698 lines
16 KiB
JavaScript
698 lines
16 KiB
JavaScript
// Copyright 2011 Timothy J Fontaine <tjfontaine@gmail.com>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE
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'use strict';
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var ipaddr = require('ipaddr.js'),
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net = require('net'),
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util = require('util'),
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EventEmitter = require('events').EventEmitter,
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PendingRequests = require('./pending'),
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Packet = require('./packet'),
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consts = require('native-dns-packet').consts,
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utils = require('./utils'),
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platform = require('./platform');
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var A = consts.NAME_TO_QTYPE.A,
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AAAA = consts.NAME_TO_QTYPE.AAAA,
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MX = consts.NAME_TO_QTYPE.MX,
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TXT = consts.NAME_TO_QTYPE.TXT,
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NS = consts.NAME_TO_QTYPE.NS,
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CNAME = consts.NAME_TO_QTYPE.CNAME,
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SRV = consts.NAME_TO_QTYPE.SRV,
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PTR = consts.NAME_TO_QTYPE.PTR,
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TLSA = consts.NAME_TO_QTYPE.TLSA;
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var debug = function() {};
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if (process.env.NODE_DEBUG && process.env.NODE_DEBUG.match(/dns/)) {
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debug = function debug() {
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var args = Array.prototype.slice.call(arguments);
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console.error.apply(this, ['client', Date.now().toString()].concat(args));
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};
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}
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var Request = exports.Request = function(opts) {
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if (!(this instanceof Request)) return new Request(opts);
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this.question = opts.question;
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this.server = opts.server;
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if (typeof(this.server) === 'string' || this.server instanceof String)
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this.server = { address: this.server, port: 53, type: 'udp'};
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if (!this.server || !this.server.address || !net.isIP(this.server.address))
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throw new Error('Server object must be supplied with at least address');
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if (!this.server.type || ['udp', 'tcp'].indexOf(this.server.type) === -1)
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this.server.type = 'udp';
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if (!this.server.port)
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this.server.port = 53;
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this.timeout = opts.timeout || 4 * 1000;
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this.try_edns = opts.try_edns || false;
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this.fired = false;
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this.id = undefined;
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if (opts.cache || opts.cache === false) {
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this.cache = opts.cache;
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} else {
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this.cache = platform.cache;
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}
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debug('request created', this.question);
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};
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util.inherits(Request, EventEmitter);
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Request.prototype.handle = function(err, answer, cached) {
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if (!this.fired) {
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debug('request handled', this.id, this.question);
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if (!cached && this.cache && this.cache.store && answer) {
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this.cache.store(answer);
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}
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this.emit('message', err, answer);
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this.done();
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}
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};
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Request.prototype.done = function() {
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debug('request finished', this.id, this.question);
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this.fired = true;
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clearTimeout(this.timer_);
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PendingRequests.remove(this);
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this.emit('end');
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this.id = undefined;
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};
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Request.prototype.handleTimeout = function() {
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if (!this.fired) {
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debug('request timedout', this.id, this.question);
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this.emit('timeout');
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this.done();
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}
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};
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Request.prototype.error = function(err) {
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if (!this.fired) {
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debug('request error', err, this.id, this.question);
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this.emit('error', err);
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this.done();
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}
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};
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Request.prototype.send = function() {
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debug('request starting', this.question);
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var self = this;
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if (this.cache && this.cache.lookup) {
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this.cache.lookup(this.question, function(results) {
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var packet;
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if (!results) {
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self._send();
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} else {
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packet = new Packet();
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packet.answer = results.slice();
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self.handle(null, packet, true);
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}
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});
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} else {
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this._send();
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}
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};
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Request.prototype._send = function() {
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debug('request not in cache', this.question);
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var self = this;
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this.timer_ = setTimeout(function() {
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self.handleTimeout();
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}, this.timeout);
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PendingRequests.send(self);
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};
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Request.prototype.cancel = function() {
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debug('request cancelled', this.id, this.question);
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this.emit('cancelled');
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this.done();
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};
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var _queue = [];
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var sendQueued = function() {
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debug('platform ready sending queued requests');
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_queue.forEach(function(request) {
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request.start();
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});
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_queue = [];
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};
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platform.on('ready', function() {
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sendQueued();
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});
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if (platform.ready) {
