764 lines
17 KiB
JavaScript
764 lines
17 KiB
JavaScript
var types = require('./types')
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var rcodes = require('./rcodes')
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var opcodes = require('./opcodes')
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var ip = require('ip')
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var Buffer = require('safe-buffer').Buffer
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var QUERY_FLAG = 0
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var RESPONSE_FLAG = 1 << 15
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var FLUSH_MASK = 1 << 15
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var NOT_FLUSH_MASK = ~FLUSH_MASK
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var QU_MASK = 1 << 15
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var NOT_QU_MASK = ~QU_MASK
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var name = exports.txt = exports.name = {}
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name.encode = function (str, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(name.encodingLength(str))
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if (!offset) offset = 0
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var oldOffset = offset
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// strip leading and trailing .
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var n = str.replace(/^\.|\.$/gm, '')
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if (n.length) {
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var list = n.split('.')
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for (var i = 0; i < list.length; i++) {
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var len = buf.write(list[i], offset + 1)
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buf[offset] = len
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offset += len + 1
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}
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}
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buf[offset++] = 0
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name.encode.bytes = offset - oldOffset
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return buf
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}
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name.encode.bytes = 0
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name.decode = function (buf, offset) {
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if (!offset) offset = 0
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var list = []
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var oldOffset = offset
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var len = buf[offset++]
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if (len === 0) {
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name.decode.bytes = 1
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return '.'
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}
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if (len >= 0xc0) {
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var res = name.decode(buf, buf.readUInt16BE(offset - 1) - 0xc000)
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name.decode.bytes = 2
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return res
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}
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while (len) {
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if (len >= 0xc0) {
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list.push(name.decode(buf, buf.readUInt16BE(offset - 1) - 0xc000))
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offset++
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break
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}
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list.push(buf.toString('utf-8', offset, offset + len))
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offset += len
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len = buf[offset++]
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}
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name.decode.bytes = offset - oldOffset
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return list.join('.')
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}
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name.decode.bytes = 0
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name.encodingLength = function (n) {
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return Buffer.byteLength(n) + 2
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}
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var string = {}
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string.encode = function (s, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(string.encodingLength(s))
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if (!offset) offset = 0
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var len = buf.write(s, offset + 1)
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buf[offset] = len
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string.encode.bytes = len + 1
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return buf
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}
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string.encode.bytes = 0
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string.decode = function (buf, offset) {
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if (!offset) offset = 0
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var len = buf[offset]
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var s = buf.toString('utf-8', offset + 1, offset + 1 + len)
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string.decode.bytes = len + 1
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return s
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}
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string.decode.bytes = 0
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string.encodingLength = function (s) {
