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channeld: have commit_tx tell is what output was the other's anchor.

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We're going to want this, soon.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2023-10-26 13:03:28 +10:30
parent 9b3965c805
commit 01d31e7dde
5 changed files with 44 additions and 29 deletions
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34
channeld/commit_tx.c
View File

@ -128,7 +128,8 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
u64 obscured_commitment_number,
bool option_anchor_outputs,
bool option_anchors_zero_fee_htlc_tx,
enum side side)
enum side side,
int *anchor_outnum)
{
struct amount_sat base_fee;
struct amount_msat total_pay;
@ -139,7 +140,8 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
u32 *cltvs;
bool to_local, to_remote;
struct htlc *dummy_to_local = (struct htlc *)0x01,
*dummy_to_remote = (struct htlc *)0x02;
*dummy_to_remote = (struct htlc *)0x02,
*dummy_other_anchor = (struct htlc *)0x03;
const u8 *funding_wscript = bitcoin_redeem_2of2(tmpctx,
local_funding_key,
remote_funding_key);
@ -379,9 +381,11 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
n++;
}
/* With anchors, the caller really wants to know what
* is the LOCAL anchor for the REMOTE side. */
if (to_remote || untrimmed != 0) {
tx_add_anchor_output(tx, remote_funding_key);
(*htlcmap)[n] = NULL;
(*htlcmap)[n] = dummy_other_anchor;
n++;
}
}
@ -433,17 +437,21 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
bitcoin_tx_add_input(tx, funding,
sequence, NULL, funding_sats, NULL, funding_wscript);
/* Identify the direct outputs (to_us, to_them). */
if (direct_outputs != NULL) {
/* Identify the direct outputs (to_us, to_them), and the local anchor */
if (direct_outputs != NULL)
direct_outputs[LOCAL] = direct_outputs[REMOTE] = NULL;
for (size_t i = 0; i < tx->wtx->num_outputs; i++) {
if ((*htlcmap)[i] == dummy_to_local) {
(*htlcmap)[i] = NULL;
direct_outputs[LOCAL] = tx->wtx->outputs + i;
} else if ((*htlcmap)[i] == dummy_to_remote) {
(*htlcmap)[i] = NULL;
direct_outputs[REMOTE] = tx->wtx->outputs + i;
}
*anchor_outnum = -1;
for (size_t i = 0; i < tx->wtx->num_outputs; i++) {
if ((*htlcmap)[i] == dummy_to_local) {
(*htlcmap)[i] = NULL;
direct_outputs[LOCAL] = tx->wtx->outputs + i;
} else if ((*htlcmap)[i] == dummy_to_remote) {
(*htlcmap)[i] = NULL;
direct_outputs[REMOTE] = tx->wtx->outputs + i;
} else if ((*htlcmap)[i] == dummy_other_anchor) {
(*htlcmap)[i] = NULL;
*anchor_outnum = i;
}
}

6
channeld/commit_tx.h
View File

@ -63,8 +63,9 @@ bool commit_tx_amount_trimmed(const struct htlc **htlcs,
* @obscured_commitment_number: number to encode in commitment transaction
* @direct_outputs: If non-NULL, fill with pointers to the direct (non-HTLC) outputs (or NULL if none).
* @option_anchor_outputs: does option_anchor_outputs apply to this channel?
* @option_anchors_zero_fee_htlc_tx: does option_anchors_zero_fee_htlc_tx apply to this channel?
* @side: side to generate commitment transaction for.
* @option_anchor_outputs: does option_anchor_outputs apply to this channel?
* @anchor_outnum: set to index of local anchor, or -1 if none.
*
* We need to be able to generate the remote side's tx to create signatures,
* but the BOLT is expressed in terms of generating our local commitment
@ -90,6 +91,7 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
u64 obscured_commitment_number,
bool option_anchor_outputs,
bool option_anchors_zero_fee_htlc_tx,
enum side side);
enum side side,
int *anchor_outnum);
#endif /* LIGHTNING_CHANNELD_COMMIT_TX_H */

3
channeld/full_channel.c
View File

@ -315,6 +315,7 @@ struct bitcoin_tx **channel_txs(const tal_t *ctx,
const struct htlc **committed;
struct keyset keyset;
struct amount_msat side_pay, other_side_pay;
int local_anchor;
if (!derive_keyset(per_commitment_point,
&channel->basepoints[side],
@ -363,7 +364,7 @@ struct bitcoin_tx **channel_txs(const tal_t *ctx,
commitment_number ^ channel->commitment_number_obscurer,
channel_has(channel, OPT_ANCHOR_OUTPUTS),
channel_has(channel, OPT_ANCHORS_ZERO_FEE_HTLC_TX),
side);
side, &local_anchor);
/* Set the remote/local pubkeys on the commitment tx psbt */
psbt_input_add_pubkey(txs[0]->psbt, 0,

