1 // This file is Copyright its original authors, visible in version control
2 // history and in the source files from which this was generated.
4 // This file is licensed under the license available in the LICENSE or LICENSE.md
5 // file in the root of this repository or, if no such file exists, the same
6 // license as that which applies to the original source files from which this
7 // source was automatically generated.
9 //! This module contains traits for LDK to access UTXOs to check gossip data is correct.
11 //! When lightning nodes gossip channel information, they resist DoS attacks by checking that each
12 //! channel matches a UTXO on-chain, requiring at least some marginal on-chain transacting in
13 //! order to announce a channel. This module handles that checking.
15 use alloc::str::FromStr;
16 use core::ffi::c_void;
17 use core::convert::Infallible;
18 use bitcoin::hashes::Hash;
19 use crate::c_types::*;
20 #[cfg(feature="no-std")]
21 use alloc::{vec::Vec, boxed::Box};
23 /// An error when accessing the chain via [`UtxoLookup`].
27 pub enum UtxoLookupError {
28 /// The requested chain is unknown.
30 /// The requested transaction doesn't exist or hasn't confirmed.
33 use lightning::routing::utxo::UtxoLookupError as UtxoLookupErrorImport;
34 pub(crate) type nativeUtxoLookupError = UtxoLookupErrorImport;
36 impl UtxoLookupError {
38 pub(crate) fn to_native(&self) -> nativeUtxoLookupError {
40 UtxoLookupError::UnknownChain => nativeUtxoLookupError::UnknownChain,
41 UtxoLookupError::UnknownTx => nativeUtxoLookupError::UnknownTx,
45 pub(crate) fn into_native(self) -> nativeUtxoLookupError {
47 UtxoLookupError::UnknownChain => nativeUtxoLookupError::UnknownChain,
48 UtxoLookupError::UnknownTx => nativeUtxoLookupError::UnknownTx,
52 pub(crate) fn from_native(native: &nativeUtxoLookupError) -> Self {
54 nativeUtxoLookupError::UnknownChain => UtxoLookupError::UnknownChain,
55 nativeUtxoLookupError::UnknownTx => UtxoLookupError::UnknownTx,
59 pub(crate) fn native_into(native: nativeUtxoLookupError) -> Self {
61 nativeUtxoLookupError::UnknownChain => UtxoLookupError::UnknownChain,
62 nativeUtxoLookupError::UnknownTx => UtxoLookupError::UnknownTx,
66 /// Creates a copy of the UtxoLookupError
68 pub extern "C" fn UtxoLookupError_clone(orig: &UtxoLookupError) -> UtxoLookupError {
72 /// Utility method to constructs a new UnknownChain-variant UtxoLookupError
73 pub extern "C" fn UtxoLookupError_unknown_chain() -> UtxoLookupError {
74 UtxoLookupError::UnknownChain}
76 /// Utility method to constructs a new UnknownTx-variant UtxoLookupError
77 pub extern "C" fn UtxoLookupError_unknown_tx() -> UtxoLookupError {
78 UtxoLookupError::UnknownTx}
79 /// The result of a [`UtxoLookup::get_utxo`] call. A call may resolve either synchronously,
80 /// returning the `Sync` variant, or asynchronously, returning an [`UtxoFuture`] in the `Async`
86 /// A result which was resolved synchronously. It either includes a [`TxOut`] for the output
87 /// requested or a [`UtxoLookupError`].
89 crate::c_types::derived::CResult_TxOutUtxoLookupErrorZ),
90 /// A result which will be resolved asynchronously. It includes a [`UtxoFuture`], a `clone` of
91 /// which you must keep locally and call [`UtxoFuture::resolve`] on once the lookup completes.
93 /// Note that in order to avoid runaway memory usage, the number of parallel checks is limited,
94 /// but only fairly loosely. Because a pending checks block all message processing, leaving
95 /// checks pending for an extended time may cause DoS of other functions. It is recommended you
96 /// keep a tight timeout on lookups, on the order of a few seconds.