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return Buffer.byteLength(s) + 1
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}
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var header = {}
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header.encode = function (h, buf, offset) {
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if (!buf) buf = header.encodingLength(h)
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if (!offset) offset = 0
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var flags = (h.flags || 0) & 32767
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var type = h.type === 'response' ? RESPONSE_FLAG : QUERY_FLAG
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buf.writeUInt16BE(h.id || 0, offset)
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buf.writeUInt16BE(flags | type, offset + 2)
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buf.writeUInt16BE(h.questions.length, offset + 4)
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buf.writeUInt16BE(h.answers.length, offset + 6)
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buf.writeUInt16BE(h.authorities.length, offset + 8)
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buf.writeUInt16BE(h.additionals.length, offset + 10)
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return buf
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}
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header.encode.bytes = 12
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header.decode = function (buf, offset) {
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if (!offset) offset = 0
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if (buf.length < 12) throw new Error('Header must be 12 bytes')
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var flags = buf.readUInt16BE(offset + 2)
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return {
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id: buf.readUInt16BE(offset),
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type: flags & RESPONSE_FLAG ? 'response' : 'query',
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flags: flags & 32767,
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flag_qr: ((flags >> 15) & 0x1) === 1,
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opcode: opcodes.toString((flags >> 11) & 0xf),
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flag_auth: ((flags >> 10) & 0x1) === 1,
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flag_trunc: ((flags >> 9) & 0x1) === 1,
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flag_rd: ((flags >> 8) & 0x1) === 1,
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flag_ra: ((flags >> 7) & 0x1) === 1,
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flag_z: ((flags >> 6) & 0x1) === 1,
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flag_ad: ((flags >> 5) & 0x1) === 1,
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flag_cd: ((flags >> 4) & 0x1) === 1,
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rcode: rcodes.toString(flags & 0xf),
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questions: new Array(buf.readUInt16BE(offset + 4)),
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answers: new Array(buf.readUInt16BE(offset + 6)),
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authorities: new Array(buf.readUInt16BE(offset + 8)),
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additionals: new Array(buf.readUInt16BE(offset + 10))
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}
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}
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header.decode.bytes = 12
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header.encodingLength = function () {
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return 12
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}
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var runknown = exports.unknown = {}
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runknown.encode = function (data, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(runknown.encodingLength(data))
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if (!offset) offset = 0
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buf.writeUInt16BE(data.length, offset)
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data.copy(buf, offset + 2)
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runknown.encode.bytes = data.length + 2
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return buf
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}
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runknown.encode.bytes = 0
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runknown.decode = function (buf, offset) {
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if (!offset) offset = 0
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var len = buf.readUInt16BE(offset)
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var data = buf.slice(offset + 2, offset + 2 + len)
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runknown.decode.bytes = len + 2
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return data
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}
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runknown.decode.bytes = 0
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runknown.encodingLength = function (data) {
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return data.length + 2
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}
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var rns = exports.ns = {}
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rns.encode = function (data, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(rns.encodingLength(data))
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if (!offset) offset = 0
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name.encode(data, buf, offset + 2)
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buf.writeUInt16BE(name.encode.bytes, offset)
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rns.encode.bytes = name.encode.bytes + 2
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return buf
