git.bitcoin.ninja Git - rust-lightning/blob - lightning/src/util/ser.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! A very simple serialization framework which is used to serialize/deserialize messages as well
  11 //! as [`ChannelManager`]s and [`ChannelMonitor`]s.
  12 //!
  13 //! [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
  14 //! [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
  15
  16 use crate::prelude::*;
  17 use crate::io::{self, Read, Seek, Write};
  18 use crate::io_extras::{copy, sink};
  19 use core::hash::Hash;
  20 use crate::sync::Mutex;
  21 use core::cmp;
  22 use core::convert::TryFrom;
  23 use core::ops::Deref;
  24
  25 use alloc::collections::BTreeMap;
  26
  27 use bitcoin::secp256k1::{PublicKey, SecretKey};
  28 use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE, SCHNORR_SIGNATURE_SIZE};
  29 use bitcoin::secp256k1::ecdsa;
  30 use bitcoin::secp256k1::schnorr;
  31 use bitcoin::blockdata::constants::ChainHash;
  32 use bitcoin::blockdata::script::{self, Script};
  33 use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
  34 use bitcoin::{consensus, Witness};
  35 use bitcoin::consensus::Encodable;
  36 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
  37 use bitcoin::hash_types::{Txid, BlockHash};
  38 use core::marker::Sized;
  39 use core::time::Duration;
  40 use crate::chain::ClaimId;
  41 use crate::ln::msgs::DecodeError;
  42 #[cfg(taproot)]
  43 use crate::ln::msgs::PartialSignatureWithNonce;
  44 use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
  45
  46 use crate::util::byte_utils::{be48_to_array, slice_to_be48};
  47 use crate::util::string::UntrustedString;
  48
  49 /// serialization buffer size
  50 pub const MAX_BUF_SIZE: usize = 64 * 1024;
  51
  52 /// A simplified version of [`std::io::Write`] that exists largely for backwards compatibility.
  53 /// An impl is provided for any type that also impls [`std::io::Write`].
  54 ///
  55 /// This is not exported to bindings users as we only export serialization to/from byte arrays instead
  56 pub trait Writer {
  57         /// Writes the given buf out. See std::io::Write::write_all for more
  58         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error>;
  59 }
  60
  61 impl<W: Write> Writer for W {
  62         #[inline]
  63         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
  64                 <Self as io::Write>::write_all(self, buf)
  65         }
  66 }
  67
  68 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
  69 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
  70         #[inline]
  71         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
  72                 self.0.write_all(buf)
  73         }
  74         #[inline]
  75         fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
  76                 self.0.write_all(buf)?;
  77                 Ok(buf.len())
  78         }
  79         #[inline]
  80         fn flush(&mut self) -> Result<(), io::Error> {
  81                 Ok(())
  82         }
  83 }
  84
  85 pub(crate) struct VecWriter(pub Vec<u8>);
  86 impl Writer for VecWriter {
  87         #[inline]
  88         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
  89                 self.0.extend_from_slice(buf);
  90                 Ok(())
  91         }
  92 }
  93
  94 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
  95 /// of some data when serialized but don't yet need the full data.
  96 ///
  97 /// This is not exported to bindings users as manual TLV building is not currently supported in bindings
  98 pub struct LengthCalculatingWriter(pub usize);
  99 impl Writer for LengthCalculatingWriter {
 100         #[inline]
 101         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
 102                 self.0 += buf.len();
 103                 Ok(())
 104         }
 105 }
 106
 107 /// Essentially [`std::io::Take`] but a bit simpler and with a method to walk the underlying stream
 108 /// forward to ensure we always consume exactly the fixed length specified.
 109 ///
 110 /// This is not exported to bindings users as manual TLV building is not currently supported in bindings
 111 pub struct FixedLengthReader<R: Read> {
 112         read: R,
 113         bytes_read: u64,
 114         total_bytes: u64,
 115 }
 116 impl<R: Read> FixedLengthReader<R> {
 117         /// Returns a new [`FixedLengthReader`].
 118         pub fn new(read: R, total_bytes: u64) -> Self {
 119                 Self { read, bytes_read: 0, total_bytes }
 120         }
 121
 122         /// Returns whether some bytes are remaining or not.
 123         #[inline]
 124         pub fn bytes_remain(&mut self) -> bool {
 125                 self.bytes_read != self.total_bytes
 126         }
 127
 128         /// Consumes the remaining bytes.
 129         #[inline]
 130         pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
 131                 copy(self, &mut sink()).unwrap();
 132                 if self.bytes_read != self.total_bytes {
 133                         Err(DecodeError::ShortRead)
 134                 } else {
 135                         Ok(())
 136                 }
 137         }
 138 }
 139 impl<R: Read> Read for FixedLengthReader<R> {
 140         #[inline]
 141         fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
 142                 if self.total_bytes == self.bytes_read {
 143                         Ok(0)
 144                 } else {
 145                         let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
 146                         match self.read.read(&mut dest[0..(read_len as usize)]) {
 147                                 Ok(v) => {
 148                                         self.bytes_read += v as u64;
 149                                         Ok(v)
 150                                 },
 151                                 Err(e) => Err(e),
 152                         }
 153                 }
 154         }
 155 }
 156
 157 impl<R: Read> LengthRead for FixedLengthReader<R> {
 158         #[inline]
 159         fn total_bytes(&self) -> u64 {
 160                 self.total_bytes
 161         }
 162 }
 163
 164 /// A [`Read`] implementation which tracks whether any bytes have been read at all. This allows us to distinguish
 165 /// between "EOF reached before we started" and "EOF reached mid-read".
 166 ///
 167 /// This is not exported to bindings users as manual TLV building is not currently supported in bindings
 168 pub struct ReadTrackingReader<R: Read> {
 169         read: R,
 170         /// Returns whether we have read from this reader or not yet.
 171         pub have_read: bool,
 172 }
 173 impl<R: Read> ReadTrackingReader<R> {
 174         /// Returns a new [`ReadTrackingReader`].
 175         pub fn new(read: R) -> Self {
 176                 Self { read, have_read: false }
 177         }
 178 }
 179 impl<R: Read> Read for ReadTrackingReader<R> {
 180         #[inline]
 181         fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
 182                 match self.read.read(dest) {
 183                         Ok(0) => Ok(0),
 184                         Ok(len) => {
 185                                 self.have_read = true;
 186                                 Ok(len)
 187                         },
 188                         Err(e) => Err(e),
 189                 }
 190         }
 191 }
 192
 193 /// A trait that various LDK types implement allowing them to be written out to a [`Writer`].
 194 ///
 195 /// This is not exported to bindings users as we only export serialization to/from byte arrays instead
 196 pub trait Writeable {
 197         /// Writes `self` out to the given [`Writer`].
 198         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error>;
 199
 200         /// Writes `self` out to a `Vec<u8>`.
