170 lines
2.7 KiB
Go
170 lines
2.7 KiB
Go
package main
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import (
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"fmt"
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"os"
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"os/signal"
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"runtime"
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"strconv"
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)
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const (
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EnvWGTunFD = "WG_TUN_FD"
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)
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func printUsage() {
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fmt.Printf("usage:\n")
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fmt.Printf("%s [-f/--foreground] INTERFACE-NAME\n", os.Args[0])
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}
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func main() {
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// parse arguments
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var foreground bool
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var interfaceName string
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if len(os.Args) < 2 || len(os.Args) > 3 {
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printUsage()
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return
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}
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switch os.Args[1] {
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case "-f", "--foreground":
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foreground = true
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if len(os.Args) != 3 {
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printUsage()
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return
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}
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interfaceName = os.Args[2]
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default:
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foreground = false
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if len(os.Args) != 2 {
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printUsage()
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return
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}
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interfaceName = os.Args[1]
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}
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// get log level (default: info)
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logLevel := func() int {
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switch os.Getenv("LOG_LEVEL") {
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case "debug":
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return LogLevelDebug
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case "info":
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return LogLevelInfo
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case "error":
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return LogLevelError
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}
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return LogLevelInfo
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}()
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logger := NewLogger(
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logLevel,
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fmt.Sprintf("(%s) ", interfaceName),
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)
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logger.Debug.Println("Debug log enabled")
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// open TUN device
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tun, err := func() (TUNDevice, error) {
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tunFdStr := os.Getenv(EnvWGTunFD)
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if tunFdStr == "" {
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return CreateTUN(interfaceName)
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}
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// construct tun device from supplied FD
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fd, err := strconv.ParseUint(tunFdStr, 10, 32)
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if err != nil {
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return nil, err
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}
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file := os.NewFile(uintptr(fd), "/dev/net/tun")
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return CreateTUNFromFile(interfaceName, file)
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}()
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if err != nil {
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logger.Error.Println("Failed to create TUN device:", err)
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}
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// daemonize the process
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if !foreground {
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env := os.Environ()
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_, ok := os.LookupEnv(EnvWGTunFD)
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if !ok {
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kvp := fmt.Sprintf("%s=3", EnvWGTunFD)
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env = append(env, kvp)
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}
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attr := &os.ProcAttr{
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Files: []*os.File{
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nil, // stdin
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nil, // stdout
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nil, // stderr
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tun.File(),
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},
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Dir: ".",
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Env: env,
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}
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err = Daemonize(attr)
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if err != nil {
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logger.Error.Println("Failed to daemonize:", err)
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}
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return
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}
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// increase number of go workers (for Go <1.5)
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runtime.GOMAXPROCS(runtime.NumCPU())
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// create wireguard device
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device := NewDevice(tun, logger)
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logger.Info.Println("Device started")
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// start configuration lister
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uapi, err := NewUAPIListener(interfaceName)
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if err != nil {
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logger.Error.Println("UAPI listen error:", err)
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return
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}
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errs := make(chan error)
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term := make(chan os.Signal)
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wait := device.WaitChannel()
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go func() {
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for {
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conn, err := uapi.Accept()
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if err != nil {
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errs <- err
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return
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}
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go ipcHandle(device, conn)
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}
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}()
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logger.Info.Println("UAPI listener started")
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// wait for program to terminate
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signal.Notify(term, os.Kill)
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signal.Notify(term, os.Interrupt)
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select {
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case <-wait:
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case <-term:
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case <-errs:
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}
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// clean up UAPI bind
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uapi.Close()
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logger.Info.Println("Shutting down")
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}
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