+// This file is Copyright its original authors, visible in version control
+// history.
+//
+// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
+// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
+// You may not use this file except in accordance with one or both of these
+// licenses.
+
macro_rules! encode_tlv {
- ($stream: expr, {$(($type: expr, $field: expr)),*}) => { {
+ ($stream: expr, {$(($type: expr, $field: expr)),*}, {$(($optional_type: expr, $optional_field: expr)),*}) => { {
+ #[allow(unused_imports)]
use util::ser::{BigSize, LengthCalculatingWriter};
+ // Fields must be serialized in order, so we have to potentially switch between optional
+ // fields and normal fields while serializing. Thus, we end up having to loop over the type
+ // counts.
+ // Sadly, while LLVM does appear smart enough to make `max_field` a constant, it appears to
+ // refuse to unroll the loop. If we have enough entries that this is slow we can revisit
+ // this design in the future.
+ #[allow(unused_mut)]
+ let mut max_field: u64 = 0;
+ $(
+ if $type >= max_field { max_field = $type + 1; }
+ )*
$(
- BigSize($type).write($stream)?;
- let mut len_calc = LengthCalculatingWriter(0);
- $field.write(&mut len_calc)?;
- BigSize(len_calc.0 as u64).write($stream)?;
- $field.write($stream)?;
+ if $optional_type >= max_field { max_field = $optional_type + 1; }
)*
+ #[allow(unused_variables)]
+ for i in 0..max_field {
+ $(
+ if i == $type {
+ BigSize($type).write($stream)?;
+ let mut len_calc = LengthCalculatingWriter(0);
+ $field.write(&mut len_calc)?;
+ BigSize(len_calc.0 as u64).write($stream)?;
+ $field.write($stream)?;
+ }
+ )*
+ $(
+ if i == $optional_type {
+ if let Some(ref field) = $optional_field {
+ BigSize($optional_type).write($stream)?;
+ let mut len_calc = LengthCalculatingWriter(0);
+ field.write(&mut len_calc)?;
+ BigSize(len_calc.0 as u64).write($stream)?;
+ field.write($stream)?;
+ }
+ }
+ )*
+ }
} }
}
macro_rules! encode_varint_length_prefixed_tlv {
- ($stream: expr, {$(($type: expr, $field: expr)),*}) => { {
+ ($stream: expr, {$(($type: expr, $field: expr)),*}, {$(($optional_type: expr, $optional_field: expr)),*}) => { {
use util::ser::{BigSize, LengthCalculatingWriter};
+ #[allow(unused_mut)]
let mut len = LengthCalculatingWriter(0);
{
$(
BigSize(field_len.0 as u64).write(&mut len)?;
len.0 += field_len.0;
)*
+ $(
+ if let Some(ref field) = $optional_field {
+ BigSize($optional_type).write(&mut len)?;
+ let mut field_len = LengthCalculatingWriter(0);
+ field.write(&mut field_len)?;
+ BigSize(field_len.0 as u64).write(&mut len)?;
+ len.0 += field_len.0;
+ }
+ )*
}
BigSize(len.0 as u64).write($stream)?;
- encode_tlv!($stream, {
- $(($type, $field)),*
- });
+ encode_tlv!($stream, { $(($type, $field)),* }, { $(($optional_type, $optional_field)),* });
} }
}
_ => {},
}
// As we read types, make sure we hit every required type:
- $(if (last_seen_type.is_none() || last_seen_type.unwrap() < $reqtype) && typ.0 > $reqtype {
- Err(DecodeError::InvalidValue)?
+ $({
+ #[allow(unused_comparisons)] // Note that $reqtype may be 0 making the second comparison always true
+ let invalid_order = (last_seen_type.is_none() || last_seen_type.unwrap() < $reqtype) && typ.0 > $reqtype;
+ if invalid_order {
+ Err(DecodeError::InvalidValue)?
+ }
})*
last_seen_type = Some(typ.0);
s.eat_remaining()?;
}
// Make sure we got to each required type after we've read every TLV:
- $(if last_seen_type.is_none() || last_seen_type.unwrap() < $reqtype {
- Err(DecodeError::InvalidValue)?
