2021-08-22 04:20:59 -06:00
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/*
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* This file is part of the Monero P2Pool <https://github.com/SChernykh/p2pool>
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2022-03-30 06:42:26 -06:00
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* Copyright (c) 2021-2022 SChernykh <https://github.com/SChernykh>
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2021-08-22 04:20:59 -06:00
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "tcp_server.h"
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namespace p2pool {
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class p2pool;
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struct PoolBlock;
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class BlockCache;
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static constexpr size_t P2P_BUF_SIZE = 128 * 1024;
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static constexpr size_t PEER_LIST_RESPONSE_MAX_PEERS = 16;
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static constexpr int DEFAULT_P2P_PORT = 37889;
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static constexpr int DEFAULT_P2P_PORT_MINI = 37888;
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class P2PServer : public TCPServer<P2P_BUF_SIZE, P2P_BUF_SIZE>
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{
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public:
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enum class MessageId {
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HANDSHAKE_CHALLENGE = 0,
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HANDSHAKE_SOLUTION = 1,
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LISTEN_PORT = 2,
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BLOCK_REQUEST = 3,
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BLOCK_RESPONSE = 4,
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BLOCK_BROADCAST = 5,
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PEER_LIST_REQUEST = 6,
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PEER_LIST_RESPONSE = 7,
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};
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explicit P2PServer(p2pool *pool);
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~P2PServer();
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void add_cached_block(const PoolBlock& block);
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void clear_cached_blocks();
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void store_in_cache(const PoolBlock& block);
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2021-08-22 04:20:59 -06:00
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void connect_to_peers(const std::string& peer_list);
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void on_connect_failed(bool is_v6, const raw_ip& ip, int port) override;
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struct P2PClient : public Client
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{
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P2PClient();
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~P2PClient();
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static Client* allocate() { return new P2PClient(); }
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void reset() override;
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bool on_connect() override;
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bool on_read(char* data, uint32_t size) override;
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void on_read_failed(int err) override;
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void on_disconnected() override;
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// Both peers send handshake challenge immediately after a connection is established
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// Both peers must have the same consensus ID for handshake to succeed
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// Consensus ID is never sent over the network
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//
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// Handshake sequence:
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//
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// - Both peers send 8-byte random challenges (and 8 bytes of peer ID) to each other
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// - Each peer receives 8-byte challenge, chooses 8-byte random SALT and calculates H = KECCAK(CHALLENGE|CONSENSUS_ID|SALT)
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// - Both peers send their H and SALT, calculate H of the other peer and check if it matches with what other peer calculated
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// - Peer that initiated the connection must also provide enough PoW in H (difficulty = 10000, 5-10 ms on modern CPU)
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// - If H doesn't match or doesn't have enough PoW, connection is closed immediately
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enum {
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CHALLENGE_SIZE = 8,
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CHALLENGE_DIFFICULTY = 10000,
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};
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bool send_handshake_challenge();
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void send_handshake_solution(const uint8_t (&challenge)[CHALLENGE_SIZE]);
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bool check_handshake_solution(const hash& solution, const uint8_t (&solution_salt)[CHALLENGE_SIZE]);
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bool on_handshake_challenge(const uint8_t* buf);
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bool on_handshake_solution(const uint8_t* buf);
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void on_after_handshake(uint8_t* &p);
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bool on_listen_port(const uint8_t* buf);
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bool on_block_request(const uint8_t* buf);
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bool on_block_response(const uint8_t* buf, uint32_t size);
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bool on_block_broadcast(const uint8_t* buf, uint32_t size);
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bool on_peer_list_request(const uint8_t* buf);
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bool on_peer_list_response(const uint8_t* buf) const;
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bool handle_incoming_block_async(PoolBlock* block);
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void handle_incoming_block(p2pool* pool, PoolBlock& block, const uint32_t reset_counter, const raw_ip& addr, std::vector<hash>& missing_blocks);
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void post_handle_incoming_block(const uint32_t reset_counter, std::vector<hash>& missing_blocks);
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uint64_t m_peerId;
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MessageId m_expectedMessage;
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uint64_t m_handshakeChallenge;
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bool m_handshakeSolutionSent;
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bool m_handshakeComplete;
