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764b7abe82
The ENetDTLSServer socket implementation should avoid reporting errors during send and receive operations, unless the socket is effectively no longer usable (and thus ENet should close it).
609 lines
16 KiB
C++
609 lines
16 KiB
C++
/**************************************************************************/
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/* godot.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 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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/**
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@file godot.cpp
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@brief ENet Godot specific functions
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*/
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#include "core/io/dtls_server.h"
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#include "core/io/ip.h"
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#include "core/io/net_socket.h"
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#include "core/io/packet_peer_dtls.h"
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#include "core/io/udp_server.h"
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#include "core/os/os.h"
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// This must be last for windows to compile (tested with MinGW)
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#include "enet/enet.h"
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/// Abstract ENet interface for UDP/DTLS.
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class ENetGodotSocket {
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public:
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virtual Error bind(IPAddress p_ip, uint16_t p_port) = 0;
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virtual Error get_socket_address(IPAddress *r_ip, uint16_t *r_port) = 0;
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virtual Error sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IPAddress p_ip, uint16_t p_port) = 0;
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virtual Error recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IPAddress &r_ip, uint16_t &r_port) = 0;
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virtual int set_option(ENetSocketOption p_option, int p_value) = 0;
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virtual void close() = 0;
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virtual void set_refuse_new_connections(bool p_enable) {} /* Only used by dtls server */
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virtual bool can_upgrade() { return false; } /* Only true in ENetUDP */
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virtual ~ENetGodotSocket() {}
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};
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class ENetDTLSClient;
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class ENetDTLSServer;
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/// NetSocket interface
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class ENetUDP : public ENetGodotSocket {
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friend class ENetDTLSClient;
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friend class ENetDTLSServer;
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private:
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Ref<NetSocket> sock;
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IPAddress local_address;
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bool bound = false;
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public:
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ENetUDP() {
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sock = Ref<NetSocket>(NetSocket::create());
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IP::Type ip_type = IP::TYPE_ANY;
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sock->open(NetSocket::TYPE_UDP, ip_type);
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}
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~ENetUDP() {
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sock->close();
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}
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bool can_upgrade() {
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return true;
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}
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Error bind(IPAddress p_ip, uint16_t p_port) {
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local_address = p_ip;
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bound = true;
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return sock->bind(p_ip, p_port);
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}
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Error get_socket_address(IPAddress *r_ip, uint16_t *r_port) {
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Error err = sock->get_socket_address(r_ip, r_port);
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if (bound) {
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*r_ip = local_address;
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}
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return err;
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}
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Error sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IPAddress p_ip, uint16_t p_port) {
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return sock->sendto(p_buffer, p_len, r_sent, p_ip, p_port);
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}
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Error recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IPAddress &r_ip, uint16_t &r_port) {
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Error err = sock->poll(NetSocket::POLL_TYPE_IN, 0);
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if (err != OK) {
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return err;
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}
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return sock->recvfrom(p_buffer, p_len, r_read, r_ip, r_port);
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}
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int set_option(ENetSocketOption p_option, int p_value) {
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switch (p_option) {
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case ENET_SOCKOPT_NONBLOCK: {
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sock->set_blocking_enabled(p_value ? false : true);
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return 0;
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} break;
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case ENET_SOCKOPT_BROADCAST: {
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sock->set_broadcasting_enabled(p_value ? true : false);
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return 0;
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} break;
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case ENET_SOCKOPT_REUSEADDR: {
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sock->set_reuse_address_enabled(p_value ? true : false);
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return 0;
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} break;
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case ENET_SOCKOPT_RCVBUF: {
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return -1;
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} break;
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case ENET_SOCKOPT_SNDBUF: {
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return -1;
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} break;
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case ENET_SOCKOPT_RCVTIMEO: {
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return -1;
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} break;
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case ENET_SOCKOPT_SNDTIMEO: {
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return -1;
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} break;
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case ENET_SOCKOPT_NODELAY: {
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sock->set_tcp_no_delay_enabled(p_value ? true : false);
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return 0;
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} break;
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}
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return -1;
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}
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void close() {
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sock->close();
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local_address.clear();
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}
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};
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/// DTLS Client ENet interface
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class ENetDTLSClient : public ENetGodotSocket {
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bool connected = false;
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Ref<PacketPeerUDP> udp;
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Ref<PacketPeerDTLS> dtls;
