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onchaind: use lightningd to sign and broadcast htlc spending txs.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2023-04-06 09:03:25 +09:30
parent a9dfec0e71
commit 868fa8ae81
6 changed files with 108 additions and 20 deletions
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70
lightningd/onchain_control.c
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@@ -557,6 +557,11 @@ struct onchain_signing_info {
struct bitcoin_signature remote_htlc_sig;
struct preimage preimage;
} htlc_success;
/* WIRE_ONCHAIND_SPEND_FULFILL */
struct {
struct pubkey remote_per_commitment_point;
struct preimage preimage;
} fulfill;
} u;
};
@@ -618,6 +623,22 @@ static u8 *sign_htlc_success(const tal_t *ctx,
info->channel->dbid);
}
static u8 *sign_fulfill(const tal_t *ctx,
const struct bitcoin_tx *tx,
const struct onchain_signing_info *info)
{
const bool anchor_outputs = channel_has(info->channel, OPT_ANCHOR_OUTPUTS);
assert(info->msgtype == WIRE_ONCHAIND_SPEND_FULFILL);
return towire_hsmd_sign_any_remote_htlc_to_us(ctx,
&info->u.fulfill.remote_per_commitment_point,
tx, info->wscript,
anchor_outputs,
0,
&info->channel->peer->id,
info->channel->dbid);
}
/* Matches bitcoin_witness_sig_and_element! */
static const struct onchain_witness_element **
onchain_witness_sig_and_element(const tal_t *ctx, u8 **witness)
@@ -913,6 +934,51 @@ static void handle_onchaind_spend_penalty(struct channel *channel,
__func__);
}
static void handle_onchaind_spend_fulfill(struct channel *channel,
const u8 *msg)
{
struct lightningd *ld = channel->peer->ld;
struct onchain_signing_info *info;
struct bitcoin_outpoint out;
struct amount_sat out_sats;
struct preimage preimage;
u32 initial_feerate;
u64 htlc_id;
const bool anchor_outputs = channel_has(channel, OPT_ANCHOR_OUTPUTS);
info = new_signing_info(msg, channel, WIRE_ONCHAIND_SPEND_FULFILL);
info->minblock = 0;
if (!fromwire_onchaind_spend_fulfill(info, msg,
&out, &out_sats,
&htlc_id,
&info->u.fulfill.remote_per_commitment_point,
&preimage,
&info->wscript)) {
channel_internal_error(channel, "Invalid onchaind_spend_fulfill %s",
tal_hex(tmpctx, msg));
return;
}
info->stack_elem = tal_dup(info, struct preimage, &preimage);
/* FIXME: Be more sophisticated! */
initial_feerate = htlc_resolution_feerate(ld->topology);
if (!initial_feerate)
initial_feerate = tx_feerate(channel->last_tx);
info->deadline_block = htlc_incoming_deadline(channel, htlc_id);
/* BOLT #3:
*
* Note that if `option_anchors` applies, the nSequence field of
* the spending input must be `1`.
*/
create_onchain_tx(channel, &out, out_sats,
anchor_outputs ? 1 : 0,
0,
initial_feerate, sign_fulfill, info,
__func__);
}
static void handle_onchaind_spend_htlc_success(struct channel *channel,
const u8 *msg)
{
@@ -1048,6 +1114,10 @@ static unsigned int onchain_msg(struct subd *sd, const u8 *msg, const int *fds U
handle_onchaind_spend_htlc_success(sd->channel, msg);
break;
case WIRE_ONCHAIND_SPEND_FULFILL:
handle_onchaind_spend_fulfill(sd->channel, msg);
break;
/* We send these, not receive them */
case WIRE_ONCHAIND_INIT:
case WIRE_ONCHAIND_SPENT: