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godot/drivers/unix/net_socket_posix.cpp

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/*************************************************************************/
/* net_socket_posix.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 "net_socket_posix.h"
#if defined(UNIX_ENABLED)
#include <errno.h>
#include <netdb.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
#ifndef NO_FCNTL
#ifdef __HAIKU__
#include <fcntl.h>
#else
#include <sys/fcntl.h>
#endif
#else
#include <sys/ioctl.h>
#endif
#include <netinet/in.h>
#include <sys/socket.h>
#ifdef JAVASCRIPT_ENABLED
#include <arpa/inet.h>
#endif
#include <netinet/tcp.h>
#if defined(OSX_ENABLED) || defined(IPHONE_ENABLED)
#define MSG_NOSIGNAL SO_NOSIGPIPE
#endif
// Some custom defines to minimize ifdefs
#define SOCK_EMPTY -1
#define SOCK_BUF(x) x
#define SOCK_CBUF(x) x
#define SOCK_IOCTL ioctl
#define SOCK_CLOSE ::close
/* Windows */
#elif defined(WINDOWS_ENABLED)
#include <winsock2.h>
#include <ws2tcpip.h>
#include <mswsock.h>
// Some custom defines to minimize ifdefs
#define SOCK_EMPTY INVALID_SOCKET
#define SOCK_BUF(x) (char *)(x)
#define SOCK_CBUF(x) (const char *)(x)
#define SOCK_IOCTL ioctlsocket
#define SOCK_CLOSE closesocket
// Windows doesn't have this flag
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
// Workaround missing flag in MinGW
#if defined(__MINGW32__) && !defined(SIO_UDP_NETRESET)
#define SIO_UDP_NETRESET _WSAIOW(IOC_VENDOR, 15)
#endif
#endif
static size_t _set_addr_storage(struct sockaddr_storage *p_addr, const IP_Address &p_ip, uint16_t p_port, IP::Type p_ip_type) {
memset(p_addr, 0, sizeof(struct sockaddr_storage));
if (p_ip_type == IP::TYPE_IPV6 || p_ip_type == IP::TYPE_ANY) { // IPv6 socket
// IPv6 only socket with IPv4 address
ERR_FAIL_COND_V(!p_ip.is_wildcard() && p_ip_type == IP::TYPE_IPV6 && p_ip.is_ipv4(), 0);
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)p_addr;
addr6->sin6_family = AF_INET6;
addr6->sin6_port = htons(p_port);
if (p_ip.is_valid()) {
copymem(&addr6->sin6_addr.s6_addr, p_ip.get_ipv6(), 16);
} else {
addr6->sin6_addr = in6addr_any;
}
return sizeof(sockaddr_in6);
} else { // IPv4 socket
// IPv4 socket with IPv6 address
ERR_FAIL_COND_V(!p_ip.is_ipv4(), 0);
struct sockaddr_in *addr4 = (struct sockaddr_in *)p_addr;
addr4->sin_family = AF_INET;
addr4->sin_port = htons(p_port); // short, network byte order
if (p_ip.is_valid()) {
copymem(&addr4->sin_addr.s_addr, p_ip.get_ipv4(), 4);
} else {
addr4->sin_addr.s_addr = INADDR_ANY;
}
copymem(&addr4->sin_addr.s_addr, p_ip.get_ipv4(), 16);
return sizeof(sockaddr_in);
}
}
static void _set_ip_port(IP_Address &r_ip, uint16_t &r_port, struct sockaddr_storage *p_addr) {
if (p_addr->ss_family == AF_INET) {
struct sockaddr_in *addr4 = (struct sockaddr_in *)p_addr;
r_ip.set_ipv4((uint8_t *)&(addr4->sin_addr.s_addr));
r_port = ntohs(addr4->sin_port);
} else if (p_addr->ss_family == AF_INET6) {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)p_addr;
r_ip.set_ipv6(addr6->sin6_addr.s6_addr);
