Index: frontend/node_modules/dns-packet/README.md
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+# dns-packet
+[![](https://img.shields.io/npm/v/dns-packet.svg?style=flat)](https://www.npmjs.org/package/dns-packet) [![](https://img.shields.io/npm/dm/dns-packet.svg)](https://www.npmjs.org/package/dns-packet) [![](https://github.com/github/mafintosh/dns-packet/workflows/ci.yml/badge.svg)](https://github.com/github/mafintosh/dns-packet/workflows/ci.yml) [![Coverage Status](https://coveralls.io/repos/github/mafintosh/dns-packet/badge.svg?branch=master)](https://coveralls.io/github/mafintosh/dns-packet?branch=master)
+
+An [abstract-encoding](https://github.com/mafintosh/abstract-encoding) compliant module for encoding / decoding DNS packets. Lifted out of [multicast-dns](https://github.com/mafintosh/multicast-dns) as a separate module.
+
+```
+npm install dns-packet
+```
+
+## UDP Usage
+
+``` js
+const dnsPacket = require('dns-packet')
+const dgram = require('dgram')
+
+const socket = dgram.createSocket('udp4')
+
+const buf = dnsPacket.encode({
+  type: 'query',
+  id: 1,
+  flags: dnsPacket.RECURSION_DESIRED,
+  questions: [{
+    type: 'A',
+    name: 'google.com'
+  }]
+})
+
+socket.on('message', message => {
+  console.log(dnsPacket.decode(message)) // prints out a response from google dns
+})
+
+socket.send(buf, 0, buf.length, 53, '8.8.8.8')
+```
+
+Also see [the UDP example](examples/udp.js).
+
+## TCP, TLS, HTTPS
+
+While DNS has traditionally been used over a datagram transport, it is increasingly being carried over TCP for larger responses commonly including DNSSEC responses and TLS or HTTPS for enhanced security. See below examples on how to use `dns-packet` to wrap DNS packets in these protocols:
+
+- [TCP](examples/tcp.js)
+- [DNS over TLS](examples/tls.js)
+- [DNS over HTTPS](examples/doh.js)
+
+## API
+
+#### `var buf = packets.encode(packet, [buf], [offset])`
+
+Encodes a DNS packet into a buffer containing a UDP payload.
+
+#### `var packet = packets.decode(buf, [offset])`
+
+Decode a DNS packet from a buffer containing a UDP payload.
+
+#### `var buf = packets.streamEncode(packet, [buf], [offset])`
+
+Encodes a DNS packet into a buffer containing a TCP payload.
+
+#### `var packet = packets.streamDecode(buf, [offset])`
+
+Decode a DNS packet from a buffer containing a TCP payload.
+
+#### `var len = packets.encodingLength(packet)`
+
+Returns how many bytes are needed to encode the DNS packet
+
+## Packets
+
+Packets look like this
+
+``` js
+{
+  type: 'query|response',
+  id: optionalIdNumber,
+  flags: optionalBitFlags,
+  questions: [...],
+  answers: [...],
+  additionals: [...],
+  authorities: [...]
+}
+```
+
+The bit flags available are
+
+``` js
+packet.RECURSION_DESIRED
+packet.RECURSION_AVAILABLE
+packet.TRUNCATED_RESPONSE
+packet.AUTHORITATIVE_ANSWER
+packet.AUTHENTIC_DATA
+packet.CHECKING_DISABLED
+```
+
+To use more than one flag bitwise-or them together
+
+``` js
+var flags = packet.RECURSION_DESIRED | packet.RECURSION_AVAILABLE
+```
+
+And to check for a flag use bitwise-and
+
+``` js
+var isRecursive = message.flags & packet.RECURSION_DESIRED
+```
+
+A question looks like this
+
+``` js
+{
+  type: 'A', // or SRV, AAAA, etc
+  class: 'IN', // one of IN, CS, CH, HS, ANY. Default: IN
+  name: 'google.com' // which record are you looking for
+}
+```
+
+And an answer, additional, or authority looks like this
+
+``` js
+{
+  type: 'A', // or SRV, AAAA, etc
+  class: 'IN', // one of IN, CS, CH, HS
+  name: 'google.com', // which name is this record for
+  ttl: optionalTimeToLiveInSeconds,
+  (record specific data, see below)
+}
+```
+
+## Supported record types
+
+#### `A`
+
+``` js
+{
+  data: 'IPv4 address' // fx 127.0.0.1
+}
+```
+
+#### `AAAA`
+
+``` js
+{
+  data: 'IPv6 address' // fx fe80::1
+}
+```
