blob: bc3a89ca724e40ff0eea4f5bdca08d40641af830 [file] [log] [blame]
// Copyright 2017 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "starboard/socket.h"
#include <winsock2.h>
#include <mswsock.h>
#include "starboard/log.h"
#include "starboard/shared/win32/set_non_blocking_internal.h"
#include "starboard/shared/win32/socket_internal.h"
namespace sbwin32 = starboard::shared::win32;
SbSocket SbSocketCreate(SbSocketAddressType address_type,
SbSocketProtocol protocol) {
int socket_domain;
switch (address_type) {
case kSbSocketAddressTypeIpv4:
socket_domain = AF_INET;
case kSbSocketAddressTypeIpv6:
socket_domain = AF_INET6;
return kSbSocketInvalid;
int socket_type;
int socket_protocol;
switch (protocol) {
case kSbSocketProtocolTcp:
socket_type = SOCK_STREAM;
socket_protocol = IPPROTO_TCP;
case kSbSocketProtocolUdp:
socket_type = SOCK_DGRAM;
socket_protocol = IPPROTO_UDP;
return kSbSocketInvalid;
// WSASocket with dwFlags=0, instead of socket() creates sockets that do not
// support overlapped IO.
SOCKET socket_handle =
WSASocketW(socket_domain, socket_type, socket_protocol, nullptr, 0, 0);
if (socket_handle == INVALID_SOCKET) {
return kSbSocketInvalid;
// From
// "When the TargetOsVersion member is set to a value for Windows Vista or
// later, reductions to the TCP receive buffer size on this socket using the
// SO_RCVBUF socket option are allowed even after a TCP connection has been
// establishment."
// "When the TargetOsVersion member is set to a value for Windows Vista or
// later, receive window auto-tuning is enabled and the TCP window scale
// factor is reduced to 2 from the default value of 8."
// The main impetus for this change:
// "The WsaBehaviorAutoTuning option is needed on Windows Vista for some
// Internet gateway devices and firewalls that do not correctly support data
// flows for TCP connections that use the WSopt extension and a windows scale
// factor. On Windows Vista, a receiver by default negotiates a window scale
// factor of 8 for a maximum true window size of 16,776,960 bytes. When data
// begins to flow on a fast link, Windows initially starts with a 64 Kilobyte
// true window size by setting the Window field of the TCP header to 256 and
// setting the window scale factor to 8 in the TCP options (256*2^8=64KB).
// Some Internet gateway devices and firewalls ignore the window scale factor
// and only look at the advertised Window field in the TCP header specified as
// 256, and drop incoming packets for the connection that contain more than
// 256 bytes of TCP data. To support TCP receive window scaling, a gateway
// device or firewall must monitor the TCP handshake and track the negotiated
// window scale factor as part of the TCP connection data. Also some
// applications and TCP stack implementations on other platforms ignore the
// TCP WSopt extension and the window scaling factor. So the remote host
// sending the data may send data at the rate advertised in the Window field
// of the TCP header (256 bytes). This can result in data being received very
// slowly by the receiver."
if (protocol == kSbSocketProtocolTcp) {
WSA_COMPATIBILITY_MODE compatibility_mode = {WsaBehaviorAll, NTDDI_VISTA};
DWORD kZero = 0;
int return_value = WSAIoctl(
socket_handle, SIO_SET_COMPATIBILITY_MODE, &compatibility_mode,
sizeof(WSA_COMPATIBILITY_MODE), nullptr, 0, &kZero, nullptr, nullptr);
if (return_value == SOCKET_ERROR) {
return kSbSocketInvalid;
// All Starboard sockets are non-blocking, so let's ensure it.
if (!sbwin32::SetNonBlocking(socket_handle)) {
// Something went wrong, we'll clean up and return failure.
return kSbSocketInvalid;
return new SbSocketPrivate(address_type, protocol, socket_handle);