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