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}
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rns.encode.bytes = 0
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rns.decode = function (buf, offset) {
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if (!offset) offset = 0
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var len = buf.readUInt16BE(offset)
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var dd = name.decode(buf, offset + 2)
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rns.decode.bytes = len + 2
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return dd
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}
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rns.decode.bytes = 0
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rns.encodingLength = function (data) {
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return name.encodingLength(data) + 2
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}
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var rsoa = exports.soa = {}
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rsoa.encode = function (data, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(rsoa.encodingLength(data))
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if (!offset) offset = 0
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var oldOffset = offset
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offset += 2
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name.encode(data.mname, buf, offset)
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offset += name.encode.bytes
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name.encode(data.rname, buf, offset)
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offset += name.encode.bytes
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buf.writeUInt32BE(data.serial || 0, offset)
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offset += 4
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buf.writeUInt32BE(data.refresh || 0, offset)
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offset += 4
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buf.writeUInt32BE(data.retry || 0, offset)
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offset += 4
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buf.writeUInt32BE(data.expire || 0, offset)
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offset += 4
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buf.writeUInt32BE(data.minimum || 0, offset)
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offset += 4
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buf.writeUInt16BE(offset - oldOffset - 2, oldOffset)
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rsoa.encode.bytes = offset - oldOffset
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return buf
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}
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rsoa.encode.bytes = 0
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rsoa.decode = function (buf, offset) {
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if (!offset) offset = 0
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var oldOffset = offset
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var data = {}
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offset += 2
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data.mname = name.decode(buf, offset)
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offset += name.decode.bytes
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data.rname = name.decode(buf, offset)
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offset += name.decode.bytes
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data.serial = buf.readUInt32BE(offset)
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offset += 4
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data.refresh = buf.readUInt32BE(offset)
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offset += 4
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data.retry = buf.readUInt32BE(offset)
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offset += 4
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data.expire = buf.readUInt32BE(offset)
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offset += 4
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data.minimum = buf.readUInt32BE(offset)
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offset += 4
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rsoa.decode.bytes = offset - oldOffset
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return data
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}
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rsoa.decode.bytes = 0
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rsoa.encodingLength = function (data) {
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return 22 + name.encodingLength(data.mname) + name.encodingLength(data.rname)
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}
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var rtxt = exports.txt = exports.null = {}
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var rnull = rtxt
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rtxt.encode = function (data, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(rtxt.encodingLength(data))
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if (!offset) offset = 0
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if (typeof data === 'string') data = Buffer.from(data)
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if (!data) data = Buffer.allocUnsafe(0)
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var oldOffset = offset
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offset += 2
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var len = data.length
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data.copy(buf, offset, 0, len)
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offset += len
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buf.writeUInt16BE(offset - oldOffset - 2, oldOffset)
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rtxt.encode.bytes = offset - oldOffset
