yrxzy/node_modules/_pac-resolver@3.0.0@pac-resolver/dnsResolve.js

/**
 * Module dependencies.
 */

var dns = require('dns');

/**
 * Module exports.
 */

module.exports = dnsResolve;

dnsResolve.async = true;

/**
 * Resolves the given DNS hostname into an IP address, and returns it in the dot
 * separated format as a string.
 *
 * Example:
 *
 * ``` js
 * dnsResolve("home.netscape.com")
 *   // returns the string "198.95.249.79".
 * ```
 *
 * @param {String} host hostname to resolve
 * @return {String} resolved IP address
 */

function dnsResolve (host, fn) {
  var family = 4;
  dns.lookup(host, family, function (err, ip) {
    if (err) return fn(err);
    fn(null, ip || '127.0.0.1');
  });
}