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node_dns_changer

A multiplatform (Linux, Windows, macOS) DNS library for changing DNS servers written in NodeJS.

Notes

• IMPORTANT: Requires root/sudo/admin privileges to adjust any settings.
• DNSbackupName doesn't need to be provided
• Tested on:
  • Linux:
    • openSUSE Leap 15
    • Ubuntu 18.04
    • Fedora 28
  • Windows
    • 7 (SP1)
    • 8.1
    • 10 (1803, 1809)
  • macOS (El Capitan, Sierra, Mojave)
• May have problems working with Hyper-V switches on Windows

Installing

$ npm i node_dns_changer

Usage

Standard usage:

const dns_changer = require('node_dns_changer');
 
// set DNS servers with backup name of 'dnsBackup'
dns_changer.setDNSservers({
    DNSservers: ['8.8.8.8','8.8.4.4'],
    mkBackup: true,
    DNSbackupName: 'dnsBackup'
});
 
// restore settings with logging enabled
dns_changer.restoreDNSservers({
    DNSbackupName: 'dnsBackup',
    loggingEnable: true,
    rmBackup: true
});
 
// setup DNS servers without a custom backup name
dns_changer.setDNSservers({
    DNSservers: ['8.8.8.8','8.8.4.4']
});
 
// restore settings without a custom backup name
dns_changer.restoreDNSservers({});

Promises support:

const dns_changer = require('node_dns_changer');
 
// set DNS servers with backup name of 'dnsBackup'
dns_changer.setDNSservers({
    DNSservers: ['8.8.8.8','8.8.4.4'],
    mkBackup: true,
    DNSbackupName: 'dnsBackup'
}).then((response) => {
    if (response) console.log(`${response === true ? "DNS changing complete" : "DNS changing failed"}.`);
});

Arguments

Arg	Description	Found in	Data type	Default value
DNSservers	A variable in which the DNS servers are inputted	setDNSservers; restoreDNSservers	Array of strings, or a string with a space	null
loggingEnable	Log the events as they take place	setDNSservers; restoreDNSservers	boolean	false
mkBackup	Make a backup when applicable	setDNSservers	boolean	true
rmBackup	Remove a backup when applicable	restoreDNSservers	boolean	false
macOSuseDHCP	Restore DNS servers given via DHCP on macOS	restoreDNSservers	boolean	true
windowsPreferNetsh	Use netsh instead of powershell for functions on Windows 8 and above	setDNSservers; restoreDNSservers	boolean	false

How it works

Installation

Platform	Description
Linux	1. /etc/resolv.conf is backed up to /etc/resolv.conf.(backupname) 2. A new /etc/resolv.conf file is written with the given servers 3. /etc/resolv.conf is made immutible 4. DNS cache is flushed.
Windows	1. DNS settings are applied to all ethernet and wireless interfaces 2. DNS cache is flushed.
macOS	1. DNS settings are applied to all network interfaces 2. DNS cache is flushed.

Restoration

Platform	Description
Linux	1. /etc/resolv.conf is made mutible 2. /etc/resolv.conf/.(backupname) is restored to /etc/resolv.conf 3. DNS cache is flushed.
Windows	1. All ethernet and wireless interfaces are told to fetch DNS settings from DHCP 2. DNS cache is flushed.
macOS	1. DNS addresses are either retrieved from the backup made during installation or fetched from DHCP then are set on all network interfaces 2. DNS cache is flushed.

Test it in Docker

Build: docker build -t node_dns_changer .
Run: docker run --rm -it node_dns_changer
Go to folder: cd /root/node_dns_changer && node
Use:

const dns_changer = require('./index.js');
 
dns_changer.setDNSservers({
    DNSservers: ['8.8.8.8','8.8.4.4'],
    mkBackup: true,
    DNSbackupName: 'dnsBackup',
    loggingEnable: true
});
 
dns_changer.restoreDNSservers({
    DNSbackupName:'dnsBackup',
    loggingEnable: true,
    rmBackup: true
});