98 crate::lightning::routing::utxo::UtxoFuture),
100 use lightning::routing::utxo::UtxoResult as UtxoResultImport;
101 pub(crate) type nativeUtxoResult = UtxoResultImport;
105 pub(crate) fn to_native(&self) -> nativeUtxoResult {
107 UtxoResult::Sync (ref a, ) => {
108 let mut a_nonref = Clone::clone(a);
109 let mut local_a_nonref = match a_nonref.result_ok { true => Ok( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut a_nonref.contents.result)) }).into_rust() }), false => Err( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut a_nonref.contents.err)) }).into_native() })};
110 nativeUtxoResult::Sync (
114 UtxoResult::Async (ref a, ) => {
115 let mut a_nonref = Clone::clone(a);
116 nativeUtxoResult::Async (
117 *unsafe { Box::from_raw(a_nonref.take_inner()) },
123 pub(crate) fn into_native(self) -> nativeUtxoResult {
125 UtxoResult::Sync (mut a, ) => {
126 let mut local_a = match a.result_ok { true => Ok( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut a.contents.result)) }).into_rust() }), false => Err( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut a.contents.err)) }).into_native() })};
127 nativeUtxoResult::Sync (
131 UtxoResult::Async (mut a, ) => {
132 nativeUtxoResult::Async (
133 *unsafe { Box::from_raw(a.take_inner()) },
139 pub(crate) fn from_native(native: &nativeUtxoResult) -> Self {
141 nativeUtxoResult::Sync (ref a, ) => {
142 let mut a_nonref = Clone::clone(a);
143 let mut local_a_nonref = match a_nonref { Ok(mut o) => crate::c_types::CResultTempl::ok( { crate::c_types::TxOut::from_rust(o) }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { crate::lightning::routing::utxo::UtxoLookupError::native_into(e) }).into() };
148 nativeUtxoResult::Async (ref a, ) => {
149 let mut a_nonref = Clone::clone(a);
151 crate::lightning::routing::utxo::UtxoFuture { inner: ObjOps::heap_alloc(a_nonref), is_owned: true },
157 pub(crate) fn native_into(native: nativeUtxoResult) -> Self {
159 nativeUtxoResult::Sync (mut a, ) => {
160 let mut local_a = match a { Ok(mut o) => crate::c_types::CResultTempl::ok( { crate::c_types::TxOut::from_rust(o) }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { crate::lightning::routing::utxo::UtxoLookupError::native_into(e) }).into() };
165 nativeUtxoResult::Async (mut a, ) => {
167 crate::lightning::routing::utxo::UtxoFuture { inner: ObjOps::heap_alloc(a), is_owned: true },
173 /// Frees any resources used by the UtxoResult
175 pub extern "C" fn UtxoResult_free(this_ptr: UtxoResult) { }
176 /// Creates a copy of the UtxoResult
178 pub extern "C" fn UtxoResult_clone(orig: &UtxoResult) -> UtxoResult {
182 /// Utility method to constructs a new Sync-variant UtxoResult
183 pub extern "C" fn UtxoResult_sync(a: crate::c_types::derived::CResult_TxOutUtxoLookupErrorZ) -> UtxoResult {
184 UtxoResult::Sync(a, )
187 /// Utility method to constructs a new Async-variant UtxoResult
188 pub extern "C" fn UtxoResult_async(a: crate::lightning::routing::utxo::UtxoFuture) -> UtxoResult {
189 UtxoResult::Async(a, )
191 /// The `UtxoLookup` trait defines behavior for accessing on-chain UTXOs.
193 pub struct UtxoLookup {
194 /// An opaque pointer which is passed to your function implementations as an argument.
195 /// This has no meaning in the LDK, and can be NULL or any other value.
196 pub this_arg: *mut c_void,
197 /// Returns the transaction output of a funding transaction encoded by [`short_channel_id`].
