MeshCentral/mcrec.js

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/**
* @description MeshCentral MeshAgent
* @author Ylian Saint-Hilaire
* @copyright Intel Corporation 2019-2020
* @license Apache-2.0
* @version v0.0.1
*/
var fs = require('fs');
var path = require('path');
var worker = null;
const NodeJSVer = Number(process.version.match(/^v(\d+\.\d+)/)[1]);
var directRun = (require.main === module);
function log() { if (directRun) { console.log(...arguments); } else { if (worker != null) { worker.parentPort.postMessage({ msg: arguments[0] }); } } }
if (directRun && (NodeJSVer >= 12)) { const xworker = require('worker_threads'); try { if (xworker.isMainThread == false) { worker = xworker; } } catch (ex) { log(ex); } }
function start() { startEx(process.argv); }
if (directRun) { setup(); }
function setup() { InstallModules(['image-size'], start); }
function start() { startEx(process.argv); }
function startEx(argv) {
var state = { recFileName: null, recFile: null, recFileSize: 0, recFilePtr: 0 };
var infile = null;
if (argv.length > 2) { infile = argv[2]; } else {
log('MeshCentral Session Recodings Processor');
log('This tool will index a .mcrec file so that the player can seek thru the file.');
log('');
log(' Usage: node mcrec [file]');
return;
}
if (fs.existsSync(infile) == false) { log("Missing file: " + infile); return; }
state.recFileName = infile;
state.recFileSize = fs.statSync(infile).size;
if (state.recFileSize < 32) { log("Invalid file: " + infile); return; }
log("Processing file: " + infile + ", " + state.recFileSize + " bytes.");
state.recFile = fs.openSync(infile, 'r+');
state.indexTime = 10; // Interval between indexes in seconds
state.lastIndex = 0; // Last time an index was writen in seconds
state.indexes = [];
state.width = 0;
state.height = 0;
state.basePtr = null;
readLastBlock(state, function (state, result, time, extras) {
if (result == false) { log("Invalid file: " + infile); return; }
if (extras != null) { log("File already indexed: " + infile); return; }
state.lastTimeStamp = time;
readNextBlock(state, processBlock);
});
}
function createIndex(state, ptr) {
var index = [];
for (var i in state.screen) { if (index.indexOf(state.screen[i]) == -1) { index.push(state.screen[i]); } }
index.sort(function (a, b) { return a - b });
index.unshift(state.height);
index.unshift(state.width);
index.unshift(ptr - state.basePtr);
state.indexes.push(index); // Index = [ Ptr, Width, Height, Block Pointers... ]
//log('Index', state.lastIndex, index.length);
//log('Index', index);
state.lastIndex += 10;
}
function processBlock(state, block) {
if (block == null) { writeIndex(state, function () { log("Done."); }); return; }
var elapseMilliSeconds = 0;
if (state.startTime != null) { elapseMilliSeconds = (block.time - state.startTime); }
var flagBinary = (block.flags & 1) != 0;
var flagUser = (block.flags & 2) != 0;
// Start indexing at the first type 2 block
if ((state.basePtr == null) && (block.type == 2)) { state.basePtr = block.ptr; state.startTime = block.time; }
// Check if we need to create one or more indexes
while (((state.lastIndex + state.indexTime) * 1000) < elapseMilliSeconds) { createIndex(state, block.ptr); }
if (block.type == 1) {
// Metadata
state.metadata = JSON.parse(block.data.toString());
if (state.metadata.indexInterval != null) { log("This file is already indexed."); return; }
if (state.metadata.protocol != 2) { log("Only remote desktop sessions can currently be indexed."); return; }
state.metadataFlags = block.flags;
state.metadataTime = block.time;
state.recFileProtocol = state.metadata.protocol;
state.dataStartPtr = state.recFilePtr;
if (typeof state.recFileProtocol == 'string') { state.recFileProtocol = parseInt(state.recFileProtocol); }
} else if ((block.type == 2) && flagBinary && !flagUser) {
// Device --> User data
if (state.recFileProtocol == 1) {
// MeshCentral Terminal
// TODO
log('Terminal');
} else if (state.recFileProtocol == 2) {
// MeshCentral Remote Desktop
// TODO
if (block.data.length >= 4) {
var command = block.data.readInt16BE(0);
var cmdsize = block.data.readInt16BE(2);
if ((command == 27) && (cmdsize == 8)) {
// Jumbo packet
if (block.data.length >= 12) {
command = block.data.readInt16BE(8);
cmdsize = block.data.readInt32BE(4);
if (block.data.length == (cmdsize + 8)) {
block.data = block.data.slice(8, block.data.length);
} else {
console.log('TODO-PARTIAL-JUMBO', command, cmdsize, block.data.length);
return; // TODO
}
}
}
switch (command) {
case 3: // Tile
var x = block.data.readInt16BE(4);
var y = block.data.readInt16BE(6);
var dimensions = require('image-size')(block.data.slice(8));
//log("Tile", x, y, dimensions.width, dimensions.height, block.ptr);
//console.log(elapseSeconds);
// Update the screen with the correct pointers.
