/*************************************************************************/ /* networked_multiplayer_enet.cpp */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ /* "Software"), to deal in the Software without restriction, including */ /* without limitation the rights to use, copy, modify, merge, publish, */ /* distribute, sublicense, and/or sell copies of the Software, and to */ /* permit persons to whom the Software is furnished to do so, subject to */ /* the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /*************************************************************************/ #include "networked_multiplayer_enet.h" #include "io/marshalls.h" #include "os/os.h" void NetworkedMultiplayerENet::set_transfer_mode(TransferMode p_mode) { transfer_mode = p_mode; } NetworkedMultiplayerPeer::TransferMode NetworkedMultiplayerENet::get_transfer_mode() const { return transfer_mode; } void NetworkedMultiplayerENet::set_target_peer(int p_peer) { target_peer = p_peer; } int NetworkedMultiplayerENet::get_packet_peer() const { ERR_FAIL_COND_V(!active, 1); ERR_FAIL_COND_V(incoming_packets.size() == 0, 1); return incoming_packets.front()->get().from; } Error NetworkedMultiplayerENet::create_server(int p_port, int p_max_clients, int p_in_bandwidth, int p_out_bandwidth) { ERR_FAIL_COND_V(active, ERR_ALREADY_IN_USE); ENetAddress address; #ifdef GODOT_ENET if (bind_ip.is_wildcard()) { address.wildcard = 1; } else { enet_address_set_ip(&address, bind_ip.get_ipv6(), 16); } #else if (bind_ip.is_wildcard()) { address.host = 0; } else { ERR_FAIL_COND_V(!bind_ip.is_ipv4(), ERR_INVALID_PARAMETER); address.host = *(uint32_t *)bind_ip.get_ipv4(); } #endif address.port = p_port; host = enet_host_create(&address /* the address to bind the server host to */, p_max_clients /* allow up to 32 clients and/or outgoing connections */, SYSCH_MAX /* allow up to SYSCH_MAX channels to be used */, p_in_bandwidth /* assume any amount of incoming bandwidth */, p_out_bandwidth /* assume any amount of outgoing bandwidth */); ERR_FAIL_COND_V(!host, ERR_CANT_CREATE); _setup_compressor(); active = true; server = true; refuse_connections = false; unique_id = 1; connection_status = CONNECTION_CONNECTED; return OK; } Error NetworkedMultiplayerENet::create_client(const IP_Address &p_ip, int p_port, int p_in_bandwidth, int p_out_bandwidth) { ERR_FAIL_COND_V(active, ERR_ALREADY_IN_USE); host = enet_host_create(NULL /* create a client host */, 1 /* only allow 1 outgoing connection */, SYSCH_MAX /* allow up to SYSCH_MAX channels to be used */, p_in_bandwidth /* 56K modem with 56 Kbps downstream bandwidth */, p_out_bandwidth /* 56K modem with 14 Kbps upstream bandwidth */); ERR_FAIL_COND_V(!host, ERR_CANT_CREATE); _setup_compressor(); ENetAddress address; #ifdef GODOT_ENET enet_address_set_ip(&address, p_ip.get_ipv6(), 16); #else ERR_FAIL_COND_V(!p_ip.is_ipv4(), ERR_INVALID_PARAMETER); address.host = *(uint32_t *)p_ip.get_ipv4(); #endif address.port = p_port; //enet_address_set_host (& address, "localhost"); //address.port = p_port; unique_id = _gen_unique_id(); /* Initiate the connection, allocating the enough channels */ ENetPeer *peer = enet_host_connect(host, &address, SYSCH_MAX, unique_id); if (peer == NULL) { enet_host_destroy(host); ERR_FAIL_COND_V(!peer, ERR_CANT_CREATE); } //technically safe to ignore the peer or anything else. connection_status = CONNECTION_CONNECTING; active = true; server = false; refuse_connections = false; return OK; } void