_ 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 ChannelsManagers and ChannelMonitors.
  12
  13 use crate::prelude::*;
  14 use crate::io::{self, Read, Seek, Write};
  15 use crate::io_extras::{copy, sink};
  16 use core::hash::Hash;
  17 use crate::sync::Mutex;
  18 use core::cmp;
  19 use core::convert::TryFrom;
  20 use core::ops::Deref;
  21
  22 use bitcoin::secp256k1::{PublicKey, SecretKey};
  23 use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE};
  24 use bitcoin::secp256k1::ecdsa::Signature;
  25 use bitcoin::blockdata::constants::ChainHash;
  26 use bitcoin::blockdata::script::Script;
  27 use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
  28 use bitcoin::consensus;
  29 use bitcoin::consensus::Encodable;
  30 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
  31 use bitcoin::hash_types::{Txid, BlockHash};
  32 use core::marker::Sized;
  33 use core::time::Duration;
  34 use crate::ln::msgs::DecodeError;
  35 use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
  36
  37 use crate::util::byte_utils::{be48_to_array, slice_to_be48};
  38
  39 /// serialization buffer size
  40 pub const MAX_BUF_SIZE: usize = 64 * 1024;
  41
  42 /// A simplified version of std::io::Write that exists largely for backwards compatibility.
  43 /// An impl is provided for any type that also impls std::io::Write.
  44 ///
  45 /// (C-not exported) as we only export serialization to/from byte arrays instead
  46 pub trait Writer {
  47         /// Writes the given buf out. See std::io::Write::write_all for more
  48         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error>;
  49 }
  50
  51 impl<W: Write> Writer for W {
  52         #[inline]
  53         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
  54                 <Self as io::Write>::write_all(self, buf)
  55         }
  56 }
  57
  58 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
  59 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
  60         #[inline]
  61         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
  62                 self.0.write_all(buf)
  63         }
  64         #[inline]
  65         fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
  66                 self.0.write_all(buf)?;
  67                 Ok(buf.len())
  68         }
  69         #[inline]
  70         fn flush(&mut self) -> Result<(), io::Error> {
  71                 Ok(())
  72         }
  73 }
  74
  75 pub(crate) struct VecWriter(pub Vec<u8>);
  76 impl Writer for VecWriter {
  77         #[inline]
  78         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
  79                 self.0.extend_from_slice(buf);
  80                 Ok(())
  81         }
  82 }
  83
  84 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
  85 /// of some data when serialized but don't yet need the full data.
  86 pub(crate) struct LengthCalculatingWriter(pub usize);
  87 impl Writer for LengthCalculatingWriter {
  88         #[inline]
  89         fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
  90                 self.0 += buf.len();
  91                 Ok(())
  92         }
  93 }
  94
  95 /// Essentially std::io::Take but a bit simpler and with a method to walk the underlying stream
  96 /// forward to ensure we always consume exactly the fixed length specified.
  97 pub(crate) struct FixedLengthReader<R: Read> {
  98         read: R,
  99         bytes_read: u64,
 100         total_bytes: u64,
 101 }
 102 impl<R: Read> FixedLengthReader<R> {
 103         pub fn new(read: R, total_bytes: u64) -> Self {
 104                 Self { read, bytes_read: 0, total_bytes }
 105         }
 106
 107         #[inline]
 108         pub fn bytes_remain(&mut self) -> bool {
 109                 self.bytes_read != self.total_bytes
 110         }
 111
 112         #[inline]
 113         pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
 114                 copy(self, &mut sink()).unwrap();
 115                 if self.bytes_read != self.total_bytes {
 116                         Err(DecodeError::ShortRead)
 117                 } else {
 118                         Ok(())
 119                 }
 120         }
 121 }
 122 impl<R: Read> Read for FixedLengthReader<R> {
 123         #[inline]
 124         fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
 125                 if self.total_bytes == self.bytes_read {
 126                         Ok(0)
 127                 } else {
 128                         let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
 129                         match self.read.read(&mut dest[0..(read_len as usize)]) {
 130                                 Ok(v) => {
 131                                         self.bytes_read += v as u64;
 132                                         Ok(v)
 133                                 },
 134                                 Err(e) => Err(e),
 135                         }
 136                 }
 137         }
 138 }
 139
 140 impl<R: Read> LengthRead for FixedLengthReader<R> {
 141         #[inline]
 142         fn total_bytes(&self) -> u64 {
 143                 self.total_bytes
 144         }
 145 }
 146
 147 /// A Read which tracks whether any bytes have been read at all. This allows us to distinguish
 148 /// between "EOF reached before we started" and "EOF reached mid-read".
