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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package chirp
import (
"bufio"
"errors"
"fmt"
"net"
"os"
"path/filepath"
"strings"
"sync"
"testing"
"time"
)
type fakeBIRD struct {
net.Listener
protocolsEnabled map[string]bool
sock string
}
func newFakeBIRD(t *testing.T, protocols ...string) *fakeBIRD {
sock := filepath.Join(t.TempDir(), "sock")
ln, err := net.Listen("unix", sock)
if err != nil {
t.Fatal(err)
}
pe := make(map[string]bool)
for _, p := range protocols {
pe[p] = false
}
return &fakeBIRD{
Listener: ln,
protocolsEnabled: pe,
sock: sock,
}
}
func (fb *fakeBIRD) listen() error {
for {
c, err := fb.Accept()
if err != nil {
if errors.Is(err, net.ErrClosed) {
return nil
}
return err
}
go fb.handle(c)
}
}
func (fb *fakeBIRD) handle(c net.Conn) {
fmt.Fprintln(c, "0001 BIRD 2.0.8 ready.")
sc := bufio.NewScanner(c)
for sc.Scan() {
cmd := sc.Text()
args := strings.Split(cmd, " ")
switch args[0] {
case "enable":
en, ok := fb.protocolsEnabled[args[1]]
if !ok {
fmt.Fprintln(c, "9001 syntax error, unexpected CF_SYM_UNDEFINED, expecting CF_SYM_KNOWN or TEXT or ALL")
} else if en {
fmt.Fprintf(c, "0010-%s: already enabled\n", args[1])
} else {
fmt.Fprintf(c, "0011-%s: enabled\n", args[1])
}
fmt.Fprintln(c, "0000 ")
fb.protocolsEnabled[args[1]] = true
case "disable":
en, ok := fb.protocolsEnabled[args[1]]
if !ok {
fmt.Fprintln(c, "9001 syntax error, unexpected CF_SYM_UNDEFINED, expecting CF_SYM_KNOWN or TEXT or ALL")
} else if !en {
fmt.Fprintf(c, "0008-%s: already disabled\n", args[1])
} else {
fmt.Fprintf(c, "0009-%s: disabled\n", args[1])
}
fmt.Fprintln(c, "0000 ")
fb.protocolsEnabled[args[1]] = false
}
}
}
func TestChirp(t *testing.T) {
fb := newFakeBIRD(t, "tailscale")
defer fb.Close()
go fb.listen()
c, err := New(fb.sock)
if err != nil {
t.Fatal(err)
}
if err := c.EnableProtocol("tailscale"); err != nil {
t.Fatal(err)
}
if err := c.EnableProtocol("tailscale"); err != nil {
t.Fatal(err)
}
if err := c.DisableProtocol("tailscale"); err != nil {
t.Fatal(err)
}
if err := c.DisableProtocol("tailscale"); err != nil {
t.Fatal(err)
}
if err := c.EnableProtocol("rando"); err == nil {
t.Fatalf("enabling %q succeeded", "rando")
}
if err := c.DisableProtocol("rando"); err == nil {
t.Fatalf("disabling %q succeeded", "rando")
}
}
type hangingListener struct {
net.Listener
t *testing.T
done chan struct{}
wg sync.WaitGroup
sock string
}
func newHangingListener(t *testing.T) *hangingListener {
sock := filepath.Join(t.TempDir(), "sock")
ln, err := net.Listen("unix", sock)
if err != nil {
t.Fatal(err)
}
return &hangingListener{
Listener: ln,
t: t,
done: make(chan struct{}),
sock: sock,
}
}
func (hl *hangingListener) Stop() {
hl.Close()
close(hl.done)
hl.wg.Wait()
}
func (hl *hangingListener) listen() error {
for {
c, err := hl.Accept()
if err != nil {
if errors.Is(err, net.ErrClosed) {
return nil
}
return err
}
hl.wg.Add(1)
go hl.handle(c)
}
}
func (hl *hangingListener) handle(c net.Conn) {
defer hl.wg.Done()
// Write our fake first line of response so that we get into the read loop
fmt.Fprintln(c, "0001 BIRD 2.0.8 ready.")
ticker := time.NewTicker(2 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
hl.t.Logf("connection still hanging")
case <-hl.done:
return
}
}
}
func TestChirpTimeout(t *testing.T) {
fb := newHangingListener(t)
defer fb.Stop()
go fb.listen()
c, err := newWithTimeout(fb.sock, 500*time.Millisecond)
if err != nil {
t.Fatal(err)
}
err = c.EnableProtocol("tailscale")
if err == nil {
t.Fatal("got err=nil, want timeout")
}
if !os.IsTimeout(err) {
t.Fatalf("got err=%v, want os.IsTimeout(err)=true", err)
}
}
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