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Ref<TLSOptions> tls_options;
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String for_hostname;
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IPAddress local_address;
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public:
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ENetDTLSClient(ENetUDP *p_base, String p_for_hostname, Ref<TLSOptions> p_options) {
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for_hostname = p_for_hostname;
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tls_options = p_options;
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udp.instantiate();
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dtls = Ref<PacketPeerDTLS>(PacketPeerDTLS::create());
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if (p_base->bound) {
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uint16_t port;
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p_base->get_socket_address(&local_address, &port);
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p_base->close();
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bind(local_address, port);
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}
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}
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~ENetDTLSClient() {
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close();
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}
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Error bind(IPAddress p_ip, uint16_t p_port) {
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local_address = p_ip;
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return udp->bind(p_port, p_ip);
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}
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Error get_socket_address(IPAddress *r_ip, uint16_t *r_port) {
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if (!udp->is_bound()) {
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return ERR_UNCONFIGURED;
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}
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*r_ip = local_address;
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*r_port = udp->get_local_port();
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return OK;
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}
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Error sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IPAddress p_ip, uint16_t p_port) {
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if (!connected) {
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udp->connect_to_host(p_ip, p_port);
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if (dtls->connect_to_peer(udp, for_hostname, tls_options)) {
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return FAILED;
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}
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connected = true;
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}
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dtls->poll();
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if (dtls->get_status() == PacketPeerDTLS::STATUS_HANDSHAKING) {
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return ERR_BUSY;
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} else if (dtls->get_status() != PacketPeerDTLS::STATUS_CONNECTED) {
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return FAILED;
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}
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r_sent = p_len;
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return dtls->put_packet(p_buffer, p_len);
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}
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Error recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IPAddress &r_ip, uint16_t &r_port) {
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dtls->poll();
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if (dtls->get_status() == PacketPeerDTLS::STATUS_HANDSHAKING) {
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return ERR_BUSY;
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}
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if (dtls->get_status() != PacketPeerDTLS::STATUS_CONNECTED) {
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return FAILED;
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}
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int pc = dtls->get_available_packet_count();
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if (pc == 0) {
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return ERR_BUSY;
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} else if (pc < 0) {
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return FAILED;
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}
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const uint8_t *buffer;
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Error err = dtls->get_packet(&buffer, r_read);
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ERR_FAIL_COND_V(err != OK, err);
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ERR_FAIL_COND_V(p_len < r_read, ERR_OUT_OF_MEMORY);
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memcpy(p_buffer, buffer, r_read);
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r_ip = udp->get_packet_address();
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r_port = udp->get_packet_port();
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return err;
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}
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int set_option(ENetSocketOption p_option, int p_value) {
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return -1;
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}
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void close() {
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dtls->disconnect_from_peer();
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udp->close();
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}
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};
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/// DTLSServer - ENet interface
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class ENetDTLSServer : public ENetGodotSocket {
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Ref<DTLSServer> server;
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Ref<UDPServer> udp_server;
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HashMap<String, Ref<PacketPeerDTLS>> peers;
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int last_service = 0;
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IPAddress local_address;
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public:
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ENetDTLSServer(ENetUDP *p_base, Ref<TLSOptions> p_options) {
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udp_server.instantiate();
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if (p_base->bound) {
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uint16_t port;
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p_base->get_socket_address(&local_address, &port);
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p_base->close();
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bind(local_address, port);
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}
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server = Ref<DTLSServer>(DTLSServer::create());
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server->setup(p_options);
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}
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~ENetDTLSServer() {
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close();
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}
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void set_refuse_new_connections(bool p_refuse) {
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udp_server->set_max_pending_connections(p_refuse ? 0 : 16);
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}
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Error bind(IPAddress p_ip, uint16_t p_port) {
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local_address = p_ip;
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return udp_server->listen(p_port, p_ip);
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}
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Error get_socket_address(IPAddress *r_ip, uint16_t *r_port) {
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if (!udp_server->is_listening()) {
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return ERR_UNCONFIGURED;
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}
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*r_ip = local_address;
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*r_port = udp_server->get_local_port();
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return OK;
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}
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Error sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IPAddress p_ip, uint16_t p_port) {
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String key = String(p_ip) + ":" + itos(p_port);
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if (unlikely(!peers.has(key))) {
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// The peer might have been disconnected due to a DTLS error.
