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godot/modules/enet/enet_connection.cpp

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/*************************************************************************/
/* enet_connection.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 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_connection.h"
#include "enet_packet_peer.h"
#include "core/io/compression.h"
#include "core/io/ip.h"
void ENetConnection::broadcast(enet_uint8 p_channel, ENetPacket *p_packet) {
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
ERR_FAIL_COND_MSG(p_channel >= host->channelLimit, vformat("Unable to send packet on channel %d, max channels: %d", p_channel, (int)host->channelLimit));
enet_host_broadcast(host, p_channel, p_packet);
}
Error ENetConnection::create_host_bound(const IPAddress &p_bind_address, int p_port, int p_max_peers, int p_max_channels, int p_in_bandwidth, int p_out_bandwidth) {
ERR_FAIL_COND_V_MSG(!p_bind_address.is_valid() && !p_bind_address.is_wildcard(), ERR_INVALID_PARAMETER, "Invalid bind IP.");
ERR_FAIL_COND_V_MSG(p_port < 0 || p_port > 65535, ERR_INVALID_PARAMETER, "The local port number must be between 0 and 65535 (inclusive).");
ENetAddress address;
memset(&address, 0, sizeof(address));
address.port = p_port;
#ifdef GODOT_ENET
if (p_bind_address.is_wildcard()) {
address.wildcard = 1;
} else {
enet_address_set_ip(&address, p_bind_address.get_ipv6(), 16);
}
#else
if (p_bind_address.is_wildcard()) {
address.host = 0;
} else {
ERR_FAIL_COND_V(!p_bind_address.is_ipv4(), ERR_INVALID_PARAMETER);
address.host = *(uint32_t *)p_bind_address.get_ipv4();
}
#endif
return _create(&address, p_max_peers, p_max_channels, p_in_bandwidth, p_out_bandwidth);
}
Error ENetConnection::create_host(int p_max_peers, int p_max_channels, int p_in_bandwidth, int p_out_bandwidth) {
return _create(nullptr, p_max_peers, p_max_channels, p_in_bandwidth, p_out_bandwidth);
}
void ENetConnection::destroy() {
ERR_FAIL_COND_MSG(!host, "Host already destroyed");
for (List<Ref<ENetPacketPeer>>::Element *E = peers.front(); E; E = E->next()) {
E->get()->_on_disconnect();
}
peers.clear();
enet_host_destroy(host);
host = nullptr;
}
Ref<ENetPacketPeer> ENetConnection::connect_to_host(const String &p_address, int p_port, int p_channels, int p_data) {
Ref<ENetPacketPeer> out;
ERR_FAIL_COND_V_MSG(!host, out, "The ENetConnection instance isn't currently active.");
ERR_FAIL_COND_V_MSG(peers.size(), out, "The ENetConnection is already connected to a peer.");
ERR_FAIL_COND_V_MSG(p_port < 1 || p_port > 65535, out, "The remote port number must be between 1 and 65535 (inclusive).");
IPAddress ip;
if (p_address.is_valid_ip_address()) {
ip = p_address;
} else {
#ifdef GODOT_ENET
ip = IP::get_singleton()->resolve_hostname(p_address);
#else
ip = IP::get_singleton()->resolve_hostname(p_address, IP::TYPE_IPV4);
#endif
ERR_FAIL_COND_V_MSG(!ip.is_valid(), out, "Couldn't resolve the server IP address or domain name.");
}
ENetAddress address;
#ifdef GODOT_ENET
enet_address_set_ip(&address, ip.get_ipv6(), 16);
#else
ERR_FAIL_COND_V_MSG(!ip.is_ipv4(), out, "Connecting to an IPv6 server isn't supported when using vanilla ENet. Recompile Godot with the bundled ENet library.");
address.host = *(uint32_t *)ip.get_ipv4();
#endif
address.port = p_port;
// Initiate connection, allocating enough channels
ENetPeer *peer = enet_host_connect(host, &address, p_channels > 0 ? p_channels : ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT, p_data);
if (peer == nullptr) {
return nullptr;
}
out = Ref<ENetPacketPeer>(memnew(ENetPacketPeer(peer)));
peers.push_back(out);
return out;
}
ENetConnection::EventType ENetConnection::_parse_event(const ENetEvent &p_event, Event &r_event) {
switch (p_event.type) {
case ENET_EVENT_TYPE_CONNECT: {
if (p_event.peer->data == nullptr) {
Ref<ENetPacketPeer> pp = memnew(ENetPacketPeer(p_event.peer));
peers.push_back(pp);
}
r_event.peer = Ref<ENetPacketPeer>((ENetPacketPeer *)p_event.peer->data);
r_event.data = p_event.data;
return EVENT_CONNECT;
} break;
case ENET_EVENT_TYPE_DISCONNECT: {
// A peer disconnected.
