CPU Adventure Solve Script (DragonCTF 2019)

client.ts

import { Socket } from "net";
import * as readline from "readline";

const rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout
});

function wait() {
	return new Promise<string>((resolve) => {
		rl.question(">", resolve);
	});
}

let log = true;
let allData = "";
let socket = new Socket();

socket.connect(1234, "cpuadventure.hackable.software");

socket.on("close", () => process.exit(1));

socket.on("data", (data) => {
	allData += data.toString();
});

async function send(data: string) {
	if (log) {
		process.stdout.write("\x1b[34m");
		process.stdout.write(data);
		process.stdout.write("\x1b[0m\n");
	}
	socket.write(data);
}

function readUntil(delim: string) {
	return new Promise<string>((resolve) => {
		let index = allData.indexOf(delim);
		if (index >= 0) {
			let result = allData.substring(0, index + delim.length);
			allData = allData.substring(index + delim.length);
			if (log) {
				process.stdout.write("\x1b[31m");
				process.stdout.write(result);
				process.stdout.write("\x1b[0m\n");
			}
			resolve(result);
		} else {
			socket.once("data", async () => {
				resolve(await readUntil(delim));
			});
		}
	});
}

let makeArray = <T>(n: number, fn: (i: number) => T) => Array.from(new Array(n), (_, i) => fn(i));

let ENEMIES = [
	"VALIS",
	"REDFORD",
	"THE RED BULL",
	"THE YELLOW DRAGON",
	"THE BLUE DRAGON",
	"THE CRYSTAL DRAGON",
	"THE GREEN DRAGON",
	"THE BEIGE DRAGON",
	"THE BLACK DRAGON",
	"THE GRAY DRAGON",
	"THE ORANGE DRAGON",
	"THE RED DRAGON",
	"THE WHITE DRAGON",
	"THE DRUNK DRAGON",
]

// Setup
const EOM = "CHOICE: ";
let grid = makeArray(8, () => makeArray<string | undefined>(8, () => undefined));

function shouldShield() {
	// console.log(stateString.substring(index, index + 50), stateString[index%stateString.length], stateString[(index+1)%stateString.length]);
	return stateString[index%stateString.length] === "0" || stateString[(index+1)%stateString.length] === "1";
}

// dumped from a previous run
let stateString = `0110110100100110011001110010101010011101101000010000010101100100000001111010100000110110011011101100101101110001001000100110000010110001001100111111101111010010001100000111111110110111000111110101110011000111101101001101011111000001011011110001110100111011000000111000100010000011001000100010010001111001111111010001010011100000110110111011011100111111100111011110001000100010011011011100101111111111010111000011101001001100001100111010110111011111001011101011101011111011100011101010100001101010111101101101111000110000111000110000110010010101100010111011100110011000111001101111101001101010111001101011111010100010001010000101000110010000110000111001100100011000010000010010011111111101100110000011101111000011101010110001110010110100100110110011100111101000100101111010011101101010111001000001101111100000110010010111001011101111101101111001110001011000010100011110111000111111111010110010111000011001001111100011110101100100001110001101011000001111011101011110011101111101110000100001111010110000101110010010100111100110100110011000110011001010111001000100111101001000100101010101011010000000010110010001110011110000010100111111011100000111101001010100110010100010011011001001100101011110001011001010101111110011100010011010111101111111001001101101111000011010101101110010001010000111101111000100111011011000101100101111101101100110011110101001100110010011011101011111100011000010110111101001001100100110101111110101100111011001100110010100100110100011111111100001101110110001001010111010101100001001100111101000110000110000111100110110110000000111010000001110010010011101101011101101101011101010010000010110001100110101010101101101010011110001010000001101010000111100000110011000011100001101010011101011101101010100110101110011110010010111111110010101011110110011101110110000001011011010001000100101001010110101110001100100011100010110010000001101001111010011110111101010010001101000110011110010011101011011000101110000110111001101101111111100001010001101110101001011110110111000010100111011011010000101111011100110000111010110011110011011100111011100001011100011010010000101110101000101010101101010101000001101001100101110001001100100000000000100011111110001010011011010111011110000101111100110111101110001000000101010000110010100101001010100000111011000101000000011111010110110010100001110011111101001010010011101110100000010011010011000011101110011101100101100100101100010100011110010010101010111000001010101010010100110000111110110101110001001110001001010100101000011111000010101100101010101010000100101000110111111110111010011001011001000001100000010111001010101110001101011101011101110101001001011111101100011111011010010010110010000110010010000110000010011110001011010101000000000010010000010111011000011111010000011101110111101010101110110111010000010110000110010000000101000011010111010010001111111010000000111001010110011001011111000100100011001100100001000001000011011010100110110110001010011111010001011100010111001110000010011010001101010111010010110000100101100011011101001101010010011111110111000011010011000001000111001001101110000101100100100011100011100110101011101100001010111010100110101100110111000110110100010011100011000001100000000010000000001111010001010100011011001010100111111111100110111111011000010100100001100111011100011110101001110011011001111100000011101010000100001000000111101100101100001111110111100001001010000111011010111110001000010010110011000111110010100010101110110011010110010100010100100010110000110111010010000000001101111000000000010000101011101111001000011011001011011001000000100001110111101110000010100000000000011100100001101001111111001100010101000101001111010111110001101000000011011010000110000110011000001001000111110010110111100100010010001010011101010010011101011110010111011000100000001111111110010011110001100101110111100011110110011001110000000011001001100011110001011101010011111100001110100001100010011011111100011111101101000001010101000111101100100110101010100111001111001110100100000101001001011000010111100011000110110001101011011110010100011010000001100010001011100100010110100110001010000010010111111001101110100010101111001101101001010011011100010100100110110110110101000000110010111000001100000101000010101001101101001000110010110110101111010111111110011111111011100011000000110100101000000101111111110101001111100101110000100111010101100110110111000001011010100101011110111110110000011100111001111101110010100010111011111001110111001000011101100100001111011001110010001010101101111010000110000011001010100001010000110000100110001011101001100010011111111010011101111111110011100000110011101001110100101000100101001111100111011001110011011110000111111111110110100111010001011111101010110000001100001011100001111011010001111110100100011101011101010101111001001101111010001001110100110010011000010110000010010110000111010001100101100111111011111111010010111011010100011001110110111001010101011011111110101001010110111011000110000010111110111011000111010110010100111110110111110010001111000000001101110010100101000000000101101011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let index = -1;

