text: /**
  * @description MeshCentral remote desktop multiplexor
  * @author Ylian Saint-Hilaire
  * @copyright Intel Corporation 2018-2022
  * @license Apache-2.0
  * @version v0.0.1
  */
  
  /*jslint node: true */
  /*jshint node: true */
  /*jshint strict:false */
  /*jshint -W097 */
  /*jshint esversion: 6 */
  "use strict";
  
  
  /*
  --- KVM Commands ---
  MNG_KVM_NOP = 0,
  MNG_KVM_KEY = 1,
  MNG_KVM_MOUSE = 2,
  MNG_KVM_MOUSE_CURSOR = 88,
  MNG_KVM_MOUSE_MOVE = 89,
  MNG_KVM_PICTURE = 3,
  MNG_KVM_COPY = 4,
  MNG_KVM_COMPRESSION = 5,
  MNG_KVM_REFRESH = 6,
  MNG_KVM_SCREEN = 7,
  MNG_KVM_PAUSE = 8,
  MNG_TERMTEXT = 9,
  MNG_CTRLALTDEL = 10,
  MNG_KVM_GET_DISPLAYS = 11,
  MNG_KVM_SET_DISPLAY = 12,
  MNG_KVM_FRAME_RATE_TIMER = 13,
  MNG_KVM_INIT_TOUCH = 14,
  MNG_KVM_TOUCH = 15,
  MNG_KVM_CONNECTCOUNT = 16,
  MNG_KVM_MESSAGE = 17,
  MNG_ECHO = 21,
  MNG_JUMBO = 27,
  MNG_GETDIR = 50,
  MNG_FILEMOVE = 51,
  MNG_FILEDELETE = 52,
  MNG_FILECOPY = 53,
  MNG_FILECREATEDIR = 54,
  MNG_FILETRANSFER = 55,
  MNG_FILEUPLOAD = 56,
  MNG_FILESEARCH = 57,
  MNG_FILETRANSFER2 = 58,
  MNG_KVM_DISCONNECT = 59,
  MNG_GETDIR2 = 60,						// Same as MNG_GETDIR but with date/time.
  MNG_FILEUPLOAD2 = 61,					// Used for slot based fast upload.
  MNG_FILEDELETEREC = 62,					// Same as MNG_FILEDELETE but recursive
  MNG_USERCONSENT = 63,					// Used to notify management console of user consent state
  MNG_DEBUG = 64,							// Debug/Logging Message for ILibRemoteLogging
  MNG_ERROR = 65,
  MNG_ENCAPSULATE_AGENT_COMMAND = 70,
  MNG_KVM_DISPLAY_INFO = 82
  */
  
  function CreateDesktopMultiplexor(parent, domain, nodeid, func) {
      var obj = {};
      obj.nodeid = nodeid;
      obj.parent = parent;
      obj.agent = null;                   // Reference to the connection object that is the agent.
      obj.viewers = [];                   // Array of references to all viewers.
      obj.viewersOverflowCount = 0;       // Number of viewers currently in overflow state.
      obj.width = 0;                      // Current width of the display in pixels.
      obj.height = 0;                     // Current height of the display in pixels.
      obj.swidth = 0;                     // Current width of the display in tiles.
      obj.sheight = 0;                    // Current height of the display in tiles.
      obj.screen = null;                  // The main screen, (x * y) --> tile index. Indicates this image is covering each tile on the screen.
      obj.counter = 1;                    // The main counter, used as index for the obj.images table when now images come in.
      obj.imagesCount = 0;                // Total number of images in the obj.images table.
      obj.imagesCounters = {};            // Main table of indexes --> tile count, the number of tiles still using this image.
      obj.images = {};                    // Main table of indexes --> image data object.
      obj.lastScreenSizeCmd = null;       // Pointer to the last screen size command from the agent.
      obj.lastScreenSizeCounter = 0;      // Index into the image table of the screen size command, this is generally also the first command.
      obj.lastConsoleMessage = null;      // Last agent console message.
      obj.firstData = null;               // Index in the image table of the first image in the table, generally this points to the display resolution command.
      obj.lastData = null;                // Index in the images table of the last image in the table.
      obj.lastDisplayInfoData = null;     // Pointer to the last display information command from the agent (Number of displays).
      obj.lastDisplayLocationData = null; // Pointer to the last display location and size command from the agent.
      obj.desktopPaused = true;           // Current desktop pause state, it's true if all viewers are paused.
      obj.imageType = 1;                  // Current image type, 1 = JPEG, 2 = PNG, 3 = TIFF, 4 = WebP
      obj.imageCompression = 50;          // Current image compression, this is the highest value of all viewers.
      obj.imageScaling = 1024;            // Current image scaling, this is the highest value of all viewers.
      obj.imageFrameRate = 50;            // Current framerate setting, this is the lowest values of all viewers.
      obj.protocolOptions = null;         // Set to the protocol options of the first viewer that connected.
      obj.viewerConnected = false;        // Set to true if one viewer attempted to connect to the agent.
      obj.recordingFile = null;           // Present if we are recording to file.
      obj.recordingFileSize = 0;          // Current size of the recording file.
      obj.recordingFileWriting = false;   // Set to true is we are in the process if writing to the recording file.
      obj.startTime = null;               // Starting time of the multiplex session.
      obj.userIds = [];                   // List of userid's that have intertracted with this session.
      //obj.autoLock = false;               // Automatically lock the remote device once disconnected
  
      // Accounting
      parent.trafficStats.desktopMultiplex.sessions++;
  
      // Add an agent or viewer
      obj.addPeer = function (peer) {
          if (obj.viewers == null) { parent.parent.debug('relay', 'DesktopRelay: Error, addingPeer on disposed session'); return; }
          if (peer.req == null) return; // This peer is already disposed, don't add it.
          if (peer.req.query.browser) {
              //console.log('addPeer-viewer', obj.nodeid);
                          
              // Setup the viewer
              if (obj.viewers.indexOf(peer) >= 0) return true;
              obj.viewers.push(peer);
              peer.desktopPaused = true;
              peer.imageType = 1;
              peer.imageCompression = 30;
              peer.imageScaling = 1024;
              peer.imageFrameRate = 100;
              peer.lastImageNumberSent = null;
              peer.dataPtr = obj.firstData;
              peer.sending = false;
              peer.overflow = false;
              peer.sendQueue = [];
              peer.paused = false;
              peer.startTime = Date.now();
  
              // Add the user to the userids list if needed
              if ((peer.user != null) && (obj.userIds.indexOf(peer.user._id) == -1)) { obj.userIds.push(peer.user._id); }
  
              // Setup slow relay is requested. This will show down sending any data to this viewer.
              if ((peer.req.query.slowrelay != null)) {
                  var sr = null;
                  try { sr = parseInt(peer.req.query.slowrelay); } catch (ex) { }
                  if ((typeof sr == 'number') && (sr > 0) && (sr < 1000)) { peer.slowRelay = sr; }
              }
  
              // Update user last access time
              if ((peer.user != null) && (peer.guestName == null)) {
                  const user = parent.users[peer.user._id];
                  if (user != null) {
                      const timeNow = Math.floor(Date.now() / 1000);
                      if (user.access < (timeNow - 300)) { // Only update user access time if longer than 5 minutes
                          user.access = timeNow;
                          parent.db.SetUser(user);
  
                          // Event the change
                          var message = { etype: 'user', userid: user._id, username: user.name, account: parent.CloneSafeUser(user), action: 'accountchange', domain: domain.id, nolog: 1 };
                          if (parent.db.changeStream) { message.noact = 1; } // If DB change stream is active, don't use this event to change the user. Another event will come.
                          var targets = ['*', 'server-users', user._id];
                          if (user.groups) { for (var i in user.groups) { targets.push('server-users:' + i); } }
                          parent.parent.DispatchEvent(targets, obj, message);
                      }
                  }
              }
  
              // Check session recording
              var startRecord = false;
              if (typeof domain.sessionrecording == 'object') {
                  // Check if this user is set to record all sessions
                  if ((domain.sessionrecording.onlyselectedusers === true) && (peer.user != null) && (peer.user.flags != null) && ((peer.user.flags & 2) != 0)) { startRecord = true; }
                  else if (domain.sessionrecording.onlyselectedusergroups === true) {
                      // Check if there is a usergroup that requires recording of the session
                      var user = null;
                      if (peer.user != null) { user = parent.users[peer.user._id]; }
                      if ((user != null) && (user.links != null) && (user.links[obj.meshid] == null) && (user.links[obj.nodeid] == null)) {
                          // This user does not have a direct link to the device group or device. Find all user groups the would cause the link.
                          for (var i in user.links) {
                              var ugrp = parent.userGroups[i];
                              if ((ugrp != null) && (typeof ugrp.flags == 'number') && ((ugrp.flags & 2) != 0) && (ugrp.links != null) && ((ugrp.links[obj.meshid] != null) || (ugrp.links[obj.nodeid] != null))) { startRecord = true; }
                          }
                      }
                  }
              }
  
              startRecording(domain, startRecord, function () {
                  // Indicated we are connected
                  obj.sendToViewer(peer, obj.recordingFile ? 'cr' : 'c');
  
