39 lines
1.1 KiB
Go
39 lines
1.1 KiB
Go
package file
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import (
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"fmt"
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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.Peers)
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}
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// notify sends notifies to the configured remotes. It will try up to three times
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// before giving up on a specific remote. We will sequentially loop through the remotes
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// until they all have replied (or have 3 failed attempts).
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func notify(zone string, remotes []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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// TODO(miek): error handling? Run this in a goroutine?
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for _, remote := range remotes {
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notifyRemote(c, m, middleware.Addr(remote).Standard())
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}
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return nil
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}
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func notifyRemote(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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// timeout? mean don't want it. should stop sending as well
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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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