 149 pub(crate) struct ReadTrackingReader<R: Read> {
 150         read: R,
 151         pub have_read: bool,
 152 }
 153 impl<R: Read> ReadTrackingReader<R> {
 154         pub fn new(read: R) -> Self {
 155                 Self { read, have_read: false }
 156         }
 157 }
 158 impl<R: Read> Read for ReadTrackingReader<R> {
 159         #[inline]
 160         fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
 161                 match self.read.read(dest) {
 162                         Ok(0) => Ok(0),
 163                         Ok(len) => {
 164                                 self.have_read = true;
 165                                 Ok(len)
 166                         },
 167                         Err(e) => Err(e),
 168                 }
 169         }
 170 }
 171
 172 /// A trait that various rust-lightning types implement allowing them to be written out to a Writer
 173 ///
 174 /// (C-not exported) as we only export serialization to/from byte arrays instead
 175 pub trait Writeable {
 176         /// Writes self out to the given Writer
 177         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error>;
 178
 179         /// Writes self out to a Vec<u8>
 180         fn encode(&self) -> Vec<u8> {
 181                 let mut msg = VecWriter(Vec::new());
 182                 self.write(&mut msg).unwrap();
 183                 msg.0
 184         }
 185
 186         /// Writes self out to a Vec<u8>
 187         #[cfg(test)]
 188         fn encode_with_len(&self) -> Vec<u8> {
 189                 let mut msg = VecWriter(Vec::new());
 190                 0u16.write(&mut msg).unwrap();
 191                 self.write(&mut msg).unwrap();
 192                 let len = msg.0.len();
 193                 msg.0[..2].copy_from_slice(&(len as u16 - 2).to_be_bytes());
 194                 msg.0
 195         }
 196
 197         /// Gets the length of this object after it has been serialized. This can be overridden to
 198         /// optimize cases where we prepend an object with its length.
 199         // Note that LLVM optimizes this away in most cases! Check that it isn't before you override!
 200         #[inline]
 201         fn serialized_length(&self) -> usize {
 202                 let mut len_calc = LengthCalculatingWriter(0);
 203                 self.write(&mut len_calc).expect("No in-memory data may fail to serialize");
 204                 len_calc.0
 205         }
 206 }
 207
 208 impl<'a, T: Writeable> Writeable for &'a T {
 209         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { (*self).write(writer) }
 210 }
 211
 212 /// A trait that various rust-lightning types implement allowing them to be read in from a Read
 213 ///
 214 /// (C-not exported) as we only export serialization to/from byte arrays instead
 215 pub trait Readable
 216         where Self: Sized
 217 {
 218         /// Reads a Self in from the given Read
 219         fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError>;
 220 }
 221
 222 /// A trait that various rust-lightning types implement allowing them to be read in from a
 223 /// `Read + Seek`.
 224 pub(crate) trait SeekReadable where Self: Sized {
 225         /// Reads a Self in from the given Read
 226         fn read<R: Read + Seek>(reader: &mut R) -> Result<Self, DecodeError>;
 227 }
 228
 229 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
 230 /// from a Read given some additional set of arguments which is required to deserialize.
 231 ///
 232 /// (C-not exported) as we only export serialization to/from byte arrays instead
 233 pub trait ReadableArgs<P>
 234         where Self: Sized
 235 {
 236         /// Reads a Self in from the given Read
 237         fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
 238 }
 239
 240 /// A std::io::Read that also provides the total bytes available to read.
 241 pub(crate) trait LengthRead: Read {
 242         /// The total number of bytes available to read.
 243         fn total_bytes(&self) -> u64;
 244 }
 245
 246 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
 247 /// from a Read given some additional set of arguments which is required to deserialize, requiring
 248 /// the implementer to provide the total length of the read.
 249 pub(crate) trait LengthReadableArgs<P> where Self: Sized
 250 {
 251         /// Reads a Self in from the given LengthRead
 252         fn read<R: LengthRead>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
 253 }
 254
 255 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
 256 /// from a Read, requiring the implementer to provide the total length of the read.
 257 pub(crate) trait LengthReadable where Self: Sized
 258 {
 259         /// Reads a Self in from the given LengthRead
 260         fn read<R: LengthRead>(reader: &mut R) -> Result<Self, DecodeError>;
 261 }
 262
 263 /// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
 264 ///
 265 /// (C-not exported) as we only export serialization to/from byte arrays instead
 266 pub trait MaybeReadable
 267         where Self: Sized
 268 {
 269         /// Reads a Self in from the given Read
 270         fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
 271 }
 272
 273 impl<T: Readable> MaybeReadable for T {
 274         #[inline]
 275         fn read<R: Read>(reader: &mut R) -> Result<Option<T>, DecodeError> {
 276                 Ok(Some(Readable::read(reader)?))
 277         }
 278 }
 279
 280 pub(crate) struct OptionDeserWrapper<T: Readable>(pub Option<T>);
 281 impl<T: Readable> Readable for OptionDeserWrapper<T> {
 282         #[inline]
 283         fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
 284                 Ok(Self(Some(Readable::read(reader)?)))
 285         }
 286 }
 287 /// When handling default_values, we want to map the default-value T directly
 288 /// to a OptionDeserWrapper<T> in a way that works for `field: T = t;` as
 289 /// well. Thus, we assume `Into<T> for T` does nothing and use that.