+ $({
+ #[allow(unused_comparisons)] // Note that $reqtype may be 0 making the second comparison always true
+ let missing_req_type = last_seen_type.is_none() || last_seen_type.unwrap() < $reqtype;
+ if missing_req_type {
+ Err(DecodeError::InvalidValue)?
+ }
})*
} }
}
if $len != 0 {
w.size_hint($len);
}
+ #[cfg(any(test, feature = "fuzztarget"))]
+ {
+ // In tests, assert that the hard-coded length matches the actual one
+ if $len != 0 {
+ use util::ser::LengthCalculatingWriter;
+ let mut len_calc = LengthCalculatingWriter(0);
+ $( self.$field.write(&mut len_calc)?; )*
+ assert_eq!(len_calc.0, $len);
+ }
+ }
$( self.$field.write(w)?; )*
Ok(())
}
}
}
macro_rules! impl_writeable_len_match {
- ($st:ident, {$({$m: pat, $l: expr}),*}, {$($field:ident),*}) => {
- impl Writeable for $st {
+ ($struct: ident, $cmp: tt, {$({$match: pat, $length: expr}),*}, {$($field:ident),*}) => {
+ impl Writeable for $struct {
fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
- w.size_hint(match *self {
- $($m => $l,)*
- });
+ let len = match *self {
+ $($match => $length,)*
+ };
+ w.size_hint(len);
+ #[cfg(any(test, feature = "fuzztarget"))]
+ {
+ // In tests, assert that the hard-coded length matches the actual one
+ use util::ser::LengthCalculatingWriter;
+ let mut len_calc = LengthCalculatingWriter(0);
+ $( self.$field.write(&mut len_calc)?; )*
+ assert!(len_calc.0 $cmp len);
+ }
$( self.$field.write(w)?; )*
Ok(())
}
}
- impl ::util::ser::Readable for $st {
+ impl ::util::ser::Readable for $struct {
fn read<R: ::std::io::Read>(r: &mut R) -> Result<Self, DecodeError> {
Ok(Self {
$($field: Readable::read(r)?),*
})
}
}
+ };
+ ($struct: ident, {$({$match: pat, $length: expr}),*}, {$($field:ident),*}) => {
+ impl_writeable_len_match!($struct, ==, { $({ $match, $length }),* }, { $($field),* });
+ }
+}
+
+/// Write out two bytes to indicate the version of an object.
+/// $this_version represents a unique version of a type. Incremented whenever the type's
+/// serialization format has changed or has a new interpretation. Used by a type's
+/// reader to determine how to interpret fields or if it can understand a serialized
+/// object.
+/// $min_version_that_can_read_this is the minimum reader version which can understand this
+/// serialized object. Previous versions will simply err with a
+/// DecodeError::UnknownVersion.
+///
+/// Updates to either $this_version or $min_version_that_can_read_this should be included in
+/// release notes.
+///
+/// Both version fields can be specific to this type of object.
+macro_rules! write_ver_prefix {
+ ($stream: expr, $this_version: expr, $min_version_that_can_read_this: expr) => {
+ $stream.write_all(&[$this_version; 1])?;
+ $stream.write_all(&[$min_version_that_can_read_this; 1])?;
+ }
+}
+
+/// Writes out a suffix to an object which contains potentially backwards-compatible, optional
+/// fields which old nodes can happily ignore.
+///
+/// It is written out in TLV format and, as with all TLV fields, unknown even fields cause a
+/// DecodeError::UnknownRequiredFeature error, with unknown odd fields ignored.
+///
+/// This is the preferred method of adding new fields that old nodes can ignore and still function
+/// correctly.
+macro_rules! write_tlv_fields {
+ ($stream: expr, {$(($type: expr, $field: expr)),* $(,)*}, {$(($optional_type: expr, $optional_field: expr)),* $(,)*}) => {
+ encode_varint_length_prefixed_tlv!($stream, {$(($type, $field)),*} , {$(($optional_type, $optional_field)),*});
+ }
+}
+
+/// Reads a prefix added by write_ver_prefix!(), above. Takes the current version of the
+/// serialization logic for this object. This is compared against the
+/// $min_version_that_can_read_this added by write_ver_prefix!().
