rec: Refuse queries for rfc6895 section 3.1 meta types

(cherry picked from commit a10ff05255106b8ce8755013fd07077b45ea65e2)

diff --git a/pdns/syncres.cc b/pdns/syncres.cc
index 16c7c73dd145a017704a5d6780c5caccd1d263d9..caaa330784c102c99168955fb8b9324d3960b03a 100644 (file)
--- a/pdns/syncres.cc
+++ b/pdns/syncres.cc
@@ -119,6 +119,8 @@ SyncRes::SyncRes(const struct timeval& now) :  d_authzonequeries(0), d_outquerie
 /** everything begins here - this is the entry point just after receiving a packet */
 int SyncRes::beginResolve(const DNSName &qname, const QType &qtype, uint16_t qclass, vector<DNSRecord>&ret)
 {
+  /* rfc6895 section 3.1 + RRSIG and NSEC3 */
+  static const std::set<uint16_t> metaTypes = { QType::AXFR, QType::IXFR, QType::RRSIG, QType::NSEC3, QType::OPT, QType::TSIG, QType::TKEY, QType::MAILA, QType::MAILB };
   vState state = Indeterminate;
   s_queries++;
   d_wasVariable=false;
@@ -129,8 +131,9 @@ int SyncRes::beginResolve(const DNSName &qname, const QType &qtype, uint16_t qcl
     return 0;                          // so do check before updating counters (we do now)
   }
 
-  if( (qtype.getCode() == QType::AXFR) || (qtype.getCode() == QType::IXFR) || (qtype.getCode() == QType::RRSIG) || (qtype.getCode() == QType::NSEC3))
+  if (metaTypes.count(qtype.getCode())) {
     return -1;
+  }
 
   if(qclass==QClass::ANY)
     qclass=QClass::IN;