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// Copyright 2011 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 (
"bytes"
"flag"
"fmt"
"io"
"os"
"os/exec"
"reflect"
"regexp"
"runtime"
"strconv"
"sync"
"testing"
"time"
)
func newLocalListener(t *testing.T) Listener {
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
ln, err = Listen("tcp6", "[::1]:0")
}
if err != nil {
t.Fatal(err)
}
return ln
}
func TestDialTimeout(t *testing.T) {
origBacklog := listenerBacklog
defer func() {
listenerBacklog = origBacklog
}()
listenerBacklog = 1
ln := newLocalListener(t)
defer ln.Close()
errc := make(chan error)
numConns := listenerBacklog + 100
// TODO(bradfitz): It's hard to test this in a portable
// way. This is unfortunate, but works for now.
switch runtime.GOOS {
case "linux":
// The kernel will start accepting TCP connections before userspace
// gets a chance to not accept them, so fire off a bunch to fill up
// the kernel's backlog. Then we test we get a failure after that.
for i := 0; i < numConns; i++ {
go func() {
_, err := DialTimeout("tcp", ln.Addr().String(), 200*time.Millisecond)
errc <- err
}()
}
case "darwin", "plan9", "windows":
// At least OS X 10.7 seems to accept any number of
// connections, ignoring listen's backlog, so resort
// to connecting to a hopefully-dead 127/8 address.
// Same for windows.
//
// Use an IANA reserved port (49151) instead of 80, because
// on our 386 builder, this Dial succeeds, connecting
// to an IIS web server somewhere. The data center
// or VM or firewall must be stealing the TCP connection.
//
// IANA Service Name and Transport Protocol Port Number Registry
// <http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml>
go func() {
c, err := DialTimeout("tcp", "127.0.71.111:49151", 200*time.Millisecond)
if err == nil {
err = fmt.Errorf("unexpected: connected to %s!", c.RemoteAddr())
c.Close()
}
errc <- err
}()
default:
// TODO(bradfitz):
// OpenBSD may have a reject route to 127/8 except 127.0.0.1/32
// by default. FreeBSD likely works, but is untested.
// TODO(rsc):
// The timeout never happens on Windows. Why? Issue 3016.
t.Skipf("skipping test on %q; untested.", runtime.GOOS)
}
connected := 0
for {
select {
case <-time.After(15 * time.Second):
t.Fatal("too slow")
case err := <-errc:
if err == nil {
connected++
if connected == numConns {
t.Fatal("all connections connected; expected some to time out")
}
} else {
terr, ok := err.(timeout)
if !ok {
t.Fatalf("got error %q; want error with timeout interface", err)
}
if !terr.Timeout() {
t.Fatalf("got error %q; not a timeout", err)
}
// Pass. We saw a timeout error.
return
}
}
}
}
func TestSelfConnect(t *testing.T) {
if runtime.GOOS == "windows" {
// TODO(brainman): do not know why it hangs.
t.Skip("skipping known-broken test on windows")
}
// Test that Dial does not honor self-connects.
// See the comment in DialTCP.
// Find a port that would be used as a local address.
l, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
c, err := Dial("tcp", l.Addr().String())
if err != nil {
t.Fatal(err)
}
addr := c.LocalAddr().String()
c.Close()
l.Close()
// Try to connect to that address repeatedly.
n := 100000
if testing.Short() {
n = 1000
}
switch runtime.GOOS {
case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9", "solaris", "windows":
// Non-Linux systems take a long time to figure
// out that there is nothing listening on localhost.
