From 99a8d30559834dc12bd80f4f164fa6375f73cb62 Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Tue, 5 Jun 2001 23:43:15 +0000
Subject: [PATCH]  860.   [func]          Drop cross class glue in zone
 transfers.

---
 CHANGES         | 1 +
 lib/dns/xfrin.c | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index cfc8c17c4b..d9f9454a46 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,4 @@
+ 860.	[func]		Drop cross class glue in zone transfers.
 
  859.	[bug]		Cache cleaning now won't swamp the CPU if there
 			is a persistent overlimit condition.
diff --git a/lib/dns/xfrin.c b/lib/dns/xfrin.c
index a2eeab210b..e28fe8068a 100644
--- a/lib/dns/xfrin.c
+++ b/lib/dns/xfrin.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: xfrin.c,v 1.121 2001/06/04 19:33:16 tale Exp $ */
+/* $Id: xfrin.c,v 1.122 2001/06/05 23:43:15 marka Exp $ */
 
 #include <config.h>
 
@@ -528,6 +528,13 @@ xfr_rr(dns_xfrin_ctx_t *xfr, dns_name_t *name, isc_uint32_t ttl,
 		break;
 
 	case XFRST_AXFR:
+		/*
+		 * Old BIND's sent cross class A records for non IN classes.
+		 */
+		if (rdata->type == dns_rdatatype_a &&
+		    rdata->rdclass != xfr->rdclass &&
+		    xfr->rdclass != dns_rdataclass_in)
+			break;
 		CHECK(axfr_putdata(xfr, DNS_DIFFOP_ADD, name, ttl, rdata));
 		if (rdata->type == dns_rdatatype_soa) {
 			CHECK(axfr_commit(xfr));