middleware/whois: hook it up

Hook it up properly by adding it to the directives list. And add
the Target to the SRV record to actually return valid DNS messages.

core/dnsserver/directives.go

@@ -92,4 +92,5 @@ var directives = []string{
 	"etcd",
 	"kubernetes",
 	"proxy",
+	"whoami",
 }

middleware/whoami/whoami.go

@@ -29,11 +29,11 @@ func (wh Whoami) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
 	switch state.Family() {
 	case 1:
 		rr = new(dns.A)
-		rr.(*dns.A).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: state.QType(), Class: state.QClass()}
+		rr.(*dns.A).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeA, Class: state.QClass()}
 		rr.(*dns.A).A = net.ParseIP(ip).To4()
 	case 2:
 		rr = new(dns.AAAA)
-		rr.(*dns.AAAA).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: state.QType(), Class: state.QClass()}
+		rr.(*dns.AAAA).Hdr = dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeAAAA, Class: state.QClass()}
 		rr.(*dns.AAAA).AAAA = net.ParseIP(ip)
 	}
 
@@ -41,10 +41,12 @@ func (wh Whoami) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
 	srv.Hdr = dns.RR_Header{Name: "_" + state.Proto() + "." + state.QName(), Rrtype: dns.TypeSRV, Class: state.QClass()}
 	port, _ := strconv.Atoi(state.Port())
 	srv.Port = uint16(port)
+	srv.Target = "."
 
-	a.Extra = append(a.Extra, rr)
-	a.Extra = append(a.Extra, srv)
+	a.Extra = []dns.RR{rr, srv}
 
+	state.SizeAndDo(a)
 	w.WriteMsg(a)
+
 	return 0, nil
 }