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godot/modules/enet/enet_multiplayer_peer.cpp

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/*************************************************************************/
/* enet_multiplayer_peer.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 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 "enet_multiplayer_peer.h"
#include "core/io/ip.h"
#include "core/io/marshalls.h"
#include "core/os/os.h"
void ENetMultiplayerPeer::set_target_peer(int p_peer) {
target_peer = p_peer;
}
int ENetMultiplayerPeer::get_packet_peer() const {
ERR_FAIL_COND_V_MSG(!_is_active(), 1, "The multiplayer instance isn't currently active.");
ERR_FAIL_COND_V(incoming_packets.size() == 0, 1);
return incoming_packets.front()->get().from;
}
MultiplayerPeer::TransferMode ENetMultiplayerPeer::get_packet_mode() const {
ERR_FAIL_COND_V_MSG(!_is_active(), TRANSFER_MODE_RELIABLE, "The multiplayer instance isn't currently active.");
ERR_FAIL_COND_V(incoming_packets.size() == 0, TRANSFER_MODE_RELIABLE);
return incoming_packets.front()->get().transfer_mode;
}
int ENetMultiplayerPeer::get_packet_channel() const {
ERR_FAIL_COND_V_MSG(!_is_active(), 1, "The multiplayer instance isn't currently active.");
ERR_FAIL_COND_V(incoming_packets.size() == 0, 1);
int ch = incoming_packets.front()->get().channel;
if (ch >= SYSCH_MAX) { // First 2 channels are reserved.
return ch - SYSCH_MAX + 1;
}
return 0;
}
Error ENetMultiplayerPeer::create_server(int p_port, int p_max_clients, int p_max_channels, int p_in_bandwidth, int p_out_bandwidth) {
ERR_FAIL_COND_V_MSG(_is_active(), ERR_ALREADY_IN_USE, "The multiplayer instance is already active.");
set_refuse_new_connections(false);
Ref<ENetConnection> host;
host.instantiate();
Error err = host->create_host_bound(bind_ip, p_port, p_max_clients, 0, p_max_channels > 0 ? p_max_channels + SYSCH_MAX : 0, p_out_bandwidth);
if (err != OK) {
return err;
}
active_mode = MODE_SERVER;
unique_id = 1;
connection_status = CONNECTION_CONNECTED;
hosts[0] = host;
return OK;
}
Error ENetMultiplayerPeer::create_client(const String &p_address, int p_port, int p_channel_count, int p_in_bandwidth, int p_out_bandwidth, int p_local_port) {
ERR_FAIL_COND_V_MSG(_is_active(), ERR_ALREADY_IN_USE, "The multiplayer instance is already active.");
set_refuse_new_connections(false);
Ref<ENetConnection> host;
host.instantiate();
Error err;
if (p_local_port) {
err = host->create_host_bound(bind_ip, p_local_port, 1, 0, p_in_bandwidth, p_out_bandwidth);
} else {
err = host->create_host(1, 0, p_in_bandwidth, p_out_bandwidth);
}
if (err != OK) {
return err;
}
unique_id = generate_unique_id();
Ref<ENetPacketPeer> peer = host->connect_to_host(p_address, p_port, p_channel_count > 0 ? p_channel_count + SYSCH_MAX : 0, unique_id);
if (peer.is_null()) {
host->destroy();
ERR_FAIL_V_MSG(ERR_CANT_CREATE, "Couldn't connect to the ENet multiplayer server.");
}
// Need to wait for CONNECT event.
