device: test up/down using virtual conn
This prevents port clashing bugs. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
6603c05a4a
commit
9a29ae267c
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@ -0,0 +1,136 @@
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
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*/
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package bindtest
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import (
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"fmt"
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"math/rand"
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"net"
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"os"
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"strconv"
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"golang.zx2c4.com/wireguard/conn"
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)
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type ChannelBind struct {
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rx4, tx4 *chan []byte
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rx6, tx6 *chan []byte
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closeSignal chan bool
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source4, source6 ChannelEndpoint
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target4, target6 ChannelEndpoint
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}
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type ChannelEndpoint uint16
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var _ conn.Bind = (*ChannelBind)(nil)
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var _ conn.Endpoint = (*ChannelEndpoint)(nil)
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func NewChannelBinds() [2]conn.Bind {
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arx4 := make(chan []byte, 8192)
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brx4 := make(chan []byte, 8192)
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arx6 := make(chan []byte, 8192)
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brx6 := make(chan []byte, 8192)
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var binds [2]ChannelBind
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binds[0].rx4 = &arx4
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binds[0].tx4 = &brx4
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binds[1].rx4 = &brx4
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binds[1].tx4 = &arx4
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binds[0].rx6 = &arx6
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binds[0].tx6 = &brx6
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binds[1].rx6 = &brx6
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binds[1].tx6 = &arx6
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binds[0].target4 = ChannelEndpoint(1)
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binds[1].target4 = ChannelEndpoint(2)
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binds[0].target6 = ChannelEndpoint(3)
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binds[1].target6 = ChannelEndpoint(4)
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binds[0].source4 = binds[1].target4
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binds[0].source6 = binds[1].target6
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binds[1].source4 = binds[0].target4
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binds[1].source6 = binds[0].target6
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return [2]conn.Bind{&binds[0], &binds[1]}
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}
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func (c ChannelEndpoint) ClearSrc() {}
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func (c ChannelEndpoint) SrcToString() string { return "" }
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func (c ChannelEndpoint) DstToString() string { return fmt.Sprintf("127.0.0.1:%d", c) }
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func (c ChannelEndpoint) DstToBytes() []byte { return []byte{byte(c)} }
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func (c ChannelEndpoint) DstIP() net.IP { return net.IPv4(127, 0, 0, 1) }
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func (c ChannelEndpoint) SrcIP() net.IP { return nil }
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func (c *ChannelBind) Open(port uint16) (actualPort uint16, err error) {
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c.closeSignal = make(chan bool)
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if rand.Uint32()&1 == 0 {
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return uint16(c.source4), nil
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} else {
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return uint16(c.source6), nil
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}
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}
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func (c *ChannelBind) Close() error {
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if c.closeSignal != nil {
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select {
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case <-c.closeSignal:
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default:
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close(c.closeSignal)
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}
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}
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return nil
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}
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func (c *ChannelBind) SetMark(mark uint32) error { return nil }
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func (c *ChannelBind) ReceiveIPv6(b []byte) (n int, ep conn.Endpoint, err error) {
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select {
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case <-c.closeSignal:
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return 0, nil, net.ErrClosed
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case rx := <-*c.rx6:
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return copy(b, rx), c.target6, nil
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}
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}
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func (c *ChannelBind) ReceiveIPv4(b []byte) (n int, ep conn.Endpoint, err error) {
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select {
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case <-c.closeSignal:
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return 0, nil, net.ErrClosed
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case rx := <-*c.rx4:
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return copy(b, rx), c.target4, nil
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}
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}
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func (c *ChannelBind) Send(b []byte, ep conn.Endpoint) error {
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select {
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case <-c.closeSignal:
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return net.ErrClosed
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default:
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bc := make([]byte, len(b))
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copy(bc, b)
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if ep.(ChannelEndpoint) == c.target4 {
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*c.tx4 <- bc
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} else if ep.(ChannelEndpoint) == c.target6 {
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*c.tx6 <- bc
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} else {
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return os.ErrInvalid
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}
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}
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return nil
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}
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func (c *ChannelBind) ParseEndpoint(s string) (conn.Endpoint, error) {
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_, port, err := net.SplitHostPort(s)
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if err != nil {
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return nil, err
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}
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i, err := strconv.ParseUint(port, 10, 16)
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if err != nil {
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return nil, err
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}
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return ChannelEndpoint(i), nil
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}
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@ -8,7 +8,6 @@ package device
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import (
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"bytes"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"math/rand"
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@ -17,11 +16,11 @@ import (
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"runtime/pprof"
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"sync"
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"sync/atomic"
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"syscall"
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"testing"
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"time"
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"golang.zx2c4.com/wireguard/conn"
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"golang.zx2c4.com/wireguard/conn/bindtest"
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"golang.zx2c4.com/wireguard/tun/tuntest"
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)
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@ -148,8 +147,14 @@ func (pair *testPair) Send(tb testing.TB, ping SendDirection, done chan struct{}
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}
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// genTestPair creates a testPair.
