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Merge pull request #36296 from Faless/dtls/enet_vulkan

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DTLS support + optional ENet encryption
This commit is contained in:
Rémi Verschelde
2020-02-18 15:01:53 +01:00
committed by GitHub
parent 213a85521d 9eea2cf9d6
commit 27326f8238
29 changed files with 1803 additions and 74 deletions
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core/io/dtls_server.cpp
+54
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@@ -0,0 +1,54 @@
/*************************************************************************/
/* dtls_server.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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 "dtls_server.h"
#include "core/os/file_access.h"
#include "core/project_settings.h"
DTLSServer *(*DTLSServer::_create)() = NULL;
bool DTLSServer::available = false;
DTLSServer *DTLSServer::create() {
return _create();
}
bool DTLSServer::is_available() {
return available;
}
void DTLSServer::_bind_methods() {
ClassDB::bind_method(D_METHOD("setup", "key", "certificate", "chain"), &DTLSServer::setup, DEFVAL(Ref<X509Certificate>()));
ClassDB::bind_method(D_METHOD("take_connection", "udp_peer"), &DTLSServer::take_connection);
}
DTLSServer::DTLSServer() {
}
core/io/dtls_server.h
+57
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@@ -0,0 +1,57 @@
/*************************************************************************/
/* dtls_server.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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. */
/*************************************************************************/
#ifndef DTLS_SERVER_H
#define DTLS_SERVER_H
#include "core/io/net_socket.h"
#include "core/io/packet_peer_dtls.h"
class DTLSServer : public Reference {
GDCLASS(DTLSServer, Reference);
protected:
static DTLSServer *(*_create)();
static void _bind_methods();
static bool available;
public:
static bool is_available();
static DTLSServer *create();
virtual Error setup(Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain = Ref<X509Certificate>()) = 0;
virtual void stop() = 0;
virtual Ref<PacketPeerDTLS> take_connection(Ref<PacketPeerUDP> p_peer) = 0;
DTLSServer();
};
#endif // DTLS_SERVER_H
core/io/net_socket.h
+1 -1
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@@ -61,7 +61,7 @@ public:
virtual Error connect_to_host(IP_Address p_addr, uint16_t p_port) = 0;
virtual Error poll(PollType p_type, int timeout) const = 0;
virtual Error recv(uint8_t *p_buffer, int p_len, int &r_read) = 0;
virtual Error recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IP_Address &r_ip, uint16_t &r_port) = 0;
virtual Error recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IP_Address &r_ip, uint16_t &r_port, bool p_peek = false) = 0;
virtual Error send(const uint8_t *p_buffer, int p_len, int &r_sent) = 0;
virtual Error sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IP_Address p_ip, uint16_t p_port) = 0;
virtual Ref<NetSocket> accept(IP_Address &r_ip, uint16_t &r_port) = 0;
core/io/packet_peer_dtls.cpp
+62
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@@ -0,0 +1,62 @@
/*************************************************************************/
/* packet_peer_dtls.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 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_dtls.h"
#include "core/os/file_access.h"
#include "core/project_settings.h"
PacketPeerDTLS *(*PacketPeerDTLS::_create)() = NULL;
bool PacketPeerDTLS::available = false;
PacketPeerDTLS *PacketPeerDTLS::create() {
return _create();
}
bool PacketPeerDTLS::is_available() {
return available;
}
void PacketPeerDTLS::_bind_methods() {
ClassDB::bind_method(D_METHOD("poll"), &PacketPeerDTLS::poll);
ClassDB::bind_method(D_METHOD("connect_to_peer", "packet_peer", "validate_certs", "for_hostname", "valid_certificate"), &PacketPeerDTLS::connect_to_peer, DEFVAL(true), DEFVAL(String()), DEFVAL(Ref<X509Certificate>()));
ClassDB::bind_method(D_METHOD("get_status"), &PacketPeerDTLS::get_status);
ClassDB::bind_method(D_METHOD("disconnect_from_peer"), &PacketPeerDTLS::disconnect_from_peer);
BIND_ENUM_CONSTANT(STATUS_DISCONNECTED);
BIND_ENUM_CONSTANT(STATUS_HANDSHAKING);
BIND_ENUM_CONSTANT(STATUS_CONNECTED);
BIND_ENUM_CONSTANT(STATUS_ERROR);
BIND_ENUM_CONSTANT(STATUS_ERROR_HOSTNAME_MISMATCH);
}
PacketPeerDTLS::PacketPeerDTLS() {
}
core/io/packet_peer_dtls.h
+68
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@@ -0,0 +1,68 @@
/*************************************************************************/
/* packet_peer_dtls.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 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. */
/*************************************************************************/
#ifndef PACKET_PEER_DTLS_H
#define PACKET_PEER_DTLS_H
#include "core/crypto/crypto.h"
#include "core/io/packet_peer_udp.h"
class PacketPeerDTLS : public PacketPeer {
GDCLASS(PacketPeerDTLS, PacketPeer);
protected:
static PacketPeerDTLS *(*_create)();
static void _bind_methods();
static bool available;
public:
enum Status {
STATUS_DISCONNECTED,
STATUS_HANDSHAKING,
STATUS_CONNECTED,
STATUS_ERROR,
STATUS_ERROR_HOSTNAME_MISMATCH
};
virtual void poll() = 0;
virtual Error connect_to_peer(Ref<PacketPeerUDP> p_base, bool p_validate_certs = true, const String &p_for_hostname = String(), Ref<X509Certificate> p_ca_certs = Ref<X509Certificate>()) = 0;
