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

   1 //! Top level peer message handling and socket handling logic lives here.
   2 //!
   3 //! Instead of actually servicing sockets ourselves we require that you implement the
   4 //! SocketDescriptor interface and use that to receive actions which you should perform on the
   5 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
   6 //! call into the provided message handlers (probably a ChannelManager and Router) with messages
   7 //! they should handle, and encoding/sending response messages.
   8
   9 use secp256k1::key::{SecretKey,PublicKey};
  10
  11 use ln::features::InitFeatures;
  12 use ln::msgs;
  13 use ln::msgs::ChannelMessageHandler;
  14 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
  15 use util::ser::VecWriter;
  16 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  17 use ln::wire;
  18 use ln::wire::Encode;
  19 use util::byte_utils;
  20 use util::events::{MessageSendEvent, MessageSendEventsProvider};
  21 use util::logger::Logger;
  22
  23 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
  24 use std::sync::{Arc, Mutex};
  25 use std::sync::atomic::{AtomicUsize, Ordering};
  26 use std::{cmp,error,hash,fmt};
  27 use std::ops::Deref;
  28
  29 use bitcoin_hashes::sha256::Hash as Sha256;
  30 use bitcoin_hashes::sha256::HashEngine as Sha256Engine;
  31 use bitcoin_hashes::{HashEngine, Hash};
  32
  33 /// Provides references to trait impls which handle different types of messages.
  34 pub struct MessageHandler<CM: Deref> where CM::Target: msgs::ChannelMessageHandler {
  35         /// A message handler which handles messages specific to channels. Usually this is just a
  36         /// ChannelManager object.
  37         pub chan_handler: CM,
  38         /// A message handler which handles messages updating our knowledge of the network channel
  39         /// graph. Usually this is just a Router object.
  40         pub route_handler: Arc<msgs::RoutingMessageHandler>,
  41 }
  42
  43 /// Provides an object which can be used to send data to and which uniquely identifies a connection
  44 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
  45 /// implement Hash to meet the PeerManager API.
  46 ///
  47 /// For efficiency, Clone should be relatively cheap for this type.
  48 ///
  49 /// You probably want to just extend an int and put a file descriptor in a struct and implement
  50 /// send_data. Note that if you are using a higher-level net library that may close() itself, be
  51 /// careful to ensure you don't have races whereby you might register a new connection with an fd
  52 /// the same as a yet-to-be-socket_disconnected()-ed.
  53 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
  54         /// Attempts to send some data from the given slice to the peer.
  55         ///
  56         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
  57         /// Note that in the disconnected case, a socket_disconnected must still fire and further write
  58         /// attempts may occur until that time.
  59         ///
  60         /// If the returned size is smaller than data.len(), a write_available event must
  61         /// trigger the next time more data can be written. Additionally, until the a send_data event
  62         /// completes fully, no further read_events should trigger on the same peer!
  63         ///
  64         /// If a read_event on this descriptor had previously returned true (indicating that read
  65         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
  66         /// indicating that read events on this descriptor should resume. A resume_read of false does
  67         /// *not* imply that further read events should be paused.
  68         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
  69         /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
  70         /// more calls to write_buffer_space_avail, read_event or socket_disconnected may be made with
  71         /// this descriptor. No socket_disconnected call should be generated as a result of this call,
  72         /// though obviously races may occur whereby disconnect_socket is called after a call to
  73         /// socket_disconnected but prior to that event completing.
  74         fn disconnect_socket(&mut self);
  75 }
  76
  77 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
  78 /// generate no further read_event/write_buffer_space_avail calls for the descriptor, only
  79 /// triggering a single socket_disconnected call (unless it was provided in response to a
  80 /// new_*_connection event, in which case no such socket_disconnected() must be generated and the
  81 /// socket be silently disconencted).
  82 pub struct PeerHandleError {
  83         /// Used to indicate that we probably can't make any future connections to this peer, implying
  84         /// we should go ahead and force-close any channels we have with it.
  85         no_connection_possible: bool,
  86 }
  87 impl fmt::Debug for PeerHandleError {
  88         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  89                 formatter.write_str("Peer Sent Invalid Data")
  90         }
  91 }
  92 impl fmt::Display for PeerHandleError {
  93         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  94                 formatter.write_str("Peer Sent Invalid Data")
  95         }
  96 }
  97 impl error::Error for PeerHandleError {
  98         fn description(&self) -> &str {
  99                 "Peer Sent Invalid Data"
 100         }
 101 }
 102
 103 enum InitSyncTracker{
 104         NoSyncRequested,
 105         ChannelsSyncing(u64),
 106         NodesSyncing(PublicKey),
 107 }
 108
 109 struct Peer {
 110         channel_encryptor: PeerChannelEncryptor,
 111         outbound: bool,
 112         their_node_id: Option<PublicKey>,
 113         their_features: Option<InitFeatures>,
 114
 115         pending_outbound_buffer: LinkedList<Vec<u8>>,
 116         pending_outbound_buffer_first_msg_offset: usize,
 117         awaiting_write_event: bool,
 118
 119         pending_read_buffer: Vec<u8>,
 120         pending_read_buffer_pos: usize,
 121         pending_read_is_header: bool,
 122
 123         sync_status: InitSyncTracker,
 124
 125         awaiting_pong: bool,
 126 }
 127
 128 impl Peer {
 129         /// Returns true if the channel announcements/updates for the given channel should be
 130         /// forwarded to this peer.
 131         /// If we are sending our routing table to this peer and we have not yet sent channel
 132         /// announcements/updates for the given channel_id then we will send it when we get to that
 133         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 134         /// sent the old versions, we should send the update, and so return true here.
