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daemon: assert that all anchor inputs are witness.

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Otherwise, they're malleable.  We only care about our own anchor:
their anchor is their problem (and they'll probably get away with it).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-04-12 14:17:47 +09:30
parent eb14111cd0
commit 1568774e62
1 changed files with 5 additions and 0 deletions
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daemon/peer.c
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@ -1258,6 +1258,7 @@ static void got_feerate(struct lightningd_state *dstate,
{
u64 fee;
struct bitcoin_tx *tx = bitcoin_tx(peer, 1, 1);
size_t i;
tx->output[0].script = scriptpubkey_p2sh(tx, peer->anchor.redeemscript);
tx->output[0].script_length = tal_count(tx->output[0].script);
@ -1287,6 +1288,10 @@ static void got_feerate(struct lightningd_state *dstate,
/* We'll need this later, when we're told to broadcast it. */
peer->anchor.satoshis = tx->output[0].amount;
/* To avoid malleation, all inputs must be segwit! */
for (i = 0; i < tx->input_count; i++)
assert(tx->input[i].witness);
state_event(peer, BITCOIN_ANCHOR_CREATED, NULL);
}