r_port = ntohs(addr6->sin6_port);
};
}
NetSocket *NetSocketPosix::_create_func() {
return memnew(NetSocketPosix);
}
void NetSocketPosix::make_default() {
#if defined(WINDOWS_ENABLED)
if (_create == NULL) {
WSADATA data;
WSAStartup(MAKEWORD(2, 2), &data);
}
#endif
_create = _create_func;
}
void NetSocketPosix::cleanup() {
#if defined(WINDOWS_ENABLED)
if (_create != NULL) {
WSACleanup();
}
_create = NULL;
#endif
}
NetSocketPosix::NetSocketPosix() {
_sock = SOCK_EMPTY;
_ip_type = IP::TYPE_NONE;
_is_stream = false;
}
NetSocketPosix::~NetSocketPosix() {
close();
}
NetSocketPosix::NetError NetSocketPosix::_get_socket_error() {
#if defined(WINDOWS_ENABLED)
int err = WSAGetLastError();
if (err == WSAEISCONN)
return ERR_NET_IS_CONNECTED;
if (err == WSAEINPROGRESS || err == WSAEALREADY)
return ERR_NET_IN_PROGRESS;
if (err == WSAEWOULDBLOCK)
return ERR_NET_WOULD_BLOCK;
ERR_PRINTS("Socket error: " + itos(err));
return ERR_NET_OTHER;
#else
if (errno == EISCONN)
return ERR_NET_IS_CONNECTED;
if (errno == EINPROGRESS || errno == EALREADY)
return ERR_NET_IN_PROGRESS;
if (errno == EAGAIN || errno == EWOULDBLOCK)
return ERR_NET_WOULD_BLOCK;
ERR_PRINTS("Socket error: " + itos(errno));
return ERR_NET_OTHER;
#endif
}
bool NetSocketPosix::_can_use_ip(const IP_Address p_ip, const bool p_for_bind) const {
if (p_for_bind && !(p_ip.is_valid() || p_ip.is_wildcard())) {
return false;
} else if (!p_for_bind && !p_ip.is_valid()) {
return false;
}
// Check if socket support this IP type.
IP::Type type = p_ip.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;
if (_ip_type != IP::TYPE_ANY && !p_ip.is_wildcard() && _ip_type != type) {
return false;
}
return true;
}
void NetSocketPosix::_set_socket(SOCKET_TYPE p_sock, IP::Type p_ip_type, bool p_is_stream) {
_sock = p_sock;
_ip_type = p_ip_type;
_is_stream = p_is_stream;
}
Error NetSocketPosix::open(Type p_sock_type, IP::Type &ip_type) {
ERR_FAIL_COND_V(is_open(), ERR_ALREADY_IN_USE);
ERR_FAIL_COND_V(ip_type > IP::TYPE_ANY || ip_type < IP::TYPE_NONE, ERR_INVALID_PARAMETER);
#if defined(__OpenBSD__)
// OpenBSD does not support dual stacking, fallback to IPv4 only.
if (ip_type == IP::TYPE_ANY)
ip_type = IP::TYPE_IPV4;
#endif
int family = ip_type == IP::TYPE_IPV4 ? AF_INET : AF_INET6;
int protocol = p_sock_type == TYPE_TCP ? IPPROTO_TCP : IPPROTO_UDP;
int type = p_sock_type == TYPE_TCP ? SOCK_STREAM : SOCK_DGRAM;
_sock = socket(family, type, protocol);
if (_sock == SOCK_EMPTY && ip_type == IP::TYPE_ANY) {
// Careful here, changing the referenced parameter so the caller knows that we are using an IPv4 socket
// in place of a dual stack one, and further calls to _set_sock_addr will work as expected.
ip_type = IP::TYPE_IPV4;
family = AF_INET;
_sock = socket(family, type, protocol);
}
ERR_FAIL_COND_V(_sock == SOCK_EMPTY, FAILED);
_ip_type = ip_type;
if (family == AF_INET6) {
// Select IPv4 over IPv6 mapping
set_ipv6_only_enabled(ip_type != IP::TYPE_ANY);
}
if (protocol == IPPROTO_UDP && ip_type != IP::TYPE_IPV6) {
// Enable broadcasting for UDP sockets if it's not IPv6 only (IPv6 has no broadcast option).
