Function handle_validate_rbf

lightningd/dual_open_control.c:2499–2589

}

static void handle_validate_rbf(struct subd *dualopend,
				const u8 *msg)
{
	struct wally_psbt *candidate_psbt;
	struct channel_inflight *inflight;
	struct channel *channel = dualopend->channel;
	bool *inputs_present;
	struct amount_sat candidate_fee, last_fee;

	if (!fromwire_dualopend_rbf_validate(tmpctx, msg,
					     &candidate_psbt)) {
		channel_internal_error(channel,
				       "Bad DUALOPEND_RBF_VALIDATE: %s",
				       tal_hex(tmpctx, msg));
		return;
	}

	inputs_present = tal_arr(tmpctx, bool, candidate_psbt->num_inputs);
	memset(inputs_present, true, tal_bytelen(inputs_present));

	/* BOLT #2:
	 *
	 *   - if this is an RBF attempt:
	 *     - MUST fail the negotiation if:
	 *       ...
	 *       - the transaction does not share at least one input with
	 *         each previous funding transaction
	 */
	list_for_each(&channel->inflights, inflight, list) {
		/* Remove every non-matching input from set */
		for (size_t i = 0; i < candidate_psbt->num_inputs; i++) {
			const struct wally_psbt_input *input =
				&candidate_psbt->inputs[i];
			struct bitcoin_outpoint outpoint;

			wally_psbt_input_get_outpoint(input, &outpoint);

			if (!psbt_has_input(inflight->funding_psbt,
					    &outpoint))
				inputs_present[i] = false;
		}
	}

	/* Are there any inputs that were present on all txs? */
	if (memeqzero(inputs_present, tal_bytelen(inputs_present))) {
		char *errmsg;

		inflight = list_tail(&channel->inflights,
				     struct channel_inflight,
				     list);
		assert(inflight);

		errmsg = tal_fmt(tmpctx, "No overlapping input"
				 " present. New: %s, last: %s",
				 fmt_wally_psbt(tmpctx,
						candidate_psbt),
				 fmt_wally_psbt(tmpctx,
						inflight->funding_psbt));