Node DNS Resolver

An implementation build on top of the node-dns module to validate dns records.

Installation

1. Add the repository as a submodule to your git repository.
2. In the root of your npm project, run npm install <path-to-submodule>

Setup

To use the DNS validation you can import the class and configure the valid values records.

import Resolver from "dns-resolver"

const configuration = {
  validIpv4: ["127.0.0.1"],
  validIpv6: ["::1"],
  validCname: [],
  validSpf: "",
  validMx: []
}

const resolver = new Resolver(configuration)

resolver.validateWeb("example.com")
.then(result => {
  console.log("example.com resolved to a valid ip address")
})
.catch(err => {
  console.warn("example.com could not be resolved")
  console.warn(err)
})

For CNAME or Web validation the resolver will follow the CNAME records until it reaches a valid record. If the maximum depth is reached, the validation will fail. When the validation fails the error will contain the chain of records that were queried.

Global configuration

It's also possible to configure the resolver globally. To use the global configuration in a resolver instance omit the config argument in the constructor. The global configuration of the instance is not automatically updated when the configuration is changed. It's possible to update the configuration by calling the config method on the instance.

import Resolver from "dns-resolver"

Resolver.config({
  validIpv4: ["127.0.0.1"],
  validIpv6: ["::1"],
  validCname: [],
  validSpf: "",
  validMx: []
})