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return buf
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}
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rtxt.encode.bytes = 0
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rtxt.decode = function (buf, offset) {
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if (!offset) offset = 0
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var oldOffset = offset
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var len = buf.readUInt16BE(offset)
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offset += 2
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var data = buf.slice(offset, offset + len)
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offset += len
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rtxt.decode.bytes = offset - oldOffset
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return data
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}
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rtxt.decode.bytes = 0
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rtxt.encodingLength = function (data) {
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if (!data) return 2
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return (Buffer.isBuffer(data) ? data.length : Buffer.byteLength(data)) + 2
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}
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var rhinfo = exports.hinfo = {}
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rhinfo.encode = function (data, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(rhinfo.encodingLength(data))
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if (!offset) offset = 0
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var oldOffset = offset
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offset += 2
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string.encode(data.cpu, buf, offset)
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offset += string.encode.bytes
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string.encode(data.os, buf, offset)
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offset += string.encode.bytes
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buf.writeUInt16BE(offset - oldOffset - 2, oldOffset)
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rhinfo.encode.bytes = offset - oldOffset
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return buf
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}
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rhinfo.encode.bytes = 0
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rhinfo.decode = function (buf, offset) {
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if (!offset) offset = 0
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var oldOffset = offset
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var data = {}
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offset += 2
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data.cpu = string.decode(buf, offset)
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offset += string.decode.bytes
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data.os = string.decode(buf, offset)
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offset += string.decode.bytes
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rhinfo.decode.bytes = offset - oldOffset
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return data
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}
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rhinfo.decode.bytes = 0
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rhinfo.encodingLength = function (data) {
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return string.encodingLength(data.cpu) + string.encodingLength(data.os) + 2
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}
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var rptr = exports.ptr = {}
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var rcname = exports.cname = rptr
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var rdname = exports.dname = rptr
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rptr.encode = function (data, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(rptr.encodingLength(data))
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if (!offset) offset = 0
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name.encode(data, buf, offset + 2)
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buf.writeUInt16BE(name.encode.bytes, offset)
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rptr.encode.bytes = name.encode.bytes + 2
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return buf
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}
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rptr.encode.bytes = 0
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rptr.decode = function (buf, offset) {
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if (!offset) offset = 0
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var data = name.decode(buf, offset + 2)
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rptr.decode.bytes = name.decode.bytes + 2
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return data
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}
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rptr.decode.bytes = 0
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rptr.encodingLength = function (data) {
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return name.encodingLength(data) + 2
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}
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var rsrv = exports.srv = {}
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rsrv.encode = function (data, buf, offset) {
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if (!buf) buf = Buffer.allocUnsafe(rsrv.encodingLength(data))
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if (!offset) offset = 0
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buf.writeUInt16BE(data.priority || 0, offset + 2)
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buf.writeUInt16BE(data.weight || 0, offset + 4)
