Dart Requires Chilkat v11.0.0+

SSL Server Example

See more Socket/SSL/TLS Examples

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final listenSslSocket = CkSocket();

  // An SSL server needs a digital certificate.  This example loads it from a PFX file.

  // Create an instance of a certificate store object, load a PFX file,
  // locate the certificate we need, and use it.
  // (a PFX file may contain more than one certificate.)
  final certStore = CkCertStore();
  // The 1st argument is the filename, the 2nd arg is the 
  // PFX file's password:
  try {
    certStore.loadPfxFile('chilkat.pfx', 'test');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Find the certificate to be used for SSL:
  final jsonCN = CkJsonObject();
  jsonCN.updateString('CN', 'example.com');

  final cert = CkCert();
  try {
    certStore.findCert(jsonCN, cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Use the certificate:
  try {
    listenSslSocket.initSslServer(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Bind and listen on a port:
  final myPort = 8123;
  // Allow for a max of 5 queued connect requests.
  final backLog = 5;
  try {
    listenSslSocket.bindAndListen(myPort, backLog);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // If accepting an SSL/TLS connection, the SSL handshake is part of the connection
  // establishment process. This involves a few back-and-forth messages between the 
  // client and server to establish algorithms and a shared key to create the secure 
  // channel. The sending and receiving of these messages are governed by the 
  // MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
  // (and this is the default unless changed by your application), then the 
  // AcceptNext can hang indefinitely during the SSL handshake process. 
  // Make sure these properties are set to appropriate values before calling AcceptNext.

  // Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
  listenSslSocket.maxReadIdleMs = 10000;
  listenSslSocket.maxSendIdleMs = 10000;

  // Accept a single client connection and establish the secure SSL/TLS channel:
  final maxWaitMillisec = 20000;
  final clientSock = CkSocket();
  try {
    listenSslSocket.acceptNext(maxWaitMillisec, clientSock);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The client (in this example) is going to send a "Hello Server! -EOM-" 
  // message.  Read it:
  final String receivedMsg;
  try {
    receivedMsg = clientSock.receiveUntilMatch('-EOM-');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(receivedMsg);

  // Send a "Hello Client! -EOM-" message:
  try {
    clientSock.sendString('Hello Client! -EOM-');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Close the connection with the client
  // Wait a max of 20 seconds (20000 millsec)
  clientSock.close(20000);
}