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merlin.go
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merlin.go
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package merlin
import (
"bytes"
"fmt"
"os"
"os/exec"
"strings"
"time"
"unicode"
"github.com/kardianos/service"
"github.com/Control-D-Inc/ctrld"
"github.com/Control-D-Inc/ctrld/internal/router/dnsmasq"
"github.com/Control-D-Inc/ctrld/internal/router/ntp"
"github.com/Control-D-Inc/ctrld/internal/router/nvram"
)
const Name = "merlin"
var nvramKvMap = map[string]string{
"dnspriv_enable": "0", // Ensure Merlin native DoT disabled.
}
type Merlin struct {
cfg *ctrld.Config
}
// New returns a router.Router for configuring/setup/run ctrld on Merlin routers.
func New(cfg *ctrld.Config) *Merlin {
return &Merlin{cfg: cfg}
}
func (m *Merlin) ConfigureService(config *service.Config) error {
return nil
}
func (m *Merlin) Install(_ *service.Config) error {
return nil
}
func (m *Merlin) Uninstall(_ *service.Config) error {
return nil
}
func (m *Merlin) PreRun() error {
// Wait NTP ready.
_ = m.Cleanup()
if err := ntp.WaitNvram(); err != nil {
return err
}
// Wait until directories mounted.
for _, dir := range []string{"/tmp", "/proc"} {
waitDirExists(dir)
}
// Wait dnsmasq started.
for {
out, _ := exec.Command("pidof", "dnsmasq").CombinedOutput()
if len(bytes.TrimSpace(out)) > 0 {
break
}
time.Sleep(time.Second)
}
return nil
}
func (m *Merlin) Setup() error {
if m.cfg.FirstListener().IsDirectDnsListener() {
return nil
}
// Already setup.
if val, _ := nvram.Run("get", nvram.CtrldSetupKey); val == "1" {
return nil
}
buf, err := os.ReadFile(dnsmasq.MerlinPostConfPath)
// Already setup.
if bytes.Contains(buf, []byte(dnsmasq.MerlinPostConfMarker)) {
return nil
}
if err != nil && !os.IsNotExist(err) {
return err
}
data, err := dnsmasq.ConfTmpl(dnsmasq.MerlinPostConfTmpl, m.cfg)
if err != nil {
return err
}
data = strings.Join([]string{
data,
"\n",
dnsmasq.MerlinPostConfMarker,
"\n",
string(buf),
}, "\n")
// Write dnsmasq post conf file.
if err := os.WriteFile(dnsmasq.MerlinPostConfPath, []byte(data), 0750); err != nil {
return err
}
// Restart dnsmasq service.
if err := restartDNSMasq(); err != nil {
return err
}
if err := nvram.SetKV(nvramKvMap, nvram.CtrldSetupKey); err != nil {
return err
}
return nil
}
func (m *Merlin) Cleanup() error {
if m.cfg.FirstListener().IsDirectDnsListener() {
return nil
}
if val, _ := nvram.Run("get", nvram.CtrldSetupKey); val != "1" {
return nil // was restored, nothing to do.
}
// Restore old configs.
if err := nvram.Restore(nvramKvMap, nvram.CtrldSetupKey); err != nil {
return err
}
buf, err := os.ReadFile(dnsmasq.MerlinPostConfPath)
if err != nil && !os.IsNotExist(err) {
return err
}
// Restore dnsmasq post conf file.
if err := os.WriteFile(dnsmasq.MerlinPostConfPath, merlinParsePostConf(buf), 0750); err != nil {
return err
}
// Restart dnsmasq service.
if err := restartDNSMasq(); err != nil {
return err
}
return nil
}
func restartDNSMasq() error {
if out, err := exec.Command("service", "restart_dnsmasq").CombinedOutput(); err != nil {
return fmt.Errorf("restart_dnsmasq: %s, %w", string(out), err)
}
return nil
}
func merlinParsePostConf(buf []byte) []byte {
if len(buf) == 0 {
return nil
}
parts := bytes.Split(buf, []byte(dnsmasq.MerlinPostConfMarker))
if len(parts) != 1 {
return bytes.TrimLeftFunc(parts[1], unicode.IsSpace)
}
return buf
}
func waitDirExists(dir string) {
for {
if _, err := os.Stat(dir); !os.IsNotExist(err) {
return
}
time.Sleep(time.Second)
}
}