mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2024-09-21 05:47:44 +03:00
236 lines
12 KiB
JavaScript
236 lines
12 KiB
JavaScript
/**
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* @description Mesh Agent Transport Module - using websocket relay
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* @author Ylian Saint-Hilaire
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* @version v0.0.1f
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*/
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// Construct a MeshServer agent direction object
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var CreateAgentRedirect = function (meshserver, module, serverPublicNamePort) {
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var obj = {};
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obj.m = module; // This is the inner module (Terminal or Desktop)
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module.parent = obj;
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obj.meshserver = meshserver;
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obj.State = 0;
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obj.nodeid = null;
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obj.socket = null;
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obj.connectstate = -1;
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obj.tunnelid = Math.random().toString(36).substring(2); // Generate a random client tunnel id
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obj.protocol = module.protocol; // 1 = SOL, 2 = KVM, 3 = IDER, 4 = Files, 5 = FileTransfer
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obj.onStateChanged = null;
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obj.ctrlMsgAllowed = true;
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obj.attemptWebRTC = false;
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obj.webRtcActive = false;
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obj.webSwitchOk = false;
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obj.webchannel = null;
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obj.webrtc = null;
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obj.debugmode = 0;
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// Private method
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//obj.debug = function (msg) { console.log(msg); }
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obj.Start = function (nodeid) {
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var url2, url = window.location.protocol.replace("http", "ws") + "//" + window.location.host + window.location.pathname.substring(0, window.location.pathname.lastIndexOf('/')) + "/meshrelay.ashx?id=" + obj.tunnelid;
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//if (serverPublicNamePort) { url2 = window.location.protocol.replace("http", "ws") + "//" + serverPublicNamePort + "/meshrelay.ashx?id=" + obj.tunnelid; } else { url2 = url; }
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obj.nodeid = nodeid;
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obj.connectstate = 0;
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obj.socket = new WebSocket(url);
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obj.socket.onopen = obj.xxOnSocketConnected;
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obj.socket.onmessage = obj.xxOnMessage;
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obj.socket.onerror = function (e) { console.error(e); }
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obj.socket.onclose = obj.xxOnSocketClosed;
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obj.xxStateChange(1);
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//obj.meshserver.send({ action: 'msg', type: 'tunnel', nodeid: obj.nodeid, value: url2 });
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obj.meshserver.send({ action: 'msg', type: 'tunnel', nodeid: obj.nodeid, value: "*/meshrelay.ashx?id=" + obj.tunnelid });
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//obj.debug("Agent Redir Start: " + url);
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}
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obj.xxOnSocketConnected = function () {
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if (obj.debugmode == 1) { console.log('onSocketConnected'); }
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//obj.debug("Agent Redir Socket Connected");
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obj.xxStateChange(2);
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}
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// Called to pass websocket control messages
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obj.xxOnControlCommand = function (msg) {
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var controlMsg;
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try { controlMsg = JSON.parse(msg); } catch (e) { return; }
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if (controlMsg.ctrlChannel != '102938') { obj.xxOnSocketData(msg); return; }
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//console.log(controlMsg);
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if (obj.webrtc != null) {
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if (controlMsg.type == 'answer') {
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obj.webrtc.setRemoteDescription(new RTCSessionDescription(controlMsg), function () { /*console.log('WebRTC remote ok');*/ }, obj.xxCloseWebRTC);
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} else if (controlMsg.type == 'webrtc0') {
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obj.webSwitchOk = true; // Other side is ready for switch over
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performWebRtcSwitch();
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} else if (controlMsg.type == 'webrtc1') {
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obj.sendCtrlMsg("{\"ctrlChannel\":\"102938\",\"type\":\"webrtc2\"}"); // Confirm we got end of data marker, indicates data will no longer be received on websocket.
