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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2020 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"bytes"
"fmt"
"io"
"net"
"testing"
"time"
"golang.zx2c4.com/wireguard/tun/tuntest"
)
func getFreePort(t *testing.T) string {
l, err := net.ListenPacket("udp", "localhost:0")
if err != nil {
t.Fatal(err)
}
defer l.Close()
return fmt.Sprintf("%d", l.LocalAddr().(*net.UDPAddr).Port)
}
// uapiCfg returns a reader that contains cfg formatted use with IpcSetOperation.
// cfg is a series of alternating key/value strings.
// uapiCfg exists because editors and humans like to insert
// whitespace into configs, which can cause failures, some of which are silent.
// For example, a leading blank newline causes the remainder
// of the config to be silently ignored.
func uapiCfg(cfg ...string) io.ReadSeeker {
if len(cfg)%2 != 0 {
panic("odd number of args to uapiReader")
}
buf := new(bytes.Buffer)
for i, s := range cfg {
buf.WriteString(s)
sep := byte('\n')
if i%2 == 0 {
sep = '='
}
buf.WriteByte(sep)
}
return bytes.NewReader(buf.Bytes())
}
// genConfigs generates a pair of configs that connect to each other.
// The configs use distinct, probably-usable ports.
func genConfigs(t *testing.T) (cfgs [2]io.Reader) {
var port1, port2 string
for port1 == port2 {
port1 = getFreePort(t)
port2 = getFreePort(t)
}
cfgs[0] = uapiCfg(
"private_key", "481eb0d8113a4a5da532d2c3e9c14b53c8454b34ab109676f6b58c2245e37b58",
"listen_port", port1,
"replace_peers", "true",
"public_key", "f70dbb6b1b92a1dde1c783b297016af3f572fef13b0abb16a2623d89a58e9725",
"protocol_version", "1",
"replace_allowed_ips", "true",
"allowed_ip", "1.0.0.2/32",
"endpoint", "127.0.0.1:"+port2,
)
cfgs[1] = uapiCfg(
"private_key", "98c7989b1661a0d64fd6af3502000f87716b7c4bbcf00d04fc6073aa7b539768",
"listen_port", port2,
"replace_peers", "true",
"public_key", "49e80929259cebdda4f322d6d2b1a6fad819d603acd26fd5d845e7a123036427",
"protocol_version", "1",
"replace_allowed_ips", "true",
"allowed_ip", "1.0.0.1/32",
"endpoint", "127.0.0.1:"+port1,
)
return
}
// genChannelTUNs creates a usable pair of ChannelTUNs for use in a test.
func genChannelTUNs(t *testing.T) (tun [2]*tuntest.ChannelTUN) {
const maxAttempts = 10
NextAttempt:
for i := 0; i < maxAttempts; i++ {
cfg := genConfigs(t)
// Bring up a ChannelTun for each config.
for i := range tun {
tun[i] = tuntest.NewChannelTUN()
dev := NewDevice(tun[i].TUN(), NewLogger(LogLevelDebug, fmt.Sprintf("dev%d: ", i)))
dev.Up()
if err := dev.IpcSetOperation(cfg[i]); err != nil {
// genConfigs attempted to pick ports that were free.
// There's a tiny window between genConfigs closing the port
// and us opening it, during which another process could
// start using it. We probably just lost that race.
// Try again from the beginning.
// If there's something permanent wrong,
// we'll see that when we run out of attempts.
t.Logf("failed to configure device %d: %v", i, err)
continue NextAttempt
}
// The device might still not be up, e.g. due to an error
// in RoutineTUNEventReader's call to dev.Up that got swallowed.
// Assume it's due to a transient error (port in use), and retry.
if !dev.isUp.Get() {
t.Logf("%v did not come up, trying again", dev)
continue NextAttempt
}
// The device is up. Close it when the test completes.
t.Cleanup(dev.Close)
}
return // success
}
t.Fatalf("genChannelTUNs: failed %d times", maxAttempts)
return
}
func TestTwoDevicePing(t *testing.T) {
tun := genChannelTUNs(t)
t.Run("ping 1.0.0.1", func(t *testing.T) {
msg2to1 := tuntest.Ping(net.ParseIP("1.0.0.1"), net.ParseIP("1.0.0.2"))
tun[1].Outbound <- msg2to1
select {
case msgRecv := <-tun[0].Inbound:
if !bytes.Equal(msg2to1, msgRecv) {
t.Error("ping did not transit correctly")
}
case <-time.After(5 * time.Second):
t.Error("ping did not transit")
}
})
t.Run("ping 1.0.0.2", func(t *testing.T) {
msg1to2 := tuntest.Ping(net.ParseIP("1.0.0.2"), net.ParseIP("1.0.0.1"))
tun[0].Outbound <- msg1to2
select {
case msgRecv := <-tun[1].Inbound:
if !bytes.Equal(msg1to2, msgRecv) {
t.Error("return ping did not transit correctly")
}
case <-time.After(5 * time.Second):
t.Error("return ping did not transit")
}
})
}
func assertNil(t *testing.T, err error) {
if err != nil {
t.Fatal(err)
}
}
func assertEqual(t *testing.T, a, b []byte) {
if !bytes.Equal(a, b) {
t.Fatal(a, "!=", b)
}
}
func randDevice(t *testing.T) *Device {
sk, err := newPrivateKey()
if err != nil {
t.Fatal(err)
}
tun := newDummyTUN("dummy")
logger := NewLogger(LogLevelError, "")
device := NewDevice(tun, logger)
device.SetPrivateKey(sk)
return device
}
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