dnsResolve.js
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/**
* 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');
});
}