SwitchHosts/app/server/applyAfter_Unix.js

/**
 * @author oldj
 * @blog http://oldj.net
 */

'use strict';

const fs = require('fs')
const path = require('path')
const {work_path} = require('./paths')
const exec = require('child_process').exec
const platform = process.platform

function forMac(sudo_pswd, callback) {
  let cmd_fn = path.join(work_path, '_restart_mDNSResponder.sh');
  let cmd = `
p1=/System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
if [ -f $p1 ]; then
    echo '${sudo_pswd}' | sudo -S launchctl unload -w $p1
    echo '${sudo_pswd}' | sudo -S launchctl load -w $p1
fi

p2=/System/Library/LaunchDaemons/com.apple.discoveryd.plist
if [ -f p2 ]; then
    echo '${sudo_pswd}' | sudo -S launchctl unload -w $p2
    echo '${sudo_pswd}' | sudo -S launchctl load -w $p2
fi

echo '${sudo_pswd}' | sudo -S killall -HUP mDNSResponder
`;

  fs.writeFileSync(cmd_fn, cmd, 'utf-8');

  exec(`/bin/sh ${cmd_fn}`, function (error, stdout, stderr) {
    fs.unlink(cmd_fn)

    // command output is in stdout
    if (error) {
      console.log(error);
    }
    console.log(stdout, stderr);

    callback();
  });
}

module.exports = (sudo_pswd, callback) => {
  if (sudo_pswd && platform === 'darwin') {
    forMac(sudo_pswd, callback);
  } else {
    callback()
  }
}