node/test/parallel/test-tls-sni-option.js

if (!process.features.tls_sni) {
  console.error('Skipping because node compiled without OpenSSL or ' +
                'with old OpenSSL version.');
  process.exit(0);
}

var common = require('../common'),
    assert = require('assert'),
    fs = require('fs');

if (!common.hasCrypto) {
  console.log('1..0 # Skipped: missing crypto');
  process.exit();
}
var tls = require('tls');

function filenamePEM(n) {
  return require('path').join(common.fixturesDir, 'keys', n + '.pem');
}

function loadPEM(n) {
  return fs.readFileSync(filenamePEM(n));
}

var serverOptions = {
  key: loadPEM('agent2-key'),
  cert: loadPEM('agent2-cert'),
  SNICallback: function(servername, callback) {
    var context = SNIContexts[servername];

    // Just to test asynchronous callback
    setTimeout(function() {
      if (context) {
        if (context.emptyRegression)
          callback(null, {});
        else
          callback(null, tls.createSecureContext(context));
      } else {
        callback(null, null);
      }
    }, 100);
  }
};

var SNIContexts = {
  'a.example.com': {
    key: loadPEM('agent1-key'),
    cert: loadPEM('agent1-cert')
  },
  'b.example.com': {
    key: loadPEM('agent3-key'),
    cert: loadPEM('agent3-cert')
  },
  'c.another.com': {
    emptyRegression: true
  }
};

var serverPort = common.PORT;

var clientsOptions = [{
  port: serverPort,
  key: loadPEM('agent1-key'),
  cert: loadPEM('agent1-cert'),
  ca: [loadPEM('ca1-cert')],
  servername: 'a.example.com',
  rejectUnauthorized: false
}, {
  port: serverPort,
  key: loadPEM('agent2-key'),
  cert: loadPEM('agent2-cert'),
  ca: [loadPEM('ca2-cert')],
  servername: 'b.example.com',
  rejectUnauthorized: false
}, {
  port: serverPort,
  key: loadPEM('agent3-key'),
  cert: loadPEM('agent3-cert'),
  ca: [loadPEM('ca1-cert')],
  servername: 'c.wrong.com',
  rejectUnauthorized: false
}, {
  port: serverPort,
  key: loadPEM('agent3-key'),
  cert: loadPEM('agent3-cert'),
  ca: [loadPEM('ca1-cert')],
  servername: 'c.another.com',
  rejectUnauthorized: false
}];

var serverResults = [],
    clientResults = [],
    serverErrors = [],
    clientErrors = [],
    serverError,
    clientError;

var server = tls.createServer(serverOptions, function(c) {
  serverResults.push(c.servername);
});

server.on('clientError', function(err) {
  serverResults.push(null);
  serverError = err.message;
});

server.listen(serverPort, startTest);

function startTest() {
  function connectClient(i, callback) {
    var options = clientsOptions[i];
    clientError = null;
    serverError = null;

    var client = tls.connect(options, function() {
      clientResults.push(
          /Hostname\/IP doesn't/.test(client.authorizationError || ''));
      client.destroy();

      next();
    });

    client.on('error', function(err) {
      clientResults.push(false);
      clientError = err.message;
      next();
    });

    function next() {
      clientErrors.push(clientError);
      serverErrors.push(serverError);

      if (i === clientsOptions.length - 1)
        callback();
      else
        connectClient(i + 1, callback);
    }
  };

  connectClient(0, function() {
    server.close();
  });
}

process.on('exit', function() {
  assert.deepEqual(serverResults, ['a.example.com', 'b.example.com',
                                   'c.wrong.com', null]);
  assert.deepEqual(clientResults, [true, true, false, false]);
  assert.deepEqual(clientErrors, [null, null, null, "socket hang up"]);
  assert.deepEqual(serverErrors, [null, null, null, "Invalid SNI context"]);
});