43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
package file
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import (
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"fmt"
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"log"
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"github.com/miekg/coredns/middleware"
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"github.com/miekg/dns"
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)
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// Notify will send notifies to all configured IP addresses.
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func (z *Zone) Notify() {
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go notify(z.name, z.TransferTo)
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}
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// notify sends notifies to the configured remote servers. It will try up to three times
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// before giving up on a specific remote. We will sequentially loop through "to"
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// until they all have replied (or have 3 failed attempts).
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func notify(zone string, to []string) error {
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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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for _, t := range to {
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if err := notifyAddr(c, m, t); err != nil {
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log.Printf("[ERROR] " + err.Error())
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} else {
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log.Printf("[INFO] Sent notify for zone %s to %s", zone, t)
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}
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}
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return nil
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}
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func notifyAddr(c *dns.Client, m *dns.Msg, s string) error {
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for i := 0; i < 3; i++ {
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ret, err := middleware.Exchange(c, m, s)
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if err == nil && ret.Rcode == dns.RcodeSuccess || ret.Rcode == dns.RcodeNotImplemented {
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return nil
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}
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}
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return fmt.Errorf("Failed to send notify for zone '%s' to '%s'", m.Question[0].Name, s)
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}
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