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sendQueued();
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}
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var Resolve = function Resolve(opts, cb) {
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if (!(this instanceof Resolve)) return new Resolve(opts, cb);
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this.opts = util._extend({
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retryOnTruncate: true,
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}, opts);
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this._domain = opts.domain;
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this._rrtype = opts.rrtype;
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this._buildQuestion(this._domain);
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this._started = false;
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this._current_server = undefined;
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this._server_list = [];
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if (opts.remote) {
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this._server_list.push({
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address: opts.remote,
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port: 53,
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type: 'tcp',
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});
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this._server_list.push({
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address: opts.remote,
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port: 53,
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type: 'udp',
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});
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}
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this._request = undefined;
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this._type = 'getHostByName';
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this._cb = cb;
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if (!platform.ready) {
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_queue.push(this);
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} else {
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this.start();
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}
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};
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util.inherits(Resolve, EventEmitter);
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Resolve.prototype.cancel = function() {
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if (this._request) {
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this._request.cancel();
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}
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};
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Resolve.prototype._buildQuestion = function(name) {
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debug('building question', name);
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this.question = {
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type: this._rrtype,
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class: consts.NAME_TO_QCLASS.IN,
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name: name
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};
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};
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exports.Resolve = Resolve;
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Resolve.prototype._emit = function(err, answer) {
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debug('resolve end', this._domain);
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var self = this;
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process.nextTick(function() {
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if (err) {
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err.syscall = self._type;
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}
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self._cb(err, answer);
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});
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};
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Resolve.prototype._fillServers = function() {
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debug('resolve filling servers', this._domain);
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var tries = 0, s, t, u, slist;
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slist = platform.name_servers;
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while (this._server_list.length < platform.attempts) {
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s = slist[tries % slist.length];
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u = {
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address: s.address,
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port: s.port,
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type: 'udp'
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};
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t = {
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address: s.address,
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port: s.port,
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type: 'tcp'
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};
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this._server_list.push(u);
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this._server_list.push(t);
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tries += 1;
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}
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this._server_list.reverse();
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};
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Resolve.prototype._popServer = function() {
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debug('resolve pop server', this._current_server, this._domain);
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this._server_list.splice(0, 1, this._current_server);
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};
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Resolve.prototype._preStart = function() {
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if (!this._started) {
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this._started = new Date().getTime();
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this.try_edns = platform.edns;
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if (!this._server_list.length)
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this._fillServers();
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}
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};
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Resolve.prototype._shouldContinue = function() {
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debug('resolve should continue', this._server_list.length, this._domain);
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return this._server_list.length;
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};
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Resolve.prototype._nextQuestion = function() {
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debug('resolve next question', this._domain);
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};
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Resolve.prototype.start = function() {
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if (!this._started) {
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this._preStart();
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}
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if (this._server_list.length === 0) {
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debug('resolve no more servers', this._domain);
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this.handleTimeout();
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} else {
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this._current_server = this._server_list.pop();
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debug('resolve start', this._current_server, this._domain);
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this._request = Request({
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question: this.question,
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server: this._current_server,
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timeout: platform.timeout,
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try_edns: this.try_edns
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});
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this._request.on('timeout', this._handleTimeout.bind(this));
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this._request.on('message', this._handle.bind(this));
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this._request.on('error', this._handle.bind(this));
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this._request.send();
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}
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};
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var NOERROR = consts.NAME_TO_RCODE.NOERROR,
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SERVFAIL = consts.NAME_TO_RCODE.SERVFAIL,
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NOTFOUND = consts.NAME_TO_RCODE.NOTFOUND,
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FORMERR = consts.NAME_TO_RCODE.FORMERR;
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Resolve.prototype._handle = function(err, answer) {
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var rcode, errno;
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if (answer) {
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rcode = answer.header.rcode;
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}
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debug('resolve handle', rcode, this._domain);
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switch (rcode) {
