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https://github.com/ElementsProject/lightning.git
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109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/* My example:
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* ./create-close-tx A-anchor.tx A-open.pb B-open.pb A-close.pb B-close-complete.pb > A-close.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 "lightning.pb-c.h"
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#include "anchor.h"
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#include "bitcoin/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 "bitcoin/signature.h"
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#include "bitcoin/pubkey.h"
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#include "close_tx.h"
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#include "find_p2sh_out.h"
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#include "protobuf_convert.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 *anchor, *close_tx;
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struct sha256_double anchor_txid;
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struct bitcoin_signature sig1, sig2;
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struct pubkey pubkey1, pubkey2;
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u8 *redeemscript, *tx_arr;
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char *tx_hex;
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CloseChannel *close;
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CloseChannelComplete *closecomplete;
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size_t i;
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int64_t delta;
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err_set_progname(argv[0]);
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/* FIXME: Take update.pbs to adjust channel */
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opt_register_noarg("--help|-h", opt_usage_and_exit,
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"<anchor-tx> <open-channel-file1> <open-channel-file2> <close-protobuf> <close-complete-protobuf> [update-protobuf]...\n"
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"Create the close transaction from the signatures",
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"Print this message.");
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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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anchor = 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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close = pkt_from_file(argv[4], PKT__PKT_CLOSE)->close;
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closecomplete = pkt_from_file(argv[5], PKT__PKT_CLOSE_COMPLETE)->close_complete;
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bitcoin_txid(anchor, &anchor_txid);
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/* Pubkeys well-formed? */
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if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey1))
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errx(1, "Invalid anchor-1 key");
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if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
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errx(1, "Invalid anchor-2 key");
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/* Get delta by accumulting all the updates. */
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delta = 0;
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for (i = 6; i < argc; i++) {
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Update *u = pkt_from_file(argv[i], PKT__PKT_UPDATE)->update;
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delta += u->delta;
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}
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/* This is what the anchor pays to; figure out which output. */
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redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
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/* Now create the close tx to spend 2/2 output of anchor. */
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close_tx = create_close_tx(ctx, o1, o2, delta, &anchor_txid,
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find_p2sh_out(anchor, redeemscript));
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/* Signatures well-formed? */
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sig1.stype = sig2.stype = SIGHASH_ALL;
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if (!proto_to_signature(close->sig, &sig1.sig))
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errx(1, "Invalid close-packet");
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if (!proto_to_signature(closecomplete->sig, &sig2.sig))
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errx(1, "Invalid closecomplete-packet");
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/* Combined signatures must validate correctly. */
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if (!check_2of2_sig(close_tx, 0, redeemscript, tal_count(redeemscript),
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&pubkey1, &pubkey2, &sig1, &sig2))
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errx(1, "Signature failed");
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/* Create p2sh input for close_tx */
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close_tx->input[0].script = scriptsig_p2sh_2of2(close_tx, &sig1, &sig2,
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&pubkey1, &pubkey2);
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close_tx->input[0].script_length = tal_count(close_tx->input[0].script);
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/* Print it out in hex. */
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tx_arr = linearize_tx(ctx, close_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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