 135         fn should_forward_channel(&self, channel_id: u64)->bool{
 136                 match self.sync_status {
 137                         InitSyncTracker::NoSyncRequested => true,
 138                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 139                         InitSyncTracker::NodesSyncing(_) => true,
 140                 }
 141         }
 142 }
 143
 144 struct PeerHolder<Descriptor: SocketDescriptor> {
 145         peers: HashMap<Descriptor, Peer>,
 146         /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
 147         /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
 148         peers_needing_send: HashSet<Descriptor>,
 149         /// Only add to this set when noise completes:
 150         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
 151 }
 152
 153 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 154 fn _check_usize_is_32_or_64() {
 155         // See below, less than 32 bit pointers may be unsafe here!
 156         unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
 157 }
 158
 159 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
 160 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 161 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 162 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
 163 /// issues such as overly long function definitions.
 164 pub type SimpleArcPeerManager<SD, M> = Arc<PeerManager<SD, SimpleArcChannelManager<M>>>;
 165
 166 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
 167 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
 168 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
 169 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 170 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
 171 /// helps with issues such as long function definitions.
 172 pub type SimpleRefPeerManager<'a, SD, M> = PeerManager<SD, SimpleRefChannelManager<'a, M>>;
 173
 174 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
 175 /// events into messages which it passes on to its MessageHandlers.
 176 ///
 177 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
 178 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
 179 /// essentially you should default to using a SimpleRefPeerManager, and use a
 180 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
 181 /// you're using lightning-net-tokio.
 182 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref> where CM::Target: msgs::ChannelMessageHandler {
 183         message_handler: MessageHandler<CM>,
 184         peers: Mutex<PeerHolder<Descriptor>>,
 185         our_node_secret: SecretKey,
 186         ephemeral_key_midstate: Sha256Engine,
 187
 188         // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
 189         // bits we will never realistically count into high:
 190         peer_counter_low: AtomicUsize,
 191         peer_counter_high: AtomicUsize,
 192
 193         logger: Arc<Logger>,
 194 }
 195
 196 macro_rules! encode_msg {
 197         ($msg: expr) => {{
 198                 let mut buffer = VecWriter(Vec::new());
 199                 wire::write($msg, &mut buffer).unwrap();
 200                 buffer.0
 201         }}
 202 }
 203
 204 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 205 /// PeerIds may repeat, but only after socket_disconnected() has been called.
 206 impl<Descriptor: SocketDescriptor, CM: Deref> PeerManager<Descriptor, CM> where CM::Target: msgs::ChannelMessageHandler {
 207         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 208         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 209         /// cryptographically secure random bytes.
 210         pub fn new(message_handler: MessageHandler<CM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: Arc<Logger>) -> PeerManager<Descriptor, CM> {
 211                 let mut ephemeral_key_midstate = Sha256::engine();
 212                 ephemeral_key_midstate.input(ephemeral_random_data);
 213
 214                 PeerManager {
 215                         message_handler: message_handler,
 216                         peers: Mutex::new(PeerHolder {
 217                                 peers: HashMap::new(),
 218                                 peers_needing_send: HashSet::new(),
 219                                 node_id_to_descriptor: HashMap::new()
 220                         }),
 221                         our_node_secret: our_node_secret,
 222                         ephemeral_key_midstate,
 223                         peer_counter_low: AtomicUsize::new(0),
 224                         peer_counter_high: AtomicUsize::new(0),
 225                         logger,
 226                 }
 227         }
 228
 229         /// Get the list of node ids for peers which have completed the initial handshake.
 230         ///
 231         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 232         /// new_outbound_connection, however entries will only appear once the initial handshake has
 233         /// completed and we are sure the remote peer has the private key for the given node_id.
 234         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 235                 let peers = self.peers.lock().unwrap();
 236                 peers.peers.values().filter_map(|p| {
 237                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
 238                                 return None;
 239                         }
 240                         p.their_node_id
 241                 }).collect()
 242         }
 243
 244         fn get_ephemeral_key(&self) -> SecretKey {
 245                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 246                 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
 247                 let high = if low == 0 {
 248                         self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
 249                 } else {
 250                         self.peer_counter_high.load(Ordering::Acquire)
 251                 };
 252                 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
 253                 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
 254                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 255         }
 256
 257         /// Indicates a new outbound connection has been established to a node with the given node_id.
 258         /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
 259         /// descriptor but must disconnect the connection immediately.
 260         ///
 261         /// Returns a small number of bytes to send to the remote node (currently always 50).
 262         ///
 263         /// Panics if descriptor is duplicative with some other descriptor which has not yet had a
 264         /// socket_disconnected().
 265         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 266                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 267                 let res = peer_encryptor.get_act_one().to_vec();
 268                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 269
 270                 let mut peers = self.peers.lock().unwrap();
 271                 if peers.peers.insert(descriptor, Peer {
 272                         channel_encryptor: peer_encryptor,
 273                         outbound: true,
 274                         their_node_id: None,
 275                         their_features: None,
 276
 277                         pending_outbound_buffer: LinkedList::new(),
 278                         pending_outbound_buffer_first_msg_offset: 0,
 279                         awaiting_write_event: false,
 280
 281                         pending_read_buffer: pending_read_buffer,
 282                         pending_read_buffer_pos: 0,
 283                         pending_read_is_header: false,
 284
 285                         sync_status: InitSyncTracker::NoSyncRequested,
 286
 287                         awaiting_pong: false,
 288                 }).is_some() {
 289                         panic!("PeerManager driver duplicated descriptors!");
 290                 };
 291                 Ok(res)
 292         }
 293
 294         /// Indicates a new inbound connection has been established.
 295         ///
 296         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 297         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 298         /// call socket_disconnected for the new descriptor but must disconnect the connection
 299         /// immediately.