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buf.writeUInt16BE(data.port || 0, offset + 6)
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name.encode(data.target, buf, offset + 8)
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var len = name.encode.bytes + 6
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buf.writeUInt16BE(len, offset)
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rsrv.encode.bytes = len + 2
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return buf
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}
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rsrv.encode.bytes = 0
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rsrv.decode = function (buf, offset) {
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if (!offset) offset = 0
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var len = buf.readUInt16BE(offset)
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var data = {}
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data.priority = buf.readUInt16BE(offset + 2)
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data.weight = buf.readUInt16BE(offset + 4)
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data.port = buf.readUInt16BE(offset + 6)
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data.target = name.decode(buf, offset + 8)
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rsrv.decode.bytes = len + 2
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return data
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}
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rsrv.decode.bytes = 0
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rsrv.encodingLength = function (data) {
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return 8 + name.encodingLength(data.target)
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}
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var rcaa = exports.caa = {}
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rcaa.ISSUER_CRITICAL = 1 << 7
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rcaa.encode = function (data, buf, offset) {
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var len = rcaa.encodingLength(data)
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if (!buf) buf = Buffer.allocUnsafe(rcaa.encodingLength(data))
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if (!offset) offset = 0
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if (data.issuerCritical) {
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data.flags = rcaa.ISSUER_CRITICAL
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}
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buf.writeUInt16BE(len - 2, offset)
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offset += 2
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buf.writeUInt8(data.flags || 0, offset)
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offset += 1
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string.encode(data.tag, buf, offset)
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offset += string.encode.bytes
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buf.write(data.value, offset)
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offset += Buffer.byteLength(data.value)
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|
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rcaa.encode.bytes = len
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return buf
|
|
}
|
|
|
|
rcaa.encode.bytes = 0
|
|
|
|
rcaa.decode = function (buf, offset) {
|
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if (!offset) offset = 0
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|
|
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var len = buf.readUInt16BE(offset)
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offset += 2
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|
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var oldOffset = offset
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var data = {}
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data.flags = buf.readUInt8(offset)
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offset += 1
|
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data.tag = string.decode(buf, offset)
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offset += string.decode.bytes
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data.value = buf.toString('utf-8', offset, oldOffset + len)
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|
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data.issuerCritical = !!(data.flags & rcaa.ISSUER_CRITICAL)
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|
|
rcaa.decode.bytes = len + 2
|
|
|
|
return data
|
|
}
|
|
|
|
rcaa.decode.bytes = 0
|
|
|
|
rcaa.encodingLength = function (data) {
|
|
return string.encodingLength(data.tag) + string.encodingLength(data.value) + 2
|
|
}
|
|
|
|
var ra = exports.a = {}
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|
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ra.encode = function (host, buf, offset) {
|
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if (!buf) buf = Buffer.allocUnsafe(ra.encodingLength(host))
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if (!offset) offset = 0
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|
|
|
buf.writeUInt16BE(4, offset)
|
|
offset += 2
|
|
ip.toBuffer(host, buf, offset)
|
|
ra.encode.bytes = 6
|
|
return buf
|
|
}
|
|
|
|
ra.encode.bytes = 0
|
|
|
|
ra.decode = function (buf, offset) {
|
|
if (!offset) offset = 0
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|
|
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offset += 2
|
|
var host = ip.toString(buf, offset, 4)
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|
ra.decode.bytes = 6
|
|
return host
|
|
}
|
|
|
|
ra.decode.bytes = 0
|
|
|
|
ra.encodingLength = function () {
|
|
return 6
|
|
}
|
|
|
|
var raaaa = exports.aaaa = {}
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|
|
raaaa.encode = function (host, buf, offset) {
|
|
if (!buf) buf = Buffer.allocUnsafe(raaaa.encodingLength(host))
|
|
if (!offset) offset = 0
|
|
|
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buf.writeUInt16BE(16, offset)