198 /// Returns an error if `genesis_hash` is for a different chain or if such a transaction output
201 /// [`short_channel_id`]: https://github.com/lightning/bolts/blob/master/07-routing-gossip.md#definition-of-short_channel_id
203 pub get_utxo: extern "C" fn (this_arg: *const c_void, genesis_hash: *const [u8; 32], short_channel_id: u64) -> crate::lightning::routing::utxo::UtxoResult,
204 /// Frees any resources associated with this object given its this_arg pointer.
205 /// Does not need to free the outer struct containing function pointers and may be NULL is no resources need to be freed.
206 pub free: Option<extern "C" fn(this_arg: *mut c_void)>,
208 unsafe impl Send for UtxoLookup {}
209 unsafe impl Sync for UtxoLookup {}
211 pub(crate) extern "C" fn UtxoLookup_clone_fields(orig: &UtxoLookup) -> UtxoLookup {
213 this_arg: orig.this_arg,
214 get_utxo: Clone::clone(&orig.get_utxo),
215 free: Clone::clone(&orig.free),
219 use lightning::routing::utxo::UtxoLookup as rustUtxoLookup;
220 impl rustUtxoLookup for UtxoLookup {
221 fn get_utxo(&self, mut genesis_hash: &bitcoin::BlockHash, mut short_channel_id: u64) -> lightning::routing::utxo::UtxoResult {
222 let mut ret = (self.get_utxo)(self.this_arg, genesis_hash.as_inner(), short_channel_id);
227 // We're essentially a pointer already, or at least a set of pointers, so allow us to be used
228 // directly as a Deref trait in higher-level structs:
229 impl core::ops::Deref for UtxoLookup {
231 fn deref(&self) -> &Self {
235 /// Calls the free function if one is set
237 pub extern "C" fn UtxoLookup_free(this_ptr: UtxoLookup) { }
238 impl Drop for UtxoLookup {
240 if let Some(f) = self.free {
246 use lightning::routing::utxo::UtxoFuture as nativeUtxoFutureImport;
247 pub(crate) type nativeUtxoFuture = nativeUtxoFutureImport;
249 /// Represents a future resolution of a [`UtxoLookup::get_utxo`] query resolving async.
251 /// See [`UtxoResult::Async`] and [`UtxoFuture::resolve`] for more info.
254 pub struct UtxoFuture {
255 /// A pointer to the opaque Rust object.
257 /// Nearly everywhere, inner must be non-null, however in places where
258 /// the Rust equivalent takes an Option, it may be set to null to indicate None.
259 pub inner: *mut nativeUtxoFuture,
260 /// Indicates that this is the only struct which contains the same pointer.
262 /// Rust functions which take ownership of an object provided via an argument require
263 /// this to be true and invalidate the object pointed to by inner.
267 impl Drop for UtxoFuture {
269 if self.is_owned && !<*mut nativeUtxoFuture>::is_null(self.inner) {
270 let _ = unsafe { Box::from_raw(ObjOps::untweak_ptr(self.inner)) };
274 /// Frees any resources used by the UtxoFuture, if is_owned is set and inner is non-NULL.