n = 100
}
for i := 0; i < n; i++ {
c, err := DialTimeout("tcp", addr, time.Millisecond)
if err == nil {
if c.LocalAddr().String() == addr {
t.Errorf("#%d: Dial %q self-connect", i, addr)
} else {
t.Logf("#%d: Dial %q succeeded - possibly racing with other listener", i, addr)
}
c.Close()
}
}
}
var runErrorTest = flag.Bool("run_error_test", false, "let TestDialError check for dns errors")
type DialErrorTest struct {
Net string
Raddr string
Pattern string
}
var dialErrorTests = []DialErrorTest{
{
"datakit", "mh/astro/r70",
"dial datakit mh/astro/r70: unknown network datakit",
},
{
"tcp", "127.0.0.1:☺",
"dial tcp 127.0.0.1:☺: unknown port tcp/☺",
},
{
"tcp", "no-such-name.google.com.:80",
"dial tcp no-such-name.google.com.:80: lookup no-such-name.google.com.( on .*)?: no (.*)",
},
{
"tcp", "no-such-name.no-such-top-level-domain.:80",
"dial tcp no-such-name.no-such-top-level-domain.:80: lookup no-such-name.no-such-top-level-domain.( on .*)?: no (.*)",
},
{
"tcp", "no-such-name:80",
`dial tcp no-such-name:80: lookup no-such-name\.(.*\.)?( on .*)?: no (.*)`,
},
{
"tcp", "mh/astro/r70:http",
"dial tcp mh/astro/r70:http: lookup mh/astro/r70: invalid domain name",
},
{
"unix", "/etc/file-not-found",
"dial unix /etc/file-not-found: no such file or directory",
},
{
"unix", "/etc/",
"dial unix /etc/: (permission denied|socket operation on non-socket|connection refused)",
},
{
"unixpacket", "/etc/file-not-found",
"dial unixpacket /etc/file-not-found: no such file or directory",
},
{
"unixpacket", "/etc/",
"dial unixpacket /etc/: (permission denied|socket operation on non-socket|connection refused)",
},
}
var duplicateErrorPattern = `dial (.*) dial (.*)`
func TestDialError(t *testing.T) {
if !*runErrorTest {
t.Logf("test disabled; use -run_error_test to enable")
return
}
for i, tt := range dialErrorTests {
c, err := Dial(tt.Net, tt.Raddr)
if c != nil {
c.Close()
}
if err == nil {
t.Errorf("#%d: nil error, want match for %#q", i, tt.Pattern)
continue
}
s := err.Error()
match, _ := regexp.MatchString(tt.Pattern, s)
if !match {
t.Errorf("#%d: %q, want match for %#q", i, s, tt.Pattern)
}
match, _ = regexp.MatchString(duplicateErrorPattern, s)
if match {
t.Errorf("#%d: %q, duplicate error return from Dial", i, s)
}
}
}
var invalidDialAndListenArgTests = []struct {
net string
addr string
err error
}{
{"foo", "bar", &OpError{Op: "dial", Net: "foo", Addr: nil, Err: UnknownNetworkError("foo")}},
{"baz", "", &OpError{Op: "listen", Net: "baz", Addr: nil, Err: UnknownNetworkError("baz")}},
{"tcp", "", &OpError{Op: "dial", Net: "tcp", Addr: nil, Err: errMissingAddress}},
}
func TestInvalidDialAndListenArgs(t *testing.T) {
for _, tt := range invalidDialAndListenArgTests {
var err error
switch tt.err.(*OpError).Op {
case "dial":
_, err = Dial(tt.net, tt.addr)
case "listen":
_, err = Listen(tt.net, tt.addr)
}
if !reflect.DeepEqual(tt.err, err) {
t.Fatalf("got %#v; expected %#v", err, tt.err)
}
}
}
func TestDialTimeoutFDLeak(t *testing.T) {
if runtime.GOOS != "linux" {
// TODO(bradfitz): test on other platforms
t.Skipf("skipping test on %q", runtime.GOOS)
}
ln := newLocalListener(t)
defer ln.Close()
type connErr struct {
conn Conn
err error
}
dials := listenerBacklog + 100
// used to be listenerBacklog + 5, but was found to be unreliable, issue 4384.