 300         ///
 301         /// Panics if descriptor is duplicative with some other descriptor which has not yet had
 302         /// socket_disconnected called.
 303         pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
 304                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 305                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 306
 307                 let mut peers = self.peers.lock().unwrap();
 308                 if peers.peers.insert(descriptor, Peer {
 309                         channel_encryptor: peer_encryptor,
 310                         outbound: false,
 311                         their_node_id: None,
 312                         their_features: None,
 313
 314                         pending_outbound_buffer: LinkedList::new(),
 315                         pending_outbound_buffer_first_msg_offset: 0,
 316                         awaiting_write_event: false,
 317
 318                         pending_read_buffer: pending_read_buffer,
 319                         pending_read_buffer_pos: 0,
 320                         pending_read_is_header: false,
 321
 322                         sync_status: InitSyncTracker::NoSyncRequested,
 323
 324                         awaiting_pong: false,
 325                 }).is_some() {
 326                         panic!("PeerManager driver duplicated descriptors!");
 327                 };
 328                 Ok(())
 329         }
 330
 331         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
 332                 macro_rules! encode_and_send_msg {
 333                         ($msg: expr) => {
 334                                 {
 335                                         log_trace!(self, "Encoding and sending sync update message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 336                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg)[..]));
 337                                 }
 338                         }
 339                 }
 340                 const MSG_BUFF_SIZE: usize = 10;
 341                 while !peer.awaiting_write_event {
 342                         if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
 343                                 match peer.sync_status {
 344                                         InitSyncTracker::NoSyncRequested => {},
 345                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 346                                                 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
 347                                                 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(0, steps);
 348                                                 for &(ref announce, ref update_a, ref update_b) in all_messages.iter() {
 349                                                         encode_and_send_msg!(announce);
 350                                                         encode_and_send_msg!(update_a);
 351                                                         encode_and_send_msg!(update_b);
 352                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 353                                                 }
 354                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 355                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 356                                                 }
 357                                         },
 358                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 359                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 360                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
 361                                                 for msg in all_messages.iter() {
 362                                                         encode_and_send_msg!(msg);
 363                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 364                                                 }
 365                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 366                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 367                                                 }
 368                                         },
 369                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 370                                         InitSyncTracker::NodesSyncing(key) => {
 371                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 372                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
 373                                                 for msg in all_messages.iter() {
 374                                                         encode_and_send_msg!(msg);
 375                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 376                                                 }
 377                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 378                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 379                                                 }
 380                                         },
 381                                 }
 382                         }
 383
 384                         if {
 385                                 let next_buff = match peer.pending_outbound_buffer.front() {
 386                                         None => return,
 387                                         Some(buff) => buff,
 388                                 };
 389
 390                                 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
 391                                 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 392                                 let data_sent = descriptor.send_data(pending, should_be_reading);
 393                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 394                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 395                         } {
 396                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 397                                 peer.pending_outbound_buffer.pop_front();
 398                         } else {
 399                                 peer.awaiting_write_event = true;
 400                         }
 401                 }
 402         }
 403
 404         /// Indicates that there is room to write data to the given socket descriptor.
 405         ///
 406         /// May return an Err to indicate that the connection should be closed.
 407         ///
 408         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 409         /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
 410         /// invariants around calling write_buffer_space_avail in case a write did not fully complete
 411         /// must still hold - be ready to call write_buffer_space_avail again if a write call generated
 412         /// here isn't sufficient! Panics if the descriptor was not previously registered in a
 413         /// new_\*_connection event.
 414         pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 415                 let mut peers = self.peers.lock().unwrap();
 416                 match peers.peers.get_mut(descriptor) {
 417                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 418                         Some(peer) => {
 419                                 peer.awaiting_write_event = false;
 420                                 self.do_attempt_write_data(descriptor, peer);
 421                         }
 422                 };
 423                 Ok(())
 424         }
 425
 426         /// Indicates that data was read from the given socket descriptor.
 427         ///
 428         /// May return an Err to indicate that the connection should be closed.
 429         ///
 430         /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
 431         /// Thus, however, you almost certainly want to call process_events() after any read_event to
 432         /// generate send_data calls to handle responses.
 433         ///
 434         /// If Ok(true) is returned, further read_events should not be triggered until a send_data call
 435         /// on this file descriptor has resume_read set (preventing DoS issues in the send buffer).
