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