mirror of
https://github.com/autc04/Retro68.git
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179 lines
4.6 KiB
Go
179 lines
4.6 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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"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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// 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 deadline, ok := ctx.Deadline(); ok && !deadline.IsZero() {
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fd.pfd.SetWriteDeadline(deadline)
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defer fd.pfd.SetWriteDeadline(noDeadline)
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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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// Wait for the goroutine converting context.Done into a write timeout
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// to exist, otherwise our caller might cancel the context and
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// cause fd.setWriteDeadline(aLongTimeAgo) to cancel a successful dial.
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done := make(chan bool) // must be unbuffered
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defer func() { done <- true }()
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go func() {
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select {
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case <-ctx.Done():
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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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<-done
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case <-done:
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}
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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
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return nil, syscall.EWINDOWS
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}
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