// Captive Portal - extending:
// https://gist.github.com/MaBecker/ae9dade26b44524e076ca19f5fd72fab
// Added form and post back to join network
var http = require('http');
var wifi = require('Wifi');
var dgram = require('dgram');
var dns_srv = dgram.createSocket('udp4');
var SSID = 'CaptivePortalTest';
var authMode = 'open';
var password = null;
var portHTTP = 80;
var portDNS = 53;
var dnsIPStr = '192.168.4.1';
var dnsIP = dnsIPStr.split('.').map(n => String.fromCharCode(parseInt(n, 10))).join('');
var page = 'building...';
// get Query name out of message
// offset = 12
// end \x00
function dnsQname(msg) {
var i = 12;
var qname = '';
while ( msg[i] !== '\x00' ) {
qname += msg[i];
i++;
}
console.log({qname:qname});
return qname + '\x00';
}
/*
1. line header
2. line query
3. line resource
*/
function dnsResponse(msg,dns_ip){
return msg[0]+msg[1] + '\x81\x80'+'\x00\x01'+'\x00\x01'+'\x00\x00\x00\x00' +
dnsQname(msg) + '\x00\x01' + '\x00\x01' +
'\xc0\x0c'+'\x00\x01'+'\x00\x01'+'\x00\x00\x00\xf9'+'\x00\x04' + dns_ip ;
}
function startDNSServer(port){
dns_srv .on('error', (err) => {
dns_srv.close();
});
dns_srv.on('message', (msg, info) => {
// we only serve ip4
if ( msg[msg.length-3] === '\x01') {
dns_srv .send(dnsResponse(msg,dnsIP),info.port,info.address);
}
});
dns_srv.bind(port);
}
// start http server
function startHttpServer(port){
var server = http.createServer(function (req, res) {
accept = req.headers.Accept || '';
var a = url.parse(req.url, true);
console.log( { accept:accept,a :a } );
if (a.pathname=="/connect") {
res.writeHead(200, {'Content-Type': 'text/plain'});
console.log(a.query);
wifi.connect(a.query.ssid,{password:a.query.pwd},function(){
console.log("Connected to access point, ",wifi.getIP());
//wifi.save();
// If connect fails - this will not happen... need to handle errors
res.end(`connected to ${wifi.getIP().ip}`);
});
res.write("Connecting....\n");
} else
if (accept !== '*\/*' || a.page === '/hotspot-detect.html' ) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(page);
} else { // redirect to the Setup page
res.writeHead(302, {'Location': 'http://192.168.4.1',
'Content-Type': 'text/plain'});
res.end();
}
});
server.listen(port);
}
// start being a access point
function startAccessPoint(ssid,authMode, password){
wifi.startAP(ssid,{"authMode" : authMode,"password" : password});
}
// stop beeing connected to a access point
function disconnectStation(){
wifi.disconnect();
}
var scan=[];
function start(){
disconnectStation();
startAccessPoint('CaptivePortalTest','open',null);
startHttpServer(80);
startDNSServer(53);
}
wifi.scan(function(s){scan=s;
scan.map( ap => console.log( ap.ssid ) );
style=`
`;
page=`
WiFi