if (p_event.peer->data != nullptr) {
Ref<ENetPacketPeer> pp = Ref<ENetPacketPeer>((ENetPacketPeer *)p_event.peer->data);
pp->_on_disconnect();
peers.erase(pp);
r_event.peer = pp;
r_event.data = p_event.data;
return EVENT_DISCONNECT;
}
return EVENT_ERROR;
} break;
case ENET_EVENT_TYPE_RECEIVE: {
// Packet reveived.
if (p_event.peer->data != nullptr) {
Ref<ENetPacketPeer> pp = Ref<ENetPacketPeer>((ENetPacketPeer *)p_event.peer->data);
r_event.peer = Ref<ENetPacketPeer>((ENetPacketPeer *)p_event.peer->data);
r_event.channel_id = p_event.channelID;
r_event.packet = p_event.packet;
return EVENT_RECEIVE;
}
return EVENT_ERROR;
} break;
case ENET_EVENT_TYPE_NONE:
return EVENT_NONE;
default:
return EVENT_NONE;
}
}
ENetConnection::EventType ENetConnection::service(int p_timeout, Event &r_event) {
ERR_FAIL_COND_V_MSG(!host, EVENT_ERROR, "The ENetConnection instance isn't currently active.");
ERR_FAIL_COND_V(r_event.peer.is_valid(), EVENT_ERROR);
// Drop peers that have already been disconnected.
// NOTE: Forcibly disconnected peers (i.e. peers disconnected via
// enet_peer_disconnect*) do not trigger DISCONNECTED events.
List<Ref<ENetPacketPeer>>::Element *E = peers.front();
while (E) {
if (!E->get()->is_active()) {
peers.erase(E->get());
}
E = E->next();
}
ENetEvent event;
int ret = enet_host_service(host, &event, p_timeout);
if (ret < 0) {
return EVENT_ERROR;
} else if (ret == 0) {
return EVENT_NONE;
}
return _parse_event(event, r_event);
}
int ENetConnection::check_events(EventType &r_type, Event &r_event) {
ERR_FAIL_COND_V_MSG(!host, -1, "The ENetConnection instance isn't currently active.");
ENetEvent event;
int ret = enet_host_check_events(host, &event);
if (ret < 0) {
r_type = EVENT_ERROR;
return ret;
}
r_type = _parse_event(event, r_event);
return ret;
}
void ENetConnection::flush() {
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
enet_host_flush(host);
}
void ENetConnection::bandwidth_limit(int p_in_bandwidth, int p_out_bandwidth) {
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
enet_host_bandwidth_limit(host, p_in_bandwidth, p_out_bandwidth);
}
void ENetConnection::channel_limit(int p_max_channels) {
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
enet_host_channel_limit(host, p_max_channels);
}
void ENetConnection::bandwidth_throttle() {
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
enet_host_bandwidth_throttle(host);
}
void ENetConnection::compress(CompressionMode p_mode) {
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
Compressor::setup(host, p_mode);
}
double ENetConnection::pop_statistic(HostStatistic p_stat) {
ERR_FAIL_COND_V_MSG(!host, 0, "The ENetConnection instance isn't currently active.");
uint32_t *ptr = nullptr;
switch (p_stat) {
case HOST_TOTAL_SENT_DATA:
ptr = &(host->totalSentData);
break;
case HOST_TOTAL_SENT_PACKETS:
ptr = &(host->totalSentPackets);
break;
case HOST_TOTAL_RECEIVED_DATA:
ptr = &(host->totalReceivedData);
break;
case HOST_TOTAL_RECEIVED_PACKETS:
ptr = &(host->totalReceivedPackets);
break;
}
ERR_FAIL_COND_V_MSG(ptr == nullptr, 0, "Invalid statistic: " + itos(p_stat));
uint32_t ret = *ptr;
*ptr = 0;
return ret;
}
int ENetConnection::get_max_channels() const {
ERR_FAIL_COND_V_MSG(!host, 0, "The ENetConnection instance isn't currently active.");
return host->channelLimit;
}
int ENetConnection::get_local_port() const {
ERR_FAIL_COND_V_MSG(!host, 0, "The ENetConnection instance isn't currently active.");
ERR_FAIL_COND_V_MSG(!(host->socket), 0, "The ENetConnection instance isn't currently bound");
ENetAddress address;
ERR_FAIL_COND_V_MSG(enet_socket_get_address(host->socket, &address), 0, "Unable to get socket address");
return address.port;
}
void ENetConnection::get_peers(List<Ref<ENetPacketPeer>> &r_peers) {
for (const Ref<ENetPacketPeer> &I : peers) {
r_peers.push_back(I);
}
}
Array ENetConnection::_get_peers() {
ERR_FAIL_COND_V_MSG(!host, Array(), "The ENetConnection instance isn't currently active.");
