It's a Christmas miracle! refactored and got CNAME in one shot - W00T!

dns.type.cname.js

@@ -1,18 +1,13 @@
 (function (exports) {
 'use strict';
 
-// TODO. Not yet implemented
-
-// A CNAME reocord maps a single alias or nickname to the real or 
+// A CNAME reocord maps a single alias or nickname to the real or
 // Canonical name which may lie outside the current zone.
 // Canonical simply means the expected or real name.
 
-
-
-exports.DNS_TYPE_CNAME = function (rdata) {
-
-
-
+var unpackLabels = exports.DNS_UNPACK_LABELS || require('./dns.unpack-labels.js').DNS_UNPACK_LABELS;
+exports.DNS_TYPE_CNAME = function (ab, packet, record) {
+  return unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
 };
 
 }('undefined' !== typeof window ? window : exports));

dns.unpack-labels.js

@@ -0,0 +1,61 @@
+(function (exports) {
+'use strict';
+
+// unpack labels with 0x20 compression pointer support
+
+// ui8 is the ArrayBuffer of the entire packet
+// ptr is the current index of the packet
+// q = { byteLength: 0, cpcount: 0, labels: [], name: '' }
+exports.DNS_UNPACK_LABELS = function (ui8, ptr, q) {
+  if (q.cpcount > 25) {
+    throw new Error("compression pointer loop detected (over 25 pointers seems like a loop)");
+  }
+
+  var total = ptr;
+  var i;
+
+  var len;
+  var label = [];
+
+  do {
+    label.length = 0;
+    len = ui8[total];
+    if (0xc0 === len) {
+      var cpptr = ui8[total + 1];
+
+      // we're not coming back!
+      ptr = cpptr;
+      q.cpcount += 1;
+      q.byteLength += 2; // cp and len
+      return exports.DNS_UNPACK_LABELS(ui8, ptr, q);
+    }
+    //str.length = 0; // fast empty array
+    if (ui8.byteLength - total < len) {
+      throw new Error(
+        "Expected a string of length " + len
+          + " but packet itself has " + (ui8.byteLength - total) + " bytes remaining"
+      );
+    }
+    for (i = 0; i < len; i += 1) {
+      total += 1;
+      // TODO check url-allowable characters
+      label.push(String.fromCharCode(ui8[total]));
+    }
+    if (label.length) {
+      q.labels.push(label.join(''));
+    }
+    total += 1;
+    //console.log('total', total, ui8[total], String.fromCharCode(ui8[total]));
+  } while (len);
+
+  //str.pop(); // remove trailing '.'
+
+  q.name = q.labels.join('.');
+  if (0 === q.cpcount) {
+    q.byteLength = total - ptr;
+  }
+
+  return q;
+};
+
+}('undefined' !== typeof window ? window : exports));

pure-parser.js

@@ -1,3 +1,4 @@
+;(function (exports) {
 'use strict';
 
 var pdns = module.exports;
@@ -29,70 +30,7 @@ pdns.unpackHeader = function (i) {
   return header;
 };
 
-pdns.unpackQname = function (ui8, ptr, q) {
-  return pdns._unpackQname(ui8, ptr, q || {
-    name: ''
-  , type: 0
-  , typeName: ''
-  , class: 0
-  , className: ''
-  , byteLength: 0
-  , labels: []
-  , cpcount: 0
-  });
-};
-
-pdns._unpackQname = function (ui8, ptr, q) {
-  if (q.cpcount > 25) {
-    throw new Error("compression pointer loop detected (over 25 pointers seems like a loop)");
-  }
-
-  var total = ptr;
-  var i;
-
-  var len;
-  var label = [];
-
-  do {
-    label.length = 0;
-    len = ui8[total];
-    if (0xc0 === len) {
-      var cpptr = ui8[total + 1];
-
-      // we're not coming back!
-      ptr = cpptr;
-      q.cpcount += 1;
-      q.byteLength += 2; // cp and len
-      return pdns.unpackQname(ui8, ptr, q);
-    }
-    //str.length = 0; // fast empty array
-    if (ui8.byteLength - total < len) {
-      throw new Error(
-        "Expected a string of length " + len
-          + " but packet itself has " + (ui8.byteLength - total) + " bytes remaining"
-      );
-    }
-    for (i = 0; i < len; i += 1) {
-      total += 1;
-      // TODO check url-allowable characters
-      label.push(String.fromCharCode(ui8[total]));
-    }
-    if (label.length) {
-      q.labels.push(label.join(''));
-    }
-    total += 1;
-    //console.log('total', total, ui8[total], String.fromCharCode(ui8[total]));
-  } while (len);
-
-  //str.pop(); // remove trailing '.'
-
-  q.name = q.labels.join('.');
-  if (0 === q.cpcount) {
-    q.byteLength = total - ptr;
-  }
-
-  return q;
-};
+pdns._unpackLabels = exports.DNS_UNPACK_LABELS || require('./dns.unpack-labels.js').DNS_UNPACK_LABELS;
 
 pdns.unpack = function (ab) {
   if (ab.buffer) {
@@ -133,12 +71,21 @@ pdns.unpack = function (ab) {
   // TODO move to pdns.unpackQuestion to make testable
   function unpackQuestion(ab, dv, ui8, total) {
     var ototal = total;
-    var q = pdns.unpackQname(ui8, total);
+    var q = pdns._unpackLabels(ui8, total, {
+      name: ''
+    , type: 0
+    , typeName: ''
+    , class: 0
+    , className: ''
+    , byteLength: 0
+    , labels: []
+    , cpcount: 0
+    });
     //console.log('unpackQuestion QNAME:');
     //console.log(q);
     total += q.byteLength;
 
-    
+
 
 
 
@@ -161,13 +108,26 @@ pdns.unpack = function (ab) {
 
     console.log('*********************');
     console.log(q.typeName);
-  
+
     return q;
   }
 
   function unpackAnswer(ab, dv, ui8, total) {
     var ototal = total;
-    var q = pdns.unpackQname(ui8, total);
+    var q = pdns._unpackLabels(ui8, total, {
+      name: ''
+    , type: 0
+    , typeName: ''
+    , class: 0
+    , className: ''
+    , byteLength: 0
+    , labels: []
+    , cpcount: 0
+
+    , rdstart: 0
+    , rdata: 0
+    , rdlength: 0
+    });
     //console.log('unpackAnswer QNAME:');
     //console.log(q);
     total += q.byteLength;
@@ -193,9 +153,10 @@ pdns.unpack = function (ab) {
 
     q.className = classes[q.class];
     q.typeName = types[q.type];
- 
+
 
     // TODO actually parse RDATA
+    q.rdstart = total;
     q.rdata = new Uint8Array(ab).slice(total, total + q.rdlength);
     console.log('q.rdata', q.rdata.byteLength, 'bytes:');
     console.log(q.rdata);
@@ -250,3 +211,4 @@ pdns.unpack = function (ab) {
   return header;
 };
 pdns.unpackRdata = require('./dns.rdata.parse.js').DNS_RDATA_PARSE;
+}('undefined' !== typeof window ? window : exports));