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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build aix darwin dragonfly freebsd hurd linux nacl netbsd openbsd solaris
package net
import (
"context"
"internal/poll"
"os"
"runtime"
"syscall"
"time"
)
// Network file descriptor.
type netFD struct {
pfd poll.FD
// immutable until Close
family int
sotype int
isConnected bool // handshake completed or use of association with peer
net string
laddr Addr
raddr Addr
}
func newFD(sysfd, family, sotype int, net string) (*netFD, error) {
ret := &netFD{
pfd: poll.FD{
Sysfd: sysfd,
IsStream: sotype == syscall.SOCK_STREAM,
ZeroReadIsEOF: sotype != syscall.SOCK_DGRAM && sotype != syscall.SOCK_RAW,
},
family: family,
sotype: sotype,
net: net,
}
return ret, nil
}
func (fd *netFD) init() error {
return fd.pfd.Init(fd.net, true)
}
func (fd *netFD) setAddr(laddr, raddr Addr) {
fd.laddr = laddr
fd.raddr = raddr
runtime.SetFinalizer(fd, (*netFD).Close)
}
func (fd *netFD) name() string {
var ls, rs string
if fd.laddr != nil {
ls = fd.laddr.String()
}
if fd.raddr != nil {
rs = fd.raddr.String()
}
return fd.net + ":" + ls + "->" + rs
}
func (fd *netFD) connect(ctx context.Context, la, ra syscall.Sockaddr) (rsa syscall.Sockaddr, ret error) {
// Do not need to call fd.writeLock here,
// because fd is not yet accessible to user,
// so no concurrent operations are possible.
switch err := connectFunc(fd.pfd.Sysfd, ra); err {
case syscall.EINPROGRESS, syscall.EALREADY, syscall.EINTR:
case nil, syscall.EISCONN:
select {
case <-ctx.Done():
return nil, mapErr(ctx.Err())
default:
}
if err := fd.pfd.Init(fd.net, true); err != nil {
return nil, err
}
runtime.KeepAlive(fd)
return nil, nil
case syscall.EINVAL:
// On Solaris we can see EINVAL if the socket has
// already been accepted and closed by the server.
// Treat this as a successful connection--writes to
// the socket will see EOF. For details and a test
// case in C see https://golang.org/issue/6828.
if runtime.GOOS == "solaris" {
return nil, nil
}
fallthrough
default:
return nil, os.NewSyscallError("connect", err)
}
if err := fd.pfd.Init(fd.net, true); err != nil {
return nil, err
}
if deadline, _ := ctx.Deadline(); !deadline.IsZero() {
fd.pfd.SetWriteDeadline(deadline)
defer fd.pfd.SetWriteDeadline(noDeadline)
}
// Start the "interrupter" goroutine, if this context might be canceled.
// (The background context cannot)
//
// The interrupter goroutine waits for the context to be done and
// interrupts the dial (by altering the fd's write deadline, which
// wakes up waitWrite).
if ctx != context.Background() {
// Wait for the interrupter goroutine to exit before returning
// from connect.
done := make(chan struct{})
interruptRes := make(chan error)
defer func() {
close(done)
if ctxErr := <-interruptRes; ctxErr != nil && ret == nil {
// The interrupter goroutine called SetWriteDeadline,
// but the connect code below had returned from
// waitWrite already and did a successful connect (ret
// == nil). Because we've now poisoned the connection
// by making it unwritable, don't return a successful
// dial. This was issue 16523.
ret = mapErr(ctxErr)
fd.Close() // prevent a leak
}
}()
go func() {
select {
case <-ctx.Done():
// Force the runtime's poller to immediately give up
// waiting for writability, unblocking waitWrite
// below.
fd.pfd.SetWriteDeadline(aLongTimeAgo)
testHookCanceledDial()
interruptRes <- ctx.Err()
case <-done:
interruptRes <- nil
}
}()
}
for {
// Performing multiple connect system calls on a
// non-blocking socket under Unix variants does not
// necessarily result in earlier errors being
// returned. Instead, once runtime-integrated network
// poller tells us that the socket is ready, get the
// SO_ERROR socket option to see if the connection
// succeeded or failed. See issue 7474 for further
// details.