set_broadcasting_enabled(true);
}
_is_stream = p_sock_type == TYPE_TCP;
#if defined(WINDOWS_ENABLED)
if (!_is_stream) {
// Disable windows feature/bug reporting WSAECONNRESET/WSAENETRESET when
// recv/recvfrom and an ICMP reply was received from a previous send/sendto.
unsigned long disable = 0;
if (ioctlsocket(_sock, SIO_UDP_CONNRESET, &disable) == SOCKET_ERROR) {
print_verbose("Unable to turn off UDP WSAECONNRESET behaviour on Windows");
}
if (ioctlsocket(_sock, SIO_UDP_NETRESET, &disable) == SOCKET_ERROR) {
// This feature seems not to be supported on wine.
print_verbose("Unable to turn off UDP WSAENETRESET behaviour on Windows");
}
}
#endif
return OK;
}
void NetSocketPosix::close() {
if (_sock != SOCK_EMPTY)
SOCK_CLOSE(_sock);
_sock = SOCK_EMPTY;
_ip_type = IP::TYPE_NONE;
_is_stream = false;
}
Error NetSocketPosix::bind(IP_Address p_addr, uint16_t p_port) {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
ERR_FAIL_COND_V(!_can_use_ip(p_addr, true), ERR_INVALID_PARAMETER);
sockaddr_storage addr;
size_t addr_size = _set_addr_storage(&addr, p_addr, p_port, _ip_type);
if (::bind(_sock, (struct sockaddr *)&addr, addr_size) == SOCK_EMPTY) {
close();
ERR_FAIL_V(ERR_UNAVAILABLE);
}
return OK;
}
Error NetSocketPosix::listen(int p_max_pending) {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
if (::listen(_sock, p_max_pending) == SOCK_EMPTY) {
close();
ERR_FAIL_V(FAILED);
};
return OK;
}
Error NetSocketPosix::connect_to_host(IP_Address p_host, uint16_t p_port) {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
ERR_FAIL_COND_V(!_can_use_ip(p_host, false), ERR_INVALID_PARAMETER);
struct sockaddr_storage addr;
size_t addr_size = _set_addr_storage(&addr, p_host, p_port, _ip_type);
if (::connect(_sock, (struct sockaddr *)&addr, addr_size) == SOCK_EMPTY) {
NetError err = _get_socket_error();
switch (err) {
// We are already connected
case ERR_NET_IS_CONNECTED:
return OK;
// Still waiting to connect, try again in a while
case ERR_NET_WOULD_BLOCK:
case ERR_NET_IN_PROGRESS:
return ERR_BUSY;
default:
ERR_PRINT("Connection to remote host failed!");
close();
return FAILED;
}
}
return OK;
}
Error NetSocketPosix::poll(PollType p_type, int p_timeout) const {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
#if defined(WINDOWS_ENABLED)
bool ready = false;
fd_set rd, wr, ex;
fd_set *rdp = NULL;
fd_set *wrp = NULL;
FD_ZERO(&rd);
FD_ZERO(&wr);
FD_ZERO(&ex);
FD_SET(_sock, &ex);
struct timeval timeout = { p_timeout, 0 };
// For blocking operation, pass NULL timeout pointer to select.
struct timeval *tp = NULL;
if (p_timeout >= 0) {
// If timeout is non-negative, we want to specify the timeout instead.