 436         ///
 437         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 438         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 439                 match self.do_read_event(peer_descriptor, data) {
 440                         Ok(res) => Ok(res),
 441                         Err(e) => {
 442                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 443                                 Err(e)
 444                         }
 445                 }
 446         }
 447
 448         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 449                 let pause_read = {
 450                         let mut peers_lock = self.peers.lock().unwrap();
 451                         let peers = &mut *peers_lock;
 452                         let pause_read = match peers.peers.get_mut(peer_descriptor) {
 453                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 454                                 Some(peer) => {
 455                                         assert!(peer.pending_read_buffer.len() > 0);
 456                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 457
 458                                         let mut read_pos = 0;
 459                                         while read_pos < data.len() {
 460                                                 {
 461                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 462                                                         peer.pending_read_buffer[peer.pending_read_buffer_pos..peer.pending_read_buffer_pos + data_to_copy].copy_from_slice(&data[read_pos..read_pos + data_to_copy]);
 463                                                         read_pos += data_to_copy;
 464                                                         peer.pending_read_buffer_pos += data_to_copy;
 465                                                 }
 466
 467                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 468                                                         peer.pending_read_buffer_pos = 0;
 469
 470                                                         macro_rules! encode_and_send_msg {
 471                                                                 ($msg: expr) => {
 472                                                                         {
 473                                                                                 log_trace!(self, "Encoding and sending message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 474                                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&$msg)[..]));
 475                                                                                 peers.peers_needing_send.insert(peer_descriptor.clone());
 476                                                                         }
 477                                                                 }
 478                                                         }
 479
 480                                                         macro_rules! try_potential_handleerror {
 481                                                                 ($thing: expr) => {
 482                                                                         match $thing {
 483                                                                                 Ok(x) => x,
 484                                                                                 Err(e) => {
 485                                                                                         match e.action {
 486                                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 487                                                                                                         //TODO: Try to push msg
 488                                                                                                         log_trace!(self, "Got Err handling message, disconnecting peer because {}", e.err);
 489                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 490                                                                                                 },
 491                                                                                                 msgs::ErrorAction::IgnoreError => {
 492                                                                                                         log_trace!(self, "Got Err handling message, ignoring because {}", e.err);
 493                                                                                                         continue;
 494                                                                                                 },
 495                                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
 496                                                                                                         log_trace!(self, "Got Err handling message, sending Error message because {}", e.err);
 497                                                                                                         encode_and_send_msg!(msg);
 498                                                                                                         continue;
 499                                                                                                 },
 500                                                                                         }
 501                                                                                 }
 502                                                                         };
 503                                                                 }
 504                                                         }
 505
 506                                                         macro_rules! insert_node_id {
 507                                                                 () => {
 508                                                                         match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
 509                                                                                 hash_map::Entry::Occupied(_) => {
 510                                                                                         log_trace!(self, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
 511                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 512                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 513                                                                                 },
 514                                                                                 hash_map::Entry::Vacant(entry) => {
 515                                                                                         log_trace!(self, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
 516                                                                                         entry.insert(peer_descriptor.clone())
 517                                                                                 },
 518                                                                         };
 519                                                                 }
 520                                                         }
 521
 522                                                         let next_step = peer.channel_encryptor.get_noise_step();
 523                                                         match next_step {
 524                                                                 NextNoiseStep::ActOne => {
 525                                                                         let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_keys(&peer.pending_read_buffer[..], &self.our_node_secret, self.get_ephemeral_key())).to_vec();
 526                                                                         peer.pending_outbound_buffer.push_back(act_two);
 527                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 528                                                                 },
 529                                                                 NextNoiseStep::ActTwo => {
 530                                                                         let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
 531                                                                         peer.pending_outbound_buffer.push_back(act_three.to_vec());
 532                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 533                                                                         peer.pending_read_is_header = true;
 534
 535                                                                         peer.their_node_id = Some(their_node_id);
 536                                                                         insert_node_id!();
 537                                                                         let mut features = InitFeatures::supported();
 538                                                                         if self.message_handler.route_handler.should_request_full_sync(&peer.their_node_id.unwrap()) {
 539                                                                                 features.set_initial_routing_sync();
 540                                                                         }
 541
 542                                                                         let resp = msgs::Init { features };
 543                                                                         encode_and_send_msg!(resp);
 544                                                                 },
 545                                                                 NextNoiseStep::ActThree => {
 546                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 547                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 548                                                                         peer.pending_read_is_header = true;
 549                                                                         peer.their_node_id = Some(their_node_id);
 550                                                                         insert_node_id!();
 551                                                                 },
 552                                                                 NextNoiseStep::NoiseComplete => {
 553                                                                         if peer.pending_read_is_header {
 554                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 555                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 556                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 557                                                                                 if msg_len < 2 { // Need at least the message type tag
 558                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 559                                                                                 }
 560                                                                                 peer.pending_read_is_header = false;
 561                                                                         } else {
 562                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 563                                                                                 assert!(msg_data.len() >= 2);
 564
 565                                                                                 // Reset read buffer
 566                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 567                                                                                 peer.pending_read_is_header = true;
 568
 569                                                                                 let mut reader = ::std::io::Cursor::new(&msg_data[..]);
 570                                                                                 let message_result = wire::read(&mut reader);
 571                                                                                 let message = match message_result {
 572                                                                                         Ok(x) => x,
 573                                                                                         Err(e) => {
 574                                                                                                 match e {
 575                                                                                                         msgs::DecodeError::UnknownVersion => return Err(PeerHandleError { no_connection_possible: false }),
 576                                                                                                         msgs::DecodeError::UnknownRequiredFeature => {
 577                                                                                                                 log_debug!(self, "Got a channel/node announcement with an known required feature flag, you may want to update!");
 578                                                                                                                 continue;
 579                                                                                                         }
 580                                                                                                         msgs::DecodeError::InvalidValue => {
 581                                                                                                                 log_debug!(self, "Got an invalid value while deserializing message");
 582                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 583                                                                                                         }
 584                                                                                                         msgs::DecodeError::ShortRead => {
 585                                                                                                                 log_debug!(self, "Deserialization failed due to shortness of message");
 586                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 587                                                                                                         }
 588                                                                                                         msgs::DecodeError::ExtraAddressesPerType => {
 589                                                                                                                 log_debug!(self, "Error decoding message, ignoring due to lnd spec incompatibility. See https://github.com/lightningnetwork/lnd/issues/1407");
 590                                                                                                                 continue;
 591                                                                                                         }
 592                                                                                                         msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError { no_connection_possible: false }),
 593                                                                                                         msgs::DecodeError::Io(_) => return Err(PeerHandleError { no_connection_possible: false }),
 594                                                                                                 }
 595                                                                                         }
 596                                                                                 };
 597
 598                                                                                 log_trace!(self, "Received message of type {} from {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 599
