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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package wgcfg
import (
"io"
"net/netip"
"os"
"testing"
"github.com/tailscale/wireguard-go/conn"
"github.com/tailscale/wireguard-go/device"
"github.com/tailscale/wireguard-go/tun"
"tailscale.com/types/key"
)
func TestReconfigDevice(t *testing.T) {
k1, pk1 := newK()
ip1 := netip.MustParsePrefix("10.0.0.1/32")
k2, _ := 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}},
},
}
dev := NewDevice(newNilTun(), new(noopBind), device.NewLogger(device.LogLevelError, "test"))
defer dev.Close()
t.Run("initial-config", func(t *testing.T) {
if err := ReconfigDevice(dev, cfg1, t.Logf); err != nil {
t.Fatal(err)
}
// Peer should be creatable on demand via LookupPeer.
peer := dev.LookupPeer(k2.Raw32())
if peer == nil {
t.Fatal("expected peer k2 to exist via LookupPeer")
}
// Unknown peer should not be found.
peer = dev.LookupPeer(k3.Raw32())
if peer != nil {
t.Fatal("expected unknown peer k3 to not exist")
}
})
t.Run("add-peer", func(t *testing.T) {
cfg1.Peers = append(cfg1.Peers, Peer{
PublicKey: k3,
AllowedIPs: []netip.Prefix{ip3},
})
if err := ReconfigDevice(dev, cfg1, t.Logf); err != nil {
t.Fatal(err)
}
// Both peers should now be discoverable.
if p := dev.LookupPeer(k2.Raw32()); p == nil {
t.Fatal("expected peer k2 to exist")
}
if p := dev.LookupPeer(k3.Raw32()); p == nil {
t.Fatal("expected peer k3 to exist")
}
})
t.Run("remove-peer", func(t *testing.T) {
cfg2 := &Config{
PrivateKey: pk1,
Peers: []Peer{
{PublicKey: k2, AllowedIPs: []netip.Prefix{ip2}},
},
}
if err := ReconfigDevice(dev, cfg2, t.Logf); err != nil {
t.Fatal(err)
}
// k2 should still be discoverable.
if p := dev.LookupPeer(k2.Raw32()); p == nil {
t.Fatal("expected peer k2 to exist")
}
// k3 should no longer be discoverable.
if p := dev.LookupPeer(k3.Raw32()); p != nil {
t.Fatal("expected peer k3 to not exist after removal")
}
})
t.Run("self-key-not-peer", func(t *testing.T) {
// The device's own key should not be a peer.
if p := dev.LookupPeer(k1.Raw32()); p != nil {
t.Fatal("expected own key to not be a peer")
}
})
_ = ip1 // suppress unused
}
func newK() (key.NodePublic, key.NodePrivate) {
k := key.NewNode()
return k.Public(), k
}
// 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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