)?;
 956                 Ok(())
 957         }
 958 }
 959
 960 impl<R: Read> Readable<R> for OnionHopData {
 961         fn read(r: &mut R) -> Result<Self, DecodeError> {
 962                 Ok(OnionHopData {
 963                         realm: {
 964                                 let r: u8 = Readable::read(r)?;
 965                                 if r != 0 {
 966                                         return Err(DecodeError::UnknownVersion);
 967                                 }
 968                                 r
 969                         },
 970                         data: Readable::read(r)?,
 971                         hmac: Readable::read(r)?,
 972                 })
 973         }
 974 }
 975
 976 impl Writeable for Ping {
 977         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 978                 w.size_hint(self.byteslen as usize + 4);
 979                 self.ponglen.write(w)?;
 980                 vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
 981                 Ok(())
 982         }
 983 }
 984
 985 impl<R: Read> Readable<R> for Ping {
 986         fn read(r: &mut R) -> Result<Self, DecodeError> {
 987                 Ok(Ping {
 988                         ponglen: Readable::read(r)?,
 989                         byteslen: {
 990                                 let byteslen = Readable::read(r)?;
 991                                 r.read_exact(&mut vec![0u8; byteslen as usize][..])?;
 992                                 byteslen
 993                         }
 994                 })
 995         }
 996 }
 997
 998 impl Writeable for Pong {
 999         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
1000                 w.size_hint(self.byteslen as usize + 2);
1001                 vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
1002                 Ok(())
1003         }
1004 }
1005
1006 impl<R: Read> Readable<R> for Pong {
1007         fn read(r: &mut R) -> Result<Self, DecodeError> {
1008                 Ok(Pong {
1009                         byteslen: {
1010                                 let byteslen = Readable::read(r)?;
1011                                 r.read_exact(&mut vec![0u8; byteslen as usize][..])?;
1012                                 byteslen
1013                         }
1014                 })
1015         }
1016 }
1017
1018 impl Writeable for UnsignedChannelAnnouncement {
1019         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
1020                 w.size_hint(2 + 2*32 + 4*33 + self.features.flags.len() + self.excess_data.len());
1021                 self.features.write(w)?;
1022                 self.chain_hash.write(w)?;
1023                 self.short_channel_id.write(w)?;
1024                 self.node_id_1.write(w)?;
1025                 self.node_id_2.write(w)?;
1026                 self.bitcoin_key_1.write(w)?;
1027                 self.bitcoin_key_2.write(w)?;
1028                 w.write_all(&self.excess_data[..])?;
1029                 Ok(())
1030         }
1031 }
1032
1033 impl<R: Read> Readable<R> for UnsignedChannelAnnouncement {
1034         fn read(r: &mut R) -> Result<Self, DecodeError> {
1035                 Ok(Self {
1036                         features: {
1037                                 let f: GlobalFeatures = Readable::read(r)?;
1038                                 if f.requires_unknown_bits() {
1039                                         return Err(DecodeError::UnknownRequiredFeature);
1040                                 }
1041                                 f
1042                         },
1043                         chain_hash: Readable::read(r)?,
1044                         short_channel_id: Readable::read(r)?,
1045                         node_id_1: Readable::read(r)?,
1046                         node_id_2: Readable::read(r)?,
1047                         bitcoin_key_1: Readable::read(r)?,
1048                         bitcoin_key_2: Readable::read(r)?,
1049                         excess_data: {
1050                                 let mut excess_data = vec![];
1051                                 r.read_to_end(&mut excess_data)?;
1052                                 excess_data
1053                         },
1054                 })
1055         }
1056 }
1057
1058 impl_writeable_len_match!(ChannelAnnouncement, {
1059                 { ChannelAnnouncement { contents: UnsignedChannelAnnouncement {ref features, ref excess_data, ..}, .. },
1060                         2 + 2*32 + 4*33 + features.flags.len() + excess_data.len() + 4*64 }
1061         }, {
1062         node_signature_1,
1063         node_signature_2,
1064         bitcoin_signature_1,
1065         bitcoin_signature_2,
1066         contents
1067 });
1068
1069 impl Writeable for UnsignedChannelUpdate {
1070         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
1071                 w.size_hint(64 + self.excess_data.len());
1072                 self.chain_hash.write(w)?;
1073                 self.short_channel_id.write(w)?;
1074                 self.timestamp.write(w)?;
1075                 self.flags.write(w)?;
1076                 self.cltv_expiry_delta.write(w)?;