 290 impl<T: Readable> From<T> for OptionDeserWrapper<T> {
 291         fn from(t: T) -> OptionDeserWrapper<T> { OptionDeserWrapper(Some(t)) }
 292 }
 293
 294 pub(crate) struct U48(pub u64);
 295 impl Writeable for U48 {
 296         #[inline]
 297         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 298                 writer.write_all(&be48_to_array(self.0))
 299         }
 300 }
 301 impl Readable for U48 {
 302         #[inline]
 303         fn read<R: Read>(reader: &mut R) -> Result<U48, DecodeError> {
 304                 let mut buf = [0; 6];
 305                 reader.read_exact(&mut buf)?;
 306                 Ok(U48(slice_to_be48(&buf)))
 307         }
 308 }
 309
 310 /// Lightning TLV uses a custom variable-length integer called BigSize. It is similar to Bitcoin's
 311 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
 312 ///
 313 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
 314 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
 315 /// you're looking for an example of a variable-length integer to use for your own project, move
 316 /// along, this is a rather poor design.
 317 pub struct BigSize(pub u64);
 318 impl Writeable for BigSize {
 319         #[inline]
 320         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 321                 match self.0 {
 322                         0...0xFC => {
 323                                 (self.0 as u8).write(writer)
 324                         },
 325                         0xFD...0xFFFF => {
 326                                 0xFDu8.write(writer)?;
 327                                 (self.0 as u16).write(writer)
 328                         },
 329                         0x10000...0xFFFFFFFF => {
 330                                 0xFEu8.write(writer)?;
 331                                 (self.0 as u32).write(writer)
 332                         },
 333                         _ => {
 334                                 0xFFu8.write(writer)?;
 335                                 (self.0 as u64).write(writer)
 336                         },
 337                 }
 338         }
 339 }
 340 impl Readable for BigSize {
 341         #[inline]
 342         fn read<R: Read>(reader: &mut R) -> Result<BigSize, DecodeError> {
 343                 let n: u8 = Readable::read(reader)?;
 344                 match n {
 345                         0xFF => {
 346                                 let x: u64 = Readable::read(reader)?;
 347                                 if x < 0x100000000 {
 348                                         Err(DecodeError::InvalidValue)
 349                                 } else {
 350                                         Ok(BigSize(x))
 351                                 }
 352                         }
 353                         0xFE => {
 354                                 let x: u32 = Readable::read(reader)?;
 355                                 if x < 0x10000 {
 356                                         Err(DecodeError::InvalidValue)
 357                                 } else {
 358                                         Ok(BigSize(x as u64))
 359                                 }
 360                         }
 361                         0xFD => {
 362                                 let x: u16 = Readable::read(reader)?;
 363                                 if x < 0xFD {
 364                                         Err(DecodeError::InvalidValue)
 365                                 } else {
 366                                         Ok(BigSize(x as u64))
 367                                 }
 368                         }
 369                         n => Ok(BigSize(n as u64))
 370                 }
 371         }
 372 }
 373
 374 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
 375 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
 376 /// encapsulates such integers implementing Readable/Writeable for them.
 377 #[cfg_attr(test, derive(PartialEq, Eq, Debug))]
 378 pub(crate) struct HighZeroBytesDroppedBigSize<T>(pub T);
 379
 380 macro_rules! impl_writeable_primitive {
 381         ($val_type:ty, $len: expr) => {
 382                 impl Writeable for $val_type {
 383                         #[inline]
 384                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 385                                 writer.write_all(&self.to_be_bytes())
 386                         }
 387                 }
 388                 impl Writeable for HighZeroBytesDroppedBigSize<$val_type> {
 389                         #[inline]
 390                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 391                                 // Skip any full leading 0 bytes when writing (in BE):
 392                                 writer.write_all(&self.0.to_be_bytes()[(self.0.leading_zeros()/8) as usize..$len])
 393                         }
 394                 }
 395                 impl Readable for $val_type {
 396                         #[inline]
 397                         fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
 398                                 let mut buf = [0; $len];
 399                                 reader.read_exact(&mut buf)?;
 400                                 Ok(<$val_type>::from_be_bytes(buf))
 401                         }
 402                 }
 403                 impl Readable for HighZeroBytesDroppedBigSize<$val_type> {
 404                         #[inline]
 405                         fn read<R: Read>(reader: &mut R) -> Result<HighZeroBytesDroppedBigSize<$val_type>, DecodeError> {
 406                                 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
 407                                 // the high bytes being dropped. To do so, we start reading into the middle of buf
 408                                 // and then convert the appropriate number of bytes with extra high bytes out of
 409                                 // buf.