connection_status = CONNECTION_CONNECTING;
active_mode = MODE_CLIENT;
peers[1] = peer;
hosts[0] = host;
return OK;
}
Error ENetMultiplayerPeer::create_mesh(int p_id) {
ERR_FAIL_COND_V_MSG(p_id <= 0, ERR_INVALID_PARAMETER, "The unique ID must be greater then 0");
ERR_FAIL_COND_V_MSG(_is_active(), ERR_ALREADY_IN_USE, "The multiplayer instance is already active.");
active_mode = MODE_MESH;
unique_id = p_id;
connection_status = CONNECTION_CONNECTED;
return OK;
}
Error ENetMultiplayerPeer::add_mesh_peer(int p_id, Ref<ENetConnection> p_host) {
ERR_FAIL_COND_V(p_host.is_null(), ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V_MSG(active_mode != MODE_MESH, ERR_UNCONFIGURED, "The multiplayer instance is not configured as a mesh. Call 'create_mesh' first.");
List<Ref<ENetPacketPeer>> host_peers;
p_host->get_peers(host_peers);
ERR_FAIL_COND_V_MSG(host_peers.size() != 1 || host_peers[0]->get_state() != ENetPacketPeer::STATE_CONNECTED, ERR_INVALID_PARAMETER, "The provided host must have exactly one peer in the connected state.");
hosts[p_id] = p_host;
peers[p_id] = host_peers[0];
emit_signal(SNAME("peer_connected"), p_id);
return OK;
}
void ENetMultiplayerPeer::_store_packet(int32_t p_source, ENetConnection::Event &p_event) {
Packet packet;
packet.packet = p_event.packet;
packet.channel = p_event.channel_id;
packet.from = p_source;
if (p_event.packet->flags & ENET_PACKET_FLAG_RELIABLE) {
packet.transfer_mode = TRANSFER_MODE_RELIABLE;
} else if (p_event.packet->flags & ENET_PACKET_FLAG_UNSEQUENCED) {
packet.transfer_mode = TRANSFER_MODE_UNRELIABLE;
} else {
packet.transfer_mode = TRANSFER_MODE_UNRELIABLE_ORDERED;
}
packet.packet->referenceCount++;
incoming_packets.push_back(packet);
}
bool ENetMultiplayerPeer::_parse_server_event(ENetConnection::EventType p_type, ENetConnection::Event &p_event) {
switch (p_type) {
case ENetConnection::EVENT_CONNECT: {
if (is_refusing_new_connections()) {
p_event.peer->reset();
return false;
}
// Client joined with invalid ID, probably trying to exploit us.
if (p_event.data < 2 || peers.has((int)p_event.data)) {
p_event.peer->reset();
return false;
}
int id = p_event.data;
p_event.peer->set_meta(SNAME("_net_id"), id);
peers[id] = p_event.peer;
emit_signal(SNAME("peer_connected"), id);
return false;
}
case ENetConnection::EVENT_DISCONNECT: {
int id = p_event.peer->get_meta(SNAME("_net_id"));
if (!peers.has(id)) {
// Never fully connected.
return false;
}
emit_signal(SNAME("peer_disconnected"), id);
peers.erase(id);
return false;
}
case ENetConnection::EVENT_RECEIVE: {
int32_t source = p_event.peer->get_meta(SNAME("_net_id"));
_store_packet(source, p_event);
return false;
}
default:
return true;
}
}
bool ENetMultiplayerPeer::_parse_client_event(ENetConnection::EventType p_type, ENetConnection::Event &p_event) {
switch (p_type) {
case ENetConnection::EVENT_CONNECT: {
connection_status = CONNECTION_CONNECTED;
emit_signal(SNAME("peer_connected"), 1);
emit_signal(SNAME("connection_succeeded"));
return false;
}
case ENetConnection::EVENT_DISCONNECT: {
if (connection_status == CONNECTION_CONNECTED) {
// Client just disconnected from server.
