func LoadConfig(configFile string) *Config {
// expand tilde to users home dir
if strings.HasPrefix(configFile, "~") {
u, _ := user.Current()
configFile = strings.Replace(configFile, "~", u.HomeDir, 1)
}
log.Printf("config file is %s", configFile)
// make sure the config file actually exists
if _, err := os.Stat(configFile); os.IsNotExist(err) {
utils.Fatalf("Error: couldn't load config from %s\n\n"+
"If you haven't configured r53dyndns yet, place a "+
"file that looks like this in ~/.r53dyndns:\n\n%s",
configFile, SampleConfig())
}
// load config
file, _ := os.Open(configFile)
decoder := json.NewDecoder(file)
config := Config{}
if err := decoder.Decode(&config); err != nil {
utils.Fatalf("error: %s", err)
}
// pre-flight check
utils.CheckErr(config.PreFlight())
return &config
}
func main() {
start_time := time.Now()
var ip string
flag.Parse()
if *domain == "" {
utils.Fatalf("Error: please supply the domain to update. Use -h for help.")
}
if !*verbose {
log.SetOutput(ioutil.Discard)
}
log.Printf("starting Route 53 DNS update for %s", *domain)
conf := config.LoadConfig(*configFile)
r53 := dyndns.Dyndns{Config: conf}
switch {
case *staticIp != "":
ip = *staticIp
if !utils.ValidIP(ip) {
utils.Fatalf("Error: %s is not a valid IP", ip)
}
case *interfaceIp != "":
var err error
ip, err = utils.GetInterfaceIP(*interfaceIp)
utils.CheckErr(err)
case *autoDetect:
var err error
ip, err = utils.GetExternalIP()
utils.CheckErr(err)
default:
utils.Fatalf("Error: please supply one of -s, -a, -i. Use -h for help.")
}
// update record
// XXX: only if it changed from the last run
r53.UpsertDomain(*domain, ip)
log.Printf("done - took %s", time.Since(start_time))
}