                  // If the agent sent display information or console message, send it to the viewer
                  if (obj.lastDisplayInfoData != null) { obj.sendToViewer(peer, obj.lastDisplayInfoData); }
                  if (obj.lastDisplayLocationData != null) { obj.sendToViewer(peer, obj.lastDisplayLocationData); }
                  if (obj.lastConsoleMessage != null) { obj.sendToViewer(peer, obj.lastConsoleMessage); }
  
                  // Log joining the multiplex session
                  if (obj.startTime != null) {
                      var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, userid: peer.user ? peer.user._id : null, username: peer.user.name, msgid: 4, msg: "Joined desktop multiplex session", protocol: 2 };
                      parent.parent.DispatchEvent(['*', obj.nodeid, peer.user._id, obj.meshid], obj, event);
                  }
  
                  // Send an updated list of all peers to all viewers
                  obj.sendSessionMetadata();
              });
          } else {
              //console.log('addPeer-agent', obj.nodeid);
              if (obj.agent != null) { parent.parent.debug('relay', 'DesktopRelay: Error, duplicate agent connection'); return false; }
              
              // Setup the agent
              obj.agent = peer;
              peer.sending = false;
              peer.overflow = false;
              peer.sendQueue = [];
              peer.paused = false;
  
              // Indicated we are connected and send connection options and protocol if needed
              obj.sendToAgent(obj.recordingFile?'cr':'c');
              if (obj.viewerConnected == true) {
                  if (obj.protocolOptions != null) { obj.sendToAgent(JSON.stringify(obj.protocolOptions)); } // Send connection options
                  obj.sendToAgent('2'); // Send remote desktop connect
              }
          }
  
          // Log multiplex session start
          if ((obj.agent != null) && (obj.viewers.length > 0) && (obj.startTime == null)) {
              var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, msgid: 6, msg: "Started desktop multiplex session", protocol: 2 };
              if (obj.viewers[0].user != null) { event.userid = obj.viewers[0].user._id; event.username = obj.viewers[0].user.name; }
              const targets = ['*', obj.nodeid, obj.meshid];
              if (obj.viewers[0].user != null) { targets.push(obj.viewers[0].user._id); }
              parent.parent.DispatchEvent(targets, obj, event);
              obj.startTime = Date.now();
          }
          return true;
      }
  
      // Remove an agent or viewer
      // Return true if this multiplexor is no longer needed.
      obj.removePeer = function (peer) {
          if (obj.viewers == null) return;
          if (peer == obj.agent) {
              //console.log('removePeer-agent', obj.nodeid);
              // Agent has disconnected, disconnect everyone.
              if (obj.viewers != null) { for (var i in obj.viewers) { obj.viewers[i].close(); } }
  
              // Clean up the agent
              obj.agent = null;
  
              dispose();
              return true;
          } else {
              //console.log('removePeer-viewer', obj.nodeid);
              // Remove a viewer
              if (obj.viewers != null) {
                  var i = obj.viewers.indexOf(peer);
                  if (i == -1) return false;
                  obj.viewers.splice(i, 1);
              }
  
              // Resume flow control if this was the peer that was limiting traffic (because it was the fastest one).
              if (peer.overflow == true) {
                  obj.viewersOverflowCount--;
                  peer.overflow = false;
                  if ((obj.viewersOverflowCount < obj.viewers.length) && (obj.recordingFileWriting == false) && obj.agent && (obj.agent.paused == true)) { obj.agent.paused = false; obj.agent.ws._socket.resume(); }
              }
  
              // Log leaving the multiplex session
              if (obj.startTime != null) { // Used to check if the agent has connected. If not, don't log this event since the session never really started.
                  // In this code, we want to compute the share of in/out traffic that belongs to this viewer. It includes all of the viewers in/out traffic + all or a portion of the agents in/out traffic.
                  // The agent traffic needs to get divided out between the viewers fairly. For the time that multiple viewers are present, the agent traffic is divided between the viewers.
  
                  // Compute traffic to and from the browser
                  var inTraffc, outTraffc;
                  try { inTraffc = peer.ws._socket.bytesRead; } catch (ex) { }
                  try { outTraffc = peer.ws._socket.bytesWritten; } catch (ex) { }
  
                  // Add any previous agent traffic accounting
                  if (peer.agentInTraffic) { inTraffc += peer.agentInTraffic; }
                  if (peer.outTraffc) { inTraffc += peer.agentOutTraffic; }
  
                  // Compute traffic to and from the agent
                  if (obj.agent != null) {
                      // Get unaccounted bytes from/to the agent
                      var agentInTraffc, agentOutTraffc, agentInTraffc2, agentOutTraffc2;
                      try { agentInTraffc = agentInTraffc2 = obj.agent.ws._socket.bytesRead; } catch (ex) { }
                      try { agentOutTraffc = agentOutTraffc2 = obj.agent.ws._socket.bytesWritten; } catch (ex) { }
                      if (obj.agent.accountedBytesRead) { agentInTraffc -= obj.agent.accountedBytesRead; }
                      if (obj.agent.accountedBytesWritten) { agentOutTraffc -= obj.agent.accountedBytesWritten; }
                      obj.agent.accountedBytesRead = agentInTraffc2;
                      obj.agent.accountedBytesWritten = agentOutTraffc2;
  
                      // Devide up the agent traffic amoung the viewers
                      var viewerPartIn = Math.floor(agentInTraffc / (obj.viewers.length + 1));
                      var viewerPartOut = Math.floor(agentOutTraffc / (obj.viewers.length + 1));
  
                      // Add the portion to this viewer and all other viewer
                      inTraffc += viewerPartIn;
                      outTraffc += viewerPartOut;
                      for (var i in obj.viewers) {
                          if (obj.viewers[i].agentInTraffic) { obj.viewers[i].agentInTraffic += viewerPartIn; } else { obj.viewers[i].agentInTraffic = viewerPartIn; }
                          if (obj.viewers[i].agentOutTraffic) { obj.viewers[i].agentOutTraffic += viewerPartOut; } else { obj.viewers[i].agentOutTraffic = viewerPartOut; }
                      }
                  }
  
                  //var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, userid: peer.user._id, username: peer.user.name, msgid: 5, msg: "Left the desktop multiplex session", protocol: 2 };
                  const sessionSeconds = Math.floor((Date.now() - peer.startTime) / 1000);
                  var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, msgid: 122, msgArgs: [sessionSeconds], msg: "Left the desktop multiplex session after " + sessionSeconds + " second(s).", protocol: 2, bytesin: inTraffc, bytesout: outTraffc };
                  if (peer.user != null) { event.userid = peer.user._id; event.username = peer.user.name; }
                  if (peer.guestName) { event.guestname = peer.guestName; }
                  const targets = ['*', obj.nodeid, obj.meshid];
                  if (peer.user != null) { targets.push(peer.user._id); }
                  parent.parent.DispatchEvent(targets, obj, event);
              }
  
              // Aggressive clean up of the viewer
              delete peer.desktopPaused;
              delete peer.imageType;
              delete peer.imageCompression;
              delete peer.imageScaling;
              delete peer.imageFrameRate;
              delete peer.lastImageNumberSent;
              delete peer.dataPtr;
              delete peer.sending;
              delete peer.overflow;
              delete peer.sendQueue;
              delete peer.startTime;
  
              // If this is the last viewer, disconnect the agent
              if ((obj.viewers != null) && (obj.viewers.length == 0) && (obj.agent != null)) { obj.agent.close(); dispose(); return true; }
  
              // Send an updated list of all peers to all viewers
              obj.sendSessionMetadata();
          }
          return false;
      }
  
      // Clean up ourselves
      function dispose() {
          if (obj.viewers == null) return;
          //console.log('dispose', obj.nodeid);
          delete obj.viewers;
          delete obj.imagesCounters;
          delete obj.images;
  
          // Close the recording file if needed
          if (obj.recordingFile != null) {
              // Compute session length
              if (obj.startTime != null) { obj.sessionStart = obj.startTime; obj.sessionLength = Math.round((Date.now() - obj.startTime) / 1000); }
  
              // Write the last record of the recording file
              var rf = obj.recordingFile;
              delete obj.recordingFile;
              recordingEntry(rf.fd, 3, 0, 'MeshCentralMCREC', function (fd, filename) {
                  parent.parent.fs.close(fd);
  
                  // Now that the recording file is closed, check if we need to index this file.
                  if (domain.sessionrecording.index !== false) { parent.parent.certificateOperations.acceleratorPerformOperation('indexMcRec', filename); }
  
                  // Add a event entry about this recording
                  var basefile = parent.parent.path.basename(filename);
                  var event = { etype: 'relay', action: 'recording', domain: domain.id, nodeid: obj.nodeid, msgid: 7, msgArgs: [obj.sessionLength], msg: "Finished recording session" + (obj.sessionLength ? (', ' + obj.sessionLength + ' second(s)') : ''), filename: basefile, size: obj.recordingFileSize, protocol: 2, icon: obj.icon, name: obj.name, meshid: obj.meshid, userids: obj.userIds, multiplex: true };
                  var mesh = parent.meshes[obj.meshid];
                  if (mesh != null) { event.meshname = mesh.name; }
                  if (obj.sessionStart) { event.startTime = obj.sessionStart; event.lengthTime = obj.sessionLength; }
                  parent.parent.DispatchEvent(['*', 'recording', obj.nodeid, obj.meshid], obj, event);
  
                  cleanUpRecordings();
              }, rf.filename);
          }
  
          // Log end of multiplex session
          if (obj.startTime != null) {
              var event = { etype: 'relay', action: 'relaylog', domain: domain.id, nodeid: obj.nodeid, msgid: 8, msgArgs: [Math.floor((Date.now() - obj.startTime) / 1000)], msg: "Closed desktop multiplex session" + ', ' + Math.floor((Date.now() - obj.startTime) / 1000) + ' second(s)', protocol: 2 };
              parent.parent.DispatchEvent(['*', obj.nodeid, obj.meshid], obj, event);
              obj.startTime = null;
          }
  
