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onchaind: fix feerate determination.

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There were two bugs here.  First, grind_feerate() needs to check the
actual range of feerates, not the same rate over and over!  Secondly,
we need to grind the feerate for the HTLC-success tx, too.

These were masked by the fact that our tests always use the same feerate!
"Untested code is buggy code"

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-11-17 13:47:48 +10:30 committed by Christian Decker
parent 5281541ec6
commit 9b42f49d2c
1 changed files with 19 additions and 2 deletions
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21
onchaind/onchain.c
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@ -163,7 +163,7 @@ static bool grind_feerate(struct bitcoin_tx *commit_tx,
u64 input_amount = *commit_tx->input[0].amount;
for (s64 i = feerate_range.max; i >= feerate_range.min; i--) {
u64 fee = feerate_per_kw * multiplier / 1000;
u64 fee = i * multiplier / 1000;
if (fee > input_amount)
continue;
@ -873,8 +873,25 @@ static void handle_preimage(struct tracked_output **outs,
outs[i]->outnum,
outs[i]->satoshi * 1000,
to_self_delay[LOCAL],
feerate_per_kw,
0,
keyset);
/* BOLT #3:
*
* The fee for an HTLC-success transaction MUST BE
* calculated to match:
*
* 1. Multiply `feerate_per_kw` by 703 and divide by
* 1000 (rounding down).
*/
if (!grind_feerate(tx, outs[i]->remote_htlc_sig,
outs[i]->wscript, 703))
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Could not find feerate for"
" signature on HTLC success"
" between %u and %u",
feerate_range.min,
feerate_range.max);
sign_tx_input(tx, 0, NULL, outs[i]->wscript,
&htlc_privkey,
&keyset->self_htlc_key,