 600                                                                                 // Need an Init as first message
 601                                                                                 if let wire::Message::Init(_) = message {
 602                                                                                 } else if peer.their_features.is_none() {
 603                                                                                         log_trace!(self, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
 604                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 605                                                                                 }
 606
 607                                                                                 match message {
 608                                                                                         // Setup and Control messages:
 609                                                                                         wire::Message::Init(msg) => {
 610                                                                                                 if msg.features.requires_unknown_bits() {
 611                                                                                                         log_info!(self, "Peer global features required unknown version bits");
 612                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 613                                                                                                 }
 614                                                                                                 if msg.features.requires_unknown_bits() {
 615                                                                                                         log_info!(self, "Peer local features required unknown version bits");
 616                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 617                                                                                                 }
 618                                                                                                 if peer.their_features.is_some() {
 619                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 620                                                                                                 }
 621
 622                                                                                                 log_info!(self, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, unkown local flags: {}, unknown global flags: {}",
 623                                                                                                         if msg.features.supports_data_loss_protect() { "supported" } else { "not supported"},
 624                                                                                                         if msg.features.initial_routing_sync() { "requested" } else { "not requested" },
 625                                                                                                         if msg.features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
 626                                                                                                         if msg.features.supports_unknown_bits() { "present" } else { "none" },
 627                                                                                                         if msg.features.supports_unknown_bits() { "present" } else { "none" });
 628
 629                                                                                                 if msg.features.initial_routing_sync() {
 630                                                                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
 631                                                                                                         peers.peers_needing_send.insert(peer_descriptor.clone());
 632                                                                                                 }
 633
 634                                                                                                 if !peer.outbound {
 635                                                                                                         let mut features = InitFeatures::supported();
 636                                                                                                         if self.message_handler.route_handler.should_request_full_sync(&peer.their_node_id.unwrap()) {
 637                                                                                                                 features.set_initial_routing_sync();
 638                                                                                                         }
 639
 640                                                                                                         let resp = msgs::Init { features };
 641                                                                                                         encode_and_send_msg!(resp);
 642                                                                                                 }
 643
 644                                                                                                 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
 645                                                                                                 peer.their_features = Some(msg.features);
 646                                                                                         },
 647                                                                                         wire::Message::Error(msg) => {
 648                                                                                                 let mut data_is_printable = true;
 649                                                                                                 for b in msg.data.bytes() {
 650                                                                                                         if b < 32 || b > 126 {
 651                                                                                                                 data_is_printable = false;
 652                                                                                                                 break;
 653                                                                                                         }
 654                                                                                                 }
 655
 656                                                                                                 if data_is_printable {
 657                                                                                                         log_debug!(self, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
 658                                                                                                 } else {
 659                                                                                                         log_debug!(self, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
 660                                                                                                 }
 661                                                                                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
 662                                                                                                 if msg.channel_id == [0; 32] {
 663                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 664                                                                                                 }
 665                                                                                         },
 666
 667                                                                                         wire::Message::Ping(msg) => {
 668                                                                                                 if msg.ponglen < 65532 {
 669                                                                                                         let resp = msgs::Pong { byteslen: msg.ponglen };
 670                                                                                                         encode_and_send_msg!(resp);
 671                                                                                                 }
 672                                                                                         },
 673                                                                                         wire::Message::Pong(_msg) => {
 674                                                                                                 peer.awaiting_pong = false;
 675                                                                                         },
 676
 677                                                                                         // Channel messages:
 678                                                                                         wire::Message::OpenChannel(msg) => {
 679                                                                                                 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 680                                                                                         },
 681                                                                                         wire::Message::AcceptChannel(msg) => {
 682                                                                                                 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 683                                                                                         },
 684
 685                                                                                         wire::Message::FundingCreated(msg) => {
 686                                                                                                 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
 687                                                                                         },
 688                                                                                         wire::Message::FundingSigned(msg) => {
 689                                                                                                 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
 690                                                                                         },
 691                                                                                         wire::Message::FundingLocked(msg) => {
 692                                                                                                 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
 693                                                                                         },
 694
 695                                                                                         wire::Message::Shutdown(msg) => {
 696                                                                                                 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg);
 697                                                                                         },
 698                                                                                         wire::Message::ClosingSigned(msg) => {
 699                                                                                                 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
 700                                                                                         },
 701
 702                                                                                         // Commitment messages:
 703                                                                                         wire::Message::UpdateAddHTLC(msg) => {
 704                                                                                                 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
 705                                                                                         },
 706                                                                                         wire::Message::UpdateFulfillHTLC(msg) => {
 707                                                                                                 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
 708                                                                                         },
 709                                                                                         wire::Message::UpdateFailHTLC(msg) => {
 710                                                                                                 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
 711                                                                                         },
 712                                                                                         wire::Message::UpdateFailMalformedHTLC(msg) => {
 713                                                                                                 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
 714                                                                                         },
 715
 716                                                                                         wire::Message::CommitmentSigned(msg) => {
 717                                                                                                 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
 718                                                                                         },
 719                                                                                         wire::Message::RevokeAndACK(msg) => {
 720                                                                                                 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
 721                                                                                         },
 722                                                                                         wire::Message::UpdateFee(msg) => {
 723                                                                                                 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
 724                                                                                         },
 725                                                                                         wire::Message::ChannelReestablish(msg) => {
 726                                                                                                 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
 727                                                                                         },
 728
 729                                                                                         // Routing messages:
 730                                                                                         wire::Message::AnnouncementSignatures(msg) => {
 731                                                                                                 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
 732                                                                                         },
 733                                                                                         wire::Message::ChannelAnnouncement(msg) => {
 734                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
 735
 736                                                                                                 if should_forward {
 737                                                                                                         // TODO: forward msg along to all our other peers!
