mirror of https://go.googlesource.com/go
222 lines
6.2 KiB
Go
222 lines
6.2 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"context"
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"internal/poll"
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"internal/syscall/windows"
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"os"
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"runtime"
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"syscall"
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"unsafe"
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)
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const (
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readSyscallName = "wsarecv"
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readFromSyscallName = "wsarecvfrom"
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readMsgSyscallName = "wsarecvmsg"
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writeSyscallName = "wsasend"
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writeToSyscallName = "wsasendto"
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writeMsgSyscallName = "wsasendmsg"
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)
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func init() {
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poll.InitWSA()
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}
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// canUseConnectEx reports whether we can use the ConnectEx Windows API call
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// for the given network type.
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func canUseConnectEx(net string) bool {
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switch net {
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case "tcp", "tcp4", "tcp6":
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return true
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}
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// ConnectEx windows API does not support connectionless sockets.
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return false
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}
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func newFD(sysfd syscall.Handle, family, sotype int, net string) (*netFD, error) {
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ret := &netFD{
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pfd: poll.FD{
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Sysfd: sysfd,
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IsStream: sotype == syscall.SOCK_STREAM,
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ZeroReadIsEOF: sotype != syscall.SOCK_DGRAM && sotype != syscall.SOCK_RAW,
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},
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family: family,
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sotype: sotype,
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net: net,
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}
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return ret, nil
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}
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func (fd *netFD) init() error {
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errcall, err := fd.pfd.Init(fd.net, true)
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if errcall != "" {
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err = wrapSyscallError(errcall, err)
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}
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return err
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}
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// Always returns nil for connected peer address result.
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func (fd *netFD) connect(ctx context.Context, la, ra syscall.Sockaddr) (syscall.Sockaddr, error) {
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// Do not need to call fd.writeLock here,
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// because fd is not yet accessible to user,
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// so no concurrent operations are possible.
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if err := fd.init(); err != nil {
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return nil, err
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}
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if ctx.Done() != nil {
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// Propagate the Context's deadline and cancellation.
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// If the context is already done, or if it has a nonzero deadline,
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// ensure that that is applied before the call to ConnectEx begins
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// so that we don't return spurious connections.
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defer fd.pfd.SetWriteDeadline(noDeadline)
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if ctx.Err() != nil {
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fd.pfd.SetWriteDeadline(aLongTimeAgo)
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} else {
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if deadline, ok := ctx.Deadline(); ok && !deadline.IsZero() {
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fd.pfd.SetWriteDeadline(deadline)
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}
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done := make(chan struct{})
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stop := context.AfterFunc(ctx, func() {
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// Force the runtime's poller to immediately give
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// up waiting for writability.
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fd.pfd.SetWriteDeadline(aLongTimeAgo)
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close(done)
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})
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defer func() {
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if !stop() {
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// Wait for the call to SetWriteDeadline to complete so that we can
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// reset the deadline if everything else succeeded.
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<-done
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}
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}()
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}
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}
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if !canUseConnectEx(fd.net) {
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err := connectFunc(fd.pfd.Sysfd, ra)
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return nil, os.NewSyscallError("connect", err)
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}
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// ConnectEx windows API requires an unconnected, previously bound socket.
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if la == nil {
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switch ra.(type) {
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case *syscall.SockaddrInet4:
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la = &syscall.SockaddrInet4{}
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case *syscall.SockaddrInet6:
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la = &syscall.SockaddrInet6{}
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default:
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panic("unexpected type in connect")
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}
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if err := syscall.Bind(fd.pfd.Sysfd, la); err != nil {
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return nil, os.NewSyscallError("bind", err)
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}
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}
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var isloopback bool
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switch ra := ra.(type) {
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case *syscall.SockaddrInet4:
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isloopback = ra.Addr[0] == 127
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case *syscall.SockaddrInet6:
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isloopback = ra.Addr == [16]byte(IPv6loopback)
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default:
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panic("unexpected type in connect")
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}
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if isloopback {
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// This makes ConnectEx() fails faster if the target port on the localhost
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// is not reachable, instead of waiting for 2s.