          // Send an updated list of all peers to all viewers
          obj.sendSessionMetadata();
  
          parent.parent.debug('relay', 'DesktopRelay: Disposing desktop multiplexor');
      }
  
      // Send data to the agent or queue it up for sending
      obj.sendToAgent = function (data) {
          if ((obj.viewers == null) || (obj.agent == null)) return;
          //console.log('SendToAgent', data.length);
          if (obj.agent.sending) {
              obj.agent.sendQueue.push(data);
  
              // Flow control, pause all viewers is the queue is backing up
              if (obj.agent.sendQueue > 10) {
                  obj.agent.overflow = true;
                  for (var i in obj.viewers) {
                      var v = obj.viewers[i];
                      if (v.paused == false) { v.paused = true; v.ws._socket.pause(); }
                  }
              }
          } else {
              obj.agent.ws.send(data, sendAgentNext);
          }
      }
  
      // Send more data to the agent
      function sendAgentNext() {
          if ((obj.viewers == null) || (obj.agent == null)) return;
          if (obj.agent.sendQueue.length > 0) {
              // Send from the pending send queue
              obj.agent.ws.send(obj.agent.sendQueue.shift(), sendAgentNext);
          } else {
              // Nothing to send
              obj.agent.sending = false;
  
              // Flow control, resume all viewers
              if (obj.agent.overflow == true) {
                  obj.agent.overflow = false;
                  for (var i in obj.viewers) {
                      var v = obj.viewers[i];
                      if (v.paused == true) { v.paused = false; v.ws._socket.resume(); }
                  }
              }
          }
      }
  
      // Send the list of all users currently vieweing this session to all viewers and servers
      obj.sendSessionMetadata = function () {
          var allUsers = {};
          if (obj.viewers != null) {
              for (var i in obj.viewers) {
                  var v = obj.viewers[i];
                  if ((v.user != null) && (v.user._id != null)) {
                      var id = v.user._id;
                      if (v.guestName) { id += '/guest:' + Buffer.from(v.guestName).toString('base64'); } // If this is a guest connect, add the Base64 guest name.
                      if (allUsers[id] == null) { allUsers[id] = 1; } else { allUsers[id]++; }
                  }
              }
              obj.sendToAllViewers(JSON.stringify({ type: 'metadata', 'ctrlChannel': '102938', users: allUsers, startTime: obj.startTime }));
          }
  
          // Update the sessions attached the to agent
          if (obj.nodeid != null) {
              const xagent = parent.wsagents[obj.nodeid];
              if (xagent != null) {
                  if (xagent.sessions == null) { xagent.sessions = {}; }
                  xagent.sessions.multidesk = allUsers;
                  xagent.updateSessions();
              }
          }
      }
  
      // Send this command to all viewers
      obj.sendToAllViewers = function (data) {
          if (obj.viewers == null) return;
          for (var i in obj.viewers) { obj.sendToViewer(obj.viewers[i], data); }
      }
  
      // Send this command to all viewers
      obj.sendToAllInputViewers = function (data) {
          if (obj.viewers == null) return;
          for (var i in obj.viewers) { if (obj.viewers[i].viewOnly != true) { obj.sendToViewer(obj.viewers[i], data); } }
      }
  
      // Send data to the viewer or queue it up for sending
      obj.sendToViewer = function (viewer, data) {
          if ((viewer == null) || (obj.viewers == null)) return;
          //console.log('SendToViewer', data.length);
          if (viewer.sending) {
              viewer.sendQueue.push(data);
          } else {
              viewer.sending = true;
              if (viewer.slowRelay) {
                  setTimeout(function () { try { viewer.ws.send(data, function () { sendViewerNext(viewer); }); } catch (ex) { } }, viewer.slowRelay);
              } else {
                  try { viewer.ws.send(data, function () { sendViewerNext(viewer); }); } catch (ex) { }
              }
  
              // Flow control, pause the agent if needed
              checkViewerOverflow(viewer);
          }
      }
  
      // Check if a viewer is in overflow situation
      function checkViewerOverflow(viewer) {
          if ((viewer.overflow == true) || (obj.viewers == null)) return;
          if ((viewer.sendQueue.length > 5) || ((viewer.dataPtr != null) && (viewer.dataPtr != obj.lastData))) {
              viewer.overflow = true;
              obj.viewersOverflowCount++;
              if ((obj.viewersOverflowCount >= obj.viewers.length) && obj.agent && (obj.agent.paused == false)) { obj.agent.paused = true; obj.agent.ws._socket.pause(); }
          }
      }
  
      // Check if a viewer is in underflow situation
      function checkViewerUnderflow(viewer) {
          if ((viewer.overflow == false) || (obj.viewers == null)) return;
          if ((viewer.sendQueue.length <= 5) && ((viewer.dataPtr == null) || (viewer.dataPtr == obj.lastData))) {
              viewer.overflow = false;
              obj.viewersOverflowCount--;
              if ((obj.viewersOverflowCount < obj.viewers.length) && (obj.recordingFileWriting == false) && obj.agent && (obj.agent.paused == true)) { obj.agent.paused = false; obj.agent.ws._socket.resume(); }
          }
      }
  
      // Send more data to the viewer
      function sendViewerNext(viewer) {
          if ((viewer.sendQueue == null) || (obj.viewers == null)) return;
          if (viewer.sendQueue.length > 0) {
              // Send from the pending send queue
              if (viewer.sending == false) { viewer.sending = true; }
              if (viewer.slowRelay) {
                  setTimeout(function () { try { viewer.ws.send(viewer.sendQueue.shift(), function () { sendViewerNext(viewer); }); } catch (ex) { } }, viewer.slowRelay);
              } else {
                  try { viewer.ws.send(viewer.sendQueue.shift(), function () { sendViewerNext(viewer); }); } catch (ex) { }
              }
              checkViewerOverflow(viewer);
          } else {
              if (viewer.dataPtr != null) {
                  // Send the next image
                  //if ((viewer.lastImageNumberSent != null) && ((viewer.lastImageNumberSent + 1) != (viewer.dataPtr))) { console.log('SVIEW-S1', viewer.lastImageNumberSent, viewer.dataPtr); } // DEBUG
                  var image = obj.images[viewer.dataPtr];
                  viewer.lastImageNumberSent = viewer.dataPtr;
                  //if ((image.next != null) && ((viewer.dataPtr + 1) != image.next)) { console.log('SVIEW-S2', viewer.dataPtr, image.next); } // DEBUG
                  viewer.dataPtr = image.next;
                  if (viewer.slowRelay) {
                      setTimeout(function () { try { viewer.ws.send(image.data, function () { sendViewerNext(viewer); }); } catch (ex) { } }, viewer.slowRelay);
                  } else {
                      try { viewer.ws.send(image.data, function () { sendViewerNext(viewer); }); } catch (ex) { }
                  }
  
                  // Flow control, pause the agent if needed
                  if (viewer.sending == false) { viewer.sending = true; }
                  checkViewerOverflow(viewer);
              } else {
                  // Nothing to send
                  viewer.sending = false;
  
                  // Flow control, resume agent if needed
                  checkViewerUnderflow(viewer);
              }
          }
      }
  
      // Process data coming from the agent or any viewers
      obj.processData = function (peer, data) {
          if (obj.viewers == null) return;
          if (peer == obj.agent) {
              obj.recordingFileWriting = true;
              recordData(true, data, function () {
                  if (obj.viewers == null) return;
                  obj.recordingFileWriting = false;
                  if ((obj.viewersOverflowCount < obj.viewers.length) && obj.agent && (obj.agent.paused == true)) { obj.agent.paused = false; obj.agent.ws._socket.resume(); }
                  obj.processAgentData(data);
              });
          } else {
              obj.processViewerData(peer, data);
          }
      }
  
      // Process incoming viewer data
      obj.processViewerData = function (viewer, data) {
          if (typeof data == 'string') {
              if (data == '2') {
                  if (obj.viewerConnected == false) {
                      if (obj.agent != null) {
                          if (obj.protocolOptions != null) { obj.sendToAgent(JSON.stringify(obj.protocolOptions)); } // Send connection options
                          obj.sendToAgent('2'); // Send remote desktop connect
                      }
                      obj.viewerConnected = true;
                  }
                  return;
              }
              var json = null;
              try { json = JSON.parse(data); } catch (ex) { }
              if (json == null) return;
              if ((json.type == 'options') && (obj.protocolOptions == null)) { obj.protocolOptions = json; }
              if (json.ctrlChannel == '102938') {
                  if ((json.type == 'lock') && (viewer.viewOnly == false)) { obj.sendToAgent('{"ctrlChannel":"102938","type":"lock"}'); } // Account lock support
                  if ((json.type == 'autolock') && (viewer.viewOnly == false) && (typeof json.value == 'boolean')) { obj.sendToAgent('{"ctrlChannel":"102938","type":"autolock","value":' + json.value + '}'); } // Lock on disconnect
              }
              return;
          }
  
