127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/* My example:
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* ./create-commit-spend-tx A-commit.tx A-open.pb B-open.pb cTJtiQKZLTufMhhRhxUdbZ2oKJY2MU6sLDEk62mSGoe4NEubLN2e 039bda7e7063afd6aba752b33ca9ae455c4e8d7297b8db01bb06879e0036bde27f > A-spend.tx
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*/
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#include <ccan/crypto/shachain/shachain.h>
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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#include <ccan/opt/opt.h>
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#include <ccan/str/hex/hex.h>
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#include <ccan/err/err.h>
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#include <ccan/read_write_all/read_write_all.h>
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#include <ccan/structeq/structeq.h>
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#include "lightning.pb-c.h"
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#include "anchor.h"
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#include "base58.h"
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#include "pkt.h"
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#include "bitcoin_script.h"
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#include "permute_tx.h"
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#include "signature.h"
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#include "commit_tx.h"
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#include "pubkey.h"
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#include "bitcoin_address.h"
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#include "opt_bits.h"
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#include "find_p2sh_out.h"
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#include <openssl/ec.h>
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#include <unistd.h>
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int main(int argc, char *argv[])
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{
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const tal_t *ctx = tal_arr(NULL, char, 0);
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OpenChannel *o1, *o2;
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struct bitcoin_tx *commit, *tx;
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struct bitcoin_signature sig;
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EC_KEY *privkey;
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bool testnet;
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struct pubkey pubkey1, pubkey2, outpubkey;
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u8 *redeemscript, *tx_arr;
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char *tx_hex;
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struct sha256 rhash;
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size_t p2sh_out;
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u64 fee = 10000;
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err_set_progname(argv[0]);
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/* FIXME: If we've updated channel since, we need the final
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* revocation hash we sent (either update_accept or update_complete) */
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opt_register_noarg("--help|-h", opt_usage_and_exit,
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"<commitment-tx> <open-channel-file1> <open-channel-file2> <my-privoutkey> <someaddress>\n"
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"Create the transaction to spend our commit transaction",
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"Print this message.");
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opt_register_arg("--fee=<bits>",
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opt_set_bits, opt_show_bits, &fee,
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"100's of satoshi to pay in transaction fee");
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opt_parse(&argc, argv, opt_log_stderr_exit);
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if (argc != 6)
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opt_usage_exit_fail("Expected 5 arguments");
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commit = bitcoin_tx_from_file(ctx, argv[1]);
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o1 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open;
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o2 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
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/* We need our private key to spend commit output. */
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privkey = key_from_base58(argv[4], strlen(argv[4]), &testnet, &pubkey1);
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if (!privkey)
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errx(1, "Invalid private key '%s'", argv[4]);
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if (!testnet)
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errx(1, "Private key '%s' not on testnet!", argv[4]);
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if (!pubkey_from_hexstr(argv[5], &outpubkey))
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errx(1, "Invalid bitcoin pubkey '%s'", argv[5]);
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/* Get pubkeys */
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if (!proto_to_pubkey(o1->final, &pubkey2))
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errx(1, "Invalid o1 final pubkey");
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if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
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|| memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
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errx(1, "o1 pubkey != this privkey");
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if (!proto_to_pubkey(o2->final, &pubkey2))
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errx(1, "Invalid o2 final pubkey");
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/* o1 gives us the revocation hash */
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proto_to_sha256(o1->revocation_hash, &rhash);
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/* Create redeem script */
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redeemscript = bitcoin_redeem_revocable(ctx, &pubkey1,
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o2->locktime_seconds,
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&pubkey2, &rhash);
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/* Now, create transaction to spend it. */
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tx = bitcoin_tx(ctx, 1, 1);
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bitcoin_txid(commit, &tx->input[0].txid);
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p2sh_out = find_p2sh_out(commit, redeemscript);
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tx->input[0].index = p2sh_out;
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if (commit->output[p2sh_out].amount <= fee)
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errx(1, "Amount of %llu won't exceed fee",
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(unsigned long long)commit->output[p2sh_out].amount);
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tx->output[0].amount = commit->output[p2sh_out].amount - fee;
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tx->output[0].script = scriptpubkey_p2sh(tx,
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bitcoin_redeem_single(tx, &outpubkey));
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tx->output[0].script_length = cpu_to_le32(tal_count(tx->output[0].script));
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/* Now get signature, to set up input script. */
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if (!sign_tx_input(tx, tx, 0, redeemscript, tal_count(redeemscript),
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privkey, &sig.sig))
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errx(1, "Could not sign tx");
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sig.stype = SIGHASH_ALL;
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tx->input[0].script = scriptsig_p2sh_single_sig(tx, redeemscript,
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tal_count(redeemscript),
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&sig);
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tx->input[0].script_length = cpu_to_le32(tal_count(tx->input[0].script));
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/* Print it out in hex. */
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tx_arr = linearize_tx(ctx, tx);
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tx_hex = tal_arr(tx_arr, char, hex_str_size(tal_count(tx_arr)));
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hex_encode(tx_arr, tal_count(tx_arr), tx_hex, tal_count(tx_hex));
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if (!write_all(STDOUT_FILENO, tx_hex, strlen(tx_hex)))
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err(1, "Writing out transaction");
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tal_free(ctx);
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return 0;
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}
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