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} else if (controlMsg.type == 'webrtc2') {
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// TODO: Resume/Start sending data over WebRTC
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}
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}
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}
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obj.sendCtrlMsg = function (x) { if (obj.ctrlMsgAllowed == true) { if (args && args.redirtrace) { console.log('RedirSend', typeof x, x); } try { obj.socket.send(x); } catch (ex) { } } }
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function performWebRtcSwitch() {
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if ((obj.webSwitchOk == true) && (obj.webRtcActive == true)) {
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obj.sendCtrlMsg("{\"ctrlChannel\":\"102938\",\"type\":\"webrtc0\"}"); // Indicate to the meshagent that it can start traffic switchover
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obj.sendCtrlMsg("{\"ctrlChannel\":\"102938\",\"type\":\"webrtc1\"}"); // Indicate to the meshagent that data traffic will no longer be sent over websocket.
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// TODO: Hold/Stop sending data over websocket
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if (obj.onStateChanged != null) { obj.onStateChanged(obj, obj.State); }
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}
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}
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obj.xxOnMessage = function (e) {
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//console.log('Recv', e.data, obj.State);
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if (obj.State < 3) {
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if (e.data == 'c') {
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try { obj.socket.send(obj.protocol); } catch (ex) { }
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obj.xxStateChange(3);
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if (obj.attemptWebRTC == true) {
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// Try to get WebRTC setup
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var configuration = null; //{ "iceServers": [ { 'urls': 'stun:stun.services.mozilla.com' }, { 'urls': 'stun:stun.l.google.com:19302' } ] };
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if (typeof RTCPeerConnection !== 'undefined') { obj.webrtc = new RTCPeerConnection(configuration); }
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else if (typeof webkitRTCPeerConnection !== 'undefined') { obj.webrtc = new webkitRTCPeerConnection(configuration); }
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if (obj.webrtc != null) {
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obj.webchannel = obj.webrtc.createDataChannel("DataChannel", {}); // { ordered: false, maxRetransmits: 2 }
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obj.webchannel.onmessage = function (event) { obj.xxOnMessage({ data: event.data }); };
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obj.webchannel.onopen = function () { obj.webRtcActive = true; performWebRtcSwitch(); };
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obj.webchannel.onclose = function (event) { /*console.log('WebRTC close');*/ if (obj.webRtcActive) { obj.Stop(); } }
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obj.webrtc.onicecandidate = function (e) {
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if (e.candidate == null) {
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try { obj.socket.send(JSON.stringify(obj.webrtcoffer)); } catch (ex) { } // End of candidates, send the offer
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} else {
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obj.webrtcoffer.sdp += ("a=" + e.candidate.candidate + "\r\n"); // New candidate, add it to the SDP
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}
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}
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obj.webrtc.oniceconnectionstatechange = function () {
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if (obj.webrtc != null) {
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if (obj.webrtc.iceConnectionState == 'disconnected') { obj.Stop(); }
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else if (obj.webrtc.iceConnectionState == 'failed') { obj.xxCloseWebRTC(); }
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}
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}
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obj.webrtc.createOffer(function (offer) {
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// Got the offer
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obj.webrtcoffer = offer;
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obj.webrtc.setLocalDescription(offer, function () { /*console.log('WebRTC local ok');*/ }, obj.xxCloseWebRTC);
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}, obj.xxCloseWebRTC, { mandatory: { OfferToReceiveAudio: false, OfferToReceiveVideo: false } });
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}
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}
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return;
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}
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}
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if (typeof e.data == 'string') {
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// Control messages, most likely WebRTC setup
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obj.xxOnControlCommand(e.data);
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return;
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}
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if (typeof e.data == 'object') {
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var f = new FileReader();
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if (f.readAsBinaryString) {
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// Chrome & Firefox (Draft)
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f.onload = function (e) { obj.xxOnSocketData(e.target.result); }
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f.readAsBinaryString(new Blob([e.data]));
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} else if (f.readAsArrayBuffer) {
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// Chrome & Firefox (Spec)
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f.onloadend = function (e) { obj.xxOnSocketData(e.target.result); }
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f.readAsArrayBuffer(e.data);
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} else {
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// IE10, readAsBinaryString does not exist, use an alternative.