1077                 self.htlc_minimum_msat.write(w)?;
1078                 self.fee_base_msat.write(w)?;
1079                 self.fee_proportional_millionths.write(w)?;
1080                 w.write_all(&self.excess_data[..])?;
1081                 Ok(())
1082         }
1083 }
1084
1085 impl<R: Read> Readable<R> for UnsignedChannelUpdate {
1086         fn read(r: &mut R) -> Result<Self, DecodeError> {
1087                 Ok(Self {
1088                         chain_hash: Readable::read(r)?,
1089                         short_channel_id: Readable::read(r)?,
1090                         timestamp: Readable::read(r)?,
1091                         flags: Readable::read(r)?,
1092                         cltv_expiry_delta: Readable::read(r)?,
1093                         htlc_minimum_msat: Readable::read(r)?,
1094                         fee_base_msat: Readable::read(r)?,
1095                         fee_proportional_millionths: Readable::read(r)?,
1096                         excess_data: {
1097                                 let mut excess_data = vec![];
1098                                 r.read_to_end(&mut excess_data)?;
1099                                 excess_data
1100                         },
1101                 })
1102         }
1103 }
1104
1105 impl_writeable_len_match!(ChannelUpdate, {
1106                 { ChannelUpdate { contents: UnsignedChannelUpdate {ref excess_data, ..}, .. },
1107                         64 + excess_data.len() + 64 }
1108         }, {
1109         signature,
1110         contents
1111 });
1112
1113 impl Writeable for ErrorMessage {
1114         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
1115                 w.size_hint(32 + 2 + self.data.len());
1116                 self.channel_id.write(w)?;
1117                 (self.data.len() as u16).write(w)?;
1118                 w.write_all(self.data.as_bytes())?;
1119                 Ok(())
1120         }
1121 }
1122
1123 impl<R: Read> Readable<R> for ErrorMessage {
1124         fn read(r: &mut R) -> Result<Self, DecodeError> {
1125                 Ok(Self {
1126                         channel_id: Readable::read(r)?,
1127                         data: {
1128                                 let mut sz: usize = <u16 as Readable<R>>::read(r)? as usize;
1129                                 let mut data = vec![];
1130                                 let data_len = r.read_to_end(&mut data)?;
1131                                 sz = cmp::min(data_len, sz);
1132                                 match String::from_utf8(data[..sz as usize].to_vec()) {
1133                                         Ok(s) => s,
1134                                         Err(_) => return Err(DecodeError::InvalidValue),
1135                                 }
1136                         }
1137                 })
1138         }
1139 }
1140
1141 impl Writeable for UnsignedNodeAnnouncement {
1142         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
1143                 w.size_hint(64 + 76 + self.features.flags.len() + self.addresses.len()*38 + self.excess_address_data.len() + self.excess_data.len());
1144                 self.features.write(w)?;
1145                 self.timestamp.write(w)?;
1146                 self.node_id.write(w)?;
1147                 w.write_all(&self.rgb)?;
1148                 self.alias.write(w)?;
1149
1150                 let mut addr_slice = Vec::with_capacity(self.addresses.len() * 18);
1151                 let mut addrs_to_encode = self.addresses.clone();
1152                 addrs_to_encode.sort_unstable_by(|a, b| { a.get_id().cmp(&b.get_id()) });
1153                 addrs_to_encode.dedup_by(|a, b| { a.get_id() == b.get_id() });
1154                 for addr in addrs_to_encode.iter() {
1155                         match addr {
1156                                 &NetAddress::IPv4{addr, port} => {
1157                                         addr_slice.push(1);
1158                                         addr_slice.extend_from_slice(&addr);
1159                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1160                                 },
1161                                 &NetAddress::IPv6{addr, port} => {
1162                                         addr_slice.push(2);
1163                                         addr_slice.extend_from_slice(&addr);
1164                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1165                                 },
1166                                 &NetAddress::OnionV2{addr, port} => {
1167                                         addr_slice.push(3);
1168                                         addr_slice.extend_from_slice(&addr);
1169                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1170                                 },
1171                                 &NetAddress::OnionV3{ed25519_pubkey, checksum, version, port} => {
1172                                         addr_slice.push(4);
1173                                         addr_slice.extend_from_slice(&ed25519_pubkey);
1174                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(checksum));
1175                                         addr_slice.push(version);
