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// dyndns is a dual-stack DynDNS client that uses the INWX JSON-RPC API.
package main
import (
"flag"
"net"
"github.com/HimbeerserverDE/inwx"
)
func main() {
const usage = "override the default config path"
configFile := flag.String("config", "/etc/dyndns.conf", usage)
conf := &config{}
if err := conf.parse(*configFile); err != nil {
logger.Fatal(err)
}
update4 := make(chan *net.IPAddr)
update6 := make(chan *net.IPNet)
go monitor4(conf, update4)
go monitor6(conf, update6)
for {
select {
case newAddr := <-update4:
if err := nsUpdate4(conf, newAddr); err != nil {
logger.Print(err)
}
case newPrefix := <-update6:
if err := nsUpdate6(conf, newPrefix); err != nil {
logger.Print(err)
}
}
}
}
func updateRecords(c *inwx.Client, ids []int, content string) error {
_, err := c.Call(&inwx.NSUpdateRecordsCall{
IDs: ids,
RecordInfo: inwx.RecordInfo{
Content: content,
},
})
return err
}
func nsUpdate4(conf *config, addr *net.IPAddr) error {
clt, err := inwx.Login(inwx.Production, conf.User, conf.Passwd)
if err != nil {
return err
}
defer clt.Close()
return updateRecords(clt, conf.Records4, addr.String())
}
func nsUpdate6(conf *config, prefix *net.IPNet) error {
clt, err := inwx.Login(inwx.Production, conf.User, conf.Passwd)
if err != nil {
return err
}
defer clt.Close()
for _, id := range conf.Records6 {
resp, err := clt.Call(&inwx.NSRecordInfoCall{
RecordID: id,
Type: "AAAA",
})
if err != nil {
logger.Printf("can't get info, skipping IPv6 record %d: %v", id, err)
continue
}
record := &inwx.NSRecordInfoResponse{}
if err := resp.Into(record); err != nil {
logger.Printf("IPv6 record response is invalid: %v", err)
continue
}
if n := len(record.Records); n != 1 {
logger.Printf("invalid number of IPv6 records: %d != 1", n)
continue
}
addr := net.ParseIP(record.Records[0].Content)
if addr == nil {
logger.Printf("invalid IPv6 record %d: %s", id, record.Records[0].Content)
continue
}
ifidMask := net.CIDRMask(conf.PrefixLen, 128)
for k, v := range ifidMask {
ifidMask[k] = ^v
}
ifid := addr.Mask(ifidMask)
newAddr := prefix.IP
for k, v := range newAddr {
newAddr[k] = v | ifid[k]
}
if err := updateRecords(clt, []int{id}, newAddr.String()); err != nil {
logger.Printf("can't update, skipping IPv6 record %d: %v", id, err)
continue
}
}
return nil
}
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