|
|
offset += 2
|
|
ip.toBuffer(host, buf, offset)
|
|
raaaa.encode.bytes = 18
|
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return buf
|
|
}
|
|
|
|
raaaa.encode.bytes = 0
|
|
|
|
raaaa.decode = function (buf, offset) {
|
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if (!offset) offset = 0
|
|
|
|
offset += 2
|
|
var host = ip.toString(buf, offset, 16)
|
|
raaaa.decode.bytes = 18
|
|
return host
|
|
}
|
|
|
|
raaaa.decode.bytes = 0
|
|
|
|
raaaa.encodingLength = function () {
|
|
return 18
|
|
}
|
|
|
|
var renc = exports.record = function (type) {
|
|
switch (type.toUpperCase()) {
|
|
case 'A': return ra
|
|
case 'PTR': return rptr
|
|
case 'CNAME': return rcname
|
|
case 'DNAME': return rdname
|
|
case 'TXT': return rtxt
|
|
case 'NULL': return rnull
|
|
case 'AAAA': return raaaa
|
|
case 'SRV': return rsrv
|
|
case 'HINFO': return rhinfo
|
|
case 'CAA': return rcaa
|
|
case 'NS': return rns
|
|
case 'SOA': return rsoa
|
|
}
|
|
return runknown
|
|
}
|
|
|
|
var answer = exports.answer = {}
|
|
|
|
answer.encode = function (a, buf, offset) {
|
|
if (!buf) buf = Buffer.allocUnsafe(answer.encodingLength(a))
|
|
if (!offset) offset = 0
|
|
|
|
var oldOffset = offset
|
|
|
|
name.encode(a.name, buf, offset)
|
|
offset += name.encode.bytes
|
|
|
|
buf.writeUInt16BE(types.toType(a.type), offset)
|
|
|
|
var klass = a.class === undefined ? 1 : a.class
|
|
if (a.flush) klass |= FLUSH_MASK // the 1st bit of the class is the flush bit
|
|
buf.writeUInt16BE(klass, offset + 2)
|
|
|
|
buf.writeUInt32BE(a.ttl || 0, offset + 4)
|
|
|
|
var enc = renc(a.type)
|
|
enc.encode(a.data, buf, offset + 8)
|
|
offset += 8 + enc.encode.bytes
|
|
|
|
answer.encode.bytes = offset - oldOffset
|
|
return buf
|
|
}
|
|
|
|
answer.encode.bytes = 0
|
|
|
|
answer.decode = function (buf, offset) {
|
|
if (!offset) offset = 0
|
|
|
|
var a = {}
|
|
var oldOffset = offset
|
|
|
|
a.name = name.decode(buf, offset)
|
|
offset += name.decode.bytes
|
|
a.type = types.toString(buf.readUInt16BE(offset))
|
|
a.class = buf.readUInt16BE(offset + 2)
|
|
a.ttl = buf.readUInt32BE(offset + 4)
|
|
|
|
a.flush = !!(a.class & FLUSH_MASK)
|
|
if (a.flush) a.class &= NOT_FLUSH_MASK
|
|
|
|
var enc = renc(a.type)
|
|
a.data = enc.decode(buf, offset + 8)
|
|
offset += 8 + enc.decode.bytes
|
|
|
|
answer.decode.bytes = offset - oldOffset
|
|
return a
|
|
}
|
|
|
|
answer.decode.bytes = 0
|
|
|
|
answer.encodingLength = function (a) {
|
|
return name.encodingLength(a.name) + 8 + renc(a.type).encodingLength(a.data)
|
|
}
|
|
|
|
var question = exports.question = {}
|
|
|
|
question.encode = function (q, buf, offset) {
|
|
if (!buf) buf = Buffer.allocUnsafe(question.encodingLength(q))
|
|
if (!offset) offset = 0
|
|
|
|
var oldOffset = offset
|
|
|
|
name.encode(q.name, buf, offset)
|
|
offset += name.encode.bytes
|
|
|
|
buf.writeUInt16BE(types.toType(q.type), offset)
|
|
offset += 2
|
|
|
|
buf.writeUInt16BE(q.class === undefined ? 1 : q.class, offset)
|
|
offset += 2
|
|
|
|
question.encode.bytes = offset - oldOffset
|
|
return q
|
|
}
|
|
|
|
question.encode.bytes = 0
|
|
|
|
question.decode = function (buf, offset) {
|
|
if (!offset) offset = 0
|
|
|
|
var oldOffset = offset
|
|
var q = {}
|
|
|
|
q.name = name.decode(buf, offset)
|
|
offset += name.decode.bytes
|
|
|
|
q.type = types.toString(buf.readUInt16BE(offset))
|
|
offset += 2
|
|
|
|
q.class = buf.readUInt16BE(offset)
|
|
offset += 2
|
|
|
|
var qu = !!(q.class & QU_MASK)
|
|
if (qu) q.class &= NOT_QU_MASK
|
|
|
|
question.decode.bytes = offset - oldOffset
|
|
return q
|
|
}
|
|
|
|
question.decode.bytes = 0
|
|
|
|
question.encodingLength = function (q) {
|
|
return name.encodingLength(q.name) + 4
|
|
}
|
|
|
|
exports.AUTHORITATIVE_ANSWER = 1 << 10
|
|
exports.TRUNCATED_RESPONSE = 1 << 9
|
|
exports.RECURSION_DESIRED = 1 << 8
|
|
exports.RECURSION_AVAILABLE = 1 << 7
|
|
exports.AUTHENTIC_DATA = 1 << 5
|
|
exports.CHECKING_DISABLED = 1 << 4
|
|
|
|
exports.encode = function (result, buf, offset) {
|
|
if (!buf) buf = Buffer.allocUnsafe(exports.encodingLength(result))
|
|
if (!offset) offset = 0
|
|
|
|
var oldOffset = offset
|
|
|
|
if (!result.questions) result.questions = []
|
|
if (!result.answers) result.answers = []
|
|
if (!result.authorities) result.authorities = []
|
|
if (!result.additionals) result.additionals = []
|
|
|
|
header.encode(result, buf, offset)
|
|
offset += header.encode.bytes
|
|
|
|
offset = encodeList(result.questions, question, buf, offset)
|
|
offset = encodeList(result.answers, answer, buf, offset)
|
|
offset = encodeList(result.authorities, answer, buf, offset)
|
|
offset = encodeList(result.additionals, answer, buf, offset)
|
|
|
|
exports.encode.bytes = offset - oldOffset
|
|
|
|
return buf
|
|
}
|
|
|
|
exports.encode.bytes = 0
|
|
|
|
exports.decode = function (buf, offset) {
|
|
if (!offset) offset = 0
|
|
|
|
var oldOffset = offset
|
|
var result = header.decode(buf, offset)
|
|
offset += header.decode.bytes
|
|
|
|
offset = decodeList(result.questions, question, buf, offset)
|
|
offset = decodeList(result.answers, answer, buf, offset)
|
|
offset = decodeList(result.authorities, answer, buf, offset)
|
|
offset = decodeList(result.additionals, answer, buf, offset)
|
|
|
|
exports.decode.bytes = offset - oldOffset
|
|
|
|
return result
|
|
}
|
|
|
|
exports.decode.bytes = 0
|
|
|
|
exports.encodingLength = function (result) {
|
|
return header.encodingLength(result) +
|
|
encodingLengthList(result.questions || [], question) +
|
|
encodingLengthList(result.answers || [], answer) +
|
|
encodingLengthList(result.authorities || [], answer) +
|
|
encodingLengthList(result.additionals || [], answer)
|
|
}
|
|
|
|
function encodingLengthList (list, enc) {
|
|
var len = 0
|
|
for (var i = 0; i < list.length; i++) len += enc.encodingLength(list[i])
|
|
return len
|
|
}
|
|
|
|
function encodeList (list, enc, buf, offset) {
|
|
for (var i = 0; i < list.length; i++) {
|
|
enc.encode(list[i], buf, offset)
|
|
offset += enc.encode.bytes
|
|
}
|
|
return offset
|
|
}
|
|
|
|
function decodeList (list, enc, buf, offset) {
|
|
for (var i = 0; i < list.length; i++) {
|
|
list[i] = enc.decode(buf, offset)
|
|
offset += enc.decode.bytes
|
|
}
|
|
return offset
|
|
}
|