          //console.log('ViewerData', data.length, typeof data, data);
          if ((typeof data != 'object') || (data.length < 4)) return; // Ignore all control traffic for now (WebRTC)
          var command = data.readUInt16BE(0);
          var cmdsize = data.readUInt16BE(2);
          if (data.length != cmdsize) return; // Invalid command length
  
          //console.log('ViewerData', data.length, command, cmdsize);
          switch (command) {
              case 1: // Key Events, forward to agent
                  if (viewer.viewOnly == false) { obj.sendToAgent(data); }
                  break;
              case 2: // Mouse events, forward to agent
                  if (viewer.viewOnly == false) { obj.sendToAgent(data); }
                  break;
              case 5: // Compression
                  if (data.length < 10) return;
                  viewer.imageType = data[4]; // Image type: 1 = JPEG, 2 = PNG, 3 = TIFF, 4 = WebP
                  viewer.imageCompression = data[5];
                  viewer.imageScaling = data.readUInt16BE(6);
                  viewer.imageFrameRate = data.readUInt16BE(8);
                  //console.log('Viewer-Compression', viewer.imageType, viewer.imageCompression, viewer.imageScaling, viewer.imageFrameRate);
                  
                  // See if this changes anything
                  var viewersimageType = null;
                  var viewersimageCompression = null;
                  var viewersimageScaling = null;
                  var viewersimageFrameRate = null;
                  for (var i in obj.viewers) {
                      if (viewersimageType == null) { viewersimageType = obj.viewers[i].imageType; } else if (obj.viewers[i].imageType != viewersimageType) { viewersimageType = 1; }; // Default to JPEG if viewers has different image formats
                      if ((viewersimageCompression == null) || (obj.viewers[i].imageCompression > viewersimageCompression)) { viewersimageCompression = obj.viewers[i].imageCompression; };
                      if ((viewersimageScaling == null) || (obj.viewers[i].imageScaling > viewersimageScaling)) { viewersimageScaling = obj.viewers[i].imageScaling; };
                      if ((viewersimageFrameRate == null) || (obj.viewers[i].imageFrameRate < viewersimageFrameRate)) { viewersimageFrameRate = obj.viewers[i].imageFrameRate; };
                  }
                  if ((obj.imageCompression != viewersimageCompression) || (obj.imageScaling != viewersimageScaling) || (obj.imageFrameRate != viewersimageFrameRate)) {
                      // Update and send to agent new compression settings
                      obj.imageType = viewersimageType;
                      obj.imageCompression = viewersimageCompression;
                      obj.imageScaling = viewersimageScaling;
                      obj.imageFrameRate = viewersimageFrameRate
                      //console.log('Send-Agent-Compression', obj.imageType, obj.imageCompression, obj.imageScaling, obj.imageFrameRate);
                      var cmd = Buffer.alloc(10);
                      cmd.writeUInt16BE(5, 0); // Command 5, compression
                      cmd.writeUInt16BE(10, 2); // Command size, 10 bytes long
                      cmd[4] = obj.imageType; // Image type: 1 = JPEG, 2 = PNG, 3 = TIFF, 4 = WebP
                      cmd[5] = obj.imageCompression; // Image compression level
                      cmd.writeUInt16BE(obj.imageScaling, 6); // Scaling level
                      cmd.writeUInt16BE(obj.imageFrameRate, 8); // Frame rate timer
                      obj.sendToAgent(cmd);
                  }
                  break;
              case 6: // Refresh, handle this on the server
                  //console.log('Viewer-Refresh');
                  viewer.dataPtr = obj.firstData; // Start over
                  if (viewer.sending == false) { sendViewerNext(viewer); }
                  break;
              case 8: // Pause and unpause
                  if (data.length != 5) break;
                  var pause = data[4]; // 0 = Unpause, 1 = Pause
                  if (viewer.desktopPaused == (pause == 1)) break;
                  viewer.desktopPaused = (pause == 1);
                  //console.log('Viewer-' + ((pause == 1)?'Pause':'UnPause'));
                  var viewersPaused = true;
                  for (var i in obj.viewers) { if (obj.viewers[i].desktopPaused == false) { viewersPaused = false; }; }
                  if (viewersPaused != obj.desktopPaused) {
                      obj.desktopPaused = viewersPaused;
                      //console.log('Send-Agent-' + ((viewersPaused == true) ? 'Pause' : 'UnPause'));
                      data[4] = (viewersPaused == true) ? 1 : 0;
                      obj.sendToAgent(data);
                  }
                  break;
              case 10: // CTRL-ALT-DEL, forward to agent
                  if (viewer.viewOnly == false) { obj.sendToAgent(data); }
                  break;
              case 12: // SET DISPLAY, forward to agent
                  if (viewer.viewOnly == false) { obj.sendToAgent(data); }
                  break;
              case 14: // Touch setup
                  break;
              case 82: // Request display information
                  if (obj.lastDisplayLocationData != null) { obj.sendToAgent(obj.lastDisplayLocationData); }
                  break;
              case 85: // Unicode Key Events, forward to agent
                  if (viewer.viewOnly == false) { obj.sendToAgent(data); }
                  break;
              case 87: // Remote input lock, forward to agent
                  if (viewer.viewOnly == false) { obj.sendToAgent(data); }
                  break;
              default:
                  console.log('Un-handled viewer command: ' + command);
                  break;
          }
      }
  
      // Process incoming agent data
      obj.processAgentData = function (data) {
          if ((typeof data != 'object') || (data.length < 4)) {
              if (typeof data == 'string') {
                  var json = null;
                  try { json = JSON.parse(data); } catch (ex) { }
                  if (json == null) return;
                  if (json.type == 'console') {
                      // This is a console message, store it and forward this to all viewers
                      if (json.msg != null) { obj.lastConsoleMessage = data; } else { obj.lastConsoleMessage = null; }
                      obj.sendToAllViewers(data);
                  }
                  // All other control messages (notably WebRTC), are ignored for now.
              }
              return; // Ignore all other traffic
          }
          const jumboData = data;
          var command = data.readUInt16BE(0);
          var cmdsize = data.readUInt16BE(2);
          //console.log('AgentData', data.length, command, cmdsize);
          if ((command == 27) && (cmdsize == 8)) {
              // Jumbo packet
              if (data.length >= 12) {
                  command = data.readUInt16BE(8);
                  cmdsize = data.readUInt32BE(4);
                  if (data.length == (cmdsize + 8)) {
                      data = data.slice(8, data.length);
                  } else {
                      console.log('TODO-PARTIAL-JUMBO', command, cmdsize, data.length);
                      return; // TODO
                  }
              }
          }
              
          switch (command) {
              case 3: // Tile, check dimentions and store
                  if ((data.length < 10) || (obj.lastData == null)) break;
                  var x = data.readUInt16BE(4), y = data.readUInt16BE(6);
                  var dimensions = require('image-size')(data.slice(8));
                  var sx = (x / 16), sy = (y / 16), sw = (dimensions.width / 16), sh = (dimensions.height / 16);
                  obj.counter++;
                  
                  // Keep a reference to this image & how many tiles it covers
                  obj.images[obj.counter] = { next: null, prev: obj.lastData, data: jumboData };
                  obj.images[obj.lastData].next = obj.counter;
                  obj.lastData = obj.counter;
                  obj.imagesCounters[obj.counter] = (sw * sh);
                  obj.imagesCount++;
                  if (obj.imagesCount == 2000000000) { obj.imagesCount = 1; } // Loop the counter if needed
  
                  //console.log('Adding Image ' + obj.counter, x, y, dimensions.width, dimensions.height);
  
                  // Update the screen with the correct pointers.
                  for (var i = 0; i < sw; i++) {
                      for (var j = 0; j < sh; j++) {
                          var k = ((obj.swidth * (j + sy)) + (i + sx));
                          const oi = obj.screen[k];
                          obj.screen[k] = obj.counter;
                          if ((oi != null) && (--obj.imagesCounters[oi] == 0)) {
                              // Remove data from the link list
                              obj.imagesCount--;
                              var d = obj.images[oi];
                              //console.log('Removing Image', oi, obj.images[oi].prev, obj.images[oi].next);
                              obj.images[d.prev].next = d.next;
                              obj.images[d.next].prev = d.prev;
                              delete obj.images[oi];
                              delete obj.imagesCounters[oi];
  
                              // If any viewers are currently on image "oi" must be moved to "d.next"
                              for (var l in obj.viewers) { const v = obj.viewers[l]; if (v.dataPtr == oi) { v.dataPtr = d.next; } }
                          }
                      }
                  }
  
                  // Any viewer on dataPtr null, change to this image
                  for (var i in obj.viewers) {
                      const v = obj.viewers[i];
                      if (v.dataPtr == null) { v.dataPtr = obj.counter; if (v.sending == false) { sendViewerNext(v); } }
                  }
  
