8 changed files with 183 additions and 4 deletions
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/* My example:
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* ./close-channel A-anchor.tx A-open.pb B-open.pb cUBCjrdJu8tfvM7FT8So6aqs6G6bZS1Cax6Rc9rFzYL6nYG4XNEC > A-close.pb |
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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 "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 "pubkey.h" |
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#include "close_tx.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 pkt *pkt; |
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struct signature sig; |
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EC_KEY *privkey; |
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bool testnet; |
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struct pubkey pubkey1, pubkey2; |
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u8 *redeemscript, *p2sh; |
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size_t i; |
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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> <commit-privkey>\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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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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bitcoin_txid(anchor, &anchor_txid); |
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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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/* This is the scriptPubKey commit tx will have */ |
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p2sh = scriptpubkey_p2sh(ctx, redeemscript); |
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for (i = 0; i < anchor->output_count; i++) { |
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if (anchor->output[i].script_length != tal_count(p2sh)) |
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continue; |
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if (memcmp(anchor->output[i].script, p2sh, tal_count(p2sh)) == 0) |
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break; |
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} |
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if (i == anchor->output_count) |
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errx(1, "No matching output in %s", argv[1]); |
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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, &anchor_txid, i); |
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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, &sig); |
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pkt = close_channel_pkt(ctx, &sig); |
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if (!write_all(STDOUT_FILENO, pkt, |
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sizeof(pkt->len) + le32_to_cpu(pkt->len))) |
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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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@ -0,0 +1,49 @@ |
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#include "close_tx.h" |
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#include "shadouble.h" |
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#include "bitcoin_tx.h" |
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#include "bitcoin_script.h" |
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#include "permute_tx.h" |
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#include "pubkey.h" |
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#include "pkt.h" |
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struct bitcoin_tx *create_close_tx(const tal_t *ctx, |
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OpenChannel *ours, |
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OpenChannel *theirs, |
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const struct sha256_double *anchor_txid, |
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unsigned int anchor_output) |
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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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struct sha256 redeem; |
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/* Now create close tx: one input, two outputs. */ |
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tx = bitcoin_tx(ctx, 1, 2); |
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/* Our input spends the anchor tx output. */ |
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tx->input[0].txid = *anchor_txid; |
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tx->input[0].index = anchor_output; |
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/* Outputs goes to final pubkey */ |
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if (!proto_to_pubkey(ours->final, &ourkey)) |
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return tal_free(tx); |
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if (!proto_to_pubkey(theirs->final, &theirkey)) |
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return tal_free(tx); |
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proto_to_sha256(ours->revocation_hash, &redeem); |
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/* One output is to us. */ |
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tx->output[0].amount = ours->anchor->total - ours->commitment_fee; |
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redeemscript = bitcoin_redeem_single(tx, &ourkey); |
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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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/* Other output is to them. */ |
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tx->output[1].amount = theirs->anchor->total - theirs->commitment_fee; |
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redeemscript = bitcoin_redeem_single(tx, &theirkey); |
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tx->output[1].script = scriptpubkey_p2sh(tx, redeemscript); |
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tx->output[1].script_length = tal_count(tx->output[1].script); |
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permute_outputs(ours->seed, theirs->seed, 1, tx->output, 2, NULL); |
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return tx; |
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} |
@ -0,0 +1,15 @@ |
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#ifndef LIGHTNING_CLOSE_TX_H |
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#define LIGHTNING_CLOSE_TX_H |
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#include <ccan/tal/tal.h> |
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#include "lightning.pb-c.h" |
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struct sha256_double; |
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/* Create close tx to spend the anchor tx output; doesn't fill in
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* input scriptsig. */ |
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struct bitcoin_tx *create_close_tx(const tal_t *ctx, |
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OpenChannel *ours, |
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OpenChannel *theirs, |
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const struct sha256_double *anchor_txid, |
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unsigned int anchor_output); |
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#endif |
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