emit_signal(SNAME("server_disconnected"));
} else {
emit_signal(SNAME("connection_failed"));
}
close_connection();
return true;
}
case ENetConnection::EVENT_RECEIVE: {
_store_packet(1, p_event);
return false;
}
default:
return true;
}
}
bool ENetMultiplayerPeer::_parse_mesh_event(ENetConnection::EventType p_type, ENetConnection::Event &p_event, int p_peer_id) {
switch (p_type) {
case ENetConnection::EVENT_CONNECT:
p_event.peer->reset();
return false;
case ENetConnection::EVENT_DISCONNECT:
if (peers.has(p_peer_id)) {
emit_signal(SNAME("peer_disconnected"), p_peer_id);
peers.erase(p_peer_id);
}
hosts.erase(p_peer_id);
return true;
case ENetConnection::EVENT_RECEIVE: {
_store_packet(p_peer_id, p_event);
return false;
} break;
default:
// Nothing to do
return true;
}
}
void ENetMultiplayerPeer::poll() {
ERR_FAIL_COND_MSG(!_is_active(), "The multiplayer instance isn't currently active.");
_pop_current_packet();
switch (active_mode) {
case MODE_CLIENT: {
if (peers.has(1) && !peers[1]->is_active()) {
if (connection_status == CONNECTION_CONNECTED) {
// Client just disconnected from server.
emit_signal(SNAME("server_disconnected"));
} else {
emit_signal(SNAME("connection_failed"));
}
close_connection();
return;
}
ENetConnection::Event event;
ENetConnection::EventType ret = hosts[0]->service(0, event);
if (ret == ENetConnection::EVENT_ERROR) {
return;
}
do {
if (_parse_client_event(ret, event)) {
return;
}
} while (hosts[0]->check_events(ret, event) > 0);
} break;
case MODE_SERVER: {
for (const KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
if (!(E.value->is_active())) {
emit_signal(SNAME("peer_disconnected"), E.value->get_meta(SNAME("_net_id")));
peers.erase(E.key);
}
}
ENetConnection::Event event;
ENetConnection::EventType ret = hosts[0]->service(0, event);
if (ret == ENetConnection::EVENT_ERROR) {
return;
}
do {
if (_parse_server_event(ret, event)) {
return;
}
} while (hosts[0]->check_events(ret, event) > 0);
} break;
case MODE_MESH: {
for (const KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
if (!(E.value->is_active())) {
emit_signal(SNAME("peer_disconnected"), E.key);
peers.erase(E.key);
if (hosts.has(E.key)) {
hosts.erase(E.key);
}
}
}
for (KeyValue<int, Ref<ENetConnection>> &E : hosts) {
ENetConnection::Event event;
ENetConnection::EventType ret = E.value->service(0, event);
if (ret == ENetConnection::EVENT_ERROR) {
if (peers.has(E.key)) {
emit_signal(SNAME("peer_disconnected"), E.key);
peers.erase(E.key);
}
hosts.erase(E.key);
continue;
}
do {
if (_parse_mesh_event(ret, event, E.key)) {
break; // Keep polling the others.
}
} while (E.value->check_events(ret, event) > 0);
}
} break;
default:
return;
}
}
bool ENetMultiplayerPeer::is_server() const {
return active_mode == MODE_SERVER;
}
bool ENetMultiplayerPeer::is_server_relay_supported() const {
return active_mode == MODE_SERVER || active_mode == MODE_CLIENT;
}
void ENetMultiplayerPeer::close_connection(uint32_t wait_usec) {
if (!_is_active()) {
return;
}
_pop_current_packet();
bool peers_disconnected = false;
for (KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
if (E.value.is_valid() && E.value->get_state() == ENetPacketPeer::STATE_CONNECTED) {