 201         fn encode(&self) -> Vec<u8> {
 202                 let mut msg = VecWriter(Vec::new());
 203                 self.write(&mut msg).unwrap();
 204                 msg.0
 205         }
 206
 207         /// Writes `self` out to a `Vec<u8>`.
 208         #[cfg(test)]
 209         fn encode_with_len(&self) -> Vec<u8> {
 210                 let mut msg = VecWriter(Vec::new());
 211                 0u16.write(&mut msg).unwrap();
 212                 self.write(&mut msg).unwrap();
 213                 let len = msg.0.len();
 214                 msg.0[..2].copy_from_slice(&(len as u16 - 2).to_be_bytes());
 215                 msg.0
 216         }
 217
 218         /// Gets the length of this object after it has been serialized. This can be overridden to
 219         /// optimize cases where we prepend an object with its length.
 220         // Note that LLVM optimizes this away in most cases! Check that it isn't before you override!
 221         #[inline]
 222         fn serialized_length(&self) -> usize {
 223                 let mut len_calc = LengthCalculatingWriter(0);
 224                 self.write(&mut len_calc).expect("No in-memory data may fail to serialize");
 225                 len_calc.0
 226         }
 227 }
 228
 229 impl<'a, T: Writeable> Writeable for &'a T {
 230         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { (*self).write(writer) }
 231 }
 232
 233 /// A trait that various LDK types implement allowing them to be read in from a [`Read`].
 234 ///
 235 /// This is not exported to bindings users as we only export serialization to/from byte arrays instead
 236 pub trait Readable
 237         where Self: Sized
 238 {
 239         /// Reads a `Self` in from the given [`Read`].
 240         fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError>;
 241 }
 242
 243 /// A trait that various LDK types implement allowing them to be read in from a
 244 /// [`Read`]` + `[`Seek`].
 245 pub(crate) trait SeekReadable where Self: Sized {
 246         /// Reads a `Self` in from the given [`Read`].
 247         fn read<R: Read + Seek>(reader: &mut R) -> Result<Self, DecodeError>;
 248 }
 249
 250 /// A trait that various higher-level LDK types implement allowing them to be read in
 251 /// from a [`Read`] given some additional set of arguments which is required to deserialize.
 252 ///
 253 /// This is not exported to bindings users as we only export serialization to/from byte arrays instead
 254 pub trait ReadableArgs<P>
 255         where Self: Sized
 256 {
 257         /// Reads a `Self` in from the given [`Read`].
 258         fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
 259 }
 260
 261 /// A [`std::io::Read`] that also provides the total bytes available to be read.
 262 pub(crate) trait LengthRead: Read {
 263         /// The total number of bytes available to be read.
 264         fn total_bytes(&self) -> u64;
 265 }
 266
 267 /// A trait that various higher-level LDK types implement allowing them to be read in
 268 /// from a Read given some additional set of arguments which is required to deserialize, requiring
 269 /// the implementer to provide the total length of the read.
 270 pub(crate) trait LengthReadableArgs<P> where Self: Sized
 271 {
 272         /// Reads a `Self` in from the given [`LengthRead`].
 273         fn read<R: LengthRead>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
 274 }
 275
 276 /// A trait that various higher-level LDK types implement allowing them to be read in
 277 /// from a [`Read`], requiring the implementer to provide the total length of the read.
 278 pub(crate) trait LengthReadable where Self: Sized
 279 {
 280         /// Reads a `Self` in from the given [`LengthRead`].
 281         fn read<R: LengthRead>(reader: &mut R) -> Result<Self, DecodeError>;
 282 }
 283
 284 /// A trait that various LDK types implement allowing them to (maybe) be read in from a [`Read`].
 285 ///
 286 /// This is not exported to bindings users as we only export serialization to/from byte arrays instead
 287 pub trait MaybeReadable
 288         where Self: Sized
 289 {
 290         /// Reads a `Self` in from the given [`Read`].
 291         fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
 292 }
 293
 294 impl<T: Readable> MaybeReadable for T {
 295         #[inline]
 296         fn read<R: Read>(reader: &mut R) -> Result<Option<T>, DecodeError> {
 297                 Ok(Some(Readable::read(reader)?))
 298         }
 299 }
 300
 301 /// Wrapper to read a required (non-optional) TLV record.
 302 ///
 303 /// This is not exported to bindings users as manual TLV building is not currently supported in bindings
 304 pub struct RequiredWrapper<T>(pub Option<T>);
 305 impl<T: Readable> Readable for RequiredWrapper<T> {
 306         #[inline]
 307         fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
 308                 Ok(Self(Some(Readable::read(reader)?)))
 309         }
 310 }
 311 impl<A, T: ReadableArgs<A>> ReadableArgs<A> for RequiredWrapper<T> {
 312         #[inline]
 313         fn read<R: Read>(reader: &mut R, args: A) -> Result<Self, DecodeError> {
 314                 Ok(Self(Some(ReadableArgs::read(reader, args)?)))
 315         }
 316 }
 317 /// When handling `default_values`, we want to map the default-value T directly
 318 /// to a `RequiredWrapper<T>` in a way that works for `field: T = t;` as
 319 /// well. Thus, we assume `Into<T> for T` does nothing and use that.
 320 impl<T> From<T> for RequiredWrapper<T> {
 321         fn from(t: T) -> RequiredWrapper<T> { RequiredWrapper(Some(t)) }
 322 }
 323
 324 /// Wrapper to read a required (non-optional) TLV record that may have been upgraded without
 325 /// backwards compat.
 326 ///
 327 /// This is not exported to bindings users as manual TLV building is not currently supported in bindings
 328 pub struct UpgradableRequired<T: MaybeReadable>(pub Option<T>);
 329 impl<T: MaybeReadable> MaybeReadable for UpgradableRequired<T> {
 330         #[inline]
 331         fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError> {
 332                 let tlv = MaybeReadable::read(reader)?;
 333                 if let Some(tlv) = tlv { return Ok(Some(Self(Some(tlv)))) }
 334                 Ok(None)
 335         }
 336 }
 337
 338 pub(crate) struct U48(pub u64);
 339 impl Writeable for U48 {
 340         #[inline]
 341         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 342                 writer.write_all(&be48_to_array(self.0))
 343         }
 344 }
 345 impl Readable for U48 {
 346         #[inline]
 347         fn read<R: Read>(reader: &mut R) -> Result<U48, DecodeError> {
 348                 let mut buf = [0; 6];
 349                 reader.read_exact(&mut buf)?;
 350                 Ok(U48(slice_to_be48(&buf)))
 351         }
 352 }
 353
 354 /// Lightning TLV uses a custom variable-length integer called `BigSize`. It is similar to Bitcoin's
 355 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
 356 ///
 357 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
 358 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
 359 /// you're looking for an example of a variable-length integer to use for your own project, move
 360 /// along, this is a rather poor design.
