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| 1 | +/** |
| 2 | + * Copyright (c) 2011-2026 libbitcoin developers (see AUTHORS) |
| 3 | + * |
| 4 | + * This file is part of libbitcoin. |
| 5 | + * |
| 6 | + * This program is free software: you can redistribute it and/or modify |
| 7 | + * it under the terms of the GNU Affero General Public License as published by |
| 8 | + * the Free Software Foundation, either version 3 of the License, or |
| 9 | + * (at your option) any later version. |
| 10 | + * |
| 11 | + * This program is distributed in the hope that it will be useful, |
| 12 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | + * GNU Affero General Public License for more details. |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU Affero General Public License |
| 17 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | + */ |
| 19 | + |
| 20 | +#ifndef LIBBITCOIN_NODE_SESSIONS_SESSION_PEER_IPP |
| 21 | +#define LIBBITCOIN_NODE_SESSIONS_SESSION_PEER_IPP |
| 22 | + |
| 23 | +namespace libbitcoin { |
| 24 | +namespace node { |
| 25 | + |
| 26 | +// this-> is required for dependent base access in CRTP. |
| 27 | + |
| 28 | +TEMPLATE |
| 29 | +inline CLASS::channel_ptr CLASS::create_channel( |
| 30 | + const socket_ptr& socket) NOEXCEPT |
| 31 | +{ |
| 32 | + BC_ASSERT(this->stranded()); |
| 33 | + |
| 34 | + const auto channel = system::emplace_shared<channel_t>( |
| 35 | + this->get_memory(), this->log, socket, this->create_key(), |
| 36 | + this->node_config(), this->options()); |
| 37 | + |
| 38 | + return std::static_pointer_cast<network::channel>(channel); |
| 39 | +} |
| 40 | + |
| 41 | +TEMPLATE |
| 42 | +inline void CLASS::attach_handshake(const channel_ptr& channel, |
| 43 | + network::result_handler&& handler) NOEXCEPT |
| 44 | +{ |
| 45 | + BC_ASSERT(channel->stranded()); |
| 46 | + BC_ASSERT(channel->paused()); |
| 47 | + |
| 48 | + // Set the current top for version protocol, before handshake. |
| 49 | + const auto top = this->archive().get_top_confirmed(); |
| 50 | + const auto peer = std::dynamic_pointer_cast<channel_t>(channel); |
| 51 | + peer->set_start_height(top); |
| 52 | + |
| 53 | + // Attach and execute appropriate version protocol. |
| 54 | + NetworkSession::attach_handshake(channel, std::move(handler)); |
| 55 | +} |
| 56 | + |
| 57 | +TEMPLATE |
| 58 | +inline void CLASS::attach_protocols(const channel_ptr& channel) NOEXCEPT |
| 59 | +{ |
| 60 | + BC_ASSERT(channel->stranded()); |
| 61 | + BC_ASSERT(channel->paused()); |
| 62 | + |
| 63 | + using namespace system; |
| 64 | + using namespace network; |
| 65 | + using namespace network::messages::peer; |
| 66 | + using base = session_peer<NetworkSession>; |
| 67 | + |
| 68 | + const auto self = this->template shared_from_base<base>(); |
| 69 | + const auto relay = this->network_settings().enable_relay; |
| 70 | + const auto delay = this->node_settings().delay_inbound; |
| 71 | + const auto headers = this->node_settings().headers_first; |
| 72 | + const auto node_network = to_bool(bit_and<uint64_t> |
| 73 | + ( |
| 74 | + this->network_settings().services_maximum, |
| 75 | + service::node_network |
| 76 | + )); |
| 77 | + const auto node_client_filters = to_bool(bit_and<uint64_t> |
| 78 | + ( |
| 79 | + this->network_settings().services_maximum, |
| 80 | + service::node_client_filters |
| 81 | + )); |
| 82 | + |
| 83 | + // Attach appropriate alert, reject, ping, and/or address protocols. |
| 84 | + NetworkSession::attach_protocols(channel); |
