Add EDNS0_SUBNET rewrite (#1022)

* Add EDNS0_SUBNET rewrite

* Fix review comments

* Update comment

* Fix according to review comments

* Add ResponseWriter6 instead of parameterized the existing ResponseWriter

1 files changed, 17 insertions, 0 deletions

diff --git a/middleware/test/responsewriter.go b/middleware/test/responsewriter.go
index 7aa6dd133..79eaa00f3 100644
--- a/middleware/test/responsewriter.go
+++ b/middleware/test/responsewriter.go
@@ -42,3 +42,20 @@ func (t *ResponseWriter) TsigTimersOnly(bool) { return }
 
 // Hijack implement dns.ResponseWriter interface.
 func (t *ResponseWriter) Hijack() { return }
+
+// RepsponseWrite6 returns fixed client and remote address in IPv6.  The remote
+// address is always fe80::42:ff:feca:4c65 and port 40212. The local address
+// is always ::1 and port 53.
+type ResponseWriter6 struct {
+	ResponseWriter
+}
+
+// LocalAddr returns the local address, always ::1, port 53 (UDP).
+func (t *ResponseWriter6) LocalAddr() net.Addr {
+	return &net.UDPAddr{IP: net.ParseIP("::1"), Port: 53, Zone: ""}
+}
+
+// RemoteAddr returns the remote address, always fe80::42:ff:feca:4c65 port 40212 (UDP).
+func (t *ResponseWriter6) RemoteAddr() net.Addr {
+	return &net.UDPAddr{IP: net.ParseIP("fe80::42:ff:feca:4c65"), Port: 40212, Zone: ""}
+}