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blockchain: on hardfork 2, require mixin 2 at least if possible

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moneromooo-monero 2015-09-26 17:57:01 +01:00
parent 434e0f42e7
commit 33affd2d17
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37
src/cryptonote_core/blockchain.cpp
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@ -1998,6 +1998,43 @@ bool Blockchain::check_tx_inputs(const transaction& tx, uint64_t* pmax_used_bloc
return true;
}
// from hard fork 2, we require mixin at least 2 unless one output cannot mix with 2 others
// if one output cannot mix with 2 others, we accept at most 1 output that can mix
if (m_hardfork->get_current_version() >= 2)
{
size_t n_unmixable = 0, n_mixable = 0;
size_t mixin = std::numeric_limits<size_t>::max();
for (const auto& txin : tx.vin)
{
// non txin_to_key inputs will be rejected below
if (txin.type() == typeid(txin_to_key))
{
const txin_to_key& in_to_key = boost::get<txin_to_key>(txin);
uint64_t n_outputs = m_db->get_num_outputs(in_to_key.amount);
// n_outputs includes the output we're considering
if (n_outputs <= 2)
++n_unmixable;
else
++n_mixable;
if (in_to_key.key_offsets.size() - 1 < mixin)
mixin = in_to_key.key_offsets.size() - 1;
}
}
if (mixin < 2)
{
if (n_unmixable == 0)
{
LOG_PRINT_L1("Tx " << get_transaction_hash(tx) << " has too low mixin (" << mixin << "), and no unmixable inputs");
return false;
}
if (n_mixable > 1)
{
LOG_PRINT_L1("Tx " << get_transaction_hash(tx) << " has too low mixin (" << mixin << "), and more than one mixable input with unmixable inputs");
return false;
}
}
}
auto it = m_check_txin_table.find(tx_prefix_hash);
if(it == m_check_txin_table.end())
{