| 85 | + |
| 86 | + // Channel suspensions. |
| 87 | + channel-> attach<protocol_observer>(self)-> start(); |
| 88 | + |
| 89 | + // Ready to relay blocks or block filters. |
| 90 | + const auto blocks_out = !delay || this->is_recent(); |
| 91 | + |
| 92 | + /////////////////////////////////////////////////////////////////////// |
| 93 | + // bip152: "Upon receipt of a `sendcmpct` message with the first and |
| 94 | + // second integers set to 1, the node SHOULD announce new blocks by |
| 95 | + // sending a cmpctblock message." IOW at 70014 bip152 is optional. |
| 96 | + // This allows the node to support bip157 without supporting bip152. |
| 97 | + /////////////////////////////////////////////////////////////////////// |
| 98 | + |
| 99 | + const auto peer = std::dynamic_pointer_cast<channel_t>(channel); |
| 100 | + |
| 101 | + // Node must advertise node_client_filters or no out filters. |
| 102 | + if (node_client_filters && blocks_out && |
| 103 | + peer->is_negotiated(level::bip157)) |
| 104 | + channel-> attach<protocol_filter_out_70015>(self)-> start(); |
| 105 | + |
| 106 | + // Node must advertise node_network or no in|out blocks|txs. |
| 107 | + if (!node_network) |
| 108 | + return; |
| 109 | + |
| 110 | + // Ready to relay transactions. |
| 111 | + const auto txs_in_out = relay && peer->is_negotiated(level::bip37) && |
| 112 | + (!delay || is_current(true)); |
| 113 | + |
| 114 | + // Peer advertises chain (blocks in). |
| 115 | + if (peer->is_peer_service(service::node_network)) |
| 116 | + { |
| 117 | + if (headers && peer->is_negotiated(level::bip130)) |
| 118 | + { |
| 119 | + channel-> attach<protocol_header_in_70012>(self)-> start(); |
| 120 | + channel-> attach<protocol_block_in_31800>(self)-> start(); |
| 121 | + |
| 122 | + } |
| 123 | + else if (headers && peer->is_negotiated(level::headers_protocol)) |
| 124 | + { |
| 125 | + channel-> attach<protocol_header_in_31800>(self)-> start(); |
| 126 | + channel-> attach<protocol_block_in_31800>(self)-> start(); |
| 127 | + } |
| 128 | + else |
| 129 | + { |
| 130 | + // Very hard to find < 31800 peer to connect with. |
| 131 | + // Blocks-first synchronization (not base of block_in_31800). |
| 132 | + channel-> attach<protocol_block_in_106>(self)-> start(); |
| 133 | + } |
| 134 | + } |
| 135 | + |
| 136 | + // Blocks are ready (blocks out). |
| 137 | + if (blocks_out) |
| 138 | + { |
| 139 | + if (headers && peer->is_negotiated(level::bip130)) |
| 140 | + { |
| 141 | + channel-> attach<protocol_header_out_70012>(self)-> start(); |
| 142 | + channel-> attach<protocol_block_out_70012>(self)-> start(); |
| 143 | + } |
| 144 | + else if (headers && peer->is_negotiated(level::headers_protocol)) |
| 145 | + { |
| 146 | + channel-> attach<protocol_header_out_31800>(self)-> start(); |
| 147 | + channel-> attach<protocol_block_out_106>(self)-> start(); |
| 148 | + } |
| 149 | + else |
| 150 | + { |
| 151 | + channel-> attach<protocol_block_out_106>(self)-> start(); |
| 152 | + } |
| 153 | + } |
| 154 | + |
| 155 | + // Relay is configured, active, and txs are ready (txs in/out). |
| 156 | + if (txs_in_out) |
| 157 | + { |
| 158 | + if (peer->peer_version()->relay) |
| 159 | + channel-> attach<protocol_transaction_out_106>(self)-> start(); |
| 160 | + } |
| 161 | +} |
| 162 | + |
| 163 | +} // namespace node |
| 164 | +} // namespace libbitcoin |
| 165 | + |
| 166 | +#endif |
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