95 lines
3.1 KiB
JavaScript
95 lines
3.1 KiB
JavaScript
/**
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* Scanning WiFis on Windows
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* Created by kc on 04.04.16.
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*/
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const systemRoot = process.env.SystemRoot || 'C:\\Windows';
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const tool = systemRoot + '\\System32\\netsh.exe';
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const cmdLine = tool + ' wlan show networks mode=Bssid';
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const detector = tool + ' show alias';
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/**
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* Parsing netnsh output. Unfortunately netsh supplies the network information
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* in the language of the operating system. Translating the terms into every
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* language supplied is not possible, therefore this implementation follows
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* an approach of analyzing the structure of the output
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*/
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function parseOutput(str, callback) {
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let blocks = str.split('\n\n');
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let wifis = [];
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let err = null;
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try {
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if (blocks.length < 2) {
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// 2nd try, with \r\n
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blocks = str.split('\r\n\r\n')
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}
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if (!blocks || blocks.length === 1) {
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// No WiFis found
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return callback(null, []);
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}
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// Each block has the same structure, while some parts might be available and others
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// not. A sample structure:
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// SSID 1 : AP-Test1
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// Network type : Infrastructure
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// Authentication : WPA2-Personal
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// Encryption : CCMP
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// BSSID 1 : 00:aa:f2:77:a5:53
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// Signal : 46%
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// Radio type : 802.11n
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// Channel : 6
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// Basic rates (MBit/s) : 1 2 5.5 11
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// Other rates (MBit/s) : 6 9 12 18 24 36 48 54
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for (let i = 1, l = blocks.length; i < l; i++) {
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let network = {};
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let lines = blocks[i].split('\n');
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let regexChannel = /[a-zA-Z0-9()\s]+:[\s]*[0-9]+$/g;
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if (!lines || lines.length < 2) {
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continue;
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}
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// First line is always the SSID (which can be empty)
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let ssid = lines[0].substring(lines[0].indexOf(':') + 1).trim();
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for (let t = 1, n = lines.length; t < n; t++) {
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if (lines[t].split(':').length === 7) {
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// This is the mac address, use this one as trigger for a new network
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if (network.mac) {
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wifis.push(network);
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}
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network = {
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ssid: ssid,
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mac : lines[t].substring(lines[t].indexOf(':') + 1).trim()
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};
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} else if (lines[t].indexOf('%') > 0) {
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// Network signal strength, identified by '%'
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let level = parseInt(lines[t].split(':')[1].split('%')[0].trim(), 10);
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network.rssi = (level / 2) - 100;
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} else if (!network.channel) {
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// A tricky one: the channel is the first one having just ONE number. Set only
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// if the channel is not already set ("Basic Rates" can be a single number also)
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if (regexChannel.exec(lines[t].trim())) {
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network.channel = parseInt(lines[t].split(':')[1].trim(), 10);
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}
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}
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}
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if (network) {
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wifis.push(network);
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}
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}
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}
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catch (ex) {
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err = ex;
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}
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callback(err, wifis);
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}
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module.exports = {
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parseOutput: parseOutput,
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cmdLine : cmdLine,
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detector : detector,
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tool : tool
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};
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