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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package wgcfg
import (
"bufio"
"bytes"
"io"
"net/netip"
"os"
"sort"
"strings"
"sync"
"testing"
"github.com/tailscale/wireguard-go/conn"
"github.com/tailscale/wireguard-go/device"
"github.com/tailscale/wireguard-go/tun"
"go4.org/mem"
"tailscale.com/types/key"
)
func TestDeviceConfig(t *testing.T) {
newK := func() (key.NodePublic, key.NodePrivate) {
t.Helper()
k := key.NewNode()
return k.Public(), k
}
k1, pk1 := newK()
ip1 := netip.MustParsePrefix("10.0.0.1/32")
k2, pk2 := newK()
ip2 := netip.MustParsePrefix("10.0.0.2/32")
k3, _ := newK()
ip3 := netip.MustParsePrefix("10.0.0.3/32")
cfg1 := &Config{
PrivateKey: pk1,
Peers: []Peer{{
PublicKey: k2,
AllowedIPs: []netip.Prefix{ip2},
}},
}
cfg2 := &Config{
PrivateKey: pk2,
Peers: []Peer{{
PublicKey: k1,
AllowedIPs: []netip.Prefix{ip1},
PersistentKeepalive: 5,
}},
}
device1 := NewDevice(newNilTun(), new(noopBind), device.NewLogger(device.LogLevelError, "device1"))
device2 := NewDevice(newNilTun(), new(noopBind), device.NewLogger(device.LogLevelError, "device2"))
defer device1.Close()
defer device2.Close()
cmp := func(t *testing.T, d *device.Device, want *Config) {
t.Helper()
got, err := DeviceConfig(d)
if err != nil {
t.Fatal(err)
}
prev := new(Config)
gotbuf := new(strings.Builder)
err = got.ToUAPI(t.Logf, gotbuf, prev)
gotStr := gotbuf.String()
if err != nil {
t.Errorf("got.ToUAPI(): error: %v", err)
return
}
wantbuf := new(strings.Builder)
err = want.ToUAPI(t.Logf, wantbuf, prev)
wantStr := wantbuf.String()
if err != nil {
t.Errorf("want.ToUAPI(): error: %v", err)
return
}
if gotStr != wantStr {
buf := new(bytes.Buffer)
w := bufio.NewWriter(buf)
if err := d.IpcGetOperation(w); err != nil {
t.Errorf("on error, could not IpcGetOperation: %v", err)
}
w.Flush()
t.Errorf("config mismatch:\n---- got:\n%s\n---- want:\n%s\n---- uapi:\n%s", gotStr, wantStr, buf.String())
}
}
t.Run("device1-config", func(t *testing.T) {
if err := ReconfigDevice(device1, cfg1, t.Logf); err != nil {
t.Fatal(err)
}
cmp(t, device1, cfg1)
})
t.Run("device2-config", func(t *testing.T) {
if err := ReconfigDevice(device2, cfg2, t.Logf); err != nil {
t.Fatal(err)
}
cmp(t, device2, cfg2)
})
// This is only to test that Config and Reconfig are properly synchronized.