E.value->peer_disconnect_now(unique_id);
peers_disconnected = true;
}
}
if (peers_disconnected) {
for (KeyValue<int, Ref<ENetConnection>> &E : hosts) {
E.value->flush();
}
if (wait_usec > 0) {
OS::get_singleton()->delay_usec(wait_usec); // Wait for disconnection packets to send
}
}
active_mode = MODE_NONE;
incoming_packets.clear();
peers.clear();
hosts.clear();
unique_id = 0;
connection_status = CONNECTION_DISCONNECTED;
set_refuse_new_connections(false);
}
int ENetMultiplayerPeer::get_available_packet_count() const {
return incoming_packets.size();
}
Error ENetMultiplayerPeer::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
ERR_FAIL_COND_V_MSG(incoming_packets.size() == 0, ERR_UNAVAILABLE, "No incoming packets available.");
_pop_current_packet();
current_packet = incoming_packets.front()->get();
incoming_packets.pop_front();
*r_buffer = (const uint8_t *)(current_packet.packet->data);
r_buffer_size = current_packet.packet->dataLength;
return OK;
}
Error ENetMultiplayerPeer::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V_MSG(!_is_active(), ERR_UNCONFIGURED, "The multiplayer instance isn't currently active.");
ERR_FAIL_COND_V_MSG(connection_status != CONNECTION_CONNECTED, ERR_UNCONFIGURED, "The multiplayer instance isn't currently connected to any server or client.");
ERR_FAIL_COND_V_MSG(target_peer != 0 && !peers.has(ABS(target_peer)), ERR_INVALID_PARAMETER, vformat("Invalid target peer: %d", target_peer));
ERR_FAIL_COND_V(active_mode == MODE_CLIENT && !peers.has(1), ERR_BUG);
int packet_flags = 0;
int channel = SYSCH_RELIABLE;
int tr_channel = get_transfer_channel();
if (tr_channel > 0) {
channel = SYSCH_MAX + tr_channel - 1;
} else {
switch (get_transfer_mode()) {
case TRANSFER_MODE_UNRELIABLE: {
packet_flags = ENET_PACKET_FLAG_UNSEQUENCED | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT;
channel = SYSCH_UNRELIABLE;
} break;
case TRANSFER_MODE_UNRELIABLE_ORDERED: {
packet_flags = ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT;
channel = SYSCH_UNRELIABLE;
} break;
case TRANSFER_MODE_RELIABLE: {
packet_flags = ENET_PACKET_FLAG_RELIABLE;
channel = SYSCH_RELIABLE;
} break;
}
}
#ifdef DEBUG_ENABLED
if ((packet_flags & ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT) && p_buffer_size > ENET_HOST_DEFAULT_MTU) {
WARN_PRINT_ONCE(vformat("Sending %d bytes unrealiably which is above the MTU (%d), this will result in higher packet loss", p_buffer_size, ENET_HOST_DEFAULT_MTU));
}
#endif
ENetPacket *packet = enet_packet_create(nullptr, p_buffer_size, packet_flags);
memcpy(&packet->data[0], p_buffer, p_buffer_size);
if (is_server()) {
if (target_peer == 0) {
hosts[0]->broadcast(channel, packet);
} else if (target_peer < 0) {
// Send to all but one and make copies for sending.
int exclude = -target_peer;
for (KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
if (E.key == exclude) {
continue;
}
E.value->send(channel, packet);
}
_destroy_unused(packet);
} else {
peers[target_peer]->send(channel, packet);
}
ERR_FAIL_COND_V(!hosts.has(0), ERR_BUG);
hosts[0]->flush();
} else if (active_mode == MODE_CLIENT) {
peers[1]->send(channel, packet); // Send to server for broadcast.
