wireguard-go/main.go

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package main
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import (
"fmt"
"os"
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"os/signal"
"runtime"
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"strconv"
)
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const (
ExitSetupSuccess = 0
ExitSetupFailed = 1
)
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const (
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ENV_WG_TUN_FD = "WG_TUN_FD"
ENV_WG_UAPI_FD = "WG_UAPI_FD"
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)
func printUsage() {
fmt.Printf("usage:\n")
fmt.Printf("%s [-f/--foreground] INTERFACE-NAME\n", os.Args[0])
}
func main() {
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// parse arguments
var foreground bool
var interfaceName string
if len(os.Args) < 2 || len(os.Args) > 3 {
printUsage()
return
}
switch os.Args[1] {
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case "-f", "--foreground":
foreground = true
if len(os.Args) != 3 {
printUsage()
return
}
interfaceName = os.Args[2]
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default:
foreground = false
if len(os.Args) != 2 {
printUsage()
return
}
interfaceName = os.Args[1]
}
// get log level (default: info)
logLevel := func() int {
switch os.Getenv("LOG_LEVEL") {
case "debug":
return LogLevelDebug
case "info":
return LogLevelInfo
case "error":
return LogLevelError
}
return LogLevelInfo
}()
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logger := NewLogger(
logLevel,
fmt.Sprintf("(%s) ", interfaceName),
)
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logger.Debug.Println("Debug log enabled")
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// open TUN device (or use supplied fd)
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tun, err := func() (TUNDevice, error) {
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tunFdStr := os.Getenv(ENV_WG_TUN_FD)
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if tunFdStr == "" {
return CreateTUN(interfaceName)
}
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// construct tun device from supplied fd
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fd, err := strconv.ParseUint(tunFdStr, 10, 32)
if err != nil {
return nil, err
}
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file := os.NewFile(uintptr(fd), "")
return CreateTUNFromFile(file)
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}()
if err != nil {
logger.Error.Println("Failed to create TUN device:", err)
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os.Exit(ExitSetupFailed)
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}
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// open UAPI file (or use supplied fd)
fileUAPI, err := func() (*os.File, error) {
uapiFdStr := os.Getenv(ENV_WG_UAPI_FD)
if uapiFdStr == "" {
return UAPIOpen(interfaceName)
}
// use supplied fd
fd, err := strconv.ParseUint(uapiFdStr, 10, 32)
if err != nil {
return nil, err
}
return os.NewFile(uintptr(fd), ""), nil
}()
if err != nil {
logger.Error.Println("UAPI listen error:", err)
os.Exit(ExitSetupFailed)
return
}
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// daemonize the process
if !foreground {
env := os.Environ()
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env = append(env, fmt.Sprintf("%s=3", ENV_WG_TUN_FD))
env = append(env, fmt.Sprintf("%s=4", ENV_WG_UAPI_FD))
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attr := &os.ProcAttr{
Files: []*os.File{
nil, // stdin
nil, // stdout
nil, // stderr
tun.File(),
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fileUAPI,
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},
Dir: ".",
Env: env,
}
err = Daemonize(attr)
if err != nil {
logger.Error.Println("Failed to daemonize:", err)
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os.Exit(ExitSetupFailed)
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}
return
}
// increase number of go workers (for Go <1.5)
runtime.GOMAXPROCS(runtime.NumCPU())
// create wireguard device
device := NewDevice(tun, logger)
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logger.Info.Println("Device started")
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// start uapi listener
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errs := make(chan error)
term := make(chan os.Signal)
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uapi, err := UAPIListen(interfaceName, fileUAPI)
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go func() {
for {
conn, err := uapi.Accept()
if err != nil {
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errs <- err
return
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}
go ipcHandle(device, conn)
}
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}()
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logger.Info.Println("UAPI listener started")
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// wait for program to terminate
signal.Notify(term, os.Kill)
signal.Notify(term, os.Interrupt)
select {
case <-term:
case <-errs:
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case <-device.Wait():
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}
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// clean up
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uapi.Close()
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device.Close()
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logger.Info.Println("Shutting down")
}