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case NOERROR:
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// answer trucated retry with tcp
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//console.log(answer);
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if (answer.header.tc &&
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this.opts.retryOnTruncate &&
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this._shouldContinue()) {
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debug('truncated', this._domain, answer);
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this.emit('truncated', err, answer);
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// remove udp servers
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this._server_list = this._server_list.filter(function(server) {
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return server.type === 'tcp';
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});
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answer = undefined;
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}
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break;
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case SERVFAIL:
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if (this._shouldContinue()) {
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this._nextQuestion();
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//this._popServer();
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} else {
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errno = consts.SERVFAIL;
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}
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answer = undefined;
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break;
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case NOTFOUND:
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if (this._shouldContinue()) {
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this._nextQuestion();
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} else {
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errno = consts.NOTFOUND;
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}
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answer = undefined;
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break;
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case FORMERR:
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if (this.try_edns) {
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this.try_edns = false;
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//this._popServer();
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} else {
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errno = consts.FORMERR;
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}
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answer = undefined;
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break;
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default:
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if (!err) {
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errno = consts.RCODE_TO_NAME[rcode];
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answer = undefined;
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} else {
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errno = consts.NOTFOUND;
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}
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break;
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}
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if (errno || answer) {
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if (errno) {
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err = new Error(this._type + ' ' + errno);
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err.errno = err.code = errno;
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}
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this._emit(err, answer);
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} else {
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this.start();
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}
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};
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Resolve.prototype._handleTimeout = function() {
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var err;
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if (this._server_list.length === 0) {
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debug('resolve timeout no more servers', this._domain);
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err = new Error(this._type + ' ' + consts.TIMEOUT);
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err.errno = consts.TIMEOUT;
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this._emit(err, undefined);
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} else {
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debug('resolve timeout continue', this._domain);
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this.start();
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}
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};
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var resolve = function(domain, rrtype, ip, callback) {
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var res;
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if (!callback) {
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callback = ip;
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ip = undefined;
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}
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if (!callback) {
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callback = rrtype;
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rrtype = undefined;
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}
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rrtype = consts.NAME_TO_QTYPE[rrtype || 'A'];
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if (rrtype === PTR) {
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return reverse(domain, callback);
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}
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var opts = {
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domain: domain,
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rrtype: rrtype,
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remote: ip,
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};
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res = new Resolve(opts);
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res._cb = function(err, response) {
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var ret = [], i, a;
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if (err) {
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callback(err, response);
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return;
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}
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for (i = 0; i < response.answer.length; i++) {
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a = response.answer[i];
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if (a.type === rrtype) {
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switch (rrtype) {
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case A:
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case AAAA:
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ret.push(a.address);
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break;
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case consts.NAME_TO_QTYPE.MX:
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ret.push({
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priority: a.priority,
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exchange: a.exchange
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});
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break;
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case TXT:
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case NS:
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case CNAME:
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case PTR:
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ret.push(a.data);
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break;
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case SRV:
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ret.push({
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priority: a.priority,
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weight: a.weight,
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port: a.port,
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name: a.target
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});
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break;
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default:
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ret.push(a);
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break;
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}
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}
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}
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if (ret.length === 0) {
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ret = undefined;
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}
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callback(err, ret);
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};
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return res;
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};
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exports.resolve = resolve;
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var resolve4 = function(domain, callback) {
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return resolve(domain, 'A', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolve4 = resolve4;
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var resolve6 = function(domain, callback) {
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return resolve(domain, 'AAAA', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolve6 = resolve6;
