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316 lines
8.1 KiB
C++
316 lines
8.1 KiB
C++
/*************************************************************************/
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/* packet_peer_udp_posix.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) 2007-2019 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
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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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#include "packet_peer_udp_posix.h"
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#ifdef UNIX_ENABLED
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#include <errno.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#ifndef NO_FCNTL
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#ifdef __HAIKU__
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#include <fcntl.h>
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#else
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#include <sys/fcntl.h>
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#endif
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#else
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#include <sys/ioctl.h>
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#endif
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#ifdef JAVASCRIPT_ENABLED
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#include <arpa/inet.h>
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#endif
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#include "drivers/unix/socket_helpers.h"
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int PacketPeerUDPPosix::get_available_packet_count() const {
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Error err = const_cast<PacketPeerUDPPosix *>(this)->_poll(false);
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if (err != OK)
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return 0;
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return queue_count;
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}
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Error PacketPeerUDPPosix::get_packet(const uint8_t **r_buffer, int &r_buffer_size) const {
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Error err = const_cast<PacketPeerUDPPosix *>(this)->_poll(false);
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if (err != OK)
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return err;
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if (queue_count == 0)
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return ERR_UNAVAILABLE;
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uint32_t size;
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uint8_t type;
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rb.read(&type, 1, true);
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if (type == IP::TYPE_IPV4) {
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uint8_t ip[4];
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rb.read(ip, 4, true);
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packet_ip.set_ipv4(ip);
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} else {
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uint8_t ipv6[16];
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rb.read(ipv6, 16, true);
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packet_ip.set_ipv6(ipv6);
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};
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rb.read((uint8_t *)&packet_port, 4, true);
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rb.read((uint8_t *)&size, 4, true);
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rb.read(packet_buffer, size, true);
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--queue_count;
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*r_buffer = packet_buffer;
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r_buffer_size = size;
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return OK;
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}
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Error PacketPeerUDPPosix::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
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ERR_FAIL_COND_V(!peer_addr.is_valid(), ERR_UNCONFIGURED);
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if (sock_type == IP::TYPE_NONE)
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sock_type = peer_addr.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
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int sock = _get_socket();
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ERR_FAIL_COND_V(sock == -1, FAILED);
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struct sockaddr_storage addr;
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size_t addr_size = _set_sockaddr(&addr, peer_addr, peer_port, sock_type);
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errno = 0;
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int err;
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_set_sock_blocking(blocking);
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while ((err = sendto(sock, p_buffer, p_buffer_size, 0, (struct sockaddr *)&addr, addr_size)) != p_buffer_size) {
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if (errno != EAGAIN) {
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return FAILED;
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} else if (!blocking) {
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return ERR_UNAVAILABLE;
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}
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}
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return OK;
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}
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int PacketPeerUDPPosix::get_max_packet_size() const {
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return 512; // uhm maybe not
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}
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Error PacketPeerUDPPosix::listen(int p_port, IP_Address p_bind_address, int p_recv_buffer_size) {
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ERR_FAIL_COND_V(sockfd != -1, ERR_ALREADY_IN_USE);
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ERR_FAIL_COND_V(!p_bind_address.is_valid() && !p_bind_address.is_wildcard(), ERR_INVALID_PARAMETER);
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#ifdef __OpenBSD__
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sock_type = IP::TYPE_IPV4; // OpenBSD does not support dual stacking, fallback to IPv4 only.
