2 files changed, 23 insertions, 0 deletions
diff --git a/middleware/file/tree/all.go b/middleware/file/tree/all.go
new file mode 100644
index 000000000..f621e3465
--- /dev/null
+++ b/middleware/file/tree/all.go
@@ -0,0 +1,21 @@
+package tree
+
+// All traverses tree and returns all elements
+func (t *Tree) All() []*Elem {
+	if t.Root == nil {
+		return nil
+	}
+	found := t.Root.all(nil)
+	return found
+}
+
+func (n *Node) all(found []*Elem) []*Elem {
+	if n.Left != nil {
+		found = n.Left.all(found)
+	}
+	found = append(found, n.Elem)
+	if n.Right != nil {
+		found = n.Right.all(found)
+	}
+	return found
+}
diff --git a/middleware/file/tree/tree.go b/middleware/file/tree/tree.go
index db57c2092..234060eba 100644
--- a/middleware/file/tree/tree.go
+++ b/middleware/file/tree/tree.go
@@ -528,6 +528,8 @@ func (n *Node) floor(rr dns.RR) *Node {
 	return n
 }
 
+// TODO(successor, predecessor)
+
 // Ceil returns the smallest value equal to or greater than the query q according to q.Compare().
 func (t *Tree) Ceil(rr dns.RR) *Elem {
 	if t.Root == nil {