CODEWITHSUNDEEP
node.jshttpdnsrequestip
CookieMonster
CookieMonster

Reputation: 1237

Node override request IP resolution

I'm struggling to find the correct terminology to accurately phrase this problem, but I'm gonna give it my best shot:

In node.js, is there a way to manually override the IP address when making an HTTP request (e.g. request some-domain.com/whatever and instead of resolving the IP address through DNS, manually provide some IP address 1.2.3.4) ?

This would, effectively speaking, be the equivalent of setting 1.2.3.4 some-domain.com in /etc/hosts

Upvotes: 16

Views: 6740

Answers (4)

21paradox
21paradox

Reputation: 9

const staticDnsHttpAgent = (resolvconf) => new http.Agent({
  lookup: (hostname, opts, cb) => {
    cb(null, resolvconf, undefined)
  }
});

resolvconf.push({
  address: '<ipv6-address1>', 
  family: 6,
},
{
  address: '<ipv6-address2>', 
  family: 6,
},
{
  address: '<ipv4-address>', 
  family: 4,
},
)
http.get("http://some-domain.com/whatever", {agent: staticDnsAgent(resolveConf)})

this is a update for newer version of nodejs(22), cb params needs to be an array

Upvotes: 0

Chad
Chad

Reputation: 2131

Node's http and https modules take an Agent as an argument, and you can override the dns resolver with the lookup parameter.

const http = require("http");
const https = require("https");


const staticLookup = (ip, v) => (hostname, opts, cb) => cb(null, ip, v || 4)
const staticDnsAgent = (scheme, ip) => new require(scheme).Agent({lookup: staticLookup(ip)})

http.get("http://some-domain.com/whatever", {agent: staticDnsAgent('http', '1.2.3.4')})

Upvotes: 17

Aur&#233;lien Nicolas
Aur&#233;lien Nicolas

Reputation: 381

There is a tiny module that does exactly that: evil-dns.

evilDns.add('foo.com', '1.2.3.4');

Upvotes: 12

Cyph
Cyph

Reputation: 631

I'd suggest looking at Nodejs's doc on the DNS API (https://nodejs.org/api/dns.html). You can modify the OS host file and use dns.lookup() to pull from the host file and not do a DNS query.

Not sure if you are trying to avoid modifying the host file?

Upvotes: 3

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