async function fillState() {
	console.log("filling state");
	// log = false;
	let first = true;

	let start = Date.now();
	let stateCnt = 40;
	send("S".repeat(stateCnt));

	let state = "";

	for (let i = 0; i < stateCnt; i++) {
		let result = await readUntil(EOM);
		state += result.indexOf("BOUNC") >= 0 ? "1" : "0";
	}

	index = (stateString + stateString).indexOf(state);

	if (index === -1) {
		console.log("big wat");
		process.exit(1);
	}

	index += state.length;
	console.log("done filling state ->", index);

	// console.log(bounces);
	// log = true;
}

async function doFight() {
	while (true) {
		let result = await readUntil(EOM);
		if (result.indexOf("YOU KILL") >= 0) {
			// Nice!
			return;
		} else {
			if (index === -1) {
				await fillState();
			}
			if (shouldShield()) {
				send("S");
				index++;
			} else {
				send("A");
				index += 2;
			}
		}
	}
}

async function exploreGrid() {
	// assumuption: we start in the tavern

	for (let i = 0; i < 8; i++) {
		for (let j = 0; j < 8; j++) {
			console.log(i, j);
			let result = await readUntil(EOM);

			for (let enemy of ENEMIES) {
				if (result.indexOf(enemy) >= 0) {
					grid[i][j] = enemy;
					break;
				}
			}

			if (grid[i][j] === "THE DRUNK DRAGON") {
				await send("A");
				await readUntil(EOM);
			} else if (grid[i][j] !== undefined && grid[i][j] !== "VALIS") {
				// Fight! Fight! Fight!
				await send("F");
				index = -1;
				await doFight();
			}

			await send("E");
		}

		for (let j = 0; j < 8; j++) {
			await readUntil(EOM);
			await send("W");
		}

		await readUntil(EOM);
		await send("N");
	}

	for (let i = 0; i < 8; i++) {
		await readUntil(EOM);
		await send("S");
	}
}

async function run() {
	await exploreGrid();
	console.log(grid);
	while (true) {
		await send("T");
		await readUntil(EOM);
	}
	// interactive();
}

async function interactive() {
	while (true) {
		await send(await wait());
		await readUntil(EOM);
	}
}

run();

package.json

{
  "devDependencies": {
    "@types/node": "^12.7.5"
  }
}