+macro_rules! read_ver_prefix {
+ ($stream: expr, $this_version: expr) => { {
+ let ver: u8 = Readable::read($stream)?;
+ let min_ver: u8 = Readable::read($stream)?;
+ if min_ver > $this_version {
+ return Err(DecodeError::UnknownVersion);
+ }
+ ver
+ } }
+}
+
+/// Reads a suffix added by write_tlv_fields.
+macro_rules! read_tlv_fields {
+ ($stream: expr, {$(($reqtype: expr, $reqfield: ident)),* $(,)*}, {$(($type: expr, $field: ident)),* $(,)*}) => { {
+ let tlv_len = ::util::ser::BigSize::read($stream)?;
+ let mut rd = ::util::ser::FixedLengthReader::new($stream, tlv_len.0);
+ decode_tlv!(&mut rd, {$(($reqtype, $reqfield)),*}, {$(($type, $field)),*});
+ rd.eat_remaining().map_err(|_| DecodeError::ShortRead)?;
+ } }
+}
+
+// If we naively create a struct in impl_writeable_tlv_based below, we may end up returning
+// `Self { ,,vecfield: vecfield }` which is obviously incorrect. Instead, we have to match here to
+// detect at least one empty field set and skip the potentially-extra comma.
+macro_rules! _init_tlv_based_struct {
+ ({}, {$($field: ident),*}, {$($vecfield: ident),*}) => {
+ Ok(Self {
+ $($field),*,
+ $($vecfield: $vecfield.unwrap().0),*
+ })
+ };
+ ({$($reqfield: ident),*}, {}, {$($vecfield: ident),*}) => {
+ Ok(Self {
+ $($reqfield: $reqfield.0.unwrap()),*,
+ $($vecfield: $vecfield.unwrap().0),*
+ })
+ };
+ ({$($reqfield: ident),*}, {$($field: ident),*}, {}) => {
+ Ok(Self {
+ $($reqfield: $reqfield.0.unwrap()),*,
+ $($field),*
+ })
+ };
+ ({$($reqfield: ident),*}, {$($field: ident),*}, {$($vecfield: ident),*}) => {
+ Ok(Self {
+ $($reqfield: $reqfield.0.unwrap()),*,
+ $($field),*,
+ $($vecfield: $vecfield.unwrap().0),*
+ })
+ }
+}
+
+// If we don't have any optional types below, but do have some vec types, we end up calling
+// `write_tlv_field!($stream, {..}, {, (vec_ty, vec_val)})`, which is obviously broken.
+// Instead, for write and read we match the missing values and skip the extra comma.
+macro_rules! _write_tlv_fields {
+ ($stream: expr, {$(($type: expr, $field: expr)),* $(,)*}, {}, {$(($optional_type: expr, $optional_field: expr)),* $(,)*}) => {
+ write_tlv_fields!($stream, {$(($type, $field)),*} , {$(($optional_type, $optional_field)),*});
+ };
+ ($stream: expr, {$(($type: expr, $field: expr)),* $(,)*}, {$(($optional_type: expr, $optional_field: expr)),* $(,)*}, {$(($optional_type_2: expr, $optional_field_2: expr)),* $(,)*}) => {
+ write_tlv_fields!($stream, {$(($type, $field)),*} , {$(($optional_type, $optional_field)),*, $(($optional_type_2, $optional_field_2)),*});
+ }
+}
+macro_rules! _read_tlv_fields {
+ ($stream: expr, {$(($reqtype: expr, $reqfield: ident)),* $(,)*}, {}, {$(($type: expr, $field: ident)),* $(,)*}) => {
+ read_tlv_fields!($stream, {$(($reqtype, $reqfield)),*}, {$(($type, $field)),*});
+ };
+ ($stream: expr, {$(($reqtype: expr, $reqfield: ident)),* $(,)*}, {$(($type: expr, $field: ident)),* $(,)*}, {$(($type_2: expr, $field_2: ident)),* $(,)*}) => {
+ read_tlv_fields!($stream, {$(($reqtype, $reqfield)),*}, {$(($type, $field)),*, $(($type_2, $field_2)),*});
+ }
+}
+
+/// Implements Readable/Writeable for a struct storing it as a set of TLVs
+/// First block includes all the required fields including a dummy value which is used during
+/// deserialization but which will never be exposed to other code.