1176                                         addr_slice.extend_from_slice(&byte_utils::be16_to_array(port));
1177                                 },
1178                         }
1179                 }
1180                 ((addr_slice.len() + self.excess_address_data.len()) as u16).write(w)?;
1181                 w.write_all(&addr_slice[..])?;
1182                 w.write_all(&self.excess_address_data[..])?;
1183                 w.write_all(&self.excess_data[..])?;
1184                 Ok(())
1185         }
1186 }
1187
1188 impl<R: Read> Readable<R> for UnsignedNodeAnnouncement {
1189         fn read(r: &mut R) -> Result<Self, DecodeError> {
1190                 let features: GlobalFeatures = Readable::read(r)?;
1191                 if features.requires_unknown_bits() {
1192                         return Err(DecodeError::UnknownRequiredFeature);
1193                 }
1194                 let timestamp: u32 = Readable::read(r)?;
1195                 let node_id: PublicKey = Readable::read(r)?;
1196                 let mut rgb = [0; 3];
1197                 r.read_exact(&mut rgb)?;
1198                 let alias: [u8; 32] = Readable::read(r)?;
1199
1200                 let addrlen: u16 = Readable::read(r)?;
1201                 let mut addr_readpos = 0;
1202                 let mut addresses = Vec::with_capacity(4);
1203                 let mut f: u8 = 0;
1204                 let mut excess = 0;
1205                 loop {
1206                         if addrlen <= addr_readpos { break; }
1207                         f = Readable::read(r)?;
1208                         match f {
1209                                 1 => {
1210                                         if addresses.len() > 0 {
1211                                                 return Err(DecodeError::ExtraAddressesPerType);
1212                                         }
1213                                         if addrlen < addr_readpos + 1 + 6 {
1214                                                 return Err(DecodeError::BadLengthDescriptor);
1215                                         }
1216                                         addresses.push(NetAddress::IPv4 {
1217                                                 addr: {
1218                                                         let mut addr = [0; 4];
1219                                                         r.read_exact(&mut addr)?;
1220                                                         addr
1221                                                 },
1222                                                 port: Readable::read(r)?,
1223                                         });
1224                                         addr_readpos += 1 + 6
1225                                 },
1226                                 2 => {
1227                                         if addresses.len() > 1 || (addresses.len() == 1 && addresses[0].get_id() != 1) {
1228                                                 return Err(DecodeError::ExtraAddressesPerType);
1229                                         }
1230                                         if addrlen < addr_readpos + 1 + 18 {
1231                                                 return Err(DecodeError::BadLengthDescriptor);
1232                                         }
1233                                         addresses.push(NetAddress::IPv6 {
1234                                                 addr: {
1235                                                         let mut addr = [0; 16];
1236                                                         r.read_exact(&mut addr)?;
1237                                                         addr
1238                                                 },
1239                                                 port: Readable::read(r)?,
1240                                         });
1241                                         addr_readpos += 1 + 18
1242                                 },
1243                                 3 => {
1244                                         if addresses.len() > 2 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 2) {
1245                                                 return Err(DecodeError::ExtraAddressesPerType);
1246                                         }
1247                                         if addrlen < addr_readpos + 1 + 12 {
1248                                                 return Err(DecodeError::BadLengthDescriptor);
1249                                         }
1250                                         addresses.push(NetAddress::OnionV2 {
1251                                                 addr: {
1252                                                         let mut addr = [0; 10];
1253                                                         r.read_exact(&mut addr)?;
1254                                                         addr
1255                                                 },
1256                                                 port: Readable::read(r)?,
1257                                         });
1258                                         addr_readpos += 1 + 12
