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P2PServer: sanity check for timestamps

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SChernykh 2022-11-02 18:41:16 +01:00
parent b667f88d0e
commit 732190bb11
2 changed files with 29 additions and 4 deletions
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31
src/p2p_server.cpp
View file

@ -1871,7 +1871,10 @@ bool P2PServer::P2PClient::on_block_response(const uint8_t* buf, uint32_t size)
}
}
return handle_incoming_block_async(server->get_block());
const SideChain& side_chain = server->m_pool->side_chain();
const uint64_t max_time_delta = side_chain.precalcFinished() ? (side_chain.block_time() * side_chain.chain_window_size() * 4) : 0;
return handle_incoming_block_async(server->get_block(), max_time_delta);
}
bool P2PServer::P2PClient::on_block_broadcast(const uint8_t* buf, uint32_t size)
@ -1933,7 +1936,7 @@ bool P2PServer::P2PClient::on_block_broadcast(const uint8_t* buf, uint32_t size)
m_lastBroadcastTimestamp = seconds_since_epoch();
return handle_incoming_block_async(block);
return handle_incoming_block_async(block, 1800);
}
bool P2PServer::P2PClient::on_peer_list_request(const uint8_t*)
@ -2058,10 +2061,32 @@ bool P2PServer::P2PClient::on_peer_list_response(const uint8_t* buf) const
return true;
}
bool P2PServer::P2PClient::handle_incoming_block_async(const PoolBlock* block)
bool P2PServer::P2PClient::handle_incoming_block_async(const PoolBlock* block, uint64_t max_time_delta)
{
P2PServer* server = static_cast<P2PServer*>(m_owner);
// Limit system clock difference between connected peers
if (max_time_delta) {
static uint32_t total_checks = 0;
static uint32_t failed_checks = 0;
++total_checks;
const uint64_t t = time(nullptr);
if ((block->m_timestamp + max_time_delta < t) || (block->m_timestamp > t + max_time_delta)) {
LOGWARN(4, "peer " << static_cast<char*>(m_addrString)
<< " sent a block with an invalid timestamp " << block->m_timestamp
<< " (your local timestamp is " << t << ")");
++failed_checks;
if ((total_checks > 10) && (failed_checks * 4 > total_checks * 3)) {
LOGWARN(1, "Your system clock might be invalid: " << failed_checks << " of " << total_checks << " blocks were rejected due to timestamp difference");
}
return true;
}
}
if (server->m_pool->side_chain().block_seen(*block)) {
LOGINFO(6, "block " << block->m_sidechainId << " (nonce " << block->m_nonce << ", extra_nonce " << block->m_extraNonce << ") was received before, skipping it");
return true;

2
src/p2p_server.h
View file

@ -98,7 +98,7 @@ public:
bool on_peer_list_request(const uint8_t* buf);
bool on_peer_list_response(const uint8_t* buf) const;
bool handle_incoming_block_async(const PoolBlock* block);
bool handle_incoming_block_async(const PoolBlock* block, uint64_t max_time_delta = 0);
void handle_incoming_block(p2pool* pool, PoolBlock& block, const uint32_t reset_counter, const raw_ip& addr, std::vector<hash>& missing_blocks);
void post_handle_incoming_block(const uint32_t reset_counter, std::vector<hash>& missing_blocks);