23
channeld/test/run-commit_tx.c
View File

@ -542,6 +542,7 @@ int main(int argc, const char *argv[])
bool option_anchor_outputs = false;
bool option_anchors_zero_fee_htlc_tx = false;
bool option_static_remotekey = false;
int local_anchor;
/* Allow us to check static-remotekey BOLT 3 vectors, too */
if (argv[1] && streq(argv[1], "--static-remotekey"))
@ -822,7 +823,7 @@ int main(int argc, const char *argv[])
NULL, &htlc_map, NULL, commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
LOCAL);
LOCAL, &local_anchor);
print_superverbose = false;
tx2 = commit_tx(tmpctx,
&funding,
@ -839,7 +840,7 @@ int main(int argc, const char *argv[])
NULL, &htlc_map2, NULL, commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
REMOTE);
REMOTE, &local_anchor);
tx_must_be_eq(tx, tx2);
report(tx, wscript, &x_remote_funding_privkey, &remote_funding_pubkey,
&local_funding_privkey, &local_funding_pubkey,
@ -891,7 +892,7 @@ int main(int argc, const char *argv[])
htlcs, &htlc_map, NULL, commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
LOCAL);
LOCAL, &local_anchor);
print_superverbose = false;
tx2 = commit_tx(tmpctx,
&funding,
@ -909,7 +910,7 @@ int main(int argc, const char *argv[])
commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
REMOTE);
REMOTE, &local_anchor);
tx_must_be_eq(tx, tx2);
report(tx, wscript, &x_remote_funding_privkey, &remote_funding_pubkey,
&local_funding_privkey, &local_funding_pubkey,
@ -949,7 +950,7 @@ int main(int argc, const char *argv[])
commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
LOCAL);
LOCAL, &local_anchor);
/* This is what it would look like for peer generating it! */
tx2 = commit_tx(tmpctx,
&funding,
@ -967,7 +968,7 @@ int main(int argc, const char *argv[])
commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
REMOTE);
REMOTE, &local_anchor);
tx_must_be_eq(newtx, tx2);
#ifdef DEBUG
if (feerate_per_kw % 100000 == 0)
@ -1011,7 +1012,7 @@ int main(int argc, const char *argv[])
commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
LOCAL);
LOCAL, &local_anchor);
report(tx, wscript,
&x_remote_funding_privkey, &remote_funding_pubkey,
&local_funding_privkey, &local_funding_pubkey,
@ -1063,7 +1064,7 @@ int main(int argc, const char *argv[])
commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
LOCAL);
LOCAL, &local_anchor);
report(newtx, wscript,
&x_remote_funding_privkey, &remote_funding_pubkey,
&local_funding_privkey, &local_funding_pubkey,
@ -1142,7 +1143,7 @@ int main(int argc, const char *argv[])
commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
LOCAL);
LOCAL, &local_anchor);
report(tx, wscript,
&x_remote_funding_privkey, &remote_funding_pubkey,
&local_funding_privkey, &local_funding_pubkey,
@ -1199,7 +1200,7 @@ int main(int argc, const char *argv[])
htlcs, &htlc_map, NULL, commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
LOCAL);
LOCAL, &local_anchor);
print_superverbose = false;
tx2 = commit_tx(tmpctx,
&funding,
@ -1217,7 +1218,7 @@ int main(int argc, const char *argv[])
commitment_number ^ cn_obscurer,
option_anchor_outputs,
option_anchors_zero_fee_htlc_tx,
REMOTE);
REMOTE, &local_anchor);
tx_must_be_eq(tx, tx2);
report(tx, wscript, &x_remote_funding_privkey, &remote_funding_pubkey,
&local_funding_privkey, &local_funding_pubkey,

7
channeld/test/run-full_channel.c
View File

@ -364,6 +364,7 @@ int main(int argc, const char *argv[])
bool option_anchor_outputs = false;
bool option_anchors_zero_fee_htlc_tx = false;
u32 blockheight = 0;
int local_anchor;
size_t i;
chainparams = chainparams_for_network("bitcoin");
@ -535,7 +536,8 @@ int main(int argc, const char *argv[])
to_local,
to_remote,
NULL, &htlc_map, NULL, 0x2bb038521914 ^ 42,
option_anchor_outputs, option_anchors_zero_fee_htlc_tx, LOCAL);
option_anchor_outputs, option_anchors_zero_fee_htlc_tx,
LOCAL, &local_anchor);
txs = channel_txs(tmpctx, &funding, funding_amount,
&htlc_map, NULL, &funding_wscript_alt,
@ -667,7 +669,8 @@ int main(int argc, const char *argv[])
&keyset, feerate_per_kw[LOCAL], local_config->dust_limit,
to_local, to_remote, htlcs, &htlc_map, NULL,
0x2bb038521914 ^ 42,
option_anchor_outputs, option_anchors_zero_fee_htlc_tx, LOCAL);
option_anchor_outputs, option_anchors_zero_fee_htlc_tx,
LOCAL, &local_anchor);
txs = channel_txs(tmpctx, &funding, funding_amount,
&htlc_map, NULL, &funding_wscript,