Array out;
for (const Ref<ENetPacketPeer> &I : peers) {
out.push_back(I);
}
return out;
}
Error ENetConnection::dtls_server_setup(Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert) {
#ifdef GODOT_ENET
ERR_FAIL_COND_V_MSG(!host, ERR_UNCONFIGURED, "The ENetConnection instance isn't currently active.");
return enet_host_dtls_server_setup(host, p_key.ptr(), p_cert.ptr()) ? FAILED : OK;
#else
ERR_FAIL_V_MSG(ERR_UNAVAILABLE, "ENet DTLS support not available in this build.");
#endif
}
void ENetConnection::refuse_new_connections(bool p_refuse) {
#ifdef GODOT_ENET
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
enet_host_refuse_new_connections(host, p_refuse);
#else
ERR_FAIL_MSG("ENet DTLS support not available in this build.");
#endif
}
Error ENetConnection::dtls_client_setup(Ref<X509Certificate> p_cert, const String &p_hostname, bool p_verify) {
#ifdef GODOT_ENET
ERR_FAIL_COND_V_MSG(!host, ERR_UNCONFIGURED, "The ENetConnection instance isn't currently active.");
return enet_host_dtls_client_setup(host, p_cert.ptr(), p_verify, p_hostname.utf8().get_data()) ? FAILED : OK;
#else
ERR_FAIL_V_MSG(ERR_UNAVAILABLE, "ENet DTLS support not available in this build.");
#endif
}
Error ENetConnection::_create(ENetAddress *p_address, int p_max_peers, int p_max_channels, int p_in_bandwidth, int p_out_bandwidth) {
ERR_FAIL_COND_V_MSG(host != nullptr, ERR_ALREADY_IN_USE, "The ENetConnection instance is already active.");
ERR_FAIL_COND_V_MSG(p_max_peers < 1 || p_max_peers > 4095, ERR_INVALID_PARAMETER, "The number of clients must be set between 1 and 4095 (inclusive).");
ERR_FAIL_COND_V_MSG(p_max_channels < 0 || p_max_channels > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT, ERR_INVALID_PARAMETER, "Invalid channel count. Must be between 0 and 255 (0 means maximum, i.e. 255)");
ERR_FAIL_COND_V_MSG(p_in_bandwidth < 0, ERR_INVALID_PARAMETER, "The incoming bandwidth limit must be greater than or equal to 0 (0 disables the limit).");
ERR_FAIL_COND_V_MSG(p_out_bandwidth < 0, ERR_INVALID_PARAMETER, "The outgoing bandwidth limit must be greater than or equal to 0 (0 disables the limit).");
host = enet_host_create(p_address /* the address to bind the server host to */,
p_max_peers /* allow up to p_max_peers connections */,
p_max_channels /* allow up to p_max_channel to be used */,
p_in_bandwidth /* limit incoming bandwidth if > 0 */,
p_out_bandwidth /* limit outgoing bandwidth if > 0 */);
ERR_FAIL_COND_V_MSG(!host, ERR_CANT_CREATE, "Couldn't create an ENet host.");
return OK;
}
Array ENetConnection::_service(int p_timeout) {
Array out;
Event event;
Ref<ENetPacketPeer> peer;
EventType ret = service(p_timeout, event);
out.push_back(ret);
out.push_back(event.peer);
out.push_back(event.data);
out.push_back(event.channel_id);
if (event.packet && event.peer.is_valid()) {
event.peer->_queue_packet(event.packet);
}
return out;
}
void ENetConnection::_broadcast(int p_channel, PackedByteArray p_packet, int p_flags) {
ERR_FAIL_COND_MSG(!host, "The ENetConnection instance isn't currently active.");
ERR_FAIL_COND_MSG(p_channel < 0 || p_channel > (int)host->channelLimit, "Invalid channel");
ERR_FAIL_COND_MSG(p_flags & ~ENetPacketPeer::FLAG_ALLOWED, "Invalid flags");
ENetPacket *pkt = enet_packet_create(p_packet.ptr(), p_packet.size(), p_flags);
broadcast(p_channel, pkt);
}
void ENetConnection::_bind_methods() {
ClassDB::bind_method(D_METHOD("create_host_bound", "bind_address", "bind_port", "max_peers", "max_channels", "in_bandwidth", "out_bandwidth"), &ENetConnection::create_host_bound, DEFVAL(32), DEFVAL(0), DEFVAL(0), DEFVAL(0));
ClassDB::bind_method(D_METHOD("create_host", "max_peers", "max_channels", "in_bandwidth", "out_bandwidth"), &ENetConnection::create_host, DEFVAL(32), DEFVAL(0), DEFVAL(0), DEFVAL(0));
ClassDB::bind_method(D_METHOD("destroy"), &ENetConnection::destroy);