+
+#### `CAA`
+
+``` js
+{
+  flags: 128, // octet
+  tag: 'issue|issuewild|iodef',
+  value: 'ca.example.net',
+  issuerCritical: false
+}
+```
+
+#### `CNAME`
+
+``` js
+{
+  data: 'cname.to.another.record'
+}
+```
+
+#### `DNAME`
+
+``` js
+{
+  data: 'dname.to.another.record'
+}
+```
+
+#### `DNSKEY`
+
+``` js
+{
+  flags: 257, // 16 bits
+  algorithm: 1, // octet
+  key: Buffer
+}
+```
+
+#### `DS`
+
+``` js
+{
+  keyTag: 12345,
+  algorithm: 8,
+  digestType: 1,
+  digest: Buffer
+}
+```
+
+#### `HINFO`
+
+``` js
+{
+  data: {
+    cpu: 'cpu info',
+    os: 'os info'
+  }
+}
+```
+
+#### `MX`
+
+``` js
+{
+  preference: 10,
+  exchange: 'mail.example.net'
+}
+```
+
+#### `NAPTR`
+
+``` js
+{
+  data:
+    {
+      order: 100,
+      preference: 10,
+      flags: 's',
+      services: 'SIP+D2U',
+      regexp: '!^.*$!sip:customer-service@example.com!',
+      replacement: '_sip._udp.example.com'
+    }
+}
+```
+
+#### `NS`
+
+``` js
+{
+  data: nameServer
+}
+```
+
+#### `NSEC`
+
+``` js
+{
+  nextDomain: 'a.domain',
+  rrtypes: ['A', 'TXT', 'RRSIG']
+}
+```
+
+#### `NSEC3`
+
+``` js
+{
+  algorithm: 1,
+  flags: 0,
+  iterations: 2,
+  salt: Buffer,
+  nextDomain: Buffer, // Hashed per RFC5155
+  rrtypes: ['A', 'TXT', 'RRSIG']
+}
+```
+
+#### `NULL`
+
+``` js
+{
+  data: Buffer('any binary data')
+}
+```
+
+#### `OPT`
+
+[EDNS0](https://tools.ietf.org/html/rfc6891) options.
+
+``` js
+{
+  type: 'OPT',
+  name: '.',
+  udpPayloadSize: 4096,
+  flags: packet.DNSSEC_OK,
+  options: [{
+    // pass in any code/data for generic EDNS0 options
+    code: 12,
+    data: Buffer.alloc(31)
+  }, {
+    // Several EDNS0 options have enhanced support
+    code: 'PADDING',
+    length: 31,
+  }, {
+    code: 'CLIENT_SUBNET',
+    family: 2, // 1 for IPv4, 2 for IPv6
+    sourcePrefixLength: 64, // used to truncate IP address
+    scopePrefixLength: 0,
+    ip: 'fe80::',
+  }, {
+    code: 'TCP_KEEPALIVE',
+    timeout: 150 // increments of 100ms.  This means 15s.
+  }, {
+    code: 'KEY_TAG',
+    tags: [1, 2, 3],
+  }]
+}
+```
+
+The options `PADDING`, `CLIENT_SUBNET`, `TCP_KEEPALIVE` and `KEY_TAG` support enhanced de/encoding. See [optionscodes.js](https://github.com/mafintosh/dns-packet/blob/master/optioncodes.js) for all supported option codes. If the `data` property is present on a option, it takes precedence. On decoding, `data` will always be defined.
+
+#### `PTR`
+
+``` js
+{
+  data: 'points.to.another.record'
+}
+```
+
+#### `RP`
+
+``` js
+{
+  mbox: 'admin.example.com',
+  txt: 'txt.example.com'
+}
+```
+
+#### `SSHFP`
+
+``` js
+{
+  algorithm: 1,
+  hash: 1,
+  fingerprint: 'A108C9F834354D5B37AF988141C9294822F5BC00'
+}
+````
+
+#### `RRSIG`
+
+``` js
+{
+  typeCovered: 'A',
+  algorithm: 8,
+  labels: 1,
+  originalTTL: 3600,
+  expiration: timestamp,
+  inception: timestamp,
+  keyTag: 12345,
+  signersName: 'a.name',
+  signature: Buffer
+}
+```
+
+#### `SOA`
+
+``` js
+{
+  data:
+    {
+      mname: domainName,
+      rname: mailbox,
+      serial: zoneSerial,
+      refresh: refreshInterval,
+      retry: retryInterval,
+      expire: expireInterval,
+      minimum: minimumTTL
+    }
+}
+```
+
+#### `SRV`
+
+``` js
+{
+  data: {
+    port: servicePort,
+    target: serviceHostName,
+    priority: optionalServicePriority,
+    weight: optionalServiceWeight
+  }
+}
+```
+
+#### `TLSA`
+
+``` js
+{
+  usage: 3,
+  selector: 1,
+  matchingType: 1,
+  certificate: Buffer
+}
+```
+
+#### `TXT`
+
+``` js
+{
+  data: 'text' || Buffer || [ Buffer || 'text' ]
+}
+```
+
+When encoding, scalar values are converted to an array and strings are converted to UTF-8 encoded Buffers. When decoding, the return value will always be an array of Buffer.
+
+If you need another record type, open an issue and we'll try to add it.
+
+## License
+
+MIT