godot/core/io/packet_peer_udp.cpp
Fabio Alessandrelli 4b6a35c74a Disable SO_REUSEADDR for UDP.
It allows binding multiple sockets to the same ADDR:PORT (unlike TCP,
which still requires different ADDR:PORT combinations).
2020-11-27 14:12:34 +01:00

360 lines
11 KiB
C++

/*************************************************************************/
/* packet_peer_udp.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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.*/
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/*************************************************************************/
#include "packet_peer_udp.h"
#include "core/io/ip.h"
#include "core/io/udp_server.h"
void PacketPeerUDP::set_blocking_mode(bool p_enable) {
blocking = p_enable;
}
void PacketPeerUDP::set_broadcast_enabled(bool p_enabled) {
ERR_FAIL_COND(udp_server);
broadcast = p_enabled;
if (_sock.is_valid() && _sock->is_open()) {
_sock->set_broadcasting_enabled(p_enabled);
}
}
Error PacketPeerUDP::join_multicast_group(IP_Address p_multi_address, String p_if_name) {
ERR_FAIL_COND_V(udp_server, ERR_LOCKED);
ERR_FAIL_COND_V(!_sock.is_valid(), ERR_UNAVAILABLE);
ERR_FAIL_COND_V(!p_multi_address.is_valid(), ERR_INVALID_PARAMETER);
if (!_sock->is_open()) {
IP::Type ip_type = p_multi_address.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
Error err = _sock->open(NetSocket::TYPE_UDP, ip_type);
ERR_FAIL_COND_V(err != OK, err);
_sock->set_blocking_enabled(false);
_sock->set_broadcasting_enabled(broadcast);
}
return _sock->join_multicast_group(p_multi_address, p_if_name);
}
Error PacketPeerUDP::leave_multicast_group(IP_Address p_multi_address, String p_if_name) {
ERR_FAIL_COND_V(udp_server, ERR_LOCKED);
ERR_FAIL_COND_V(!_sock.is_valid(), ERR_UNAVAILABLE);
ERR_FAIL_COND_V(!_sock->is_open(), ERR_UNCONFIGURED);
return _sock->leave_multicast_group(p_multi_address, p_if_name);
}
String PacketPeerUDP::_get_packet_ip() const {
return get_packet_address();
}
Error PacketPeerUDP::_set_dest_address(const String &p_address, int p_port) {
IP_Address ip;
if (p_address.is_valid_ip_address()) {
ip = p_address;
} else {
ip = IP::get_singleton()->resolve_hostname(p_address);
if (!ip.is_valid()) {
return ERR_CANT_RESOLVE;
}
}
set_dest_address(ip, p_port);
return OK;
}
int PacketPeerUDP::get_available_packet_count() const {
// TODO we should deprecate this, and expose poll instead!
