The tls.connect() method is an inbuilt application programming interface of class TLS within tls module which is used to create a tls.TLSSocket object.
Syntax:
const tls.connect(port[, host][, options][, callback])
Parameters: This method accept four parameters as mentioned above and described below:
- port: It is the port number.
- host: It is the name of the host.
- options: These options can be enableTrace, host, port, path, socket, allowHalfOpen, etc.
- callback: It is the callback function for further operation.
Return Value: This method returns the object of tls.TLSSocket.
How to generate Private key and Public certificate?
-
Private key: Open notepad and copy paste the following key:
-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQC38R9wXcUbhOd44FavgmE5R3K4JeYOHLnI7dUq1B8/Gv7l3SOg JKef/m9gM1KvUx951mapXGtcWgwB08J3vUE2YOZ4tWJArrVZES0BI/RmFAyhQFP5 HcWl3LSM9LRihP98F33oIkKaCxA5LxOrkgpV4HrUzIKTABDYah7RPex1WQIDAQAB AoGBAIXR71xxa9gUfc5L7+TqBs+EMmrUb6Vusp8CoGXzQvRHMJCMrMFySV0131Nu o0YYRDsAh1nJefYLMNcXd1BjqI+qY8IeRsxaY+9CB2KKGVVDO2uLdurdC2ZdlWXT Vwr3dDoyR0trnXJMmH2ijTeO6bush8HuXxvxJBjvEllM5QYxAkEA3jwny9JP+RFu 0rkqPBe/wi5pXpPl7PUtdNAGrh6S5958wUoR4f9bvwmTBv1nQzExKWu4EIp+7vjJ fBeRZhnBvQJBANPjjge8418PS9zAFyKlITq6cxmM4gOWeveQZwXVNvav0NH+OKdQ sZnnDiG26JWmnD/B8Audu97LcxjxcWI8Jc0CQEYA5PhLU229lA9EzI0JXhoozIBC TlcKFDuLm88VSmlHqDyqvF9YNOpEdc/p2rFLuZS2ndB4D+vu6mjwc5iZ3HECQCxy GBHRclQ3Ti9w76lpv+2kvI4IekRMZWDWnnWfwta+DGxwCgw2pfpleBZkWqdBepb5 JFQbcxQJ0wvRYXo8qaUCQQCgTvWswBj6OTP7LTvBlU1teAN2Lnrk/N5AYHZIXW6m nUG9lYvH7DztWDTioXMrruPF7bdXfZOVJD8t0I4OUzvC -----END RSA PRIVATE KEY-----
Now save the filename as private-key.pem
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Public certificate: Open notepad and copy paste the following key:
-----BEGIN CERTIFICATE----- MIICfzCCAegCCQDxxeXw914Y2DANBgkqhkiG9w0BAQsFADCBgzELMAkGA1UEBhMC SU4xEzARBgNVBAgMCldlc3RiZW5nYWwxEDAOBgNVBAcMB0tvbGthdGExFDASBgNV BAoMC1BhbmNvLCBJbmMuMRUwEwYDVQQDDAxSb2hpdCBQcmFzYWQxIDAeBgkqhkiG 9w0BCQEWEXJvZm9mb2ZAZ21haWwuY29tMB4XDTIwMDkwOTA1NTExN1oXDTIwMTAw OTA1NTExN1owgYMxCzAJBgNVBAYTAklOMRMwEQYDVQQIDApXZXN0YmVuZ2FsMRAw DgYDVQQHDAdLb2xrYXRhMRQwEgYDVQQKDAtQYW5jbywgSW5jLjEVMBMGA1UEAwwM Um9oaXQgUHJhc2FkMSAwHgYJKoZIhvcNAQkBFhFyb2ZvZm9mQGdtYWlsLmNvbTCB nzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAt/EfcF3FG4TneOBWr4JhOUdyuCXm Dhy5yO3VKtQfPxr+5d0joCSnn/5vYDNSr1MfedZmqVxrXFoMAdPCd71BNmDmeLVi QK61WREtASP0ZhQMoUBT+R3Fpdy0jPS0YoT/fBd96CJCmgsQOS8Tq5IKVeB61MyC kwAQ2Goe0T3sdVkCAwEAATANBgkqhkiG9w0BAQsFAAOBgQATe6ixdAjoV7BSHgRX bXM2+IZLq8kq3s7ck0EZrRVhsivutcaZwDXRCCinB+OlPedbzXwNZGvVX0nwPYHG BfiXwdiuZeVJ88ni6Fm6RhoPtu2QF1UExfBvSXuMBgR+evp+e3QadNpGx6Ppl1aC hWF6W2H9+MAlU7yvtmCQQuZmfQ== -----END CERTIFICATE-----
Now save the filename as public-cert.pem
Example 1: Filename: index.js
// Node.js program to demonstrate the // tls.connect() method var tls = require('tls'),
fs = require('fs'),
// Port and host address for server PORT = 1337, HOST = '127.0.0.1',
value = null;
// Private key and public certificate for access var options = {
