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Fix coredns, implement v2

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Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben
2020-06-04 13:36:27 +02:00
parent fafb347966
commit 29acaf739e
7 changed files with 85 additions and 200 deletions
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36
plugin/traffic/traffic.go
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@@ -54,28 +54,10 @@ func (t *Traffic) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg
// ok this cluster doesn't exist, potentially due to extra labels, which may be garbage or legit queries:
// legit is:
// endpoint-N.cluster
// _grpclb._tcp.cluster
// _tcp.cluster
// _grpc_config.cluster (singled out here, but not handled)
labels := dns.SplitDomainName(cluster)
switch len(labels) {
case 2:
// endpoint or _tcp or _grpc_config query
if strings.ToLower(labels[0]) == "_tcp" {
// nodata, because empty non-terminal
m.Ns = soa(state.Zone)
m.Rcode = dns.RcodeSuccess
w.WriteMsg(m)
return 0, nil
}
if strings.HasPrefix(strings.ToLower(labels[0]), "_grpc_config") {
// this is the grpc config blob encoded in a TXT record, see documentation for lbTXT.
m.Answer = txt(state.Zone, labels[1]) // 1 is the cluster
m.Rcode = dns.RcodeSuccess
w.WriteMsg(m)
return 0, nil
}
if strings.HasPrefix(strings.ToLower(labels[0]), "endpoint-") {
// recheck if the cluster exist.
cluster = labels[1]
@@ -88,24 +70,6 @@ func (t *Traffic) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg
}
return t.serveEndpoint(ctx, state, labels[0], cluster, healthy)
}
case 3:
if strings.ToLower(labels[0]) != "_grpclb" || strings.ToLower(labels[1]) != "_tcp" {
m.Ns = soa(state.Zone)
m.Rcode = dns.RcodeNameError
w.WriteMsg(m)
return 0, nil
}
// OK, _grcplb._tcp query; we need to return the endpoint for the cluster in this query
cluster = labels[2]
sockaddr, ok = t.c.Select(cluster, healthy)
if !ok {
// nodata error when this cluster doesn't exist.
m.Ns = soa(state.Zone)
m.Rcode = dns.RcodeSuccess
w.WriteMsg(m)
return 0, nil
}
break
default:
m.Ns = soa(state.Zone)
m.Rcode = dns.RcodeNameError