virtual void disconnect_from_peer() = 0;
virtual Status get_status() const = 0;
static PacketPeerDTLS *create();
static bool is_available();
PacketPeerDTLS();
};
VARIANT_ENUM_CAST(PacketPeerDTLS::Status);
#endif // PACKET_PEER_DTLS_H
core/io/packet_peer_udp.cpp
+73 -2
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@@ -133,7 +133,11 @@ Error PacketPeerUDP::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
}
do {
err = _sock->sendto(p_buffer, p_buffer_size, sent, peer_addr, peer_port);
if (connected) {
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;
@@ -184,12 +188,69 @@ Error PacketPeerUDP::listen(int p_port, const IP_Address &p_bind_address, int p_
return OK;
}
Error PacketPeerUDP::connect_socket(Ref<NetSocket> p_sock) {
Error err;
int read = 0;
uint16_t r_port;
IP_Address r_ip;
err = p_sock->recvfrom(recv_buffer, sizeof(recv_buffer), read, r_ip, r_port, true);
ERR_FAIL_COND_V(err != OK, err);
err = p_sock->connect_to_host(r_ip, r_port);
ERR_FAIL_COND_V(err != OK, err);
_sock = p_sock;
peer_addr = r_ip;
peer_port = r_port;
packet_ip = peer_addr;
packet_port = peer_port;
connected = true;
return OK;
}
Error PacketPeerUDP::connect_to_host(const IP_Address &p_host, int p_port) {
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 (_sock.is_valid())
_sock->close();
rb.resize(16);
queue_count = 0;
connected = false;
}
Error PacketPeerUDP::wait() {
@@ -212,7 +273,13 @@ Error PacketPeerUDP::_poll() {
uint16_t port;
while (true) {
err = _sock->recvfrom(recv_buffer, sizeof(recv_buffer), read, ip, port);
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)
@@ -254,6 +321,7 @@ int PacketPeerUDP::get_packet_port() const {
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;
}
@@ -264,6 +332,8 @@ void PacketPeerUDP::_bind_methods() {
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);
@@ -276,6 +346,7 @@ PacketPeerUDP::PacketPeerUDP() :
packet_port(0),
queue_count(0),
peer_port(0),
connected(false),
blocking(true),
broadcast(false),
_sock(Ref<NetSocket>(NetSocket::create())) {
core/io/packet_peer_udp.h
+6
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@@ -52,6 +52,7 @@ protected:
IP_Address peer_addr;
int peer_port;
bool connected;
bool blocking;
bool broadcast;
Ref<NetSocket> _sock;
@@ -70,6 +71,11 @@ public:
void close();
Error wait();
bool is_listening() const;
Error connect_socket(Ref<NetSocket> p_sock); // Used by UDPServer
Error connect_to_host(const IP_Address &p_host, int p_port);
bool is_connected_to_host() const;
IP_Address get_packet_address() const;
int get_packet_port() const;
void set_dest_address(const IP_Address &p_address, int p_port);
core/io/udp_server.cpp
+119
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@@ -0,0 +1,119 @@
/*************************************************************************/
/* udp_server.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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 "udp_server.h"
void UDPServer::_bind_methods() {
ClassDB::bind_method(D_METHOD("listen", "port", "bind_address"), &UDPServer::listen, DEFVAL("*"));
ClassDB::bind_method(D_METHOD("is_connection_available"), &UDPServer::is_connection_available);
ClassDB::bind_method(D_METHOD("is_listening"), &UDPServer::is_listening);
ClassDB::bind_method(D_METHOD("take_connection"), &UDPServer::take_connection);
ClassDB::bind_method(D_METHOD("stop"), &UDPServer::stop);
}
Error UDPServer::listen(uint16_t p_port, const IP_Address &p_bind_address) {
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);
err = _sock->bind(p_bind_address, p_port);
if (err != OK) {
stop();
return err;
}
bind_address = p_bind_address;
bind_port = p_port;
return OK;
}
bool UDPServer::is_listening() const {
ERR_FAIL_COND_V(!_sock.is_valid(), false);
return _sock->is_open();
}
bool UDPServer::is_connection_available() const {
ERR_FAIL_COND_V(!_sock.is_valid(), false);
if (!_sock->is_open())
return false;
Error err = _sock->poll(NetSocket::POLL_TYPE_IN, 0);
return (err == OK);
}
Ref<PacketPeerUDP> UDPServer::take_connection() {
Ref<PacketPeerUDP> conn;
if (!is_connection_available()) {
return conn;
}
conn = Ref<PacketPeerUDP>(memnew(PacketPeerUDP));
conn->connect_socket(_sock);
_sock = Ref<NetSocket>(NetSocket::create());
listen(bind_port, bind_address);
return conn;
}
void UDPServer::stop() {
if (_sock.is_valid()) {
_sock->close();
}
bind_port = 0;
bind_address = IP_Address();
}
UDPServer::UDPServer() :
_sock(Ref<NetSocket>(NetSocket::create())) {
}
UDPServer::~UDPServer() {
stop();
}
core/io/udp_server.h
+58
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@@ -0,0 +1,58 @@
/*************************************************************************/
/* udp_server.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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. */
/*************************************************************************/
#ifndef UDP_SERVER_H
#define UDP_SERVER_H
#include "core/io/net_socket.h"
#include "core/io/packet_peer_udp.h"
class UDPServer : public Reference {
GDCLASS(UDPServer, Reference);
protected:
static void _bind_methods();
int bind_port;
IP_Address bind_address;
Ref<NetSocket> _sock;
public:
Error listen(uint16_t p_port, const IP_Address &p_bind_address = IP_Address("*"));
bool is_listening() const;
bool is_connection_available() const;
Ref<PacketPeerUDP> take_connection();
void stop();
UDPServer();
~UDPServer();
};
#endif // UDP_SERVER_H