Notes

'use strict'

const express = require('express')
const bodyParser = require('body-parser');
const cors = require('cors');
const exec = require('child_process').exec;
const { spawn } = require('child_process')

const app = express();
const port = 3006;

// Where we will keep books
let books = [];

app.use(cors());

// Configuring body parser middleware
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.get('/packets/:MC/:port/:timeout', (req, res) => {

const MC_IP = req.params.MC;
const MC_Port = req.params.port;
const Timeout = req.params.timeout;


var x = "";


// const ls = spawn('tcpdump', ['-XX', '-i ens38' , 'udp port 5004 and dst 225.0.0.11','-v'] , {timeout : 100 * 60})

// ls.stdout.pipe(process.stdout)


exec(`sudo timeout ${Timeout} tcpdump -i ens38 -c 3 udp port ${MC_Port} and dst ${MC_IP} -v`, function (error, stdout, stderr) {

console.log("stderr: " + stderr);
console.log("stdout: " + stdout);

var mySubstring = stderr.substring(
stderr.lastIndexOf("bytes") + 6,

stderr.lastIndexOf("packets")
);
// "0 packets capturedn2 packets received by filtern0"

// exctract number :: "18 packets received by filtern0 "
var packet_Number = mySubstring.replace(/D.*/g, "")
console.log("packet_Number: "+ packet_Number);
if( packet_Number < 1 )
{
res.json({"No Recieved" : mySubstring});

}else{
res.json({"Recieved" : mySubstring,
"packets" : stdout
});

}
x = stderr;
});




// moin@moin-server:~$ sudo timeout 0.09 tcpdump -i ens38 udp port 5004 and dst 225.0.0.11



});


app.get('/packets/Check', (req, res) => {

const MC_IP = req.params.MC;
const MC_Port = req.params.port;
const Timeout = req.params.timeout;


var x = "";


// const ls = spawn('tcpdump', ['-XX', '-i ens38' , 'udp port 5004 and dst 225.0.0.11','-v'] , {timeout : 100 * 60})

// ls.stdout.pipe(process.stdout)


exec(`sudo timeout 2 tcpdump -i ens38`, function (error, stdout, stderr) {

console.log("stderr: " + stderr);
console.log("stdout: " + stdout);

var mySubstring = stderr.substring(
stderr.lastIndexOf("bytes") + 6,

stderr.lastIndexOf("packets")
);

res.json({"Recieved" : mySubstring,
"packets" : stdout
});

x = stderr;
});




// moin@moin-server:~$ sudo timeout 0.09 tcpdump -i ens38 udp port 5004 and dst 225.0.0.11



});


/// GET ProCESS ID FFMPEG




app.listen(port, () => console.log(`Hello world app listening on port ${port}!`));