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/*
* Copyright (c) 2019-2022 David Timber <dxdt@dev.snart.me>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
export class Resolver {
async resolve (type, rname) {} // abstract
};
function getRTypeNum (typestrd) {
switch (typestrd) {
case 'A': return 1;
case 'AAAA': return 28;
case 'MX': return 15;
}
throw new Error();
}
export class GooglePublicDNSResolver {
_mk_query_url (type, rname) {
return `https://dns.google/resolve?name=${rname}&type=${type}`;
}
async _resolve_inner (url) {
let rsp;
for (let i = 0; i < 3; i += 1) {
rsp = await fetch(url);
if (rsp.status / 100 === 5) {
await new Promise(r => setTimeout(r, 500));
continue;
}
break;
}
return rsp;
}
async resolve (type, rname) {
if (!rname.endsWith('.')) {
rname += '.';
}
const url = this._mk_query_url(type, rname);
const rsp = await this._resolve_inner(url);
const doc = await rsp.json();
const nrtype = getRTypeNum(type);
let ret = [];
if ('Answer' in doc) {
for (const rr of doc['Answer']) {
// ignore other extra answers like CNAME
if ('data' in rr &&
'name' in rr &&
'type' in rr &&
rr['name'] === rname &&
rr['type'] === nrtype)
{
ret.push(rr['data']);
}
}
}
return ret;
}
};
export function parseList (txt) {
let ret = [];
const lines = txt.split(/[\r\n]+/gm);
for (let l of lines) {
l = l.trim();
const d = l.search('#');
if (d >= 0) {
l = l.substring(0, d).trim();
}
if (l) {
ret.push(l);
}
}
return ret;
};
const defaultResolver = GooglePublicDNSResolver;
export class ResolveMXAAAA {
constructor (onresolve) {
this.onresolve = onresolve;
}
async doResolve (list, resolver = null) {
let ret = {
mxmap: {},
counts: {
list: list.length,
mx: 0,
has_a: 0,
has_aaaa: 0
}
};
if (!resolver) {
resolver = new defaultResolver();
}
// init the map
for (const domain of list) {
ret.mxmap[domain] = {
mx: [],
amap: {},
acnt: 0,
aaaamap: {},
aaaacnt: 0
};
}
// Get all MX
let i = 0;
for (const domain of list) {
const q_mx = await resolver.resolve('MX', domain);
let has_a = 0, has_aaaa = 0;
this.onresolve('start', { domain: domain }, ret);
for (let mx of q_mx) {
// don't need the number part
const d = mx.search(/\s+/);
if (d > 0) {
mx = mx.substring(d).trim();
}
ret.mxmap[domain].mx.push(mx);
ret.counts.mx += 1;
this.onresolve('mx', {
domain: domain,
mx: mx
}, ret);
// Resolve all A of MX
const q_a = await resolver.resolve('A', mx);
if (q_a.length) {
has_a = 1;
ret.mxmap[domain].acnt += 1;
}
ret.mxmap[domain].amap[mx] = q_a;
this.onresolve('a', {
domain: domain,
mx: mx,
a: q_a
}, ret);
// Resolve all AAAA of MX
const q_aaaa = await resolver.resolve('AAAA', mx);
if (q_aaaa.length) {
has_aaaa = 1;
ret.mxmap[domain].aaaacnt += 1;
}
ret.mxmap[domain].aaaamap[mx] = q_aaaa;
this.onresolve('aaaa', {
domain: domain,
mx: mx,
aaaa: q_aaaa
}, ret);
}
ret.counts.has_a += has_a;
ret.counts.has_aaaa += has_aaaa;
i += 1;
this.onresolve('end', {
domain: domain,
progress: {
cur: i,
cnt: list.length
}
}, ret);
}
return ret;
}
};
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