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params := windows.TCP_INITIAL_RTO_PARAMETERS{
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Rtt: windows.TCP_INITIAL_RTO_UNSPECIFIED_RTT, // use the default or overridden by the Administrator
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MaxSynRetransmissions: 1, // minimum possible value before Windows 10.0.16299
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}
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if windows.SupportTCPInitialRTONoSYNRetransmissions() {
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// In Windows 10.0.16299 TCP_INITIAL_RTO_NO_SYN_RETRANSMISSIONS makes ConnectEx() fails instantly.
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params.MaxSynRetransmissions = windows.TCP_INITIAL_RTO_NO_SYN_RETRANSMISSIONS
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}
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var out uint32
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// Don't abort the connection if WSAIoctl fails, as it is only an optimization.
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// If it fails reliably, we expect TestDialClosedPortFailFast to detect it.
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_ = fd.pfd.WSAIoctl(windows.SIO_TCP_INITIAL_RTO, (*byte)(unsafe.Pointer(¶ms)), uint32(unsafe.Sizeof(params)), nil, 0, &out, nil, 0)
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}
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// Call ConnectEx API.
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if err := fd.pfd.ConnectEx(ra); err != nil {
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select {
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case <-ctx.Done():
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return nil, mapErr(ctx.Err())
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default:
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if _, ok := err.(syscall.Errno); ok {
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err = os.NewSyscallError("connectex", err)
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}
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return nil, err
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}
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}
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// Refresh socket properties.
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return nil, os.NewSyscallError("setsockopt", syscall.Setsockopt(fd.pfd.Sysfd, syscall.SOL_SOCKET, syscall.SO_UPDATE_CONNECT_CONTEXT, (*byte)(unsafe.Pointer(&fd.pfd.Sysfd)), int32(unsafe.Sizeof(fd.pfd.Sysfd))))
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}
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func (c *conn) writeBuffers(v *Buffers) (int64, error) {
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if !c.ok() {
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return 0, syscall.EINVAL
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}
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n, err := c.fd.writeBuffers(v)
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if err != nil {
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return n, &OpError{Op: "wsasend", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
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}
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return n, nil
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}
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func (fd *netFD) writeBuffers(buf *Buffers) (int64, error) {
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n, err := fd.pfd.Writev((*[][]byte)(buf))
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runtime.KeepAlive(fd)
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return n, wrapSyscallError("wsasend", err)
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}
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func (fd *netFD) accept() (*netFD, error) {
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s, rawsa, rsan, errcall, err := fd.pfd.Accept(func() (syscall.Handle, error) {
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return sysSocket(fd.family, fd.sotype, 0)
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})
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if err != nil {
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if errcall != "" {
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err = wrapSyscallError(errcall, err)
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}
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return nil, err
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}
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// Associate our new socket with IOCP.
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netfd, err := newFD(s, fd.family, fd.sotype, fd.net)
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if err != nil {
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poll.CloseFunc(s)
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return nil, err
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}
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if err := netfd.init(); err != nil {
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fd.Close()
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return nil, err
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}
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// Get local and peer addr out of AcceptEx buffer.
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var lrsa, rrsa *syscall.RawSockaddrAny
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var llen, rlen int32
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syscall.GetAcceptExSockaddrs((*byte)(unsafe.Pointer(&rawsa[0])),
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0, rsan, rsan, &lrsa, &llen, &rrsa, &rlen)
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lsa, _ := lrsa.Sockaddr()
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rsa, _ := rrsa.Sockaddr()
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netfd.setAddr(netfd.addrFunc()(lsa), netfd.addrFunc()(rsa))
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return netfd, nil
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}
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// Unimplemented functions.
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func (fd *netFD) dup() (*os.File, error) {
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// TODO: Implement this, perhaps using internal/poll.DupCloseOnExec.
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return nil, syscall.EWINDOWS
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}
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