                  // Debug, display the link list
                  //var xx = '', xptr = obj.firstData;
                  //while (xptr != null) { xx += '>' + xptr; xptr = obj.images[xptr].next; }
                  //console.log('list', xx);
                  //console.log('images', obj.imagesCount);
                  
                  break;
              case 4: // Tile Copy, do nothing.
                  break;
              case 7: // Screen Size, clear the screen state and compute the tile count
                  if (data.length < 8) break;
                  if ((obj.width === data.readUInt16BE(4)) && (obj.height === data.readUInt16BE(6))) break; // Same screen size as before, skip this.
                  obj.counter++;
                  obj.lastScreenSizeCmd = data;
                  obj.lastScreenSizeCounter = obj.counter;
                  obj.width = data.readUInt16BE(4);
                  obj.height = data.readUInt16BE(6);
                  obj.swidth = obj.width / 16;
                  obj.sheight = obj.height / 16;
                  if (Math.floor(obj.swidth) != obj.swidth) { obj.swidth = Math.floor(obj.swidth) + 1; }
                  if (Math.floor(obj.sheight) != obj.sheight) { obj.sheight = Math.floor(obj.sheight) + 1; }
                  
                  // Reset the display
                  obj.screen = new Array(obj.swidth * obj.sheight);
                  obj.imagesCount = 0;
                  obj.imagesCounters = {};
                  obj.images = {};
                  obj.images[obj.counter] = { next: null, prev: null, data: data };
                  obj.firstData = obj.counter;
                  obj.lastData = obj.counter;
                  
                  // Add viewers must be set to start at "obj.counter"
                  for (var i in obj.viewers) {
                      const v = obj.viewers[i];
                      v.dataPtr = obj.counter;
                      if (v.sending == false) { sendViewerNext(v); }
                  }
  
                  //console.log("ScreenSize", obj.width, obj.height, obj.swidth, obj.sheight, obj.swidth * obj.sheight);
                  break;
              case 11: // GetDisplays
                  // Store and send this to all viewers right away
                  obj.lastDisplayInfoData = data;
                  obj.sendToAllInputViewers(data);
                  break;
              case 12: // SetDisplay
                  obj.sendToAllInputViewers(data);
                  break;
              case 14: // KVM_INIT_TOUCH
                  break;
              case 15: // KVM_TOUCH
                  break;
              case 16: // MNG_KVM_CONNECTCOUNT
                  break;
              case 17: // MNG_KVM_MESSAGE
                  // Send this to all viewers right away
                  obj.sendToAllViewers(data);
                  break;
              case 65: // Alert
                  // Send this to all viewers right away
                  obj.sendToAllViewers(data);
                  break;
              case 82:
                  // Display information
                  if ((data.length < 14) || (((data.length - 4) % 10) != 0)) break; // Command must be 14 bytes and have header + 10 byte for each display.
                  obj.lastDisplayLocationData = data;
                  obj.sendToAllInputViewers(data);
                  break;
              case 87: // MNG_KVM_INPUT_LOCK
                  // Send this to all viewers right away
                  // This will update all views on the current state of the input lock
                  obj.sendToAllInputViewers(data);
                  break;
              case 88: // MNG_KVM_MOUSE_CURSOR
                  // Send this to all viewers right away
                  obj.sendToAllInputViewers(data);
                  break;
              default:
                  console.log('Un-handled agent command: ' + command + ', length: ' + cmdsize);
                  break;
          }
      }
  
      function startRecording(domain, start, func) {
          if ((obj.pendingRecording == 1) || (obj.recordingFile != null)) { func(true); return; } // Check if already recording
          if (start == false) { func(false); return; } // Just skip this
          obj.pendingRecording = 1;
          var now = new Date(Date.now());
          var recFilename = 'desktopSession' + ((domain.id == '') ? '' : '-') + domain.id + '-' + now.getUTCFullYear() + '-' + parent.common.zeroPad(now.getUTCMonth() + 1, 2) + '-' + parent.common.zeroPad(now.getUTCDate(), 2) + '-' + parent.common.zeroPad(now.getUTCHours(), 2) + '-' + parent.common.zeroPad(now.getUTCMinutes(), 2) + '-' + parent.common.zeroPad(now.getUTCSeconds(), 2) + '-' + obj.nodeid.split('/')[2] + '.mcrec'
          var recFullFilename = null;
          if (domain.sessionrecording.filepath) {
              try { parent.parent.fs.mkdirSync(domain.sessionrecording.filepath); } catch (e) { }
              recFullFilename = parent.parent.path.join(domain.sessionrecording.filepath, recFilename);
          } else {
              try { parent.parent.fs.mkdirSync(parent.parent.recordpath); } catch (e) { }
              recFullFilename = parent.parent.path.join(parent.parent.recordpath, recFilename);
          }
          parent.parent.fs.open(recFullFilename, 'w', function (err, fd) {
              delete obj.pendingRecording;
              if (err != null) {
                  parent.parent.debug('relay', 'Relay: Unable to record to file: ' + recFullFilename);
                  func(false);
                  return;
              }
              // Write the recording file header
              parent.parent.debug('relay', 'Relay: Started recoding to file: ' + recFullFilename);
              var metadata = { magic: 'MeshCentralRelaySession', ver: 1, nodeid: obj.nodeid, meshid: obj.meshid, time: new Date().toLocaleString(), protocol: 2, devicename: obj.name, devicegroup: obj.meshname };
              var firstBlock = JSON.stringify(metadata);
              recordingEntry(fd, 1, 0, firstBlock, function () {
                  obj.recordingFile = { fd: fd, filename: recFullFilename };
                  obj.recordingFileWriting = false;
                  func(true);
              });
          });
      }
  
      // Here, we check if we have to record the device, regardless of what user is looking at it.
      function recordingSetup(domain, func) {
          var record = false;
  
          // Setup session recording
          if (((domain.sessionrecording == true) || ((typeof domain.sessionrecording == 'object') && ((domain.sessionrecording.protocols == null) || (domain.sessionrecording.protocols.indexOf(2) >= 0))))) {
              record = true;
  
              // Check again to make sure we need to start recording
              if ((typeof domain.sessionrecording == 'object') && ((domain.sessionrecording.onlyselecteddevicegroups === true) || (domain.sessionrecording.onlyselectedusergroups === true) || (domain.sessionrecording.onlyselectedusers === true))) {
                  record = false;
  
                  // Check device group recording
                  if (domain.sessionrecording.onlyselecteddevicegroups === true) {
                      var mesh = parent.meshes[obj.meshid];
                      if ((mesh.flags != null) && ((mesh.flags & 4) != 0)) { record = true; }
                  }
              }
          }
          startRecording(domain, record, func);
      }
  
      // Record data to the recording file
      function recordData(isAgent, data, func) {
          try {
              if (obj.recordingFile != null) {
                  // Write data to recording file
                  recordingEntry(obj.recordingFile.fd, 2, (isAgent ? 0 : 2), data, function () { func(data); });
              } else {
                  func(data);
              }
          } catch (ex) { console.log(ex); }
      }
  
      // Record a new entry in a recording log
      function recordingEntry(fd, type, flags, data, func, tag) {
          try {
              if (typeof data == 'string') {
                  // String write
                  var blockData = Buffer.from(data), header = Buffer.alloc(16); // Header: Type (2) + Flags (2) + Size(4) + Time(8)
                  header.writeInt16BE(type, 0); // Type (1 = Header, 2 = Network Data)
                  header.writeInt16BE(flags, 2); // Flags (1 = Binary, 2 = User)
                  header.writeInt32BE(blockData.length, 4); // Size
                  header.writeIntBE(new Date(), 10, 6); // Time
                  var block = Buffer.concat([header, blockData]);
                  parent.parent.fs.write(fd, block, 0, block.length, function () { func(fd, tag); });
                  obj.recordingFileSize += block.length;
              } else {
                  // Binary write
                  var header = Buffer.alloc(16); // Header: Type (2) + Flags (2) + Size(4) + Time(8)
                  header.writeInt16BE(type, 0); // Type (1 = Header, 2 = Network Data)
                  header.writeInt16BE(flags | 1, 2); // Flags (1 = Binary, 2 = User)
                  header.writeInt32BE(data.length, 4); // Size
                  header.writeIntBE(new Date(), 10, 6); // Time
                  var block = Buffer.concat([header, data]);
                  parent.parent.fs.write(fd, block, 0, block.length, function () { func(fd, tag); });
                  obj.recordingFileSize += block.length;
              }
          } catch (ex) { console.log(ex); func(fd, tag); }
      }
  
      // If there is a recording quota, remove any old recordings if needed
      function cleanUpRecordings() {
          if ((parent.cleanUpRecordingsActive !== true) && domain.sessionrecording && ((typeof domain.sessionrecording.maxrecordings == 'number') || (typeof domain.sessionrecording.maxrecordingsizemegabytes == 'number') || (typeof domain.sessionrecording.maxrecordingdays == 'number'))) {
              parent.cleanUpRecordingsActive = true;
              setTimeout(function () {
                  var recPath = null, fs = require('fs'), now = Date.now();
                  if (domain.sessionrecording.filepath) { recPath = domain.sessionrecording.filepath; } else { recPath = parent.parent.recordpath; }
                  fs.readdir(recPath, function (err, files) {
                      if ((err != null) || (files == null)) { delete parent.cleanUpRecordingsActive; return; }
                      var recfiles = [];
                      for (var i in files) {
                          if (files[i].endsWith('.mcrec')) {
                              var j = files[i].indexOf('-');
                              if (j > 0) {
                                  var stats = null;
                                  try { stats = fs.statSync(parent.parent.path.join(recPath, files[i])); } catch (ex) { }
                                  if (stats != null) { recfiles.push({ n: files[i], r: files[i].substring(j + 1), s: stats.size, t: stats.mtimeMs }); }
                              }
                          }
                      }
                      recfiles.sort(function (a, b) { if (a.r < b.r) return 1; if (a.r > b.r) return -1; return 0; });
                      var totalFiles = 0, totalSize = 0;
                      for (var i in recfiles) {
                          var overQuota = false;
                          if ((typeof domain.sessionrecording.maxrecordings == 'number') && (domain.sessionrecording.maxrecordings > 0) && (totalFiles >= domain.sessionrecording.maxrecordings)) { overQuota = true; }
                          else if ((typeof domain.sessionrecording.maxrecordingsizemegabytes == 'number') && (domain.sessionrecording.maxrecordingsizemegabytes > 0) && (totalSize >= (domain.sessionrecording.maxrecordingsizemegabytes * 1048576))) { overQuota = true; }
                          else if ((typeof domain.sessionrecording.maxrecordingdays == 'number') && (domain.sessionrecording.maxrecordingdays > 0) && (((now - recfiles[i].t) / 1000 / 60 / 60 / 24) >= domain.sessionrecording.maxrecordingdays)) { overQuota = true; }
                          if (overQuota) { fs.unlinkSync(parent.parent.path.join(recPath, recfiles[i].n)); }
                          totalFiles++;
                          totalSize += recfiles[i].s;
                      }
                      delete parent.cleanUpRecordingsActive;
                  });
              }, 500);
          }
      }
  
