82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
package tlstunnel
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import (
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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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"github.com/caddyserver/certmagic"
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"github.com/libdns/libdns"
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)
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type commandDNSProvider struct {
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Name string
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Params []string
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}
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var _ certmagic.ACMEDNSProvider = (*commandDNSProvider)(nil)
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func (provider *commandDNSProvider) exec(ctx context.Context, subcmd string, subargs ...string) error {
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var params []string
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params = append(params, provider.Params...)
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params = append(params, subcmd)
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params = append(params, subargs...)
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cmd := exec.CommandContext(ctx, provider.Name, params...)
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if out, err := cmd.CombinedOutput(); err != nil {
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details := ""
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if len(out) > 0 {
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details = ": " + string(out)
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}
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return fmt.Errorf("failed to run DNS hook %v (%w)%v", subcmd, err, details)
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}
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return nil
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}
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func (provider *commandDNSProvider) processRecords(ctx context.Context, zone string, recs []libdns.Record, subcmd string) ([]libdns.Record, error) {
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var (
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done []libdns.Record
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err error
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)
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for _, rec := range recs {
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var domain string
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if domain, err = domainFromACMEChallengeRecord(zone, &rec); err != nil {
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break
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}
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if err = provider.exec(ctx, subcmd, domain, "-", rec.Value); err != nil {
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break
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}
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done = append(done, rec)
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}
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return done, err
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}
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func (provider *commandDNSProvider) AppendRecords(ctx context.Context, zone string, recs []libdns.Record) ([]libdns.Record, error) {
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return provider.processRecords(ctx, zone, recs, "deploy_challenge")
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}
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func (provider *commandDNSProvider) DeleteRecords(ctx context.Context, zone string, recs []libdns.Record) ([]libdns.Record, error) {
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return provider.processRecords(ctx, zone, recs, "clean_challenge")
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}
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func domainFromACMEChallengeRecord(zone string, rec *libdns.Record) (string, error) {
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relZone := strings.TrimSuffix(zone, ".")
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var domain string
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if rec.Name == "_acme-challenge" {
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// Root domain
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domain = relZone
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} else if strings.HasPrefix(rec.Name, "_acme-challenge.") {
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// Subdomain
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relName := strings.TrimPrefix(rec.Name, "_acme-challenge.")
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domain = relName + "." + relZone
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}
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if rec.Type != "TXT" || domain == "" {
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return "", fmt.Errorf("DNS record doesn't look like an ACME challenge: %v %v", rec.Type, rec.Name)
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}
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return domain, nil
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}
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