goldilocks.js/lib/tcp/index.js

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'use strict';
module.exports.create = function (deps, config) {
console.log('config', config);
var listeners = require('../servers').listeners.tcp;
var domainUtils = require('../domain-utils');
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var modules;
var addrProperties = [
'remoteAddress'
, 'remotePort'
, 'remoteFamily'
, 'localAddress'
, 'localPort'
, 'localFamily'
];
function nameMatchesDomains(name, domainList) {
return domainList.some(function (pattern) {
return domainUtils.match(pattern, name);
});
}
function proxy(mod, conn, opts) {
// First thing we need to add to the connection options is where to proxy the connection to
var newConnOpts = domainUtils.separatePort(mod.address || '');
newConnOpts.port = newConnOpts.port || mod.port;
newConnOpts.host = newConnOpts.host || mod.host || 'localhost';
// Then we add all of the connection address information. We need to prefix all of the
// properties with '_' so we can provide the information to any connection `createConnection`
// implementation but not have the default implementation try to bind the same local port.
addrProperties.forEach(function (name) {
newConnOpts['_' + name] = opts[name] || opts['_'+name] || conn[name] || conn['_'+name];
});
modules.proxy(conn, newConnOpts);
return true;
}
function checkTcpProxy(conn, opts) {
var proxied = false;
// TCP Proxying (ie routing based on domain name [vs local port]) only works for
// TLS wrapped connections, so if the opts don't give us a servername or don't tell us
// this is the decrypted side of a TLS connection we can't handle it here.
if (!opts.servername || !opts.encrypted) { return proxied; }
proxied = config.domains.some(function (dom) {
if (!dom.modules || !Array.isArray(dom.modules.tcp)) { return false; }
if (!nameMatchesDomains(opts.servername, dom.names)) { return false; }
return dom.modules.tcp.some(function (mod) {
if (mod.type !== 'proxy') { return false; }
return proxy(mod, conn, opts);
});
});
proxied = proxied || config.tcp.modules.some(function (mod) {
if (mod.type !== 'proxy') { return false; }
if (!nameMatchesDomains(opts.servername, mod.domains)) { return false; }
return proxy(mod, conn, opts);
});
return proxied;
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}
function checkTcpForward(conn, opts) {
// TCP forwarding (ie routing connections based on local port) requires the local port
if (!conn.localPort) { return false; }
return config.tcp.modules.some(function (mod) {
if (mod.type !== 'forward') { return false; }
if (mod.ports.indexOf(conn.localPort) < 0) { return false; }
return proxy(mod, conn, opts);
});
}
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// opts = { servername, encrypted, peek, data, remoteAddress, remotePort }
function peek(conn, firstChunk, opts) {
opts.firstChunk = firstChunk;
conn.__opts = opts;
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// TODO port/service-based routing can do here
// TLS byte 1 is handshake and byte 6 is client hello
if (0x16 === firstChunk[0]/* && 0x01 === firstChunk[5]*/) {
modules.tls.emit('connection', conn);
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return;
}
// This doesn't work with TLS, but now that we know this isn't a TLS connection we can
// unshift the first chunk back onto the connection for future use. The unshift should
// happen after any listeners are attached to it but before any new data comes in.
if (!opts.hyperPeek) {
process.nextTick(function () {
conn.unshift(firstChunk);
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});
}
// Connection is not TLS, check for HTTP next.
if (firstChunk[0] > 32 && firstChunk[0] < 127) {
var firstStr = firstChunk.toString();
if (/HTTP\//i.test(firstStr)) {
modules.http.emit('connection', conn);
return;
}
}
console.warn('failed to identify protocol from first chunk', firstChunk);
conn.destroy();
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}
function tcpHandler(conn, opts) {
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function getProp(name) {
return opts[name] || opts['_'+name] || conn[name] || conn['_'+name];
}
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opts = opts || {};
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var logName = getProp('remoteAddress') + ':' + getProp('remotePort') + ' -> ' +
getProp('localAddress') + ':' + getProp('localPort');
console.log('[tcpHandler]', logName, 'connection started - encrypted: ' + (opts.encrypted || false));
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var start = Date.now();
conn.on('timeout', function () {
console.log('[tcpHandler]', logName, 'connection timed out', (Date.now()-start)/1000);
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});
conn.on('end', function () {
console.log('[tcpHandler]', logName, 'connection ended', (Date.now()-start)/1000);
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});
conn.on('close', function () {
console.log('[tcpHandler]', logName, 'connection closed', (Date.now()-start)/1000);
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});
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if (checkTcpForward(conn, opts)) { return; }
if (checkTcpProxy(conn, opts)) { return; }
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// XXX PEEK COMMENT XXX
// TODO we can have our cake and eat it too
// we can skip the need to wrap the TLS connection twice
// because we've already peeked at the data,
// but this needs to be handled better before we enable that
