func (dyndns *Dyndns) GetResourceRecordSet(record string) string {
svc := dyndns.getRoute53Client()
params := &route53.ListResourceRecordSetsInput{
HostedZoneId: aws.String(dyndns.Config.ZoneId),
MaxItems: aws.String("20"),
StartRecordIdentifier: aws.String("ResourceRecordSetIdentifier"),
StartRecordName: aws.String("DNSName"),
StartRecordType: aws.String("A"),
}
resp, err := svc.ListResourceRecordSets(params)
utils.CheckErr(err)
var recordResp *route53.ResourceRecordSet
for _, rr := range resp.ResourceRecordSets {
if aws.StringValue(rr.Type) != "A" {
continue
}
rrName := aws.StringValue(rr.Name)
rrName = strings.TrimSuffix(rrName, ".")
if record == rrName {
recordResp = rr
break
}
}
ip := *recordResp.ResourceRecords[0].Value
return fmt.Sprintf("%s", ip)
}
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))
}
func (dyndns *Dyndns) GetHostedZone() {
svc := dyndns.getRoute53Client()
params := &route53.GetHostedZoneInput{
Id: aws.String(dyndns.Config.ZoneId),
}
resp, err := svc.GetHostedZone(params)
utils.CheckErr(err)
log.Printf(resp.String())
}
func (dyndns *Dyndns) GetHostedZonesCount() {
log.Printf("hello world")
svc := dyndns.getRoute53Client()
var params *route53.GetHostedZoneCountInput
resp, err := svc.GetHostedZoneCount(params)
utils.CheckErr(err)
log.Printf("Zones: %d", *resp.HostedZoneCount)
}
func (dyndns *Dyndns) UpsertDomain(domain string, ip string) {
svc := dyndns.getRoute53Client()
existingIp := dyndns.GetResourceRecordSet(domain)
if existingIp == ip {
log.Printf("existing IP is already set to %s", ip)
return
}
log.Printf("updating %s with IP %s", domain, ip)
params := &route53.ChangeResourceRecordSetsInput{
ChangeBatch: &route53.ChangeBatch{
Changes: []*route53.Change{
{
Action: aws.String(route53.ChangeActionUpsert),
ResourceRecordSet: &route53.ResourceRecordSet{
Name: aws.String(domain),
Type: aws.String(route53.RRTypeA),
ResourceRecords: []*route53.ResourceRecord{
{
Value: aws.String(ip),
},
},
TTL: aws.Int64(60),
},
},
},
Comment: aws.String("Updated by r53dyndns"),
},
HostedZoneId: aws.String(dyndns.Config.ZoneId),
}
resp, err := svc.ChangeResourceRecordSets(params)
utils.CheckErr(err)
log.Println(resp)
// force a log entry
log.SetOutput(os.Stdout)
log.Printf("external IP for %s changed from %s to %s", domain, existingIp, ip)
}