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https://github.com/ElementsProject/lightning.git
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3260fb2ed1
Both sides elect a commitment fee, and the lowest is chosen. That means you can't game the other side (but if you offer too low, then can error out of course). Fees are split 50-50 if possible: originally the whole fee has to be paid by the (single) funder. Neither side can withdraw funds which would make them unable to pay fees. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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 "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 "commit_tx.h"
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#include "bitcoin/pubkey.h"
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#include "bitcoin/privkey.h"
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#include "find_p2sh_out.h"
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#include "protobuf_convert.h"
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#include "gather_updates.h"
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#include "funding.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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struct sha256 seed, revocation_hash, their_rhash;
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OpenChannel *o1, *o2;
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OpenAnchor *a;
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struct bitcoin_tx *commit;
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struct pkt *pkt;
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struct bitcoin_signature sig;
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struct privkey privkey;
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bool testnet;
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uint64_t num_updates;
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struct pubkey pubkey1, pubkey2;
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u8 *redeemscript;
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uint64_t our_amount, their_amount;
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err_set_progname(argv[0]);
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opt_register_noarg("--help|-h", opt_usage_and_exit,
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"<seed> <open-channel-file1> <open-channel-file2> <open-anchor-file> <commit-privkey> <all-updates...>\n"
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"Accept a new update message",
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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 < 7)
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opt_usage_exit_fail("Expected 6+ arguments");
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if (!hex_decode(argv[1], strlen(argv[1]), &seed, sizeof(seed)))
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errx(1, "Invalid seed '%s' - need 256 hex bits", 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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a = pkt_from_file(argv[4], PKT__PKT_OPEN_ANCHOR)->open_anchor;
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if (!key_from_base58(argv[5], strlen(argv[5]), &testnet, &privkey, &pubkey1))
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errx(1, "Invalid private key '%s'", argv[5]);
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if (!testnet)
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errx(1, "Private key '%s' not on testnet!", argv[5]);
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/* Figure out cumulative delta since anchor. */
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num_updates = gather_updates(o1, o2, a, commit_fee(o1, o2), argv + 6,
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&our_amount, &their_amount,
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NULL, &their_rhash, NULL);
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/* Get next revocation hash. */
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shachain_from_seed(&seed, num_updates, &revocation_hash);
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sha256(&revocation_hash,
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revocation_hash.u.u8, sizeof(revocation_hash.u.u8));
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/* Get pubkeys */
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if (!proto_to_pubkey(o1->commit_key, &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->commit_key, &pubkey2))
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errx(1, "Invalid o2 commit 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 THEIR new commitment tx to spend 2/2 output of anchor. */
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commit = create_commit_tx(ctx, o2, o1, a, &their_rhash,
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their_amount, our_amount);
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/* If contributions don't exceed fees, this fails. */
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if (!commit)
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errx(1, "Delta too large");
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/* Sign it for them. */
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sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
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&privkey, &pubkey1, &sig.sig);
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pkt = update_accept_pkt(ctx, &sig.sig, &revocation_hash);
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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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