// (because it creates new edge cases)
if (opts.hyperPeek) {
console.log('hyperpeek');
peek(conn, opts.firstChunk, opts);
return;
}
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function onError(err) {
console.error('[error] socket errored peeking -', err);
conn.destroy();
}
conn.once('error', onError);
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conn.once('data', function (chunk) {
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conn.removeListener('error', onError);
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peek(conn, chunk, opts);
});
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}
modules = {};
modules.tcpHandler = tcpHandler;
modules.proxy = require('./proxy-conn').create(deps, config);
modules.tls = require('./tls').create(deps, config, modules);
modules.http = require('./http').create(deps, config, modules);
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deps.tunnel = deps.tunnel || {};
deps.tunnel.net = {
createConnection: function (opts, cb) {
console.log('[gl.tunnel] creating connection');
// here "reader" means the socket that looks like the connection being accepted
// here "writer" means the remote-looking part of the socket that driving the connection
var writer;
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var wrapOpts = {};
function usePair(err, reader) {
if (err) {
process.nextTick(function () {
writer.emit('error', err);
});
return;
}
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// this has the normal net/tcp stuff plus our custom stuff
// opts = { address, port,
// hostname, servername, tls, encrypted, data, localAddress, localPort, remoteAddress, remotePort, remoteFamily }
Object.keys(opts).forEach(function (key) {
wrapOpts[key] = opts[key];
try {
reader[key] = opts[key];
} catch(e) {
// can't set real socket getters, like remoteAddr
}
});
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// A few more extra specialty options
wrapOpts.localAddress = wrapOpts.localAddress || '127.0.0.2'; // TODO use the tunnel's external address
wrapOpts.localPort = wrapOpts.localPort || 'tunnel-0';
try {
reader._remoteAddress = wrapOpts.remoteAddress;
reader._remotePort = wrapOpts.remotePort;
reader._remoteFamily = wrapOpts.remoteFamily;
reader._localAddress = wrapOpts.localAddress;
reader._localPort = wrapOpts.localPort;
reader._localFamily = wrapOpts.localFamily;
} catch(e) {
}
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tcpHandler(reader, wrapOpts);
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process.nextTick(function () {
// this cb will cause the stream to emit its (actually) first data event
// (even though it already gave a peek into that first data chunk)
console.log('[tunnel] callback, data should begin to flow');
cb();
});
}
wrapOpts.firstChunk = opts.data;
wrapOpts.hyperPeek = !!opts.data;
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// We used to use `stream-pair` for non-tls connections, but there are places
// that require properties/functions to be present on the socket that aren't
// present on a JSStream so it caused problems.
writer = require('socket-pair').create(usePair);
return writer;
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}
};
deps.tunnelClients = require('../tunnel-client-manager').create(deps, config);
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function updateListeners() {
var current = listeners.list();
var wanted = config.tcp.bind;
if (!Array.isArray(wanted)) { wanted = []; }
wanted = wanted.map(Number).filter((port) => port > 0 && port < 65356);
var closeProms = current.filter(function (port) {
return wanted.indexOf(port) < 0;
}).map(function (port) {
return listeners.close(port, 1000);
});
// We don't really need to filter here since listening on the same port with the
// same handler function twice is basically a no-op.
var openProms = wanted.map(function (port) {
return listeners.add(port, tcpHandler);
});
return Promise.all(closeProms.concat(openProms));
}
var mainPort;
function updateConf() {
updateListeners().catch(function (err) {
console.error('Error updating TCP listeners to match bind configuration');
console.error(err);
});
var unforwarded = {};
config.tcp.bind.forEach(function (port) {
unforwarded[port] = true;
});
config.tcp.modules.forEach(function (mod) {
if (['forward', 'proxy'].indexOf(mod.type) < 0) {
console.warn('unknown TCP module type specified', JSON.stringify(mod));
}
if (mod.type !== 'forward') { return; }
mod.ports.forEach(function (port) {
if (!unforwarded[port]) {
console.warn('trying to forward TCP port ' + port + ' multiple times or it is unbound');
} else {
delete unforwarded[port];
}
});
});
// Not really sure what we can reasonably do to prevent this. At least not without making
// our configuration validation more complicated.
if (!Object.keys(unforwarded).length) {
console.warn('no bound TCP ports are not being forwarded, admin interface will be inaccessible');
}
// If we are listening on port 443 make that the main port we respond to mDNS queries with
// otherwise choose the lowest number port we are bound to but not forwarding.
if (unforwarded['443']) {
mainPort = 443;
} else {
mainPort = Object.keys(unforwarded).map(Number).sort((a, b) => a - b)[0];
}
}
updateConf();
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var result = {
updateConf
};
Object.defineProperty(result, 'mainPort', {enumerable: true, get: () => mainPort});
return result;
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};