NetworkedMultiplayerENet::poll() { ERR_FAIL_COND(!active); _pop_current_packet(); ENetEvent event; /* Wait up to 1000 milliseconds for an event. */ while (true) { if (!host || !active) //might have been disconnected while emitting a notification return; int ret = enet_host_service(host, &event, 1); if (ret < 0) { //error, do something? break; } else if (ret == 0) { break; } switch (event.type) { case ENET_EVENT_TYPE_CONNECT: { /* Store any relevant client information here. */ if (server && refuse_connections) { enet_peer_reset(event.peer); break; } int *new_id = memnew(int); *new_id = event.data; if (*new_id == 0) { //data zero is sent by server (enet won't let you configure this). Server is always 1 *new_id = 1; } event.peer->data = new_id; peer_map[*new_id] = event.peer; connection_status = CONNECTION_CONNECTED; //if connecting, this means it connected t something! emit_signal("peer_connected", *new_id); if (server) { //someone connected, let it know of all the peers available for (Map::Element *E = peer_map.front(); E; E = E->next()) { if (E->key() == *new_id) continue; //send existing peers to new peer ENetPacket *packet = enet_packet_create(NULL, 8, ENET_PACKET_FLAG_RELIABLE); encode_uint32(SYSMSG_ADD_PEER, &packet->data[0]); encode_uint32(E->key(), &packet->data[4]); enet_peer_send(event.peer, SYSCH_CONFIG, packet); //send the new peer to existing peers packet = enet_packet_create(NULL, 8, ENET_PACKET_FLAG_RELIABLE); encode_uint32(SYSMSG_ADD_PEER, &packet->data[0]); encode_uint32(*new_id, &packet->data[4]); enet_peer_send(E->get(), SYSCH_CONFIG, packet); } } else { emit_signal("connection_succeeded"); } } break; case ENET_EVENT_TYPE_DISCONNECT: { /* Reset the peer's client information. */ int *id = (int *)event.peer->data; if (!id) { if (!server) { emit_signal("connection_failed"); } } else { if (server) { //someone disconnected, let it know to everyone else for (Map::Element *E = peer_map.front(); E; E = E->next()) { if (E->key() == *id) continue; //send the new peer to existing peers ENetPacket *packet = enet_packet_create(NULL, 8, ENET_PACKET_FLAG_RELIABLE); encode_uint32(SYSMSG_REMOVE_PEER, &packet->data[0]); encode_uint32(*id, &packet->data[4]); enet_peer_send(E->get(), SYSCH_CONFIG, packet); } } else if (!server) { emit_signal("server_disconnected"); close_connection(); return; } emit_signal("peer_disconnected", *id); peer_map.erase(*id); memdelete(id); } } break; case ENET_EVENT_TYPE_RECEIVE: { if (event.channelID == SYSCH_CONFIG) { //some config message ERR_CONTINUE(event.packet->dataLength < 8); // Only server can send config messages ERR_CONTINUE(server); int msg = decode_uint32(&event.packet->data[0]); int id = decode_uint32(&event.packet->data[4]); switch (msg) { case SYSMSG_ADD_PEER: { peer_map[id] = NULL; emit_signal("peer_connected", id); } break; case SYSMSG_REMOVE_PEER: { peer_map.erase(id); emit_signal("peer_disconnected", id); } break; } enet_packet_destroy(event.packet); } else if (event.channelID < SYSCH_MAX) { Packet packet; packet.packet = event.packet; uint32_t *id = (uint32_t *)event.peer->data; ERR_CONTINUE(event.packet->dataLength < 12) uint32_t source = decode_uint32(&event.packet->data[0]); int target = decode_uint32(&event.packet->data[4]); uint32_t flags = decode_uint32(&event.packet->data[8]); packet.from = source; if (server) { // Someone is cheating and trying to fake the source! ERR_CONTINUE(source != *id); packet.from = *id; if (target == 0) { //re-send the everyone