Add functions to check that a type is only or is not allowed in a question section

lib/dns/gen.c

@@ -15,7 +15,7 @@
  * SOFTWARE.
  */
 
-/* $Id: gen.c,v 1.33 2000/04/07 03:54:03 explorer Exp $ */
+/* $Id: gen.c,v 1.34 2000/04/14 20:13:43 explorer Exp $ */
 
 #include <config.h>
 
@@ -560,6 +560,9 @@ main(int argc, char **argv) {
 
 #define PRINT_COMMA(x) (x == 255 ? "" : ",")
 
+#define METANOTQUESTION  "DNS_RDATATYPEATTR_META | DNS_RDATATYPEATTR_NOTQUESTION"
+#define METAQUESTIONONLY "DNS_RDATATYPEATTR_META | DNS_RDATATYPEATTR_QUESTIONONLY"
+
 		printf("\ntypedef struct {\n");
 		printf("\tchar *name;\n");
 		printf("\tunsigned int flags;\n");
@@ -613,13 +616,13 @@ main(int argc, char **argv) {
 				break;
 			case 251:
 				printf("\t{ \"IXFR\", "
-				       "DNS_RDATATYPEATTR_META }%s\n",
+				       METANOTQUESTION " }%s\n",
 				       PRINT_COMMA(i));
 				special = 1;
 				break;
 			case 252:
 				printf("\t{ \"AXFR\", "
-				       "DNS_RDATATYPEATTR_META }%s\n",
+				       METANOTQUESTION " }%s\n",
 				       PRINT_COMMA(i));
 				special = 1;
 				break;
@@ -637,7 +640,7 @@ main(int argc, char **argv) {
 				break;
 			case 255:
 				printf("\t{ \"ANY\", "
-				       "DNS_RDATATYPEATTR_META }%s\n",
+				       METAQUESTIONONLY " }%s\n",
 				       PRINT_COMMA(i));
 				special = 1;
 				break;

lib/dns/include/dns/rdata.h

@@ -538,6 +538,28 @@ dns_rdata_digest(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg);
  *	Many other results are possible if not successful.
  */
 
+isc_boolean_t
+dns_rdatatype_questiononly(dns_rdatatype_t type);
+/*
+ * Return true iff rdata of type 'type' can only appear in the question
+ * section of a properly formatted message.
+ *
+ * Requires:
+ * 	'type' is a valid rdata type.
+ *
+ */
+
+isc_boolean_t
+dns_rdatatype_notquestion(dns_rdatatype_t type);
+/*
+ * Return true iff rdata of type 'type' can not appear in the question
+ * section of a properly formatted message.
+ *
+ * Requires:
+ * 	'type' is a valid rdata type.
+ *
+ */
+
 unsigned int
 dns_rdatatype_attributes(dns_rdatatype_t rdtype);
 /*
@@ -551,19 +573,23 @@ dns_rdatatype_attributes(dns_rdatatype_t rdtype);
  */
 
 /* only one may exist for a name */
-#define DNS_RDATATYPEATTR_SINGLETON	0x00000001U
+#define DNS_RDATATYPEATTR_SINGLETON		0x00000001U
 /* requires no other data be present */
-#define DNS_RDATATYPEATTR_EXCLUSIVE	0x00000002U
+#define DNS_RDATATYPEATTR_EXCLUSIVE		0x00000002U
 /* Is a meta type */
-#define DNS_RDATATYPEATTR_META		0x00000004U
+#define DNS_RDATATYPEATTR_META			0x00000004U
 /* Is a DNSSEC type, like SIG or NXT */
 #define DNS_RDATATYPEATTR_DNSSEC		0x00000008U
-/* Is a zone cut authority type XXXMLG */
+/* Is a zone cut authority type */
-#define DNS_RDATATYPEATTR_ZONECUTAUTH	0x00000010U
+#define DNS_RDATATYPEATTR_ZONECUTAUTH		0x00000010U
 /* Is reserved (unusable) */
 #define DNS_RDATATYPEATTR_RESERVED		0x00000020U
 /* Is an unknown type */
 #define DNS_RDATATYPEATTR_UNKNOWN		0x00000040U
+/* Is META, and can only be in a question section */
+#define DNS_RDATATYPEATTR_QUESTIONONLY		0x00000080U
+/* is META, and can NOT be in a question section */
+#define DNS_RDATATYPEATTR_NOTQUESTION		0x00000100U
 
 dns_rdatatype_t
 dns_rdata_covers(dns_rdata_t *rdata);

lib/dns/message.c

@@ -890,6 +890,15 @@ getquestions(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx)
 			result = DNS_R_FORMERR;
 			goto cleanup;
 		}
+
+		/*
+		 * If this is a type that cannot occur in a question section,
+		 * return failure.
+		 */
+		if (dns_rdatatype_notquestion(rdtype)) {
+			result = DNS_R_FORMERR;
+			goto cleanup;
+		}
 		
