From 12b304d981b840d054c64341591de2571fe7734d Mon Sep 17 00:00:00 2001
From: Miek Gieben <miek@miek.nl>
Date: Sat, 9 Apr 2016 16:39:50 +0100
Subject: [PATCH] Allow IXFR as well (#97)

---
 middleware/file/xfr.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/middleware/file/xfr.go b/middleware/file/xfr.go
index 92811d7a7..228e11c5f 100644
--- a/middleware/file/xfr.go
+++ b/middleware/file/xfr.go
@@ -16,13 +16,13 @@ type (
 	}
 )
 
-// Serve an AXFR (or maybe later an IXFR) as well.
+// Serve an AXFR (and fallback of IXFR) as well.
 func (x Xfr) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
 	state := middleware.State{W: w, Req: r}
 	if !x.TransferAllowed(state) {
 		return dns.RcodeServerFailure, nil
 	}
-	if state.QType() != dns.TypeAXFR {
+	if state.QType() != dns.TypeAXFR && state.QType() != dns.TypeIXFR {
 		return 0, fmt.Errorf("xfr called with non transfer type: %d", state.QType())
 	}