 410                                 let mut buf = [0; $len*2];
 411                                 let mut read_len = reader.read(&mut buf[$len..])?;
 412                                 let mut total_read_len = read_len;
 413                                 while read_len != 0 && total_read_len != $len {
 414                                         read_len = reader.read(&mut buf[($len + total_read_len)..])?;
 415                                         total_read_len += read_len;
 416                                 }
 417                                 if total_read_len == 0 || buf[$len] != 0 {
 418                                         let first_byte = $len - ($len - total_read_len);
 419                                         let mut bytes = [0; $len];
 420                                         bytes.copy_from_slice(&buf[first_byte..first_byte + $len]);
 421                                         Ok(HighZeroBytesDroppedBigSize(<$val_type>::from_be_bytes(bytes)))
 422                                 } else {
 423                                         // If the encoding had extra zero bytes, return a failure even though we know
 424                                         // what they meant (as the TLV test vectors require this)
 425                                         Err(DecodeError::InvalidValue)
 426                                 }
 427                         }
 428                 }
 429                 impl From<$val_type> for HighZeroBytesDroppedBigSize<$val_type> {
 430                         fn from(val: $val_type) -> Self { Self(val) }
 431                 }
 432         }
 433 }
 434
 435 impl_writeable_primitive!(u128, 16);
 436 impl_writeable_primitive!(u64, 8);
 437 impl_writeable_primitive!(u32, 4);
 438 impl_writeable_primitive!(u16, 2);
 439
 440 impl Writeable for u8 {
 441         #[inline]
 442         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 443                 writer.write_all(&[*self])
 444         }
 445 }
 446 impl Readable for u8 {
 447         #[inline]
 448         fn read<R: Read>(reader: &mut R) -> Result<u8, DecodeError> {
 449                 let mut buf = [0; 1];
 450                 reader.read_exact(&mut buf)?;
 451                 Ok(buf[0])
 452         }
 453 }
 454
 455 impl Writeable for bool {
 456         #[inline]
 457         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 458                 writer.write_all(&[if *self {1} else {0}])
 459         }
 460 }
 461 impl Readable for bool {
 462         #[inline]
 463         fn read<R: Read>(reader: &mut R) -> Result<bool, DecodeError> {
 464                 let mut buf = [0; 1];
 465                 reader.read_exact(&mut buf)?;
 466                 if buf[0] != 0 && buf[0] != 1 {
 467                         return Err(DecodeError::InvalidValue);
 468                 }
 469                 Ok(buf[0] == 1)
 470         }
 471 }
 472
 473 // u8 arrays
 474 macro_rules! impl_array {
 475         ( $size:expr ) => (
 476                 impl Writeable for [u8; $size]
 477                 {
 478                         #[inline]
 479                         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 480                                 w.write_all(self)
 481                         }
 482                 }
 483
 484                 impl Readable for [u8; $size]
 485                 {
 486                         #[inline]
 487                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 488                                 let mut buf = [0u8; $size];
 489                                 r.read_exact(&mut buf)?;
 490                                 Ok(buf)
 491                         }
 492                 }
 493         );
 494 }
 495
 496 impl_array!(3); // for rgb, ISO 4712 code
 497 impl_array!(4); // for IPv4
 498 impl_array!(12); // for OnionV2
 499 impl_array!(16); // for IPv6
 500 impl_array!(32); // for channel id & hmac
 501 impl_array!(PUBLIC_KEY_SIZE); // for PublicKey
 502 impl_array!(COMPACT_SIGNATURE_SIZE); // for Signature
 503 impl_array!(1300); // for OnionPacket.hop_data
 504
 505 impl Writeable for [u16; 8] {
 506         #[inline]
 507         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 508                 for v in self.iter() {
 509                         w.write_all(&v.to_be_bytes())?
 510                 }
 511                 Ok(())
 512         }
 513 }
 514
 515 impl Readable for [u16; 8] {
 516         #[inline]
 517         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 518                 let mut buf = [0u8; 16];
 519                 r.read_exact(&mut buf)?;
 520                 let mut res = [0u16; 8];
 521                 for (idx, v) in res.iter_mut().enumerate() {
 522                         *v = (buf[idx] as u16) << 8 | (buf[idx + 1] as u16)
 523                 }
 524                 Ok(res)
 525         }
 526 }
 527
 528 /// For variable-length values within TLV record where the length is encoded as part of the record.