 361 #[derive(Clone, Copy, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
 362 pub struct BigSize(pub u64);
 363 impl Writeable for BigSize {
 364         #[inline]
 365         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 366                 match self.0 {
 367                         0...0xFC => {
 368                                 (self.0 as u8).write(writer)
 369                         },
 370                         0xFD...0xFFFF => {
 371                                 0xFDu8.write(writer)?;
 372                                 (self.0 as u16).write(writer)
 373                         },
 374                         0x10000...0xFFFFFFFF => {
 375                                 0xFEu8.write(writer)?;
 376                                 (self.0 as u32).write(writer)
 377                         },
 378                         _ => {
 379                                 0xFFu8.write(writer)?;
 380                                 (self.0 as u64).write(writer)
 381                         },
 382                 }
 383         }
 384 }
 385 impl Readable for BigSize {
 386         #[inline]
 387         fn read<R: Read>(reader: &mut R) -> Result<BigSize, DecodeError> {
 388                 let n: u8 = Readable::read(reader)?;
 389                 match n {
 390                         0xFF => {
 391                                 let x: u64 = Readable::read(reader)?;
 392                                 if x < 0x100000000 {
 393                                         Err(DecodeError::InvalidValue)
 394                                 } else {
 395                                         Ok(BigSize(x))
 396                                 }
 397                         }
 398                         0xFE => {
 399                                 let x: u32 = Readable::read(reader)?;
 400                                 if x < 0x10000 {
 401                                         Err(DecodeError::InvalidValue)
 402                                 } else {
 403                                         Ok(BigSize(x as u64))
 404                                 }
 405                         }
 406                         0xFD => {
 407                                 let x: u16 = Readable::read(reader)?;
 408                                 if x < 0xFD {
 409                                         Err(DecodeError::InvalidValue)
 410                                 } else {
 411                                         Ok(BigSize(x as u64))
 412                                 }
 413                         }
 414                         n => Ok(BigSize(n as u64))
 415                 }
 416         }
 417 }
 418
 419 /// The lightning protocol uses u16s for lengths in most cases. As our serialization framework
 420 /// primarily targets that, we must as well. However, because we may serialize objects that have
 421 /// more than 65K entries, we need to be able to store larger values. Thus, we define a variable
 422 /// length integer here that is backwards-compatible for values < 0xffff. We treat 0xffff as
 423 /// "read eight more bytes".
 424 ///
 425 /// To ensure we only have one valid encoding per value, we add 0xffff to values written as eight
 426 /// bytes. Thus, 0xfffe is serialized as 0xfffe, whereas 0xffff is serialized as
 427 /// 0xffff0000000000000000 (i.e. read-eight-bytes then zero).
 428 struct CollectionLength(pub u64);
 429 impl Writeable for CollectionLength {
 430         #[inline]
 431         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 432                 if self.0 < 0xffff {
 433                         (self.0 as u16).write(writer)
 434                 } else {
 435                         0xffffu16.write(writer)?;
 436                         (self.0 - 0xffff).write(writer)
 437                 }
 438         }
 439 }
 440
 441 impl Readable for CollectionLength {
 442         #[inline]
 443         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 444                 let mut val: u64 = <u16 as Readable>::read(r)? as u64;
 445                 if val == 0xffff {
 446                         val = <u64 as Readable>::read(r)?
 447                                 .checked_add(0xffff).ok_or(DecodeError::InvalidValue)?;
 448                 }
 449                 Ok(CollectionLength(val))
 450         }
 451 }
 452
 453 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
 454 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
 455 /// encapsulates such integers implementing [`Readable`]/[`Writeable`] for them.
 456 #[cfg_attr(test, derive(PartialEq, Eq, Debug))]
 457 pub(crate) struct HighZeroBytesDroppedBigSize<T>(pub T);
 458
 459 macro_rules! impl_writeable_primitive {
 460         ($val_type:ty, $len: expr) => {
 461                 impl Writeable for $val_type {
 462                         #[inline]
 463                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 464                                 writer.write_all(&self.to_be_bytes())
 465                         }
 466                 }
 467                 impl Writeable for HighZeroBytesDroppedBigSize<$val_type> {
 468                         #[inline]
 469                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 470                                 // Skip any full leading 0 bytes when writing (in BE):
 471                                 writer.write_all(&self.0.to_be_bytes()[(self.0.leading_zeros()/8) as usize..$len])
 472                         }
 473                 }
 474                 impl Readable for $val_type {
 475                         #[inline]
 476                         fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
 477                                 let mut buf = [0; $len];
 478                                 reader.read_exact(&mut buf)?;
 479                                 Ok(<$val_type>::from_be_bytes(buf))
 480                         }
 481                 }
 482                 impl Readable for HighZeroBytesDroppedBigSize<$val_type> {
 483                         #[inline]
 484                         fn read<R: Read>(reader: &mut R) -> Result<HighZeroBytesDroppedBigSize<$val_type>, DecodeError> {
 485                                 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
 486                                 // the high bytes being dropped. To do so, we start reading into the middle of buf
 487                                 // and then convert the appropriate number of bytes with extra high bytes out of
 488                                 // buf.
