86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
package nswrapper
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import (
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"bufio"
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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)
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// UpdateRecord builds a nsupdate file and updates a record by executing it with nsupdate.
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func UpdateRecord(hostname string, target string, addrType string, zone string, ttl int) error {
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fmt.Printf("%s record update request: %s -> %s\n", addrType, hostname, target)
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f, err := ioutil.TempFile(os.TempDir(), "dyndns")
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if err != nil {
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return err
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}
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defer os.Remove(f.Name())
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w := bufio.NewWriter(f)
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w.WriteString(fmt.Sprintf("server %s\n", "localhost"))
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w.WriteString(fmt.Sprintf("zone %s\n", zone))
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w.WriteString(fmt.Sprintf("update delete %s.%s %s\n", hostname, zone, addrType))
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w.WriteString(fmt.Sprintf("update add %s.%s %v %s %s\n", hostname, zone, ttl, addrType, target))
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w.WriteString("send\n")
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w.Flush()
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f.Close()
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cmd := exec.Command("/usr/bin/nsupdate", f.Name())
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var out bytes.Buffer
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var stderr bytes.Buffer
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cmd.Stdout = &out
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cmd.Stderr = &stderr
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err = cmd.Run()
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if err != nil {
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return fmt.Errorf("%v: %v", err, stderr.String())
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}
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if out.String() != "" {
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return fmt.Errorf(out.String())
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}
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return nil
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}
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// DeleteRecord builds a nsupdate file and deletes a record by executing it with nsupdate.
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func DeleteRecord(hostname string, zone string) error {
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fmt.Printf("record delete request: %s\n", hostname)
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f, err := ioutil.TempFile(os.TempDir(), "dyndns")
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if err != nil {
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return err
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}
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defer os.Remove(f.Name())
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w := bufio.NewWriter(f)
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w.WriteString(fmt.Sprintf("server %s\n", "localhost"))
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w.WriteString(fmt.Sprintf("zone %s\n", zone))
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w.WriteString(fmt.Sprintf("update delete %s.%s\n", hostname, zone))
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w.WriteString("send\n")
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w.Flush()
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f.Close()
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cmd := exec.Command("/usr/bin/nsupdate", f.Name())
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var out bytes.Buffer
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var stderr bytes.Buffer
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cmd.Stdout = &out
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cmd.Stderr = &stderr
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err = cmd.Run()
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if err != nil {
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return fmt.Errorf("%v: %v", err, stderr.String())
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}
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if out.String() != "" {
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return fmt.Errorf(out.String())
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}
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return nil
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}
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