limited how often we log about unsupported features

dns.js

@@ -5,6 +5,8 @@ var Parser = (exports.DNS_PARSER || require('./dns.parser.js').DNS_PARSER);
 var Packer = (exports.DNS_PACKER || require('./dns.packer.js').DNS_PACKER);
 //var classes = exports.DNS_CLASSES || require('./dns.classes.js').DNS_CLASSES;
 //var types = exports.DNS_TYPES || require('./dns.types.js').DNS_TYPES;
+var logged = {};
+
 exports.DNSPacket = {
   parse: function (nb) {
     // backwards compat with node buffer
@@ -21,8 +23,14 @@ exports.DNSPacket = {
 
         record = Parser.unpackRdata(ab, packet, record);
       } catch (e) {
-        console.error('[Error] unpackRdata: ' + e.message);
         record.error = e;
+        if (!/^support for dns/i.test(e.message)) {
+          console.error('[Error] unpackRdata: ' + e.message);
+        }
+        else if (!logged[e.message]) {
+          console.error('[Error] unpackRdata: ' + e.message);
+          logged[e.message] = true;
+        }
       }
     }
 

dns.parser.js

@@ -31,13 +31,17 @@ pdns.unpackHeader = function (i) {
 
 pdns._unpackLabels = exports.DNS_UNPACK_LABELS || require('./dns.unpack-labels.js').DNS_UNPACK_LABELS;
 
+var optWarned = false;
 pdns.unpackOpt = function (ab, packet, rec) {
   var dv;
 
   // https://tools.ietf.org/html/rfc6891#section-6
-  console.log('OPT is not yet supported');
+  if (!optWarned) {
+    console.warn('OPT is not yet supported');
+    optWarned = true;
+  }
   if ('undefined' !== typeof packet.edns_version) {
-    console.warn("More that one OPT, should respond with FORMERR, but not implmentede");
+    console.warn("More that one OPT, should respond with FORMERR, but not implemented");
   }
   if (packet.name) {
     console.warn("name '" + packet.name + "' should not exist for type OPT 0x29 41");
@@ -60,11 +64,11 @@ pdns.unpackOpt = function (ab, packet, rec) {
   packet.edns_version = dv.getUint8(1, false);
   packet.do = dv.getUint8(2, false) & 0x8000; // 1000 0000
   packet.z = dv.getUint16(2, false) & 0x7FFF; // 0111 1111
-    /*
+  /*
-"edns_options": [],
+  "edns_options": [],
-"payload": 4096,
+  "payload": 4096,
-"edns_version": 0,
+  "edns_version": 0,
-"do": 0
+  "do": 0
   */
 };
 pdns.unpack = function (ab) {