pub trait UpfrontShutdownScript: Context {}
impl UpfrontShutdownScript for InitContext {}
impl UpfrontShutdownScript for NodeContext {}
+
+ pub trait VariableLengthOnion: Context {}
+ impl VariableLengthOnion for InitContext {}
+ impl VariableLengthOnion for NodeContext {}
+
+ pub trait PaymentSecret: Context {}
+ impl PaymentSecret for InitContext {}
+ impl PaymentSecret for NodeContext {}
+
+ pub trait BasicMPP: Context {}
+ impl BasicMPP for InitContext {}
+ impl BasicMPP for NodeContext {}
}
/// Tracks the set of features which a node implements, templated by the context in which it
impl InitFeatures {
/// Create a Features with the features we support
- #[cfg(not(feature = "fuzztarget"))]
- pub(crate) fn supported() -> InitFeatures {
- InitFeatures {
- flags: vec![2 | 1 << 5],
- mark: PhantomData,
- }
- }
- #[cfg(feature = "fuzztarget")]
pub fn supported() -> InitFeatures {
InitFeatures {
- flags: vec![2 | 1 << 5],
+ flags: vec![2 | 1 << 5, 1 << (9-8) | 1 << (15 - 8), 1 << (17 - 8*2)],
mark: PhantomData,
}
}
mark: PhantomData,
}
}
+
+ /// Takes the flags that we know how to interpret in an init-context features that are also
+ /// relevant in a channel-context features and creates a channel-context features from them.
+ pub(crate) fn with_known_relevant_init_flags(_init_ctx: &InitFeatures) -> Self {
+ // There are currently no channel flags defined that we understand.
+ Self { flags: Vec::new(), mark: PhantomData, }
+ }
}
impl NodeFeatures {
#[cfg(not(feature = "fuzztarget"))]
pub(crate) fn supported() -> NodeFeatures {
NodeFeatures {
- flags: vec![2 | 1 << 5],
+ flags: vec![2 | 1 << 5, 1 << (9-8) | 1 << (15 - 8), 1 << (17 - 8*2)],
mark: PhantomData,
}
}
#[cfg(feature = "fuzztarget")]
pub fn supported() -> NodeFeatures {
NodeFeatures {
- flags: vec![2 | 1 << 5],
+ flags: vec![2 | 1 << 5, 1 << (9-8) | 1 << (15 - 8), 1 << (17 - 8*2)],
mark: PhantomData,
}
}
+
+ /// Takes the flags that we know how to interpret in an init-context features that are also
+ /// relevant in a node-context features and creates a node-context features from them.
+ pub(crate) fn with_known_relevant_init_flags(init_ctx: &InitFeatures) -> Self {
+ let mut flags = Vec::new();
+ if init_ctx.flags.len() > 0 {
+ // Pull out data_loss_protect and upfront_shutdown_script (bits 0, 1, 4, and 5)
+ flags.push(init_ctx.flags.last().unwrap() & 0b00110011);
+ }
+ Self { flags, mark: PhantomData, }
+ }
}
impl<T: sealed::Context> Features<T> {
pub(crate) fn requires_unknown_bits(&self) -> bool {
self.flags.iter().enumerate().any(|(idx, &byte)| {
- ( idx != 0 && (byte & 0x55) != 0 ) || ( idx == 0 && (byte & 0x14) != 0 )
+ (match idx {
+ 0 => (byte & 0b01000100),
+ 1 => (byte & 0b00010100),
+ 2 => (byte & 0b01010100),
+ _ => (byte & 0b01010101),
+ }) != 0
})
}
pub(crate) fn supports_unknown_bits(&self) -> bool {
self.flags.iter().enumerate().any(|(idx, &byte)| {
- ( idx != 0 && byte != 0 ) || ( idx == 0 && (byte & 0xc4) != 0 )
+ (match idx {
+ 0 => (byte & 0b11000100),
+ 1 => (byte & 0b00111100),
+ 2 => (byte & 0b11111100),
+ _ => byte,
+ }) != 0
})
}