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bool m_handshakeInvalid;
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int m_listenPort;
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2022-02-22 03:06:12 -07:00
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uint32_t m_fastPeerListRequestCount;
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uint64_t m_prevIncomingPeerListRequest;
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uint64_t m_nextOutgoingPeerListRequest;
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std::chrono::high_resolution_clock::time_point m_lastPeerListRequestTime;
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int m_peerListPendingRequests;
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int64_t m_pingTime;
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2022-02-21 08:54:53 -07:00
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int m_blockPendingRequests;
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2022-03-23 04:30:38 -06:00
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uint64_t m_lastAlive;
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uint64_t m_lastBroadcastTimestamp;
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uint64_t m_lastBlockrequestTimestamp;
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2021-10-17 02:48:09 -06:00
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hash m_broadcastedHashes[8];
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std::atomic<uint32_t> m_broadcastedHashesIndex{ 0 };
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};
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void broadcast(const PoolBlock& block);
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uint64_t get_random64();
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uint64_t get_peerId() const { return m_peerId; }
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void print_status() override;
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void show_peers();
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size_t peer_list_size() const { return m_peerList.size(); }
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uint32_t max_outgoing_peers() const { return m_maxOutgoingPeers; }
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uint32_t max_incoming_peers() const { return m_maxIncomingPeers; }
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void set_max_outgoing_peers(uint32_t n) { m_maxOutgoingPeers = std::min(std::max(n, 10U), 1000U); }
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void set_max_incoming_peers(uint32_t n) { m_maxIncomingPeers = std::min(std::max(n, 10U), 1000U); }
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private:
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p2pool* m_pool;
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BlockCache* m_cache;
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bool m_cacheLoaded;
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std::string m_initialPeerList;
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uint32_t m_maxOutgoingPeers;
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uint32_t m_maxIncomingPeers;
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uv_rwlock_t m_cachedBlocksLock;
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unordered_map<hash, PoolBlock*>* m_cachedBlocks;
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private:
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static void on_timer(uv_timer_t* timer) { reinterpret_cast<P2PServer*>(timer->data)->on_timer(); }
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void on_timer();
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void flush_cache();
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void download_missing_blocks();
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void check_zmq();
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void update_peer_connections();
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void update_peer_list();
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void save_peer_list_async();
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void save_peer_list();
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void load_peer_list();
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void load_monerod_peer_list();
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void update_peer_in_list(bool is_v6, const raw_ip& ip, int port);
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void remove_peer_from_list(P2PClient* client);
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void remove_peer_from_list(const raw_ip& ip);
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uv_mutex_t m_rngLock;
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std::mt19937_64 m_rng;
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uv_mutex_t m_blockLock;
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PoolBlock* m_block;
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uv_timer_t m_timer;
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uint64_t m_timerCounter;
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uint64_t m_timerInterval;
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uint64_t m_peerId;
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uv_mutex_t m_peerListLock;
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struct Peer
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{
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bool m_isV6;
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raw_ip m_addr;
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int m_port;
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uint32_t m_numFailedConnections;
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uint64_t m_lastSeen;
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};
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std::vector<Peer> m_peerList;
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std::vector<Peer> m_peerListMonero;
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uint64_t m_peerListLastSaved;
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struct Broadcast
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{
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std::vector<uint8_t> blob;
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std::vector<uint8_t> pruned_blob;
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std::vector<hash> ancestor_hashes;
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};
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uv_mutex_t m_broadcastLock;
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uv_async_t m_broadcastAsync;
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std::vector<Broadcast*> m_broadcastQueue;
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uv_mutex_t m_missingBlockRequestsLock;
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unordered_set<std::pair<uint64_t, uint64_t>> m_missingBlockRequests;
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static void on_broadcast(uv_async_t* handle) { reinterpret_cast<P2PServer*>(handle->data)->on_broadcast(); }
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void on_broadcast();
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};
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} // namespace p2pool
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