From 3a7ad5d47d5f3bb32800d956c098c3d49c343453 Mon Sep 17 00:00:00 2001
From: gVisor bot <gvisor-bot@google.com>
Date: Wed, 29 Apr 2020 11:21:37 +0800
Subject: [PATCH] Fix: dns return empty success for AAAA & recursion in fake ip
 mode (#663)

---
 dns/middleware.go | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/dns/middleware.go b/dns/middleware.go
index 90d5a7fe..4d97e65d 100644
--- a/dns/middleware.go
+++ b/dns/middleware.go
@@ -18,7 +18,14 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			q := r.Question[0]
 
 			if q.Qtype == D.TypeAAAA {
-				D.HandleFailed(w, r)
+				msg := &D.Msg{}
+				msg.Answer = []D.RR{}
+
+				msg.SetRcode(r, D.RcodeSuccess)
+				msg.Authoritative = true
+				msg.RecursionAvailable = true
+
+				w.WriteMsg(msg)
 				return
 			} else if q.Qtype != D.TypeA {
 				next(w, r)
@@ -39,8 +46,10 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			msg.Answer = []D.RR{rr}
 
 			setMsgTTL(msg, 1)
-			msg.SetRcode(r, msg.Rcode)
+			msg.SetRcode(r, D.RcodeSuccess)
 			msg.Authoritative = true
+			msg.RecursionAvailable = true
+
 			w.WriteMsg(msg)
 			return
 		}