key: fs.readFileSync('private-key.pem'),
cert: fs.readFileSync('public-cert.pem'),
rejectUnauthorized: false
}; // Creating and initializing server var server = tls.createServer(options, function(socket) {
// Print the data that we received
socket.on('data', function(data) {
console.log('\nReceived: %s ',
data.toString().replace(/(\n)/gm, ""));
});
// Stopping the server
// by using the close() method
server.close(() => {
console.log("Server closed successfully");
});
}); // Start listening on a specific port and address // by using listen() method server.listen(PORT, HOST, function() {
console.log("I'm listening at %s, on port %s", HOST, PORT);
}); // Creating and initializing client // by using tls.connect() method var client = tls.connect(PORT, HOST, options, function() {
// Setting maximum send fragment limit
// by using tlsSocket.setMaxSendFragment() method
value = client.setMaxSendFragment(16384);
if(value)
client.write("tls fragment is set");
else
client.write("tls fragment is not set")
client.end(() => {
console.log("Client closed successfully");
});
}); |
Run the index.js file using the following command:
node index.js
Output:
I'm listening at 127.0.0.1, on port 1337 Client closed successfully Received: tls fragment is set Server closed successfully
Example 2: Filename: index.js
// Node.js program to demonstrate the // tls.connect() method var tls = require('tls'),
fs = require('fs'),
// Port and host address for server PORT = 1337, HOST = '127.0.0.1';
// Private key and public certificate for access var options = {
key: fs.readFileSync('private-key.pem'),
cert: fs.readFileSync('public-cert.pem'),
rejectUnauthorized: false
}; // Creating and initializing server var server = tls.createServer(options, function(socket) {
// Setting maximum send fragment limit
// by using tlsSocket.setMaxSendFragment() method
value = socket.setMaxSendFragment(16384);
if(value)
socket.write("tls fragment is set");
else
socket.write("tls fragment is not set")
// Stopping the server
// by using the close() method
server.close(() => {
console.log("Server closed successfully")
});
}); // Start listening on a specific port and address // by using listen() method server.listen(PORT, HOST, function() {
console.log("I'm listening at %s, on port %s", HOST, PORT);
}); // Creating and initializing client // by using tls.connect() method var client = tls.connect(PORT, HOST, options, function() {
console.log("client is connected");
}); client.on("data", function(data) {
console.log('Received: %s',
data.toString().replace(/(\n)/gm, ""));
// Close the connection after receiving the message
client.end(() => {
console.log("client closed successfully")
});
}); |
Run the index.js file using the following command:
node index.js
Output:
I'm listening at 127.0.0.1, on port 1337 client is connected Received: tls fragment is set client closed successfully Server closed successfully
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/tls.html#tls_tls_connect_port_host_options_callback