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