maxGoodConnect := listenerBacklog + runtime.NumCPU()*10
resc := make(chan connErr)
for i := 0; i < dials; i++ {
go func() {
conn, err := DialTimeout("tcp", ln.Addr().String(), 500*time.Millisecond)
resc <- connErr{conn, err}
}()
}
var firstErr string
var ngood int
var toClose []io.Closer
for i := 0; i < dials; i++ {
ce := <-resc
if ce.err == nil {
ngood++
if ngood > maxGoodConnect {
t.Errorf("%d good connects; expected at most %d", ngood, maxGoodConnect)
}
toClose = append(toClose, ce.conn)
continue
}
err := ce.err
if firstErr == "" {
firstErr = err.Error()
} else if err.Error() != firstErr {
t.Fatalf("inconsistent error messages: first was %q, then later %q", firstErr, err)
}
}
for _, c := range toClose {
c.Close()
}
for i := 0; i < 100; i++ {
if got := numFD(); got < dials {
// Test passes.
return
}
time.Sleep(10 * time.Millisecond)
}
if got := numFD(); got >= dials {
t.Errorf("num fds after %d timeouts = %d; want <%d", dials, got, dials)
}
}
func numTCP() (ntcp, nopen, nclose int, err error) {
lsof, err := exec.Command("lsof", "-n", "-p", strconv.Itoa(os.Getpid())).Output()
if err != nil {
return 0, 0, 0, err
}
ntcp += bytes.Count(lsof, []byte("TCP"))
for _, state := range []string{"LISTEN", "SYN_SENT", "SYN_RECEIVED", "ESTABLISHED"} {
nopen += bytes.Count(lsof, []byte(state))
}
for _, state := range []string{"CLOSED", "CLOSE_WAIT", "LAST_ACK", "FIN_WAIT_1", "FIN_WAIT_2", "CLOSING", "TIME_WAIT"} {
nclose += bytes.Count(lsof, []byte(state))
}
return ntcp, nopen, nclose, nil
}
func TestDialMultiFDLeak(t *testing.T) {
t.Skip("flaky test - golang.org/issue/8764")
if !supportsIPv4 || !supportsIPv6 {
t.Skip("neither ipv4 nor ipv6 is supported")
}
halfDeadServer := func(dss *dualStackServer, ln Listener) {
for {
if c, err := ln.Accept(); err != nil {
return
} else {
// It just keeps established
// connections like a half-dead server
// does.
dss.putConn(c)
}
}
}
dss, err := newDualStackServer([]streamListener{
{net: "tcp4", addr: "127.0.0.1"},
{net: "tcp6", addr: "[::1]"},
})
if err != nil {
t.Fatalf("newDualStackServer failed: %v", err)
}
defer dss.teardown()
if err := dss.buildup(halfDeadServer); err != nil {
t.Fatalf("dualStackServer.buildup failed: %v", err)
}
_, before, _, err := numTCP()
if err != nil {
t.Skipf("skipping test; error finding or running lsof: %v", err)
}
var wg sync.WaitGroup
portnum, _, _ := dtoi(dss.port, 0)
ras := addrList{
// Losers that will fail to connect, see RFC 6890.
&TCPAddr{IP: IPv4(198, 18, 0, 254), Port: portnum},
&TCPAddr{IP: ParseIP("2001:2::254"), Port: portnum},
// Winner candidates of this race.
&TCPAddr{IP: IPv4(127, 0, 0, 1), Port: portnum},
&TCPAddr{IP: IPv6loopback, Port: portnum},
// Losers that will have established connections.
