sclient.js/index.js

'use strict';

var net = require('net');
var tls = require('tls');

function listenForConns(emitter, opts) {
  function pipeConn(c, out) {
    var sclient = tls.connect({
      servername: opts.remoteAddr, host: opts.remoteAddr, port: opts.remotePort
    , rejectUnauthorized: opts.rejectUnauthorized
    }, function () {
      console.info('[connect] ' + sclient.localAddress.replace('::1', 'localhost') + ":" + sclient.localPort
        + " => " + opts.remoteAddr + ":" + opts.remotePort);
      c.pipe(sclient);
      sclient.pipe(out || c);
    });
    sclient.on('error', function (err) {
      console.error('[error] (remote) ' + err.toString());
    });
    c.on('error', function (err) {
      console.error('[error] (local) ' + err.toString());
    });
    if (out) {
      out.on('error', function (err) {
        console.error('[error] (local) ' + err.toString());
      });
    }
  }

  if ('-' === opts.localAddress || '|' === opts.localAddress) {
    pipeConn(opts.stdin, opts.stdout);
    return;
  }

  var server = net.createServer(pipeConn);
  server.on('error', function (err) {
    console.error('[error] ' + err.toString());
  });
  server.listen({
    host: opts.localAddress
  , port: opts.localPort
  }, function () {
    opts.localPort = this.address().port;
    opts.server = this;
    emitter.emit('listening', opts);
  });
}

function testConn(opts) {
  var emitter = new (require('events').EventEmitter)();

  // Test connection first
  var tlsOpts = {
    host: opts.remoteAddr, port: opts.remotePort
  , rejectUnauthorized: opts.rejectUnauthorized
  };
  if (opts.servername) {
    tlsOpts.servername = opts.servername;
  } else if (/^[\w\.\-]+\.[a-z]{2,}$/i.test(opts.remoteAddr)) {
    tlsOpts.servername = opts.remoteAddr.toLowerCase();
  }
  if (opts.alpn) {
    tlsOpts.ALPNProtocols = [ 'http', 'h2' ];
  }
  var tlsSock = tls.connect(tlsOpts, function () {
    setTimeout(function () {
      tlsSock.end();
      listenForConns(emitter, opts);
    }, 200);
  });
  tlsSock.on('error', function (err) {
    console.warn("[warn] '" + opts.remoteAddr + ":" + opts.remotePort + "' may not be accepting connections: ", err.toString(), '\n');
    listenForConns(emitter, opts);
  });

  return emitter;
}

module.exports = testConn;