now captures packets, yay!

README.md

@@ -62,8 +62,9 @@ Options
 ```
 --debug
 --mdns
--t <type> (superfluous)
+--output <path/to/file>     write query and response(s) to disk with this path prefix (ex: ./samples/dns)
--c <class>
+-t <type> (superfluous)     default ANY (mdns default: PTR)
--p <port>
+-c <class>                  default IN
--q <query> (superfluous)
+-p <port>                   default 53 (mdns default: 5353) (listener is random for DNS and 5353 for mDNS)
+-q <query> (superfluous)    required (ex: daplie.com)
 ```

bin/dig.js

@@ -87,6 +87,35 @@ function hexdump(ab) {
   return head + '\n' + str + '\n' + trail;
 }
 
+function writeQuery(opts, query, queryAb) {
+  var path = require('path');
+  var filename = query.question[0].name + '.' + query.question[0].typeName.toLowerCase() + '.query.bin';
+  var fullpath = opts.output + '.' + filename;
+  if (-1 !== ['.', '/', '\\' ].indexOf(opts.output[opts.output.length -1])) {
+    fullpath = path.join(opts.output, filename);
+  }
+
+  fs.writeFileAsync(fullpath, Buffer.from(queryAb)).then(function () {
+    console.log('wrote ' + queryAb.byteLength + ' bytes to ' + fullpath);
+  });
+}
+
+var count = 0;
+function writeResponse(opts, query, nb) {
+  var path = require('path');
+  var filename = query.question[0].name + '.' + query.question[0].typeName.toLowerCase() + '.' + count + '.bin';
+  var fullpath = opts.output + '.' + filename;
+  if (-1 !== ['.', '/', '\\' ].indexOf(opts.output[opts.output.length -1])) {
+    fullpath = path.join(opts.output, filename);
+  }
+
+  count += 1;
+
+  fs.writeFileAsync(fullpath, nb).then(function () {
+    console.log('wrote ' + nb.length + ' bytes to ' + fullpath);
+  });
+}
+
 function request(query, opts) {
   var queryAb = dnsjs.DNSPacket.write(query);
 
@@ -102,7 +131,6 @@ function request(query, opts) {
     console.log('');
   }
 
-  var count = 0;
   var handlers = {};
   var server = dgram.createSocket({
     type: 'udp4'
@@ -164,14 +192,9 @@ function request(query, opts) {
     console.log('');
 
     if (opts.output) {
-      var filename = packet.question[0].typeName + '-' + count + '.bin';
+      console.log('');
-      var fullpath = opts.output + filename;
+      writeQuery(opts, query, queryAb);
-
+      writeResponse(opts, query, nb);
-      count += 1;
-
-      return fs.writeFileAsync(fullpath, nb).then(function () {
-        console.log('wrote ' + nb.length + ' bytes to ' + fullpath);
-      });
     }
   };
   handlers.onListening = function () {