ask the database for aaaa records too, when an a6 isn't found.

diff --git a/lib/dns/adb.c b/lib/dns/adb.c
index ae860c9780ce0ae5accc94104a91c61355d4f81a..ae6c4591241fe115874a5ac91a73a5adb7969728 100644 (file)
--- a/lib/dns/adb.c
+++ b/lib/dns/adb.c
@@ -1,3 +1,4 @@
+
 /*
  * Copyright (C) 1999, 2000  Internet Software Consortium.
  *
@@ -15,7 +16,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: adb.c,v 1.150 2000/09/06 02:39:56 explorer Exp $ */
+/* $Id: adb.c,v 1.151 2000/09/26 22:28:55 explorer Exp $ */
 
 /*
  * Implementation notes
@@ -418,6 +419,8 @@ static isc_result_t dbfind_a6(dns_adbname_t *, isc_stdtime_t);
                                 (r) == DNS_R_NXRRSET)
 #define NXDOMAIN_RESULT(r)     ((r) == DNS_R_NXDOMAIN || \
                                 (r) == DNS_R_NCACHENXDOMAIN)
+#define NXRRSET_RESULT(r)      ((r) == DNS_R_NCACHENXRRSET || \
+                                (r) == DNS_R_NXRRSET)
 
 /*
  * Error state rankings.
@@ -2559,10 +2562,17 @@ dns_adb_createfind(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
                }
 
                /*
-                * Listen to negative cache hints, and don't start
-                * another query.
+                * If the name doesn't exist at all, don't bother with
+                * v6 queries; they won't work.
+                *
+                * If the name does exist but we didn't get our data, go
+                * ahead and try a6.
+                *
+                * If the result is neigher of these, try a fetch for A.
                 */
-               if (NCACHE_RESULT(result) || AUTH_NX(result))
+               if (NXDOMAIN_RESULT(result))
+                       goto fetch;
+               else if (NXRRSET_RESULT(result))
                        goto v6;
 
                wanted_fetches |= DNS_ADBFIND_INET;
@@ -2591,6 +2601,47 @@ dns_adb_createfind(dns_adb_t *adb, isc_task_t *task, isc_taskaction_t action,
                        goto post_copy;
                }
 
+               /*
+                * If the name doesn't exist at all, jump to the fetch
+                * code.
+                *
+                * If the name exists but the A6 doesn't, try starting
+                * an aaaa database search.
+                *
+                * If neither of these are true, say we want an A6 fetch
+                * and perhaps we'll get lucky.
+                */
+               if (NXDOMAIN_RESULT(result))
+                       goto fetch;
+               else if (NXRRSET_RESULT(result))
+                       goto aaaa;
+               else {
+                       wanted_fetches |= DNS_ADBFIND_INET6;
+                       goto fetch;
+               }
+
+           aaaa:
+               result = dbfind_name(adbname, now, dns_rdatatype_aaaa);
+               if (result == ISC_R_SUCCESS) {
+                       DP(DEF_LEVEL,
+                          "dns_adb_createfind: found AAAA for name %p",
+                          adbname);
+                       goto fetch;
+               }
+
+               /*
+                * Did we get a CNAME or DNAME?  This should have hit
+                * during the A6 query, but we'll reproduce it here Just
+                * In Case.
+                */
+               if (result == DNS_R_ALIAS) {
+                       DP(DEF_LEVEL,
+                          "dns_adb_createfind: name %p is an alias",
+                          adbname);
+                       alias = ISC_TRUE;
+                       goto post_copy;
+               }
+
                /*
                 * Listen to negative cache hints, and don't start
                 * another query.
@@ -3275,7 +3326,7 @@ dbfind_a6(dns_adbname_t *adbname, isc_stdtime_t now) {
                 * for now.
                 */
                DP(NCACHE_LEVEL,
-                  "adb name %p: Caching auth negative entry for AAAA",
+                  "adb name %p: Caching auth negative entry for A6",
                   adbname);
                adbname->expire_v6 = now + 30;
                if (result == DNS_R_NXDOMAIN)