 738                                                                                                 }
 739                                                                                         },
 740                                                                                         wire::Message::NodeAnnouncement(msg) => {
 741                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
 742
 743                                                                                                 if should_forward {
 744                                                                                                         // TODO: forward msg along to all our other peers!
 745                                                                                                 }
 746                                                                                         },
 747                                                                                         wire::Message::ChannelUpdate(msg) => {
 748                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
 749
 750                                                                                                 if should_forward {
 751                                                                                                         // TODO: forward msg along to all our other peers!
 752                                                                                                 }
 753                                                                                         },
 754
 755                                                                                         // Unknown messages:
 756                                                                                         wire::Message::Unknown(msg_type) if msg_type.is_even() => {
 757                                                                                                 // Fail the channel if message is an even, unknown type as per BOLT #1.
 758                                                                                                 return Err(PeerHandleError{ no_connection_possible: true });
 759                                                                                         },
 760                                                                                         wire::Message::Unknown(_) => {},
 761                                                                                 }
 762                                                                         }
 763                                                                 }
 764                                                         }
 765                                                 }
 766                                         }
 767
 768                                         self.do_attempt_write_data(peer_descriptor, peer);
 769
 770                                         peer.pending_outbound_buffer.len() > 10 // pause_read
 771                                 }
 772                         };
 773
 774                         pause_read
 775                 };
 776
 777                 Ok(pause_read)
 778         }
 779
 780         /// Checks for any events generated by our handlers and processes them. Includes sending most
 781         /// response messages as well as messages generated by calls to handler functions directly (eg
 782         /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
 783         pub fn process_events(&self) {
 784                 {
 785                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
 786                         // buffer by doing things like announcing channels on another node. We should be willing to
 787                         // drop optional-ish messages when send buffers get full!
 788
 789                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
 790                         let mut peers_lock = self.peers.lock().unwrap();
 791                         let peers = &mut *peers_lock;
 792                         for event in events_generated.drain(..) {
 793                                 macro_rules! get_peer_for_forwarding {
 794                                         ($node_id: expr, $handle_no_such_peer: block) => {
 795                                                 {
 796                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
 797                                                                 Some(descriptor) => descriptor.clone(),
 798                                                                 None => {
 799                                                                         $handle_no_such_peer;
 800                                                                         continue;
 801                                                                 },
 802                                                         };
 803                                                         match peers.peers.get_mut(&descriptor) {
 804                                                                 Some(peer) => {
 805                                                                         if peer.their_features.is_none() {
 806                                                                                 $handle_no_such_peer;
 807                                                                                 continue;
 808                                                                         }
 809                                                                         (descriptor, peer)
 810                                                                 },
 811                                                                 None => panic!("Inconsistent peers set state!"),
 812                                                         }
 813                                                 }
 814                                         }
 815                                 }
 816                                 match event {
 817                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
 818                                                 log_trace!(self, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
 819                                                                 log_pubkey!(node_id),
 820                                                                 log_bytes!(msg.temporary_channel_id));
 821                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 822                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 823                                                         });
 824                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 825                                                 self.do_attempt_write_data(&mut descriptor, peer);
 826                                         },
 827                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
 828                                                 log_trace!(self, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
 829                                                                 log_pubkey!(node_id),
 830                                                                 log_bytes!(msg.temporary_channel_id));
 831                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 832                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 833                                                         });
 834                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 835                                                 self.do_attempt_write_data(&mut descriptor, peer);
 836                                         },
 837                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
 838                                                 log_trace!(self, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
 839                                                                 log_pubkey!(node_id),
 840                                                                 log_bytes!(msg.temporary_channel_id),
 841                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
 842                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 843                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 844                                                                 //they should just throw away this funding transaction
 845                                                         });
 846                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 847                                                 self.do_attempt_write_data(&mut descriptor, peer);
 848                                         },
 849                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
 850                                                 log_trace!(self, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
 851                                                                 log_pubkey!(node_id),
 852                                                                 log_bytes!(msg.channel_id));
 853                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 854                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 855                                                                 //they should just throw away this funding transaction
 856                                                         });
 857                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 858                                                 self.do_attempt_write_data(&mut descriptor, peer);
 859                                         },
 860                                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
 861                                                 log_trace!(self, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
 862                                                                 log_pubkey!(node_id),
 863                                                                 log_bytes!(msg.channel_id));
 864                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 865                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 866                                                         });
 867                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 868                                                 self.do_attempt_write_data(&mut descriptor, peer);
 869                                         },
 870                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
 871                                                 log_trace!(self, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
 872                                                                 log_pubkey!(node_id),
 873                                                                 log_bytes!(msg.channel_id));
 874                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 875                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 876                                                                 //they should just throw away this funding transaction
 877                                                         });
 878                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 879                                                 self.do_attempt_write_data(&mut descriptor, peer);
 880                                         },
 881                                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
 882                                                 log_trace!(self, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
 883                                                                 log_pubkey!(node_id),
 884                                                                 update_add_htlcs.len(),
 885                                                                 update_fulfill_htlcs.len(),
 886                                                                 update_fail_htlcs.len(),
 887                                                                 log_bytes!(commitment_signed.channel_id));
 888                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 889                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 890                                                         });
 891                                                 for msg in update_add_htlcs {
 892                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 893                                                 }
 894                                                 for msg in update_fulfill_htlcs {
 895                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 896                                                 }
 897                                                 for msg in update_fail_htlcs {
 898                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 899                                                 }
 900                                                 for msg in update_fail_malformed_htlcs {
 901                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 902                                                 }