 		/*
 		 * Can't ask the same question twice.
@@ -1186,6 +1195,15 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
 		    skip_type_search)
 			result = ISC_R_NOTFOUND;
 		else {
+			/*
+			 * If this is a type that can only occur in
+			 * the question section, fail.
+			 */
+			if (dns_rdatatype_questiononly(rdtype)) {
+				result = DNS_R_FORMERR;
+				goto cleanup;
+			}
+
 			rdataset = NULL;
 			result = dns_message_findtype(name, rdtype, covers,
 						      &rdataset);

lib/dns/rdata.c

@@ -15,7 +15,7 @@
  * SOFTWARE.
  */
 
-/* $Id: rdata.c,v 1.76 2000/04/14 18:36:00 explorer Exp $ */
+/* $Id: rdata.c,v 1.77 2000/04/14 20:13:45 explorer Exp $ */
 
 #include <config.h>
 
@@ -1553,25 +1553,13 @@ dns_rdata_covers(dns_rdata_t *rdata)
 	return (covers_sig(rdata));
 }
 
-static isc_boolean_t
-ismeta(unsigned int code, struct tbl *table)
-{
-	struct tbl *t;
-	REQUIRE(code < 65536);
-	for (t = table; t->name != NULL; t++) {
-		if (code == t->value)
-			return ((t->flags & META) ? ISC_TRUE : ISC_FALSE);
-	}
-	return (ISC_FALSE); /* Unknown, assume non-meta. */
-}
-
 isc_boolean_t
 dns_rdatatype_ismeta(dns_rdatatype_t type)
 {
 	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_META) != 0)
 		return (ISC_TRUE);
 	return (ISC_FALSE);
-}	
+}
 
 isc_boolean_t
 dns_rdatatype_issingleton(dns_rdatatype_t type)
@@ -1580,12 +1568,39 @@ dns_rdatatype_issingleton(dns_rdatatype_t type)
 	    != 0)
 		return (ISC_TRUE);
 	return (ISC_FALSE);
-}	
+}
+
+isc_boolean_t
+dns_rdatatype_notquestion(dns_rdatatype_t type)
+{
+	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_NOTQUESTION)
+	    != 0)
+		return (ISC_TRUE);
+	return (ISC_FALSE);
+}
+
+isc_boolean_t
+dns_rdatatype_questiononly(dns_rdatatype_t type)
+{
+	if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_QUESTIONONLY)
+	    != 0)
+		return (ISC_TRUE);
+	return (ISC_FALSE);
+}
 
 isc_boolean_t
 dns_rdataclass_ismeta(dns_rdataclass_t rdclass)
 {
-	return (ismeta(rdclass, classes));
+	struct tbl *t;
+
+	REQUIRE(rdclass < 65536);
+
+	for (t = classes; t->name != NULL; t++) {
+		if (rdclass == t->value)
+			return ((t->flags & META) ? ISC_TRUE : ISC_FALSE);
+	}
+
+	return (ISC_FALSE);  /* assume it is not a meta class */
 }
 
 isc_boolean_t

lib/dns/rdata/any_255/tsig_250.c

@@ -15,7 +15,7 @@
  * SOFTWARE.
  */
 
-/* $Id: tsig_250.c,v 1.27 2000/04/07 03:54:06 explorer Exp $ */
+/* $Id: tsig_250.c,v 1.28 2000/04/14 20:13:48 explorer Exp $ */
 
 /* Reviewed: Thu Mar 16 13:39:43 PST 2000 by gson */
 
@@ -26,7 +26,7 @@
 
 #include <isc/str.h>
 
-#define RRTYPE_TSIG_ATTRIBUTES (DNS_RDATATYPEATTR_META)
+#define RRTYPE_TSIG_ATTRIBUTES (DNS_RDATATYPEATTR_META | DNS_RDATATYPEATTR_NOTQUESTION)
 
 static inline isc_result_t
 fromtext_any_tsig(dns_rdataclass_t rdclass, dns_rdatatype_t type,

lib/dns/rdata/generic/opt_41.c

@@ -15,7 +15,7 @@
  * SOFTWARE.
  */
 
-/* $Id: opt_41.c,v 1.7 2000/04/07 03:54:28 explorer Exp $ */
+/* $Id: opt_41.c,v 1.8 2000/04/14 20:13:49 explorer Exp $ */
 
 /* Reviewed: Thu Mar 16 14:06:44 PST 2000 by gson */
 
@@ -24,7 +24,7 @@
 #ifndef RDATA_GENERIC_OPT_41_C
 #define RDATA_GENERIC_OPT_41_C
 
-#define RRTYPE_OPT_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON)
+#define RRTYPE_OPT_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON | DNS_RDATATYPEATTR_META | DNS_RDATATYPEATTR_NOTQUESTION)
 
 static inline isc_result_t
 fromtext_opt(dns_rdataclass_t rdclass, dns_rdatatype_t type,