tailscale/chirp/chirp_test.go

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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package chirp
import (
"bufio"
"errors"
"fmt"
"net"
"path/filepath"
"strings"
"testing"
)
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")
l, 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: l,
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 succeded", "rando")
}
if err := c.DisableProtocol("rando"); err == nil {
t.Fatalf("disabling %q succeded", "rando")
}
}