86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"log"
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"net"
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"net/http"
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"os"
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"time"
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)
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type conf struct {
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zone string
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token string
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server string
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}
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func main() {
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conf, err := readConfigVars()
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if err != nil {
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log.Fatal(err)
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}
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lastIPv6 := ""
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for {
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time.Sleep(1 * time.Second)
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if newIPv6, ok := checkForNewV6(lastIPv6); ok {
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lastIPv6 = newIPv6
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sendNewIP(conf)
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}
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}
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}
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func checkForNewV6(lastIPv6 string) (string, bool) {
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interfaces, err := net.Interfaces()
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if err != nil {
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log.Println(err)
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return lastIPv6, false
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}
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currentIPv6 := ""
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for _, inter := range interfaces {
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addresses, err := inter.Addrs()
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if err != nil {
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log.Println(err)
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return lastIPv6, false
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}
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for _, addr := range addresses {
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if ip, ok := addr.(*net.IPNet); ok && !ip.IP.IsLoopback() {
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if ip.IP.To4() == nil {
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currentIPv6 = ip.IP.String()
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}
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}
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}
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}
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if currentIPv6 != lastIPv6 {
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return currentIPv6, true
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}
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return lastIPv6, false
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}
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func sendNewIP(config conf) error {
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_, err := http.Get(fmt.Sprintf("https://ipv6.dynv6.com/api/update?ipv6prefix=auto&token=%s&zone=%s", config.token, config.zone))
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if err != nil {
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return err
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}
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return nil
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}
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func readConfigVars() (conf, error) {
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var zone, token, server string
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var present bool
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if zone, present = os.LookupEnv("ZONE"); !present {
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return conf{}, errors.New("No Zone Specified")
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}
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if token, present = os.LookupEnv("TOKEN"); !present {
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return conf{}, errors.New("No Token Specified")
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}
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if server, present = os.LookupEnv("SERVER"); !present {
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server = "ipv6.dynv6.com"
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}
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return conf{
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zone: zone,
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token: token,
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server: server,
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}, nil
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}
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