 489                                 let mut buf = [0; $len*2];
 490                                 let mut read_len = reader.read(&mut buf[$len..])?;
 491                                 let mut total_read_len = read_len;
 492                                 while read_len != 0 && total_read_len != $len {
 493                                         read_len = reader.read(&mut buf[($len + total_read_len)..])?;
 494                                         total_read_len += read_len;
 495                                 }
 496                                 if total_read_len == 0 || buf[$len] != 0 {
 497                                         let first_byte = $len - ($len - total_read_len);
 498                                         let mut bytes = [0; $len];
 499                                         bytes.copy_from_slice(&buf[first_byte..first_byte + $len]);
 500                                         Ok(HighZeroBytesDroppedBigSize(<$val_type>::from_be_bytes(bytes)))
 501                                 } else {
 502                                         // If the encoding had extra zero bytes, return a failure even though we know
 503                                         // what they meant (as the TLV test vectors require this)
 504                                         Err(DecodeError::InvalidValue)
 505                                 }
 506                         }
 507                 }
 508                 impl From<$val_type> for HighZeroBytesDroppedBigSize<$val_type> {
 509                         fn from(val: $val_type) -> Self { Self(val) }
 510                 }
 511         }
 512 }
 513
 514 impl_writeable_primitive!(u128, 16);
 515 impl_writeable_primitive!(u64, 8);
 516 impl_writeable_primitive!(u32, 4);
 517 impl_writeable_primitive!(u16, 2);
 518 impl_writeable_primitive!(i64, 8);
 519 impl_writeable_primitive!(i32, 4);
 520 impl_writeable_primitive!(i16, 2);
 521 impl_writeable_primitive!(i8, 1);
 522
 523 impl Writeable for u8 {
 524         #[inline]
 525         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 526                 writer.write_all(&[*self])
 527         }
 528 }
 529 impl Readable for u8 {
 530         #[inline]
 531         fn read<R: Read>(reader: &mut R) -> Result<u8, DecodeError> {
 532                 let mut buf = [0; 1];
 533                 reader.read_exact(&mut buf)?;
 534                 Ok(buf[0])
 535         }
 536 }
 537
 538 impl Writeable for bool {
 539         #[inline]
 540         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 541                 writer.write_all(&[if *self {1} else {0}])
 542         }
 543 }
 544 impl Readable for bool {
 545         #[inline]
 546         fn read<R: Read>(reader: &mut R) -> Result<bool, DecodeError> {
 547                 let mut buf = [0; 1];
 548                 reader.read_exact(&mut buf)?;
 549                 if buf[0] != 0 && buf[0] != 1 {
 550                         return Err(DecodeError::InvalidValue);
 551                 }
 552                 Ok(buf[0] == 1)
 553         }
 554 }
 555
 556 macro_rules! impl_array {
 557         ($size:expr, $ty: ty) => (
 558                 impl Writeable for [$ty; $size] {
 559                         #[inline]
 560                         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 561                                 let mut out = [0; $size * core::mem::size_of::<$ty>()];
 562                                 for (idx, v) in self.iter().enumerate() {
 563                                         let startpos = idx * core::mem::size_of::<$ty>();
 564                                         out[startpos..startpos + core::mem::size_of::<$ty>()].copy_from_slice(&v.to_be_bytes());
 565                                 }
 566                                 w.write_all(&out)
 567                         }
 568                 }
 569
 570                 impl Readable for [$ty; $size] {
 571                         #[inline]
 572                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 573                                 let mut buf = [0u8; $size * core::mem::size_of::<$ty>()];
 574                                 r.read_exact(&mut buf)?;
 575                                 let mut res = [0; $size];
 576                                 for (idx, v) in res.iter_mut().enumerate() {
 577                                         let startpos = idx * core::mem::size_of::<$ty>();
 578                                         let mut arr = [0; core::mem::size_of::<$ty>()];
 579                                         arr.copy_from_slice(&buf[startpos..startpos + core::mem::size_of::<$ty>()]);
 580                                         *v = <$ty>::from_be_bytes(arr);
 581                                 }
 582                                 Ok(res)
 583                         }
 584                 }
 585         );
 586 }
 587
 588 impl_array!(3, u8); // for rgb, ISO 4712 code
 589 impl_array!(4, u8); // for IPv4
 590 impl_array!(12, u8); // for OnionV2
 591 impl_array!(16, u8); // for IPv6
 592 impl_array!(32, u8); // for channel id & hmac
 593 impl_array!(PUBLIC_KEY_SIZE, u8); // for PublicKey
 594 impl_array!(64, u8); // for ecdsa::Signature and schnorr::Signature
 595 impl_array!(66, u8); // for MuSig2 nonces
 596 impl_array!(1300, u8); // for OnionPacket.hop_data
 597
 598 impl_array!(8, u16);
 599 impl_array!(32, u16);
 600
 601 /// A type for variable-length values within TLV record where the length is encoded as part of the record.
 602 /// Used to prevent encoding the length twice.
 603 ///
 604 /// This is not exported to bindings users as manual TLV building is not currently supported in bindings
 605 pub struct WithoutLength<T>(pub T);
 606
 607 impl Writeable for WithoutLength<&String> {
 608         #[inline]
 609         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 610                 w.write_all(self.0.as_bytes())
 611         }
 612 }
 613 impl Readable for WithoutLength<String> {
 614         #[inline]
 615         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 616                 let v: WithoutLength<Vec<u8>> = Readable::read(r)?;
 617                 Ok(Self(String::from_utf8(v.0).map_err(|_| DecodeError::InvalidValue)?))
 618         }
 619 }
 620 impl<'a> From<&'a String> for WithoutLength<&'a String> {
 621         fn from(s: &'a String) -> Self { Self(s) }
 622 }
 623
 624
 625 impl Writeable for WithoutLength<&UntrustedString> {
 626         #[inline]
 627         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 628                 WithoutLength(&self.0.0).write(w)
 629         }
 630 }
 631 impl Readable for WithoutLength<UntrustedString> {
 632         #[inline]
 633         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 634                 let s: WithoutLength<String> = Readable::read(r)?;
 635                 Ok(Self(UntrustedString(s.0)))
 636         }
 637 }
 638
 639 impl<'a, T: Writeable> Writeable for WithoutLength<&'a Vec<T>> {
 640         #[inline]
 641         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 642                 for ref v in self.0.iter() {
 643                         v.write(writer)?;
 644                 }
 645                 Ok(())
 646         }
 647 }
 648
 649 impl<T: MaybeReadable> Readable for WithoutLength<Vec<T>> {
 650         #[inline]
 651         fn read<R: Read>(mut reader: &mut R) -> Result<Self, DecodeError> {
 652                 let mut values = Vec::new();
 653                 loop {
 654                         let mut track_read = ReadTrackingReader::new(&mut reader);
 655                         match MaybeReadable::read(&mut track_read) {
 656                                 Ok(Some(v)) => { values.push(v); },
 657                                 Ok(None) => { },
 658                                 // If we failed to read any bytes at all, we reached the end of our TLV
 659                                 // stream and have simply exhausted all entries.