      // Get node information
      parent.db.Get(nodeid, function (err, nodes) {
          if ((err != null) || (nodes.length != 1)) { func(null); return; }
          obj.meshid = nodes[0].meshid;
          obj.icon = nodes[0].icon;
          obj.name = nodes[0].name;
          recordingSetup(domain, function () { func(obj); });
      });
      return obj;
  }
  
  function checkDeviceSharePublicIdentifier(parent, domain, nodeid, pid, extraKey, func) {
      // Check the public id
      parent.db.GetAllTypeNodeFiltered([nodeid], domain.id, 'deviceshare', null, function (err, docs) {
          if ((err != null) || (docs.length == 0)) { func(false); return; }
  
          // Search for the device share public identifier
          var found = false;
          for (var i = 0; i < docs.length; i++) { if ((docs[i].publicid == pid) && ((docs[i].extrakey == null) || (docs[i].extrakey === extraKey))) { found = true; } }
          func(found);
      });
  }
  
  module.exports.CreateMeshRelay = function (parent, ws, req, domain, user, cookie) {
      if ((cookie != null) && (typeof cookie.nid == 'string') && (typeof cookie.pid == 'string')) {
          checkDeviceSharePublicIdentifier(parent, domain, cookie.nid, cookie.pid, cookie.k, function (result) {
              // If the identifier if not found, close the connection
              if (result == false) { try { ws.close(); } catch (e) { } return; }
              // Public device sharing identifier found, continue as normal.
              CreateMeshRelayEx(parent, ws, req, domain, user, cookie);
          });
      } else {
          CreateMeshRelayEx(parent, ws, req, domain, user, cookie);
      }
  }
  
  // If we are in multi-server mode, the desktop multiplexor needs to be created on the server with the agent connected to it.
  // So, if the agent is connected to a different server, just relay the connection to that server
  function CreateMeshRelayEx(parent, ws, req, domain, user, cookie) {
      // Do validation work
      if (cookie) {
          if ((typeof cookie.expire == 'number') && (cookie.expire <= Date.now())) { delete req.query.nodeid; }
          else if (typeof cookie.nid == 'string') { req.query.nodeid = cookie.nid; }
      }
      if ((req.query.nodeid == null) || (req.query.p != '2') || (req.query.id == null) || (domain == null)) { try { ws.close(); } catch (e) { } return; } // Not is not a valid remote desktop connection.
  
      // Check routing if in multi-server mode
      var nodeid = req.query.nodeid;
      if (parent.parent.multiServer != null) {
          const routing = parent.parent.GetRoutingServerIdNotSelf(nodeid, 1); // 1 = MeshAgent routing type
          if (routing == null) {
              // No need to relay the connection to a different server
              return CreateMeshRelayEx2(parent, ws, req, domain, user, cookie);
          } else {
              // We must relay the connection to a different server
              return parent.parent.multiServer.createPeerRelay(ws, req, routing.serverid, req.session.userid);
          }
      } else {
          // No need to relay the connection to a different server
          return CreateMeshRelayEx2(parent, ws, req, domain, user, cookie);
      }
  }
  
  function CreateMeshRelayEx2(parent, ws, req, domain, user, cookie) {
      const currentTime = Date.now();
      var obj = {};
      obj.ws = ws;
      obj.ws.me = obj;
      obj.id = req.query.id;
      obj.nodeid = req.query.nodeid;
      obj.user = user;
      obj.ruserid = null;
      obj.req = req; // Used in multi-server.js
      obj.viewOnly = ((cookie != null) && (cookie.vo == 1)); // set view only mode
      if ((cookie != null) && (cookie.nouser == 1)) { obj.nouser = true; } // This is a relay without user authentication
  
      // If the domain has remote desktop viewonly set, force everyone to be in viewonly mode.
      if ((typeof domain.desktop == 'object') && (domain.desktop.viewonly == true)) { obj.viewOnly = true; }
  
      // Setup traffic accounting
      if (parent.trafficStats.desktopMultiplex == null) { parent.trafficStats.desktopMultiplex = { connections: 1, sessions: 0, in: 0, out: 0 }; } else { parent.trafficStats.desktopMultiplex.connections++; }
      ws._socket.bytesReadEx = 0;
      ws._socket.bytesWrittenEx = 0;
  
      // Setup subscription for desktop sharing public identifier
      // If the identifier is removed, drop the connection
      if ((cookie != null) && (typeof cookie.pid == 'string')) {
          obj.pid = cookie.pid;
          obj.guestName = cookie.gn;
          parent.parent.AddEventDispatch([obj.nodeid], obj);
          obj.HandleEvent = function (source, event, ids, id) { if ((event.action == 'removedDeviceShare') && (obj.pid == event.publicid)) { obj.close(); } }
      }
  
      // Check relay authentication
      if ((user == null) && (obj.req.query != null) && (obj.req.query.rauth != null)) {
          const rcookie = parent.parent.decodeCookie(obj.req.query.rauth, parent.parent.loginCookieEncryptionKey, 240); // Cookie with 4 hour timeout
          if (rcookie.ruserid != null) { obj.ruserid = rcookie.ruserid; } else if (rcookie.nouser === 1) { obj.rnouser = true; }
          if (rcookie.nodeid != null) { obj.nodeid = rcookie.nodeid; }
      }
  
      // If there is no authentication, drop this connection
      if ((obj.id != null) && (obj.user == null) && (obj.ruserid == null) && (obj.nouser !== true) && (obj.rnouser !== true)) { try { ws.close(); parent.parent.debug('relay', 'DesktopRelay: Connection with no authentication (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } return; }
  
      // Relay session count (we may remove this in the future)
      obj.relaySessionCounted = true;
      parent.relaySessionCount++;
  
      // Mesh Rights
      const MESHRIGHT_EDITMESH = 1;
      const MESHRIGHT_MANAGEUSERS = 2;
      const MESHRIGHT_MANAGECOMPUTERS = 4;
      const MESHRIGHT_REMOTECONTROL = 8;
      const MESHRIGHT_AGENTCONSOLE = 16;
      const MESHRIGHT_SERVERFILES = 32;
      const MESHRIGHT_WAKEDEVICE = 64;
      const MESHRIGHT_SETNOTES = 128;
      const MESHRIGHT_REMOTEVIEW = 256;
  
      // Site rights
      const SITERIGHT_SERVERBACKUP = 1;
      const SITERIGHT_MANAGEUSERS = 2;
      const SITERIGHT_SERVERRESTORE = 4;
      const SITERIGHT_FILEACCESS = 8;
      const SITERIGHT_SERVERUPDATE = 16;
      const SITERIGHT_LOCKED = 32;
  
      // Clean a IPv6 address that encodes a IPv4 address
      function cleanRemoteAddr(addr) { if (addr.startsWith('::ffff:')) { return addr.substring(7); } else { return addr; } }
  
      // Disconnect this agent
      obj.close = function (arg) {
          if (obj.ws == null) return; // Already closed.
  
