add RRSIG #3 (decode only)

index.js

@@ -80,6 +80,10 @@ class DNS extends EventEmitter {
  resolveDNSKEY(domain) {
  return this.resolve(domain, 'DNSKEY');
  }
+
+ resolveRRSIG(domain) {
+ return this.resolve(domain, 'RRSIG');
+ }
 }
 
 DNS.TCPServer = TCPServer;

packet.js

@@ -879,6 +879,62 @@ Packet.Resource.DNSKEY = {
  },
 };
 
+/**
+ * RRSIG just support decode
+ * test with dns.resolveRRSIG('example.com')
+ *
+ * @type {{decode: (function(*, *): Packet.Resource.RRSIG)}}
+ */
+Packet.Resource.RRSIG = {
+ decode: function(reader, length) {
+ function dateForSig(date) {
+ // javascript date is from millisecond
+ date = new Date(date * 1000);
+ const definitions = {
+ month : (date.getUTCMonth() + 1),
+ date : date.getUTCDate(),
+ hour : date.getUTCHours(),
+ minutes : date.getUTCMinutes(),
+ seconds : date.getUTCSeconds(),
+ };
+ let i;
+ for (i in definitions) {
+ // if less than 10 > single
+ if (definitions[i] < 10) {
+ definitions[i] = '0' + '' + definitions[i];
+ }
+ }
+ return date.getFullYear() + '' +
+ definitions.month + '' +
+ definitions.date + '' +
+ definitions.hour + '' +
+ definitions.minutes + '' +
+ definitions.seconds;
+ }
+
+ // calculate max-offset uint8
+ const maxOffset = reader.offset + (length * 8);
+ /*
+ * Stuff sign contains 18 octets
+ */
+ this.sigType = reader.read(16); // 2
+ this.algorithm = reader.read(8); // 1
+ this.labels = reader.read(8); // 1
+ this.originalTtl = reader.read(32); // 4
+ this.expiration = dateForSig(reader.read(32)); // 4
+ this.inception = dateForSig(reader.read(32)); // 4
+ this.keyTag = reader.read(16); // 2
+ this.signer = Packet.Name.decode(reader);
+ const maxLength = (maxOffset - reader.offset) / 8;
+ const signature = [];
+ while (signature.length < maxLength) {
+ signature.push(reader.read(8));
+ }
+ this.signature = Buffer.from(signature).toString('base64');
+ return this;
+ },
+};
+
 Packet.Reader = BufferReader;
 Packet.Writer = BufferWriter;