 903                                                 if let &Some(ref msg) = update_fee {
 904                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 905                                                 }
 906                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed)));
 907                                                 self.do_attempt_write_data(&mut descriptor, peer);
 908                                         },
 909                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 910                                                 log_trace!(self, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
 911                                                                 log_pubkey!(node_id),
 912                                                                 log_bytes!(msg.channel_id));
 913                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 914                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 915                                                         });
 916                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 917                                                 self.do_attempt_write_data(&mut descriptor, peer);
 918                                         },
 919                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
 920                                                 log_trace!(self, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
 921                                                                 log_pubkey!(node_id),
 922                                                                 log_bytes!(msg.channel_id));
 923                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 924                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 925                                                         });
 926                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 927                                                 self.do_attempt_write_data(&mut descriptor, peer);
 928                                         },
 929                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
 930                                                 log_trace!(self, "Handling Shutdown event in peer_handler for node {} for channel {}",
 931                                                                 log_pubkey!(node_id),
 932                                                                 log_bytes!(msg.channel_id));
 933                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 934                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 935                                                         });
 936                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 937                                                 self.do_attempt_write_data(&mut descriptor, peer);
 938                                         },
 939                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 940                                                 log_trace!(self, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
 941                                                                 log_pubkey!(node_id),
 942                                                                 log_bytes!(msg.channel_id));
 943                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 944                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 945                                                         });
 946                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 947                                                 self.do_attempt_write_data(&mut descriptor, peer);
 948                                         },
 949                                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
 950                                                 log_trace!(self, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
 951                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
 952                                                         let encoded_msg = encode_msg!(msg);
 953                                                         let encoded_update_msg = encode_msg!(update_msg);
 954
 955                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 956                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
 957                                                                                 !peer.should_forward_channel(msg.contents.short_channel_id) {
 958                                                                         continue
 959                                                                 }
 960                                                                 match peer.their_node_id {
 961                                                                         None => continue,
 962                                                                         Some(their_node_id) => {
 963                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
 964                                                                                         continue
 965                                                                                 }
 966                                                                         }
 967                                                                 }
 968                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 969                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
 970                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
 971                                                         }
 972                                                 }
 973                                         },
 974                                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
 975                                                 log_trace!(self, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
 976                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
 977                                                         let encoded_msg = encode_msg!(msg);
 978
 979                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 980                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
 981                                                                                 !peer.should_forward_channel(msg.contents.short_channel_id)  {
 982                                                                         continue
 983                                                                 }
 984                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 985                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
 986                                                         }
 987                                                 }
 988                                         },
 989                                         MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
 990                                                 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
 991                                         },
 992                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
 993                                                 match *action {
 994                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
 995                                                                 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
 996                                                                         peers.peers_needing_send.remove(&descriptor);
 997                                                                         if let Some(mut peer) = peers.peers.remove(&descriptor) {
 998                                                                                 if let Some(ref msg) = *msg {
 999                                                                                         log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1000                                                                                                         log_pubkey!(node_id),
1001                                                                                                         msg.data);
1002                                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1003                                                                                         // This isn't guaranteed to work, but if there is enough free
1004                                                                                         // room in the send buffer, put the error message there...
1005                                                                                         self.do_attempt_write_data(&mut descriptor, &mut peer);
1006                                                                                 } else {
1007                                                                                         log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1008                                                                                 }
1009                                                                         }
1010                                                                         descriptor.disconnect_socket();
1011                                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1012                                                                 }
1013                                                         },
1014                                                         msgs::ErrorAction::IgnoreError => {},
1015                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1016                                                                 log_trace!(self, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1017                                                                                 log_pubkey!(node_id),
1018                                                                                 msg.data);
1019                                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1020                                                                         //TODO: Do whatever we're gonna do for handling dropped messages
1021                                                                 });
1022                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1023                                                                 self.do_attempt_write_data(&mut descriptor, peer);
1024                                                         },
1025                                                 }
1026                                         }
1027                                 }
1028                         }
1029
1030                         for mut descriptor in peers.peers_needing_send.drain() {
1031                                 match peers.peers.get_mut(&descriptor) {
1032                                         Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1033                                         None => panic!("Inconsistent peers set state!"),
1034                                 }
1035                         }
1036                 }
1037         }
1038
1039         /// Indicates that the given socket descriptor's connection is now closed.
1040         ///
1041         /// This must only be called if the socket has been disconnected by the peer or your own
1042         /// decision to disconnect it and must NOT be called in any case where other parts of this
1043         /// library (eg PeerHandleError, explicit disconnect_socket calls) instruct you to disconnect
1044         /// the peer.
1045         ///
1046         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1047         pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1048                 self.disconnect_event_internal(descriptor, false);
1049         }
1050
1051         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1052                 let mut peers = self.peers.lock().unwrap();
1053                 peers.peers_needing_send.remove(descriptor);
1054                 let peer_option = peers.peers.remove(descriptor);
1055                 match peer_option {
1056                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1057                         Some(peer) => {
1058                                 match peer.their_node_id {
1059                                         Some(node_id) => {
1060                                                 peers.node_id_to_descriptor.remove(&node_id);
1061                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1062                                         },
1063                                         None => {}
1064                                 }
1065                         }
1066                 };
1067         }
1068
1069         /// This function should be called roughly once every 30 seconds.
1070         /// It will send pings to each peer and disconnect those which did not respond to the last round of pings.
1071
1072         /// Will most likely call send_data on all of the registered descriptors, thus, be very careful with reentrancy issues!
