예제 #1
0
void queue_pkt_close_signature(struct peer *peer)
{
	CloseSignature *c = tal(peer, CloseSignature);
	struct bitcoin_tx *close_tx;
	struct signature our_close_sig;

	close_signature__init(c);
	close_tx = peer_create_close_tx(peer, peer->closing.our_fee);

	peer_sign_mutual_close(peer, close_tx, &our_close_sig);
	c->sig = signature_to_proto(c, peer->dstate->secpctx, &our_close_sig);
	c->close_fee = peer->closing.our_fee;
	log_info(peer->log, "queue_pkt_close_signature: offered close fee %"
		 PRIu64, c->close_fee);

	queue_pkt(peer, PKT__PKT_CLOSE_SIGNATURE, c);
}
예제 #2
0
파일: packets.c 프로젝트: dooglus/lightning
Pkt *accept_pkt_close_sig(struct peer *peer, const Pkt *pkt, bool *acked,
			  bool *we_agree)
{
	const CloseSignature *c = pkt->close_signature;
	struct bitcoin_tx *close_tx;
	struct bitcoin_signature theirsig;

	log_info(peer->log, "accept_pkt_close_sig: they offered close fee %"
		 PRIu64, c->close_fee);
	*acked = *we_agree = false;

	/* BOLT #2:
	 *
	 * The sender MUST set `close_fee` lower than or equal to the fee of the
	 * final commitment transaction, and MUST set `close_fee` to an even
	 * number of satoshis.
	 */
	if ((c->close_fee & 1)
	    || c->close_fee > commit_tx_fee(peer->them.commit->tx,
					    peer->anchor.satoshis)) {
		return pkt_err(peer, "Invalid close fee");
	}

	/* FIXME: Don't accept tiny fee at all? */

	/* BOLT #2:
	   ... otherwise it SHOULD propose a
	   value strictly between the received `close_fee` and its
	   previously-sent `close_fee`.
	*/
	if (peer->closing.their_sig) {
		/* We want more, they should give more. */
		if (peer->closing.our_fee > peer->closing.their_fee) {
			if (c->close_fee <= peer->closing.their_fee)
				return pkt_err(peer, "Didn't increase close fee");
		} else {
			if (c->close_fee >= peer->closing.their_fee)
				return pkt_err(peer, "Didn't decrease close fee");
		}
	}

	/* BOLT #2:
	 *
	 * The receiver MUST check `sig` is valid for the close
	 * transaction, and MUST fail the connection if it is not. */
	theirsig.stype = SIGHASH_ALL;
	if (!proto_to_signature(c->sig, &theirsig.sig))
		return pkt_err(peer, "Invalid signature format");

	close_tx = peer_create_close_tx(peer, c->close_fee);
	if (!check_tx_sig(peer->dstate->secpctx, close_tx, 0,
			  NULL, 0,
			  peer->anchor.witnessscript,
			  &peer->them.commitkey, &theirsig))
		return pkt_err(peer, "Invalid signature");

	tal_free(peer->closing.their_sig);
	peer->closing.their_sig = tal_dup(peer,
					  struct bitcoin_signature, &theirsig);
	peer->closing.their_fee = c->close_fee;

	if (peer->closing.our_fee == peer->closing.their_fee) {
		log_info(peer->log, "accept_pkt_close_sig: That's an ack");
		*acked = true;
	} else {
		/* Adjust our fee to close on their fee. */
		u64 sum;

		/* Beware overflow! */
		sum = (u64)peer->closing.our_fee + peer->closing.their_fee;

		peer->closing.our_fee = sum / 2;
		if (peer->closing.our_fee & 1)
			peer->closing.our_fee++;

		log_info(peer->log, "accept_pkt_close_sig: we change to %"PRIu64,
			 peer->closing.our_fee);

		/* Corner case: we may now agree with them. */
		if (peer->closing.our_fee == peer->closing.their_fee)
			*we_agree = true;
	}

	/* FIXME: Dynamic fee! */
	return NULL;
}