but sender :| incoming_packets.push_back(packet); //and make copies for sending for (Map::Element *E = peer_map.front(); E; E = E->next()) { if (uint32_t(E->key()) == source) //do not resend to self continue; ENetPacket *packet2 = enet_packet_create(packet.packet->data, packet.packet->dataLength, flags); enet_peer_send(E->get(), event.channelID, packet2); } } else if (target < 0) { //to all but one //and make copies for sending for (Map::Element *E = peer_map.front(); E; E = E->next()) { if (uint32_t(E->key()) == source || E->key() == -target) //do not resend to self, also do not send to excluded continue; ENetPacket *packet2 = enet_packet_create(packet.packet->data, packet.packet->dataLength, flags); enet_peer_send(E->get(), event.channelID, packet2); } if (-target != 1) { //server is not excluded incoming_packets.push_back(packet); } else { //server is excluded, erase packet enet_packet_destroy(packet.packet); } } else if (target == 1) { //to myself and only myself incoming_packets.push_back(packet); } else { //to someone else, specifically ERR_CONTINUE(!peer_map.has(target)); enet_peer_send(peer_map[target], event.channelID, packet.packet); } } else { incoming_packets.push_back(packet); } //destroy packet later.. } else { ERR_CONTINUE(true); } } break; case ENET_EVENT_TYPE_NONE: { //do nothing } break; } } } bool NetworkedMultiplayerENet::is_server() const { ERR_FAIL_COND_V(!active, false); return server; } void NetworkedMultiplayerENet::close_connection() { if (!active) return; _pop_current_packet(); bool peers_disconnected = false; for (Map::Element *E = peer_map.front(); E; E = E->next()) { if (E->get()) { enet_peer_disconnect_now(E->get(), unique_id); peers_disconnected = true; } } if (peers_disconnected) { enet_host_flush(host); OS::get_singleton()->delay_usec(100); //wait 100ms for disconnection packets to send } enet_host_destroy(host); active = false; incoming_packets.clear(); unique_id = 1; //server is 1 connection_status = CONNECTION_DISCONNECTED; } int NetworkedMultiplayerENet::get_available_packet_count() const { return incoming_packets.size(); } Error NetworkedMultiplayerENet::get_packet(const uint8_t **r_buffer, int &r_buffer_size) { ERR_FAIL_COND_V(incoming_packets.size() == 0, ERR_UNAVAILABLE); _pop_current_packet(); current_packet = incoming_packets.front()->get(); incoming_packets.pop_front(); *r_buffer = (const uint8_t *)(¤t_packet.packet->data[12]); r_buffer_size = current_packet.packet->dataLength - 12; return OK; } Error NetworkedMultiplayerENet::put_packet(const uint8_t *p_buffer, int p_buffer_size) { ERR_FAIL_COND_V(!active, ERR_UNCONFIGURED); ERR_FAIL_COND_V(connection_status != CONNECTION_CONNECTED, ERR_UNCONFIGURED); int packet_flags = 0; int channel = SYSCH_RELIABLE; switch (transfer_mode) { case TRANSFER_MODE_UNRELIABLE: { packet_flags = ENET_PACKET_FLAG_UNSEQUENCED; channel = SYSCH_UNRELIABLE; } break; case TRANSFER_MODE_UNRELIABLE_ORDERED: { packet_flags = 0; channel = SYSCH_UNRELIABLE; } break; case TRANSFER_MODE_RELIABLE: { packet_flags = ENET_PACKET_FLAG_RELIABLE; channel = SYSCH_RELIABLE; } break; } Map::Element *E = NULL; if (target_peer != 0) { E = peer_map.find(ABS(target_peer)); if (!E) { ERR_EXPLAIN("Invalid Target Peer: " + itos(target_peer)); ERR_FAIL_V(ERR_INVALID_PARAMETER); } } ENetPacket *packet = enet_packet_create(NULL, p_buffer_size + 12, packet_flags); encode_uint32(unique_id, &packet->data[0]); //source ID encode_uint32(target_peer, &packet->data[4]); //dest