74 lines
2.0 KiB
Go
74 lines
2.0 KiB
Go
package updater
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import (
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"bufio"
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"bytes"
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"context"
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"fmt"
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"os/exec"
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"strings"
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"git.cryptic.systems/volker.raschek/dyndns-client/pkg/types"
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)
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type Updater interface {
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AddRecord(ctx context.Context, name string, ttl uint, recordType string, data string) error
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DeleteRecord(ctx context.Context, name string, recordType string) error
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PruneRecords(ctx context.Context, name string) error
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}
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type NSUpdate struct {
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server string
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tsigKey *types.TSIGKey
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}
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func (u *NSUpdate) AddRecord(ctx context.Context, name string, ttl uint, recordType string, data string) error {
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nsUpdateCmd := ""
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switch recordType {
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case "A", "AAAA":
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nsUpdateCmd = fmt.Sprintf("update add %v %v IN %v %v", name, ttl, recordType, data)
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case "TXT":
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nsUpdateCmd = fmt.Sprintf("update add %v %v IN %v \"%v\"", name, ttl, recordType, data)
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default:
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return fmt.Errorf("RecordType %v not supported", recordType)
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}
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return u.execute(ctx, nsUpdateCmd)
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}
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func (u *NSUpdate) DeleteRecord(ctx context.Context, name string, recordType string) error {
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nsUpdateCmd := fmt.Sprintf("update delete %v IN %v", name, recordType)
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return u.execute(ctx, nsUpdateCmd)
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}
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func (u *NSUpdate) execute(ctx context.Context, nsUpdateCmd string) error {
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body := fmt.Sprintf("server %v\n%v\nsend\nquit", u.server, nsUpdateCmd)
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errBuffer := new(bytes.Buffer)
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// #nosec G204
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cmd := exec.CommandContext(ctx, "nsupdate", "-y", fmt.Sprintf("%v:%v:%v", u.tsigKey.Algorithm, u.tsigKey.Name, u.tsigKey.Secret))
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// cmd.Stdout = os.Stdout
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cmd.Stderr = bufio.NewWriter(errBuffer)
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cmd.Stdin = strings.NewReader(body)
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err := cmd.Run()
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if err != nil {
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return fmt.Errorf("nsupdate error %w: %v", err, errBuffer.String())
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}
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return nil
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}
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func (u *NSUpdate) PruneRecords(ctx context.Context, name string) error {
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nsUpdateCmd := fmt.Sprintf("update delete %v", name)
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return u.execute(ctx, nsUpdateCmd)
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}
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func NewNSUpdate(server string, tsigKey *types.TSIGKey) (Updater, error) {
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return &NSUpdate{
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server: server,
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tsigKey: tsigKey,
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}, nil
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}
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