1073         pub fn timer_tick_occured(&self) {
1074                 let mut peers_lock = self.peers.lock().unwrap();
1075                 {
1076                         let peers = &mut *peers_lock;
1077                         let peers_needing_send = &mut peers.peers_needing_send;
1078                         let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1079                         let peers = &mut peers.peers;
1080                         let mut descriptors_needing_disconnect = Vec::new();
1081
1082                         peers.retain(|descriptor, peer| {
1083                                 if peer.awaiting_pong {
1084                                         peers_needing_send.remove(descriptor);
1085                                         descriptors_needing_disconnect.push(descriptor.clone());
1086                                         match peer.their_node_id {
1087                                                 Some(node_id) => {
1088                                                         node_id_to_descriptor.remove(&node_id);
1089                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, true);
1090                                                 }
1091                                                 None => {}
1092                                         }
1093                                         return false;
1094                                 }
1095
1096                                 if !peer.channel_encryptor.is_ready_for_encryption() {
1097                                         // The peer needs to complete its handshake before we can exchange messages
1098                                         return true;
1099                                 }
1100
1101                                 let ping = msgs::Ping {
1102                                         ponglen: 0,
1103                                         byteslen: 64,
1104                                 };
1105                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&ping)));
1106
1107                                 let mut descriptor_clone = descriptor.clone();
1108                                 self.do_attempt_write_data(&mut descriptor_clone, peer);
1109
1110                                 peer.awaiting_pong = true;
1111                                 true
1112                         });
1113
1114                         for mut descriptor in descriptors_needing_disconnect.drain(..) {
1115                                 descriptor.disconnect_socket();
1116                         }
1117                 }
1118         }
1119 }
1120
1121 #[cfg(test)]
1122 mod tests {
1123         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1124         use ln::msgs;
1125         use util::events;
1126         use util::test_utils;
1127         use util::logger::Logger;
1128
1129         use secp256k1::Secp256k1;
1130         use secp256k1::key::{SecretKey, PublicKey};
1131
1132         use rand::{thread_rng, Rng};
1133
1134         use std;
1135         use std::sync::{Arc, Mutex};
1136
1137         #[derive(Clone)]
1138         struct FileDescriptor {
1139                 fd: u16,
1140                 outbound_data: Arc<Mutex<Vec<u8>>>,
1141         }
1142         impl PartialEq for FileDescriptor {
1143                 fn eq(&self, other: &Self) -> bool {
1144                         self.fd == other.fd
1145                 }
1146         }
1147         impl Eq for FileDescriptor { }
1148         impl std::hash::Hash for FileDescriptor {
1149                 fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
1150                         self.fd.hash(hasher)
1151                 }
1152         }
1153
1154         impl SocketDescriptor for FileDescriptor {
1155                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1156                         self.outbound_data.lock().unwrap().extend_from_slice(data);
1157                         data.len()
1158                 }
1159
1160                 fn disconnect_socket(&mut self) {}
1161         }
1162
1163         fn create_chan_handlers(peer_count: usize) -> Vec<test_utils::TestChannelMessageHandler> {
1164                 let mut chan_handlers = Vec::new();
1165                 for _ in 0..peer_count {
1166                         let chan_handler = test_utils::TestChannelMessageHandler::new();
1167                         chan_handlers.push(chan_handler);
1168                 }
1169
1170                 chan_handlers
1171         }
1172
1173         fn create_network<'a>(peer_count: usize, chan_handlers: &'a Vec<test_utils::TestChannelMessageHandler>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler>> {
1174                 let mut peers = Vec::new();
1175                 let mut rng = thread_rng();
1176                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
1177                 let mut ephemeral_bytes = [0; 32];
1178                 rng.fill_bytes(&mut ephemeral_bytes);
1179
1180                 for i in 0..peer_count {
1181                         let router = test_utils::TestRoutingMessageHandler::new();
1182                         let node_id = {
1183                                 let mut key_slice = [0;32];
1184                                 rng.fill_bytes(&mut key_slice);
1185                                 SecretKey::from_slice(&key_slice).unwrap()
1186                         };
1187                         let msg_handler = MessageHandler { chan_handler: &chan_handlers[i], route_handler: Arc::new(router) };
1188                         let peer = PeerManager::new(msg_handler, node_id, &ephemeral_bytes, Arc::clone(&logger));
1189                         peers.push(peer);
1190                 }
1191
1192                 peers
1193         }
1194
1195         fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler>) {
1196                 let secp_ctx = Secp256k1::new();
1197                 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1198                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1199                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1200                 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone()).unwrap();
1201                 peer_a.new_inbound_connection(fd_a.clone()).unwrap();
1202                 assert_eq!(peer_a.read_event(&mut fd_a, initial_data).unwrap(), false);
1203                 assert_eq!(peer_b.read_event(&mut fd_b, fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1204                 assert_eq!(peer_a.read_event(&mut fd_a, fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1205         }
1206
1207         #[test]
1208         fn test_disconnect_peer() {
1209                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1210                 // push a DisconnectPeer event to remove the node flagged by id
1211                 let chan_handlers = create_chan_handlers(2);
1212                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1213                 let mut peers = create_network(2, &chan_handlers);
1214                 establish_connection(&peers[0], &peers[1]);
1215                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1216
1217                 let secp_ctx = Secp256k1::new();
1218                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1219
1220                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1221                         node_id: their_id,
1222                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
1223                 });
1224                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1225                 peers[0].message_handler.chan_handler = &chan_handler;
1226
1227                 peers[0].process_events();
1228                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1229         }
1230         #[test]
1231         fn test_timer_tick_occured(){
1232                 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1233                 let chan_handlers = create_chan_handlers(2);
1234                 let peers = create_network(2, &chan_handlers);
1235                 establish_connection(&peers[0], &peers[1]);
1236                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1237
1238                 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1239                 peers[0].timer_tick_occured();
1240                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1241
1242                 // Since timer_tick_occured() is called again when awaiting_pong is true, all Peers are disconnected
1243                 peers[0].timer_tick_occured();
1244                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1245         }
1246 }