#[cfg(test)]
pub(crate) fn set_require_unknown_bits(&mut self) {
- let newlen = cmp::max(2, self.flags.len());
+ let newlen = cmp::max(3, self.flags.len());
self.flags.resize(newlen, 0u8);
- self.flags[1] |= 0x40;
+ self.flags[2] |= 0x40;
}
#[cfg(test)]
pub(crate) fn clear_require_unknown_bits(&mut self) {
- let newlen = cmp::max(2, self.flags.len());
+ let newlen = cmp::max(3, self.flags.len());
self.flags.resize(newlen, 0u8);
- self.flags[1] &= !0x40;
+ self.flags[2] &= !0x40;
+ if self.flags.len() == 3 && self.flags[2] == 0 {
+ self.flags.resize(2, 0u8);
+ }
if self.flags.len() == 2 && self.flags[1] == 0 {
self.flags.resize(1, 0u8);
}
}
}
+impl<T: sealed::VariableLengthOnion> Features<T> {
+ pub(crate) fn supports_variable_length_onion(&self) -> bool {
+ self.flags.len() > 1 && (self.flags[1] & 3) != 0
+ }
+}
+
impl<T: sealed::InitialRoutingSync> Features<T> {
pub(crate) fn initial_routing_sync(&self) -> bool {
self.flags.len() > 0 && (self.flags[0] & (1 << 3)) != 0
}
}
+impl<T: sealed::PaymentSecret> Features<T> {
+ #[allow(dead_code)]
+ // Note that we never need to test this since what really matters is the invoice - iff the
+ // invoice provides a payment_secret, we assume all the way through that we can do MPP.
+ pub(crate) fn payment_secret(&self) -> bool {
+ self.flags.len() > 1 && (self.flags[1] & (3 << (12-8))) != 0
+ }
+}
+
+impl<T: sealed::BasicMPP> Features<T> {
+ // We currently never test for this since we don't actually *generate* multipath routes.
+ #[allow(dead_code)]
+ pub(crate) fn basic_mpp(&self) -> bool {
+ self.flags.len() > 2 && (self.flags[2] & (3 << (16-8*2))) != 0
+ }
+}
+
impl<T: sealed::Context> Writeable for Features<T> {
fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
w.size_hint(self.flags.len() + 2);
})
}
}
+
+#[cfg(test)]
+mod tests {
+ use super::{ChannelFeatures, InitFeatures, NodeFeatures};
+
+ #[test]
+ fn sanity_test_our_features() {
+ assert!(!ChannelFeatures::supported().requires_unknown_bits());
+ assert!(!ChannelFeatures::supported().supports_unknown_bits());
+ assert!(!InitFeatures::supported().requires_unknown_bits());
+ assert!(!InitFeatures::supported().supports_unknown_bits());
+ assert!(!NodeFeatures::supported().requires_unknown_bits());
+ assert!(!NodeFeatures::supported().supports_unknown_bits());
+
+ assert!(InitFeatures::supported().supports_upfront_shutdown_script());
+ assert!(NodeFeatures::supported().supports_upfront_shutdown_script());
+
+ assert!(InitFeatures::supported().supports_data_loss_protect());
+ assert!(NodeFeatures::supported().supports_data_loss_protect());
+
+ let mut init_features = InitFeatures::supported();
+ init_features.set_initial_routing_sync();
+ assert!(!init_features.requires_unknown_bits());
+ assert!(!init_features.supports_unknown_bits());
+ }
+
+ #[test]
+ fn sanity_test_unkown_bits_testing() {
+ let mut features = ChannelFeatures::supported();
+ features.set_require_unknown_bits();
+ assert!(features.requires_unknown_bits());
+ features.clear_require_unknown_bits();
+ assert!(!features.requires_unknown_bits());
+ }
+}