Support IN DS messages

Author: jhs

_test_data/ds-query

@@ -169,6 +169,13 @@ State.prototype.record = function(section_name, record) {
                 , self.encode(record.data.target, 2 + 6, 'nocompress') // Offset for rdata length + priority, weight, and port.
                 ]
         break
+      case 'IN DS':
+        rdata = [ buf16(record.data.key_tag)
+                , new Buffer([record.data.algorithm])
+                , new Buffer([record.data.digest_type])
+                , new Buffer(record.data.digest)
+                ]
+        break
       case 'NONE A':
         // I think this is no data, from RFC 2136 S. 2.4.3.
         rdata = []

_test_data/ds-response

@@ -256,6 +256,13 @@ DNSRecord.prototype.parse = function(body, section_name, record_num, sections) {
       self.data = parse.soa(body, rdata)
       self.data.rname = self.data.rname.replace(/\./, '@')
       break
+    case 'IN DS':
+      self.data = { 'key_tag'    : rdata[0] << 8 | rdata[1]
+                  , 'algorithm'  : rdata[2]
+                  , 'digest_type': rdata[3]
+                  , 'digest'     : rdata.slice(4).toJSON() // Convert to a list of numbers.
+                  }
+      break
     case 'NONE A':
       self.data = []
       break

encode.js

@@ -193,7 +193,7 @@ test('Encoding messages', function(t) {
               , 'www.company.example-response', 'www.microsoft.com-query', 'www.microsoft.com-response'
               , 'iriscouch.com-query', 'iriscouch.com-response', 'foo.iriscouch.com-query', 'foo.iriscouch.com-response'
               , 'registry.npmjs.org-response', 'srv-query', 'srv-response', 'txt-query', 'txt-response'
-              , 'ptr-query', 'ptr-response', 'aaaa-query', 'aaaa-response', 'ipv6_ptr-query'
+              , 'ptr-query', 'ptr-response', 'aaaa-query', 'aaaa-response', 'ipv6_ptr-query', 'ds-query', 'ds-response'
               ]
 
   t.plan(3 * files.length) // 3 for each file