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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.
package net
import (
"errors"
"fmt"
"io"
"net/internal/socktest"
"os"
"runtime"
"testing"
"time"
)
func TestCloseRead(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("not supported on %s", runtime.GOOS)
}
t.Parallel()
for _, network := range []string{"tcp", "unix", "unixpacket"} {
network := network
t.Run(network, func(t *testing.T) {
if !testableNetwork(network) {
t.Skipf("network %s is not testable on the current platform", network)
}
t.Parallel()
ln := newLocalListener(t, network)
switch network {
case "unix", "unixpacket":
defer os.Remove(ln.Addr().String())
}
defer ln.Close()
c, err := Dial(ln.Addr().Network(), ln.Addr().String())
if err != nil {
t.Fatal(err)
}
switch network {
case "unix", "unixpacket":
defer os.Remove(c.LocalAddr().String())
}
defer c.Close()
switch c := c.(type) {
case *TCPConn:
err = c.CloseRead()
case *UnixConn:
err = c.CloseRead()
}
if err != nil {
if perr := parseCloseError(err, true); perr != nil {
t.Error(perr)
}
t.Fatal(err)
}
var b [1]byte
n, err := c.Read(b[:])
if n != 0 || err == nil {
t.Fatalf("got (%d, %v); want (0, error)", n, err)
}
})
}
}
func TestCloseWrite(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("not supported on %s", runtime.GOOS)
}
t.Parallel()
deadline, _ := t.Deadline()
if !deadline.IsZero() {
// Leave 10% headroom on the deadline to report errors and clean up.
deadline = deadline.Add(-time.Until(deadline) / 10)
}
for _, network := range []string{"tcp", "unix", "unixpacket"} {
network := network
t.Run(network, func(t *testing.T) {
if !testableNetwork(network) {
t.Skipf("network %s is not testable on the current platform", network)
}
t.Parallel()
handler := func(ls *localServer, ln Listener) {
c, err := ln.Accept()
if err != nil {
t.Error(err)
return
}
// Workaround for https://go.dev/issue/49352.
// On arm64 macOS (current as of macOS 12.4),
// reading from a socket at the same time as the client
// is closing it occasionally hangs for 60 seconds before
// returning ECONNRESET. Sleep for a bit to give the
// socket time to close before trying to read from it.
if runtime.GOOS == "darwin" && runtime.GOARCH == "arm64" {
time.Sleep(10 * time.Millisecond)
}
if !deadline.IsZero() {
c.SetDeadline(deadline)
}
defer c.Close()
var b [1]byte
n, err := c.Read(b[:])
if n != 0 || err != io.EOF {
t.Errorf("got (%d, %v); want (0, io.EOF)", n, err)
return
}
switch c := c.(type) {
case *TCPConn:
err = c.CloseWrite()
case *UnixConn:
err = c.CloseWrite()
}
if err != nil {
if perr := parseCloseError(err, true); perr != nil {
t.Error(perr)
}
t.Error(err)
return
}
n, err = c.Write(b[:])
if err == nil {
t.Errorf("got (%d, %v); want (any, error)", n, err)
return
}
}
ls := newLocalServer(t, network)
defer ls.teardown()
if err := ls.buildup(handler); err != nil {
t.Fatal(err)
}
c, err := Dial(ls.Listener.Addr().Network(), ls.Listener.Addr().String())
if err != nil {
t.Fatal(err)
}
if !deadline.IsZero() {
c.SetDeadline(deadline)
}
switch network {
case "unix", "unixpacket":
defer os.Remove(c.LocalAddr().String())
}
defer c.Close()
switch c := c.(type) {
case *TCPConn:
err = c.CloseWrite()
case *UnixConn:
err = c.CloseWrite()
}
if err != nil {
if perr := parseCloseError(err, true); perr != nil {
t.Error(perr)
}
t.Fatal(err)
}
var b [1]byte
n, err := c.Read(b[:])
if n != 0 || err != io.EOF {
t.Fatalf("got (%d, %v); want (0, io.EOF)", n, err)
}
n, err = c.Write(b[:])
if err == nil {
t.Fatalf("got (%d, %v); want (any, error)", n, err)
}
})
}
}
func TestConnClose(t *testing.T) {
t.Parallel()
for _, network := range []string{"tcp", "unix", "unixpacket"} {
network := network
t.Run(network, func(t *testing.T) {
if !testableNetwork(network) {
t.Skipf("network %s is not testable on the current platform", network)
}
t.Parallel()
ln := newLocalListener(t, network)
switch network {
case "unix", "unixpacket":
defer os.Remove(ln.Addr().String())
}
defer ln.Close()
c, err := Dial(ln.Addr().Network(), ln.Addr().String())
if err != nil {
t.Fatal(err)
}
switch network {
case "unix", "unixpacket":
defer os.Remove(c.LocalAddr().String())
}
defer c.Close()
if err := c.Close(); err != nil {
if perr := parseCloseError(err, false); perr != nil {
t.Error(perr)
}
t.Fatal(err)
}
var b [1]byte
n, err := c.Read(b[:])
if n != 0 || err == nil {
t.Fatalf("got (%d, %v); want (0, error)", n, err)
}
})
}
}
func TestListenerClose(t *testing.T) {
t.Parallel()
for _, network := range []string{"tcp", "unix", "unixpacket"} {
network := network
t.Run(network, func(t *testing.T) {
if !testableNetwork(network) {
t.Skipf("network %s is not testable on the current platform", network)
}
t.Parallel()
ln := newLocalListener(t, network)
switch network {
case "unix", "unixpacket":
defer os.Remove(ln.Addr().String())
}
if err := ln.Close(); err != nil {
if perr := parseCloseError(err, false); perr != nil {
t.Error(perr)
}
t.Fatal(err)
}
c, err := ln.Accept()
if err == nil {
c.Close()
t.Fatal("should fail")
}
// Note: we cannot ensure that a subsequent Dial does not succeed, because
// we do not in general have any guarantee that ln.Addr is not immediately
// reused. (TCP sockets enter a TIME_WAIT state when closed, but that only
// applies to existing connections for the port — it does not prevent the
// port itself from being used for entirely new connections in the
// meantime.)