var sx = x/16, sy = y/16, sw = dimensions.width/16, sh = dimensions.height/16;
for (var i = 0; i < sw; i++) {
for (var j = 0; j < sh; j++) {
var k = ((state.swidth * (j + sy)) + (i + sx));
state.screen[k] = (block.ptr - state.basePtr);
}
}
break;
case 4: // Tile copy
var x = block.data.readInt16BE(4);
var y = block.data.readInt16BE(6);
//log("TileCopy", x, y);
break;
case 7: // Screen Size, clear the screen state and computer the tile count
state.width = block.data.readInt16BE(4);
state.height = block.data.readInt16BE(6);
state.swidth = state.width / 16;
state.sheight = state.height / 16;
if (Math.floor(state.swidth) != state.swidth) { state.swidth = Math.floor(state.swidth) + 1; }
if (Math.floor(state.sheight) != state.sheight) { state.sheight = Math.floor(state.sheight) + 1; }
state.screen = {};
//log("ScreenSize", state.width, state.height, state.swidth, state.sheight, state.swidth * state.sheight);
break;
}
//log('Desktop', command, cmdsize);
}
} else if (state.recFileProtocol == 101) {
// Intel AMT KVM
// TODO
log('AMTKVM');
}
} else if ((block.type == 2) && flagBinary && flagUser) {
// User --> Device data
if (state.recFileProtocol == 101) {
// Intel AMT KVM
//if (rstr2hex(data) == '0000000008080001000700070003050200000000') { amtDesktop.bpp = 1; } // Switch to 1 byte per pixel.
}
}
//console.log(block);
readNextBlock(state, processBlock);
}
function writeIndex(state, func) {
// Add the new indexes in extra metadata at the end of the file.
var extraMetadata = {};
extraMetadata.indexInterval = state.indexTime;
extraMetadata.indexStartTime = state.startTime;
extraMetadata.indexes = state.indexes;
recordingEntry(state.recFile, 4, 0, state.lastTimeStamp, JSON.stringify(extraMetadata), function (state) {
recordingEntry(state.recFile, 3, 0, state.recFileSize - 32, 'MeshCentralMCNDX', function (state) {
func(state);
}, state);
}, state, state.recFileSize - 32);
}
// Record a new entry in a recording log
function recordingEntry(fd, type, flags, time, data, func, tag, position) {
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(time, 10, 6); // Time
var block = Buffer.concat([header, blockData]);
if (typeof position == 'number') {
fs.write(fd, block, 0, block.length, position, function () { func(tag); });
} else {
fs.write(fd, block, 0, block.length, function () { func(tag); });
}
} 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(time, 10, 6); // Time
var block = Buffer.concat([header, data]);
if (typeof position == 'number') {
fs.write(fd, block, 0, block.length, position, function () { func(tag); });
} else {
fs.write(fd, block, 0, block.length, function () { func(tag); });
}
}
} catch (ex) { console.log(ex); func(state, tag); }
}
function readLastBlock(state, func) {
var buf = Buffer.alloc(32);
fs.read(state.recFile, buf, 0, 32, state.recFileSize - 32, function (err, bytesRead, buf) {
var type = buf.readInt16BE(0);
var flags = buf.readInt16BE(2);
var size = buf.readInt32BE(4);
var time = (buf.readInt32BE(8) << 32) + buf.readInt32BE(12);
var magic = buf.toString('utf8', 16, 32);
if ((type == 3) && (size == 16) && (magic == 'MeshCentralMCNDX')) {
// Extra metadata present, lets read it.
