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120 lines
3.6 KiB
120 lines
3.6 KiB
#include "bitcoin/pubkey.h"
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#include "bitcoin/script.h"
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#include "bitcoin/shadouble.h"
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#include "bitcoin/tx.h"
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#include "commit_tx.h"
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#include "funding.h"
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#include "overflows.h"
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#include "permute_tx.h"
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#include "pkt.h"
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#include "protobuf_convert.h"
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static bool add_htlc(struct bitcoin_tx *tx, size_t n,
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const UpdateAddHtlc *h,
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const struct pubkey *ourkey,
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const struct pubkey *theirkey,
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const struct sha256 *rhash,
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u32 locktime,
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u8 *(*scriptpubkeyfn)(const tal_t *,
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const struct pubkey *,
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const struct pubkey *,
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uint64_t,
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uint32_t,
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uint32_t,
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const struct sha256 *,
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const struct sha256 *))
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{
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uint32_t htlc_abstime;
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struct sha256 htlc_rhash;
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assert(!tx->output[n].script);
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/* This shouldn't happen... */
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if (!proto_to_abs_locktime(h->expiry, &htlc_abstime))
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return false;
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proto_to_sha256(h->r_hash, &htlc_rhash);
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tx->output[n].script = scriptpubkey_p2sh(tx,
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scriptpubkeyfn(tx, ourkey, theirkey, h->amount,
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htlc_abstime, locktime, rhash,
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&htlc_rhash));
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tx->output[n].script_length = tal_count(tx->output[n].script);
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tx->output[n].amount = h->amount;
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return true;
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}
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struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
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OpenChannel *ours,
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OpenChannel *theirs,
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OpenAnchor *anchor,
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const struct sha256 *rhash,
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const struct channel_state *cstate)
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{
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struct bitcoin_tx *tx;
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const u8 *redeemscript;
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struct pubkey ourkey, theirkey;
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u32 locktime;
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size_t i, num;
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uint64_t total;
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/* Now create commitment tx: one input, two outputs (plus htlcs) */
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tx = bitcoin_tx(ctx, 1, 2 + tal_count(cstate->a.htlcs)
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+ tal_count(cstate->b.htlcs));
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/* Our input spends the anchor tx output. */
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proto_to_sha256(anchor->txid, &tx->input[0].txid.sha);
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tx->input[0].index = anchor->output_index;
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tx->input[0].input_amount = anchor->amount;
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/* Output goes to our final pubkeys */
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if (!proto_to_pubkey(ours->final_key, &ourkey))
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return tal_free(tx);
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if (!proto_to_pubkey(theirs->final_key, &theirkey))
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return tal_free(tx);
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if (!proto_to_rel_locktime(theirs->delay, &locktime))
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return tal_free(tx);
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/* First output is a P2SH to a complex redeem script (usu. for me) */
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redeemscript = bitcoin_redeem_secret_or_delay(tx, &ourkey,
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locktime,
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&theirkey,
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rhash);
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tx->output[0].script = scriptpubkey_p2sh(tx, redeemscript);
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tx->output[0].script_length = tal_count(tx->output[0].script);
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tx->output[0].amount = cstate->a.pay;
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/* Second output is a P2SH payment to them. */
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tx->output[1].script = scriptpubkey_p2sh(ctx,
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bitcoin_redeem_single(ctx,
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&theirkey));
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tx->output[1].script_length = tal_count(tx->output[1].script);
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tx->output[1].amount = cstate->b.pay;
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/* First two outputs done, now for the HTLCs. */
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total = tx->output[0].amount + tx->output[1].amount;
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num = 2;
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/* HTLCs we've sent. */
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for (i = 0; i < tal_count(cstate->a.htlcs); i++) {
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if (!add_htlc(tx, num, cstate->a.htlcs[i], &ourkey, &theirkey,
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rhash, locktime, scriptpubkey_htlc_send))
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return tal_free(tx);
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total += tx->output[num++].amount;
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}
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/* HTLCs we've received. */
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for (i = 0; i < tal_count(cstate->b.htlcs); i++) {
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if (!add_htlc(tx, num, cstate->b.htlcs[i], &ourkey, &theirkey,
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rhash, locktime, scriptpubkey_htlc_recv))
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return tal_free(tx);
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total += tx->output[num++].amount;
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}
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assert(num == tx->output_count);
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/* Calculate fee; difference of inputs and outputs. */
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assert(total <= tx->input[0].input_amount);
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tx->fee = tx->input[0].input_amount - total;
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permute_outputs(tx->output, tx->output_count, NULL);
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return tx;
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}
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