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// We need to wait for it to time out, just mark the packet as sent.
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r_sent = p_len;
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return OK;
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}
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Ref<PacketPeerDTLS> peer = peers[key];
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Error err = peer->put_packet(p_buffer, p_len);
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if (err == OK) {
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r_sent = p_len;
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} else if (err == ERR_BUSY) {
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r_sent = 0;
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} else {
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// The peer might have been disconnected due to a DTLS error.
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// We need to wait for it to time out, just mark the packet as sent.
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r_sent = p_len;
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return OK;
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}
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return err;
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}
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Error recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IPAddress &r_ip, uint16_t &r_port) {
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udp_server->poll();
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// TODO limits? Maybe we can better enforce allowed connections!
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if (udp_server->is_connection_available()) {
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Ref<PacketPeerUDP> udp = udp_server->take_connection();
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IPAddress peer_ip = udp->get_packet_address();
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int peer_port = udp->get_packet_port();
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Ref<PacketPeerDTLS> peer = server->take_connection(udp);
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PacketPeerDTLS::Status status = peer->get_status();
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if (status == PacketPeerDTLS::STATUS_HANDSHAKING || status == PacketPeerDTLS::STATUS_CONNECTED) {
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String key = String(peer_ip) + ":" + itos(peer_port);
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peers[key] = peer;
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}
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}
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List<String> remove;
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Error err = ERR_BUSY;
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// TODO this needs to be fair!
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for (KeyValue<String, Ref<PacketPeerDTLS>> &E : peers) {
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Ref<PacketPeerDTLS> peer = E.value;
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peer->poll();
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if (peer->get_status() == PacketPeerDTLS::STATUS_HANDSHAKING) {
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continue;
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} else if (peer->get_status() != PacketPeerDTLS::STATUS_CONNECTED) {
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// Peer disconnected, removing it.
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remove.push_back(E.key);
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continue;
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}
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if (peer->get_available_packet_count() > 0) {
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const uint8_t *buffer;
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err = peer->get_packet(&buffer, r_read);
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if (err != OK || p_len < r_read) {
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// Something wrong with this peer, removing it.
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remove.push_back(E.key);
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err = ERR_BUSY;
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r_read = 0;
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continue;
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}
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Vector<String> s = E.key.rsplit(":", false, 1);
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ERR_CONTINUE(s.size() != 2); // BUG!
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memcpy(p_buffer, buffer, r_read);
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r_ip = s[0];
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r_port = s[1].to_int();
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break; // err = OK
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}
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}
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// Remove disconnected peers from map.
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for (String &E : remove) {
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peers.erase(E);
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}
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return err; // OK, ERR_BUSY, or possibly an error.
