Support all shutdown scripts defined in BOLT 2

[rust-lightning] / lightning / src / chain / channelmonitor.rs

diff --git a/lightning/src/chain/channelmonitor.rs b/lightning/src/chain/channelmonitor.rs
index 7904d9bdefa4935a68ab44e04722fe5d5a220dc2..fd097f30cc200cf6318297294cdc6867bd62970f 100644 (file)
--- a/lightning/src/chain/channelmonitor.rs
+++ b/lightning/src/chain/channelmonitor.rs
@@ -493,7 +493,7 @@ pub(crate) struct ChannelMonitorImpl<Signer: Sign> {
        destination_script: Script,
        broadcasted_holder_revokable_script: Option<(Script, PublicKey, PublicKey)>,
        counterparty_payment_script: Script,
-       shutdown_script: Script,
+       shutdown_script: Option<Script>,
 
        channel_keys_id: [u8; 32],
        holder_revocation_basepoint: PublicKey,
@@ -669,7 +669,10 @@ impl<Signer: Sign> Writeable for ChannelMonitorImpl<Signer> {
                }
 
                self.counterparty_payment_script.write(writer)?;
-               self.shutdown_script.write(writer)?;
+               match &self.shutdown_script {
+                       Some(script) => script.write(writer)?,
+                       None => Script::new().write(writer)?,
+               }
 
                self.channel_keys_id.write(writer)?;
                self.holder_revocation_basepoint.write(writer)?;
@@ -799,7 +802,7 @@ impl<Signer: Sign> Writeable for ChannelMonitorImpl<Signer> {
 }
 
 impl<Signer: Sign> ChannelMonitor<Signer> {
-       pub(crate) fn new(secp_ctx: Secp256k1<secp256k1::All>, keys: Signer, shutdown_pubkey: &PublicKey,
+       pub(crate) fn new(secp_ctx: Secp256k1<secp256k1::All>, keys: Signer, shutdown_script: Option<Script>,
                          on_counterparty_tx_csv: u16, destination_script: &Script, funding_info: (OutPoint, Script),
                          channel_parameters: &ChannelTransactionParameters,
                          funding_redeemscript: Script, channel_value_satoshis: u64,
@@ -808,8 +811,6 @@ impl<Signer: Sign> ChannelMonitor<Signer> {
                          best_block: BestBlock) -> ChannelMonitor<Signer> {
 
                assert!(commitment_transaction_number_obscure_factor <= (1 << 48));
-               let our_channel_close_key_hash = WPubkeyHash::hash(&shutdown_pubkey.serialize());
-               let shutdown_script = Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script();
                let payment_key_hash = WPubkeyHash::hash(&keys.pubkeys().payment_point.serialize());
                let counterparty_payment_script = Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&payment_key_hash[..]).into_script();
 
@@ -2485,7 +2486,7 @@ impl<Signer: Sign> ChannelMonitorImpl<Signer> {
                                }));
                                break;
                        }
-                       if outp.script_pubkey == self.shutdown_script {
+                       if self.shutdown_script.as_ref() == Some(&outp.script_pubkey) {
                                spendable_output = Some(SpendableOutputDescriptor::StaticOutput {
                                        outpoint: OutPoint { txid: tx.txid(), index: i as u16 },
                                        output: outp.clone(),
@@ -2622,7 +2623,10 @@ impl<'a, Signer: Sign, K: KeysInterface<Signer = Signer>> ReadableArgs<&'a K>
                        _ => return Err(DecodeError::InvalidValue),
                };
                let counterparty_payment_script = Readable::read(reader)?;
-               let shutdown_script = Readable::read(reader)?;
+               let shutdown_script = {
+                       let script = <Script as Readable>::read(reader)?;
+                       if script.is_empty() { None } else { Some(script) }
+               };
 
                let channel_keys_id = Readable::read(reader)?;
                let holder_revocation_basepoint = Readable::read(reader)?;
@@ -2854,6 +2858,7 @@ mod tests {
        use ln::{PaymentPreimage, PaymentHash};
        use ln::chan_utils;
        use ln::chan_utils::{HTLCOutputInCommitment, ChannelPublicKeys, ChannelTransactionParameters, HolderCommitmentTransaction, CounterpartyChannelTransactionParameters};
+       use ln::script::ShutdownScript;
        use util::test_utils::{TestLogger, TestBroadcaster, TestFeeEstimator};
        use bitcoin::secp256k1::key::{SecretKey,PublicKey};
        use bitcoin::secp256k1::Secp256k1;
@@ -2947,9 +2952,10 @@ mod tests {
                };
                // Prune with one old state and a holder commitment tx holding a few overlaps with the
                // old state.
+               let shutdown_pubkey = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
                let best_block = BestBlock::from_genesis(Network::Testnet);
                let monitor = ChannelMonitor::new(Secp256k1::new(), keys,
-                                                 &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()), 0, &Script::new(),
+                                                 Some(ShutdownScript::new_p2wpkh_from_pubkey(shutdown_pubkey).into_inner()), 0, &Script::new(),
                                                  (OutPoint { txid: Txid::from_slice(&[43; 32]).unwrap(), index: 0 }, Script::new()),
                                                  &channel_parameters,
                                                  Script::new(), 46, 0,