tp = &timeout;
}
switch (p_type) {
case POLL_TYPE_IN:
FD_SET(_sock, &rd);
rdp = &rd;
break;
case POLL_TYPE_OUT:
FD_SET(_sock, &wr);
wrp = &wr;
break;
case POLL_TYPE_IN_OUT:
FD_SET(_sock, &rd);
FD_SET(_sock, &wr);
rdp = &rd;
wrp = &wr;
}
int ret = select(1, rdp, wrp, &ex, tp);
ERR_FAIL_COND_V(ret == SOCKET_ERROR, FAILED);
if (ret == 0)
return ERR_BUSY;
ERR_FAIL_COND_V(FD_ISSET(_sock, &ex), FAILED);
if (rdp && FD_ISSET(_sock, rdp))
ready = true;
if (wrp && FD_ISSET(_sock, wrp))
ready = true;
return ready ? OK : ERR_BUSY;
#else
struct pollfd pfd;
pfd.fd = _sock;
pfd.events = POLLIN;
pfd.revents = 0;
switch (p_type) {
case POLL_TYPE_IN:
pfd.events = POLLIN;
break;
case POLL_TYPE_OUT:
pfd.events = POLLOUT;
break;
case POLL_TYPE_IN_OUT:
pfd.events = POLLOUT || POLLIN;
}
int ret = ::poll(&pfd, 1, p_timeout);
ERR_FAIL_COND_V(ret < 0, FAILED);
ERR_FAIL_COND_V(pfd.revents & POLLERR, FAILED);
if (ret == 0)
return ERR_BUSY;
return OK;
#endif
}
Error NetSocketPosix::recv(uint8_t *p_buffer, int p_len, int &r_read) {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
r_read = ::recv(_sock, SOCK_BUF(p_buffer), p_len, 0);
if (r_read < 0) {
NetError err = _get_socket_error();
if (err == ERR_NET_WOULD_BLOCK)
return ERR_BUSY;
return FAILED;
}
return OK;
}
Error NetSocketPosix::recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IP_Address &r_ip, uint16_t &r_port) {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
struct sockaddr_storage from;
socklen_t len = sizeof(struct sockaddr_storage);
memset(&from, 0, len);
r_read = ::recvfrom(_sock, SOCK_BUF(p_buffer), p_len, 0, (struct sockaddr *)&from, &len);
if (r_read < 0) {
NetError err = _get_socket_error();
if (err == ERR_NET_WOULD_BLOCK)
return ERR_BUSY;
return FAILED;
}
if (from.ss_family == AF_INET) {
struct sockaddr_in *sin_from = (struct sockaddr_in *)&from;
r_ip.set_ipv4((uint8_t *)&sin_from->sin_addr);
r_port = ntohs(sin_from->sin_port);
} else if (from.ss_family == AF_INET6) {
struct sockaddr_in6 *s6_from = (struct sockaddr_in6 *)&from;
r_ip.set_ipv6((uint8_t *)&s6_from->sin6_addr);
r_port = ntohs(s6_from->sin6_port);
} else {
// Unsupported socket family, should never happen.
ERR_FAIL_V(FAILED);
}
return OK;
}
Error NetSocketPosix::send(const uint8_t *p_buffer, int p_len, int &r_sent) {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
int flags = 0;
if (_is_stream)
flags = MSG_NOSIGNAL;
r_sent = ::send(_sock, SOCK_CBUF(p_buffer), p_len, flags);
if (r_sent < 0) {
NetError err = _get_socket_error();
if (err == ERR_NET_WOULD_BLOCK)
return ERR_BUSY;
return FAILED;
}
return OK;
}
Error NetSocketPosix::sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IP_Address p_ip, uint16_t p_port) {
ERR_FAIL_COND_V(!is_open(), ERR_UNCONFIGURED);
struct sockaddr_storage addr;
size_t addr_size = _set_addr_storage(&addr, p_ip, p_port, _ip_type);
r_sent = ::sendto(_sock, SOCK_CBUF(p_buffer), p_len, 0, (struct sockaddr *)&addr, addr_size);
if (r_sent < 0) {
NetError err = _get_socket_error();
if (err == ERR_NET_WOULD_BLOCK)
return ERR_BUSY;
return FAILED;
}
return OK;
}
void NetSocketPosix::set_broadcasting_enabled(bool p_enabled) {
ERR_FAIL_COND(!is_open());
// IPv6 has no broadcast support.
