93ab45b6b5
They do not play well with clang-format which aligns the `//` part with the rest of the code block, thus producing badly indented commented code.
691 lines
19 KiB
C++
691 lines
19 KiB
C++
/*************************************************************************/
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/* networked_multiplayer_enet.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "os/os.h"
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#include "io/marshalls.h"
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#include "networked_multiplayer_enet.h"
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void NetworkedMultiplayerENet::set_transfer_mode(TransferMode p_mode) {
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transfer_mode=p_mode;
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}
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void NetworkedMultiplayerENet::set_target_peer(int p_peer){
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target_peer=p_peer;
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}
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int NetworkedMultiplayerENet::get_packet_peer() const{
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ERR_FAIL_COND_V(!active,1);
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ERR_FAIL_COND_V(incoming_packets.size()==0,1);
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return incoming_packets.front()->get().from;
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}
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Error NetworkedMultiplayerENet::create_server(int p_port, int p_max_clients, int p_in_bandwidth, int p_out_bandwidth){
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ERR_FAIL_COND_V(active,ERR_ALREADY_IN_USE);
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ENetAddress address;
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address.host = bind_ip;
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address.port = p_port;
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host = enet_host_create (& address /* the address to bind the server host to */,
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p_max_clients /* allow up to 32 clients and/or outgoing connections */,
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SYSCH_MAX /* allow up to SYSCH_MAX channels to be used */,
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p_in_bandwidth /* assume any amount of incoming bandwidth */,
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p_out_bandwidth /* assume any amount of outgoing bandwidth */);
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ERR_FAIL_COND_V(!host,ERR_CANT_CREATE);
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_setup_compressor();
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active=true;
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server=true;
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refuse_connections=false;
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unique_id=1;
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connection_status=CONNECTION_CONNECTED;
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return OK;
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}
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Error NetworkedMultiplayerENet::create_client(const IP_Address& p_ip, int p_port, int p_in_bandwidth, int p_out_bandwidth){
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ERR_FAIL_COND_V(active,ERR_ALREADY_IN_USE);
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ERR_FAIL_COND_V(!p_ip.is_ipv4(), ERR_INVALID_PARAMETER);
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host = enet_host_create (NULL /* create a client host */,
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1 /* only allow 1 outgoing connection */,
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SYSCH_MAX /* allow up to SYSCH_MAX channels to be used */,
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p_in_bandwidth /* 56K modem with 56 Kbps downstream bandwidth */,
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p_out_bandwidth /* 56K modem with 14 Kbps upstream bandwidth */);
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ERR_FAIL_COND_V(!host,ERR_CANT_CREATE);
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_setup_compressor();
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ENetAddress address;
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address.host=*((uint32_t *)p_ip.get_ipv4());
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address.port=p_port;
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//enet_address_set_host (& address, "localhost");
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//address.port = p_port;
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unique_id=_gen_unique_id();
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/* Initiate the connection, allocating the enough channels */
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ENetPeer *peer = enet_host_connect (host, & address, SYSCH_MAX, unique_id);
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if (peer == NULL) {
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enet_host_destroy(host);
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ERR_FAIL_COND_V(!peer,ERR_CANT_CREATE);
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}
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//technically safe to ignore the peer or anything else.
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connection_status=CONNECTION_CONNECTING;
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active=true;
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server=false;
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refuse_connections=false;
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return OK;
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}
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void NetworkedMultiplayerENet::poll(){
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ERR_FAIL_COND(!active);
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_pop_current_packet();
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ENetEvent event;
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/* Wait up to 1000 milliseconds for an event. */
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while (true) {
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if (!host || !active) //might have been disconnected while emitting a notification
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return;
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int ret = enet_host_service (host, & event, 1);
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if (ret<0) {
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//error, do something?
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break;
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} else if (ret==0) {
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break;
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}
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switch (event.type)
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{
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case ENET_EVENT_TYPE_CONNECT: {
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/* Store any relevant client information here. */
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if (server && refuse_connections) {
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enet_peer_reset(event.peer);
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break;
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}
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IP_Address ip;
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ip.set_ipv4((uint8_t *)&(event.peer -> address.host));
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int *new_id = memnew( int );
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*new_id = event.data;
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if (*new_id==0) { //data zero is sent by server (enet won't let you configure this). Server is always 1
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*new_id=1;
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}
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event.peer->data=new_id;
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peer_map[*new_id]=event.peer;
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connection_status=CONNECTION_CONNECTED; //if connecting, this means it connected t something!
