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main.go
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main.go
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// MIT License
// Copyright (c) (2020) Alok Parlikar <alok@parlikar.com>
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
)
type tailscaleCfg struct {
LoginName string
}
func main() {
login := flag.String("login", "", "Email address to connect with tailscale")
flag.Parse()
if *login == "" {
flag.Usage()
}
if os.Geteuid() != 0 {
log.Fatalf("please run this command as root (or with sudo)")
}
cfgPath := "/var/lib/tailscale/relay.conf"
data, err := ioutil.ReadFile(cfgPath)
if err != nil {
log.Fatalf("unable to read tailscale config: %v", err)
}
var cfg tailscaleCfg
err = json.Unmarshal(data, &cfg)
if err != nil {
log.Fatalf("unable to read tailscale configuration: %v", err)
}
// store this config in it's own copy. Overwrite if already exists.
err = ioutil.WriteFile(fmt.Sprintf("%s.%s", cfgPath, cfg.LoginName), data, 0644)
if err != nil {
log.Fatalf("unable to save config file for %s: %v", *login, err)
}
if *login == cfg.LoginName {
log.Printf("already running tailscale as %q", *login)
return
}
// check if a config file already exists for the given login.
loginCfgPath := fmt.Sprintf("%s.%s", cfgPath, *login)
data, err = ioutil.ReadFile(loginCfgPath)
if err != nil {
log.Fatalf("could not read config for %q: %v. please run tailscale-login first.", *login, err)
}
// now overwrite the main config file
err = ioutil.WriteFile(cfgPath, data, 0644)
if err != nil {
log.Fatalf("unable to write tailscale config file: %v", err)
}
// now restart the tailscale service
cmd := exec.Command("systemctl", "restart", "tailscale-relay")
err = cmd.Run()
if err != nil {
log.Fatal("unable to restart tailscale service: %v", err)
}
}