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var binary = "";
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var bytes = new Uint8Array(e.data);
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var length = bytes.byteLength;
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for (var i = 0; i < length; i++) { binary += String.fromCharCode(bytes[i]); }
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obj.xxOnSocketData(binary);
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}
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} else {
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// If we get a string object, it maybe the WebRTC confirm. Ignore it.
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obj.xxOnSocketData(e.data);
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}
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};
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obj.xxOnSocketData = function (data) {
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if (!data || obj.connectstate == -1) return;
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if (typeof data === 'object') {
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// This is an ArrayBuffer, convert it to a string array (used in IE)
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var binary = "", bytes = new Uint8Array(data), length = bytes.byteLength;
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for (var i = 0; i < length; i++) { binary += String.fromCharCode(bytes[i]); }
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data = binary;
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}
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else if (typeof data !== 'string') return;
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//console.log("xxOnSocketData", rstr2hex(data));
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if (args && args.redirtrace) { console.log("RedirRecv", typeof data, data.length, data); }
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return obj.m.ProcessData(data);
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}
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obj.sendText = function (x) {
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if (typeof x != 'string') { x = JSON.stringify(x); } // Turn into a string if needed
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obj.send(encode_utf8(x)); // Encode UTF8 correctly
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}
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obj.send = function (x) {
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//obj.debug("Agent Redir Send(" + obj.webRtcActive + ", " + x.length + "): " + rstr2hex(x));
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//console.log("Agent Redir Send(" + obj.webRtcActive + ", " + x.length + "): " + ((typeof x == 'string')?x:rstr2hex(x)));
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if (args && args.redirtrace) { console.log('RedirSend', typeof x, x.length, x); }
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try {
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if (obj.socket != null && obj.socket.readyState == WebSocket.OPEN) {
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if (typeof x == 'string') {
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if (obj.debugmode == 1) {
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var b = new Uint8Array(x.length), c = [];
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for (var i = 0; i < x.length; ++i) { b[i] = x.charCodeAt(i); c.push(x.charCodeAt(i)); }
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if (obj.webRtcActive == true) { obj.webchannel.send(b.buffer); } else { obj.socket.send(b.buffer); }
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//console.log('Send', c);
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} else {
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var b = new Uint8Array(x.length);
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for (var i = 0; i < x.length; ++i) { b[i] = x.charCodeAt(i); }
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if (obj.webRtcActive == true) { obj.webchannel.send(b.buffer); } else { obj.socket.send(b.buffer); }
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}
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} else {
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//if (obj.debugmode == 1) { console.log('Send', x); }
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if (obj.webRtcActive == true) { obj.webchannel.send(x); } else { obj.socket.send(x); }
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}
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}
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} catch (ex) { }
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}
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obj.xxOnSocketClosed = function () {
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//obj.debug("Agent Redir Socket Closed");
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//if (obj.debugmode == 1) { console.log('onSocketClosed'); }
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obj.Stop(1);
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}
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obj.xxStateChange = function(newstate) {
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if (obj.State == newstate) return;
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obj.State = newstate;
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obj.m.xxStateChange(obj.State);
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if (obj.onStateChanged != null) obj.onStateChanged(obj, obj.State);
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}
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// Close the WebRTC connection, should be called if a problem occurs during WebRTC setup.
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obj.xxCloseWebRTC = function () {
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if (obj.webchannel != null) { try { obj.webchannel.close(); } catch (e) { } obj.webchannel = null; }
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if (obj.webrtc != null) { try { obj.webrtc.close(); } catch (e) { } obj.webrtc = null; }
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obj.webRtcActive = false;
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}
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obj.Stop = function (x) {
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if (obj.debugmode == 1) { console.log('stop', x); }
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// Clean up WebRTC
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obj.xxCloseWebRTC();
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//obj.debug("Agent Redir Socket Stopped");
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obj.connectstate = -1;
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if (obj.socket != null) {
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try { if (obj.socket.readyState == 1) { obj.sendCtrlMsg("{\"ctrlChannel\":\"102938\",\"type\":\"close\"}"); obj.socket.close(); } } catch (e) { }
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obj.socket = null;
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}
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obj.xxStateChange(0);
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}
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return obj;
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}
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