          // Close the connection
          if ((arg == 1) || (arg == null)) { try { ws.close(); parent.parent.debug('relay', 'DesktopRelay: Soft disconnect (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } } // Soft close, close the websocket
          if (arg == 2) { try { ws._socket._parent.end(); parent.parent.debug('relay', 'DesktopRelay: Hard disconnect (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
          if (obj.relaySessionCounted) { parent.relaySessionCount--; delete obj.relaySessionCounted; }
          if ((obj.deskMultiplexor != null) && (typeof obj.deskMultiplexor == 'object') && (obj.deskMultiplexor.removePeer(obj) == true)) { delete parent.desktoprelays[obj.nodeid]; }
  
          // Aggressive cleanup
          delete obj.id;
          delete obj.ws;
          delete obj.req;
          delete obj.user;
          delete obj.nodeid;
          delete obj.ruserid;
          delete obj.expireTimer;
          delete obj.deskMultiplexor;
  
          // Clear timers if present
          if (obj.pingtimer != null) { clearInterval(obj.pingtimer); delete obj.pingtimer; }
          if (obj.pongtimer != null) { clearInterval(obj.pongtimer); delete obj.pongtimer; }
  
          // Unsubscribe
          if (obj.pid != null) { parent.parent.RemoveAllEventDispatch(obj); }
      };
  
      obj.sendAgentMessage = function (command, userid, domainid) {
          var rights, mesh;
          if (command.nodeid == null) return false;
          var user = null;
          if (userid != null) { user = parent.users[userid]; if (user == null) return false; }
          var splitnodeid = command.nodeid.split('/');
          // Check that we are in the same domain and the user has rights over this node.
          if ((splitnodeid[0] == 'node') && (splitnodeid[1] == domainid)) {
              // Get the user object
              // See if the node is connected
              var agent = parent.wsagents[command.nodeid];
              if (agent != null) {
                  // Check if we have permission to send a message to that node
                  if (userid == null) { rights = MESHRIGHT_REMOTECONTROL; } else { rights = parent.GetNodeRights(user, agent.dbMeshKey, agent.dbNodeKey); }
                  mesh = parent.meshes[agent.dbMeshKey];
                  if ((rights != null) && (mesh != null) || ((rights & 16) != 0)) { // TODO: 16 is console permission, may need more gradular permission checking
                      if (ws.sessionId) { command.sessionid = ws.sessionId; }   // Set the session id, required for responses.
                      command.rights = rights;            // Add user rights flags to the message
                      if ((command.rights != 0xFFFFFFFF) && ((command.rights & 0x100) != 0)) { command.rights -= 0x100; } // Since the multiplexor will enforce view-only, remove MESHRIGHT_REMOTEVIEWONLY
                      if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent
                      if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags
                      if (user != null) {
                          command.username = user.name;       // Add user name
                          command.realname = user.realname;   // Add real name
                      }
                      if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text
                      delete command.nodeid;              // Remove the nodeid since it's implyed.
                      agent.send(JSON.stringify(command));
                      return true;
                  }
              } else {
                  // Check if a peer server is connected to this agent
                  var routing = parent.parent.GetRoutingServerIdNotSelf(command.nodeid, 1); // 1 = MeshAgent routing type
                  if (routing != null) {
                      // Check if we have permission to send a message to that node
                      if (userid == null) { rights = MESHRIGHT_REMOTECONTROL; } else { rights = parent.GetNodeRights(user, routing.meshid, command.nodeid); }
                      mesh = parent.meshes[routing.meshid];
                      if (rights != null || ((rights & 16) != 0)) { // TODO: 16 is console permission, may need more gradular permission checking
                          if (ws.sessionId) { command.fromSessionid = ws.sessionId; }   // Set the session id, required for responses.
                          command.rights = rights;                // Add user rights flags to the message
                          if ((command.rights != 0xFFFFFFFF) && ((command.rights & 0x00000100) != 0)) { command.rights -= 0x00000100; } // Since the multiplexor will enforce view-only, remove MESHRIGHT_REMOTEVIEWONLY
                          if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent
                          if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags
                          if (user != null) {
                              command.username = user.name;           // Add user name
                              command.realname = user.realname;       // Add real name
                          }
                          if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text
                          parent.parent.multiServer.DispatchMessageSingleServer(command, routing.serverid);
                          return true;
                      }
                  }
              }
          }
          return false;
      };
  
      // Send a PING/PONG message
      function sendPing() {
          try { obj.ws.send('{"ctrlChannel":"102938","type":"ping"}'); } catch (ex) { }
          try { if (obj.peer != null) { obj.peer.ws.send('{"ctrlChannel":"102938","type":"ping"}'); } } catch (ex) { }
      }
      function sendPong() {
          try { obj.ws.send('{"ctrlChannel":"102938","type":"pong"}'); } catch (ex) { }
          try { if (obj.peer != null) { obj.peer.ws.send('{"ctrlChannel":"102938","type":"pong"}'); } } catch (ex) { }
      }
  
      function performRelay(retryCount) {
          if ((obj.id == null) || (retryCount > 20)) { try { obj.close(); } catch (e) { } return null; } // Attempt to connect without id, drop this.
          if (retryCount == 0) { ws._socket.setKeepAlive(true, 240000); } // Set TCP keep alive
  
          /*
          // Validate that the id is valid, we only need to do this on non-authenticated sessions.
          // TODO: Figure out when this needs to be done.
          if (user == null) {
              // Check the identifier, if running without TLS, skip this.
              var ids = obj.id.split(':');
              if (ids.length != 3) { ws.close(); delete obj.id; return null; } // Invalid ID, drop this.
              if (parent.crypto.createHmac('SHA384', parent.relayRandom).update(ids[0] + ':' + ids[1]).digest('hex') != ids[2]) { ws.close(); delete obj.id; return null; } // Invalid HMAC, drop this.
              if ((Date.now() - parseInt(ids[1])) > 120000) { ws.close(); delete obj.id; return null; } // Expired time, drop this.
              obj.id = ids[0];
          }
          */
  
          if (retryCount == 0) {
              // Setup the agent PING/PONG timers
              if ((typeof parent.parent.args.agentping == 'number') && (obj.pingtimer == null)) { obj.pingtimer = setInterval(sendPing, parent.parent.args.agentping * 1000); }
              else if ((typeof parent.parent.args.agentpong == 'number') && (obj.pongtimer == null)) { obj.pongtimer = setInterval(sendPong, parent.parent.args.agentpong * 1000); }
  
              parent.parent.debug('relay', 'DesktopRelay: Connection (' + obj.req.clientIp + ')');
          }
  
          // Create if needed and add this peer to the desktop multiplexor
          obj.deskMultiplexor = parent.desktoprelays[obj.nodeid];
          if (obj.deskMultiplexor == null) {
              parent.desktoprelays[obj.nodeid] = 1; // Indicate that the creating of the desktop multiplexor is pending.
              parent.parent.debug('relay', 'DesktopRelay: Creating new desktop multiplexor');
              CreateDesktopMultiplexor(parent, domain, obj.nodeid, function (deskMultiplexor) {
                  if (deskMultiplexor != null) {
                      // Desktop multiplexor was created, use it.
                      obj.deskMultiplexor = deskMultiplexor;
                      parent.desktoprelays[obj.nodeid] = obj.deskMultiplexor;
                      obj.deskMultiplexor.addPeer(obj);
                      ws._socket.resume(); // Release the traffic
                  } else {
                      // An error has occured, close this connection
                      delete parent.desktoprelays[obj.nodeid];
                      ws.close();
                  }
              });
          } else {
              if (obj.deskMultiplexor == 1) {
                  // The multiplexor is being created, hold a little and try again. This is to prevent a possible race condition.
                  setTimeout(function () { performRelay(++retryCount); }, 50);
              } else {
                  // Hook up this peer to the multiplexor and release the traffic
                  obj.deskMultiplexor.addPeer(obj);
                  ws._socket.resume();
              }
          }
      }
  
      // When data is received from the mesh relay web socket
      ws.on('message', function (data) {
          // Data accounting
          parent.trafficStats.desktopMultiplex.in += (this._socket.bytesRead - this._socket.bytesReadEx);
          parent.trafficStats.desktopMultiplex.out += (this._socket.bytesWritten - this._socket.bytesWrittenEx);
          this._socket.bytesReadEx = this._socket.bytesRead;
          this._socket.bytesWrittenEx = this._socket.bytesWritten;
  
          // If this data was received by the agent, decode it.
          if (this.me.deskMultiplexor != null) { this.me.deskMultiplexor.processData(this.me, data); }
      });
  
      // If error, close both sides of the relay.
      ws.on('error', function (err) {
          //console.log('ws-error', err);
          parent.relaySessionErrorCount++;
          console.log('Relay error from ' + obj.req.clientIp + ', ' + err.toString().split('\r')[0] + '.');
          obj.close();
      });
  
      // If the relay web socket is closed, close both sides.
      ws.on('close', function (req) {
          // Data accounting
          parent.trafficStats.desktopMultiplex.in += (this._socket.bytesRead - this._socket.bytesReadEx);
          parent.trafficStats.desktopMultiplex.out += (this._socket.bytesWritten - this._socket.bytesWrittenEx);
          this._socket.bytesReadEx = this._socket.bytesRead;
          this._socket.bytesWrittenEx = this._socket.bytesWritten;
  
          //console.log('ws-close', req);
          obj.close();
      });
  
      // If this session has a expire time, setup the expire timer now.
      setExpireTimer();
  
      // Mark this relay session as authenticated if this is the user end.
      obj.authenticated = ((user != null) || (obj.nouser === true));
      if (obj.authenticated) {
          // Kick off the routing, if we have agent routing instructions, process them here.
          // Routing instructions can only be given by a authenticated user
          if ((cookie != null) && (cookie.nodeid != null) && (cookie.tcpport != null) && (cookie.domainid != null)) {
              // We have routing instructions in the cookie, but first, check user access for this node.
              parent.db.Get(cookie.nodeid, function (err, docs) {
                  if (obj.req == null) return; // This connection was closed.
                  if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket
                  const node = docs[0];
  
                  // Check if this user has permission to manage this computer
                  if ((obj.nouser !== true) && ((parent.GetNodeRights(user, node.meshid, node._id) & MESHRIGHT_REMOTECONTROL) == 0)) { console.log('ERR: Access denied (1)'); try { obj.close(); } catch (e) { } return; }
  
