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19a6ae4983
Enable intrange linter to enforce modern Go range syntax over traditional for loops, by converting: for i := 0; i < n; i++ to: for i := range n Adding type conversions where needed for compatibility with existing uint64 parameters. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package transfer
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import (
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"fmt"
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"github.com/coredns/coredns/plugin/pkg/rcode"
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"github.com/miekg/dns"
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)
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// Notify will send notifies to all configured to hosts IP addresses. The string zone must be lowercased.
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func (t *Transfer) Notify(zone string) error {
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if t == nil { // t might be nil, mostly expected in tests, so intercept and to a noop in that case
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return nil
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}
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m := new(dns.Msg)
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m.SetNotify(zone)
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c := new(dns.Client)
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x := longestMatch(t.xfrs, zone)
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if x == nil {
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// return without error if there is no matching zone
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return nil
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}
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var err1 error
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for _, t := range x.to {
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if t == "*" {
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continue
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}
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if err := sendNotify(c, m, t); err != nil {
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err1 = err
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}
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}
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log.Debugf("Sent notifies for zone %q to %v", zone, x.to)
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return err1 // this only captures the last error
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}
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func sendNotify(c *dns.Client, m *dns.Msg, s string) error {
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var err error
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code := dns.RcodeServerFailure
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for range 3 {
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ret, _, err := c.Exchange(m, s)
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if err != nil {
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continue
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}
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code = ret.Rcode
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if code == dns.RcodeSuccess {
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return nil
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}
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}
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if err != nil {
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return fmt.Errorf("notify for zone %q was not accepted by %q: %q", m.Question[0].Name, s, err)
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}
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return fmt.Errorf("notify for zone %q was not accepted by %q: rcode was %q", m.Question[0].Name, s, rcode.ToString(code))
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}
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