 529 /// Used to prevent encoding the length twice.
 530 pub(crate) struct WithoutLength<T>(pub T);
 531
 532 impl Writeable for WithoutLength<&String> {
 533         #[inline]
 534         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 535                 w.write_all(self.0.as_bytes())
 536         }
 537 }
 538 impl Readable for WithoutLength<String> {
 539         #[inline]
 540         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 541                 let v: WithoutLength<Vec<u8>> = Readable::read(r)?;
 542                 Ok(Self(String::from_utf8(v.0).map_err(|_| DecodeError::InvalidValue)?))
 543         }
 544 }
 545 impl<'a> From<&'a String> for WithoutLength<&'a String> {
 546         fn from(s: &'a String) -> Self { Self(s) }
 547 }
 548
 549 impl<'a, T: Writeable> Writeable for WithoutLength<&'a Vec<T>> {
 550         #[inline]
 551         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 552                 for ref v in self.0.iter() {
 553                         v.write(writer)?;
 554                 }
 555                 Ok(())
 556         }
 557 }
 558
 559 impl<T: MaybeReadable> Readable for WithoutLength<Vec<T>> {
 560         #[inline]
 561         fn read<R: Read>(mut reader: &mut R) -> Result<Self, DecodeError> {
 562                 let mut values = Vec::new();
 563                 loop {
 564                         let mut track_read = ReadTrackingReader::new(&mut reader);
 565                         match MaybeReadable::read(&mut track_read) {
 566                                 Ok(Some(v)) => { values.push(v); },
 567                                 Ok(None) => { },
 568                                 // If we failed to read any bytes at all, we reached the end of our TLV
 569                                 // stream and have simply exhausted all entries.
 570                                 Err(ref e) if e == &DecodeError::ShortRead && !track_read.have_read => break,
 571                                 Err(e) => return Err(e),
 572                         }
 573                 }
 574                 Ok(Self(values))
 575         }
 576 }
 577 impl<'a, T> From<&'a Vec<T>> for WithoutLength<&'a Vec<T>> {
 578         fn from(v: &'a Vec<T>) -> Self { Self(v) }
 579 }
 580
 581 // HashMap
 582 impl<K, V> Writeable for HashMap<K, V>
 583         where K: Writeable + Eq + Hash,
 584               V: Writeable
 585 {
 586         #[inline]
 587         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 588         (self.len() as u16).write(w)?;
 589                 for (key, value) in self.iter() {
 590                         key.write(w)?;
 591                         value.write(w)?;
 592                 }
 593                 Ok(())
 594         }
 595 }
 596
 597 impl<K, V> Readable for HashMap<K, V>
 598         where K: Readable + Eq + Hash,
 599               V: MaybeReadable
 600 {
 601         #[inline]
 602         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 603                 let len: u16 = Readable::read(r)?;
 604                 let mut ret = HashMap::with_capacity(len as usize);
 605                 for _ in 0..len {
 606                         let k = K::read(r)?;
 607                         let v_opt = V::read(r)?;
 608                         if let Some(v) = v_opt {
 609                                 if ret.insert(k, v).is_some() {
 610                                         return Err(DecodeError::InvalidValue);
 611                                 }
 612                         }
 613                 }
 614                 Ok(ret)
 615         }
 616 }
 617
 618 // HashSet
 619 impl<T> Writeable for HashSet<T>
 620 where T: Writeable + Eq + Hash
 621 {
 622         #[inline]
 623         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 624                 (self.len() as u16).write(w)?;
 625                 for item in self.iter() {
 626                         item.write(w)?;
 627                 }
 628                 Ok(())
 629         }
 630 }
 631
 632 impl<T> Readable for HashSet<T>
 633 where T: Readable + Eq + Hash
 634 {
 635         #[inline]
 636         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 637                 let len: u16 = Readable::read(r)?;
 638                 let mut ret = HashSet::with_capacity(len as usize);
 639                 for _ in 0..len {
 640                         if !ret.insert(T::read(r)?) {
 641                                 return Err(DecodeError::InvalidValue)
 642                         }
 643                 }
 644                 Ok(ret)
 645         }
 646 }
 647
 648 // Vectors
 649 impl Writeable for Vec<u8> {
 650         #[inline]
 651         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 652                 (self.len() as u16).write(w)?;
 653                 w.write_all(&self)
 654         }
 655 }
 656
 657 impl Readable for Vec<u8> {
 658         #[inline]
 659         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 660                 let len: u16 = Readable::read(r)?;
 661                 let mut ret = Vec::with_capacity(len as usize);
 662                 ret.resize(len as usize, 0);
 663                 r.read_exact(&mut ret)?;
 664                 Ok(ret)
 665         }
 666 }
 667 impl Writeable for Vec<Signature> {
 668         #[inline]
 669         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 670                 (self.len() as u16).write(w)?;
 671                 for e in self.iter() {
 672                         e.write(w)?;
 673                 }
 674                 Ok(())
 675         }
 676 }
 677