ID encode_uint32(packet_flags, &packet->data[8]); //dest ID copymem(&packet->data[12], p_buffer, p_buffer_size); if (server) { if (target_peer == 0) { enet_host_broadcast(host, channel, packet); } else if (target_peer < 0) { //send to all but one //and make copies for sending int exclude = -target_peer; for (Map::Element *F = peer_map.front(); F; F = F->next()) { if (F->key() == exclude) // exclude packet continue; ENetPacket *packet2 = enet_packet_create(packet->data, packet->dataLength, packet_flags); enet_peer_send(F->get(), channel, packet2); } enet_packet_destroy(packet); //original packet no longer needed } else { enet_peer_send(E->get(), channel, packet); } } else { ERR_FAIL_COND_V(!peer_map.has(1), ERR_BUG); enet_peer_send(peer_map[1], channel, packet); //send to server for broadcast.. } enet_host_flush(host); return OK; } int NetworkedMultiplayerENet::get_max_packet_size() const { return 1 << 24; //anything is good } void NetworkedMultiplayerENet::_pop_current_packet() { if (current_packet.packet) { enet_packet_destroy(current_packet.packet); current_packet.packet = NULL; current_packet.from = 0; } } NetworkedMultiplayerPeer::ConnectionStatus NetworkedMultiplayerENet::get_connection_status() const { return connection_status; } uint32_t NetworkedMultiplayerENet::_gen_unique_id() const { uint32_t hash = 0; while (hash == 0 || hash == 1) { hash = hash_djb2_one_32( (uint32_t)OS::get_singleton()->get_ticks_usec()); hash = hash_djb2_one_32( (uint32_t)OS::get_singleton()->get_unix_time(), hash); hash = hash_djb2_one_32( (uint32_t)OS::get_singleton()->get_user_data_dir().hash64(), hash); /* hash = hash_djb2_one_32( (uint32_t)OS::get_singleton()->get_unique_id().hash64(), hash ); */ hash = hash_djb2_one_32( (uint32_t)((uint64_t)this), hash); //rely on aslr heap hash = hash_djb2_one_32( (uint32_t)((uint64_t)&hash), hash); //rely on aslr stack hash = hash & 0x7FFFFFFF; // make it compatible with unsigned, since negatie id is used for exclusion } return hash; } int NetworkedMultiplayerENet::get_unique_id() const { ERR_FAIL_COND_V(!active, 0); return unique_id; } void NetworkedMultiplayerENet::set_refuse_new_connections(bool p_enable) { refuse_connections = p_enable; } bool NetworkedMultiplayerENet::is_refusing_new_connections() const { return refuse_connections; } void NetworkedMultiplayerENet::set_compression_mode(CompressionMode p_mode) { compression_mode = p_mode; } NetworkedMultiplayerENet::CompressionMode NetworkedMultiplayerENet::get_compression_mode() const { return compression_mode; } size_t NetworkedMultiplayerENet::enet_compress(void *context, const ENetBuffer *inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 *outData, size_t outLimit) { NetworkedMultiplayerENet *enet = (NetworkedMultiplayerENet *)(context); if (size_t(enet->src_compressor_mem.size()) < inLimit) { enet->src_compressor_mem.resize(inLimit); } int total = inLimit; int ofs = 0; while (total) { for (size_t i = 0; i < inBufferCount; i++) { int to_copy = MIN(total, int(inBuffers[i].dataLength)); copymem(&enet->src_compressor_mem[ofs], inBuffers[i].data, to_copy); ofs += to_copy; total -= to_copy; } } Compression::Mode mode; switch (enet->compression_mode) { case COMPRESS_FASTLZ: { mode = Compression::MODE_FASTLZ; } break; case COMPRESS_ZLIB: { mode = Compression::MODE_DEFLATE; } break; case COMPRESS_ZSTD: { mode = Compression::MODE_ZSTD; } break; default: { ERR_FAIL_V(0); } } int req_size = Compression::get_max_compressed_buffer_size(ofs, mode); if (enet->dst_compressor_mem.size() < req_size) { enet->dst_compressor_mem.resize(req_size); } int ret = Compression::compress(enet->dst_compressor_mem.ptrw(), enet->src_compressor_mem.ptr(), ofs, mode); if (ret < 0) return 0; if (ret > int(outLimit)) return 0; //do not bother copymem(outData, enet->dst_compressor_mem.ptr(), ret); return ret; } size_t NetworkedMultiplayerENet::enet_decompress(void *context, const enet_uint8 *inData, size_t inLimit, enet_uint8 *outData, size_t outLimit) { NetworkedMultiplayerENet *enet = (NetworkedMultiplayerENet *)(context); int ret = -1; switch (enet->compression_mode) { case COMPRESS_FASTLZ: { ret = Compression::decompress(outData, outLimit, inData, inLimit, Compression::MODE_FASTLZ); } break; case COMPRESS_ZLIB: { ret = Compression::decompress(outData, outLimit, inData, inLimit, Compression::MODE_DEFLATE); } break; case COMPRESS_ZSTD: { ret = Compression::decompress(outData, outLimit, inData, inLimit, Compression::MODE_ZSTD); } break; default: {} } if (ret < 0) { return 0; } else { return ret; } } void NetworkedMultiplayerENet::_setup_compressor() { switch (compression_mode) { case COMPRESS_NONE: { enet_host_compress(host, NULL); } break; case COMPRESS_RANGE_CODER: { enet_host_compress_with_range_coder(host); } break; case COMPRESS_FASTLZ: case COMPRESS_ZLIB: case COMPRESS_ZSTD: { enet_host_compress(host, &enet_compressor); } break; } } void NetworkedMultiplayerENet::enet_compressor_destroy(void *context) { //do none } void NetworkedMultiplayerENet::_bind_methods() { ClassDB::bind_method(D_METHOD("create_server", "port", "max_clients", "in_bandwidth", "out_bandwidth"), &NetworkedMultiplayerENet::create_server, DEFVAL(32), DEFVAL(0), DEFVAL(0)); ClassDB::bind_method(D_METHOD("create_client", "ip", "port", "in_bandwidth", "out_bandwidth"), &NetworkedMultiplayerENet::create_client, DEFVAL(0), DEFVAL(0)); ClassDB::bind_method(D_METHOD("close_connection"), &NetworkedMultiplayerENet::close_connection); ClassDB::bind_method(D_METHOD("set_compression_mode", "mode"), &NetworkedMultiplayerENet::set_compression_mode); ClassDB::bind_method(D_METHOD("get_compression_mode"), &NetworkedMultiplayerENet::get_compression_mode); ClassDB::bind_method(D_METHOD("set_bind_ip", "ip"), &NetworkedMultiplayerENet::set_bind_ip); ADD_PROPERTY(PropertyInfo(Variant::INT, "compression_mode", PROPERTY_HINT_ENUM, "None,Range Coder,FastLZ,ZLib,ZStd"), "set_compression_mode", "get_compression_mode"); BIND_ENUM_CONSTANT(COMPRESS_NONE); BIND_ENUM_CONSTANT(COMPRESS_RANGE_CODER); BIND_ENUM_CONSTANT(COMPRESS_FASTLZ); BIND_ENUM_CONSTANT(COMPRESS_ZLIB); BIND_ENUM_CONSTANT(COMPRESS_ZSTD); } NetworkedMultiplayerENet::NetworkedMultiplayerENet() { active = false; server = false; refuse_connections = false; unique_id = 0; target_peer = 0; current_packet.packet = NULL; transfer_mode = TRANSFER_MODE_RELIABLE; connection_status = CONNECTION_DISCONNECTED; compression_mode = COMPRESS_NONE; enet_compressor.context = this; enet_compressor.compress = enet_compress; enet_compressor.decompress = enet_decompress; enet_compressor.destroy = enet_compressor_destroy; bind_ip = IP_Address("*"); } NetworkedMultiplayerENet::~NetworkedMultiplayerENet() { close_connection(); } // sets IP for ENet to bind when using create_server // if no IP is set, then ENet bind to ENET_HOST_ANY void NetworkedMultiplayerENet::set_bind_ip(const IP_Address &p_ip) { ERR_FAIL_COND(!p_ip.is_valid() && !p_ip.is_wildcard()); bind_ip = p_ip; }