add dns key

index.js

@@ -76,6 +76,10 @@ class DNS extends EventEmitter {
  resolvePTR(domain) {
  return this.resolve(domain, 'PTR');
  }
+
+ resolveDNSKEY(domain) {
+ return this.resolve(domain, 'DNSKEY');
+ }
 }
 
 DNS.TCPServer = TCPServer;

packet.js

@@ -76,31 +76,32 @@ function Packet(data) {
  * @docs https://tools.ietf.org/html/rfc1035#section-3.2.2
  */
 Packet.TYPE = {
- A : 0x01,
- NS : 0x02,
- MD : 0x03,
- MF : 0x04,
- CNAME : 0x05,
- SOA : 0x06,
- MB : 0x07,
- MG : 0x08,
- MR : 0x09,
- NULL : 0x0A,
- WKS : 0x0B,
- PTR : 0x0C,
- HINFO : 0x0D,
- MINFO : 0x0E,
- MX : 0x0F,
- TXT : 0x10,
- AAAA : 0x1C,
- SRV : 0x21,
- EDNS : 0x29,
- SPF : 0x63,
- AXFR : 0xFC,
- MAILB : 0xFD,
- MAILA : 0xFE,
- ANY : 0xFF,
- CAA : 0x101,
+ A : 0x01,
+ NS : 0x02,
+ MD : 0x03,
+ MF : 0x04,
+ CNAME : 0x05,
+ SOA : 0x06,
+ MB : 0x07,
+ MG : 0x08,
+ MR : 0x09,
+ NULL : 0x0A,
+ WKS : 0x0B,
+ PTR : 0x0C,
+ HINFO : 0x0D,
+ MINFO : 0x0E,
+ MX : 0x0F,
+ TXT : 0x10,
+ AAAA : 0x1C,
+ SRV : 0x21,
+ EDNS : 0x29,
+ SPF : 0x63,
+ AXFR : 0xFC,
+ MAILB : 0xFD,
+ MAILA : 0xFE,
+ ANY : 0xFF,
+ CAA : 0x101,
+ DNSKEY : 0x30,
 };
 /**
  * [QUERY_CLASS description]
@@ -830,6 +831,54 @@ Packet.Resource.CAA = {
  },
 };
 
+/**
+ * @type {{decode: (function(*, *): Packet.Resource.DNSKEY)}}
+ * @link https://tools.ietf.org/html/rfc4034
+ * @link https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml#table-dns-sec-alg-numbers-1
+ */
+Packet.Resource.DNSKEY = {
+ decode: function(reader, length) {
+ const RData = [];
+ while (RData.length < length) {
+ RData.push(reader.read(8));
+ }
+ this.flags = RData[0] << 8 | RData[1];
+ this.protocol = RData[2];
+ this.algorithm = RData[3];
+ // for key tag
+ let ac = 0;
+ for (let i = 0; i < length; ++i) {
+ ac += (i & 1) ? RData[i] : RData[i] << 8;
+ }
+ ac += (ac >> 16) & 0xFFFF;
+ this.keyTag = ac & 0XFFFF;
+
+ // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 = 16
+ // convert binary flags
+ let binFlags = this.flags.toString(2);
+ // add left padding until 16 chars
+ while (binFlags.length < 16) {
+ binFlags = '0' + binFlags;
+ }
+ this.zoneKey = binFlags[7] === '1';
+ this.zoneSep = binFlags[15] === '1';
+ this.key = Buffer.from(RData.slice(4)).toString('base64');
+ return this;
+ },
+ encode: function(record, writer) {
+ writer = writer || new Packet.Writer();
+ const buffer = Buffer.from(record.key, 'base64');
+ writer.write(4 + buffer.length, 16);
+ writer.write(record.flags, 16);
+ writer.write(record.protocol, 8);
+ writer.write(record.algorithm, 8);
+ buffer.forEach(function(c) {
+ writer.write(c, 8);
+ });
+ return writer.toBuffer();
+ },
+};
+
 Packet.Reader = BufferReader;
 Packet.Writer = BufferWriter;
 

test/index.js

@@ -149,6 +149,21 @@ test('Packet#encode', function() {
  domain : 'sfo1.lsong.org',
  });
 
+ // DNS KEY
+ response.answers.push({
+ name : 'lsong.org',
+ ttl : 300,
+ type : 48,
+ class : 1,
+ flags : 256,
+ protocol : 3,
+ algorithm : 13,
+ keyTag : 1721,
+ zoneKey : true,
+ zoneSep : false,
+ key : 'PM8S6PI0Gf8d3HK9gHSVpW3X3zeieMEa+PLCijFuaFgiIANdUQen5xNn0/9+eo3E4VIJGU27lk6q4xXqMuQl7A==',
+ });
+
  response.authorities.push({
  name : 'lsong.org',
  type : Packet.TYPE.MX,