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package transfer
import (
"fmt"
"github.com/coredns/coredns/plugin/pkg/rcode"
"github.com/miekg/dns"
)
// Notify will send notifies to all configured to hosts IP addresses. If the zone isn't known
// to t an error will be returned. The string zone must be lowercased.
func (t *Transfer) Notify(zone string) error {
if t == nil { // t might be nil, mostly expected in tests, so intercept and to a noop in that case
return nil
}
m := new(dns.Msg)
m.SetNotify(zone)
c := new(dns.Client)
x := longestMatch(t.xfrs, zone)
if x == nil {
return fmt.Errorf("no such zone registred in the transfer plugin: %s", zone)
}
var err1 error
for _, t := range x.to {
if t == "*" {
continue
}
if err := sendNotify(c, m, t); err != nil {
err1 = err
}
}
log.Debugf("Sent notifies for zone %q to %v", zone, x.to)
return err1 // this only captures the last error
}
func sendNotify(c *dns.Client, m *dns.Msg, s string) error {
var err error
code := dns.RcodeServerFailure
for i := 0; i < 3; i++ {
ret, _, err := c.Exchange(m, s)
if err != nil {
continue
}
code = ret.Rcode
if code == dns.RcodeSuccess {
return nil
}
}
if err != nil {
return fmt.Errorf("notify for zone %q was not accepted by %q: %q", m.Question[0].Name, s, err)
}
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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