ClassDB::bind_method(D_METHOD("connect_to_host", "address", "port", "channels", "data"), &ENetConnection::connect_to_host, DEFVAL(0), DEFVAL(0));
ClassDB::bind_method(D_METHOD("service", "timeout"), &ENetConnection::_service, DEFVAL(0));
ClassDB::bind_method(D_METHOD("flush"), &ENetConnection::flush);
ClassDB::bind_method(D_METHOD("bandwidth_limit", "in_bandwidth", "out_bandwidth"), &ENetConnection::bandwidth_limit, DEFVAL(0), DEFVAL(0));
ClassDB::bind_method(D_METHOD("channel_limit", "limit"), &ENetConnection::channel_limit);
ClassDB::bind_method(D_METHOD("broadcast", "channel", "packet", "flags"), &ENetConnection::_broadcast);
ClassDB::bind_method(D_METHOD("compress", "mode"), &ENetConnection::compress);
ClassDB::bind_method(D_METHOD("dtls_server_setup", "key", "certificate"), &ENetConnection::dtls_server_setup);
ClassDB::bind_method(D_METHOD("dtls_client_setup", "certificate", "hostname", "verify"), &ENetConnection::dtls_client_setup, DEFVAL(true));
ClassDB::bind_method(D_METHOD("refuse_new_connections", "refuse"), &ENetConnection::refuse_new_connections);
ClassDB::bind_method(D_METHOD("pop_statistic", "statistic"), &ENetConnection::pop_statistic);
ClassDB::bind_method(D_METHOD("get_max_channels"), &ENetConnection::get_max_channels);
ClassDB::bind_method(D_METHOD("get_local_port"), &ENetConnection::get_local_port);
ClassDB::bind_method(D_METHOD("get_peers"), &ENetConnection::_get_peers);
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);
BIND_ENUM_CONSTANT(EVENT_ERROR);
BIND_ENUM_CONSTANT(EVENT_NONE);
BIND_ENUM_CONSTANT(EVENT_CONNECT);
BIND_ENUM_CONSTANT(EVENT_DISCONNECT);
BIND_ENUM_CONSTANT(EVENT_RECEIVE);
BIND_ENUM_CONSTANT(HOST_TOTAL_SENT_DATA);
BIND_ENUM_CONSTANT(HOST_TOTAL_SENT_PACKETS);
BIND_ENUM_CONSTANT(HOST_TOTAL_RECEIVED_DATA);
BIND_ENUM_CONSTANT(HOST_TOTAL_RECEIVED_PACKETS);
}
ENetConnection::~ENetConnection() {
if (host) {
destroy();
}
}
size_t ENetConnection::Compressor::enet_compress(void *context, const ENetBuffer *inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 *outData, size_t outLimit) {
Compressor *compressor = (Compressor *)(context);
if (size_t(compressor->src_mem.size()) < inLimit) {
compressor->src_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));
memcpy(&compressor->src_mem.write[ofs], inBuffers[i].data, to_copy);
ofs += to_copy;
total -= to_copy;
}
}
Compression::Mode mode;
switch (compressor->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_MSG(0, vformat("Invalid ENet compression mode: %d", compressor->mode));
}
}
int req_size = Compression::get_max_compressed_buffer_size(ofs, mode);
if (compressor->dst_mem.size() < req_size) {
compressor->dst_mem.resize(req_size);
}
int ret = Compression::compress(compressor->dst_mem.ptrw(), compressor->src_mem.ptr(), ofs, mode);
if (ret < 0) {
return 0;
}
if (ret > int(outLimit)) {
return 0; // Do not bother
}
memcpy(outData, compressor->dst_mem.ptr(), ret);
return ret;
}
size_t ENetConnection::Compressor::enet_decompress(void *context, const enet_uint8 *inData, size_t inLimit, enet_uint8 *outData, size_t outLimit) {
Compressor *compressor = (Compressor *)(context);
int ret = -1;
switch (compressor->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 ENetConnection::Compressor::setup(ENetHost *p_host, CompressionMode p_mode) {
ERR_FAIL_COND(!p_host);
switch (p_mode) {
case COMPRESS_NONE: {
enet_host_compress(p_host, nullptr);
} break;
case COMPRESS_RANGE_CODER: {
enet_host_compress_with_range_coder(p_host);
} break;
case COMPRESS_FASTLZ:
case COMPRESS_ZLIB:
case COMPRESS_ZSTD: {
Compressor *compressor = memnew(Compressor(p_mode));
enet_host_compress(p_host, &(compressor->enet_compressor));
} break;
}
}
ENetConnection::Compressor::Compressor(CompressionMode p_mode) {
mode = p_mode;
enet_compressor.context = this;
enet_compressor.compress = enet_compress;
enet_compressor.decompress = enet_decompress;
enet_compressor.destroy = enet_compressor_destroy;
}
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