105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
#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 "bitcoin/privkey.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 <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 pkt *pkt;
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struct signature sig;
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struct privkey privkey;
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bool testnet, complete = false;
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struct pubkey pubkey1, pubkey2;
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u8 *redeemscript;
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int64_t delta;
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size_t i, anchor_out;
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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("--complete", opt_set_bool, &complete,
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"Create a close_transaction_complete msg instead");
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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> <commit-privkey> [update-protobuf]...\n"
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"Create the signature needed for the close transaction",
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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 < 5)
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opt_usage_exit_fail("Expected 4+ 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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if (!key_from_base58(argv[4], strlen(argv[4]), &testnet, &privkey, &pubkey1))
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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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bitcoin_txid(anchor, &anchor_txid);
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/* Get delta by accumulting all the updates. */
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delta = 0;
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for (i = 5; 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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/* Get pubkeys */
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if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey2))
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errx(1, "Invalid o1 commit 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->anchor->pubkey, &pubkey2))
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errx(1, "Invalid o2 final pubkey");
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/* This is what the anchor pays to; figure out whick 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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/* Assumes that updates are all from closer -> closee */
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anchor_out = find_p2sh_out(anchor, redeemscript);
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close_tx = create_close_tx(ctx, o1, o2, complete ? -delta : delta,
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&anchor_txid,
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anchor->output[anchor_out].amount,
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anchor_out);
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/* Sign it for them. */
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sign_tx_input(ctx, close_tx, 0, redeemscript, tal_count(redeemscript),
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&privkey, &pubkey1, &sig);
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if (complete)
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pkt = close_channel_complete_pkt(ctx, &sig);
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else
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pkt = close_channel_pkt(ctx, &sig);
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if (!write_all(STDOUT_FILENO, pkt, pkt_totlen(pkt)))
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err(1, "Writing out packet");
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tal_free(ctx);
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return 0;
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}
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