3191. [bug] Print NULL records using unknown format. [RT #26392]

CHANGES

@@ -1,3 +1,5 @@
+3191.	[bug]		Print NULL records using "unknown" format. [RT #26392]
+
 3190.	[bug]		Underflow in error handling in isc_mutexblock_init.
 			[RT #26397]
 

bin/tests/system/unknown/ns1/example-in.db

@@ -13,7 +13,7 @@
 ; OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 ; PERFORMANCE OF THIS SOFTWARE.
 
-; $Id: example-in.db,v 1.7 2007/06/19 23:47:06 tbox Exp $
+; $Id: example-in.db,v 1.8 2011/11/02 01:01:52 marka Exp $
 
 $TTL 300	; 5 minutes
 @			SOA	mname1. . (
@@ -39,6 +39,9 @@ a10		IN	TYPE1	\# 4 0A000001
 a11		IN	TYPE1	\# 4 0a000001
 a12		IN	A	\# 4 0A000001
 
+null		IN	NULL	\# 1 00
+empty		IN	NULL	\# 0
+
 txt1		IN	TXT	"hello"
 txt2		CLASS1	TXT	"hello"
 txt3		IN	TYPE16	"hello"

bin/tests/system/unknown/tests.sh

@@ -15,7 +15,7 @@
 # OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 
-# $Id: tests.sh,v 1.10 2007/06/19 23:47:06 tbox Exp $
+# $Id: tests.sh,v 1.11 2011/11/02 01:01:52 marka Exp $
 
 SYSTEMTESTTOP=..
 . $SYSTEMTESTTOP/conf.sh
@@ -63,6 +63,20 @@ do
 	status=`expr $status + $ret`
 done
 
+echo "I:querying for NULL record"
+ret=0
+$DIG +short $DIGOPTS null.example null in > dig.out || ret=1
+echo '\# 1 00' | diff - dig.out || ret=1
+[ $ret = 0 ] || echo "I: failed"
+status=`expr $status + $ret`
+
+echo "I:querying for empty NULL record"
+ret=0
+$DIG +short $DIGOPTS empty.example null in > dig.out || ret=1
+echo '\# 0' | diff - dig.out || ret=1
+[ $ret = 0 ] || echo "I: failed"
+status=`expr $status + $ret`
+
 echo "I:querying for various representations of a CLASS10 TYPE1 record"
 for i in 1 2
 do

lib/dns/rdata.c

@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdata.c,v 1.213 2011/03/11 06:11:24 marka Exp $ */
+/* $Id: rdata.c,v 1.214 2011/11/02 01:01:52 marka Exp $ */
 
 /*! \file */
 
@@ -217,6 +217,10 @@ warn_badmx(isc_token_t *token, isc_lex_t *lexer,
 static isc_uint16_t
 uint16_consume_fromregion(isc_region_t *region);
 
+static isc_result_t
+unknown_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
+	       isc_buffer_t *target);
+
 static inline int
 getquad(const void *src, struct in_addr *dst,
 	isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks)
@@ -691,14 +695,54 @@ dns_rdata_fromtext(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
 	return (result);
 }
 
+static isc_result_t
+unknown_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
+	       isc_buffer_t *target)
+{
+	isc_result_t result;
+	char buf[sizeof("65535")];
+	isc_region_t sr;
+
+	strlcpy(buf, "\\# ", sizeof(buf));
+	result = str_totext(buf, target);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	dns_rdata_toregion(rdata, &sr);
+	INSIST(sr.length < 65536);
+	snprintf(buf, sizeof(buf), "%u", sr.length);
+	result = str_totext(buf, target);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	if (sr.length != 0U) {
+		if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
+			result = str_totext(" ( ", target);
+		else
+			result = str_totext(" ", target);
+
+		if (result != ISC_R_SUCCESS)
+			return (result);
+
+		if (tctx->width == 0) /* No splitting */
+			result = isc_hex_totext(&sr, 0, "", target);
+		else
+			result = isc_hex_totext(&sr, tctx->width - 2,
+						tctx->linebreak,
+						target);
+		if (result == ISC_R_SUCCESS &&
+		    (tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
+			result = str_totext(" )", target);
+	}
+	return (result);
+}
+
 static isc_result_t
 rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
 	     isc_buffer_t *target)
 {
 	isc_result_t result = ISC_R_NOTIMPLEMENTED;
 	isc_boolean_t use_default = ISC_FALSE;
-	char buf[sizeof("65535")];
-	isc_region_t sr;
 
 	REQUIRE(rdata != NULL);
 	REQUIRE(tctx->origin == NULL ||
@@ -714,34 +758,8 @@ rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
 
 	TOTEXTSWITCH
 
-	if (use_default) {
-		strlcpy(buf, "\\# ", sizeof(buf));
-		result = str_totext(buf, target);
-		INSIST(result == ISC_R_SUCCESS);
-		dns_rdata_toregion(rdata, &sr);
-		INSIST(sr.length < 65536);
-		snprintf(buf, sizeof(buf), "%u", sr.length);
-		result = str_totext(buf, target);
-		if (sr.length != 0 && result == ISC_R_SUCCESS) {
-			if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
-				result = str_totext(" ( ", target);
-			else
-				result = str_totext(" ", target);
-
-			if (result != ISC_R_SUCCESS)
-				return (result);
-
-			if (tctx->width == 0) /* No splitting */
-				result = isc_hex_totext(&sr, 0, "", target);
-			else
-				result = isc_hex_totext(&sr, tctx->width - 2,
-							tctx->linebreak,
-							target);
-			if (result == ISC_R_SUCCESS &&
-			    (tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
-				result = str_totext(" )", target);
-		}
-	}
+	if (use_default)
+		result = unknown_totext(rdata, tctx, target);
 
 	return (result);
 }

lib/dns/rdata/generic/null_10.c

@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: null_10.c,v 1.44 2009/12/04 22:06:37 tbox Exp $ */
+/* $Id: null_10.c,v 1.45 2011/11/02 01:01:52 marka Exp $ */
 
 /* Reviewed: Thu Mar 16 13:57:50 PST 2000 by explorer */
 
@@ -43,11 +43,7 @@ static inline isc_result_t
 totext_null(ARGS_TOTEXT) {
 	REQUIRE(rdata->type == 10);
 
-	UNUSED(rdata);
-	UNUSED(tctx);
-	UNUSED(target);
-
-	return (DNS_R_SYNTAX);
+	return (unknown_totext(rdata, tctx, target));
 }
 
 static inline isc_result_t