ERR_FAIL_COND_V(!hosts.has(0), ERR_BUG);
hosts[0]->flush();
} else {
if (target_peer <= 0) {
int exclude = ABS(target_peer);
for (KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
if (E.key == exclude) {
continue;
}
E.value->send(channel, packet);
ERR_CONTINUE(!hosts.has(E.key));
hosts[E.key]->flush();
}
_destroy_unused(packet);
} else {
peers[target_peer]->send(channel, packet);
ERR_FAIL_COND_V(!hosts.has(target_peer), ERR_BUG);
hosts[target_peer]->flush();
}
}
return OK;
}
int ENetMultiplayerPeer::get_max_packet_size() const {
return 1 << 24; // Anything is good
}
void ENetMultiplayerPeer::_pop_current_packet() {
if (current_packet.packet) {
current_packet.packet->referenceCount--;
_destroy_unused(current_packet.packet);
current_packet.packet = nullptr;
current_packet.from = 0;
current_packet.channel = -1;
}
}
MultiplayerPeer::ConnectionStatus ENetMultiplayerPeer::get_connection_status() const {
return connection_status;
}
int ENetMultiplayerPeer::get_unique_id() const {
ERR_FAIL_COND_V_MSG(!_is_active(), 0, "The multiplayer instance isn't currently active.");
return unique_id;
}
void ENetMultiplayerPeer::set_refuse_new_connections(bool p_enabled) {
#ifdef GODOT_ENET
if (_is_active()) {
for (KeyValue<int, Ref<ENetConnection>> &E : hosts) {
E.value->refuse_new_connections(p_enabled);
}
}
#endif
MultiplayerPeer::set_refuse_new_connections(p_enabled);
}
Ref<ENetConnection> ENetMultiplayerPeer::get_host() const {
ERR_FAIL_COND_V(!_is_active(), nullptr);
ERR_FAIL_COND_V(active_mode == MODE_MESH, nullptr);
return hosts[0];
}
Ref<ENetPacketPeer> ENetMultiplayerPeer::get_peer(int p_id) const {
ERR_FAIL_COND_V(!_is_active(), nullptr);
ERR_FAIL_COND_V(!peers.has(p_id), nullptr);
ERR_FAIL_COND_V(active_mode == MODE_CLIENT && p_id != 1, nullptr);
return peers[p_id];
}
void ENetMultiplayerPeer::_destroy_unused(ENetPacket *p_packet) {
if (p_packet->referenceCount == 0) {
enet_packet_destroy(p_packet);
}
}
void ENetMultiplayerPeer::_bind_methods() {
ClassDB::bind_method(D_METHOD("create_server", "port", "max_clients", "max_channels", "in_bandwidth", "out_bandwidth"), &ENetMultiplayerPeer::create_server, DEFVAL(32), DEFVAL(0), DEFVAL(0), DEFVAL(0));
ClassDB::bind_method(D_METHOD("create_client", "address", "port", "channel_count", "in_bandwidth", "out_bandwidth", "local_port"), &ENetMultiplayerPeer::create_client, DEFVAL(0), DEFVAL(0), DEFVAL(0), DEFVAL(0));
ClassDB::bind_method(D_METHOD("create_mesh", "unique_id"), &ENetMultiplayerPeer::create_mesh);
ClassDB::bind_method(D_METHOD("add_mesh_peer", "peer_id", "host"), &ENetMultiplayerPeer::add_mesh_peer);
ClassDB::bind_method(D_METHOD("close_connection", "wait_usec"), &ENetMultiplayerPeer::close_connection, DEFVAL(100));
ClassDB::bind_method(D_METHOD("set_bind_ip", "ip"), &ENetMultiplayerPeer::set_bind_ip);
ClassDB::bind_method(D_METHOD("get_host"), &ENetMultiplayerPeer::get_host);
ClassDB::bind_method(D_METHOD("get_peer", "id"), &ENetMultiplayerPeer::get_peer);
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "host", PROPERTY_HINT_RESOURCE_TYPE, "ENetConnection", PROPERTY_USAGE_NONE), "", "get_host");
}
ENetMultiplayerPeer::ENetMultiplayerPeer() {
bind_ip = IPAddress("*");
}
ENetMultiplayerPeer::~ENetMultiplayerPeer() {
if (_is_active()) {
close_connection();
}
}
// Sets IP for ENet to bind when using create_server or create_client
// if no IP is set, then ENet bind to ENET_HOST_ANY
void ENetMultiplayerPeer::set_bind_ip(const IPAddress &p_ip) {
ERR_FAIL_COND_MSG(!p_ip.is_valid() && !p_ip.is_wildcard(), vformat("Invalid bind IP address: %s", String(p_ip)));
bind_ip = p_ip;
}
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