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emit_signal("peer_connected",*new_id);
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if (server) {
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//someone connected, let it know of all the peers available
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for (Map<int,ENetPeer*>::Element *E=peer_map.front();E;E=E->next()) {
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if (E->key()==*new_id)
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continue;
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//send existing peers to new peer
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ENetPacket * packet = enet_packet_create (NULL,8,ENET_PACKET_FLAG_RELIABLE);
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encode_uint32(SYSMSG_ADD_PEER,&packet->data[0]);
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encode_uint32(E->key(),&packet->data[4]);
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enet_peer_send(event.peer,SYSCH_CONFIG,packet);
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//send the new peer to existing peers
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packet = enet_packet_create (NULL,8,ENET_PACKET_FLAG_RELIABLE);
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encode_uint32(SYSMSG_ADD_PEER,&packet->data[0]);
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encode_uint32(*new_id,&packet->data[4]);
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enet_peer_send(E->get(),SYSCH_CONFIG,packet);
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}
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} else {
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emit_signal("connection_succeeded");
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}
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} break;
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case ENET_EVENT_TYPE_DISCONNECT: {
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/* Reset the peer's client information. */
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int *id = (int*)event.peer -> data;
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if (!id) {
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if (!server) {
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emit_signal("connection_failed");
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}
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} else {
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if (server) {
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//someone disconnected, let it know to everyone else
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for (Map<int,ENetPeer*>::Element *E=peer_map.front();E;E=E->next()) {
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if (E->key()==*id)
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continue;
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//send the new peer to existing peers
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ENetPacket* packet = enet_packet_create (NULL,8,ENET_PACKET_FLAG_RELIABLE);
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encode_uint32(SYSMSG_REMOVE_PEER,&packet->data[0]);
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encode_uint32(*id,&packet->data[4]);
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enet_peer_send(E->get(),SYSCH_CONFIG,packet);
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}
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} else if (!server) {
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emit_signal("server_disconnected");
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close_connection();
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return;
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}
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emit_signal("peer_disconnected",*id);
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peer_map.erase(*id);
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memdelete( id );
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}
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} break;
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case ENET_EVENT_TYPE_RECEIVE: {
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if (event.channelID==SYSCH_CONFIG) {
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//some config message
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ERR_CONTINUE( event.packet->dataLength < 8);
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// Only server can send config messages
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ERR_CONTINUE( server );
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int msg = decode_uint32(&event.packet->data[0]);
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int id = decode_uint32(&event.packet->data[4]);
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switch(msg) {
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case SYSMSG_ADD_PEER: {
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peer_map[id]=NULL;
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emit_signal("peer_connected",id);
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} break;
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case SYSMSG_REMOVE_PEER: {
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peer_map.erase(id);
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emit_signal("peer_disconnected",id);
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} break;
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}
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enet_packet_destroy(event.packet);
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} else if (event.channelID < SYSCH_MAX){
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Packet packet;
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packet.packet = event.packet;
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uint32_t *id = (uint32_t*)event.peer->data;
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ERR_CONTINUE(event.packet->dataLength<12)
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uint32_t source = decode_uint32(&event.packet->data[0]);
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int target = decode_uint32(&event.packet->data[4]);
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uint32_t flags = decode_uint32(&event.packet->data[8]);
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packet.from=source;
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if (server) {
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// Someone is cheating and trying to fake the source!
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ERR_CONTINUE(source!=*id);
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packet.from=*id;
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if (target==0) {
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//re-send the everyone but sender :|
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incoming_packets.push_back(packet);
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//and make copies for sending
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for (Map<int,ENetPeer*>::Element *E=peer_map.front();E;E=E->next()) {
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if (uint32_t(E->key())==source) //do not resend to self
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continue;
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ENetPacket* packet2 = enet_packet_create (packet.packet->data,packet.packet->dataLength,flags);
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enet_peer_send(E->get(),event.channelID,packet2);
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}
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} else if (target<0) {
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//to all but one
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//and make copies for sending
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for (Map<int,ENetPeer*>::Element *E=peer_map.front();E;E=E->next()) {
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if (uint32_t(E->key())==source || E->key()==-target) //do not resend to self, also do not send to excluded
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continue;
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ENetPacket* packet2 = enet_packet_create (packet.packet->data,packet.packet->dataLength,flags);
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enet_peer_send(E->get(),event.channelID,packet2);
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}
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if (-target != 1) {
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//server is not excluded
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incoming_packets.push_back(packet);
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} else {
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//server is excluded, erase packet
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enet_packet_destroy(packet.packet);
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}
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} else if (target==1) {
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//to myself and only myself
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incoming_packets.push_back(packet);
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} else {
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//to someone else, specifically
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ERR_CONTINUE(!peer_map.has(target));
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enet_peer_send(peer_map[target],event.channelID,packet.packet);
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}
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} else {
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incoming_packets.push_back(packet);
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}
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//destroy packet later..