 660                                 Err(ref e) if e == &DecodeError::ShortRead && !track_read.have_read => break,
 661                                 Err(e) => return Err(e),
 662                         }
 663                 }
 664                 Ok(Self(values))
 665         }
 666 }
 667 impl<'a, T> From<&'a Vec<T>> for WithoutLength<&'a Vec<T>> {
 668         fn from(v: &'a Vec<T>) -> Self { Self(v) }
 669 }
 670
 671 impl Writeable for WithoutLength<&Script> {
 672         #[inline]
 673         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 674                 writer.write_all(self.0.as_bytes())
 675         }
 676 }
 677
 678 impl Readable for WithoutLength<Script> {
 679         #[inline]
 680         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 681                 let v: WithoutLength<Vec<u8>> = Readable::read(r)?;
 682                 Ok(WithoutLength(script::Builder::from(v.0).into_script()))
 683         }
 684 }
 685
 686 #[derive(Debug)]
 687 pub(crate) struct Iterable<'a, I: Iterator<Item = &'a T> + Clone, T: 'a>(pub I);
 688
 689 impl<'a, I: Iterator<Item = &'a T> + Clone, T: 'a + Writeable> Writeable for Iterable<'a, I, T> {
 690         #[inline]
 691         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 692                 for ref v in self.0.clone() {
 693                         v.write(writer)?;
 694                 }
 695                 Ok(())
 696         }
 697 }
 698
 699 #[cfg(test)]
 700 impl<'a, I: Iterator<Item = &'a T> + Clone, T: 'a + PartialEq> PartialEq for Iterable<'a, I, T> {
 701         fn eq(&self, other: &Self) -> bool {
 702                 self.0.clone().collect::<Vec<_>>() == other.0.clone().collect::<Vec<_>>()
 703         }
 704 }
 705
 706 macro_rules! impl_for_map {
 707         ($ty: ident, $keybound: ident, $constr: expr) => {
 708                 impl<K, V> Writeable for $ty<K, V>
 709                         where K: Writeable + Eq + $keybound, V: Writeable
 710                 {
 711                         #[inline]
 712                         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 713                                 CollectionLength(self.len() as u64).write(w)?;
 714                                 for (key, value) in self.iter() {
 715                                         key.write(w)?;
 716                                         value.write(w)?;
 717                                 }
 718                                 Ok(())
 719                         }
 720                 }
 721
 722                 impl<K, V> Readable for $ty<K, V>
 723                         where K: Readable + Eq + $keybound, V: MaybeReadable
 724                 {
 725                         #[inline]
 726                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 727                                 let len: CollectionLength = Readable::read(r)?;
 728                                 let mut ret = $constr(len.0 as usize);
 729                                 for _ in 0..len.0 {
 730                                         let k = K::read(r)?;
 731                                         let v_opt = V::read(r)?;
 732                                         if let Some(v) = v_opt {
 733                                                 if ret.insert(k, v).is_some() {
 734                                                         return Err(DecodeError::InvalidValue);
 735                                                 }
 736                                         }
 737                                 }
 738                                 Ok(ret)
 739                         }
 740                 }
 741         }
 742 }
 743
 744 impl_for_map!(BTreeMap, Ord, |_| BTreeMap::new());
 745 impl_for_map!(HashMap, Hash, |len| HashMap::with_capacity(len));
 746
 747 // HashSet
 748 impl<T> Writeable for HashSet<T>
 749 where T: Writeable + Eq + Hash
 750 {
 751         #[inline]
 752         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 753                 CollectionLength(self.len() as u64).write(w)?;
 754                 for item in self.iter() {
 755                         item.write(w)?;
 756                 }
 757                 Ok(())
 758         }
 759 }
 760
 761 impl<T> Readable for HashSet<T>
 762 where T: Readable + Eq + Hash
 763 {
 764         #[inline]
 765         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 766                 let len: CollectionLength = Readable::read(r)?;
 767                 let mut ret = HashSet::with_capacity(cmp::min(len.0 as usize, MAX_BUF_SIZE / core::mem::size_of::<T>()));
 768                 for _ in 0..len.0 {
 769                         if !ret.insert(T::read(r)?) {
 770                                 return Err(DecodeError::InvalidValue)
 771                         }
 772                 }
 773                 Ok(ret)
 774         }
 775 }
 776
 777 // Vectors
 778 macro_rules! impl_writeable_for_vec {
 779         ($ty: ty $(, $name: ident)*) => {
 780                 impl<$($name : Writeable),*> Writeable for Vec<$ty> {
 781                         #[inline]
 782                         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 783                                 CollectionLength(self.len() as u64).write(w)?;
 784                                 for elem in self.iter() {
 785                                         elem.write(w)?;
 786                                 }
 787                                 Ok(())
 788                         }
 789                 }
 790         }
 791 }
 792 macro_rules! impl_readable_for_vec {
 793         ($ty: ty $(, $name: ident)*) => {
 794                 impl<$($name : Readable),*> Readable for Vec<$ty> {
 795                         #[inline]
 796                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 797                                 let len: CollectionLength = Readable::read(r)?;
 798                                 let mut ret = Vec::with_capacity(cmp::min(len.0 as usize, MAX_BUF_SIZE / core::mem::size_of::<$ty>()));
 799                                 for _ in 0..len.0 {
 800                                         if let Some(val) = MaybeReadable::read(r)? {
 801                                                 ret.push(val);
 802                                         }
 803                                 }
 804                                 Ok(ret)
 805                         }
 806                 }
 807         }
 808 }
 809 macro_rules! impl_for_vec {
 810         ($ty: ty $(, $name: ident)*) => {
 811                 impl_writeable_for_vec!($ty $(, $name)*);
 812                 impl_readable_for_vec!($ty $(, $name)*);
 813         }
 814 }
 815
 816 impl Writeable for Vec<u8> {
 817         #[inline]
 818         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 819                 CollectionLength(self.len() as u64).write(w)?;
 820                 w.write_all(&self)
 821         }
 822 }
 823
 824 impl Readable for Vec<u8> {
 825         #[inline]
 826         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 827                 let mut len: CollectionLength = Readable::read(r)?;
 828                 let mut ret = Vec::new();
 829                 while len.0 > 0 {
 830                         let readamt = cmp::min(len.0 as usize, MAX_BUF_SIZE);
 831                         let readstart = ret.len();
 832                         ret.resize(readstart + readamt, 0);
 833                         r.read_exact(&mut ret[readstart..])?;
 834                         len.0 -= readamt as u64;
 835                 }
 836                 Ok(ret)
 837         }
 838 }
 839
 840 impl_for_vec!(ecdsa::Signature);
 841 impl_for_vec!(crate::chain::channelmonitor::ChannelMonitorUpdate);
 842 impl_for_vec!(crate::ln::channelmanager::MonitorUpdateCompletionAction);
 843 impl_for_vec!((A, B), A, B);
 844 impl_writeable_for_vec!(&crate::routing::router::BlindedTail);
 845 impl_readable_for_vec!(crate::routing::router::BlindedTail);
 846
 847 impl Writeable for Vec<Witness> {
 848         #[inline]
 849         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 850                 (self.len() as u16).write(w)?;
 851                 for witness in self {
 852                         (witness.serialized_len() as u16).write(w)?;
 853                         witness.write(w)?;
 854                 }
 855                 Ok(())
 856         }
 857 }
 858
 859 impl Readable for Vec<Witness> {
 860         #[inline]
 861         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 862                 let num_witnesses = <u16 as Readable>::read(r)? as usize;
 863                 let mut witnesses = Vec::with_capacity(num_witnesses);
 864                 for _ in 0..num_witnesses {
 865                         // Even though the length of each witness can be inferred in its consensus-encoded form,
 866                         // the spec includes a length prefix so that implementations don't have to deserialize
 867                         //  each initially. We do that here anyway as in general we'll need to be able to make
 868                         // assertions on some properties of the witnesses when receiving a message providing a list
 869                         // of witnesses. We'll just do a sanity check for the lengths and error if there is a mismatch.