})
}
}
func TestPacketConnClose(t *testing.T) {
t.Parallel()
for _, network := range []string{"udp", "unixgram"} {
network := network
t.Run(network, func(t *testing.T) {
if !testableNetwork(network) {
t.Skipf("network %s is not testable on the current platform", network)
}
t.Parallel()
c := newLocalPacketListener(t, network)
switch network {
case "unixgram":
defer os.Remove(c.LocalAddr().String())
}
defer c.Close()
if err := c.Close(); err != nil {
if perr := parseCloseError(err, false); perr != nil {
t.Error(perr)
}
t.Fatal(err)
}
var b [1]byte
n, _, err := c.ReadFrom(b[:])
if n != 0 || err == nil {
t.Fatalf("got (%d, %v); want (0, error)", n, err)
}
})
}
}
func TestListenCloseListen(t *testing.T) {
const maxTries = 10
for tries := 0; tries < maxTries; tries++ {
ln := newLocalListener(t, "tcp")
addr := ln.Addr().String()
// TODO: This is racy. The selected address could be reused in between this
// Close and the subsequent Listen.
if err := ln.Close(); err != nil {
if perr := parseCloseError(err, false); perr != nil {
t.Error(perr)
}
t.Fatal(err)
}
ln, err := Listen("tcp", addr)
if err == nil {
// Success. (This test didn't always make it here earlier.)
ln.Close()
return
}
t.Errorf("failed on try %d/%d: %v", tries+1, maxTries, err)
}
t.Fatalf("failed to listen/close/listen on same address after %d tries", maxTries)
}
// See golang.org/issue/6163, golang.org/issue/6987.
func TestAcceptIgnoreAbortedConnRequest(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("%s does not have full support of socktest", runtime.GOOS)
}
syserr := make(chan error)
go func() {
defer close(syserr)
for _, err := range abortedConnRequestErrors {
syserr <- err
}
}()
sw.Set(socktest.FilterAccept, func(so *socktest.Status) (socktest.AfterFilter, error) {
if err, ok := <-syserr; ok {
return nil, err
}
return nil, nil
})
defer sw.Set(socktest.FilterAccept, nil)
operr := make(chan error, 1)
handler := func(ls *localServer, ln Listener) {
defer close(operr)
c, err := ln.Accept()
if err != nil {
if perr := parseAcceptError(err); perr != nil {
operr <- perr
}
operr <- err
return
}
c.Close()
}
ls := newLocalServer(t, "tcp")
defer ls.teardown()
if err := ls.buildup(handler); err != nil {
t.Fatal(err)
}
c, err := Dial(ls.Listener.Addr().Network(), ls.Listener.Addr().String())
if err != nil {
t.Fatal(err)
}
c.Close()
for err := range operr {
t.Error(err)
}
}
func TestZeroByteRead(t *testing.T) {
t.Parallel()
for _, network := range []string{"tcp", "unix", "unixpacket"} {
network := network
t.Run(network, func(t *testing.T) {
if !testableNetwork(network) {
t.Skipf("network %s is not testable on the current platform", network)
}
t.Parallel()
ln := newLocalListener(t, network)
connc := make(chan Conn, 1)
defer func() {
ln.Close()
for c := range connc {
if c != nil {
c.Close()
}
}
}()
go func() {
defer close(connc)
c, err := ln.Accept()
if err != nil {
t.Error(err)
}
connc <- c // might be nil
}()
c, err := Dial(network, ln.Addr().String())
if err != nil {
t.Fatal(err)
}
defer c.Close()
sc := <-connc
if sc == nil {
return
}
defer sc.Close()
if runtime.GOOS == "windows" {
// A zero byte read on Windows caused a wait for readability first.
// Rather than change that behavior, satisfy it in this test.
