153 lines
4.2 KiB
JavaScript
153 lines
4.2 KiB
JavaScript
const { EventEmitter } = require('events');
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const debug = require('debug')('localtunnel:client');
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const fs = require('fs');
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const net = require('net');
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const tls = require('tls');
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const HeaderHostTransformer = require('./HeaderHostTransformer');
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// manages groups of tunnels
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module.exports = class TunnelCluster extends EventEmitter {
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constructor(opts = {}) {
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super(opts);
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this.opts = opts;
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}
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open() {
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const opt = this.opts;
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// Prefer IP if returned by the server
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const remoteHostOrIp = opt.remote_ip || opt.remote_host;
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const remotePort = opt.remote_port;
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const localHost = opt.local_host || 'localhost';
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const localPort = opt.local_port;
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const localProtocol = opt.local_https ? 'https' : 'http';
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const allowInvalidCert = opt.allow_invalid_cert;
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debug(
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'establishing tunnel %s://%s:%s <> %s:%s',
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localProtocol,
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localHost,
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localPort,
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remoteHostOrIp,
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remotePort
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);
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// connection to localtunnel server
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const remote = net.connect({
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host: remoteHostOrIp,
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port: remotePort,
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});
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remote.setKeepAlive(true);
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remote.on('error', err => {
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debug('got remote connection error', err.message);
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// emit connection refused errors immediately, because they
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// indicate that the tunnel can't be established.
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if (err.code === 'ECONNREFUSED') {
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this.emit(
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'error',
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new Error(
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`connection refused: ${remoteHostOrIp}:${remotePort} (check your firewall settings)`
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)
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);
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}
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remote.end();
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});
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const connLocal = () => {
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if (remote.destroyed) {
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debug('remote destroyed');
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this.emit('dead');
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return;
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}
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debug('connecting locally to %s://%s:%d', localProtocol, localHost, localPort);
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remote.pause();
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if (allowInvalidCert) {
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debug('allowing invalid certificates');
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}
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const getLocalCertOpts = () =>
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allowInvalidCert
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? { rejectUnauthorized: false }
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: {
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cert: fs.readFileSync(opt.local_cert),
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key: fs.readFileSync(opt.local_key),
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ca: opt.local_ca ? [fs.readFileSync(opt.local_ca)] : undefined,
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};
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// connection to local http server
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const local = opt.local_https
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? tls.connect({ host: localHost, port: localPort, ...getLocalCertOpts() })
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: net.connect({ host: localHost, port: localPort });
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const remoteClose = () => {
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debug('remote close');
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this.emit('dead');
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local.end();
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};
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remote.once('close', remoteClose);
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// TODO some languages have single threaded servers which makes opening up
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// multiple local connections impossible. We need a smarter way to scale
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// and adjust for such instances to avoid beating on the door of the server
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local.once('error', err => {
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debug('local error %s', err.message);
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local.end();
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remote.removeListener('close', remoteClose);
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if (err.code !== 'ECONNREFUSED') {
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return remote.end();
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}
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// retrying connection to local server
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setTimeout(connLocal, 1000);
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});
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local.once('connect', () => {
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debug('connected locally');
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remote.resume();
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let stream = remote;
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// if user requested specific local host
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// then we use host header transform to replace the host header
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if (opt.local_host) {
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debug('transform Host header to %s', opt.local_host);
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stream = remote.pipe(new HeaderHostTransformer({ host: opt.local_host }));
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}
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stream.pipe(local).pipe(remote);
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// when local closes, also get a new remote
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local.once('close', hadError => {
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debug('local connection closed [%s]', hadError);
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});
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});
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};
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remote.on('data', data => {
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const match = data.toString().match(/^(\w+) (\S+)/);
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if (match) {
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this.emit('request', {
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method: match[1],
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path: match[2],
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});
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}
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});
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// tunnel is considered open when remote connects
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remote.once('connect', () => {
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this.emit('open', remote);
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connLocal();
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});
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}
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};
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