Error err = const_cast<PacketPeerUDP *>(this)->_poll();
if (err != OK) {
return -1;
}
return queue_count;
}
Error PacketPeerUDP::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
Error err = _poll();
if (err != OK) {
return err;
}
if (queue_count == 0) {
return ERR_UNAVAILABLE;
}
uint32_t size = 0;
uint8_t ipv6[16];
rb.read(ipv6, 16, true);
packet_ip.set_ipv6(ipv6);
rb.read((uint8_t *)&packet_port, 4, true);
rb.read((uint8_t *)&size, 4, true);
rb.read(packet_buffer, size, true);
--queue_count;
*r_buffer = packet_buffer;
r_buffer_size = size;
return OK;
}
Error PacketPeerUDP::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V(!_sock.is_valid(), ERR_UNAVAILABLE);
ERR_FAIL_COND_V(!peer_addr.is_valid(), ERR_UNCONFIGURED);
Error err;
int sent = -1;
if (!_sock->is_open()) {
IP::Type ip_type = peer_addr.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
err = _sock->open(NetSocket::TYPE_UDP, ip_type);
ERR_FAIL_COND_V(err != OK, err);
_sock->set_blocking_enabled(false);
_sock->set_broadcasting_enabled(broadcast);
}
do {
if (connected && !udp_server) {
err = _sock->send(p_buffer, p_buffer_size, sent);
} else {
err = _sock->sendto(p_buffer, p_buffer_size, sent, peer_addr, peer_port);
}
if (err != OK) {
if (err != ERR_BUSY) {
return FAILED;
} else if (!blocking) {
return ERR_BUSY;
}
// Keep trying to send full packet
continue;
}
return OK;
} while (sent != p_buffer_size);
return OK;
}
int PacketPeerUDP::get_max_packet_size() const {
return 512; // uhm maybe not
}
Error PacketPeerUDP::listen(int p_port, const IP_Address &p_bind_address, int p_recv_buffer_size) {
ERR_FAIL_COND_V(!_sock.is_valid(), ERR_UNAVAILABLE);
ERR_FAIL_COND_V(_sock->is_open(), ERR_ALREADY_IN_USE);
ERR_FAIL_COND_V(!p_bind_address.is_valid() && !p_bind_address.is_wildcard(), ERR_INVALID_PARAMETER);
Error err;
IP::Type ip_type = IP::TYPE_ANY;
if (p_bind_address.is_valid()) {
ip_type = p_bind_address.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
}
err = _sock->open(NetSocket::TYPE_UDP, ip_type);
if (err != OK) {
return ERR_CANT_CREATE;
}
_sock->set_blocking_enabled(false);
_sock->set_broadcasting_enabled(broadcast);
err = _sock->bind(p_bind_address, p_port);
if (err != OK) {
_sock->close();
return err;
}
rb.resize(nearest_shift(p_recv_buffer_size));
return OK;
}
Error PacketPeerUDP::connect_shared_socket(Ref<NetSocket> p_sock, IP_Address p_ip, uint16_t p_port, UDPServer *p_server) {
udp_server = p_server;
connected = true;
_sock = p_sock;
peer_addr = p_ip;
peer_port = p_port;
packet_ip = peer_addr;
packet_port = peer_port;
return OK;
}
void PacketPeerUDP::disconnect_shared_socket() {
udp_server = nullptr;
_sock = Ref<NetSocket>(NetSocket::create());
close();
}
Error PacketPeerUDP::connect_to_host(const IP_Address &p_host, int p_port) {
ERR_FAIL_COND_V(udp_server, ERR_LOCKED);
ERR_FAIL_COND_V(!_sock.is_valid(), ERR_UNAVAILABLE);
ERR_FAIL_COND_V(!p_host.is_valid(), ERR_INVALID_PARAMETER);
Error err;
if (!_sock->is_open()) {
IP::Type ip_type = p_host.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
err = _sock->open(NetSocket::TYPE_UDP, ip_type);
ERR_FAIL_COND_V(err != OK, ERR_CANT_OPEN);
_sock->set_blocking_enabled(false);
}
err = _sock->connect_to_host(p_host, p_port);
// I see no reason why we should get ERR_BUSY (wouldblock/eagain) here.
// This is UDP, so connect is only used to tell the OS to which socket
// it shuold deliver packets when multiple are bound on the same address/port.
if (err != OK) {
close();
ERR_FAIL_V_MSG(FAILED, "Unable to connect");
}
connected = true;
peer_addr = p_host;
peer_port = p_port;
// Flush any packet we might still have in queue.
rb.clear();
return OK;
}
bool PacketPeerUDP::is_connected_to_host() const {
return connected;
}
void PacketPeerUDP::close() {
if (udp_server) {
udp_server->remove_peer(peer_addr, peer_port);
udp_server = nullptr;
_sock = Ref<NetSocket>(NetSocket::create());
} else if (_sock.is_valid()) {
_sock->close();
}
rb.resize(16);
queue_count = 0;
connected = false;
}
Error PacketPeerUDP::wait() {
ERR_FAIL_COND_V(!_sock.is_valid(), ERR_UNAVAILABLE);
return _sock->poll(NetSocket::POLL_TYPE_IN, -1);
}
Error PacketPeerUDP::_poll() {
ERR_FAIL_COND_V(!_sock.is_valid(), ERR_UNAVAILABLE);
if (!_sock->is_open()) {
return FAILED;
}
if (udp_server) {
return OK; // Handled by UDPServer.