t.Run("device2-config-reconfig", func(t *testing.T) {
var wg sync.WaitGroup
wg.Add(2)
go func() {
ReconfigDevice(device2, cfg2, t.Logf)
wg.Done()
}()
go func() {
DeviceConfig(device2)
wg.Done()
}()
wg.Wait()
})
t.Run("device1-modify-peer", func(t *testing.T) {
cfg1.Peers[0].DiscoKey = key.DiscoPublicFromRaw32(mem.B([]byte{0: 1, 31: 0}))
if err := ReconfigDevice(device1, cfg1, t.Logf); err != nil {
t.Fatal(err)
}
cmp(t, device1, cfg1)
})
t.Run("device1-replace-endpoint", func(t *testing.T) {
cfg1.Peers[0].DiscoKey = key.DiscoPublicFromRaw32(mem.B([]byte{0: 2, 31: 0}))
if err := ReconfigDevice(device1, cfg1, t.Logf); err != nil {
t.Fatal(err)
}
cmp(t, device1, cfg1)
})
t.Run("device1-add-new-peer", func(t *testing.T) {
cfg1.Peers = append(cfg1.Peers, Peer{
PublicKey: k3,
AllowedIPs: []netip.Prefix{ip3},
})
sort.Slice(cfg1.Peers, func(i, j int) bool {
return cfg1.Peers[i].PublicKey.Less(cfg1.Peers[j].PublicKey)
})
origCfg, err := DeviceConfig(device1)
if err != nil {
t.Fatal(err)
}
if err := ReconfigDevice(device1, cfg1, t.Logf); err != nil {
t.Fatal(err)
}
cmp(t, device1, cfg1)
newCfg, err := DeviceConfig(device1)
if err != nil {
t.Fatal(err)
}
peer0 := func(cfg *Config) Peer {
p, ok := cfg.PeerWithKey(k2)
if !ok {
t.Helper()
t.Fatal("failed to look up peer 2")
}
return p
}
peersEqual := func(p, q Peer) bool {
return p.PublicKey == q.PublicKey && p.DiscoKey == q.DiscoKey && p.PersistentKeepalive == q.PersistentKeepalive && cidrsEqual(p.AllowedIPs, q.AllowedIPs)
}
if !peersEqual(peer0(origCfg), peer0(newCfg)) {
t.Error("reconfig modified old peer")
}
})
t.Run("device1-remove-peer", func(t *testing.T) {
removeKey := cfg1.Peers[len(cfg1.Peers)-1].PublicKey
cfg1.Peers = cfg1.Peers[:len(cfg1.Peers)-1]
if err := ReconfigDevice(device1, cfg1, t.Logf); err != nil {
t.Fatal(err)
}
cmp(t, device1, cfg1)
newCfg, err := DeviceConfig(device1)
if err != nil {
t.Fatal(err)
}
_, ok := newCfg.PeerWithKey(removeKey)
if ok {
t.Error("reconfig failed to remove peer")
}
})
}
// TODO: replace with a loopback tunnel
type nilTun struct {
events chan tun.Event
closed chan struct{}
}
func newNilTun() tun.Device {
return &nilTun{
events: make(chan tun.Event),
closed: make(chan struct{}),
}
}
func (t *nilTun) File() *os.File { return nil }
func (t *nilTun) Flush() error { return nil }
func (t *nilTun) MTU() (int, error) { return 1420, nil }
func (t *nilTun) Name() (string, error) { return "niltun", nil }
func (t *nilTun) Events() <-chan tun.Event { return t.events }
func (t *nilTun) Read(data [][]byte, sizes []int, offset int) (int, error) {
<-t.closed
return 0, io.EOF
}
func (t *nilTun) Write(data [][]byte, offset int) (int, error) {
<-t.closed
return 0, io.EOF
}
func (t *nilTun) Close() error {
close(t.events)
close(t.closed)
return nil
}
func (t *nilTun) BatchSize() int { return 1 }
// A noopBind is a conn.Bind that does no actual binding work.
type noopBind struct{}
func (noopBind) Open(port uint16) (fns []conn.ReceiveFunc, actualPort uint16, err error) {
return nil, 1, nil
}
func (noopBind) Close() error { return nil }
func (noopBind) SetMark(mark uint32) error { return nil }
func (noopBind) Send(b [][]byte, ep conn.Endpoint, offset int) error { return nil }
func (noopBind) ParseEndpoint(s string) (conn.Endpoint, error) {
return dummyEndpoint(s), nil
}
func (noopBind) BatchSize() int { return 1 }
// A dummyEndpoint is a string holding the endpoint destination.
type dummyEndpoint string
func (e dummyEndpoint) ClearSrc() {}
func (e dummyEndpoint) SrcToString() string { return "" }
func (e dummyEndpoint) DstToString() string { return string(e) }
func (e dummyEndpoint) DstToBytes() []byte { return nil }
func (e dummyEndpoint) DstIP() netip.Addr { return netip.Addr{} }
func (dummyEndpoint) SrcIP() netip.Addr { return netip.Addr{} }
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