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godot/drivers/unix/packet_peer_udp_posix.cpp

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/*************************************************************************/
/* packet_peer_udp_posix.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 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_posix.h"
#ifdef UNIX_ENABLED
#include <errno.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <netinet/in.h>
#include <stdio.h>
#ifndef NO_FCNTL
#ifdef __HAIKU__
#include <fcntl.h>
#else
#include <sys/fcntl.h>
#endif
#else
#include <sys/ioctl.h>
#endif
#ifdef JAVASCRIPT_ENABLED
#include <arpa/inet.h>
#endif
#include "drivers/unix/socket_helpers.h"
int PacketPeerUDPPosix::get_available_packet_count() const {
Error err = const_cast<PacketPeerUDPPosix *>(this)->_poll(false);
if (err != OK)
return 0;
return queue_count;
}
Error PacketPeerUDPPosix::get_packet(const uint8_t **r_buffer, int &r_buffer_size) const {
Error err = const_cast<PacketPeerUDPPosix *>(this)->_poll(false);
if (err != OK)
return err;
if (queue_count == 0)
return ERR_UNAVAILABLE;
uint32_t size;
uint8_t type;
rb.read(&type, 1, true);
if (type == IP::TYPE_IPV4) {
uint8_t ip[4];
rb.read(ip, 4, true);
packet_ip.set_ipv4(ip);
} else {
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 PacketPeerUDPPosix::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V(!peer_addr.is_valid(), ERR_UNCONFIGURED);
if (sock_type == IP::TYPE_NONE)
sock_type = peer_addr.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
int sock = _get_socket();
ERR_FAIL_COND_V(sock == -1, FAILED);
struct sockaddr_storage addr;
size_t addr_size = _set_sockaddr(&addr, peer_addr, peer_port, sock_type);
errno = 0;
int err;
_set_sock_blocking(blocking);
while ((err = sendto(sock, p_buffer, p_buffer_size, 0, (struct sockaddr *)&addr, addr_size)) != p_buffer_size) {
if (errno != EAGAIN) {
return FAILED;
} else if (!blocking) {
return ERR_UNAVAILABLE;
}
}
return OK;
}
int PacketPeerUDPPosix::get_max_packet_size() const {
return 512; // uhm maybe not
}
Error PacketPeerUDPPosix::listen(int p_port, const IP_Address &p_bind_address, int p_recv_buffer_size) {
ERR_FAIL_COND_V(sockfd != -1, ERR_ALREADY_IN_USE);
ERR_FAIL_COND_V(!p_bind_address.is_valid() && !p_bind_address.is_wildcard(), ERR_INVALID_PARAMETER);
#ifdef __OpenBSD__
sock_type = IP::TYPE_IPV4; // OpenBSD does not support dual stacking, fallback to IPv4 only.
#else
sock_type = IP::TYPE_ANY;
#endif
if (p_bind_address.is_valid())
sock_type = p_bind_address.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
int sock = _get_socket();
if (sock == -1)
return ERR_CANT_CREATE;
sockaddr_storage addr = { 0 };
size_t addr_size = _set_listen_sockaddr(&addr, p_port, sock_type, IP_Address());
if (bind(sock, (struct sockaddr *)&addr, addr_size) == -1) {
close();
return ERR_UNAVAILABLE;
}
rb.resize(nearest_shift(p_recv_buffer_size));
return OK;
}
void PacketPeerUDPPosix::close() {
if (sockfd != -1)
::close(sockfd);
sockfd = -1;
sock_type = IP::TYPE_NONE;
rb.resize(16);
queue_count = 0;
}
Error PacketPeerUDPPosix::wait() {
return _poll(true);
}
Error PacketPeerUDPPosix::_poll(bool p_block) {
if (sockfd == -1) {
return FAILED;
}
_set_sock_blocking(p_block);
struct sockaddr_storage from = { 0 };
socklen_t len = sizeof(struct sockaddr_storage);
int ret;
while ((ret = recvfrom(sockfd, recv_buffer, MIN((int)sizeof(recv_buffer), MAX(rb.space_left() - 24, 0)), 0, (struct sockaddr *)&from, &len)) > 0) {
uint32_t port = 0;
if (from.ss_family == AF_INET) {
uint8_t type = (uint8_t)IP::TYPE_IPV4;
rb.write(&type, 1);
struct sockaddr_in *sin_from = (struct sockaddr_in *)&from;
rb.write((uint8_t *)&sin_from->sin_addr, 4);
port = ntohs(sin_from->sin_port);
} else if (from.ss_family == AF_INET6) {
uint8_t type = (uint8_t)IP::TYPE_IPV6;
rb.write(&type, 1);
struct sockaddr_in6 *s6_from = (struct sockaddr_in6 *)&from;
rb.write((uint8_t *)&s6_from->sin6_addr, 16);
port = ntohs(s6_from->sin6_port);
} else {
// WARN_PRINT("Ignoring packet with unknown address family");
uint8_t type = (uint8_t)IP::TYPE_NONE;
rb.write(&type, 1);
};
rb.write((uint8_t *)&port, 4);
rb.write((uint8_t *)&ret, 4);
rb.write(recv_buffer, ret);
len = sizeof(struct sockaddr_storage);
++queue_count;
if (p_block)
break;
};
// TODO: Should ECONNRESET be handled here?
if (ret == 0 || (ret == -1 && errno != EAGAIN)) {
close();
return FAILED;
};
return OK;
}
bool PacketPeerUDPPosix::is_listening() const {
return sockfd != -1;
}
IP_Address PacketPeerUDPPosix::get_packet_address() const {
return packet_ip;
}
int PacketPeerUDPPosix::get_packet_port() const {
return packet_port;
}
int PacketPeerUDPPosix::_get_socket() {
ERR_FAIL_COND_V(sock_type == IP::TYPE_NONE, -1);
if (sockfd != -1)
return sockfd;
sockfd = _socket_create(sock_type, SOCK_DGRAM, IPPROTO_UDP);
if (sockfd != -1)
_set_sock_blocking(false);
return sockfd;
}
void PacketPeerUDPPosix::_set_sock_blocking(bool p_blocking) {
if (sock_blocking == p_blocking)
return;
sock_blocking = p_blocking;
#ifndef NO_FCNTL
int opts = fcntl(sockfd, F_GETFL);
int ret = 0;
if (sock_blocking)
ret = fcntl(sockfd, F_SETFL, opts & ~O_NONBLOCK);
else
ret = fcntl(sockfd, F_SETFL, opts | O_NONBLOCK);
if (ret == -1)
perror("setting non-block mode");
#else
int bval = sock_blocking ? 0 : 1;
if (ioctl(sockfd, FIONBIO, &bval) == -1)
perror("setting non-block mode");
#endif
}
void PacketPeerUDPPosix::set_dest_address(const IP_Address &p_address, int p_port) {
peer_addr = p_address;
peer_port = p_port;
}
PacketPeerUDP *PacketPeerUDPPosix::_create() {
return memnew(PacketPeerUDPPosix);
};
void PacketPeerUDPPosix::make_default() {
PacketPeerUDP::_create = PacketPeerUDPPosix::_create;
};
PacketPeerUDPPosix::PacketPeerUDPPosix() {
blocking = true;
sock_blocking = true;
sockfd = -1;
packet_port = 0;
queue_count = 0;
peer_port = 0;
sock_type = IP::TYPE_NONE;
rb.resize(16);
}
PacketPeerUDPPosix::~PacketPeerUDPPosix() {
close();
}
#endif
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