don't modify original object, chimney

dns.packer.js

@@ -23,10 +23,10 @@ var dnspack = exports.DNS_PACKER = {
     dv.setUint16(0, id, false);
     dv.setUint16(2, header, false);
     dv.setUint16(4, packet.question.length, false);
-    dv.setUint16(6, packet.answer.length, false);
-    dv.setUint16(8, packet.authority.length, false);
+    dv.setUint16(6, (packet.answer||[]).length, false);
+    dv.setUint16(8, (packet.authority||[]).length, false);
     // EDNS is added as an additional with TYPE 41 (OPT, 0x29)
-    dv.setUint16(10, packet.additional.length + (packet.payload ? 1 : 0), false);
+    dv.setUint16(10, (packet.additional||[]).length + (packet.payload ? 1 : 0), false);
 
     function lint(r) {
       if (!r.name) {
@@ -37,24 +37,20 @@ var dnspack = exports.DNS_PACKER = {
         if (!r.className) {
           throw new Error("no className");
         }
-        r.class = classes[r.className];
       }
 
       if (!r.type) {
         if (!r.typeName) {
           throw new Error("no typeName");
         }
-        r.type = types[r.typeName];
-        if (!r.type) {
+        if (!types[r.typeName]) {
           console.warn("ignoring invalid type '" + r.type + "' for '" + r.name + "', ignoring");
         }
       }
     }
 
     function packLabelSequence(sequence, terminates) {
-      console.log('sequence:', sequence);
       if (labelsMap[sequence]) {
-        console.log('cached sequence:', sequence);
         // minimal compression pointer 0xc0 (192)
         dv.setUint8(total, 0xc0, false);
         total += 1;
@@ -88,9 +84,9 @@ var dnspack = exports.DNS_PACKER = {
 
       packLabelSequence(q.name, true);
 
-      dv.setUint16(total, q.type, false);
+      dv.setUint16(total, q.type || types[q.typeName], false);
       total += 2;
-      dv.setUint16(total, q.class, false);
+      dv.setUint16(total, q.class || classes[q.className], false);
       total += 2;
     }
 
@@ -118,13 +114,10 @@ var dnspack = exports.DNS_PACKER = {
       }
     }
 
-    //console.log(packet);
-    // fixed size, other than labels
-
     packet.question.forEach(packQuestion);
-    packet.answer.forEach(packAnswer);
-    packet.authority.forEach(packAnswer);
-    packet.additional.forEach(packAnswer);
+    (packet.answer||[]).forEach(packAnswer);
+    (packet.authority||[]).forEach(packAnswer);
+    (packet.additional||[]).forEach(packAnswer);
 
     // TODO handle compression pointers
     // TODO handle edns