 870                         let witness_len = <u16 as Readable>::read(r)? as usize;
 871                         let witness = <Witness as Readable>::read(r)?;
 872                         if witness.serialized_len() != witness_len {
 873                                 return Err(DecodeError::BadLengthDescriptor);
 874                         }
 875                         witnesses.push(witness);
 876                 }
 877                 Ok(witnesses)
 878         }
 879 }
 880
 881 impl Writeable for Script {
 882         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 883                 (self.len() as u16).write(w)?;
 884                 w.write_all(self.as_bytes())
 885         }
 886 }
 887
 888 impl Readable for Script {
 889         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 890                 let len = <u16 as Readable>::read(r)? as usize;
 891                 let mut buf = vec![0; len];
 892                 r.read_exact(&mut buf)?;
 893                 Ok(Script::from(buf))
 894         }
 895 }
 896
 897 impl Writeable for PublicKey {
 898         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 899                 self.serialize().write(w)
 900         }
 901         #[inline]
 902         fn serialized_length(&self) -> usize {
 903                 PUBLIC_KEY_SIZE
 904         }
 905 }
 906
 907 impl Readable for PublicKey {
 908         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 909                 let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
 910                 match PublicKey::from_slice(&buf) {
 911                         Ok(key) => Ok(key),
 912                         Err(_) => return Err(DecodeError::InvalidValue),
 913                 }
 914         }
 915 }
 916
 917 impl Writeable for SecretKey {
 918         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 919                 let mut ser = [0; SECRET_KEY_SIZE];
 920                 ser.copy_from_slice(&self[..]);
 921                 ser.write(w)
 922         }
 923         #[inline]
 924         fn serialized_length(&self) -> usize {
 925                 SECRET_KEY_SIZE
 926         }
 927 }
 928
 929 impl Readable for SecretKey {
 930         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 931                 let buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
 932                 match SecretKey::from_slice(&buf) {
 933                         Ok(key) => Ok(key),
 934                         Err(_) => return Err(DecodeError::InvalidValue),
 935                 }
 936         }
 937 }
 938
 939 #[cfg(taproot)]
 940 impl Writeable for musig2::types::PublicNonce {
 941         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 942                 self.serialize().write(w)
 943         }
 944 }
 945
 946 #[cfg(taproot)]
 947 impl Readable for musig2::types::PublicNonce {
 948         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 949                 let buf: [u8; PUBLIC_KEY_SIZE * 2] = Readable::read(r)?;
 950                 musig2::types::PublicNonce::from_slice(&buf).map_err(|_| DecodeError::InvalidValue)
 951         }
 952 }
 953
 954 #[cfg(taproot)]
 955 impl Writeable for PartialSignatureWithNonce {
 956         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 957                 self.0.serialize().write(w)?;
 958                 self.1.write(w)
 959         }
 960 }
 961
 962 #[cfg(taproot)]
 963 impl Readable for PartialSignatureWithNonce {
 964         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 965                 let partial_signature_buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
 966                 let partial_signature = musig2::types::PartialSignature::from_slice(&partial_signature_buf).map_err(|_| DecodeError::InvalidValue)?;
 967                 let public_nonce: musig2::types::PublicNonce = Readable::read(r)?;
 968                 Ok(PartialSignatureWithNonce(partial_signature, public_nonce))
 969         }
 970 }
 971
 972 impl Writeable for Sha256dHash {
 973         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 974                 w.write_all(&self[..])
 975         }
 976 }
 977
 978 impl Readable for Sha256dHash {
 979         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 980                 use bitcoin::hashes::Hash;
 981
 982                 let buf: [u8; 32] = Readable::read(r)?;
 983                 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
 984         }
 985 }
 986
 987 impl Writeable for ecdsa::Signature {
 988         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 989                 self.serialize_compact().write(w)
 990         }
 991 }
 992
 993 impl Readable for ecdsa::Signature {
 994         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 995                 let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
 996                 match ecdsa::Signature::from_compact(&buf) {
 997                         Ok(sig) => Ok(sig),
 998                         Err(_) => return Err(DecodeError::InvalidValue),
 999                 }
1000         }
1001 }
1002
1003 impl Writeable for schnorr::Signature {
1004         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1005                 self.as_ref().write(w)
1006         }
1007 }
1008
1009 impl Readable for schnorr::Signature {
1010         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1011                 let buf: [u8; SCHNORR_SIGNATURE_SIZE] = Readable::read(r)?;
1012                 match schnorr::Signature::from_slice(&buf) {
1013                         Ok(sig) => Ok(sig),
1014                         Err(_) => return Err(DecodeError::InvalidValue),
1015                 }
1016         }
1017 }
1018
1019 impl Writeable for PaymentPreimage {
1020         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1021                 self.0.write(w)
1022         }
1023 }
1024
1025 impl Readable for PaymentPreimage {
1026         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1027                 let buf: [u8; 32] = Readable::read(r)?;
1028                 Ok(PaymentPreimage(buf))
1029         }
1030 }
1031
1032 impl Writeable for PaymentHash {
1033         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1034                 self.0.write(w)
1035         }
1036 }
1037
1038 impl Readable for PaymentHash {
1039         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1040                 let buf: [u8; 32] = Readable::read(r)?;
1041                 Ok(PaymentHash(buf))
1042         }
1043 }
1044
1045 impl Writeable for PaymentSecret {
1046         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1047                 self.0.write(w)
1048         }
1049 }
1050
1051 impl Readable for PaymentSecret {
1052         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1053                 let buf: [u8; 32] = Readable::read(r)?;
1054                 Ok(PaymentSecret(buf))
1055         }
1056 }
1057
1058 impl<T: Writeable> Writeable for Box<T> {
1059         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1060                 T::write(&**self, w)
1061         }
1062 }
1063
1064 impl<T: Readable> Readable for Box<T> {
1065         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1066                 Ok(Box::new(Readable::read(r)?))
1067         }
1068 }
1069
1070 impl<T: Writeable> Writeable for Option<T> {
1071         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1072                 match *self {
1073                         None => 0u8.write(w)?,
1074                         Some(ref data) => {
1075                                 BigSize(data.serialized_length() as u64 + 1).write(w)?;
1076                                 data.write(w)?;
1077                         }
1078                 }
1079                 Ok(())
1080         }
1081 }
1082
1083 impl<T: Readable> Readable for Option<T>
1084 {
1085         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1086                 let len: BigSize = Readable::read(r)?;
1087                 match len.0 {
1088                         0 => Ok(None),
1089                         len => {
1090                                 let mut reader = FixedLengthReader::new(r, len - 1);
1091                                 Ok(Some(Readable::read(&mut reader)?))
1092                         }
1093                 }
1094         }
1095 }
1096
1097 impl Writeable for Txid {
1098         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1099                 w.write_all(&self[..])
1100         }
1101 }
1102
1103 impl Readable for Txid {
1104         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1105                 use bitcoin::hashes::Hash;
1106
1107                 let buf: [u8; 32] = Readable::read(r)?;
1108                 Ok(Txid::from_slice(&buf[..]).unwrap())
1109         }
1110 }
1111
1112 impl Writeable for BlockHash {
1113         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1114                 w.write_all(&self[..])