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} else {
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ERR_CONTINUE(true);
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}
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}break;
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case ENET_EVENT_TYPE_NONE: {
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//do nothing
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} break;
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}
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}
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}
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bool NetworkedMultiplayerENet::is_server() const {
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ERR_FAIL_COND_V(!active,false);
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return server;
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}
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void NetworkedMultiplayerENet::close_connection() {
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if (!active)
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return;
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_pop_current_packet();
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bool peers_disconnected=false;
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for (Map<int,ENetPeer*>::Element *E=peer_map.front();E;E=E->next()) {
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if (E->get()) {
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enet_peer_disconnect_now(E->get(),unique_id);
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peers_disconnected=true;
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}
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}
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if (peers_disconnected) {
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enet_host_flush(host);
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OS::get_singleton()->delay_usec(100); //wait 100ms for disconnection packets to send
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}
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enet_host_destroy(host);
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active=false;
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incoming_packets.clear();
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unique_id=1; //server is 1
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connection_status=CONNECTION_DISCONNECTED;
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}
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int NetworkedMultiplayerENet::get_available_packet_count() const {
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return incoming_packets.size();
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}
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Error NetworkedMultiplayerENet::get_packet(const uint8_t **r_buffer,int &r_buffer_size) const{
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ERR_FAIL_COND_V(incoming_packets.size()==0,ERR_UNAVAILABLE);
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_pop_current_packet();
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current_packet = incoming_packets.front()->get();
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incoming_packets.pop_front();
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*r_buffer=(const uint8_t*)(¤t_packet.packet->data[12]);
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r_buffer_size=current_packet.packet->dataLength-12;
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return OK;
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}
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Error NetworkedMultiplayerENet::put_packet(const uint8_t *p_buffer,int p_buffer_size){
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ERR_FAIL_COND_V(!active,ERR_UNCONFIGURED);
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ERR_FAIL_COND_V(connection_status!=CONNECTION_CONNECTED,ERR_UNCONFIGURED);
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int packet_flags=0;
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int channel=SYSCH_RELIABLE;
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switch(transfer_mode) {
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case TRANSFER_MODE_UNRELIABLE: {
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packet_flags=ENET_PACKET_FLAG_UNSEQUENCED;
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channel=SYSCH_UNRELIABLE;
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} break;
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case TRANSFER_MODE_UNRELIABLE_ORDERED: {
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packet_flags=0;
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channel=SYSCH_UNRELIABLE;
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} break;
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case TRANSFER_MODE_RELIABLE: {
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packet_flags=ENET_PACKET_FLAG_RELIABLE;
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channel=SYSCH_RELIABLE;
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} break;
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}
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Map<int,ENetPeer*>::Element *E=NULL;
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if (target_peer!=0) {
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E = peer_map.find(ABS(target_peer));
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if (!E) {
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ERR_EXPLAIN("Invalid Target Peer: "+itos(target_peer));
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ERR_FAIL_V(ERR_INVALID_PARAMETER);
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}
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}
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ENetPacket * packet = enet_packet_create (NULL,p_buffer_size+12,packet_flags);
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encode_uint32(unique_id,&packet->data[0]); //source ID
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encode_uint32(target_peer,&packet->data[4]); //dest ID
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encode_uint32(packet_flags,&packet->data[8]); //dest ID
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copymem(&packet->data[12],p_buffer,p_buffer_size);
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if (server) {
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if (target_peer==0) {
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enet_host_broadcast(host,channel,packet);
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} else if (target_peer<0) {
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//send to all but one
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//and make copies for sending
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int exclude=-target_peer;
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for (Map<int,ENetPeer*>::Element *F=peer_map.front();F;F=F->next()) {
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if (F->key()==exclude) // exclude packet
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continue;
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ENetPacket* packet2 = enet_packet_create (packet->data,packet->dataLength,packet_flags);
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enet_peer_send(F->get(),channel,packet2);
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}
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enet_packet_destroy(packet); //original packet no longer needed
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} else {
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enet_peer_send (E->get(), channel, packet);
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}
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} else {
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ERR_FAIL_COND_V(!peer_map.has(1),ERR_BUG);
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enet_peer_send (peer_map[1], channel, packet); //send to server for broadcast..