+/// The second block includes optional fields.
+/// The third block includes any Vecs which need to have their individual elements serialized.
+macro_rules! impl_writeable_tlv_based {
+ ($st: ident, {$(($reqtype: expr, $reqfield: ident)),* $(,)*}, {$(($type: expr, $field: ident)),* $(,)*}, {$(($vectype: expr, $vecfield: ident)),* $(,)*}) => {
+ impl ::util::ser::Writeable for $st {
+ fn write<W: ::util::ser::Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ _write_tlv_fields!(writer, {
+ $(($reqtype, self.$reqfield)),*
+ }, {
+ $(($type, self.$field)),*
+ }, {
+ $(($vectype, Some(::util::ser::VecWriteWrapper(&self.$vecfield)))),*
+ });
+ Ok(())
+ }
+ }
+
+ impl ::util::ser::Readable for $st {
+ fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, ::ln::msgs::DecodeError> {
+ $(
+ let mut $reqfield = ::util::ser::OptionDeserWrapper(None);
+ )*
+ $(
+ let mut $field = None;
+ )*
+ $(
+ let mut $vecfield = Some(::util::ser::VecReadWrapper(Vec::new()));
+ )*
+ _read_tlv_fields!(reader, {
+ $(($reqtype, $reqfield)),*
+ }, {
+ $(($type, $field)),*
+ }, {
+ $(($vectype, $vecfield)),*
+ });
+ _init_tlv_based_struct!({$($reqfield),*}, {$($field),*}, {$($vecfield),*})
+ }
+ }
}
}
let mut stream = VecWriter(Vec::new());
stream.0.clear();
- encode_varint_length_prefixed_tlv!(&mut stream, { (1, 1u8) });
+ encode_varint_length_prefixed_tlv!(&mut stream, { (1, 1u8) }, { (42, None::<u64>) });
+ assert_eq!(stream.0, ::hex::decode("03010101").unwrap());
+
+ stream.0.clear();
+ encode_varint_length_prefixed_tlv!(&mut stream, { }, { (1, Some(1u8)) });
assert_eq!(stream.0, ::hex::decode("03010101").unwrap());
stream.0.clear();
- encode_varint_length_prefixed_tlv!(&mut stream, { (4, 0xabcdu16) });
+ encode_varint_length_prefixed_tlv!(&mut stream, { (4, 0xabcdu16) }, { (42, None::<u64>) });
assert_eq!(stream.0, ::hex::decode("040402abcd").unwrap());
stream.0.clear();
- encode_varint_length_prefixed_tlv!(&mut stream, { (0xff, 0xabcdu16) });
+ encode_varint_length_prefixed_tlv!(&mut stream, { (0xff, 0xabcdu16) }, { (42, None::<u64>) });
assert_eq!(stream.0, ::hex::decode("06fd00ff02abcd").unwrap());
stream.0.clear();
- encode_varint_length_prefixed_tlv!(&mut stream, { (0, 1u64), (0xff, HighZeroBytesDroppedVarInt(0u64)) });
+ encode_varint_length_prefixed_tlv!(&mut stream, { (0, 1u64), (0xff, HighZeroBytesDroppedVarInt(0u64)) }, { (42, None::<u64>) });
+ assert_eq!(stream.0, ::hex::decode("0e00080000000000000001fd00ff00").unwrap());
+
+ stream.0.clear();
+ encode_varint_length_prefixed_tlv!(&mut stream, { (0xff, HighZeroBytesDroppedVarInt(0u64)) }, { (0, Some(1u64)) });
assert_eq!(stream.0, ::hex::decode("0e00080000000000000001fd00ff00").unwrap());
Ok(())
projects / rust-lightning / blobdiff