Block Device Support for D-Link Router from Active Clients

dlink-block-device-from-active-clients.js

// ==UserScript==
// @name         Block Device: Active Client
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        http://192.168.100.1/dhcptbl.htm
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    window.ipPrefix = '192.168.100.';

    String.prototype.replaceAll = function(search, replacement) {
        var target = this;
        return target.split(search).join(replacement);
    };

    window.setCookie = function (cname, cvalue, exdays) {
        var d = new Date();
        d.setTime(d.getTime() + (exdays*24*60*60*1000));
        var expires = "expires="+ d.toUTCString();
        document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
    }

    window.getCookie = function (cname) {
        var name = cname + "=";
        var decodedCookie = decodeURIComponent(document.cookie);
        var ca = decodedCookie.split(';');
        for(var i = 0; i <ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') {
                c = c.substring(1);
            }
            if (c.indexOf(name) == 0) {
                return c.substring(name.length, c.length);
            }
        }
        return "";
    }


    var table = document.getElementsByClassName('formlisting')[1];
    if (table == undefined) {
        table = document.getElementsByClassName('formlisting')[0];
    }

    var trs = table.getElementsByTagName('tr');
    trs[0].innerHTML = trs[0].innerHTML + '<td class="form_label_col">Action</td>';
    for (let i = 1; i < trs.length; i++) {
        var tr = trs[i];
        var mac = tr.getElementsByTagName('td')[2].getElementsByTagName('b')[0].getElementsByTagName('span')[0];
        if (mac == undefined) {
            mac = tr.getElementsByTagName('td')[2].getElementsByTagName('b')[0];
        }
        mac = mac.innerText;

        tr.innerHTML = tr.innerHTML + '<td><button onclick="window.blockDevice(\'' + mac + '\');return false;">Block</button></td>';
    }

    window.blockDevice = function (mac) {
        window.setCookie('deviceToBlock', mac, 30);
        location.pathname = 'lan.htm';
    }

})();