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}
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enet_host_flush(host);
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return OK;
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}
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int NetworkedMultiplayerENet::get_max_packet_size() const {
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return 1<<24; //anything is good
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}
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void NetworkedMultiplayerENet::_pop_current_packet() const {
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if (current_packet.packet) {
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enet_packet_destroy(current_packet.packet);
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current_packet.packet=NULL;
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current_packet.from=0;
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}
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}
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NetworkedMultiplayerPeer::ConnectionStatus NetworkedMultiplayerENet::get_connection_status() const {
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return connection_status;
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}
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uint32_t NetworkedMultiplayerENet::_gen_unique_id() const {
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uint32_t hash = 0;
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while (hash==0 || hash==1) {
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_ticks_usec() );
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_unix_time(), hash );
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_data_dir().hash64(), hash );
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/*
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_unique_ID().hash64(), hash );
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*/
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hash = hash_djb2_one_32(
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(uint32_t)((uint64_t)this), hash ); //rely on aslr heap
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hash = hash_djb2_one_32(
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(uint32_t)((uint64_t)&hash), hash ); //rely on aslr stack
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hash=hash&0x7FFFFFFF; // make it compatible with unsigned, since negatie id is used for exclusion
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}
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return hash;
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}
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int NetworkedMultiplayerENet::get_unique_id() const {
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ERR_FAIL_COND_V(!active,0);
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return unique_id;
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}
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void NetworkedMultiplayerENet::set_refuse_new_connections(bool p_enable) {
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refuse_connections=p_enable;
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}
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bool NetworkedMultiplayerENet::is_refusing_new_connections() const {
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return refuse_connections;
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}
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void NetworkedMultiplayerENet::set_compression_mode(CompressionMode p_mode) {
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compression_mode=p_mode;
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}
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NetworkedMultiplayerENet::CompressionMode NetworkedMultiplayerENet::get_compression_mode() const{
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return compression_mode;
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}
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size_t NetworkedMultiplayerENet::enet_compress(void * context, const ENetBuffer * inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 * outData, size_t outLimit) {
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NetworkedMultiplayerENet *enet = (NetworkedMultiplayerENet*)(context);
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if (size_t(enet->src_compressor_mem.size())<inLimit) {
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enet->src_compressor_mem.resize( inLimit );
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}
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int total = inLimit;
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int ofs=0;
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while(total) {
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for(size_t i=0;i<inBufferCount;i++) {
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int to_copy = MIN(total,int(inBuffers[i].dataLength));
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copymem(&enet->src_compressor_mem[ofs],inBuffers[i].data,to_copy);
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ofs+=to_copy;
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total-=to_copy;
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}
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}
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Compression::Mode mode;
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switch(enet->compression_mode) {
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case COMPRESS_FASTLZ: {
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mode=Compression::MODE_FASTLZ;
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} break;
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case COMPRESS_ZLIB: {
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mode=Compression::MODE_DEFLATE;
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|
} break;
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default: { ERR_FAIL_V(0); }
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|
}
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|
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int req_size = Compression::get_max_compressed_buffer_size(ofs,mode);
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|
if (enet->dst_compressor_mem.size()<req_size) {
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|
enet->dst_compressor_mem.resize(req_size);
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|
}
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|
int ret=Compression::compress(enet->dst_compressor_mem.ptr(),enet->src_compressor_mem.ptr(),ofs,mode);
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|
|
|
if (ret<0)
|
|
return 0;
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|
|
|
|
|
if (ret>int(outLimit))
|
|
return 0; //do not bother
|
|
|
|
copymem(outData,enet->dst_compressor_mem.ptr(),ret);
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|
|
|
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;
|
|
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: {
|
|
|
|
enet_host_compress(host,&enet_compressor);
|
|
} break;
|
|
}
|
|
}
|
|
|
|
void NetworkedMultiplayerENet::enet_compressor_destroy(void * context){
|
|
|
|
//do none
|
|
}
|
|
|
|
|
|
void NetworkedMultiplayerENet::_bind_methods() {
|
|
|
|
ClassDB::bind_method(_MD("create_server","port","max_clients","in_bandwidth","out_bandwidth"),&NetworkedMultiplayerENet::create_server,DEFVAL(32),DEFVAL(0),DEFVAL(0));
|
|
ClassDB::bind_method(_MD("create_client","ip","port","in_bandwidth","out_bandwidth"),&NetworkedMultiplayerENet::create_client,DEFVAL(0),DEFVAL(0));
|
|
ClassDB::bind_method(_MD("close_connection"),&NetworkedMultiplayerENet::close_connection);
|
|
ClassDB::bind_method(_MD("set_compression_mode","mode"),&NetworkedMultiplayerENet::set_compression_mode);
|
|
ClassDB::bind_method(_MD("get_compression_mode"),&NetworkedMultiplayerENet::get_compression_mode);
|
|
ClassDB::bind_method(_MD("set_bind_ip", "ip"),&NetworkedMultiplayerENet::set_bind_ip);
|
|
|
|
BIND_CONSTANT( COMPRESS_NONE );
|
|
BIND_CONSTANT( COMPRESS_RANGE_CODER );
|
|
BIND_CONSTANT( COMPRESS_FASTLZ );
|
|
BIND_CONSTANT( COMPRESS_ZLIB );
|
|
}
|
|
|
|
|
|
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=ENET_HOST_ANY;
|
|
}
|
|
|
|
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_ipv4());
|
|
bind_ip=*(uint32_t *)p_ip.get_ipv4();
|
|
}
|