telebit-relay.js/lib/relay.js

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'use strict';
var Packer = require('proxy-packer');
var Devices = require('./device-tracker');
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var Server = require('./server.js');
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module.exports.store = { Devices: Devices };
module.exports.create = function (state) {
state.deviceLists = { _domains: {}, _devices: {} };
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state.deviceCallbacks = {};
state.srvs = {};
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if (!parseInt(state.activityTimeout, 10)) {
state.activityTimeout = 2 * 60 * 1000;
}
if (!parseInt(state.pongTimeout, 10)) {
state.pongTimeout = 10 * 1000;
}
state.Devices = Devices;
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// TODO Use a Single TCP Handler
// Issues:
// * dynamic ports are dedicated to a device or cluster
// * servernames could come in on ports that belong to a different device
// * servernames could come in that belong to no device
// * this could lead to an attack / security vulnerability with ACME certificates
// Solutions
// * Restrict dynamic ports to a particular device
// * Restrict the use of servernames
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function onWsConnection(_ws, _upgradeReq) {
var srv = {};
var initToken;
srv.ws = _ws;
srv.upgradeReq = _upgradeReq;
// TODO use device's ECDSA thumbprint as device id
srv.id = null;
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srv.socketId = Packer.socketToId(srv.upgradeReq.socket);
srv.grants = {};
srv.clients = {};
srv.domainsMap = {};
srv.portsMap = {};
srv.pausedConns = [];
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srv.domains = [];
srv.ports = [];
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if (state.debug) { console.log('[ws] connection', srv.socketId); }
initToken = Server.parseAuth(state, srv);
srv.ws._socket.on('drain', function () {
// the websocket library has it's own buffer apart from node's socket buffer, but that one
// is much more difficult to watch, so we watch for the lower level buffer to drain and
// then check to see if the upper level buffer is still too full to write to. Note that
// the websocket library buffer has something to do with compression, so I'm not requiring
// that to be 0 before we start up again.
if (srv.ws.bufferedAmount > 128*1024) {
return;
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}
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srv.pausedConns.forEach(function (conn) {
if (!conn.manualPause) {
// console.log('resuming', conn.tunnelCid, 'now that the web socket has caught up');
conn.resume();
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}
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});
srv.pausedConns.length = 0;
});
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if (initToken) {
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console.log('[wss.onConnection] token provided in http headers');
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return Server.addToken(state, srv, initToken).then(function () {
Server.init(state, srv);
}).catch(function (err) {
Server.sendTunnelMsg(srv, null, [0, err], 'control');
srv.ws.close();
});
} else {
return Server.init(state, srv);
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}
}
return {
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tcp: require('./unwrap-tls').createTcpConnectionHandler(state)
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, ws: onWsConnection
, isClientDomain: Devices.exist.bind(null, state.deviceLists)
};
};