276 pub extern "C" fn UtxoFuture_free(this_obj: UtxoFuture) { }
278 /// Used only if an object of this type is returned as a trait impl by a method
279 pub(crate) extern "C" fn UtxoFuture_free_void(this_ptr: *mut c_void) {
280 let _ = unsafe { Box::from_raw(this_ptr as *mut nativeUtxoFuture) };
284 pub(crate) fn get_native_ref(&self) -> &'static nativeUtxoFuture {
285 unsafe { &*ObjOps::untweak_ptr(self.inner) }
287 pub(crate) fn get_native_mut_ref(&self) -> &'static mut nativeUtxoFuture {
288 unsafe { &mut *ObjOps::untweak_ptr(self.inner) }
290 /// When moving out of the pointer, we have to ensure we aren't a reference, this makes that easy
291 pub(crate) fn take_inner(mut self) -> *mut nativeUtxoFuture {
292 assert!(self.is_owned);
293 let ret = ObjOps::untweak_ptr(self.inner);
294 self.inner = core::ptr::null_mut();
298 impl Clone for UtxoFuture {
299 fn clone(&self) -> Self {
301 inner: if <*mut nativeUtxoFuture>::is_null(self.inner) { core::ptr::null_mut() } else {
302 ObjOps::heap_alloc(unsafe { &*ObjOps::untweak_ptr(self.inner) }.clone()) },
308 /// Used only if an object of this type is returned as a trait impl by a method
309 pub(crate) extern "C" fn UtxoFuture_clone_void(this_ptr: *const c_void) -> *mut c_void {
310 Box::into_raw(Box::new(unsafe { (*(this_ptr as *mut nativeUtxoFuture)).clone() })) as *mut c_void
313 /// Creates a copy of the UtxoFuture
314 pub extern "C" fn UtxoFuture_clone(orig: &UtxoFuture) -> UtxoFuture {
317 /// Builds a new future for later resolution.
320 pub extern "C" fn UtxoFuture_new() -> crate::lightning::routing::utxo::UtxoFuture {
321 let mut ret = lightning::routing::utxo::UtxoFuture::new();
322 crate::lightning::routing::utxo::UtxoFuture { inner: ObjOps::heap_alloc(ret), is_owned: true }
325 /// Resolves this future against the given `graph` and with the given `result`.
327 /// This is identical to calling [`UtxoFuture::resolve`] with a dummy `gossip`, disabling
328 /// forwarding the validated gossip message onwards to peers.
330 /// Because this may cause the [`NetworkGraph`]'s [`processing_queue_high`] to flip, in order
331 /// to allow us to interact with peers again, you should call [`PeerManager::process_events`]
334 /// [`processing_queue_high`]: crate::ln::msgs::RoutingMessageHandler::processing_queue_high
335 /// [`PeerManager::process_events`]: crate::ln::peer_handler::PeerManager::process_events
337 pub extern "C" fn UtxoFuture_resolve_without_forwarding(this_arg: &crate::lightning::routing::utxo::UtxoFuture, graph: &crate::lightning::routing::gossip::NetworkGraph, mut result: crate::c_types::derived::CResult_TxOutUtxoLookupErrorZ) {
338 let mut local_result = match result.result_ok { true => Ok( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut result.contents.result)) }).into_rust() }), false => Err( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut result.contents.err)) }).into_native() })};
339 unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.resolve_without_forwarding(graph.get_native_ref(), local_result)
342 /// Resolves this future against the given `graph` and with the given `result`.
344 /// The given `gossip` is used to broadcast any validated messages onwards to all peers which
345 /// have available buffer space.
347 /// Because this may cause the [`NetworkGraph`]'s [`processing_queue_high`] to flip, in order
348 /// to allow us to interact with peers again, you should call [`PeerManager::process_events`]
351 /// [`processing_queue_high`]: crate::ln::msgs::RoutingMessageHandler::processing_queue_high
352 /// [`PeerManager::process_events`]: crate::ln::peer_handler::PeerManager::process_events
354 pub extern "C" fn UtxoFuture_resolve(this_arg: &crate::lightning::routing::utxo::UtxoFuture, graph: &crate::lightning::routing::gossip::NetworkGraph, gossip: &crate::lightning::routing::gossip::P2PGossipSync, mut result: crate::c_types::derived::CResult_TxOutUtxoLookupErrorZ) {
355 let mut local_result = match result.result_ok { true => Ok( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut result.contents.result)) }).into_rust() }), false => Err( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut result.contents.err)) }).into_native() })};
356 unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.resolve(graph.get_native_ref(), gossip.get_native_ref(), local_result)