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A node.js DNS API proof of concept that can resolve various types of records.
https://github.com/ml4den/dnsApi
const express = require ('express');
const app = express();
const dns = require('dns');
const Joi = require ('joi');
const apiVersion = "v1";
app.use(express.json());
app.get('/', (req, res) => {
res.send('Go to /api');
});
app.get('/api/', (req, res) => {
const Response = {
status: 'ok',
"service_version": apiVersion
};
res.send(Response);
});
app.get('/api/A/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolve4(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
//console.log(`addresses: ${JSON.stringify(addresses)}`);
//console.log(dns.getServers());
const dnsResponse = {
ipv4: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/AAAA/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolve6(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
ipv6: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/CNAME/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolveCname(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
alias: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/MX/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolveMx(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
mx: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/NAPTR/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolveNaptr(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
naptr: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/NS/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolveNs(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
ns: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/PTR/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolvePtr(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
ptr: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/SOA/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolveSoa(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
soa: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/SRV/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolveSrv(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
srv: addresses,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/TXT/:hostname', (req, res) => {
const { error } = validateHostname(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.resolveTxt(req.params.hostname, (err, records) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
txt: records,
hostname: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
app.get('/api/reverse/:hostname', (req, res) => {
const { error } = validateIp(req.params.hostname);
if (error) return res.status(400).send( { error: error.name, message: error.details[0].message } );
dns.reverse(req.params.hostname, (err, addresses) => {
if (err) return res.status(404).send( { error: 'NotFound', message: 'Hostname not found' } );
const dnsResponse = {
hostname: addresses,
ip: req.params.hostname,
"service_version": apiVersion
};
res.send(dnsResponse);
});
});
function validateHostname(hostname) {
const schema = Joi.string().required().regex(/^[a-zA-Z0-9\-_\.]{3,253}$/, { name: 'permitted name' });
return schema.validate(hostname);
}
function validateIp(hostname) {
const schema = Joi.string().ip().required();
return schema.validate(hostname);
}
const port = process.env.PORT || 3000;
app.listen(port, () => console.log (`Listening on port ${port}...`));
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