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var resolveMx = function(domain, callback) {
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return resolve(domain, 'MX', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolveMx = resolveMx;
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var resolveTxt = function(domain, callback) {
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return resolve(domain, 'TXT', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolveTxt = resolveTxt;
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var resolveSrv = function(domain, callback) {
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return resolve(domain, 'SRV', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolveSrv = resolveSrv;
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var resolveNs = function(domain, callback) {
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return resolve(domain, 'NS', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolveNs = resolveNs;
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var resolveCname = function(domain, callback) {
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return resolve(domain, 'CNAME', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolveCname = resolveCname;
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var resolveTlsa = function(domain, callback) {
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return resolve(domain, 'TLSA', function(err, results) {
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callback(err, results);
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});
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};
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exports.resolveTlsa = resolveTlsa;
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var reverse = function(ip, callback) {
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var error, opts, res;
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if (!net.isIP(ip)) {
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error = new Error('getHostByAddr ENOTIMP');
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error.errno = error.code = 'ENOTIMP';
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throw error;
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}
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opts = {
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domain: utils.reverseIP(ip),
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rrtype: PTR
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};
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res = new Lookup(opts);
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res._cb = function(err, response) {
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var results = [];
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if (response) {
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response.answer.forEach(function(a) {
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if (a.type === PTR) {
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results.push(a.data);
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}
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});
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}
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if (results.length === 0) {
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results = undefined;
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}
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callback(err, results);
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};
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return res;
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};
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exports.reverse = reverse;
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var Lookup = function(opts) {
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Resolve.call(this, opts);
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this._type = 'getaddrinfo';
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};
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util.inherits(Lookup, Resolve);
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Lookup.prototype.start = function() {
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var self = this;
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if (!this._started) {
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this._search_path = platform.search_path.slice(0);
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this._preStart();
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}
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platform.hosts.lookup(this.question, function(results) {
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var packet;
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if (results && results.length) {
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debug('Lookup in hosts', results);
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packet = new Packet();
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packet.answer = results.slice();
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self._emit(null, packet);
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} else {
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debug('Lookup not in hosts');
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Resolve.prototype.start.call(self);
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}
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});
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};
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Lookup.prototype._shouldContinue = function() {
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debug('Lookup should continue', this._server_list.length,
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this._search_path.length);
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return this._server_list.length && this._search_path.length;
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};
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Lookup.prototype._nextQuestion = function() {
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debug('Lookup next question');
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this._buildQuestion([this._domain, this._search_path.pop()].join('.'));
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};
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var lookup = function(domain, family, callback) {
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var rrtype, revip, res;
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if (!callback) {
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callback = family;
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family = undefined;
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}
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if (!family) {
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family = 4;
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}
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revip = net.isIP(domain);
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|
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if (revip === 4 || revip === 6) {
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process.nextTick(function() {
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callback(null, domain, revip);
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});
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|
return {};
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}
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|
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if (!domain) {
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process.nextTick(function() {
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callback(null, null, family);
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});
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|
return {};
|
|
}
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|
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rrtype = consts.FAMILY_TO_QTYPE[family];
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|
|
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var opts = {
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domain: domain,
|
|
rrtype: rrtype
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};
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|
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res = new Lookup(opts);
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|
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res._cb = function(err, response) {
|
|
var i, afamily, address, a, all;
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|
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if (err) {
|
|
callback(err, undefined, undefined);
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|
return;
|
|
}
|
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|
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all = response.answer.concat(response.additional);
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|
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for (i = 0; i < all.length; i++) {
|
|
a = all[i];
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|
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if (a.type === A || a.type === AAAA) {
|
|
afamily = consts.QTYPE_TO_FAMILY[a.type];
|
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address = a.address;
|
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break;
|
|
}
|
|
}
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|
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callback(err, address, afamily);
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};
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|
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return res;
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};
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exports.lookup = lookup;
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