/* Process various packets: return an error packet on failure. */
Pkt *accept_pkt_open(struct peer *peer, const Pkt *pkt)
{
struct rel_locktime locktime;
const OpenChannel *o = pkt->open;
if (!proto_to_rel_locktime(o->delay, &locktime))
return pkt_err(peer, "Invalid delay");
if (o->delay->locktime_case != LOCKTIME__LOCKTIME_BLOCKS)
return pkt_err(peer, "Delay in seconds not accepted");
if (o->delay->blocks > peer->dstate->config.locktime_max)
return pkt_err(peer, "Delay too great");
if (o->min_depth > peer->dstate->config.anchor_confirms_max)
return pkt_err(peer, "min_depth too great");
if (o->initial_fee_rate < peer->dstate->config.commitment_fee_rate_min)
return pkt_err(peer, "Commitment fee rate too low");
if (o->anch == OPEN_CHANNEL__ANCHOR_OFFER__WILL_CREATE_ANCHOR)
peer->remote.offer_anchor = CMD_OPEN_WITH_ANCHOR;
else if (o->anch == OPEN_CHANNEL__ANCHOR_OFFER__WONT_CREATE_ANCHOR)
peer->remote.offer_anchor = CMD_OPEN_WITHOUT_ANCHOR;
else
return pkt_err(peer, "Unknown offer anchor value");
if (peer->remote.offer_anchor == peer->local.offer_anchor)
return pkt_err(peer, "Only one side can offer anchor");
if (!proto_to_rel_locktime(o->delay, &peer->remote.locktime))
return pkt_err(peer, "Malformed locktime");
peer->remote.mindepth = o->min_depth;
peer->remote.commit_fee_rate = o->initial_fee_rate;
if (!proto_to_pubkey(peer->dstate->secpctx,
o->commit_key, &peer->remote.commitkey))
return pkt_err(peer, "Bad commitkey");
if (!proto_to_pubkey(peer->dstate->secpctx,
o->final_key, &peer->remote.finalkey))
return pkt_err(peer, "Bad finalkey");
/* Set up their commit info now: rest gets done in setup_first_commit
* once anchor is established. */
peer->remote.commit = new_commit_info(peer);
proto_to_sha256(o->revocation_hash, &peer->remote.commit->revocation_hash);
proto_to_sha256(o->next_revocation_hash,
&peer->remote.next_revocation_hash);
/* Witness script for anchor. */
peer->anchor.witnessscript
= bitcoin_redeem_2of2(peer, peer->dstate->secpctx,
&peer->local.commitkey,
&peer->remote.commitkey);
return NULL;
}
int main(int argc, char *argv[])
{
const tal_t *ctx = tal_arr(NULL, char, 0);
OpenChannel *o1, *o2;
OpenAnchor *a;
struct bitcoin_tx *commit, *tx;
struct bitcoin_signature sig;
struct privkey privkey;
bool testnet;
struct pubkey pubkey1, pubkey2, outpubkey;
u8 *redeemscript;
struct sha256 rhash;
size_t p2sh_out;
u64 fee = 10000;
u32 locktime;
err_set_progname(argv[0]);
/* FIXME: If we've updated channel since, we need the final
* revocation hash we sent (either update_accept or update_complete) */
opt_register_noarg("--help|-h", opt_usage_and_exit,
"<commitment-tx> <open-channel-file1> <open-channel-file2> <open-anchor-file> <my-privoutkey> <someaddress> [previous-updates]\n"
"Create the transaction to spend our commit transaction",
"Print this message.");
opt_register_arg("--fee=<bits>",
opt_set_bits, opt_show_bits, &fee,
"100's of satoshi to pay in transaction fee");
opt_register_version();
opt_parse(&argc, argv, opt_log_stderr_exit);
if (argc < 6)
opt_usage_exit_fail("Expected 5+ arguments");
commit = bitcoin_tx_from_file(ctx, argv[1]);
o1 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open;
o2 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
a = pkt_from_file(argv[4], PKT__PKT_OPEN_ANCHOR)->open_anchor;
if (!proto_to_rel_locktime(o2->delay, &locktime))
errx(1, "Invalid locktime in o2");
/* We need our private key to spend commit output. */
if (!key_from_base58(argv[5], strlen(argv[5]), &testnet, &privkey, &pubkey1))
errx(1, "Invalid private key '%s'", argv[5]);
if (!testnet)
errx(1, "Private key '%s' not on testnet!", argv[5]);
if (!pubkey_from_hexstr(argv[6], &outpubkey))
errx(1, "Invalid bitcoin pubkey '%s'", argv[6]);
/* Get pubkeys */
if (!proto_to_pubkey(o1->final_key, &pubkey2))
errx(1, "Invalid o1 final pubkey");
if (!pubkey_eq(&pubkey1, &pubkey2))
errx(1, "o1 pubkey != this privkey");
if (!proto_to_pubkey(o2->final_key, &pubkey2))
errx(1, "Invalid o2 final pubkey");
/* We use this simply to get final revocation hash. */
gather_updates(ctx, o1, o2, a, commit_fee(o1, o2), argv + 7,
NULL, &rhash, NULL, NULL);
/* Create redeem script */
redeemscript = bitcoin_redeem_secret_or_delay(ctx, &pubkey1, locktime,
&pubkey2, &rhash);
/* Now, create transaction to spend it. */
tx = bitcoin_tx(ctx, 1, 1);
bitcoin_txid(commit, &tx->input[0].txid);
p2sh_out = find_p2sh_out(commit, redeemscript);
tx->input[0].index = p2sh_out;
tx->input[0].input_amount = commit->output[p2sh_out].amount;
tx->fee = fee;
tx->input[0].sequence_number = bitcoin_nsequence(locktime);
if (commit->output[p2sh_out].amount <= fee)
errx(1, "Amount of %llu won't exceed fee",
(unsigned long long)commit->output[p2sh_out].amount);
tx->output[0].amount = commit->output[p2sh_out].amount - fee;
tx->output[0].script = scriptpubkey_p2sh(tx,
bitcoin_redeem_single(tx, &outpubkey));
tx->output[0].script_length = tal_count(tx->output[0].script);
/* Now get signature, to set up input script. */
if (!sign_tx_input(tx, tx, 0, redeemscript, tal_count(redeemscript),
&privkey, &pubkey1, &sig.sig))
errx(1, "Could not sign tx");
sig.stype = SIGHASH_ALL;
tx->input[0].script = scriptsig_p2sh_secret(tx, NULL, 0, &sig,
redeemscript,
tal_count(redeemscript));
tx->input[0].script_length = tal_count(tx->input[0].script);
/* Print it out in hex. */
if (!bitcoin_tx_write(STDOUT_FILENO, tx))
err(1, "Writing out transaction");
tal_free(ctx);
return 0;
}