if err := fd.pfd.WaitWrite(); err != nil {
select {
case <-ctx.Done():
return nil, mapErr(ctx.Err())
default:
}
return nil, err
}
nerr, err := getsockoptIntFunc(fd.pfd.Sysfd, syscall.SOL_SOCKET, syscall.SO_ERROR)
if err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
switch err := syscall.Errno(nerr); err {
case syscall.EINPROGRESS, syscall.EALREADY, syscall.EINTR:
case syscall.EISCONN:
return nil, nil
case syscall.Errno(0):
// The runtime poller can wake us up spuriously;
// see issues 14548 and 19289. Check that we are
// really connected; if not, wait again.
if rsa, err := syscall.Getpeername(fd.pfd.Sysfd); err == nil {
return rsa, nil
}
default:
return nil, os.NewSyscallError("connect", err)
}
runtime.KeepAlive(fd)
}
}
func (fd *netFD) Close() error {
runtime.SetFinalizer(fd, nil)
return fd.pfd.Close()
}
func (fd *netFD) shutdown(how int) error {
err := fd.pfd.Shutdown(how)
runtime.KeepAlive(fd)
return wrapSyscallError("shutdown", err)
}
func (fd *netFD) closeRead() error {
return fd.shutdown(syscall.SHUT_RD)
}
func (fd *netFD) closeWrite() error {
return fd.shutdown(syscall.SHUT_WR)
}
func (fd *netFD) Read(p []byte) (n int, err error) {
n, err = fd.pfd.Read(p)
runtime.KeepAlive(fd)
return n, wrapSyscallError("read", err)
}
func (fd *netFD) readFrom(p []byte) (n int, sa syscall.Sockaddr, err error) {
n, sa, err = fd.pfd.ReadFrom(p)
runtime.KeepAlive(fd)
return n, sa, wrapSyscallError("recvfrom", err)
}
func (fd *netFD) readMsg(p []byte, oob []byte) (n, oobn, flags int, sa syscall.Sockaddr, err error) {
n, oobn, flags, sa, err = fd.pfd.ReadMsg(p, oob)
runtime.KeepAlive(fd)
return n, oobn, flags, sa, wrapSyscallError("recvmsg", err)
}
func (fd *netFD) Write(p []byte) (nn int, err error) {
nn, err = fd.pfd.Write(p)
runtime.KeepAlive(fd)
return nn, wrapSyscallError("write", err)
}
func (fd *netFD) writeTo(p []byte, sa syscall.Sockaddr) (n int, err error) {
n, err = fd.pfd.WriteTo(p, sa)
runtime.KeepAlive(fd)
return n, wrapSyscallError("sendto", err)
}
func (fd *netFD) writeMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err error) {
n, oobn, err = fd.pfd.WriteMsg(p, oob, sa)
runtime.KeepAlive(fd)
return n, oobn, wrapSyscallError("sendmsg", err)
}
func (fd *netFD) accept() (netfd *netFD, err error) {
d, rsa, errcall, err := fd.pfd.Accept()
if err != nil {
if errcall != "" {
err = wrapSyscallError(errcall, err)
}
return nil, err
}
if netfd, err = newFD(d, fd.family, fd.sotype, fd.net); err != nil {
poll.CloseFunc(d)
return nil, err
}
if err = netfd.init(); err != nil {
fd.Close()
return nil, err
}
lsa, _ := syscall.Getsockname(netfd.pfd.Sysfd)
netfd.setAddr(netfd.addrFunc()(lsa), netfd.addrFunc()(rsa))
return netfd, nil
}
func (fd *netFD) dup() (f *os.File, err error) {
ns, call, err := fd.pfd.Dup()
if err != nil {
if call != "" {
err = os.NewSyscallError(call, err)
}
return nil, err
}
return os.NewFile(uintptr(ns), fd.name()), nil
}
func (fd *netFD) SetDeadline(t time.Time) error {
return fd.pfd.SetDeadline(t)
}
func (fd *netFD) SetReadDeadline(t time.Time) error {
return fd.pfd.SetReadDeadline(t)
}
func (fd *netFD) SetWriteDeadline(t time.Time) error {
return fd.pfd.SetWriteDeadline(t)
}
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