}
Error err;
int read;
IP_Address ip;
uint16_t port;
while (true) {
if (connected) {
err = _sock->recv(recv_buffer, sizeof(recv_buffer), read);
ip = peer_addr;
port = peer_port;
} else {
err = _sock->recvfrom(recv_buffer, sizeof(recv_buffer), read, ip, port);
}
if (err != OK) {
if (err == ERR_BUSY) {
break;
}
return FAILED;
}
err = store_packet(ip, port, recv_buffer, read);
#ifdef TOOLS_ENABLED
if (err != OK) {
WARN_PRINT("Buffer full, dropping packets!");
}
#endif
}
return OK;
}
Error PacketPeerUDP::store_packet(IP_Address p_ip, uint32_t p_port, uint8_t *p_buf, int p_buf_size) {
if (rb.space_left() < p_buf_size + 24) {
return ERR_OUT_OF_MEMORY;
}
rb.write(p_ip.get_ipv6(), 16);
rb.write((uint8_t *)&p_port, 4);
rb.write((uint8_t *)&p_buf_size, 4);
rb.write(p_buf, p_buf_size);
++queue_count;
return OK;
}
bool PacketPeerUDP::is_listening() const {
return _sock.is_valid() && _sock->is_open();
}
IP_Address PacketPeerUDP::get_packet_address() const {
return packet_ip;
}
int PacketPeerUDP::get_packet_port() const {
return packet_port;
}
void PacketPeerUDP::set_dest_address(const IP_Address &p_address, int p_port) {
ERR_FAIL_COND_MSG(connected, "Destination address cannot be set for connected sockets");
peer_addr = p_address;
peer_port = p_port;
}
void PacketPeerUDP::_bind_methods() {
ClassDB::bind_method(D_METHOD("listen", "port", "bind_address", "recv_buf_size"), &PacketPeerUDP::listen, DEFVAL("*"), DEFVAL(65536));
ClassDB::bind_method(D_METHOD("close"), &PacketPeerUDP::close);
ClassDB::bind_method(D_METHOD("wait"), &PacketPeerUDP::wait);
ClassDB::bind_method(D_METHOD("is_listening"), &PacketPeerUDP::is_listening);
ClassDB::bind_method(D_METHOD("connect_to_host", "host", "port"), &PacketPeerUDP::connect_to_host);
ClassDB::bind_method(D_METHOD("is_connected_to_host"), &PacketPeerUDP::is_connected_to_host);
ClassDB::bind_method(D_METHOD("get_packet_ip"), &PacketPeerUDP::_get_packet_ip);
ClassDB::bind_method(D_METHOD("get_packet_port"), &PacketPeerUDP::get_packet_port);
ClassDB::bind_method(D_METHOD("set_dest_address", "host", "port"), &PacketPeerUDP::_set_dest_address);
ClassDB::bind_method(D_METHOD("set_broadcast_enabled", "enabled"), &PacketPeerUDP::set_broadcast_enabled);
ClassDB::bind_method(D_METHOD("join_multicast_group", "multicast_address", "interface_name"), &PacketPeerUDP::join_multicast_group);
ClassDB::bind_method(D_METHOD("leave_multicast_group", "multicast_address", "interface_name"), &PacketPeerUDP::leave_multicast_group);
}
PacketPeerUDP::PacketPeerUDP() :
_sock(Ref<NetSocket>(NetSocket::create())) {
rb.resize(16);
}
PacketPeerUDP::~PacketPeerUDP() {
close();
}