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SideChain: stricter checks of alternative chains

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SChernykh 2023-03-24 11:50:39 +01:00
parent c0586a5089
commit eef90da7ae
1 changed files with 40 additions and 4 deletions
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44
src/side_chain.cpp
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@ -1776,11 +1776,32 @@ bool SideChain::is_longer_chain(const PoolBlock* block, const PoolBlock* candida
uint64_t candidate_mainchain_height = 0;
uint64_t candidate_mainchain_min_height = 0;
hash mainchain_prev_id;
unordered_set<hash> current_chain_monero_blocks, candidate_chain_monero_blocks;
{
const uint64_t k = m_chainWindowSize * m_targetBlockTime * 2 / MONERO_BLOCK_TIME;
current_chain_monero_blocks.reserve(k);
candidate_chain_monero_blocks.reserve(k);
}
for (uint64_t i = 0; (i < m_chainWindowSize) && (old_chain || new_chain); ++i) {
if (old_chain) {
block_total_diff += old_chain->m_difficulty;
for (const hash& uncle : old_chain->m_uncles) {
auto it = m_blocksById.find(uncle);
if (it != m_blocksById.end()) {
block_total_diff += it->second->m_difficulty;
}
}
ChainMain data;
const hash& h = old_chain->m_prevId;
if ((current_chain_monero_blocks.count(h) == 0) && m_pool->chainmain_get_by_hash(h, data)) {
current_chain_monero_blocks.insert(h);
}
old_chain = get_parent(old_chain);
}
@ -1788,9 +1809,18 @@ bool SideChain::is_longer_chain(const PoolBlock* block, const PoolBlock* candida
candidate_mainchain_min_height = candidate_mainchain_min_height ? std::min(candidate_mainchain_min_height, new_chain->m_txinGenHeight) : new_chain->m_txinGenHeight;
candidate_total_diff += new_chain->m_difficulty;
for (const hash& uncle : new_chain->m_uncles) {
auto it = m_blocksById.find(uncle);
if (it != m_blocksById.end()) {
candidate_total_diff += it->second->m_difficulty;
}
}
ChainMain data;
if ((new_chain->m_prevId != mainchain_prev_id) && m_pool->chainmain_get_by_hash(new_chain->m_prevId, data)) {
mainchain_prev_id = new_chain->m_prevId;
const hash& h = new_chain->m_prevId;
if ((candidate_chain_monero_blocks.count(h) == 0) && m_pool->chainmain_get_by_hash(h, data)) {
candidate_chain_monero_blocks.insert(h);
candidate_mainchain_height = std::max(candidate_mainchain_height, data.height);
}
@ -1802,7 +1832,7 @@ bool SideChain::is_longer_chain(const PoolBlock* block, const PoolBlock* candida
return false;
}
// Final check: candidate chain must be built on top of recent mainchain blocks
// Candidate chain must be built on top of recent mainchain blocks
MinerData data = m_pool->miner_data();
if (candidate_mainchain_height + 10 < data.height) {
LOGWARN(3, "received a longer alternative chain but it's stale: height " << candidate_mainchain_height << ", current height " << data.height);
@ -1815,6 +1845,12 @@ bool SideChain::is_longer_chain(const PoolBlock* block, const PoolBlock* candida
return false;
}
// Candidate chain must have been mined on top of at least half as many known Monero blocks, compared to the current chain
if (candidate_chain_monero_blocks.size() * 2 < current_chain_monero_blocks.size()) {
LOGWARN(3, "received a longer alternative chain but it wasn't mined on current Monero blockchain: only " << candidate_chain_monero_blocks.size() << '/' << current_chain_monero_blocks.size() << " blocks found");
return false;
}
LOGINFO(3, "received a longer alternative chain: height " <<
log::Gray() << block->m_sidechainHeight << log::NoColor() << " -> " <<
log::Gray() << candidate->m_sidechainHeight << log::NoColor() << ", cumulative difficulty " <<