Make reverse dns lookups honor tombstones.

nameserver/nameserver.go

@@ -121,7 +121,7 @@ func (n *Nameserver) ReverseLookup(ip address.Address) (string, error) {
 	defer n.RUnlock()
 
 	match, err := n.entries.first(func(e *Entry) bool {
-		return e.Addr == ip
+		return e.Tombstone == 0 && e.Addr == ip
 	})
 	if err != nil {
 		return "", err

test/265_dns_reverse_test.sh

@@ -0,0 +1,18 @@
+#! /bin/bash
+
+. ./config.sh
+
+IP=10.2.0.67
+
+start_suite "Reverse DNS test"
+
+weave_on $HOST1 launch
+start_container_with_dns $HOST1 --name=c1
+
+for name in bar bar black sheep have you any wool; do
+    start_container $HOST1 $IP/24 --name=$name
+    assert "exec_on $HOST1 c1 dig +short -x $IP" $name.weave.local.
+    rm_containers $HOST1 $name
+done
+
+end_suite