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udp-proxy.js
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udp-proxy.js
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const dgram = require('dgram');
const server = dgram.createSocket('udp4');
const GLOBAL_PORT = process.argv[2];
const TARGET_IP = process.argv[3];
const TARGET_PORT = process.argv[4];
console.log(process.argv);
function forward_udp(ip, port, msg, rinfo, callback) {
console.log('Forwarding UDP called...');
let forwarder = dgram.createSocket('udp4');
forwarder.on('error', function (e) {
console.log('Forwarder got error: ', e);
forwarder.close();
});
forwarder.on('message', function (msg, rinfo) {
console.log('Forward got response: ', msg);
callback(msg, rinfo);
forwarder.close();
});
forwarder.bind(port);
forwarder.send(msg, 0, msg.length, port, ip, function (err, bytes) {
console.log(`Sending forwarding UDP packet to target ${ip}:${rinfo.port} of ${msg}`);
if(err) {
console.log('Forwarder got error while forwarding A2S: ', err);
}
})
}
server.on('error', (err) => {
console.log(`server error:\n${err.stack}`);
server.close();
});
server.on('message', (msg, rinfo) => {
console.log(`Got proxy request with message: ${msg}`);
if(msg.indexOf('Source') !== -1) {
forward_udp(TARGET_IP, TARGET_PORT, msg, rinfo, function (msg2, rinfo2) {
console.log(`Got target UDP packet with message, sending back to origin: ${msg}`);
server.send(msg2, 0, msg2.length, rinfo.port, rinfo.address, function (err, bytes) {
if (err) {
console.log('Server got error on back-sender', err);
}
})
});
}
console.log(`Packet was delivered to origin!`);
});
server.on('listening', () => {
const address = server.address();
console.log(`Server listening ${address.address}:${address.port}`);
});
server.bind(GLOBAL_PORT);