 678 impl Readable for Vec<Signature> {
 679         #[inline]
 680         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 681                 let len: u16 = Readable::read(r)?;
 682                 let byte_size = (len as usize)
 683                                 .checked_mul(COMPACT_SIGNATURE_SIZE)
 684                                 .ok_or(DecodeError::BadLengthDescriptor)?;
 685                 if byte_size > MAX_BUF_SIZE {
 686                         return Err(DecodeError::BadLengthDescriptor);
 687                 }
 688                 let mut ret = Vec::with_capacity(len as usize);
 689                 for _ in 0..len { ret.push(Readable::read(r)?); }
 690                 Ok(ret)
 691         }
 692 }
 693
 694 impl Writeable for Script {
 695         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 696                 (self.len() as u16).write(w)?;
 697                 w.write_all(self.as_bytes())
 698         }
 699 }
 700
 701 impl Readable for Script {
 702         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 703                 let len = <u16 as Readable>::read(r)? as usize;
 704                 let mut buf = vec![0; len];
 705                 r.read_exact(&mut buf)?;
 706                 Ok(Script::from(buf))
 707         }
 708 }
 709
 710 impl Writeable for PublicKey {
 711         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 712                 self.serialize().write(w)
 713         }
 714         #[inline]
 715         fn serialized_length(&self) -> usize {
 716                 PUBLIC_KEY_SIZE
 717         }
 718 }
 719
 720 impl Readable for PublicKey {
 721         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 722                 let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
 723                 match PublicKey::from_slice(&buf) {
 724                         Ok(key) => Ok(key),
 725                         Err(_) => return Err(DecodeError::InvalidValue),
 726                 }
 727         }
 728 }
 729
 730 impl Writeable for SecretKey {
 731         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 732                 let mut ser = [0; SECRET_KEY_SIZE];
 733                 ser.copy_from_slice(&self[..]);
 734                 ser.write(w)
 735         }
 736         #[inline]
 737         fn serialized_length(&self) -> usize {
 738                 SECRET_KEY_SIZE
 739         }
 740 }
 741
 742 impl Readable for SecretKey {
 743         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 744                 let buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
 745                 match SecretKey::from_slice(&buf) {
 746                         Ok(key) => Ok(key),
 747                         Err(_) => return Err(DecodeError::InvalidValue),
 748                 }
 749         }
 750 }
 751
 752 impl Writeable for Sha256dHash {
 753         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 754                 w.write_all(&self[..])
 755         }
 756 }
 757
 758 impl Readable for Sha256dHash {
 759         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 760                 use bitcoin::hashes::Hash;
 761
 762                 let buf: [u8; 32] = Readable::read(r)?;
 763                 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
 764         }
 765 }
 766
 767 impl Writeable for Signature {
 768         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 769                 self.serialize_compact().write(w)
 770         }
 771         #[inline]
 772         fn serialized_length(&self) -> usize {
 773                 COMPACT_SIGNATURE_SIZE
 774         }
 775 }
 776
 777 impl Readable for Signature {
 778         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 779                 let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
 780                 match Signature::from_compact(&buf) {
 781                         Ok(sig) => Ok(sig),
 782                         Err(_) => return Err(DecodeError::InvalidValue),
 783                 }
 784         }
 785 }
 786
 787 impl Writeable for PaymentPreimage {
 788         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 789                 self.0.write(w)
 790         }
 791 }
 792
 793 impl Readable for PaymentPreimage {
 794         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 795                 let buf: [u8; 32] = Readable::read(r)?;
 796                 Ok(PaymentPreimage(buf))
 797         }
 798 }
 799
 800 impl Writeable for PaymentHash {
 801         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 802                 self.0.write(w)
 803         }
 804 }
 805
 806 impl Readable for PaymentHash {
 807         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 808                 let buf: [u8; 32] = Readable::read(r)?;
 809                 Ok(PaymentHash(buf))
 810         }
 811 }
 812
 813 impl Writeable for PaymentSecret {
 814         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 815                 self.0.write(w)
 816         }
 817 }
 818
 819 impl Readable for PaymentSecret {
 820         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 821                 let buf: [u8; 32] = Readable::read(r)?;
 822                 Ok(PaymentSecret(buf))
 823         }
 824 }
 825
 826 impl<T: Writeable> Writeable for Box<T> {
 827         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 828                 T::write(&**self, w)
 829         }
 830 }
 831
 832 impl<T: Readable> Readable for Box<T> {
 833         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 834                 Ok(Box::new(Readable::read(r)?))
