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godot/core/io/packet_peer_udp.cpp

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/*************************************************************************/
/* 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.*/
/* 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 "packet_peer_udp.h"
#include "core/io/ip.h"
void PacketPeerUDP::set_blocking_mode(bool p_enable) {
blocking = p_enable;
}
void PacketPeerUDP::set_broadcast_enabled(bool p_enabled) {
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(!_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(!_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 {
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_reuse_address_enabled(true);
_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;
}
void PacketPeerUDP::close() {
if (_sock.is_valid())
_sock->close();
rb.resize(16);
queue_count = 0;
}
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;
}
Error err;
int read;
IP_Address ip;
uint16_t port;
while (true) {
err = _sock->recvfrom(recv_buffer, sizeof(recv_buffer), read, ip, port);
if (err != OK) {
if (err == ERR_BUSY)
break;
return FAILED;
}
if (rb.space_left() < read + 24) {
#ifdef TOOLS_ENABLED
WARN_PRINT("Buffer full, dropping packets!");
#endif
continue;
}
uint32_t port32 = port;
rb.write(ip.get_ipv6(), 16);
rb.write((uint8_t *)&port32, 4);
rb.write((uint8_t *)&read, 4);
rb.write(recv_buffer, read);
++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) {
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("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() :
packet_port(0),
queue_count(0),
peer_port(0),
blocking(true),
broadcast(false),
_sock(Ref<NetSocket>(NetSocket::create())) {
rb.resize(16);
}
PacketPeerUDP::~PacketPeerUDP() {
close();
}
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