godot/core/io/tcp_server.cpp

/*************************************************************************/
/*  tcp_server.cpp                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "tcp_server.h"

void TCP_Server::_bind_methods() {
	ClassDB::bind_method(D_METHOD("listen", "port", "bind_address"), &TCP_Server::listen, DEFVAL("*"));
	ClassDB::bind_method(D_METHOD("is_connection_available"), &TCP_Server::is_connection_available);
	ClassDB::bind_method(D_METHOD("is_listening"), &TCP_Server::is_listening);
	ClassDB::bind_method(D_METHOD("get_local_port"), &TCP_Server::get_local_port);
	ClassDB::bind_method(D_METHOD("take_connection"), &TCP_Server::take_connection);
	ClassDB::bind_method(D_METHOD("stop"), &TCP_Server::stop);
}

Error TCP_Server::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);
	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).");

	Error err;
	IP::Type ip_type = IP::TYPE_ANY;

	// If the bind address is valid use its type as the socket type
	if (p_bind_address.is_valid()) {
		ip_type = p_bind_address.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
	}

	err = _sock->open(NetSocket::TYPE_TCP, ip_type);

	ERR_FAIL_COND_V(err != OK, 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) {
		_sock->close();
		return ERR_ALREADY_IN_USE;
	}

	err = _sock->listen(MAX_PENDING_CONNECTIONS);

	if (err != OK) {
		_sock->close();
		return FAILED;
	}
	return OK;
}

int TCP_Server::get_local_port() const {
	uint16_t local_port;
	_sock->get_socket_address(nullptr, &local_port);
	return local_port;
}

bool TCP_Server::is_listening() const {
	ERR_FAIL_COND_V(!_sock.is_valid(), false);

	return _sock->is_open();
}

bool TCP_Server::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<StreamPeerTCP> TCP_Server::take_connection() {
	Ref<StreamPeerTCP> conn;
	if (!is_connection_available()) {
		return conn;
	}

	Ref<NetSocket> ns;
	IP_Address ip;
	uint16_t port = 0;
	ns = _sock->accept(ip, port);
	if (!ns.is_valid()) {
		return conn;
	}

	conn = Ref<StreamPeerTCP>(memnew(StreamPeerTCP));
	conn->accept_socket(ns, ip, port);
	return conn;
}

void TCP_Server::stop() {
	if (_sock.is_valid()) {
		_sock->close();
	}
}

TCP_Server::TCP_Server() :
		_sock(Ref<NetSocket>(NetSocket::create())) {
}

TCP_Server::~TCP_Server() {
	stop();
}