1115         }
1116 }
1117
1118 impl Readable for BlockHash {
1119         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1120                 use bitcoin::hashes::Hash;
1121
1122                 let buf: [u8; 32] = Readable::read(r)?;
1123                 Ok(BlockHash::from_slice(&buf[..]).unwrap())
1124         }
1125 }
1126
1127 impl Writeable for ChainHash {
1128         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1129                 w.write_all(self.as_bytes())
1130         }
1131 }
1132
1133 impl Readable for ChainHash {
1134         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1135                 let buf: [u8; 32] = Readable::read(r)?;
1136                 Ok(ChainHash::from(&buf[..]))
1137         }
1138 }
1139
1140 impl Writeable for OutPoint {
1141         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1142                 self.txid.write(w)?;
1143                 self.vout.write(w)?;
1144                 Ok(())
1145         }
1146 }
1147
1148 impl Readable for OutPoint {
1149         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1150                 let txid = Readable::read(r)?;
1151                 let vout = Readable::read(r)?;
1152                 Ok(OutPoint {
1153                         txid,
1154                         vout,
1155                 })
1156         }
1157 }
1158
1159 macro_rules! impl_consensus_ser {
1160         ($bitcoin_type: ty) => {
1161                 impl Writeable for $bitcoin_type {
1162                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1163                                 match self.consensus_encode(&mut WriterWriteAdaptor(writer)) {
1164                                         Ok(_) => Ok(()),
1165                                         Err(e) => Err(e),
1166                                 }
1167                         }
1168                 }
1169
1170                 impl Readable for $bitcoin_type {
1171                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1172                                 match consensus::encode::Decodable::consensus_decode(r) {
1173                                         Ok(t) => Ok(t),
1174                                         Err(consensus::encode::Error::Io(ref e)) if e.kind() == io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
1175                                         Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
1176                                         Err(_) => Err(DecodeError::InvalidValue),
1177                                 }
1178                         }
1179                 }
1180         }
1181 }
1182 impl_consensus_ser!(Transaction);
1183 impl_consensus_ser!(TxOut);
1184 impl_consensus_ser!(Witness);
1185
1186 impl<T: Readable> Readable for Mutex<T> {
1187         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1188                 let t: T = Readable::read(r)?;
1189                 Ok(Mutex::new(t))
1190         }
1191 }
1192 impl<T: Writeable> Writeable for Mutex<T> {
1193         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1194                 self.lock().unwrap().write(w)
1195         }
1196 }
1197
1198 impl<A: Readable, B: Readable> Readable for (A, B) {
1199         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1200                 let a: A = Readable::read(r)?;
1201                 let b: B = Readable::read(r)?;
1202                 Ok((a, b))
1203         }
1204 }
1205 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
1206         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1207                 self.0.write(w)?;
1208                 self.1.write(w)
1209         }
1210 }
1211
1212 impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
1213         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1214                 let a: A = Readable::read(r)?;
1215                 let b: B = Readable::read(r)?;
1216                 let c: C = Readable::read(r)?;
1217                 Ok((a, b, c))
1218         }
1219 }
1220 impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
1221         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1222                 self.0.write(w)?;
1223                 self.1.write(w)?;
1224                 self.2.write(w)
1225         }
1226 }
1227
1228 impl<A: Readable, B: Readable, C: Readable, D: Readable> Readable for (A, B, C, D) {
1229         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1230                 let a: A = Readable::read(r)?;
1231                 let b: B = Readable::read(r)?;
1232                 let c: C = Readable::read(r)?;
1233                 let d: D = Readable::read(r)?;
1234                 Ok((a, b, c, d))
1235         }
1236 }
1237 impl<A: Writeable, B: Writeable, C: Writeable, D: Writeable> Writeable for (A, B, C, D) {
1238         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1239                 self.0.write(w)?;
1240                 self.1.write(w)?;
1241                 self.2.write(w)?;
1242                 self.3.write(w)
1243         }
1244 }
1245
1246 impl Writeable for () {
1247         fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
1248                 Ok(())
1249         }
1250 }
1251 impl Readable for () {
1252         fn read<R: Read>(_r: &mut R) -> Result<Self, DecodeError> {
1253                 Ok(())
1254         }
1255 }
1256
1257 impl Writeable for String {
1258         #[inline]
1259         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1260                 CollectionLength(self.len() as u64).write(w)?;
1261                 w.write_all(self.as_bytes())
1262         }
1263 }
1264 impl Readable for String {
1265         #[inline]
1266         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1267                 let v: Vec<u8> = Readable::read(r)?;
1268                 let ret = String::from_utf8(v).map_err(|_| DecodeError::InvalidValue)?;
1269                 Ok(ret)
1270         }
1271 }
1272
1273 /// Represents a hostname for serialization purposes.
1274 /// Only the character set and length will be validated.
1275 /// The character set consists of ASCII alphanumeric characters, hyphens, and periods.
1276 /// Its length is guaranteed to be representable by a single byte.
1277 /// This serialization is used by [`BOLT 7`] hostnames.
1278 ///
1279 /// [`BOLT 7`]: https://github.com/lightning/bolts/blob/master/07-routing-gossip.md
1280 #[derive(Clone, Debug, PartialEq, Eq)]
1281 pub struct Hostname(String);
1282 impl Hostname {
1283         /// Returns the length of the hostname.
1284         pub fn len(&self) -> u8 {
1285                 (&self.0).len() as u8
1286         }
1287 }
1288 impl Deref for Hostname {
1289         type Target = String;
1290
1291         fn deref(&self) -> &Self::Target {
1292                 &self.0
1293         }
1294 }
1295 impl From<Hostname> for String {
1296         fn from(hostname: Hostname) -> Self {
1297                 hostname.0
1298         }
1299 }
1300 impl TryFrom<Vec<u8>> for Hostname {
1301         type Error = ();
1302
1303         fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
1304                 if let Ok(s) = String::from_utf8(bytes) {
1305                         Hostname::try_from(s)
1306                 } else {
1307                         Err(())
1308                 }
1309         }
1310 }
1311 impl TryFrom<String> for Hostname {
1312         type Error = ();
1313
1314         fn try_from(s: String) -> Result<Self, Self::Error> {
1315                 if s.len() <= 255 && s.chars().all(|c|
1316                         c.is_ascii_alphanumeric() ||
1317                         c == '.' ||
1318                         c == '-'
1319                 ) {
1320                         Ok(Hostname(s))
1321                 } else {
1322                         Err(())
1323                 }
1324         }
1325 }
1326 impl Writeable for Hostname {
1327         #[inline]
1328         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1329                 self.len().write(w)?;
1330                 w.write_all(self.as_bytes())
1331         }
1332 }
1333 impl Readable for Hostname {
1334         #[inline]
1335         fn read<R: Read>(r: &mut R) -> Result<Hostname, DecodeError> {
1336                 let len: u8 = Readable::read(r)?;
1337                 let mut vec = Vec::with_capacity(len.into());
1338                 vec.resize(len.into(), 0);
1339                 r.read_exact(&mut vec)?;
1340                 Hostname::try_from(vec).map_err(|_| DecodeError::InvalidValue)
1341         }
1342 }
1343
1344 /// This is not exported to bindings users as `Duration`s are simply mapped as ints.
