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P2PServer: fixed a data race when banning peers

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pull/277/head
SChernykh 9 months ago
parent 1ef88622d6
commit d8bbe2110e
2 changed files with 27 additions and 16 deletions
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39
src/p2p_server.cpp
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@ -1299,9 +1299,15 @@ void P2PServer::api_update_local_stats()
{
const uint64_t cur_time = seconds_since_epoch();
size_t peer_list_size;
{
MutexLock lock(m_peerListLock);
peer_list_size = m_peerList.size();
}
s << "{\"connections\":" << m_numConnections.load()
<< ",\"incoming_connections\":" << m_numIncomingConnections.load()
<< ",\"peer_list_size\":" << m_peerList.size()
<< ",\"peer_list_size\":" << peer_list_size
<< ",\"peers\":[";
bool first = true;
@ -2474,9 +2480,10 @@ bool P2PServer::P2PClient::handle_incoming_block_async(const PoolBlock* block, u
bool client_isV6;
raw_ip client_ip;
std::vector<hash> missing_blocks;
bool result;
};
Work* work = new Work{ {}, *block, this, server, m_resetCounter.load(), m_isV6, m_addr, {} };
Work* work = new Work{ {}, *block, this, server, m_resetCounter.load(), m_isV6, m_addr, {}, true };
work->req.data = work;
const int err = uv_queue_work(&server->m_loop, &work->req,
@ -2484,12 +2491,12 @@ bool P2PServer::P2PClient::handle_incoming_block_async(const PoolBlock* block, u
{
BACKGROUND_JOB_START(P2PServer::handle_incoming_block_async);
Work* work = reinterpret_cast<Work*>(req->data);
work->client->handle_incoming_block(work->server->m_pool, work->block, work->client_reset_counter, work->client_isV6, work->client_ip, work->missing_blocks);
work->client->handle_incoming_block(work->server->m_pool, work->block, work->missing_blocks, work->result);
},
[](uv_work_t* req, int /*status*/)
{
Work* work = reinterpret_cast<Work*>(req->data);
work->client->post_handle_incoming_block(work->block, work->client_reset_counter, work->missing_blocks);
work->client->post_handle_incoming_block(work->server->m_pool, work->block, work->client_reset_counter, work->client_isV6, work->client_ip, work->missing_blocks, work->result);
delete work;
BACKGROUND_JOB_STOP(P2PServer::handle_incoming_block_async);
});
@ -2503,11 +2510,18 @@ bool P2PServer::P2PClient::handle_incoming_block_async(const PoolBlock* block, u
return true;
}
void P2PServer::P2PClient::handle_incoming_block(p2pool* pool, PoolBlock& block, const uint32_t reset_counter, bool is_v6, const raw_ip& addr, std::vector<hash>& missing_blocks)
void P2PServer::P2PClient::handle_incoming_block(p2pool* pool, PoolBlock& block, std::vector<hash>& missing_blocks, bool& result)
{
result = pool->side_chain().add_external_block(block, missing_blocks);
}
void P2PServer::P2PClient::post_handle_incoming_block(p2pool* pool, const PoolBlock& block, const uint32_t reset_counter, bool is_v6, const raw_ip& addr, std::vector<hash>& missing_blocks, const bool result)
{
if (!pool->side_chain().add_external_block(block, missing_blocks)) {
const uint32_t new_reset_counter = m_resetCounter.load();
if (!result) {
// Client sent bad data, disconnect and ban it
if (reset_counter == m_resetCounter.load()) {
if (reset_counter == new_reset_counter) {
close();
LOGWARN(3, "peer " << static_cast<char*>(m_addrString) << " banned for " << DEFAULT_BAN_TIME << " seconds");
}
@ -2519,13 +2533,10 @@ void P2PServer::P2PClient::handle_incoming_block(p2pool* pool, PoolBlock& block,
server->ban(is_v6, addr, DEFAULT_BAN_TIME);
server->remove_peer_from_list(addr);
}
}
void P2PServer::P2PClient::post_handle_incoming_block(const PoolBlock& block, const uint32_t reset_counter, std::vector<hash>& missing_blocks)
{
// We might have been disconnected while side_chain was adding the block
// In this case we can't send BLOCK_REQUEST messages on this connection anymore
if (reset_counter != m_resetCounter.load()) {
if (reset_counter != new_reset_counter) {
return;
}
@ -2540,7 +2551,7 @@ void P2PServer::P2PClient::post_handle_incoming_block(const PoolBlock& block, co
P2PClient* c = server->m_fastestPeer;
if (c && (c != this) && (c->m_broadcastMaxHeight >= block.m_sidechainHeight)) {
LOGINFO(5, "peer " << static_cast<char*>(c->m_addrString) << " is faster, sending BLOCK_REQUEST to it instead");
c->post_handle_incoming_block(block, c->m_resetCounter.load(), missing_blocks);
c->post_handle_incoming_block(pool, block, c->m_resetCounter.load(), c->m_isV6, c->m_addr, missing_blocks, true);
return;
}
}
@ -2561,7 +2572,7 @@ void P2PServer::P2PClient::post_handle_incoming_block(const PoolBlock& block, co
continue;
}
const bool result = server->send(this,
const bool send_result = server->send(this,
[this, &id](uint8_t* buf, size_t buf_size) -> size_t
{
LOGINFO(5, "[post_handle_incoming_block] sending BLOCK_REQUEST for id = " << id << " to " << static_cast<char*>(m_addrString));
@ -2580,7 +2591,7 @@ void P2PServer::P2PClient::post_handle_incoming_block(const PoolBlock& block, co
return p - buf;
});
if (!result) {
if (!send_result) {
return;
}

4
src/p2p_server.h
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@ -115,8 +115,8 @@ public:
void on_block_notify(const uint8_t* buf);
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, bool is_v6, const raw_ip& addr, std::vector<hash>& missing_blocks);
void post_handle_incoming_block(const PoolBlock& block, const uint32_t reset_counter, std::vector<hash>& missing_blocks);
void handle_incoming_block(p2pool* pool, PoolBlock& block, std::vector<hash>& missing_blocks, bool& result);
void post_handle_incoming_block(p2pool* pool, const PoolBlock& block, const uint32_t reset_counter, bool is_v6, const raw_ip& addr, std::vector<hash>& missing_blocks, const bool result);
bool is_good() const { return m_handshakeComplete && !m_handshakeInvalid && (m_listenPort >= 0); }

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