                  // Send connection request to agent
                  const rcookieData = { nodeid: node._id };
                  if (user != null) { rcookieData.ruserid = user._id; } else if (obj.nouser === true) { rcookieData.nouser = 1; }
                  const rcookie = parent.parent.encodeCookie(rcookieData, parent.parent.loginCookieEncryptionKey);
                  if (obj.id == undefined) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one.
                  const command = { nodeid: node._id, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?id=' + obj.id + '&rauth=' + rcookie, tcpport: cookie.tcpport, tcpaddr: cookie.tcpaddr };
                  parent.parent.debug('relay', 'Relay: Sending agent tunnel command: ' + JSON.stringify(command));
                  if (obj.sendAgentMessage(command, user ? user._id : null, cookie.domainid) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); }
                  performRelay(0);
              });
              return obj;
          } else if ((obj.req.query.nodeid != null) && ((obj.req.query.tcpport != null) || (obj.req.query.udpport != null))) {
              // We have routing instructions in the URL arguments, but first, check user access for this node.
              parent.db.Get(obj.req.query.nodeid, function (err, docs) {
                  if (obj.req == null) return; // This connection was closed.
                  if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket
                  const node = docs[0];
  
                  // Check if this user has permission to manage this computer
                  if ((obj.nouser !== true) && ((parent.GetNodeRights(user, node.meshid, node._id) & MESHRIGHT_REMOTECONTROL) == 0)) { console.log('ERR: Access denied (2)'); try { obj.close(); } catch (e) { } return; }
  
                  // Send connection request to agent
                  if (obj.id == null) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one.
                  const rcookieData = { nodeid: node._id };
                  if (user != null) { rcookieData.ruserid = user._id; } else if (obj.nouser === true) { rcookieData.nouser = 1; }
                  const rcookie = parent.parent.encodeCookie(rcookieData, parent.parent.loginCookieEncryptionKey);
  
                  if (obj.req.query.tcpport != null) {
                      const command = { nodeid: node._id, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?id=' + obj.id + '&rauth=' + rcookie, tcpport: obj.req.query.tcpport, tcpaddr: ((obj.req.query.tcpaddr == null) ? '127.0.0.1' : obj.req.query.tcpaddr) };
                      parent.parent.debug('relay', 'Relay: Sending agent TCP tunnel command: ' + JSON.stringify(command));
                      if (obj.sendAgentMessage(command, user ? user._id : null, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); }
                  } else if (obj.req.query.udpport != null) {
                      const command = { nodeid: node._id, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?id=' + obj.id + '&rauth=' + rcookie, udpport: obj.req.query.udpport, udpaddr: ((obj.req.query.udpaddr == null) ? '127.0.0.1' : obj.req.query.udpaddr) };
                      parent.parent.debug('relay', 'Relay: Sending agent UDP tunnel command: ' + JSON.stringify(command));
                      if (obj.sendAgentMessage(command, user ? user._id : null, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); }
                  }
                  performRelay(0);
              });
              return obj;
          } else if ((cookie != null) && (cookie.nid != null) && (typeof cookie.r == 'number') && (typeof cookie.cf == 'number') && (typeof cookie.gn == 'string')) {
              // We have routing instructions in the cookie, but first, check user access for this node.
              parent.db.Get(cookie.nid, function (err, docs) {
                  if (obj.req == null) return; // This connection was closed.
                  if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket
                  const node = docs[0];
  
                  // Check if this user has permission to manage this computer
                  if ((obj.nouser !== true) && ((parent.GetNodeRights(user, node.meshid, node._id) & MESHRIGHT_REMOTECONTROL) == 0)) { console.log('ERR: Access denied (2)'); try { obj.close(); } catch (e) { } return; }
  
                  // Send connection request to agent
                  if (obj.id == null) { obj.id = ('' + Math.random()).substring(2); }
                  const rcookieData = { nodeid: node._id };
                  if (user != null) { rcookieData.ruserid = user._id; } else if (obj.nouser === true) { rcookieData.nouser = 1; }
                  const rcookie = parent.parent.encodeCookie(rcookieData, parent.parent.loginCookieEncryptionKey);
                  const command = { nodeid: node._id, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?p=2&id=' + obj.id + '&rauth=' + rcookie + '&nodeid=' + node._id, soptions: {}, usage: 2, rights: cookie.r, guestname: cookie.gn, consent: cookie.cf, remoteaddr: cleanRemoteAddr(obj.req.clientIp) };
                  if (typeof domain.consentmessages == 'object') {
                      if (typeof domain.consentmessages.title == 'string') { command.soptions.consentTitle = domain.consentmessages.title; }
                      if (typeof domain.consentmessages.desktop == 'string') { command.soptions.consentMsgDesktop = domain.consentmessages.desktop; }
                      if (typeof domain.consentmessages.terminal == 'string') { command.soptions.consentMsgTerminal = domain.consentmessages.terminal; }
                      if (typeof domain.consentmessages.files == 'string') { command.soptions.consentMsgFiles = domain.consentmessages.files; }
                  }
                  if (typeof domain.notificationmessages == 'object') {
                      if (typeof domain.notificationmessages.title == 'string') { command.soptions.notifyTitle = domain.notificationmessages.title; }
                      if (typeof domain.notificationmessages.desktop == 'string') { command.soptions.notifyMsgDesktop = domain.notificationmessages.desktop; }
                      if (typeof domain.notificationmessages.terminal == 'string') { command.soptions.notifyMsgTerminal = domain.notificationmessages.terminal; }
                      if (typeof domain.notificationmessages.files == 'string') { command.soptions.notifyMsgFiles = domain.notificationmessages.files; }
                  }
                  parent.parent.debug('relay', 'Relay: Sending agent tunnel command: ' + JSON.stringify(command));
                  if (obj.sendAgentMessage(command, user ? user._id : null, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'Relay: Unable to contact this agent (' + obj.req.clientIp + ')'); }
  
                  performRelay(0);
              });
              return obj;
          }
      }
  
      // Set the session expire timer
      function setExpireTimer() {
          if (obj.expireTimer != null) { clearTimeout(obj.expireTimer); delete obj.expireTimer; }
          if (cookie && (typeof cookie.expire == 'number')) {
              const timeToExpire = (cookie.expire - Date.now());
              if (timeToExpire < 1) {
                  obj.close();
              } else if (timeToExpire >= 0x7FFFFFFF) {
                  obj.expireTimer = setTimeout(setExpireTimer, 0x7FFFFFFF); // Since expire timer can't be larger than 0x7FFFFFFF, reset timer after that time.
              } else {
                  obj.expireTimer = setTimeout(obj.close, timeToExpire);
              }
          }
      }
  
  
      // Check if this user has input access on the device
      if ((obj.user != null) && (obj.viewOnly == false)) {
          obj.viewOnly = true; // Set a view only for now until we figure out otherwise
          parent.db.Get(obj.nodeid, function (err, docs) {
              if (obj.req == null) return; // This connection was closed.
              if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket
              const node = docs[0];
  
              // Check if this user has permission to manage this computer
              const rights = parent.GetNodeRights(obj.user, node.meshid, node._id);
              if ((rights & 0x00000008) == 0) { try { obj.close(); } catch (e) { } return; } // Check MESHRIGHT_ADMIN or MESHRIGHT_REMOTECONTROL
              if ((rights != 0xFFFFFFFF) && ((rights & 0x00010000) != 0)) { try { obj.close(); } catch (e) { } return; } // Check MESHRIGHT_NODESKTOP
              if ((rights == 0xFFFFFFFF) || ((rights & 0x00000100) == 0)) { obj.viewOnly = false; } // Check MESHRIGHT_REMOTEVIEWONLY
              performRelay(0);
          });
      } else {
          // If this is not an authenticated session, or the session does not have routing instructions, just go ahead an connect to existing session.
          performRelay(0);
      }
      return obj;
  };
  
  /*
  Relay session recording required that "SessionRecording":true be set in the domain section of the config.json.
  Once done, a folder "meshcentral-recordings" will be created next to "meshcentral-data" that will contain all
  of the recording files with the .mcrec extension.
  
  The recording files are binary and contain a set of:
  
      <HEADER><DATABLOCK><HEADER><DATABLOCK><HEADER><DATABLOCK><HEADER><DATABLOCK>...
  
  The header is always 16 bytes long and is encoded like this:
  
      TYPE   2 bytes, 1 = Header, 2 = Network Data, 3 = EndBlock
      FLAGS  2 bytes, 0x0001 = Binary, 0x0002 = User
      SIZE   4 bytes, Size of the data following this header.
      TIME   8 bytes, Time this record was written, number of milliseconds since 1 January, 1970 UTC.
  
  All values are BigEndian encoded. The first data block is of TYPE 1 and contains a JSON string with information
  about this recording. It looks something like this:
  
  {
      magic: 'MeshCentralRelaySession',
      ver: 1,
      userid: "user\domain\userid",
      username: "username",
      sessionid: "RandomValue",
      ipaddr1: 1.2.3.4,
      ipaddr2: 1.2.3.5,
      time: new Date().toLocaleString()
  }
  
  The rest of the data blocks are all network traffic that was relayed thru the server. They are of TYPE 2 and have
  a given size and timestamp. When looking at network traffic the flags are important:
  
  - If traffic has the first (0x0001) flag set, the data is binary otherwise it's a string.
  - If the traffic has the second (0x0002) flag set, traffic is coming from the user's browser, if not, it's coming from the MeshAgent.
  */