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}
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int set_option(ENetSocketOption p_option, int p_value) {
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return -1;
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}
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void close() {
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for (KeyValue<String, Ref<PacketPeerDTLS>> &E : peers) {
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E.value->disconnect_from_peer();
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}
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peers.clear();
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udp_server->stop();
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server->stop();
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local_address.clear();
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}
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};
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static enet_uint32 timeBase = 0;
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int enet_initialize(void) {
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return 0;
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}
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void enet_deinitialize(void) {
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}
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enet_uint32 enet_host_random_seed(void) {
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return (enet_uint32)OS::get_singleton()->get_unix_time();
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}
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enet_uint32 enet_time_get(void) {
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return OS::get_singleton()->get_ticks_msec() - timeBase;
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}
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void enet_time_set(enet_uint32 newTimeBase) {
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timeBase = OS::get_singleton()->get_ticks_msec() - newTimeBase;
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}
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int enet_address_set_host(ENetAddress *address, const char *name) {
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IPAddress ip = IP::get_singleton()->resolve_hostname(name);
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ERR_FAIL_COND_V(!ip.is_valid(), -1);
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enet_address_set_ip(address, ip.get_ipv6(), 16);
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return 0;
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}
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void enet_address_set_ip(ENetAddress *address, const uint8_t *ip, size_t size) {
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int len = size > 16 ? 16 : size;
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memset(address->host, 0, 16);
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memcpy(address->host, ip, len);
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}
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int enet_address_get_host_ip(const ENetAddress *address, char *name, size_t nameLength) {
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return -1;
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}
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int enet_address_get_host(const ENetAddress *address, char *name, size_t nameLength) {
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return -1;
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}
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ENetSocket enet_socket_create(ENetSocketType type) {
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ENetUDP *socket = memnew(ENetUDP);
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return socket;
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}
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int enet_host_dtls_server_setup(ENetHost *host, void *p_options) {
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ERR_FAIL_COND_V_MSG(!DTLSServer::is_available(), -1, "DTLS server is not available in this build.");
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ENetGodotSocket *sock = (ENetGodotSocket *)host->socket;
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if (!sock->can_upgrade()) {
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return -1;
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}
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host->socket = memnew(ENetDTLSServer(static_cast<ENetUDP *>(sock), Ref<TLSOptions>(static_cast<TLSOptions *>(p_options))));
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memdelete(sock);
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return 0;
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}
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int enet_host_dtls_client_setup(ENetHost *host, const char *p_for_hostname, void *p_options) {
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ERR_FAIL_COND_V_MSG(!PacketPeerDTLS::is_available(), -1, "DTLS is not available in this build.");
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ENetGodotSocket *sock = (ENetGodotSocket *)host->socket;
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if (!sock->can_upgrade()) {
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return -1;
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}
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host->socket = memnew(ENetDTLSClient(static_cast<ENetUDP *>(sock), String::utf8(p_for_hostname), Ref<TLSOptions>(static_cast<TLSOptions *>(p_options))));
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memdelete(sock);
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return 0;
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}
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void enet_host_refuse_new_connections(ENetHost *host, int p_refuse) {
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ERR_FAIL_NULL(host->socket);
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((ENetGodotSocket *)host->socket)->set_refuse_new_connections(p_refuse);
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}
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int enet_socket_bind(ENetSocket socket, const ENetAddress *address) {
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IPAddress ip;
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if (address->wildcard) {
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ip = IPAddress("*");
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} else {
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ip.set_ipv6(address->host);
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}
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ENetGodotSocket *sock = (ENetGodotSocket *)socket;
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if (sock->bind(ip, address->port) != OK) {
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return -1;
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}
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return 0;
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}
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void enet_socket_destroy(ENetSocket socket) {
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ENetGodotSocket *sock = (ENetGodotSocket *)socket;
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sock->close();
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memdelete(sock);
|
|
}
|
|
|
|
int enet_socket_send(ENetSocket socket, const ENetAddress *address, const ENetBuffer *buffers, size_t bufferCount) {
|
|
ERR_FAIL_NULL_V(address, -1);
|
|
|
|
ENetGodotSocket *sock = (ENetGodotSocket *)socket;
|
|
IPAddress dest;
|
|
Error err;
|
|
size_t i = 0;
|
|
|
|
dest.set_ipv6(address->host);
|
|
|
|
// Create a single packet.