&TCPAddr{IP: IPv4(127, 0, 0, 1), Port: portnum},
&TCPAddr{IP: IPv6loopback, Port: portnum},
}
const T1 = 10 * time.Millisecond
const T2 = 2 * T1
const N = 10
for i := 0; i < N; i++ {
wg.Add(1)
go func() {
defer wg.Done()
if c, err := dialMulti("tcp", "fast failover test", nil, ras, time.Now().Add(T1)); err == nil {
c.Close()
}
}()
}
wg.Wait()
time.Sleep(T2)
ntcp, after, nclose, err := numTCP()
if err != nil {
t.Skipf("skipping test; error finding or running lsof: %v", err)
}
t.Logf("tcp sessions: %v, open sessions: %v, closing sessions: %v", ntcp, after, nclose)
if after != before {
t.Fatalf("got %v open sessions; expected %v", after, before)
}
}
func numFD() int {
if runtime.GOOS == "linux" {
f, err := os.Open("/proc/self/fd")
if err != nil {
panic(err)
}
defer f.Close()
names, err := f.Readdirnames(0)
if err != nil {
panic(err)
}
return len(names)
}
// All tests using this should be skipped anyway, but:
panic("numFDs not implemented on " + runtime.GOOS)
}
func TestDialer(t *testing.T) {
ln, err := Listen("tcp4", "127.0.0.1:0")
if err != nil {
t.Fatalf("Listen failed: %v", err)
}
defer ln.Close()
ch := make(chan error, 1)
go func() {
c, err := ln.Accept()
if err != nil {
ch <- fmt.Errorf("Accept failed: %v", err)
return
}
defer c.Close()
ch <- nil
}()
laddr, err := ResolveTCPAddr("tcp4", "127.0.0.1:0")
if err != nil {
t.Fatalf("ResolveTCPAddr failed: %v", err)
}
d := &Dialer{LocalAddr: laddr}
c, err := d.Dial("tcp4", ln.Addr().String())
if err != nil {
t.Fatalf("Dial failed: %v", err)
}
defer c.Close()
c.Read(make([]byte, 1))
err = <-ch
if err != nil {
t.Error(err)
}
}
func TestDialDualStackLocalhost(t *testing.T) {
switch runtime.GOOS {
case "nacl":
t.Skipf("skipping test on %q", runtime.GOOS)
}
if ips, err := LookupIP("localhost"); err != nil {
t.Fatalf("LookupIP failed: %v", err)
} else if len(ips) < 2 || !supportsIPv4 || !supportsIPv6 {
t.Skip("localhost doesn't have a pair of different address family IP addresses")
}
touchAndByeServer := func(dss *dualStackServer, ln Listener) {
for {
if c, err := ln.Accept(); err != nil {
return
} else {
c.Close()
}
}
}
dss, err := newDualStackServer([]streamListener{
{net: "tcp4", addr: "127.0.0.1"},
{net: "tcp6", addr: "[::1]"},
})
if err != nil {
t.Fatalf("newDualStackServer failed: %v", err)
}
defer dss.teardown()
if err := dss.buildup(touchAndByeServer); err != nil {
t.Fatalf("dualStackServer.buildup failed: %v", err)
}
d := &Dialer{DualStack: true}
for range dss.lns {
if c, err := d.Dial("tcp", "localhost:"+dss.port); err != nil {
t.Errorf("Dial failed: %v", err)
} else {
if addr := c.LocalAddr().(*TCPAddr); addr.IP.To4() != nil {
dss.teardownNetwork("tcp4")
} else if addr.IP.To16() != nil && addr.IP.To4() == nil {
dss.teardownNetwork("tcp6")
}
c.Close()
}
}
}
func TestDialerKeepAlive(t *testing.T) {
ln := newLocalListener(t)
defer ln.Close()
defer func() {
testHookSetKeepAlive = func() {}
}()
go func() {
for {
c, err := ln.Accept()
if err != nil {
return
}
c.Close()
}
}()
for _, keepAlive := range []bool{false, true} {
got := false
testHookSetKeepAlive = func() { got = true }
var d Dialer
if keepAlive {
d.KeepAlive = 30 * time.Second
}
c, err := d.Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatal(err)
}
c.Close()
if got != keepAlive {
t.Errorf("Dialer.KeepAlive = %v: SetKeepAlive called = %v, want %v", d.KeepAlive, got, !got)
}
}
}