extraMetadata = null;
var buf2 = Buffer.alloc(16);
fs.read(state.recFile, buf2, 0, 16, time, function (err, bytesRead, buf2) {
var xtype = buf2.readInt16BE(0);
var xflags = buf2.readInt16BE(2);
var xsize = buf2.readInt32BE(4);
var xtime = (buf2.readInt32BE(8) << 32) + buf.readInt32BE(12);
var buf3 = Buffer.alloc(xsize);
fs.read(state.recFile, buf3, 0, xsize, time + 16, function (err, bytesRead, buf3) {
func(state, true, xtime, JSON.parse(buf3.toString()));
});
});
} else {
// No extra metadata or fail
func(state, (type == 3) && (size == 16) && (magic == 'MeshCentralMCREC'), time, null);
}
});
}
function readNextBlock(state, func) {
if ((state.recFilePtr + 16) > state.recFileSize) { func(state, null); return; }
var r = {}, buf = Buffer.alloc(16);
fs.read(state.recFile, buf, 0, 16, state.recFilePtr, function (err, bytesRead, buf) {
r.type = buf.readInt16BE(0);
r.flags = buf.readInt16BE(2);
r.size = buf.readInt32BE(4);
r.time = buf.readIntBE(8, 8);
r.date = new Date(r.time);
r.ptr = state.recFilePtr;
if ((state.recFilePtr + 16 + r.size) > state.recFileSize) { func(state, null); return; }
if (r.size == 0) {
r.data = null;
func(state, r);
} else {
r.data = Buffer.alloc(r.size);
fs.read(state.recFile, r.data, 0, r.size, state.recFilePtr + 16, function (err, bytesRead, buf) {
state.recFilePtr += (16 + r.size);
func(state, r);
});
}
});
}
function isNumber(x) { return (('' + parseInt(x)) === x) || (('' + parseFloat(x)) === x); }
function format(format) { var args = Array.prototype.slice.call(arguments, 1); return format.replace(/{(\d+)}/g, function (match, number) { return typeof args[number] != 'undefined' ? args[number] : match; }); };
// Check if a list of modules are present and install any missing ones
var InstallModuleChildProcess = null;
var previouslyInstalledModules = {};
function InstallModules(modules, func) {
var missingModules = [];
if (previouslyInstalledModules == null) { previouslyInstalledModules = {}; }
if (modules.length > 0) {
for (var i in modules) {
try {
var xxmodule = require(modules[i]);
} catch (e) {
if (previouslyInstalledModules[modules[i]] !== true) { missingModules.push(modules[i]); }
}
}
if (missingModules.length > 0) { InstallModule(missingModules.shift(), InstallModules, modules, func); } else { func(); }
}
}
// Check if a module is present and install it if missing
function InstallModule(modulename, func, tag1, tag2) {
log('Installing ' + modulename + '...');
var child_process = require('child_process');
var parentpath = __dirname;
// Get the working directory
if ((__dirname.endsWith('/node_modules/meshcentral')) || (__dirname.endsWith('\\node_modules\\meshcentral')) || (__dirname.endsWith('/node_modules/meshcentral/')) || (__dirname.endsWith('\\node_modules\\meshcentral\\'))) { parentpath = require('path').join(__dirname, '../..'); }
// Looks like we need to keep a global reference to the child process object for this to work correctly.
InstallModuleChildProcess = child_process.exec('npm install --no-optional --save ' + modulename, { maxBuffer: 512000, timeout: 120000, cwd: parentpath }, function (error, stdout, stderr) {
InstallModuleChildProcess = null;
if ((error != null) && (error != '')) {
log('ERROR: Unable to install required module "' + modulename + '". May not have access to npm, or npm may not have suffisent rights to load the new module. Try "npm install ' + modulename + '" to manualy install this module.\r\n');
process.exit();
return;
}
previouslyInstalledModules[modulename] = true;
func(tag1, tag2);
return;
});
}
// Export table
module.exports.startEx = startEx;