1259                                 },
1260                                 4 => {
1261                                         if addresses.len() > 3 || (addresses.len() > 0 && addresses.last().unwrap().get_id() > 3) {
1262                                                 return Err(DecodeError::ExtraAddressesPerType);
1263                                         }
1264                                         if addrlen < addr_readpos + 1 + 37 {
1265                                                 return Err(DecodeError::BadLengthDescriptor);
1266                                         }
1267                                         addresses.push(NetAddress::OnionV3 {
1268                                                 ed25519_pubkey: Readable::read(r)?,
1269                                                 checksum: Readable::read(r)?,
1270                                                 version: Readable::read(r)?,
1271                                                 port: Readable::read(r)?,
1272                                         });
1273                                         addr_readpos += 1 + 37
1274                                 },
1275                                 _ => { excess = 1; break; }
1276                         }
1277                 }
1278
1279                 let mut excess_data = vec![];
1280                 let excess_address_data = if addr_readpos < addrlen {
1281                         let mut excess_address_data = vec![0; (addrlen - addr_readpos) as usize];
1282                         r.read_exact(&mut excess_address_data[excess..])?;
1283                         if excess == 1 {
1284                                 excess_address_data[0] = f;
1285                         }
1286                         excess_address_data
1287                 } else {
1288                         if excess == 1 {
1289                                 excess_data.push(f);
1290                         }
1291                         Vec::new()
1292                 };
1293
1294                 Ok(UnsignedNodeAnnouncement {
1295                         features: features,
1296                         timestamp: timestamp,
1297                         node_id: node_id,
1298                         rgb: rgb,
1299                         alias: alias,
1300                         addresses: addresses,
1301                         excess_address_data: excess_address_data,
1302                         excess_data: {
1303                                 r.read_to_end(&mut excess_data)?;
1304                                 excess_data
1305                         },
1306                 })
1307         }
1308 }
1309
1310 impl_writeable_len_match!(NodeAnnouncement, {
1311                 { NodeAnnouncement { contents: UnsignedNodeAnnouncement { ref features, ref addresses, ref excess_address_data, ref excess_data, ..}, .. },
1312                         64 + 76 + features.flags.len() + addresses.len()*38 + excess_address_data.len() + excess_data.len() }
1313         }, {
1314         signature,
1315         contents
1316 });
1317
1318 #[cfg(test)]
1319 mod tests {
1320         use hex;
1321         use ln::msgs;
1322         use util::ser::Writeable;
1323         use secp256k1::key::{PublicKey,SecretKey};
1324         use secp256k1::Secp256k1;
1325
1326         #[test]
1327         fn encoding_channel_reestablish_no_secret() {
1328                 let cr = msgs::ChannelReestablish {
1329                         channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
1330                         next_local_commitment_number: 3,
1331                         next_remote_commitment_number: 4,
1332                         data_loss_protect: None,
1333                 };
1334
1335                 let encoded_value = cr.encode();
1336                 assert_eq!(
1337                         encoded_value,
1338                         vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4]
1339                 );
1340         }
1341
1342         #[test]
1343         fn encoding_channel_reestablish_with_secret() {
1344                 let public_key = {
1345                         let secp_ctx = Secp256k1::new();
1346                         PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap())
1347                 };
1348
1349                 let cr = msgs::ChannelReestablish {
1350                         channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
1351                         next_local_commitment_number: 3,
1352                         next_remote_commitment_number: 4,
1353                         data_loss_protect: Some(msgs::DataLossProtect { your_last_per_commitment_secret: [9;32], my_current_per_commitment_point: public_key}),
1354                 };
1355
1356                 let encoded_value = cr.encode();
1357                 assert_eq!(
1358                         encoded_value,
1359                         vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 3, 27, 132, 197, 86, 123, 18, 100, 64, 153, 93, 62, 213, 170, 186, 5, 101, 215, 30, 24, 52, 96, 72, 25, 255, 156, 23, 245, 233, 213, 221, 7, 143]
1360                 );
1361         }
1362 }