1345 impl Writeable for Duration {
1346         #[inline]
1347         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1348                 self.as_secs().write(w)?;
1349                 self.subsec_nanos().write(w)
1350         }
1351 }
1352 /// This is not exported to bindings users as `Duration`s are simply mapped as ints.
1353 impl Readable for Duration {
1354         #[inline]
1355         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1356                 let secs = Readable::read(r)?;
1357                 let nanos = Readable::read(r)?;
1358                 Ok(Duration::new(secs, nanos))
1359         }
1360 }
1361
1362 /// A wrapper for a `Transaction` which can only be constructed with [`TransactionU16LenLimited::new`]
1363 /// if the `Transaction`'s consensus-serialized length is <= u16::MAX.
1364 ///
1365 /// Use [`TransactionU16LenLimited::into_transaction`] to convert into the contained `Transaction`.
1366 #[derive(Clone, Debug, PartialEq, Eq)]
1367 pub struct TransactionU16LenLimited(Transaction);
1368
1369 impl TransactionU16LenLimited {
1370         /// Constructs a new `TransactionU16LenLimited` from a `Transaction` only if it's consensus-
1371         /// serialized length is <= u16::MAX.
1372         pub fn new(transaction: Transaction) -> Result<Self, ()> {
1373                 if transaction.serialized_length() > (u16::MAX as usize) {
1374                         Err(())
1375                 } else {
1376                         Ok(Self(transaction))
1377                 }
1378         }
1379
1380         /// Consumes this `TransactionU16LenLimited` and returns its contained `Transaction`.
1381         pub fn into_transaction(self) -> Transaction {
1382                 self.0
1383         }
1384 }
1385
1386 impl Writeable for TransactionU16LenLimited {
1387         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1388                 (self.0.serialized_length() as u16).write(w)?;
1389                 self.0.write(w)
1390         }
1391 }
1392
1393 impl Readable for TransactionU16LenLimited {
1394         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1395                 let len = <u16 as Readable>::read(r)?;
1396                 let mut tx_reader = FixedLengthReader::new(r, len as u64);
1397                 let tx: Transaction = Readable::read(&mut tx_reader)?;
1398                 if tx_reader.bytes_remain() {
1399                         Err(DecodeError::BadLengthDescriptor)
1400                 } else {
1401                         Ok(Self(tx))
1402                 }
1403         }
1404 }
1405
1406 impl Writeable for ClaimId {
1407         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1408                 self.0.write(writer)
1409         }
1410 }
1411
1412 impl Readable for ClaimId {
1413         fn read<R: io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
1414                 Ok(Self(Readable::read(reader)?))
1415         }
1416 }
1417
1418 #[cfg(test)]
1419 mod tests {
1420         use core::convert::TryFrom;
1421         use bitcoin::secp256k1::ecdsa;
1422         use crate::util::ser::{Readable, Hostname, Writeable};
1423
1424         #[test]
1425         fn hostname_conversion() {
1426                 assert_eq!(Hostname::try_from(String::from("a-test.com")).unwrap().as_str(), "a-test.com");
1427
1428                 assert!(Hostname::try_from(String::from("\"")).is_err());
1429                 assert!(Hostname::try_from(String::from("$")).is_err());
1430                 assert!(Hostname::try_from(String::from("⚡")).is_err());
1431                 let mut large_vec = Vec::with_capacity(256);
1432                 large_vec.resize(256, b'A');
1433                 assert!(Hostname::try_from(String::from_utf8(large_vec).unwrap()).is_err());
1434         }
1435
1436         #[test]
1437         fn hostname_serialization() {
1438                 let hostname = Hostname::try_from(String::from("test")).unwrap();
1439                 let mut buf: Vec<u8> = Vec::new();
1440                 hostname.write(&mut buf).unwrap();
1441                 assert_eq!(Hostname::read(&mut buf.as_slice()).unwrap().as_str(), "test");
1442         }
1443
1444         #[test]
1445         /// Taproot will likely fill legacy signature fields with all 0s.
1446         /// This test ensures that doing so won't break serialization.
1447         fn null_signature_codec() {
1448                 let buffer = vec![0u8; 64];
1449                 let mut cursor = crate::io::Cursor::new(buffer.clone());
1450                 let signature = ecdsa::Signature::read(&mut cursor).unwrap();
1451                 let serialization = signature.serialize_compact();
1452                 assert_eq!(buffer, serialization.to_vec())
1453         }
1454
1455         #[test]
1456         fn bigsize_encoding_decoding() {
1457                 let values = vec![0, 252, 253, 65535, 65536, 4294967295, 4294967296, 18446744073709551615];
1458                 let bytes = vec![
1459                         "00",
1460                         "fc",
1461                         "fd00fd",
1462                         "fdffff",
1463                         "fe00010000",
1464                         "feffffffff",
1465                         "ff0000000100000000",
1466                         "ffffffffffffffffff"
1467                 ];
1468                 for i in 0..=7 {
1469                         let mut stream = crate::io::Cursor::new(::hex::decode(bytes[i]).unwrap());
1470                         assert_eq!(super::BigSize::read(&mut stream).unwrap().0, values[i]);
1471                         let mut stream = super::VecWriter(Vec::new());
1472                         super::BigSize(values[i]).write(&mut stream).unwrap();
1473                         assert_eq!(stream.0, ::hex::decode(bytes[i]).unwrap());
1474                 }
1475                 let err_bytes = vec![
1476                         "fd00fc",
1477                         "fe0000ffff",
1478                         "ff00000000ffffffff",
1479                         "fd00",
1480                         "feffff",
1481                         "ffffffffff",
1482                         "fd",
1483                         "fe",
1484                         "ff",
1485                         ""
1486                 ];
1487                 for i in 0..=9 {
1488                         let mut stream = crate::io::Cursor::new(::hex::decode(err_bytes[i]).unwrap());
1489                         if i < 3 {
1490                                 assert_eq!(super::BigSize::read(&mut stream).err(), Some(crate::ln::msgs::DecodeError::InvalidValue));
1491                         } else {
1492                                 assert_eq!(super::BigSize::read(&mut stream).err(), Some(crate::ln::msgs::DecodeError::ShortRead));
1493                         }
1494                 }
1495         }
1496 }