|
|
Vector<uint8_t> out;
|
|
uint8_t *w;
|
|
int size = 0;
|
|
int pos = 0;
|
|
for (i = 0; i < bufferCount; i++) {
|
|
size += buffers[i].dataLength;
|
|
}
|
|
|
|
out.resize(size);
|
|
w = out.ptrw();
|
|
for (i = 0; i < bufferCount; i++) {
|
|
memcpy(&w[pos], buffers[i].data, buffers[i].dataLength);
|
|
pos += buffers[i].dataLength;
|
|
}
|
|
|
|
int sent = 0;
|
|
err = sock->sendto((const uint8_t *)&w[0], size, sent, dest, address->port);
|
|
if (err != OK) {
|
|
if (err == ERR_BUSY) { // Blocking call
|
|
return 0;
|
|
}
|
|
|
|
WARN_PRINT("Sending failed!");
|
|
return -1;
|
|
}
|
|
|
|
return sent;
|
|
}
|
|
|
|
int enet_socket_receive(ENetSocket socket, ENetAddress *address, ENetBuffer *buffers, size_t bufferCount) {
|
|
ERR_FAIL_COND_V(bufferCount != 1, -1);
|
|
|
|
ENetGodotSocket *sock = (ENetGodotSocket *)socket;
|
|
|
|
int read;
|
|
IPAddress ip;
|
|
|
|
Error err = sock->recvfrom((uint8_t *)buffers[0].data, buffers[0].dataLength, read, ip, address->port);
|
|
if (err == ERR_BUSY) {
|
|
return 0;
|
|
}
|
|
if (err == ERR_OUT_OF_MEMORY) {
|
|
// A packet above the ENET_PROTOCOL_MAXIMUM_MTU was received.
|
|
return -2;
|
|
}
|
|
|
|
if (err != OK) {
|
|
return -1;
|
|
}
|
|
|
|
enet_address_set_ip(address, ip.get_ipv6(), 16);
|
|
|
|
return read;
|
|
}
|
|
|
|
int enet_socket_get_address(ENetSocket socket, ENetAddress *address) {
|
|
IPAddress ip;
|
|
uint16_t port;
|
|
ENetGodotSocket *sock = (ENetGodotSocket *)socket;
|
|
|
|
if (sock->get_socket_address(&ip, &port) != OK) {
|
|
return -1;
|
|
}
|
|
|
|
enet_address_set_ip(address, ip.get_ipv6(), 16);
|
|
address->port = port;
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Not implemented
|
|
int enet_socket_wait(ENetSocket socket, enet_uint32 *condition, enet_uint32 timeout) {
|
|
return 0; // do we need this function?
|
|
}
|
|
|
|
int enet_socketset_select(ENetSocket maxSocket, ENetSocketSet *readSet, ENetSocketSet *writeSet, enet_uint32 timeout) {
|
|
return -1;
|
|
}
|
|
|
|
int enet_socket_listen(ENetSocket socket, int backlog) {
|
|
return -1;
|
|
}
|
|
|
|
int enet_socket_set_option(ENetSocket socket, ENetSocketOption option, int value) {
|
|
ENetGodotSocket *sock = (ENetGodotSocket *)socket;
|
|
return sock->set_option(option, value);
|
|
}
|
|
|
|
int enet_socket_get_option(ENetSocket socket, ENetSocketOption option, int *value) {
|
|
return -1;
|
|
}
|
|
|
|
int enet_socket_connect(ENetSocket socket, const ENetAddress *address) {
|
|
return -1;
|
|
}
|
|
|
|
ENetSocket enet_socket_accept(ENetSocket socket, ENetAddress *address) {
|
|
return nullptr;
|
|
}
|
|
|
|
int enet_socket_shutdown(ENetSocket socket, ENetSocketShutdown how) {
|
|
return -1;
|
|
}
|