 835         }
 836 }
 837
 838 impl<T: Writeable> Writeable for Option<T> {
 839         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 840                 match *self {
 841                         None => 0u8.write(w)?,
 842                         Some(ref data) => {
 843                                 BigSize(data.serialized_length() as u64 + 1).write(w)?;
 844                                 data.write(w)?;
 845                         }
 846                 }
 847                 Ok(())
 848         }
 849 }
 850
 851 impl<T: Readable> Readable for Option<T>
 852 {
 853         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 854                 let len: BigSize = Readable::read(r)?;
 855                 match len.0 {
 856                         0 => Ok(None),
 857                         len => {
 858                                 let mut reader = FixedLengthReader::new(r, len - 1);
 859                                 Ok(Some(Readable::read(&mut reader)?))
 860                         }
 861                 }
 862         }
 863 }
 864
 865 impl Writeable for Txid {
 866         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 867                 w.write_all(&self[..])
 868         }
 869 }
 870
 871 impl Readable for Txid {
 872         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 873                 use bitcoin::hashes::Hash;
 874
 875                 let buf: [u8; 32] = Readable::read(r)?;
 876                 Ok(Txid::from_slice(&buf[..]).unwrap())
 877         }
 878 }
 879
 880 impl Writeable for BlockHash {
 881         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 882                 w.write_all(&self[..])
 883         }
 884 }
 885
 886 impl Readable for BlockHash {
 887         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 888                 use bitcoin::hashes::Hash;
 889
 890                 let buf: [u8; 32] = Readable::read(r)?;
 891                 Ok(BlockHash::from_slice(&buf[..]).unwrap())
 892         }
 893 }
 894
 895 impl Writeable for ChainHash {
 896         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 897                 w.write_all(self.as_bytes())
 898         }
 899 }
 900
 901 impl Readable for ChainHash {
 902         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 903                 let buf: [u8; 32] = Readable::read(r)?;
 904                 Ok(ChainHash::from(&buf[..]))
 905         }
 906 }
 907
 908 impl Writeable for OutPoint {
 909         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 910                 self.txid.write(w)?;
 911                 self.vout.write(w)?;
 912                 Ok(())
 913         }
 914 }
 915
 916 impl Readable for OutPoint {
 917         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 918                 let txid = Readable::read(r)?;
 919                 let vout = Readable::read(r)?;
 920                 Ok(OutPoint {
 921                         txid,
 922                         vout,
 923                 })
 924         }
 925 }
 926
 927 macro_rules! impl_consensus_ser {
 928         ($bitcoin_type: ty) => {
 929                 impl Writeable for $bitcoin_type {
 930                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 931                                 match self.consensus_encode(&mut WriterWriteAdaptor(writer)) {
 932                                         Ok(_) => Ok(()),
 933                                         Err(e) => Err(e),
 934                                 }
 935                         }
 936                 }
 937
 938                 impl Readable for $bitcoin_type {
 939                         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 940                                 match consensus::encode::Decodable::consensus_decode(r) {
 941                                         Ok(t) => Ok(t),
 942                                         Err(consensus::encode::Error::Io(ref e)) if e.kind() == io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
 943                                         Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
 944                                         Err(_) => Err(DecodeError::InvalidValue),
 945                                 }
 946                         }
 947                 }
 948         }
 949 }
 950 impl_consensus_ser!(Transaction);
 951 impl_consensus_ser!(TxOut);
 952
 953 impl<T: Readable> Readable for Mutex<T> {
 954         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 955                 let t: T = Readable::read(r)?;
 956                 Ok(Mutex::new(t))
 957         }
 958 }
 959 impl<T: Writeable> Writeable for Mutex<T> {
 960         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 961                 self.lock().unwrap().write(w)
 962         }
 963 }
 964
 965 impl<A: Readable, B: Readable> Readable for (A, B) {
 966         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 967                 let a: A = Readable::read(r)?;
 968                 let b: B = Readable::read(r)?;
 969                 Ok((a, b))
 970         }
 971 }
 972 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
 973         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 974                 self.0.write(w)?;
 975                 self.1.write(w)
 976         }
 977 }
 978
 979 impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
 980         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 981                 let a: A = Readable::read(r)?;
 982                 let b: B = Readable::read(r)?;
 983                 let c: C = Readable::read(r)?;
 984                 Ok((a, b, c))
 985         }
 986 }
 987 impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
 988         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 989                 self.0.write(w)?;
 990                 self.1.write(w)?;
 991                 self.2.write(w)
 992         }
 993 }
 994
 995 impl Writeable for () {
 996         fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
 997                 Ok(())
 998         }
 999 }
1000 impl Readable for () {
1001         fn read<R: Read>(_r: &mut R) -> Result<Self, DecodeError> {
1002                 Ok(())
1003         }
1004 }
1005
1006 impl Writeable for String {
1007         #[inline]
1008         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1009                 (self.len() as u16).write(w)?;
1010                 w.write_all(self.as_bytes())
1011         }
1012 }
1013 impl Readable for String {
1014         #[inline]
1015         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1016                 let v: Vec<u8> = Readable::read(r)?;
1017                 let ret = String::from_utf8(v).map_err(|_| DecodeError::InvalidValue)?;
1018                 Ok(ret)
1019         }
1020 }
1021
1022 /// Represents a hostname for serialization purposes.