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#else
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sock_type = IP::TYPE_ANY;
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#endif
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if (p_bind_address.is_valid())
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sock_type = p_bind_address.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
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int sock = _get_socket();
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if (sock == -1)
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return ERR_CANT_CREATE;
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sockaddr_storage addr = { 0 };
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size_t addr_size = _set_listen_sockaddr(&addr, p_port, sock_type, IP_Address());
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if (bind(sock, (struct sockaddr *)&addr, addr_size) == -1) {
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close();
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return ERR_UNAVAILABLE;
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}
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rb.resize(nearest_shift(p_recv_buffer_size));
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return OK;
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}
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void PacketPeerUDPPosix::close() {
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if (sockfd != -1)
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::close(sockfd);
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sockfd = -1;
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sock_type = IP::TYPE_NONE;
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rb.resize(16);
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queue_count = 0;
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}
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Error PacketPeerUDPPosix::wait() {
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return _poll(true);
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}
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Error PacketPeerUDPPosix::_poll(bool p_wait) {
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if (sockfd == -1) {
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return FAILED;
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}
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_set_sock_blocking(p_wait);
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struct sockaddr_storage from = { 0 };
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socklen_t len = sizeof(struct sockaddr_storage);
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int ret;
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while ((ret = recvfrom(sockfd, recv_buffer, MIN((int)sizeof(recv_buffer), MAX(rb.space_left() - 24, 0)), 0, (struct sockaddr *)&from, &len)) > 0) {
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uint32_t port = 0;
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if (from.ss_family == AF_INET) {
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uint8_t type = (uint8_t)IP::TYPE_IPV4;
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rb.write(&type, 1);
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struct sockaddr_in *sin_from = (struct sockaddr_in *)&from;
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rb.write((uint8_t *)&sin_from->sin_addr, 4);
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port = ntohs(sin_from->sin_port);
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} else if (from.ss_family == AF_INET6) {
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uint8_t type = (uint8_t)IP::TYPE_IPV6;
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rb.write(&type, 1);
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struct sockaddr_in6 *s6_from = (struct sockaddr_in6 *)&from;
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rb.write((uint8_t *)&s6_from->sin6_addr, 16);
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port = ntohs(s6_from->sin6_port);
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} else {
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// WARN_PRINT("Ignoring packet with unknown address family");
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uint8_t type = (uint8_t)IP::TYPE_NONE;
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rb.write(&type, 1);
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};
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rb.write((uint8_t *)&port, 4);
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rb.write((uint8_t *)&ret, 4);
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rb.write(recv_buffer, ret);
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len = sizeof(struct sockaddr_storage);
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++queue_count;
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if (p_wait)
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break;
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};
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// TODO: Should ECONNRESET be handled here?
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if (ret == 0 || (ret == -1 && errno != EAGAIN)) {
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close();
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return FAILED;
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};
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return OK;
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}
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bool PacketPeerUDPPosix::is_listening() const {
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return sockfd != -1;
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}
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IP_Address PacketPeerUDPPosix::get_packet_address() const {
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return packet_ip;
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}
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int PacketPeerUDPPosix::get_packet_port() const {
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return packet_port;
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}
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int PacketPeerUDPPosix::_get_socket() {
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ERR_FAIL_COND_V(sock_type == IP::TYPE_NONE, -1);
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if (sockfd != -1)
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return sockfd;
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sockfd = _socket_create(sock_type, SOCK_DGRAM, IPPROTO_UDP);
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if (sockfd != -1)
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_set_sock_blocking(false);
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return sockfd;
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}
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void PacketPeerUDPPosix::_set_sock_blocking(bool p_blocking) {
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if (sock_blocking == p_blocking)
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return;
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sock_blocking = p_blocking;
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#ifndef NO_FCNTL
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int opts = fcntl(sockfd, F_GETFL);
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int ret = 0;
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if (sock_blocking)
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ret = fcntl(sockfd, F_SETFL, opts & ~O_NONBLOCK);
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else
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ret = fcntl(sockfd, F_SETFL, opts | O_NONBLOCK);
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if (ret == -1)
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perror("setting non-block mode");
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#else
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int bval = sock_blocking ? 0 : 1;
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if (ioctl(sockfd, FIONBIO, &bval) == -1)
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perror("setting non-block mode");
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#endif
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}
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void PacketPeerUDPPosix::set_send_address(const IP_Address &p_address, int p_port) {
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peer_addr = p_address;
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peer_port = p_port;
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}
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PacketPeerUDP *PacketPeerUDPPosix::_create() {
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return memnew(PacketPeerUDPPosix);
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};
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void PacketPeerUDPPosix::make_default() {
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PacketPeerUDP::_create = PacketPeerUDPPosix::_create;
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};
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PacketPeerUDPPosix::PacketPeerUDPPosix() {
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blocking = true;
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sock_blocking = true;
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sockfd = -1;
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packet_port = 0;
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queue_count = 0;
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peer_port = 0;
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sock_type = IP::TYPE_NONE;
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rb.resize(16);
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}
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PacketPeerUDPPosix::~PacketPeerUDPPosix() {
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close();
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}
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#endif
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