111 lines
3.1 KiB
JavaScript
111 lines
3.1 KiB
JavaScript
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// Copyright 2012 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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var dgram = require('dgram'),
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EventEmitter = require('events').EventEmitter,
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net = require('net'),
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util = require('util');
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var is_absolute = exports.is_absolute = function (f) {
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return f && /\.$/.test(f);
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};
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var ensure_absolute = exports.ensure_absolute = function (f) {
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if (!is_absolute(f))
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return f += '.';
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return f;
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};
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var CNAME = require('native-dns-packet').consts.NAME_TO_QTYPE.CNAME;
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var Lookup = exports.Lookup = function (store, zone, question, cb) {
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if (!(this instanceof Lookup))
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return new Lookup(store, zone, question, cb);
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this.store = store;
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this.zone = zone;
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this.cb = cb;
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this.question = question;
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this.results = [];
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this.wildcard = undefined;
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this.name = ensure_absolute(question.name);
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this.store.get(this.zone, this.name, this.lookup.bind(this));
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};
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Lookup.prototype.send = function (err) {
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this.cb(err, this.results);
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};
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Lookup.prototype.lookup = function (err, results) {
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var type, ret, name, self = this;
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if (err)
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return this.send(err);
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if (!results) {
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if (!this.wildcard)
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this.wildcard = this.question.name;
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if (this.wildcard.toLowerCase() == this.zone.toLowerCase())
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return this.send();
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name = this.wildcard = this.wildcard.split('.').splice(1).join('.');
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// 'com.'.split('.').splice(1) will return empty string, we're at the end
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if (!this.wildcard)
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return this.send();
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name = '*.' + name;
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} else if (results[this.question.type]) {
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type = this.question.type;
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ret = results;
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} else if (results[CNAME]) {
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type = CNAME;
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ret = results;
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this.name = name = results[CNAME][0].data
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}
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if (ret) {
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ret = ret[type];
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ret.forEach(function (r) {
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var rr, k;
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if (self.wildcard && /^\*/.test(r.name)) {
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rr = {};
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for (k in r) {
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rr[k] = r[k];
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}
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rr.name = self.name;
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} else {
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rr = r;
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}
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self.results.push(rr);
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});
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}
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if (name)
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this.store.get(this.zone, ensure_absolute(name), this.lookup.bind(this));
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else
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this.send();
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};
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