ERR_FAIL_COND(_ip_type == IP::TYPE_IPV6);
int par = p_enabled ? 1 : 0;
if (setsockopt(_sock, SOL_SOCKET, SO_BROADCAST, SOCK_CBUF(&par), sizeof(int)) != 0) {
WARN_PRINT("Unable to change broadcast setting");
}
}
void NetSocketPosix::set_blocking_enabled(bool p_enabled) {
ERR_FAIL_COND(!is_open());
int ret = 0;
#if defined(WINDOWS_ENABLED) || defined(NO_FCNTL)
unsigned long par = p_enabled ? 0 : 1;
ret = SOCK_IOCTL(_sock, FIONBIO, &par);
#else
int opts = fcntl(_sock, F_GETFL);
if (p_enabled)
ret = fcntl(_sock, F_SETFL, opts & ~O_NONBLOCK);
else
ret = fcntl(_sock, F_SETFL, opts | O_NONBLOCK);
#endif
if (ret != 0)
WARN_PRINT("Unable to change non-block mode");
}
void NetSocketPosix::set_ipv6_only_enabled(bool p_enabled) {
ERR_FAIL_COND(!is_open());
// This option is only avaiable in IPv6 sockets.
ERR_FAIL_COND(_ip_type == IP::TYPE_IPV4);
int par = p_enabled ? 1 : 0;
if (setsockopt(_sock, IPPROTO_IPV6, IPV6_V6ONLY, SOCK_CBUF(&par), sizeof(int)) != 0) {
WARN_PRINT("Unable to change IPv4 address mapping over IPv6 option");
}
}
void NetSocketPosix::set_tcp_no_delay_enabled(bool p_enabled) {
ERR_FAIL_COND(!is_open());
ERR_FAIL_COND(_ip_type != TYPE_TCP);
int par = p_enabled ? 1 : 0;
if (setsockopt(_sock, IPPROTO_TCP, TCP_NODELAY, SOCK_CBUF(&par), sizeof(int)) < 0) {
ERR_PRINT("Unable to set TCP no delay option");
}
}
void NetSocketPosix::set_reuse_address_enabled(bool p_enabled) {
ERR_FAIL_COND(!is_open());
int par = p_enabled ? 1 : 0;
if (setsockopt(_sock, SOL_SOCKET, SO_REUSEADDR, SOCK_CBUF(&par), sizeof(int)) < 0) {
WARN_PRINT("Unable to set socket REUSEADDR option!");
}
}
void NetSocketPosix::set_reuse_port_enabled(bool p_enabled) {
// Windows does not have this option, as it is always ON when setting REUSEADDR.
#ifndef WINDOWS_ENABLED
ERR_FAIL_COND(!is_open());
int par = p_enabled ? 1 : 0;
if (setsockopt(_sock, SOL_SOCKET, SO_REUSEPORT, SOCK_CBUF(&par), sizeof(int)) < 0) {
WARN_PRINT("Unable to set socket REUSEPORT option!");
}
#endif
}
bool NetSocketPosix::is_open() const {
return _sock != SOCK_EMPTY;
}
int NetSocketPosix::get_available_bytes() const {
ERR_FAIL_COND_V(_sock == SOCK_EMPTY, -1);
unsigned long len;
int ret = SOCK_IOCTL(_sock, FIONREAD, &len);
ERR_FAIL_COND_V(ret == -1, 0);
return len;
}
Ref<NetSocket> NetSocketPosix::accept(IP_Address &r_ip, uint16_t &r_port) {
Ref<NetSocket> out;
ERR_FAIL_COND_V(!is_open(), out);
struct sockaddr_storage their_addr;
socklen_t size = sizeof(their_addr);
SOCKET_TYPE fd = ::accept(_sock, (struct sockaddr *)&their_addr, &size);
ERR_FAIL_COND_V(fd == SOCK_EMPTY, out);
_set_ip_port(r_ip, r_port, &their_addr);
NetSocketPosix *ns = memnew(NetSocketPosix);
ns->_set_socket(fd, _ip_type, _is_stream);
ns->set_blocking_enabled(false);
return Ref<NetSocket>(ns);
}
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