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Implement SRV records

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Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben
2020-01-18 20:12:25 +01:00
parent 63d3dfb0e1
commit 9d912fe2ca
5 changed files with 89 additions and 29 deletions
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36
plugin/traffic/traffic.go
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@@ -38,12 +38,27 @@ func (t *Traffic) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg
m.SetReply(r)
m.Authoritative = true
addr, ok := t.c.Select(cluster)
addr, port, ok := t.c.Select(cluster)
if !ok {
m.Ns = soa(state.Zone)
m.Rcode = dns.RcodeNameError
w.WriteMsg(m)
return 0, nil
// ok the cluster (which has potentially extra labels), doesn't exist, but we may have a query for endpoint-0.<cluster>.
// check if we have 2 labels and that the first equals endpoint-0.
if dns.CountLabel(cluster) != 2 {
m.Ns = soa(state.Zone)
m.Rcode = dns.RcodeNameError
w.WriteMsg(m)
return 0, nil
}
labels := dns.SplitDomainName(cluster)
if strings.Compare(labels[0], "endpoint-0") == 0 {
// recheck if the cluster exist.
addr, port, ok = t.c.Select(labels[1])
if !ok {
m.Ns = soa(state.Zone)
m.Rcode = dns.RcodeNameError
w.WriteMsg(m)
return 0, nil
}
}
}
if addr == nil {
@@ -66,7 +81,16 @@ func (t *Traffic) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg
m.Ns = soa(state.Zone)
break
}
m.Answer = []dns.RR{&dns.AAAA{Hdr: dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 5}, AAAA: addr}}
m.Answer = []dns.RR{&dns.AAAA{Hdr: dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 5}, AAAA: addr}}
case dns.TypeSRV:
target := dnsutil.Join("endpoint-0", cluster) + state.Zone
m.Answer = []dns.RR{&dns.SRV{Hdr: dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 5},
Priority: 100, Weight: 100, Port: port, Target: target}}
if addr.To4() == nil {
m.Extra = []dns.RR{&dns.AAAA{Hdr: dns.RR_Header{Name: target, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 5}, AAAA: addr}}
} else {
m.Extra = []dns.RR{&dns.A{Hdr: dns.RR_Header{Name: target, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 5}, A: addr}}
}
default:
m.Ns = soa(state.Zone)
}