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func genTestPair(tb testing.TB) (pair testPair) {
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func genTestPair(tb testing.TB, realSocket bool) (pair testPair) {
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cfg, endpointCfg := genConfigs(tb)
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var binds [2]conn.Bind
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if realSocket {
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binds[0], binds[1] = conn.NewDefaultBind(), conn.NewDefaultBind()
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} else {
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binds = bindtest.NewChannelBinds()
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}
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// Bring up a ChannelTun for each config.
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for i := range pair {
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p := &pair[i]
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@ -159,7 +164,7 @@ func genTestPair(tb testing.TB) (pair testPair) {
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if _, ok := tb.(*testing.B); ok && !testing.Verbose() {
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level = LogLevelError
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}
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p.dev = NewDevice(p.tun.TUN(), conn.NewDefaultBind(), NewLogger(level, fmt.Sprintf("dev%d: ", i)))
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p.dev = NewDevice(p.tun.TUN(), binds[i], NewLogger(level, fmt.Sprintf("dev%d: ", i)))
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if err := p.dev.IpcSet(cfg[i]); err != nil {
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tb.Errorf("failed to configure device %d: %v", i, err)
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p.dev.Close()
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@ -187,7 +192,7 @@ func genTestPair(tb testing.TB) (pair testPair) {
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func TestTwoDevicePing(t *testing.T) {
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goroutineLeakCheck(t)
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pair := genTestPair(t)
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pair := genTestPair(t, true)
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t.Run("ping 1.0.0.1", func(t *testing.T) {
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pair.Send(t, Ping, nil)
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})
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@ -198,11 +203,11 @@ func TestTwoDevicePing(t *testing.T) {
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func TestUpDown(t *testing.T) {
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goroutineLeakCheck(t)
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const itrials = 20
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const otrials = 1
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const itrials = 50
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const otrials = 10
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for n := 0; n < otrials; n++ {
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pair := genTestPair(t)
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pair := genTestPair(t, false)
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for i := range pair {
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for k := range pair[i].dev.peers.keyMap {
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pair[i].dev.IpcSet(fmt.Sprintf("public_key=%s\npersistent_keepalive_interval=1\n", hex.EncodeToString(k[:])))
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@ -214,17 +219,8 @@ func TestUpDown(t *testing.T) {
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go func(d *Device) {
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defer wg.Done()
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for i := 0; i < itrials; i++ {
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start := time.Now()
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for {
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if err := d.Up(); err != nil {
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if errors.Is(err, syscall.EADDRINUSE) && time.Now().Sub(start) < time.Second*4 {
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// Some other test process is racing with us, so try again.
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time.Sleep(time.Millisecond * 10)
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continue
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}
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t.Errorf("failed up bring up device: %v", err)
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}
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break
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if err := d.Up(); err != nil {
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t.Errorf("failed up bring up device: %v", err)
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}
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time.Sleep(time.Duration(rand.Intn(int(time.Nanosecond * (0x10000 - 1)))))
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if err := d.Down(); err != nil {
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@ -245,7 +241,7 @@ func TestUpDown(t *testing.T) {
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// TestConcurrencySafety does other things concurrently with tunnel use.
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// It is intended to be used with the race detector to catch data races.
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func TestConcurrencySafety(t *testing.T) {
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pair := genTestPair(t)
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pair := genTestPair(t, true)
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done := make(chan struct{})
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const warmupIters = 10
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@ -315,7 +311,7 @@ func TestConcurrencySafety(t *testing.T) {
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}
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func BenchmarkLatency(b *testing.B) {
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pair := genTestPair(b)
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pair := genTestPair(b, true)
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// Establish a connection.
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pair.Send(b, Ping, nil)
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@ -329,7 +325,7 @@ func BenchmarkLatency(b *testing.B) {
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}
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func BenchmarkThroughput(b *testing.B) {
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pair := genTestPair(b)
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pair := genTestPair(b, true)
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// Establish a connection.
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pair.Send(b, Ping, nil)
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@ -373,7 +369,7 @@ func BenchmarkThroughput(b *testing.B) {
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}
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func BenchmarkUAPIGet(b *testing.B) {
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pair := genTestPair(b)
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pair := genTestPair(b, true)
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pair.Send(b, Ping, nil)
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pair.Send(b, Pong, nil)
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b.ReportAllocs()
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@ -79,7 +79,6 @@ func genICMPv4(payload []byte, dst, src net.IP) []byte {
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return pkt
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}
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// TODO(crawshaw): find a reusable home for this. package devicetest?
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type ChannelTUN struct {
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Inbound chan []byte // incoming packets, closed on TUN close
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Outbound chan []byte // outbound packets, blocks forever on TUN close
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