1023 /// Only the character set and length will be validated.
1024 /// The character set consists of ASCII alphanumeric characters, hyphens, and periods.
1025 /// Its length is guaranteed to be representable by a single byte.
1026 /// This serialization is used by BOLT 7 hostnames.
1027 #[derive(Clone, Debug, PartialEq, Eq)]
1028 pub struct Hostname(String);
1029 impl Hostname {
1030         /// Returns the length of the hostname.
1031         pub fn len(&self) -> u8 {
1032                 (&self.0).len() as u8
1033         }
1034 }
1035 impl Deref for Hostname {
1036         type Target = String;
1037
1038         fn deref(&self) -> &Self::Target {
1039                 &self.0
1040         }
1041 }
1042 impl From<Hostname> for String {
1043         fn from(hostname: Hostname) -> Self {
1044                 hostname.0
1045         }
1046 }
1047 impl TryFrom<Vec<u8>> for Hostname {
1048         type Error = ();
1049
1050         fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
1051                 if let Ok(s) = String::from_utf8(bytes) {
1052                         Hostname::try_from(s)
1053                 } else {
1054                         Err(())
1055                 }
1056         }
1057 }
1058 impl TryFrom<String> for Hostname {
1059         type Error = ();
1060
1061         fn try_from(s: String) -> Result<Self, Self::Error> {
1062                 if s.len() <= 255 && s.chars().all(|c|
1063                         c.is_ascii_alphanumeric() ||
1064                         c == '.' ||
1065                         c == '-'
1066                 ) {
1067                         Ok(Hostname(s))
1068                 } else {
1069                         Err(())
1070                 }
1071         }
1072 }
1073 impl Writeable for Hostname {
1074         #[inline]
1075         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1076                 self.len().write(w)?;
1077                 w.write_all(self.as_bytes())
1078         }
1079 }
1080 impl Readable for Hostname {
1081         #[inline]
1082         fn read<R: Read>(r: &mut R) -> Result<Hostname, DecodeError> {
1083                 let len: u8 = Readable::read(r)?;
1084                 let mut vec = Vec::with_capacity(len.into());
1085                 vec.resize(len.into(), 0);
1086                 r.read_exact(&mut vec)?;
1087                 Hostname::try_from(vec).map_err(|_| DecodeError::InvalidValue)
1088         }
1089 }
1090
1091 impl Writeable for Duration {
1092         #[inline]
1093         fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1094                 self.as_secs().write(w)?;
1095                 self.subsec_nanos().write(w)
1096         }
1097 }
1098 impl Readable for Duration {
1099         #[inline]
1100         fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1101                 let secs = Readable::read(r)?;
1102                 let nanos = Readable::read(r)?;
1103                 Ok(Duration::new(secs, nanos))
1104         }
1105 }
1106
1107 #[cfg(test)]
1108 mod tests {
1109         use core::convert::TryFrom;
1110         use crate::util::ser::{Readable, Hostname, Writeable};
1111
1112         #[test]
1113         fn hostname_conversion() {
1114                 assert_eq!(Hostname::try_from(String::from("a-test.com")).unwrap().as_str(), "a-test.com");
1115
1116                 assert!(Hostname::try_from(String::from("\"")).is_err());
1117                 assert!(Hostname::try_from(String::from("$")).is_err());
1118                 assert!(Hostname::try_from(String::from("⚡")).is_err());
1119                 let mut large_vec = Vec::with_capacity(256);
1120                 large_vec.resize(256, b'A');
1121                 assert!(Hostname::try_from(String::from_utf8(large_vec).unwrap()).is_err());
1122         }
1123
1124         #[test]
1125         fn hostname_serialization() {
1126                 let hostname = Hostname::try_from(String::from("test")).unwrap();
1127                 let mut buf: Vec<u8> = Vec::new();
1128                 hostname.write(&mut buf).unwrap();
1129                 assert_eq!(Hostname::read(&mut buf.as_slice()).unwrap().as_str(), "test");
1130         }
1131 }