| 1 | #!/usr/bin/env node |
| 2 | |
| 3 | import fs from "node:fs"; |
| 4 | import path from "node:path"; |
| 5 | import { fileURLToPath } from "node:url"; |
| 6 | |
| 7 | export const WINDOWS_GUI_SUBSYSTEM = 2; |
| 8 | |
| 9 | export function readPESubsystem(bytes) { |
| 10 | const image = Buffer.isBuffer(bytes) ? bytes : Buffer.from(bytes); |
| 11 | if (image.length < 0x40 || image.toString("ascii", 0, 2) !== "MZ") { |
| 12 | throw new Error("not a valid DOS/PE image"); |
| 13 | } |
| 14 | |
| 15 | const peOffset = image.readUInt32LE(0x3c); |
| 16 | const optionalHeaderOffset = peOffset + 24; |
| 17 | const subsystemOffset = optionalHeaderOffset + 68; |
| 18 | if ( |
| 19 | peOffset > image.length - 24 || |
| 20 | image.toString("binary", peOffset, peOffset + 4) !== "PE\0\0" || |
| 21 | subsystemOffset > image.length - 2 |
| 22 | ) { |
| 23 | throw new Error("not a valid PE image"); |
| 24 | } |
| 25 | |
| 26 | const optionalHeaderSize = image.readUInt16LE(peOffset + 20); |
| 27 | if (optionalHeaderSize < 70 || optionalHeaderOffset + optionalHeaderSize > image.length) { |
| 28 | throw new Error("invalid PE optional header"); |
| 29 | } |
| 30 | const magic = image.readUInt16LE(optionalHeaderOffset); |
| 31 | if (magic !== 0x10b && magic !== 0x20b) { |
| 32 | throw new Error(`unsupported PE optional header magic 0x${magic.toString(16)}`); |
| 33 | } |
| 34 | return image.readUInt16LE(subsystemOffset); |
| 35 | } |
| 36 | |
| 37 | export function verifyWindowsGUISubsystem(file) { |
| 38 | const subsystem = readPESubsystem(fs.readFileSync(file)); |
| 39 | if (subsystem !== WINDOWS_GUI_SUBSYSTEM) { |
| 40 | throw new Error( |
| 41 | `${file}: expected Windows GUI subsystem ${WINDOWS_GUI_SUBSYSTEM}, got ${subsystem}`, |
| 42 | ); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | function main(files) { |
| 47 | if (files.length === 0) { |
| 48 | throw new Error("usage: verify-windows-gui-subsystem.mjs <exe> [exe ...]"); |
| 49 | } |
| 50 | for (const file of files) { |
| 51 | verifyWindowsGUISubsystem(file); |
| 52 | console.log(`${file}: Windows GUI subsystem verified`); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) { |
| 57 | try { |
| 58 | main(process.argv.slice(2)); |
| 59 | } catch (error) { |
| 60 | console.error(error instanceof Error ? error.message : error); |
| 61 | process.exitCode = 1; |
| 62 | } |
| 63 | } |
| 64 |