// See Issue 15735.
go io.WriteString(sc, "a")
}
n, err := c.Read(nil)
if n != 0 || err != nil {
t.Errorf("%s: zero byte client read = %v, %v; want 0, nil", network, n, err)
}
if runtime.GOOS == "windows" {
// Same as comment above.
go io.WriteString(c, "a")
}
n, err = sc.Read(nil)
if n != 0 || err != nil {
t.Errorf("%s: zero byte server read = %v, %v; want 0, nil", network, n, err)
}
})
}
}
// withTCPConnPair sets up a TCP connection between two peers, then
// runs peer1 and peer2 concurrently. withTCPConnPair returns when
// both have completed.
func withTCPConnPair(t *testing.T, peer1, peer2 func(c *TCPConn) error) {
t.Helper()
ln := newLocalListener(t, "tcp")
defer ln.Close()
errc := make(chan error, 2)
go func() {
c1, err := ln.Accept()
if err != nil {
errc <- err
return
}
err = peer1(c1.(*TCPConn))
c1.Close()
errc <- err
}()
go func() {
c2, err := Dial("tcp", ln.Addr().String())
if err != nil {
errc <- err
return
}
err = peer2(c2.(*TCPConn))
c2.Close()
errc <- err
}()
for i := 0; i < 2; i++ {
if err := <-errc; err != nil {
t.Error(err)
}
}
}
// Tests that a blocked Read is interrupted by a concurrent SetReadDeadline
// modifying that Conn's read deadline to the past.
// See golang.org/cl/30164 which documented this. The net/http package
// depends on this.
func TestReadTimeoutUnblocksRead(t *testing.T) {
serverDone := make(chan struct{})
server := func(cs *TCPConn) error {
defer close(serverDone)
errc := make(chan error, 1)
go func() {
defer close(errc)
go func() {
// TODO: find a better way to wait
// until we're blocked in the cs.Read
// call below. Sleep is lame.
time.Sleep(100 * time.Millisecond)
// Interrupt the upcoming Read, unblocking it:
cs.SetReadDeadline(time.Unix(123, 0)) // time in the past
}()
var buf [1]byte
n, err := cs.Read(buf[:1])
if n != 0 || err == nil {
errc <- fmt.Errorf("Read = %v, %v; want 0, non-nil", n, err)
}
}()
select {
case err := <-errc:
return err
case <-time.After(5 * time.Second):
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
println("Stacks at timeout:\n", string(buf))
return errors.New("timeout waiting for Read to finish")
}
}
// Do nothing in the client. Never write. Just wait for the
// server's half to be done.
client := func(*TCPConn) error {
<-serverDone
return nil
}
withTCPConnPair(t, client, server)
}
// Issue 17695: verify that a blocked Read is woken up by a Close.
func TestCloseUnblocksRead(t *testing.T) {
t.Parallel()
server := func(cs *TCPConn) error {
// Give the client time to get stuck in a Read:
time.Sleep(20 * time.Millisecond)
cs.Close()
return nil
}
client := func(ss *TCPConn) error {
n, err := ss.Read([]byte{0})
if n != 0 || err != io.EOF {
return fmt.Errorf("Read = %v, %v; want 0, EOF", n, err)
}
return nil
}
withTCPConnPair(t, client, server)
}
// Issue 24808: verify that ECONNRESET is not temporary for read.
func TestNotTemporaryRead(t *testing.T) {
t.Parallel()
ln := newLocalListener(t, "tcp")
serverDone := make(chan struct{})
dialed := make(chan struct{})
go func() {
defer close(serverDone)
cs, err := ln.Accept()
if err != nil {
return
}
<-dialed
cs.(*TCPConn).SetLinger(0)
cs.Close()
}()
defer func() {
ln.Close()
<-serverDone
}()
ss, err := Dial("tcp", ln.Addr().String())
close(dialed)
if err != nil {
t.Fatal(err)
}
defer ss.Close()
_, err = ss.Read([]byte{0})
if err == nil {
t.Fatal("Read succeeded unexpectedly")
} else if err == io.EOF {
// This happens on Plan 9, but for some reason (prior to CL 385314) it was
// accepted everywhere else too.
if runtime.GOOS == "plan9" {
return
}
t.Fatal("Read unexpectedly returned io.EOF after socket was abruptly closed")
}
if ne, ok := err.(Error); !ok {
t.Errorf("Read error does not implement net.Error: %v", err)
} else if ne.Temporary() {
t.Errorf("Read error is unexpectedly temporary: %v", err)
}
}
// The various errors should implement the Error interface.
func TestErrors(t *testing.T) {
var (
_ Error = &OpError{}
_ Error = &ParseError{}
_ Error = &AddrError{}
_ Error = UnknownNetworkError("")
_ Error = InvalidAddrError("")
_ Error = &timeoutError{}
_ Error = &DNSConfigError{}
_ Error = &DNSError{}
)
// ErrClosed was introduced as type error, so we can't check
// it using a declaration.
if _, ok := ErrClosed.(Error); !ok {
t.Fatal("ErrClosed does not implement Error")
}
}